ABSORBENT ARTICLE

专利摘要:
absorbent article. The present invention relates to a diaper (1) which, according to an embodiment of the invention, includes an upper lamina (2), a back lamina (3), and a longitudinally long absorbent member (4) disposed between the laminae. (2, 3). the absorbent member (4) includes an absorbent core (41). the absorbent core (41) includes a block pattern region (411) that includes longitudinal grooves (44y) extending in the longitudinal direction (y direction); lateral grooves (44x) extending in the lateral direction (x direction), and a plurality of longitudinally long high basis weight sections (43) disposed in respective sections divided by the longitudinal grooves (44y) and the lateral grooves (44x), each high basis weight section (43) having a higher basis weight than the sections located in the longitudinal grooves (44y) and in the lateral grooves (44x). the high basis weight sections (43) of the absorbent core (41) are formed integrally with the low basis weight sections (44) made up of the sections located in the longitudinal grooves (44y) and the lateral grooves (44x). the lateral groove thickness (44x) is the same as or thinner than the longitudinal groove thickness (44y), and the lateral groove width (44x) is wider than the longitudinal groove width (44y) in a planar view.
公开号:BR112014027238B1
申请号:R112014027238-7
申请日:2013-05-31
公开日:2021-07-20
发明作者:Shigeto Yanagihara；Mina Tomita；Hiromichi Suzuki；Nobuya Sato
申请人:Kao Corporation；
IPC主号:

专利说明:

FIELD OF TECHNIQUE
[001] The present invention relates to an absorbent article such as a disposable diaper. FUNDAMENTALS OF THE INVENTION
[002] Conventionally, absorbent articles have been known which employ standard block absorbent members (absorbent cores) provided with spaces with molded grooves extending in the planar direction (cf. Patent Literature 1). The absorbent article described in Patent Literature 1 includes an absorbent member (absorbent core) having a first region in which the percentage content of polymer absorbent bodies is high and the percentage content of hydrophilic fibers is low; a second region in which the percentage content of polymer absorbent bodies is low and the percentage content of fibrous material is higher than the first region; and spaces that penetrate from the first region, which is provided on the side of an outer surface sheet, to the first region, which is provided on the side of an inner surface sheet. As the absorbent article described in Patent Literature 1 includes such an absorbent member, there are cases where it is possible to effectively prevent gel blocking.
[003] As another technique, the applicant has previously proposed an absorbent article that includes an absorbent member (absorbent core) that is formed by disposing, on a base sheet, a plurality of small absorbent parts that are divided and separated in a planar view (as per Patent Literature 2). Patent Literature 2 describes a technique which makes the distance between longitudinally adjacent small absorbent portions different from laterally adjacent small absorbent portions. Citation List Patent Literature Patent Literature 1: JP 2009-119154-A Patent Literature: 2: JP 2011-136034-A SUMMARY OF THE INVENTION
[004] However, Patent Literature 1 does not describe anything about the relationship between the width of the longitudinally extending space and the width of the laterally extending space, and the absorbent article described in Patent Literature 1 cannot make effective use the absorbent capacity of the absorbent member.
[005] On the other hand, in the absorbent member (absorbent core) in the absorbent article described in Patent Literature 2, the base sheet and the plurality of small absorbent parts are integrally formed, but are separate parts, there are cases where it is difficult to transfer body fluid homogeneously. Therefore, the absorbent article described in Patent Literature 2 still has room for improvement in terms of the effective use of the absorbent capacity of the absorbent member.
[006] The present invention provides an absorbent article that can efficiently diffuse body fluid over a wide area of an absorbent member, and that can efficiently use the absorbent capacity of the same.
[007] The present invention relates to an absorbent article that includes a topsheet disposed on a side of the surface opposite the skin, a backsheet disposed on a surface side not opposite the skin, and a long absorbent member longitudinally disposed between the top sheet and the back sheet. The absorbent member includes an absorbent core that includes an absorbent polymer. The absorbent core includes a patterned block region that includes longitudinal grooves that extend in the longitudinal direction of the absorbent article; lateral grooves extending in the lateral direction of the absorbent article, and a plurality of longitudinally disposed long high weight base sections in respective sections divided by the longitudinal grooves and the side grooves, each of the high base weight sections having a base weight higher than the sections located in the longitudinal grooves and in the lateral grooves. The high weight base sections of the absorbent core are integrally formed with the low weight base sections made up of the sections located in the longitudinal grooves and in the lateral grooves. The lateral groove thickness is equal thinner than the longitudinal groove thickness, and the lateral groove width is greater than the longitudinal groove width in the planar view. DESCRIPTION OF DRAWINGS
[008] Figure 1 is a perspective view of an open-type disposable diaper according to an embodiment of the present invention.
[009] Figure 2 is a partially cut-out plan view of the disposable diaper illustrated in Figure 1 as seen from the side of the top sheet.
[010] Figure 3 is a cross-sectional view taken along line II of Figure 2.
[011] Figure 4 is a perspective view of the topsheet of a disposable diaper illustrated in Figure 1.
[012] Figure 5 is a plan view of an absorbent core of the disposable diaper illustrated in Figure 1 as seen from the side of the backsheet.
[013] Figure 6 is a partially enlarged plan view of the absorbent core illustrated in Figure 5.
[014] Figure 7 is a schematic diagram illustrating an exemplary device for the manufacture of absorbent members to be used in disposable diapers according to an embodiment of the present invention.
[015] Figure 8 is a cross-sectional view in the width direction of a portion (recess) of the outer peripheral surface of a rotating drum illustrated in Figure 7.
[016] Figure 9 is a schematic cross-sectional view illustrating a state in which an absorbent material has accumulated in the recess of the rotating drum illustrated in Figure 7.
[017] Figure 10 is an explanatory diagram to illustrate how the body fluid spreads over the absorbent core when the user wearing the disposable diaper illustrated in Figure 1 has excreted the body fluid.
[018] Figure 11 is a perspective view of a topsheet used in a disposable diaper according to another embodiment of the present invention.
[019] Figure 12 is a plan view, as seen from the side of the backsheet, of an absorbent core to be used in a disposable diaper according to another embodiment of the present invention.
[020] Figure 13 is a plan view, as seen from the side of the backsheet, of an absorbent core to be used in a disposable diaper according to another embodiment of the present invention.
[021] Figure 14 is a plan view, as seen from the side of the backsheet, of an absorbent core to be used in a disposable diaper according to another embodiment of the present invention.
[022] Figure 15 is a plan view, as seen from the side of the backsheet, of an absorbent core to be used in a disposable diaper according to another embodiment of the present invention. DESCRIPTION OF MODALITIES
[023] The absorbent article of the present invention will be described below in accordance with preferred embodiments thereof with reference to Figures 1 to 6. Figure 1 illustrates a perspective view of an open type disposable diaper according to an embodiment of the present invention. Figure 2 illustrates a partially cut away plan view of the disposable diaper shown in Figure 1 as viewed from the side of the topsheet. Figure 3 illustrates a cross-sectional view taken along line II of Figure 2. Figure 4 illustrates a perspective view of a topsheet of the disposable diaper illustrated in Figure 1. Figure 5 illustrates a plan view of an absorbent core of the disposable diaper illustrated in Figure 5. Figure 6 illustrates a partially enlarged plan view of the absorbent core illustrated in Figure 5.
[024] As illustrated in Figures 1 and 2, the disposable diaper 1 of the present embodiment (hereinafter also referred to as "nappy 1") includes a topsheet 2 disposed on the side of the surface opposite the skin; a backsheet 3 disposed on the side of the surface not opposite the skin; a longitudinally oblong absorbent member 4 disposed between the topsheet 2 and the backsheet 3. As illustrated in Figure 2, the diaper 1 is formed to be symmetrical bilaterally with respect to the centerline CL extending in the longitudinal direction.
[025] The diaper 1 of the present embodiment will be described in greater detail. As illustrated in Figure 2, diaper 1 has a stomach side section A, a rear section B, and a genitalia section C positioned between the stomach side and rear sections A and B, the three sections being defined by dividing the diaper 1 in three in the longitudinal direction (hereinafter referred to as the "Y direction"; the Y direction is the direction parallel to the centerline CL) of diaper 1 in the unfolded state. The stomach side section A is the section located on the wearer's stomach side when the diaper is worn; the rear section B is the section located on the user's back side, and the genitalia section C is the section located on the user's genitalia. The genitalia section C is located in the central diaper section 1 in the longitudinal direction (Y direction). It should be noted that the direction orthogonal to the longitudinal Y direction (Y direction) is described as the lateral direction of diaper 1 (hereinafter also referred to as the “X direction”).
[026] In the present description, "surface opposite the skin" refers to the surface surfaces of the front and back of each component, such as the top sheet 2, which constitutes the diaper 1 - which is disposed towards the side of the the wearer's skin when the diaper is worn, and the "non-skin surface" refers to the front and back surface surfaces of each component, such as topsheet 2 - which faces away from the skin side of the user when the diaper is worn.
[027] As illustrated in Figure 2, in this diaper 1, the side edges of the stomach side section A and the side edges of the back section B extend outward in the lateral direction (X direction) rather than the side edges of the section of genitalia C. In addition, the lateral edges of the section of genitalia C are curved in an arc inward in the lateral direction (X direction). Therefore, the diaper 1 as a whole has a shape that is narrowed inward at the center section in the longitudinal direction (Y direction). The topsheet 2 and the backsheet 3 extend outwardly from the side edges and the front and back edges of the absorbent member 4. As illustrated in Figure 3, the dimension of the topsheet 2 in the lateral direction (X direction) is smaller than the dimension of the back sheet 3 in the lateral direction (X direction). The topsheet 2 and the backsheet 3 are joined together directly, or with another member interposed between them, in their outwardly extending sections that extend outwardly from the peripheral edges of the absorbent member 4, and thus the sheet The top sheet and the backsheet press and secure the absorbent member 4 therebetween. The adhesive for securing the absorbent member 4 will be described in detail below.
[028] As illustrated in Figures 1 and 2, the diaper 1 is an open-type diaper. A pair of securing tapes 7, 7 is provided on the side edge sections of the back section B, and a landing tape 8 for securing the securing tapes 7,7 is provided from the outer surface (surface opposite the skin ) of the stomach side section A. As illustrated in Figure 2, the respective diaper side sections 1 along the longitudinal direction (Y direction), the permanent pleat forming sheets 62, each being provided with elastic members 61 affixed along the Y direction on their stretched side, they are arranged in and fixed to the respective side sections of the top sheet 2, and therefore a pair of permanent pleats 6, 6 is formed (as per Figures 1 and 3). Furthermore, as illustrated in Figure 2, on each side section of the diaper 1 along the longitudinal direction (Y direction), a plurality of elastic leg members 63 to form the leg pleats are disposed along the Y direction in its state. stretched, and therefore the leg creases are formed by the contraction of the elastic leg members 63. In addition, in the longitudinal end section on the side of the back section B of the diaper 1, the elastic waist section members 64 to form the Waist pleats are arranged along the X direction in their stretched state, and therefore the waist pleats are formed by contracting the elastic members of the waist section 64.
[029] As illustrated in Figures 2 to 4, on the diaper 1, the topsheet 2 has several projections 21, which project to the surface opposite the skin, and recesses 22 adjacent to the projections 21, and the side opposite the skin of the topsheet 2 has a projecting and recessed structure, while the side of the surface that is not opposite the skin of the topsheet 2 is flat. As illustrated in Figure 4, the topsheet 2 of the diaper 1 includes a first layer 23 and a second layer 24 which are sheet-forming articles. The first layer 23 constitutes the surface opposite the skin of the topsheet 2, and the second layer 24 constitutes the surface that is not opposed to the skin of the topsheet 2. As illustrated in Figure 4, the first layer 23 forms the various projections 21, each projecting to the side of the surface opposite the skin and having a hollow inner part, and also forms the recesses 22 between the projections 21. The second layer 24 has a planar shape. It should be noted that, in each recess 22, the first layer 23 and the second layer 24 are joined by means of a joining section 25. Each recess 22 includes the aforementioned joining section 25, and a non-joining section along the outer peripheral edge of the joining section 25.
[030] As illustrated in Figure 4, on the top sheet 2 of diaper 1, each projection 21 is surrounded at four points by recesses 22 each having a joining section 25, and the lower surface of the projection is rectangular in a planar view. Each projection 21, taken as a whole, is a flat rectangular parallelepiped, or a truncated square pyramid with rounded crest lines. Each recess 22 is also rectangular in a planar view. It should be noted that, on this topsheet 2 of the diaper 1, each projection 21 is surrounded by the joining sections 25 (indentations 22) at four points, but the projection can be surrounded by the joining sections 25 (indentations 22) and more than four points.
[031] As illustrated in Figure 4, on the top sheet 2 of the diaper 1, the projections 21 and the recesses 22 form a row in which they are alternately arranged along the Y direction, and a plurality of these rows are arranged in the X direction. a discretionary projection 21 is observed in one of the aforementioned rows, there is no projection at locations adjacent to that projection 21 in the adjacent rows which are left and right in the X direction of the aforementioned row. Specifically, in two rows adjacent to each other in the X direction, the joining sections 35 (recesses 22) are arranged by being shifted half the distance in the Y direction. Therefore, when a discretionary joining section 25 (recesses 22) in a of the aforementioned rows, that the joining section (recess 22) is a closed recess formed being surrounded by the projections 21 at the front, rear left and right. In other words, in a planar view of the topsheet 2 from the side of the first layer 23, the joining sections 25 (recesses 22) are in a staggered arrangement, and the projections 21 are also in a staggered arrangement.
[032] From the point of view of reducing the contact pressure against the body and the comfort of wearing the diaper, it is preferable that the height h (as shown in Figure 4) of the projection 21 is 0.5 mm or more, preferably 1 mm or more, and 5 mm or less, preferably 4 mm or less, and more specifically, preferably from 0.5 mm to 5 mm inclusive, and more preferably from 1 mm to 4 mm inclusive. Furthermore, it is preferable that the lower dimension L1 (as per Figure 4) of the projection 21 along the Y direction is 2 mm or more, and 30 mm or less, preferably 5 mm or less, and more specifically preferably 2 mm to 30 mm inclusive, and more preferably from 2 mm to 5 mm inclusive. Furthermore, it is preferable that the lower dimension L2 (as per Figure 4) of the projection 21 along the X direction is 2 mm or more, and 30 mm or less, preferably 5 mm or less, and more specifically, preferably 2 mm to 30 mm inclusive, and more preferably from 2 mm to 5 mm inclusive. It is preferable that the lower area of projection 21 is 4 mm2 or more, and 900 mm2 or less, preferably 25 mm2 or less, and more specifically, preferably 4 mm2 to 900 mm2 inclusive, and more preferably 4 mm2 to 25 mm2 inclusive. .
[033] From the point of view of pleasantness to the touch and good quilted feel, it is preferable that the L3 extension (as per Figure 4) in the X direction, of the joining section 25 in the recess 22 is 0.1 mm or more, preferably 0.5 mm or more, and 20 mm or less, preferably 5 mm or less, and more specifically 0.1 mm to 20 mm inclusive, preferably 0.5 mm to 5 mm inclusive. It should be noted that the extension of the joining section 25 in the Y direction is the same as in the L3 extension.
[034] The first layer and the second layer 24 can be made of the same sheet-shaped article or of different sheet-shaped articles. The sheet-shaped article is substantially inelastic. Any substantially inelastic material conventionally known without particular limitation as the sheet material can be used. Examples thereof include various non-woven fabrics, such as carded-manufactured non-woven fabrics, spin-bonded non-woven fabrics, blown non-woven fabrics, hydroentangled non-woven fabrics, and hydroentangled non-woven fabrics. Furthermore, films which are liquid impermeable per opening device can be used. In cases of use of a non-woven cloth as the sheet-forming article, it is preferable that, from the standpoint of assuring the strength of the topsheet 2 and improving touchability, the fineness of the constituent fiber is 1 dtex (decitex) or more preferably 1.5 dtex or more, and 20 dtex or less, preferably 5.6 dtex or less, and more specifically from 1 dtex to 20 dtex inclusive, and more preferably from 1.dtex to 5.6 dtex inclusive.
[035] It is preferable that the basis weight of the first layer 23 is 20 g/m2 or more, preferably 15 g/m2 or more, and 100 g/m2 or less, preferably 30 g/m2 or less, and more specifically, preferably from 10 g/m2 to 100 g/m2 inclusive, and more preferably from 15 g/m2 to 30 g/m2 inclusive. It is preferable that the basis weight of the second layer is 5 g/m2 or more, preferably 10 g/m2 or more, and 50 g/m2 or less, preferably 30 g/m2 or less, and more specifically, preferably 5 g /m2 to 50 g/m2 inclusive, and more preferably from 10 g/m2 to 30 g/m2 inclusive. It is preferred that the basis weight of the entire topsheet 2, including the first layer 23 and the second layer 24, is 15 g/m2 or more, preferably 20 g/m2 or more, and 150 g/m2 or less, preferably 60 g/m2 or less, and more specifically preferably from 15 g/m2 to 150 g/m2 inclusive, and more preferably from 20 g/m2 to 60 g/m2 inclusive.
[036] Suitable methods for manufacturing the topsheets 2 having the aforementioned structure are described in JP 2004-174234 A and JP 2005-111908 A, which earlier applications of the applicant.
[037] As illustrated in Figures 2 and 3, the absorbent member 4 includes an absorbent core 41 that includes an absorbent polymer, and, in that diaper 1, the absorbent member 4 also includes a lining material 42 that surrounds the absorbent core 41. In the diaper 1, the absorbent member 4 is formed by covering the absorbent core 41, which is oblong in the longitudinal direction (Y direction) and which retains liquid, with the coating material 42 which is a hydrophilic liquid permeable sheet.
[038] As illustrated in Figures 2 and 5, the absorbent core 41 includes a block pattern region 411 that includes longitudinal grooves 44Y that extend in the longitudinal direction (Y direction), the lateral grooves 44X that extend in the lateral direction ( X direction); and a plurality of longitudinally long high basis weight sections 43 disposed in respective sections divided by longitudinal grooves 44Y and lateral grooves 44X, each of the high basis weight sections 43 having a higher basis weight than the sections in the grooves. 44Y longitudinal grooves and 44X lateral grooves. It should be noted that, below, the sections in the 44Y grooves and the 44X side grooves are collectively referred to as “lightweight sections 44 (44X side grooves, 44Y longitudinal grooves”), because the absorbent core 41 in the sections located in the 44Y longitudinal grooves and in the lateral grooves 44X constitute sections that have a relatively lower basis weight than the high basis weight sections 43. The absorbent core will be described in detail. As illustrated in Figure 3, in this diaper 1, the absorbent core 41 includes: high basis weight sections 43 which have a relatively high basis weight and which project towards the side of the backsheet 3; and low basis weight sections 44 (side grooves 44X, longitudinal grooves 44Y) which are adjacent to the high basis weight sections 43, have a relatively low basis weight, and are recessed towards the side of the top sheet 2. absorbent core 41, high basis weight sections 43 are integrally formed with low basis weight sections 44 (side grooves 44X, longitudinal grooves 44Y). As illustrated in Figure 3, in the absorbent core 41 of the diaper 1, the side of the absorbent core surface 41 that is not opposed to the skin 41 has: projection sections (high basis weight sections 43) that project from the sheet side top 2 towards the side of the back sheet; and undercut sections (low basis weight sections 44 (side grooves 44X, longitudinal grooves 44Y)) that are undercut from the backsheet 3 side towards the topsheet side 2. Also, the side of the surface opposite the skin of the absorbent core 41 is flat. The absorbent core will be described in more detail below.
[039] As illustrated in Figures 2 and 5, the high basis weight sections 44 of the absorbent core 41 in the diaper 1 include: sections located in the plurality of lateral grooves 44X that extend linearly (in continuous straight lines) in the lateral direction ( X direction) and sections located in the plurality of longitudinal grooves 44Y that extend linearly (in continuous straight lines) in the longitudinal direction (Y direction). The block pattern region 41 of the absorbent core 41 provided in diaper 1 is formed in a lattice pattern as a whole by linear lateral grooves 44X extending in the lateral direction (direction X) and longitudinal grooves 44Y extending in the direction longitudinal (Y direction) and is formed so that the high basis weight sections 43, which are plies in the longitudinal groove, are arranged in the respective sections divided by the linear lateral grooves 44X and the longitudinal grooves 44Y (i.e., in the respective positions of the trellis cells).
[040] As illustrated in Figures 2, 3 and 5, the absorbent core 41 includes the block pattern region 411 that includes the lateral grooves 44X and the longitudinal grooves 44Y that are arranged in a lattice pattern; and the high basis weight sections 43 which are disposed in respective sections divided by the lateral grooves 44X and the longitudinal grooves 44Y. In addition, in such diaper 1, the absorbent core 41 also includes a non-blocking region 412 disposed along the outer periphery of the block pattern region 411. As illustrated in Figure 5, the entire width WA of the absorbent core 41 in the section on the stomach side A is the same as the entire width WB of it on the rear section B; and the width WA1 of the block pattern region 411 in the stomach side section A is the same as the width WB1 of the block pattern region 411 in the back section B. This is, as illustrated in Figures 2 and 5, the region block pattern region 411 is formed in a rectangular shape that is oblong in the longitudinal direction (Y direction), and the width WA1 of the block pattern region 411 in the stomach side section A is the same as the width WB1 of the same in the rear section B. As illustrated in Figures 2 and 5, the non-blocking pattern region 412 disposed along the outer periphery of the block pattern region 411 is formed so that both side edges in the stomach side section A and both side edges on rear section B extend outward in the lateral direction (X direction) by the same extent as the respective side edges on genitalia section C in such a way that the entire width WA and the entire width WB become the same. Therefore, as a whole the non-block region 412 is formed in a shape in which a section from the central section in the longitudinal direction (Y direction) towards the stomach side section A is narrowed inwards, and the total area of the rear section B is greater than the total area of the stomach side section A. Like the high basis weight sections 43, the non-blocking region 412 includes a greater amount of absorbent material than the basis weight sections low 44.
[041] The block pattern region 411 of the absorbent core 41 will be described in greater detail. As illustrated in Figure 5, in this diaper 1, a block structure includes five high basis weight sections 43 - which are divided by side grooves 44X and side grooves 44Y - regularly arranged in the lateral direction (X direction) and fourteen rows of such block structures are evenly disposed in the longitudinal direction (Y direction) from the stomach side section A to the back section B. As illustrated in Figure 5, in the block pattern region 411 of the diaper 1, six longitudinal grooves 44Y extending in the longitudinal direction (Y direction) are arranged in straight lines from stomach side section A to rear section B.
[042] As described above, the high basis weight sections 43 of the absorbent core 41 are formed integrally with the low basis weight sections 44 (side grooves 44X, longitudinal grooves 44Y), as illustrated in Figure 3, and in this diaper 1, the non-blocking region 412 is also integrally formed with the high basis weight sections 43 and the low basis weight sections 44 (side grooves 44X, longitudinal grooves 44Y). Here, the expression “integral formed” means that the high basis weight sections 43, the low basis weight sections 44 (side grooves 44X, longitudinal grooves 44Y), and the non-block region 412 are inseparably integrated. without the use of bonding device such as an adhesive or thermal fusion bonding and are formed in an integrated manner from the same material. By integrally forming the high basis weight sections 43, the low basis weight sections 44 (the lateral grooves 44X, the longitudinal grooves 44Y), and the non-blocking region 412, the absorbent core is provided with a continuity that allows the body fluid to move homogeneously. A method for making such an absorbent member 4 will also be described below.
[043] As illustrated in Figure 3, in this diaper 1, the absorbent core 41 has a pulp-only layer 410 formed on the side most directed to the surface not opposite the skin. This is described more specifically. The high basis weight sections 43 that make up the block pattern region 411 project to the side of the backsheet 3, and the non-block region 412 also projects to the side of the backsheet 3. Also, as per illustrated in Figure 3, in this diaper 1, the low basis weight sections 44 (longitudinal grooves 44Y) that make up the block pattern region 411 are recessed towards the side of the topsheet 2. In this way, as illustrated in Figure 3 , in the direction of diaper 1 thickness T, the overhanging sections (high basis weight sections 43) that protrude from the topsheet 2 side to the backsheet 3 side, and the recessed sections (base weight sections bottom 44 (side grooves 44X, longitudinal grooves 44Y)) which are lowered from the side of the backsheet 3 towards the side of the topsheet 2 are formed on the non-skin side of the absorbent core 41 of the diaper 1. side more towards the surface not opposite the skin - that is, the top section of each of the high basis weight sections 43 and the non-block region 412 - is formed by the pulp-only layer 410.
[044] In addition, the recessed sections (grooves) in the absorbent core 41 that are lowered towards the side of the topsheet 2 are mainly comprised of the low basis weight sections 44 (side grooves 44X, longitudinal grooves 44Y), and the absorbent core projection sections 41 which project towards the side of the backsheet 3 are mainly made up of the high basis weight sections 43 and the non-block region 412. Here, the expression “the recessed sections are made up mainly of the 44” low basis weight sections include cases where, for example, a 43 high basis weight section close to the boundary between a 44 low basis weight section and a 43 high basis weight section forms a part of the undercut section . Likewise, the expression "projection sections are mainly made up of the high basis weight sections 43 and the non-block region 412" includes cases where, for example, a low basis weight section 44 close to the boundary between the high basis weight sections 43 and a low basis weight section 44 form a portion of the protruding section.
[045] Furthermore, as illustrated in Figure 3, in the absorbent core 41 of the diaper 1, the low basis weight sections 44 are unevenly distributed on the side of the topsheet 2 (i.e., the side of the surface opposite to the skin of the absorbent member 4) in the direction of the thickness T of the diaper 1. The topsheet 2 side of the absorbent core 41 is flat, as illustrated in Figure 3.
[046] As illustrated in Figures 5 and 6, in the absorbent core 41 of the absorbent member 4 provided in the absorbent article of the present invention, each of the plurality of high basis weight sections 43, which is disposed in respective sections divided by lateral grooves 44X and the longitudinal groove 44Y, is formed to be long in the longitudinal direction (Y direction), and also, the thickness of the lateral groove 44X is the same as or thinner than the thickness of the longitudinal groove 44Y, and the width of the 33X lateral groove is wider than the 44Y longitudinal groove in a planar view. It should be noted that, from the standpoints of liquid absorption and liquid diffusion, it is preferable that the thickness of the lateral groove 44X be the same as or thinner than the thickness of the longitudinal groove 44Y.
[047] In cases where the absorbent core 41 is used in a disposable diaper, it is preferable that the entire length of the nude 41 in the longitudinal direction (Y direction) is from 250 mm to 550 mm inclusive, and the entire width in the lateral direction ( direction X) is from 50 mm to 200 mm inclusive.
[048] It is preferable that the extent of the block pattern region 411 in the longitudinal direction (Y direction) with respect to the entire extent of the absorbent core 41 in the Y direction is 70% or greater, preferably 85% or greater, and 98% or less, preferably 95% or less, and more specifically, preferably from 70% to 98% inclusive, and more preferably from 85% to 95% inclusive.
[049] It is preferable that the extent of the block pattern region 411 in the lateral direction (X direction) with respect to the entire width of the absorbent core 41 in the X direction is 30% or more, preferably 50% or more, and 90% or less, preferably 70% or less, and more specifically preferably 30% to 90% inclusive, and more preferably 50% to 70% inclusive.
[050] In cases of use of a disposable diaper, it is preferable that the entire width of the block pattern region 411 in the longitudinal direction (Y direction) be from 100 mm to 540 mm inclusive, and the entire width of the pattern region in block 411 in the lateral direction (X direction) is from 20 mm to 140 mm inclusive.
[051] In cases of use of a disposable diaper, it is preferable that the extension, in the longitudinal direction (Y direction), of each of the end sections, in the longitudinal direction (Y direction), of the region other than in block 412 is 10mm to 150mm inclusive.
[052] In cases of use of a disposable diaper, it is preferable that the extension, in the lateral direction (X direction), of each of the side sections of the non-block region 412 that extends along the longitudinal direction (Y direction ) is 10 mm to 40 mm inclusive in the stomach side section A, 10 mm to 30 mm inclusive in the genitalia section C, and 10 mm to 40 mm inclusive in the rear section B.
[053] The size, basis weight, and the like of the high basis weight sections 43 and the low basis weight sections 44 (side grooves 44X, longitudinal grooves 44Y) that make up the block pattern region 411 will be described. in greater detail.
[054]As illustrated in Figure 2, in this diaper 1, each high basis weight section 43 is formed into a rectangular shape that is oblong in the longitudinal direction (Y direction) in a planar view. It should be noted that although the high basis weight section 43 on this diaper is formed into a rectangular shape in a planar view, the four corners may be formed into an arc shape, or the high basis weight sections may be polygonal or elliptical, or a combination thereof.
[055] In cases where the absorbent article is used as a disposable diaper, for example, the extension L4, in the longitudinal direction (Y direction), of each high basis weight section 43 in diaper 1, as illustrated in Figure 6, is 5mm or more, preferably 15mm or more, and 30mm or less, preferably 25mm or less, and more specifically preferably from 5mm to 30mm, and more preferably from 15mm to 25mm inclusive. Furthermore, it is preferable that the L5 extension of each high basis weight section in the lateral direction (X direction) is 3mm or more, preferably 5mm or more, and 20mm or less, preferably 15mm or less, and more specifically, preferably from 3mm to 20mm inclusive, and more preferably from 5mm to 15mm inclusive.
[056] As illustrated in Figure 6, the width L6 of the 44X linear lateral groove extending in the lateral direction (X direction) is wider than the L7 width of the 44Y linear longitudinal groove extending in the longitudinal direction (Y direction) , and it is preferably that the ratio, the widthL6/width L7, is 110% or more, preferably 120% or more, and 500% inclusive, and more preferably 120% to 300% inclusive.
[057] It is preferable that the width L6 of the 44X linear lateral groove, which extends in the lateral direction (X direction), with respect to the extension (L4) of the high basis weight section 43 in the longitudinal direction (Y direction) is 2 % or more, preferably 5% or more, and 25% or less, preferably 20% or less, and more specifically, preferably 2% to 25% inclusive, and more preferably from 5% to 20% inclusive.
[058] It is preferable that the width L7 of the linear longitudinal groove 44Y, which extends in the longitudinal direction (Y direction), with respect to the L5 extension of the high basis weight section 43 in the lateral direction (X direction) is 2% or more preferably 10% or more, and 30% or less, preferably 25% or less, and more specifically preferably 2% to 30% inclusive, and more preferably 10% to 25% inclusive.
[059] In cases where the absorbent article is used as a disposable diaper, for example, it is preferable that the width L6 of the 44X linear lateral groove, which extends in the lateral direction (X direction), is 0.5 mm or more, preferably 1 mm or more, and 5 mm or less, preferably 3 mm or less, and more specifically, preferably d 0.5 mm to 5 mm inclusive, and more preferably 1 mm to 3 mm inclusive.
[060] In cases where the absorbent article is used as a disposable diaper, for example, it is preferable that the width L7 of the linear longitudinal groove 44Y, which extends in the longitudinal direction (Y direction), is 0.01 mm or more, preferably 0.02 mm or more, and 4.6 mm or less, preferably 2.8 mm or less, and more specifically, preferably 0.01 to 4.6 mm inclusive, and more preferably 0.02 mm absorbent article 2.8 mm inclusive.
[061]It should be noted that widths L4 and L5 are values measured at the lower position of the recessed section (low basis weight section 44 (side groove 44X, longitudinal groove 44Y)) in absorbent member 4.
[062] The thickness of the 44X side groove is the same as or thinner than the thickness of the 44Y longitudinal groove, and it is preferable to the thickness of the low basis weight 44 section (44X side groove, 44Y longitudinal groove) (a thickness in the lower section of the low basis weight section 44 (side groove 44X, longitudinal groove 44Y)) with respect to the thickness of the high basis weight section 43 is from 30% to 90% inclusive. More specifically, it is preferable that the thickness of the low basis weight section 44 (side groove 44X, longitudinal groove 44Y) is 1.5mm or less, and more specifically, preferably 1.5mm to 4.5mm inclusive, and more preferably from 2.5 mm to 4.0 mm inclusive. The thickness of the longitudinal groove 44Y and the thickness of the lateral groove 44X will be described in more detail. It is preferred that the lateral groove 44X is thinner than the longitudinal groove 44Y, and that the thickness of the longitudinal groove 44Y is 1.5 mm or more, preferably 2.5 mm or more, and 4.5 mm or less, preferably 4.0 mm or less, and more specifically preferably from 1.5 mm to 4.5 mm inclusive, and more preferably from 2.5 mm to 4.0 mm inclusive. Furthermore, it is preferable that the thickness of the 44X lateral groove is 1.5 mm or more, preferably 2.5 mm or more, and 4.5 mm or less, preferably 4.0 mm or less, and more specifically, preferably from 1.5 mm to 4.5 mm inclusive, and more preferably from 2.5 mm to 4.0 mm inclusive. It is preferable that the thickness of the high basis weight section 43 is 2mm or more, preferably 3mm or more, and 8mm or less, preferably 7mm or less, and more specifically preferably 2mm to 8mm inclusive. , and more preferably from 3mm to 7mm inclusive. The thickness of the non-block region 412 is the same as the thickness of the high basis weight section 43.
[063]It should be noted that the thickness of each high basis weight section 43, low basis weight section 44 (side groove 44X, longitudinal groove 44Y), and the non-block region 412 is measured by cutting a sample to a predetermined size, compressing the section to be measured for 10 minutes at a pressure of 5 kPa, and measuring the thickness immediately after releasing the load. At least three points including at least one discretionary point on each stomach side section, the genitalia section, and the rear section per diaper sheet - are employed as measurement sites, and thickness is found as an average of two sheets of diaper samples (ie, an average of at least six measurement sites). For example, a diaper 1 is cut in the longitudinal direction (Y direction) or in the lateral direction (X direction) as illustrated in Figure 2 with a sharp knife, and the cross section of the cut sample is measured. The thickness of the high basis weight section 43, as well as the thickness of the non-block region 312, is the value measured at the thickest position in the projection section, and the thickness of the low basis weight section 44 (side groove 44X, longitudinal groove 44Y) is the value measured at the thinnest position at the bottom of the recessed section. In cases where it is difficult to carry out measurement with the naked eye, the measurement can be carried out, for example, by observing the cross-section of the cut sample using a microscope (VHX-100 from Keyence Corporation) with a magnification of 20x to 50x.
[064] In cases where the absorbent article is used as a disposable diaper, for example, it is preferable that, from the standpoint of softness and efficient diffusion of body fluid over a wide area of the absorbent member and the efficient use of the absorbent capacity, the basis weight of the low basis weight section 44 (side groove 44X, longitudinal groove 44Y) with respect to the basis weight of the high basis weight section 43 is 20% or more, preferably 30% or more, and 80% or less, preferably 70% or less, and more specifically, preferably from 20% to 80% inclusive, and more preferably from 30% to 70% inclusive.
[065] More specifically, it is preferable that the basis weight of the low basis weight section 44 (side groove 44X, longitudinal groove 44Y) is 100 g/m2 or more, preferably 150 g/m2 or more, and 500 g/ m2 or less, preferably 400 g/m2 or less, and more specifically preferably from 100 g/m2 to 500 g/m2 inclusive, and more preferably from 150 g/m2 to 400 g/m2 inclusive. Furthermore, it is preferable that the basis weight of the high basis weight section 43 is 300 g/m2 or more, preferably 350 g/m2 or more, and 900 g/m2 or less, preferably 800 g/m2 or less, and more specifically, preferably from 300 g/m2 to 900 g/m2 inclusive, and more preferably from 350 g/m2 to 800 g/m2 inclusive. The basis weight of the non-block region 412 is the same as the basis weight of the high basis weight section 43.
[066] The basis weight of the high basis weight section 43 and the low basis weight section 44 (side groove 44X, longitudinal groove 44Y) is measured as follows. <Method to Measure Base Weight>
[067] A method for measuring the basis weight of the high basis weight section 43, the low basis weight section 44 (side groove 44X, longitudinal groove 44Y), and the non-block region 412 is described below.
[068]The absorbent core 41 is cut along the edge lines between the high basis weight sections, high basis weight section 43 and the low basis weight sections, low basis weight section 44 (side grooves 44X, longitudinal grooves 44Y) using a single edge razor from Feather Safaty Razor Co., Ltd. Each of ten small pieces of high basis weight sections 43 high basis weight section obtained by cutting is measured with an electronic scale scale ( GR-300 electronic scale scale from A&D Co., Ltd, with an accuracy of up to desirably thousandths), to acquire the average single small piece weight of the high basis weight section 43. The basis weight of the weight section base high 43 is calculated by dividing the average acquired weight by the average area of a single small piece of the high base weight section 43. The base weight of the non-block region 412 is calculated in the same way as the base weight of the high basis weight section 43.
[069] Then, five small pieces of the low basis weight sections that form the thin strip 44 (longitudinal grooves 44Y), each having a length of 100 mm and a width that matches the design dimension of the weight section width base 44 (longitudinal groove 44Y), are cut using a single edge razor from Feather Safaty Razor Co., Ltd. cutting along edge lines that extend in the longitudinal direction (Y direction) between the weight sections of high base 43 and low base weight sections 44 (longitudinal grooves 44Y). Each of the five small parts is measured with an electronic scale scale (GR-300 electronic scale scale from A&D Co., Ltd., with an accuracy of up to ten thousandths), to acquire the average weight of a single small part of the section. of high basis weight low basis weight section 44 (longitudinal groove 44Y) per average. The basis weight of the low basis weight section 44 (longitudinal groove 44Y) is calculated by dividing the average acquired weight by the average area of a single small piece of the low basis weight section 44 (longitudinal groove 44Y). The basis weight of the low basis weight section 44 (side groove 44X) is calculated in the same way as for the low basis weight section 44 (longitudinal groove 44Y).
[070] In the absorbent member 4 of the diaper 1, the high basis weight sections 43 and the non-block region 412 are formed to have substantially the same density as or a higher density than the weight sections of base base 44 (side grooves 44X, longitudinal grooves 44Y).
[071] In cases where the absorbent article is used as a disposable diaper, for example, it is preferable that, from the point of view of liquid diffusion and the slant and adjustability of the absorbent member, the density of the section density of low basis weight 44 (side groove 44X, longitudinal groove 44Y) with respect to the density of the high basis weight section 43 is 50% or more, preferably 75% or more, and 100% or less, preferably 95% or less , and more specifically, preferably 50% to 100% inclusive, and more preferably 75% to 95% inclusive.
[072] Specifically, it is preferable that the density of the low basis weight section 44 (side groove 44X, longitudinal groove 44Y) is 0.05 g/cm3 or more, preferably 0.7 g/cm3 or more, and 0 .15 g/cm3 or less, preferably 0.13 g/cm3 or less, and more specifically, preferably 0.05 g/cm3 to 0.15 g/cm3 inclusive, and more preferably from 0.07 g/cm3 to 0 .13 g/cm3 inclusive. Furthermore, it is preferable that the density of the high basis weight section 43 is 0.05 g/cm3 or more, preferably 0.07 g/cm3 or more, and 0.15 g/cm3 or less, preferably 0.13 g/cm3 or less, and more specifically preferably from 0.05 g/cm3 to 0.15 g/cm3 inclusive, and more preferably from 0.7 g/cm3 to 0.13 g/cm3 inclusive. The density of the non-block 412 region is the same as the density of the high basis weight section 43.
[073] The respective densities of the high basis weight section 43, the non-block region 412, and the low basis weight section 44 (side groove 44X, longitudinal groove 44Y) are calculated by dividing the respective basis weights of the high basis weight section 43, from the non-block region 412 and the low basis weight section 44, which were purchased in accordance with the above mentioned methods, for their respective thicknesses acquired in accordance with the above mentioned methods.
[074] In diaper 1, spaces 9 are formed between the liner material 42 and the respective low basis weight sections low basis weight section 44 (side grooves 44X, longitudinal grooves 44Y) of the absorbent core 41. words, the spaces 9 formed by the absorbent core 41 and the liner material 42 surrounding the absorbent core 41 are formed in the absorbent member 4. As described above, in the diaper 1, as illustrated in Figures 2 and 3: the weight sections of base low low base weight section 44 (side grooves 44X, longitudinal grooves 44Y) are formed in a lattice pattern as a whole on the backsheet 3 (non-skin surface) of the absorbent core 41; the high basis weight sections the high basis weight section 43 are arranged in the respective positions of the truss cells; and low basis weight sections, low basis weight section 44 (side grooves 44X, longitudinal grooves 44Y) are formed to surround each high basis weight section 43. Therefore, in diaper 1, a plurality of 9X spaces by the facing material 42 and the lateral grooves 44X, which are recessed towards the side of the topsheet 2, each extending continuously in the lateral direction (X direction) so as to correspond to the respective lateral grooves 44X, and a plurality of 9Y spaces formed by the cladding material 42 and the longitudinal grooves 44Y, which are recessed towards the side of the top sheet 2, each extending continuously in the longitudinal direction (Y direction) so as to correspond to the respective longitudinal grooves 44Y, as per illustrated in Figures 2 and 3.
[075] As illustrated in Figure 3, in the disposable diaper 1, a hydrophilic intermediate sheet 5 is disposed between the absorbent member 4 and the topsheet 2. More specifically, a rectangular intermediate sheet 5 that is oblong in the longitudinal direction (Y direction) is disposed between the topsheet 2 and the facing material 42 constituting the absorbent member 4. The intermediate sheet 5 is a so-called underlayer sheet, and is arranged from the stomach side section A to the back section. B so as to cover the absorbent core 41 constituting the absorbent member 4. It is preferable that the basis weight of the intermediate sheet 5 (underlayer sheet) is from 15 g/m2 to 100 g/m2 inclusive. As for the intermediate sheet 5 (sub-layer sheet), it is possible to use a sheet made mainly of hydrophilic fibers (a sheet in which the hydrophilic fiber content is preferably 90 by mass or more, and examples of such sheet include paper, cloths nonwovens, and wefts.
[076] In the diaper 1, the absorbent core and the lining material 42 surrounding the absorbent core are fixed by means of an adhesive, and the absorbent member 4, which includes the thus-fixed absorbent core 41 and the lining material 42, it is attached to the top sheet 2 and the back sheet 3 by means of an adhesive. Particularly, in diaper 1, the lining material 42 and the non-skin surface 41U of the absorbent core 41 are joined by a non-skin-side adhesive absorbent member 5IU, and the non-skin-side adhesive absorbent member. 5IU skin side is applied intermittently in the lateral direction (X direction) of the diaper 1, and in straight lines in the longitudinal direction (Y direction). Specifically, as illustrated in Figure 3, in diaper 1, a single sheet of lining material 42 is used to wrap the absorbent core 41 by folding both sections of lining material 42 and overlapping the side edge sections of lining material 42 in the back sheet 3 of the absorbent core 41. Therefore, in that single sheet of coating material 42, the section disposed on the skin side opposite the skin 41T of the absorbent core 41 constitutes a skin side covering member 421, and the section disposed on the side of the non-skin surface 41U of the absorbent core 41 constitutes a non-skin side covering member 422. It should be noted that despite the skin side covering member 421 and the non-skin side covering member skin 422 are made from a single sheet of backing material 42 in such diaper 1 as described above, they may be made from two separate sheets of backing materials. The non-skin side covering member 422 of the backing material 42 on the backsheet 3 and the non-skin surface 41U of the absorbent core 41 are secured by means of the non-skin side absorbent member adhesive 51U (as per Figure 3(a))
[077] As illustrated in Figure 3(a), in this diaper 1, the non-skin-side adhesive absorbent member 5IU is applied intermittently in the lateral direction (X direction) and in straight lines in the longitudinal direction (Y direction ) with a coater gun, for example, and is applied in a strip pattern when viewed as a whole. It is preferable that the distance between lines of the non-skin side 51U absorbent member adhesive adjacent to each other in the lateral direction (direction X) is from 0.5mm to 15mm inclusive. It is preferable that the basis weight for applying the non-skin-side 51U absorbent member adhesive (i.e. the application amount) is 0.5 g/m2 or more, preferably 1 g/m2 or more, preferably g/m2 or more, and 15 g/m2 or less, and more specifically preferably from 0.5 g/m2 to 15 g/m2 inclusive, and more preferably from 1 g/m2 to 10 g/m2 inclusive.
[078] Next, a method for manufacturing an absorbent member 4 provided in a diaper 1 will be described - i.e., an absorbent member 4 that includes an absorbent core 41 in which the high basis weight sections of the high basis weight section 43 (high density), an unblocked region (412) (high density), and low basis weight sections 44 (low density) low basis weight section (side grooves 44X and longitudinal grooves 44Y) are integrally formed .
[079] Figure 7 illustrates an embodiment of a method for manufacturing an absorbent member 4 and a manufacturing device used for the same. The device for making an absorbent member 4 includes: a rotating drum 50 which is driven to rotate in the direction of arrow R1; a channel 60 which provides, to the outer peripheral surface of the rotating drum 50, an absorbent material 45 which includes an absorbent polymer and which is the raw material for the absorbent core 41; a transfer roller 70 which is driven to rotate in the direction of arrow R2, and which is arranged obliquely below the rotating drum 50 on the downstream side thereof, a vacuum box 65 disposed between the channel 60 and the transfer roller 70 in the circumferential direction of the rotating drum 50; a mesh belt 75 which is an air-impermeable sheet-shaped member and which is arranged to pass between the vacuum box 65 and the rotating drum 50 and between the transfer roller 70 and the rotating drum 50, and a vacuum conveyor 80 disposed below the transfer roller 70.
[080] The rotating drum 50 has a cylindrical shape as shown in Figure 7, and a member that forms the outer peripheral surface of the rotating drum 50 rotates around a horizontal geometric axis by receiving energy from a main impeller, such as like an engine. A space 56 whose internal part can be pressure-reduced is formed in the non-rotating section within the rotating drum 50 (on the side of the axis of rotation). An exhaust device (not shown), such as an air suction fan, is connected to space 56; by actuating the exhaust device, the inner part of the space 56 can be kept at a negative pressure. On the other hand, pipes (not shown) capable of taking air out of the device are connected to spaces 57 and 58 inside the rotating drum (on the side of the rotation axis).
[081] As illustrated in Figure 7, a plurality of drum recesses 51, each having a shape that corresponds to the shape of the absorbent core 41 to be manufactured, is formed on the outer peripheral surface of the rotating drum 50 at regular intervals in the direction R1 . As illustrated in Figure 8, in the lower surface section of each drum recess are disposed: a mesh plate 52 having a number of fine holes formed therein; and air-permeable limbs 53 sparingly made of metal or resin. The air permeable members 53 are sparingly provided to protrude from the mesh plate 52, and are arranged to match the respective shapes and positions of the aforementioned low basis weight sections 44 (side grooves 44X, longitudinal grooves 44Y). Specifically, the width of each moderately air permeable limb 53 corresponding to the lateral groove 44X is formed wider than the width of the moderately air permeable limb 53 corresponding to the longitudinal groove 44Y. As illustrated in Figure 8, the regions 54 consisting only of the mesh plate 52 divided by the air-permeable members 53 sparingly so arranged constitute the sections corresponding to the respective high basis weight sections and respective high basis weight sections 43, and a region 55 consisting only of the mesh plate 52 over the entire area along the outer periphery of the section divided by the air permeable members sparingly constitutes a section corresponding to the non-block region 312. Furthermore, on the outer peripheral surface The rotating drum 50 where none is formed consists of rotating drum frame bodies 50 which are rigid bodies made of metal, and are therefore impermeable to air.
[082] As illustrated in Figure 7, the side at one end of the channel 60 covers the outer peripheral surface of the rotating drum 50 situated above the space 56 that is maintained to have a negative pressure, and the side at the other end, which is not illustrated, is provided with a fiber material introduction device. The fiber material introducing device includes, for example, a sprayer which sprays a sheet of wood pulp onto the fibrillated pulp, and which sends the fibrillated pulp (fibre material) into the channel. An absorbent polymer introducing unit for introducing an absorbent polymer is provided in the midstream line of channel 60.
[083] The transfer roller 70 has an outer peripheral part permeable to air, and the outer peripheral part rotates in the R2 direction by receiving energy from a main impeller, such as a motor. A space 71 whose internal part can be pressure-reduced is formed in the non-rotating section within the transfer roller 70 (on the side of the axis of rotation). A known exhaust device (not shown), such as an air suction fan, is connected to space 71; by actuating the exhaust device, the inner part of the space 71 can be kept under negative pressure.
[084] The vacuum box 65 is disposed between the downstream end 601 of the channel 60 and the transfer roller 70 in the rotation direction R1 of the rotating drum 50. The vacuum box 65 has a box-like shape, and a section the same opposite the rotating drum 50 is provided with an opening for the direction of the rotating drum 50. A known exhaust device (not shown), such as in the air suction fan, is connected to the vacuum box 65 by way of of an exhaust pipe 67, by actuating the exhaust device, the inner part of the vacuum box 65 can be kept in negative pressure.
[085] The 75 mesh band is a member made by continuously connecting an air-permeable band-shaped band, and moves continuously along a predetermined route being guided by a plurality of free rollers and the transfer roller. 70. The 75 mesh band is driven by the rotation of the transfer roller 70. The 75 mesh band is in contact with the outer peripheral surface of the rotating drum 50 as it passes in front of the opening in the vacuum box 65, and the band The mesh is separated from the outer peripheral surface of the rotating drum 50 and moves to the transfer roller 70 in the vicinity of a section where the transfer roller 70 and the rotating drum 50 approach each other.
[086] The vacuum conveyor 80 includes: a continuous air permeable strip 83 which is passed over a drive roller 82; and a vacuum box 84 disposed opposite the transfer roller 70 through the air permeable band 83.
[087] Next, a method for continuously manufacturing absorbent members 4 (absorbent cores 41) using the aforementioned absorbent member manufacturing device will be described.
[088] First, the spaces 56 inside the rotating drum 90 and the inside of the vacuum box 65 are reduced to negative pressures by activating the respective exhaust devices connected to them. This is done because, by reducing the inner part of the space 56 to negative pressure, an air stream is generated to transport the absorbent material 45 to the outer peripheral surface of the rotating drum 50 within the channel 60. Thereafter, the rotating drum 50 and transfer roller 70 are rotated, and vacuum conveyor 80 is driven. Then, the fiber material introducing device is actuated, and first, the fibrillated pulp (fiber material) is supplied to the channel 60. The pulp (fiber material) floats in the air stream flowing in the channel 60 and is supplied, in an air-dispersed state, towards the outer peripheral surface of the rotating drum 50.
[089] Although the drum recess 51 of the rotating drum 50 is being transported along the section covered by the channel 60, the pulp (fiber material) is sucked into the drum recess 51. As illustrated in Figure 9, the pulp ( fiber material) accumulates on mesh plate 52 in each of regions 54 and regions 55 of drum recess 51. Accumulation 410a of pulp (fiber material) formed in this manner becomes the section corresponding to pulp-only layer 410 .
[090] Then, an absorbent polymer is also provided in channel 60 while providing the fibrillated pulp (fiber material). The absorbent material 45 floats in the stream of air flowing in channel 60 and is provided, in an air-dispersed state towards the outer peripheral surface of the rotating drum 50.
[091] While the drum recess 51 of the rotating drum 50 is being transported along the section covered by the channel 60, the absorbent material 45 (a mixture of the fiber material and the absorbent polymer) is sucked into the accumulation 410a in the recess of drum 51. As illustrated in Figure 9, the absorbent material 45 gradually accumulates in the pool 410a that has already accumulated on the mesh plate 52 in each of the regions 54 and 55 of the drum recess 51, thereby providing the drum recess 51 with a accumulation 46. In the so produced accumulation 46, the amount of accumulation of the absorbent material 45 is relatively small in sections 46a (sections corresponding to the air permeable members 53 sparingly) where the absorbent material 45 accumulates on the air permeable members 53 sparingly , while the amount of accumulation of the absorbent material 45 is relatively large in other sections 46b (sections that correspond to regions 54) and sections 46c (sections that run through respond to regions 55).
[092] The rotating drum 50 is rotated, and when the drum recess 51 reaches a position opposite the vacuum box 65, the accumulation 46 in the drum recess 51 is sucked into the mesh strip 75 by sucking from the vacuum box 65. In this state, the accumulation 46 in the drum recess 51 is transported to a position immediately preceding a section where the transfer roller 70 and the rotating drum 50 approach each other, and then adjacent to the section. of closer approximation, the backlog 46 is released from the drum recess 51 by sucking on the side of the transfer roller 70 in a state where the backlog is still sucked into the mesh strip 75, and is transferred to the transfer roller 70.
[093] The accumulation 46 which has a projecting and recessed structure and which has been transferred to the transfer roller 70 along with the mesh strip 75 is then transported to a section to distribute to the vacuum conveyor 80 (i.e., the lower section of transfer roller 70) while being sucked into the mesh strip 75 on transfer roller 70, and in the dispensing section, accumulation 46 is transferred to vacuum conveyor 80 by suction from vacuum box 84.
[094] In the absorbent member manufacturing device of the present embodiment, as illustrated in Figure 7, a coating material 42, such as tissue paper or a hydrophilic non-woven cloth, is introduced into the vacuum conveyor 80 before the accumulation 46 is placed therein, and the build-up 46 is transferred to the coating material 42. Then, after wrapping the build-up 46 in the coating material 42 by folding the coating material 42 with a folding plate (not shown) the build-up 46 is wrapped in the coating material. The coating is cut at predetermined intervals, thereby continuously fabricating the absorbent member precursors 49, each to the size of a single absorbent member.
[095] In the absorbent member manufacturing device of the present embodiment, each absorbent member precursor 49 obtained as described above is compressed with a pressurizing device 90 to actively reduce the thickness of the accumulation 46 constituting the absorbent member precursor 49 of that way obtaining the desired absorbent member 4 (absorbent core 41). As illustrated in Figure 7, the pressurizing device 90 includes a pair of rollers 91, 92, wherein at least one roller has a smooth surface. The pressurizing device 90 is configured so that it can pressurize, from both the upper and lower surfaces, an article to be pressurized that has been introduced between rollers 91, 92, and compress the article in the thickness direction.
[096] When accumulation 46 is compressed by pressurizing device 90, sections 46b (the sections corresponding to regions 54) and sections 46c (the sections corresponding to regions 55) are thick and have a relatively large amount of absorbent material are compressed with greater force than sections 46a (the sections corresponding to the air permeable members 53 sparingly) which are thin and which contain a relatively small amount of the absorbent material 45. As a result, in the absorbent member 4 ( absorbent core 41) manufactured using the aforementioned manufacturing device, sections (projection sections) 46b (sections corresponding to regions 54) and sections 46c (sections corresponding to regions 55) in the accumulation 46 become the high basis weight sections 43 and the non-block region 412 which has a relatively high density in the absorbent core 41, and sections (recessed sections) 46a (the corresponding sections and to the air permeable members 53 sparingly) in the stack 46 become the low basis weight sections 44 (side grooves 44X, longitudinal grooves 44Y) which have a relatively low density in the absorbent core 41.
[097] The materials to form the disposable diaper 1 of the present embodiment will be described.
[098] For the backsheet 3 and the permanent pleat forming sheets 62, any material commonly used in absorbent articles, such as disposable diapers, can be used without particular limitation. As for the backsheet 3, it is possible to use, for example, a resin film, or a laminate of a resin film and a non-woven cloth. As for the permanent pleat forming sheets 62, it is possible to use, for example, elastic films, non-woven fabrics, textiles, or laminated sheets thereof.
[099]As for fastening tapes 7, any material normally used in absorbent articles, such as disposable diapers, can be used, without particular limitation. For example, it is possible to use, for example, a male component of a “Magic Tape (trademark)” (produced by Kuraray Fastening Co., Ltd.), a “Quicklon (trademark)” (product of YKK Corporation), a “Magicloth (trademark)” (product of Kanebo Bell Touch Co., Ltd.). or similar.
[0100] As to the absorbent core 41 constituting the absorbent member 4, it is possible to use, for example, a component in which the absorbent polymer articles are secured in an aggregate of fibers, such as pulp fibers. As for the overlay material 42 constituting the absorbent member 4, it is possible to use a hydrophilic sheet, such as a core overlay sheet made of a thin sheet of water-permeable paper (tissue paper) or water-permeable non-woven cloth.
[0101] As for the elastic members 61 to form the vertical pleats, the elastic leg members 63, q the elastic members of the waist section 64, it is possible, for example, to use a filamentous elastic material made, for example, of a rubber natura, polyurethane, a polystyrene-polyisoprene copolymer, a polystyrene-polybutadiene copolymer, or a polyethylene-α olefin copolymer, such as an ethylene ethyl acrylate.
[0102] As for the adhesive (non-skin-side absorbent member 51U, etc.), any material normally used in absorbent articles, such as disposable diapers, can be used, without particular limitations. For example, it is possible to use a hot melt adhesive. Examples of hot melt adhesives include block copolymer hot melt adhesives such as styrene - isoprene - styrene (SIS), styrene - butadiene - styrene (SBS) block copolymers, and styrene - ethylene - butylene - styrene copolymers (SEBS).
[0103] The effect of using the disposable diaper 1 according to the preceding embodiment of the present invention will be described.
[0104] As illustrated in Figures 2 and 3, diaper 1 includes a block pattern region 411 that includes lateral grooves 44X, longitudinal grooves 44Y, and high basis weight sections 43 that are oblong in the longitudinal direction (Y direction) and which are arranged in the respective sections positioned by the lateral grooves 44X and the longitudinal grooves 44Y. Using the absorbent core 41 which has such high basis weight sections 43 that are oblong in the longitudinal direction (Y direction), when a wearer wearing the diaper 1 excretes body fluid, the body fluid will likely flow in the longitudinal direction (direction Y). Furthermore, as illustrated in Figures 2 and 3, in the absorbent core 41 of the absorbent member 4 provided in the diaper 1, the thickness of the lateral groove 44X is the same as or thinner than the thickness of the longitudinal groove 44Y, and the width of the 44X lateral groove is wider than the width of the 44Y longitudinal groove in a planar view. Therefore, as illustrated in Figure 10, body fluid is more likely to flow along lateral grooves 44X than longitudinal grooves 44Y. Therefore, it is likely that body fluid airflow in the longitudinal direction (Y direction) due to the high basis weight sections 43 that are long in the longitudinal direction (Y direction) of the block pattern region 411, and, in addition, due to the 44X lateral grooves, body fluid is likely to air flow in the lateral direction (X direction) along the 44X lateral grooves, and therefore the body fluid can be efficiently diffused over a wide area of the absorbent member 4 , as illustrated in Figure 10. Therefore, it is possible to efficiently use the absorbent capacity over a wide area of the absorbent member 4. Particularly, in this diaper 1, as illustrated in Figure 3, the skin-facing side of the absorbent core 41 it is flat, and the side of the surface which is not opposite the skin of the absorbent core 41 has the projection sections which project from the side of the topsheet 2 towards the side of the backsheet 3; and the undercut sections which are undercut from the side of the backsheet 3 towards the side of the topsheet 2. Therefore, the above-mentioned effect is also accentuated.
[0105] Furthermore, in this diaper 1, as illustrated in Figure 5, the absorbent member includes a block pattern region 411 and a non-block region 412, and the entire width WA of the absorbent core 41 in the side section. stomach A is the same as the entire width WB of the same in the rear section B, and the width WA1 of the block pattern region 411 in the stomach side section A is the same as the width WB1 of the same in the rear section B. In addition Furthermore, as illustrated in Figures 2 and 5, the non-block region 412 as a whole is formed into a shape in which a section of the central section in the longitudinal direction (Y direction) towards the stomach side section A is narrowed inwards, and the total area of the back section B is greater than the total area of the stomach side section A. Therefore, the body fluid can be efficiently diffused over the absorbent core 41 in the back section B in cases where the diaper 1 is used particularly for a newborn, in which case the diaper is used with the baby lying on his back.
[0106] Furthermore, in this diaper 1, as illustrated in Figure 3(a), the adhesive of the non-skin side absorbent member 51U to join the liner material 42 and the surface that is not opposed to the skin 41U of the core absorbent 41 is applied intermittently in the lateral direction (X direction) of the diaper 1, and straight lines in the longitudinal direction (Y direction). As the adhesive of the non-skin-side absorbent member, the non-skin-side absorbent core 51U is applied in straight lines in the longitudinal direction (Y direction) on the absorbent core 41 which includes the high basis weight sections 43 which are oblong in the longitudinal direction (Y direction), when the diaper 1 wearer excretes body fluid, the flow of body fluid is regulated, and will likely flow in the longitudinal direction (Y direction).
[0107] Furthermore, in the diaper 1, as illustrated in Figure 3, the pulp-only layer 410 is formed on the side of the absorbent core 41 on the side more towards the surface not opposite the skin. Therefore the body fluid can be homogeneously transferred within the absorbent core 41, and it is possible to achieve the effect that the body fluid can be efficiently diffused over a wide area of the absorbent member 4, and that efficient use can be made of the absorbent capacity over a wide area of the absorbent member 4.
[0108] In addition, on this diaper 1, as illustrated in Figure 3, the topsheet 2 has several projections 21 that protrude towards the side of the surface opposite the skin, and recesses 22 adjacent to the projections 21, and the side of the surface opposite the skin of the top sheet 2 has a protruding and recessed structure. Therefore, gaps can be created between the wearer's skin and the topsheet 2 even if the wearer wearing the diaper has excreted bodily fluid, thereby improving air permeability and pleasantness to the touch.
[0109] In addition, in this diaper 1, as illustrated in Figure 3, the intermediate sheet 5 (underlayer sheet) is disposed between the top sheet 2 and the coating material 42, and therefore it is possible to achieve the transfer effect of homogeneous fluid to the absorbent member 4.
[0110] The disposable diaper, which is one embodiment of an absorbent article of the present invention, is not limited to the disposable diaper of the aforementioned embodiment, and modifications may be made as appropriate.
[0111] For example, in the disposable diaper 1 of the preceding embodiment, the non-skin surface side of the absorbent core 41 has the projection sections that project from the side of the topsheet 2 to the backsheet 3, and the recessed sections which are recessed from the backsheet 3 to the side of the topsheet 2, as illustrated in Figure 3. The side of the surface not opposite the fur, however, may be flat.
[0112] In addition, in the disposable diaper 1 of the preceding modality, the hydrophilic intermediate sheet 5 is disposed between the absorbent member 4 and the topsheet 2, as shown in Figure 3. The intermediate sheet 5, however, need not be provided.
[0113] Furthermore, as illustrated in Figure 4, in the disposable diaper 1 of the aforementioned modality: the top sheet 2 includes the first layer 23 and the second layer 24 which are sheet-forming articles; the first layer 23, which constitutes the surface opposite the skin of the topsheet 2, has a plurality of projections 21, each projection towards the side of the surface opposite the skin and having a hollow inner part; and a second layer 24, which constitutes the non-skin surface of the topsheet 2, has a planar shape. In place of this topsheet 2, it is possible to use the flat non-woven cloth generally used in absorbent articles such as disposable diapers, or, as illustrated in Figure 11, it is possible to use a topsheet 2 that is made of a single layer of aggregate. fiber, wherein the respective inner parts of the projections 21 are solid and the projections 21 and the recesses 22 are alternately arranged in the longitudinal direction (Y direction) and are alternately aligned also in the lateral direction (X direction).
[0114] Furthermore, in place of the above-mentioned topsheet 2, it is possible to use, as the topsheet, a projecting and recessed sheet made by: layering a first fiber layer that includes fibers that are shrunk to hot, and a second fiber layer including fibers that substantially do not heat shrunk or fibers that substantially do not heat shrink at a temperature at which the fibers that are heat shrunk begin to shrink; partially joining the first and second layers, and then shrinking the first fiber layer by hot air treatment. On this topsheet, the second fiber layer forms projections that protrude into different sections than the joining sections with the first fiber layer, and the joining sections form recesses. Fibers which are heat shrunk are preferably self-shrinking fibers. The sheets described, for example, in JP 2002-187228 A, JP203-250836 A, JP2004-166849 A, and JP2004-202890 A can be used as the projecting and recessed sheet.
[0115] Furthermore, in the disposable diaper 1 of the aforementioned modality, the absorbent core 41 of the absorbent member 4 includes the block pattern region 411 formed in a rectangular shape that is oblong in the longitudinal direction (Y direction), and the region other than block 412 disposed along the outer periphery of block pattern region 411 as illustrated in Figures 2 and 5. In place of the aforementioned absorbent core 41 of absorbent member 4, it is possible to provide an absorbent core 41A to 41D, as illustrated in Figures 12 to 15. The detailed description of the absorbent core 41 provided in the aforementioned diaper 1 applies as appropriate to aspects which are not particularly described with respect to the absorbent cores 41A to 41D illustrated in Figures 12 to 15. in Figures 12 to 15, members that are the same as those in Figure 5 are accompanied by the same reference signs. Each absorbent core 41A through 41D illustrated in Figures 12 through 15 includes: a block pattern region 411 formed in a shape in which both side edges on stomach side section A and both side edges on back section B extend outward in the lateral direction (X direction) rather than both lateral edges in the C genitalia section, and where, as a whole, the central section in the longitudinal direction (Y direction) is narrowed inward; and the non-blocking region 412 formed in a shape in which the center section in the longitudinal direction (Y direction) is narrowed inward. Alternatively, in place of the aforementioned absorbent core 41 of the absorbent member 4, it is possible to use an absorbent core which does not have a non-blocking region 412, and wherein the plurality of linear lateral grooves 44X are formed to extend over the entire length of the lateral direction (X direction) and the plurality of linear 44Y longitudinal grooves are formed so as to extend over the entire length in the longitudinal direction (Y direction).
[0116] The block pattern region 411 of the absorbent core 41A illustrated in Figure 12 will be described in greater detail. As illustrated in Figure 12, in this absorbent core 41A, four rows of block structures are evenly disposed in the longitudinal direction (Y direction) in the back section 411b of the block pattern region 411, each of these structures including five basis weight sections high 43 - which are positioned by the lateral grooves 44X and the longitudinal grooves 44Y - regularly arranged in the lateral direction (X direction). Furthermore, as illustrated in Figure 12, in the genitalia section 411c of the block pattern region 411, seven rows of block structures are arranged evenly in the longitudinal direction (Y direction), each of these block structures including three weight sections of high base 43, arranged evenly in the lateral direction (direction X). Furthermore, as illustrated in Figure 12, in the stomach side section 411a of the block pattern region 411, four rows of block structures are arranged evenly in the longitudinal direction (Y direction), each of these block structures including five sections of high basis weight 43 - which are divided by the 44X lateral grooves and the 44Y longitudinal grooves - arranged evenly in the lateral direction (X direction). As illustrated in Figure 12, the block pattern region 411 in this absorbent core 41A, four of the six longitudinal grooves 44Y extending in the longitudinal direction (direction Y) are arranged as straight lines extending from the stomach side section A to the rear section B.
[0117] The block pattern region 411 of the absorbent core illustrated in Figure 13 will be described in detail. As illustrated in Figure 13, in this absorbent core 41B, four rows of block structures are evenly disposed in the longitudinal direction (Y direction) in the back section 411b of the block pattern region 411, each of these block structures including four weight sections high base 43 - which are divided by lateral grooves 44X and longitudinal grooves 44Y - arranged evenly in the lateral direction (X direction). Furthermore, as illustrated in Figure 13, in the genitalia section 411c of the block pattern region 411, seven rows of block structures are arranged evenly in the longitudinal direction (Y direction), each of these block structures including three weight sections of high base 43 - which are divided by the lateral grooves 44X and the longitudinal grooves 44Y - arranged evenly in the lateral direction (X direction). Furthermore, as illustrated in Figure 13, in the stomach side section 411a of the block pattern region 411, four rows of block structures are arranged evenly in the longitudinal direction (Y direction), each of these block structures including four sections. of high basis weight 43 - which are divided by the 44X lateral grooves and the 44Y longitudinal grooves - arranged evenly in the lateral direction (X direction). As illustrated in Figure 13, in the block pattern region 411 of this absorbent core 41B, none of the longitudinal grooves 44Y extending in the longitudinal direction (Y direction) are arranged as straight lines extending from the stomach side section to the section. rear B.
[0118] The block pattern region 411 of the absorbent core 41C illustrated in Figure 14 will be described in detail. As illustrated in Figure 14, in this absorbent core 41C, in the rear section 411b of the block pattern region 411: three rows of block structures are arranged evenly in the longitudinal direction (Y direction), each of these structures including five weight sections of high base 43 - which are divided by the 44X lateral grooves and the 44X lateral grooves - regularly arranged in the lateral direction (X direction); and, furthermore, a row of block structure which includes four high basis weight sections 43 arranged evenly in the lateral direction (X direction) is evenly arranged in the longitudinal direction (Y direction). Furthermore, as illustrated in Figure 14, in the genitalia section 411c of the block pattern region 411, seven rows of block structures are arranged evenly in the longitudinal direction (Y direction), each of these structures including three base weight sections high 43 - which are divided by the 44X lateral grooves and the 44X lateral grooves - arranged evenly in the lateral direction (X direction). Furthermore, as illustrated in Figure 14, in the stomach side section 411a of the block pattern region 411: a row of block structure is arranged evenly in the longitudinal direction (Y direction), this block structure including four weight sections high base 43 - which are divided by lateral grooves 44X and longitudinal grooves 44Y - regularly arranged in the lateral direction (X direction); and, in addition, three rows of block structures each including five high basis weight sections 43 arranged evenly in the lateral direction (X direction) and evenly arranged in the longitudinal direction (Y direction). As illustrated in Figure 14, in the block pattern region 411 of this absorbent core 41C, none of the longitudinal grooves 44Y extending in the longitudinal direction (Y direction) are arranged as straight lines extending from the stomach side section to the section. rear B.
[0119] The block pattern region 411 of the absorbent core 41D illustrated in Figure 15 will be described in greater detail. As illustrated in Figure 15, in this absorbent core 41D, in the rear section 411b of the block pattern region 411: three rows of block structures are arranged evenly in the longitudinal direction (Y direction), each of these block structures including six sections of high base weight 43 - which are divided by the 44X lateral grooves and the 44Y longitudinal grooves - arranged evenly in the lateral direction (X direction); and, furthermore, a row of the block structure including four high basis weight sections 43 arranged evenly in the lateral direction (X direction) is evenly arranged in the longitudinal direction (Y direction). Furthermore, as illustrated in Figure 15, in the genitalia section 411c of the block pattern region 411, seven rows of block structures are arranged evenly in the longitudinal direction (Y direction), each of these block structures including two weight sections high base 43 - which are divided by lateral grooves 44X and longitudinal grooves 44Y - arranged evenly in the lateral direction (X direction). Furthermore, as illustrated in Figure 15, in the stomach side section 411a of the block pattern region 411: a row of block structure is arranged evenly in the longitudinal direction (Y direction), this block structure including four weight sections high base 43 - which are divided by lateral grooves 44X and longitudinal grooves 44Y - regularly arranged in the lateral direction (X direction); and, in addition, three rows of block structures each including six high basis weight sections 43, arranged evenly in the lateral direction (X direction) are evenly arranged in the longitudinal direction (Y direction). As illustrated in Figure 15, in the block pattern region 411 of this absorbent core 41D, three of the seven longitudinal grooves 44Y extending in the longitudinal direction (direction Y) are arranged as straight lines extending from the stomach side section A to the rear section B.
[0120] Furthermore, in the disposable diaper 1 of the aforementioned embodiment, the low basis weight sections 44 in the absorbent core 41 constituting the absorbent member 4 are formed in a lattice pattern as a whole by the linear 44X extending lateral grooves in the lateral direction (X direction) and the linear 44Y longitudinal grooves that extend in the longitudinal direction (Y direction) as illustrated in Figure 2. The pattern, however, is not limited to the aforementioned truss pattern.
[0121] Furthermore, the disposable diaper of the aforementioned modality is an open-type disposable diaper as illustrated in Figure 1. The diaper, however, may be a wearable disposable diaper.
[0122] The following absorbent articles are also described with respect to the aforementioned embodiments.
[0123]<1> An absorbent article including a topsheet disposed on a surface side opposite the skin, a backsheet disposed on a surface side not opposed to the skin, and a long absorbent member disposed longitudinally between the topsheet and the backsheet, wherein: the absorbent member includes an absorbent core that includes an absorbent polymer; the absorbent core includes a block pattern region that includes: longitudinal grooves extending in the longitudinal direction of the absorbent article; lateral grooves extending in the lateral direction of the absorbent article; and a plurality of longitudinally disposed long high basis weight sections in the respective sections divided by the longitudinal grooves and the lateral grooves, each of the high basis weight sections having a high basis weight instead of the sections located in the longitudinal grooves and the grooves. sides; the high basis weight sections of the absorbent core are integrally formed with the low basis weight sections made up of the sections located in the longitudinal grooves and in the lateral grooves, and the lateral groove thickness is the same as or thinner than the thickness of the longitudinal groove, and the width of the lateral groove is wider than the width of the longitudinal groove in a planar view.
[0124] <2> The absorbent article according to clause <1>, wherein: the side of the surface opposite the skin of the absorbent core is flat; and the non-skin surface side of the absorbent core has projecting sections that protrude from the topsheet 2 to the backsheet, and recessed sections that are recessed from the backsheet to the topsheet 2.
[0125]<3> The absorbent article according to clause <1> or <2>, wherein: the absorbent core includes the block pattern region, and a non-block region disposed along an outer periphery from the block pattern region; the entire width of the absorbent core in a stomach side section is the same as the entire width in the rear section; and the width of the block pattern region is the same in the stomach side section and the back section.
[0126]<4> The absorbent article according to any one of clauses <1> to <3>, wherein: the absorbent member includes the absorbent core, and a coating material surrounding the absorbent core; the coating material and the non-skin surface of the absorbent core are joined by an absorbent member adhesive on the non-skin side; and the non-skin side absorbent member adhesive is applied intermittently in the lateral direction of the absorbent article, and in straight lines in the longitudinal direction.
[0127]<5> The absorbent article according to any one of clauses <1> to <4>, wherein the absorbent core has a pulp-only layer formed on the side furthest away from the non-skin surface.
[0128]<6> The absorbent article according to any one of clauses <1> to <5> wherein the topsheet 2 has several projections which protrude to the side of the surface opposite the skin, and recesses adjacent to the projections, and the side of the surface opposite the skin of the topsheet 2 has a projecting and recessed structure.
[0129]<7> The absorbent article according to any one of clauses <1> to <6>, wherein a hydrophilic intermediate sheet is disposed between the absorbent member and the topsheet 2.
[0130]<8> The absorbent article according to any one of clauses <1> to <7>, wherein: the side edges of the stomach side section and the side edges of the rear section extend further out in the direction lateral than the lateral edges of the genitalia section; the lateral edges of the genitalia section are arched inwardly in the lateral direction, and the absorbent article as a whole thus has a shape that is narrowed inwardly at the central section in the longitudinal direction; the topsheet 2 and the backsheet extend outwardly from the side edges and the leading and trailing edges of the absorbent member; and the dimension of the topsheet 2 in the lateral direction is less than the dimension of the backsheet in the lateral direction.
[0131]<9> The absorbent article according to any one of clauses <1> to <8>, wherein: on the respective lateral sections of the absorbent article along the longitudinal direction, vertical pleating sheets, each having members fixed along the longitudinal direction in its stretched state, are arranged in and fixed on the respective side sections of the topsheet 2, and thereby a pair of vertical pleats is formed in each of the side sections of the absorbent article along the direction. longitudinally, a plurality of elastic leg members to form leg creases are disposed along the longitudinal direction in its stretched state, and thereby the leg creases are formed by the contraction of the elastic leg members; and the longitudinal end section on the rear section side of the absorbent article, elastic waist section members for forming waist pleats are arranged along the lateral direction in its stretched state, and thereby the waist pleats are formed by the contraction of the elastic waist members.
[0132]<10> The absorbent article according to clause <4>, wherein the absorbent member is formed by covering the absorbent core, which is oblong in the longitudinal direction and can retain liquid, with the coating material which is a liquid-permeable hydrophilic sheet.
[0133] <11> The absorbent article according to any one of clauses <1> to <10>, wherein the block pattern region of the absorbent core is formed in a lattice pattern as a whole by the side grooves and the longitudinal grooves, and is formed so that the high basis weight sections are arranged in respective sections divided by linear lateral grooves and longitudinal grooves.
[0134]<12> The absorbent article according to any one of clauses <1> to <11>, wherein the absorbent core includes low basis weight sections comprising the lateral grooves and the longitudinal grooves; the high basis weight sections of the absorbent core are integrally formed with the low basis weight sections; and the non-block region is also formed integrally with the high basis weight sections and the low basis weight sections.
[0135]<13> The absorbent article according to clause <11>, wherein: in the absorbent core, the low basis weight sections are unevenly distributed on the topsheet 2 in the direction of the thickness of the absorbent article; and the topsheet 2 of the absorbent core is flat.
[0136]<14> The absorbent article according to any one of clauses <1> to <13>, wherein: the entire length of the absorbent core in its longitudinal direction is from 250 mm to 550 mm inclusive; and the entire width of the absorbent core in the lateral direction is from 50mm to 200mm inclusive.
[0137]<15> The absorbent article according to any one of clauses <1> to <14>, wherein the extent of the block pattern region in its longitudinal direction is 70% to 98% inclusive, or 85 % to 95% inclusive, with respect to the entire length of the absorbent core in the longitudinal direction.
[0138]<16> The absorbent article according to any one of clauses <1> to <15>, wherein the extent of the block pattern region in its lateral direction is 30% to 90% inclusive, or 50 % to 70% inclusive, with respect to the entire width of the absorbent core in the lateral direction.
[0139]<17> The absorbent article according to any one of clauses <1> to <16>, wherein: the entire extent of the block pattern region in the longitudinal direction is from 100mm to 540mm inclusive; and the entire length of the block pattern region in the lateral direction is from 20 mm to 140 mm inclusive.
[0140]<18> The absorbent article according to any one of clauses <3> to <17>, wherein the extension, in the longitudinal direction, of each of the end sections, in the longitudinal direction, of the non-block region is from 10mm to 150mm inclusive.
[0141]<19> The absorbent article according to any one of clauses <3> to <18>, wherein the extension, in the lateral direction, of each of the side sections of the non-block region extending along the longitudinal direction is: from 10 mm to 40 mm including stomach side section A; from 10 mm to 30 mm including in the second layer; and from 10 mm to 40 mm including in the rear section.
[0142]<20> The absorbent article according to any one of clauses <1> to <19>, wherein: each high basis weight section is formed into a rectangular shape in a planar view; or the four corners of each high basis weight section are arc-shaped; or each high basis weight section is polygonal or elliptical, or a combination thereof.
[0143] <21> The absorbent article according to any one of clauses <1> to <20>, wherein: the width of the lateral groove 44X is wider than the width of the longitudinal groove; and the ratio of the lateral groove width to the longitudinal groove width, ie, the lateral groove width / the longitudinal groove width, is from 110% to 500% inclusive, or from 120% to 300% inclusive.
[0144]<22> The absorbent article according to any one of clauses <1> to <21>, wherein the width of the lateral groove 44X with respect to the extension of the high basis weight section in the longitudinal direction is 2% 25% inclusive, or 5% to 20% inclusive.
[0145]<23> The absorbent article according to any one of clauses <1> to <22>, wherein the width of the longitudinal groove with respect to the extension of the high basis weight section in the lateral direction is 2% to 30% inclusive, or 10% to 25% inclusive.
[0146]<24> The absorbent article according to any one of clauses <12> to <23>, wherein: the thickness of the lateral groove is the same as the thickness of the longitudinal groove; and the thickness of the low basis weight section with respect to the thickness of the high basis weight section 43 is from 30% to 90% inclusive.
[0147]<25> The absorbent article according to any one of clauses <12> to <24>, wherein the basis weight of the low basis weight section with respect to the basis weight of the high basis weight section is from 20% to 80% inclusive, or from 30% to 70% inclusive.
[0148]<26> The absorbent article according to any one of clauses <12> to <25>, wherein the absorbent member; the high basis weight sections and the non-block region are formed to have the same density as or higher density than the low basis weight sections.
[0149]<27> The absorbent article according to any one of clauses <12> to <26>, wherein the density of the low basis weight section with respect to the density of the high basis weight section is 50% at 00% inclusive, or from 75% to 95% inclusive.
[0150]<28> The absorbent article according to any one of clauses <12> to <27>, wherein spaces are formed between the liner material and the respective low basis weight sections of the absorbent core.
[0151]<29> The absorbent article according to any one of clauses <7> to <28>, wherein the rectangular intermediate sheet which is oblong in the longitudinal direction is disposed between the top sheet 2 and the lining material it constitutes the absorbent member.
[0152]<30> The absorbent article according to any one of clauses <7> to <29>, wherein the intermediate sheet is an underlayer sheet, and is arranged from the stomach side section to the back section so as to cover the absorbent core consisting of the absorbent member; and the base weight of the intermediate sheet is from 15 g/m2 to 100 g/m2 inclusive.
[0153] <31> The absorbent article according to clause <30>, wherein: a main sheet made of hydrophilic fibers (a sheet in which the hydrophilic fiber material is preferably 90% by mass or more) is used as the middle sheet; and paper, a non-woven cloth, or a weft is used as the sheet made mainly of hydrophilic fibers.
[0154]<32> The absorbent article according to any one of clauses <1> to <31>, wherein the absorbent article is an open type disposable diaper.
[0155]<33> The absorbent article according to any one of clauses <7> to <31>, wherein the absorbent article is a disposable wearable diaper. Examples
[0156] The present invention will be described in more detail below according to the Examples. For example, however, is not limited in any way by the Examples which are within the scope of the invention. Example 1
[0157] An absorbent member 4 was manufactured using the device illustrated in Figure 7, and a disposable diaper 1 was illustrated in Figure 2 was prepared. The topsheet 2 will be described in detail. A sheet provided with substantially the same structure as the projection top sheet 2 and which is recessed in two layers illustrated in Figure 4 was used as the top sheet. A non-woven, liquid-permeable air pass cloth having a basis weight of 18 g/m2 was used for the top layer and the lower layer of the top sheet, and for the top layer, the non-woven air pass cloth has undergone a relief process to provide projections and indentations. The base weight of the upper layer after being provided with the projections and recesses was 23.5 g/m2. On the top sheet 2, the projections 21 and the joining sections 25 (recesses 22) were arranged in a stepped pattern, the height h of the projection 21 was 1.1 mm, the lower dimension L1 of the projection 21 along the Y direction was 2.5 mm, the lower L2 dimension of the 21 projection along the X direction was 3.0 mm, and the lower area of the 21 projection was 7.5 mm2. In addition, the extension L3 of the joining section at recess 22 in the X direction, as well as its extension in the Y direction, was 1.0 mm.
[0158] Next, the absorbent member 4 will be described in detail. The entire length, in the Y direction, of the block pattern region 411 of the absorbent core 41 was 332 mm, and the entire width thereof in the X direction was 50 mm. As for the non-block region 412 of the absorbent core 41, the Y direction extension of the end section in the Y direction was 370 mm, the X direction extension of the side section in the stomach side section A was 120 mm, the X direction extension of the lateral section in the genitalia section C was 70 mm, and the X direction extension of the lateral section in the rear section B was 100 mm. The length of the Y L4 direction of each high basis weight section 43 constituting the block pattern region 411 was 20 mm, and the length of the X L5 direction thereof was 10 mm. The width L6 of each lateral groove 44X constituting the block pattern region 411 was 2.2 mm, and the width L7 of each longitudinal groove 44Y was 2 mm. The basis weight of each low basis weight section 44 (side groove 44X, longitudinal groove 44Y) constituting the block pattern region 411 was 292 g/m2, and the basis weight of each of the weight sections of base high 43 constituting the block pattern region 411, as well as the non-block region 412, was 570 g/m2.
[0159] Next, the sticker will be described in detail. The density (i.e. the application amount) for applying a 51T skin side absorbent core adhesive, which was applied in a spiral pattern, was 2.5 g/cm3, and the density (i.e., the amount of application) to apply the 51U non-skin side absorbent member adhesive, which was applied in a stripe pattern, was 2.0 g/cm3. Example 2
[0160] A disposable diaper according to Example 2 was prepared in the same manner as Example 1, except that, in Example 2, the width L6 of each lateral groove 44X that constitutes the block pattern region 411 was 2.5 mm, and the width L7 of each longitudinal groove 44Y was 2 mm. Comparative Example 1:
[0161] A disposable diaper according to Comparative Example 1 was prepared in the same manner as Example 1, except that, with respect to the absorbent core 31 of the absorbent member 4, the width L6 of each lateral groove 44X that constitutes the region of block pattern 411 was 1 mm, and the width L7 of each longitudinal groove 44Y was 2 mm. Performance evaluation
[0162] The absorption time of the diffusion area of the disposable diapers according to Examples 1 and 2 and Comparative Example 1 was measured according to the following method. The evaluation environment was 20°C (room temperature) and 60% RH. The measurement results are illustrated in Table 1 below. Method for Measuring Absorption Time and Diffusion Area
[0163] The tip end of a cylinder (with an internal diameter of 19.5 mm; an upper section 10 mm in length thereof that contacts the absorbent member had an internal diameter of 10 mm) was placed in contact with the topsheet 2 of each disposable diaper obtained in Examples 1 and 2 and in Comparative Example 1, in a manner so as to correspond to the block pattern region 411 of the absorbent core 41, and the cylinder was lifted perpendicularly. Then, a weight was placed so that a load of 21.6 g/cm2 was applied to the top sheet 2 around the perpendicularly erected cylinder. Then, 30 g of a physiological saline solution (0.9% by weight sodium chloride solution) was supplied from the other end of the cylinder, and the absorption time (seconds) until the saline solution was measured. physiological was no longer visible in the surface material inside the cylinder. In addition, 10 minutes after delivery of the physiological saline solution, the diffusion area (cm2) was measured. It should be noted that the measurement was performed on the three samples per diaper, and the average of the measured values was completed and illustrated in Table 1.

[0164] As is clear from the results illustrated in Table 1, it was concluded that the disposable diapers of Examples 1 and 2 had shorter absorption times (seconds) and wider diffusion areas (cm2) than the disposable diaper of the Comparative Example 1. Therefore, it is inferred that the disposable diapers of Examples 1 and 2 can make efficient use of the absorbent capacity over a wide area of the absorbent member 4, compared to the disposable diaper of Comparative Example 1. Industrial Applicability
[0165] According to the absorbent article of the present invention, body fluid can be efficiently diffused over a wide area of an absorbent member, and efficient use can be made of the absorbent capacity over a wide area of the absorbent member.

权利要求:
Claims (7)
[0001]
1. Absorbent article comprising a topsheet disposed on a surface side opposite the skin, a backsheet disposed on a surface side not opposed to the skin, and a longitudinally long absorbent member disposed between the topsheet and the backsheet. in that: the absorbent member includes an absorbent core that includes an absorbent polymer; the absorbent core includes a block pattern region that includes: longitudinal grooves extending in the longitudinal direction of the absorbent article, lateral grooves extending in the lateral direction of the absorbent article; and a plurality of longitudinally long high basis weight sections disposed in respective sections divided by the longitudinal grooves and the side grooves, each of the high basis weight sections having a higher basis weight than the sections located in the longitudinal grooves and in the lateral grooves; and the thickness in the lower section of the lateral groove is the same as or thinner than the thickness in the lower section of the longitudinal groove, and the width of the lateral groove is wider than the width of the longitudinal groove in a planar view.
[0002]
2. Absorbent article, according to claim 1, CHARACTERIZED by the fact that: the side of the surface opposite the skin of the absorbent core is flat; and the non-skin side of the absorbent core has projecting sections that project from the side of the topsheet towards the side of the backsheet, and recessed sections that are recessed from the side of the backsheet towards the side of the top sheet.
[0003]
3. Absorbent article according to claim 1 or 2, CHARACTERIZED in that: the absorbent core includes the block pattern region, and a non-block region disposed along an outer periphery of the pattern region in block; the entire width of the absorbent core at a stomach side section is the same as the entire width of it at a rear side section; and the width of the block pattern region is the same in the stomach side section and the back side section.
[0004]
4. Absorbent article, according to any one of claims 1 to 3, CHARACTERIZED by the fact that: the absorbent member includes the absorbent core, and a coating material that surrounds the absorbent core; the coating material and the non-skin surface of the absorbent core are joined by an absorbent member adhesive on the non-skin side; and the non-skin side absorbent member adhesive is applied intermittently in the lateral direction of the absorbent article, and in straight lines in the longitudinal direction.
[0005]
5. Absorbent article, according to any one of claims 1 to 4, CHARACTERIZED by the fact that the absorbent core has a layer only of pulp formed on the side more facing the surface not opposite the skin.
[0006]
6. Absorbent article, according to any one of claims 1 to 5, CHARACTERIZED by the fact that the topsheet has a multiplicity of projections that project towards the side of the surface opposite the skin, and the recesses adjacent to the projections, and the surface side opposite the skin of the topsheet has a projection and recessed structure.
[0007]
7. Absorbent article, according to any one of claims 1 to 6, CHARACTERIZED by the fact that a hydrophilic intermediate sheet is disposed between the absorbent member and the topsheet.

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BR112019012060A2|2020-03-10|ABSORBENT LAMINATES, ABSORBENT CORE AND DISPOSABLE ITEMS USING ABSORBENT LAMINATES AND RELATED METHODS

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TWM540622U|2017-05-01|Absorbent article

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JP6219701B2|2017-10-25|Absorbent articles

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JP2013255550A|2013-12-26|Absorbent article

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RU2705608C1|2019-11-11|Absorbent article

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BR112013012125B1|2020-02-27|METHOD FOR THE MANUFACTURE OF DISPOSABLE DRESSING ITEM

同族专利:

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公开号 | 公开日

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CN104349759B|2017-12-26|

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TWI566758B|2017-01-21|

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JP2013255557A|2013-12-26|

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TW201402097A|2014-01-16|

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RU2631646C2|2017-09-25|

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RU2014152702A|2016-07-27|

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BR112014027238A2|2017-06-27|

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CN104349759A|2015-02-11|

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WO2013187260A1|2013-12-19|

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JP6099239B2|2017-03-22|

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JP3406214B2|1998-01-30|2003-05-12|ユニ・チャーム株式会社|Disposable diapers|

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US6459016B1|1999-12-23|2002-10-01|Mcneil-Ppc, Inc.|Absorbent article with multiple high absorbency zones|

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JP4738101B2|2005-08-29|2011-08-03|花王株式会社|Absorbent sheet|

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KR101515518B1|2007-08-28|2015-04-27|가오 가부시키가이샤|Shaped sheet and absorbent article utilizing the same|

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JP5180660B2|2007-11-02|2013-04-10|花王株式会社|Absorbent articles|

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JP5199646B2|2007-11-16|2013-05-15|ユニ・チャーム株式会社|Absorbent articles|

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RU2555615C2|2009-05-20|2015-07-10|Као Корпорейшн|Absorbing body and absorbing product|

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JP5451179B2|2009-05-20|2014-03-26|花王株式会社|Absorber and absorbent article|JP5800959B1|2014-06-23|2015-10-28|ユニ・チャーム株式会社|Disposable diapers|

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JP6285812B2|2014-06-30|2018-02-28|ユニ・チャーム株式会社|Disposable diapers|

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JP6674205B2|2014-10-20|2020-04-01|花王株式会社|Pants-type disposable diapers|

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WO2016063638A1|2014-10-20|2016-04-28|花王株式会社|Underwear-type disposable diaper|

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CN107106384A|2015-01-23|2017-08-29|金伯利-克拉克环球有限公司|The absorbing structure of bridge joint|

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JP6198076B2|2015-09-25|2017-09-20|大王製紙株式会社|Absorbent articles|

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JP6234492B2|2016-02-10|2017-11-22|大王製紙株式会社|Pad type disposable diaper|

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JP6250719B2|2016-02-29|2017-12-20|大王製紙株式会社|Disposable diapers|

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JP6320467B2|2016-07-08|2018-05-09|ユニ・チャーム株式会社|Absorbent articles|

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JP6568182B2|2017-11-24|2019-08-28|大王製紙株式会社|Absorbent articles|

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JP2019209120A|2018-06-05|2019-12-12|花王株式会社|Absorbent article|

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JP6494889B1|2018-07-05|2019-04-03|花王株式会社|Absorbent articles|

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CN110179594A|2019-05-31|2019-08-30|重庆百亚卫生用品股份有限公司|A kind of absorption-type core|

法律状态:
2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-12-24| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-06-01| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-07-20| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 31/05/2013, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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JP2012131859A|JP6099239B2|2012-06-11|2012-06-11|Absorbent articles|

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JP2012-131859|2012-06-11|

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PCT/JP2013/065268|WO2013187260A1|2012-06-11|2013-05-31|Absorbent article|

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