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    • 专利摘要:
    The present invention relates to a laminate suitable for absorbent articles. More specifically, the invention relates to an elastic laminate consisting of three layers (an elastic film sandwiched between two non-woven webs) bonded together, preferably by mechanical bonding, to methods of making the above elastic laminate, as well as to the use of an elastic laminate according to the invention in an absorbent article, in particular a pants diaper. The elastic laminate preferably consists of better stretchability and / or softness, leading to improved comfort and comfort for the wearer. The present invention is of particular interest in the field of disposable hygiene products, especially pant diapers.
    公开号:BE1022196B1
    申请号:E2014/5060
    申请日:2014-11-07
    公开日:2016-02-26
    发明作者:Goethem Jeroen Van
    申请人:Ontex Bvba；
    IPC主号:
    专利说明:

    IMPROVED EXTENSIVE LAMINATE TECHNICAL AREA
    The present invention relates to a laminate suitable for absorbent articles. More specifically, the invention is related to an elastic laminate consisting of at least two and preferably at least three layers, such as an elastic film sandwiched between two non-woven webs, bonded to each other, on methods of manufacturing the above-mentioned elastic laminate, as well as a use of an elastic laminate according to the invention in an absorbent article, in particular a pant diaper. Such an elastic laminate provides improved stretchability, softness, formability and thus comfort for the wearer. The present invention is of particular interest in the field of disposable hygiene products, in particular diapers, and more particularly pants-type diapers.
    BACKGROUND
    The absorbent articles that have defined core areas and chassis areas are believed to have a comfortable fit around the wearer. For pants articles such as pants diapers, sanitary pants diapers and incontinence pants diapers, it is also desirable that the articles can be pulled on and off over the wearer's hips to allow the wearer or caregiver to easily put on and remove the article when it is soiled . It is so known to make such absorbent pants diapers with elastic stretchable side panels and waist portion, usually consisting of elastic members, such as elastic threads, which are stretchably bonded between backsheet and topsheet.
    It is further known to make portions of the chassis from absorbent articles of an elastic material, such as tensile bonded laminates. Such laminates can include an elastic film layer that is sandwiched between outer layers of non-woven webs. More specifically, the elastic film is typically bonded to the non-woven web to form the elastic elastic laminate.
    Efforts have been made to improve the stretchability of the above absorbent article; however, there is still room for improvement with regard to comfort, fit and textile-like feel of absorbent articles. Furthermore, the use of adhesives such as glue is still commonplace in the production of absorbent articles which should preferably be impeded due to environmental issues. Furthermore, the use of adhesives in high volume production of absorbent articles leads to increased costs and is therefore preferably limited or avoided altogether.
    Pat. Nr. US 8,052,665 B2 discloses an absorbent article consisting of an elastic laminate. A problem with such an absorbent article is that the stretchability support expectations are not filled with such an absorbent article because the elastic laminate is rigid. Furthermore, the layers of the elastic laminate are bonded with a pressure sensitive hot melt adhesive. CA 2649926 discloses an elastically stretchable laminate in accordance with a method wherein the elastically stretchable laminate comprises at least three layers, the method including the steps of: a) producing a first laminate consisting of a first non-elastic fibrous non-woven web and an elastic film; b) activating the first laminate by stretching it incrementally in at least one direction to make the first laminate elastically stretchable; c) stretching the activated first laminate to 10-200% in at least one direction; and d) laminating the stretched first laminate to a second non-elastic non-woven web. A problem with such an absorbent article is that pressure sensitive hot melt adhesive is also used during the processing of such an elastic laminate because the second non-elastic non-woven web is bondable to the activated first laminate.
    The present invention seeks to solve at least some of the problems mentioned above.
    It is an object of the present invention to provide an improved absorbent article of the type described above with regard to wear comfort. This object is achieved in accordance with the invention by a disposable absorbent article consisting of the features of the claims or as further specified herein. A further object of the present invention is to provide an elastic laminate of improved stretchability and softness, and wherein the use of adhesive can be kept low or avoided, leading to lower production costs and to a more environmentally friendly product than prior art laminates.
    SUMMARY OF THE INVENTION
    The present invention relates to an absorbent article, preferably a disposable hygiene article, such as diaper, sanitary pants, incontinence pants, and the like, as well as diapers, baby diapers, incontinence diapers, etc. Such an absorbent article may consist of a chassis consisting of a core area comprising an absorbent core (11), said chassis preferably further comprises a front panel, a rear panel and an elastic laminate (10), each of the front and rear panels having a waist edge, a crotch edge and a pair of side edges, wherein the front and behind panels are joined together along two opposite edges to define a waist opening and a pair of leg openings, at least one of the front and rear panels consists of an elastic laminate.
    In a first aspect, the present invention specifically relates to an elastic laminate consisting of: a first non-woven web (4), preferably a second non-woven web (6) and an elastic film (5) attached to the first web (4) ) is laminated and preferably laminated between the first and second non-woven web. The elastic laminate has the advantage of having improved properties with regard to stretchability, softness and comfort when compared to the prior art elastic laminates. Furthermore, these properties, and the stretchability in particular, are more reproducible in the present invention. This is advantageous in large production items such as disposable hygienic absorbent items, since it allows the wearer to choose the type of item based on these properties.
    According to the Kawabata KES-F system, the above-mentioned elastic laminate preferably consists of a stretchability that is higher than 40%, preferably higher than 45%, more preferably higher than 50%, even more preferably higher than 55%.
    In a preferred embodiment, the aforementioned elastic laminate consists of an average stretchability that is higher than 22%, preferably higher than 25%, more preferably higher than 30%, even more preferably higher than 35%, even more preferably higher than 40%, even more preferably higher than 45%, even more preferably higher than 50%, even more preferably higher than 55%, thereby averaging the stretchability of the laminates in ten articles of the test the same type.
    In a preferred embodiment, the first non-woven web and / or preferably the second non-woven web is laminated to the elastic film in an interrupted bonded area, preferably according to an interrupted bonded pattern that can be predetermined, preferably said pattern regularly. In a preferred embodiment, the aforementioned elastic film is stretched at least locally during lamination. Both previous properties, and in particular the combination, lead to improved stretchability of more than 40%, up to 60% or even more. Furthermore, they also lead to a bulky laminate, which in turn leads to increased softness of the laminate.
    Preferably, the first and / or second non-woven web (4 and 6) are bonded, preferably mechanically, thermally and / or thermo-mechanically bonded to the elastic film (5). For example, the ultrasonic welding can be used to bond the first and / or second non-woven web (4 and 6) to the elastic film (5). This method binds the elastic laminate with heat generated by ultrasonic oscillation and laminates each layer together.
    On cooling and forming, the elastic laminate layers are joined together. Preferably, the elastic laminate contains less than 1 g / m2 of adhesive, preferably less than 0.5 g / m2, more preferably about 0 g / m2.
    In a preferred embodiment, the above-mentioned elastic laminate consists of a softness that is higher than 13, preferably higher than 16, more preferably higher than 20, even more preferably higher than 25, even more preferably higher than 31 and / or formability higher than 20, preferably higher than 22, more preferably higher than 23, even more preferably higher than 24 according to Kawabata and / or a TS750 peak of at least 200 dB V2rms if the laminate from a TS7 peak of at most 25 dB V2rms exists, as measured by tissue softness analyzer. The above-mentioned softness could, or preferably, be measured according to the tissue softness analyzer as further specified below in this document.
    In a preferred embodiment, the non-woven webs consist of: - an extension in a machine direction of at least 60%; - a rigidity in a machine direction of at most; - a stiffness in a transverse direction of at most, and / or - a kinetic coefficient of friction (COF kin) of at most 0.30.
    Preferably, herein, - the elongation in the machine direction is measured according to the WSP test 110.4; - the rigidity in the machine and in the transverse direction is measured according to the WSP test 090.3, and / or - the COF chin is measured according to ASTM test D1894. WSP testing refers to Global Strategic Partners testing methods. These testing methods are the harmonized results of INDA's (Disposable Products and Nonwovens Association) efforts to develop global testing methods for the global nonwoven industry:
    The WSP110.4 test refers to a Standard Test Method to Break Force and Extension of Nonwoven Materials (the Strip Method);
    The WSP090.3 test refers to a Standard Test Method for Treatment-O-Meter Stiffness of Nonwoven Fabrics.
    More information about the WSP tests can be found in the tables below.
    The ASTM D1894 test refers to a Standard Test Method for Static and Kinetic Coefficients of Friction of Plastic Film and Tissue. This test method deals with determination of the coefficients of starting and sliding friction of plastic film and fabric when sliding over itself or other substances under specified test conditions. The procedure allows the use of a stationary sled with a moving surface, or a moving sled with a stationary surface. Both procedures yield the same coefficients of friction values for a given sample. It has ICS Number Code 83.140.10 (Films and Fabrics) and the standard is revealed in DOI: 10.1520 / D1894-11E01.
    In a second aspect, the present invention provides an absorbent article consisting of an elastic laminate according to an embodiment of the invention. Preferably, the above-mentioned article consists of a non-woven topsheet and a non-woven backsheet, and an elastic film laminated therebetween, thereby forming the above-mentioned elastic laminate, more preferably wherein the above-mentioned laminate is at least partially in a front section and / or a rear section of the above absorbent article is arranged.
    In a third aspect, the invention also provides a process for manufacturing an elastic laminate according to an embodiment of the invention, comprising the steps of: providing a first non-woven web (4), preferably a second non-woven web (6) and an elastic film (5) and laminating the elastic film (5) to the first non-woven web (4), preferably between first non-woven web (4) and second non-woven web (6) . In a preferred aspect of the invention, the web and film of the elastic laminate are laminated by bonding, preferably mechanical, thermal and / or thermo-mechanical bonding, more preferably by ultrasonic welding. In a preferred embodiment, the aforementioned elastic film is stretched during lamination, preferably at least 10%, more preferably at least 20%, even more preferably at least 50%, even more preferably at least 100%, more preferably at least 200% , even more preferably at least 300%, even more preferably at least 350%, even more preferably for at least 375%. In a preferred embodiment, the elastic film is stretched during lamination for less than 550%, more preferably less than 500%, even more preferably less than 450%. In a particularly preferred embodiment, the elastic film is stretched by approximately 400%.
    Preferably, the elastic film of the present invention is expanded in at least one direction, e.g. by 400%, during lamination to the first and / or preferably also the second non-woven web. In a preferred embodiment, the elastically used laminate is used in an absorbent article and is extensible in at least a transverse direction of the absorbent article.
    In a further aspect, the invention provides the use of an elastic laminate according to an embodiment of the invention for the production of an absorbent article.
    The elastic laminate provided by the invention can be particularly advantageous for use in an absorbent article such as a pant diaper.
    The preferred embodiments are as in the dependent claims and as further specified below.
    BRIEF DESCRIPTION OF THE DRAWINGS
    The invention will be further described in detail with respect to exemplary embodiments represented by the accompanying figures, wherein FIG. 1 shows a general schematic cross-sectional view of an elastic laminate consisting of a non-woven web (1) and of an elastic film (2). FIG. 2 shows a general schematic cross-sectional view of an elastic laminate consisting of an elastic film (5) sandwiched between two non-woven webs (4 and 6) according to the present invention. FIGS. 3 and 4 show a perspective view and detail of a pant diaper consisting of an elastic laminate (10) according to the present invention. FIG. 5 illustrates the measurement of elongation according to KES-FB01. FIG. 6 illustrates the measurement of compression properties according to KES-FB03. FIGS. 7a-c illustrates the measurement of area and geometric roughness according to KES-FB04. FIG. 8 represents the tensile energy that requires the force to stretch the material and which is a relative value for the strength of the material. FIGS. 9a-b illustrate the principle and test conditions for the TSA. FIGS. 10a-b and 11 illustrate the results of TSA on samples of the laminate according to the present invention and the comparison with Market Standard and competitive laminate.
    DETAILED DESCRIPTION OF THE INVENTION
    Unless otherwise specified, all terms used to disclose the invention, including technical and scientific terms, have the meaning as generally understood by someone of ordinary skill in the art to which this invention belongs. By way of further guidance, term definitions are included to better appreciate the teachings of the present invention.
    As used herein, the following terms have the following meanings: "A," "an," and "an" as used herein refers to both singular and plural referents unless the context clearly dictates otherwise. As an example, a "compartment" refers to one or more than one compartment. "Approximately" as used herein refers to a measurable value such as a parameter, an amount, a temporary duration, and the like, intended to include variations of +/- 20% or less, preferably +/- 10% or less , more preferably +/- 5% or less, even more preferably +/- 1% or less, and even more preferably +/- 0.1% or less of the specified value, in so far such variations have been designated to the disclosed invention to function. However, it must be understood that the value to which the "approximately" provision refers itself is also specifically disclosed. "Consist of" consisting of "and" consisting of "as used herein are synonymous with" include "," include "," include "or" contain "," contain "," contain "and include or open terms that presence of what follows specify, for example, a component and do not exclude or prevent the presence of additional, non-recited components, properties, element, members, steps known in the prior art or disclosed therein.
    The recitation of numerical regions by end points includes all numbers and fractions that are housed within that range, as well as recited end points.
    As used herein, the following terms have the following meanings: "Absorbent article" refers to devices that absorb and contain fluid, and more specifically, refers to devices that are placed against or in proximity to the wearer's body for the various secretions that discharged from the body to absorb and contain.
    The absorbent articles include, but are not limited to, diapers, adult incontinence diapers, training pants, diaper holders and liners, sanitary napkins, and the like. The absorbent articles preferably consist of a longitudinal axis and a transverse axis perpendicular to the above-mentioned longitudinal axis. The longitudinal axis is hereby conventionally chosen in the front-to-back direction of the article when reference is made to the article being carried, and the transversal axis is conventionally selected in the left-to-right direction of the article when reference is made to the article. article being worn.
    The absorbent article of the present invention is preferably a pant diaper consisting of a front section and a rear section, an absorbent material and an elastic laminate that is suitable at least partially in the front and / or rear sections. The elastic laminate which preferably consists of a two-layer or three-layer structure consists of an elastic film laminated to one or between two non-woven webs, preferably a front sheet and / or a back sheet of the absorbent article, the webs bonded on the elastic film, preferably by mechanical, thermal and / or thermo-mechanical connection, such as by ultrasonic welding. "Absorbent" or "absorbent core" is the absorbent structure suitable between the top sheet and the back sheet of the absorbent article in at least the crotch region thereof. The absorbent material can be of any conventional type. Examples of commonly occurring absorbent materials are cellulose fluff pulp, tissue layers, highly absorbent polymers (so-called super-absorbent polymer particles), absorbent foam materials, absorbent non-woven materials or the like. It is common to combine cellulose fluff pulp with super-absorbent polymers in an absorbent material. The super-absorbent polymers are water swellable, water insoluble organic or inorganic materials capable of absorbing at least about 20 times their own weight of an aqueous solution containing 0.9% by weight of sodium chloride Organic materials suitable for use as superabsorbent materials including uric materials such as polysaccharides, polypeptides and the like, as well as synthetic materials such as synthetic hydrogel polymers. Such hydrogel polymers include, for example, alkali metal salts of polyacrylic acids, polyacrylamide, polyvinyl alcohol, polyacrylates, polyvinyl pyridine, and the like. Other suitable polymers include hydrolyzed acrylonitrile grafted starch, acrylic acid grafted starch, and isobutylene maleic anhydride copolymers and mixtures thereof. The hydrogel polymers are preferably lightly reinforced to make the material substantially water insoluble. The designated superabsorbent materials are further surface-reinforced so that the outer surface or shell of the superabsorbent particle, fiber, flake, sphere, etc. have a higher cross-link density than the inner portion of the superabsorbent. The superabsorbent materials can be in any form suitable for use in absorbent compositions including particles, fibers, flakes, atmospheres, and the like.
    The "chassis" refers to a fundamental constituent of an absorbent article on which the rest of the structure of the article is built up or covered, e.g., in a diaper, the structural elements that give the diaper the shape of an underpants or pants when formed for wearing, such as a backsheet, a topsheet, or a combination of a topsheet and a backsheet. "Diaper" refers to an absorbent article generally worn by infants and incontinent persons over the lower torso.
    The "interrupted bonding pattern" as used herein refers to a pattern of bonded regions, especially bonded regions between layers consisting of the laminate of the present invention, wherein at least one region the layers are not bonded. An interrupted binding pattern may consist of a connected area or a plurality of loose bound areas. An interrupted bonded area may further consist of a bonded area consisting of a plurality of apertures, where the layers are not connected, preferably according to a regular pattern, or it may consist of separate loose bonded areas, e.g. a point bound pattern consisting of a majority of individual surrounded binding points consisting of unbound regions or a line bound pattern consisting of a majority of separate binding lines interspersed with unbound regions, preferably according to a regular pattern. "Disposable" is used herein to describe absorbent articles that are generally not intended to be washed or otherwise repaired or reused (ie, they are intended to be discarded after single use and, preferably, to be recycled, composted or to be disposed of in another environmentally compatible way). "Laminate" refers to elements that are attached together in a layered arrangement. "Non-woven" refers to a manufactured sheet, web, or batch of directionally or randomly oriented fibers bonded by friction and / or cohesion and / or adhesion, excluding paper and products that are woven, knitted, sewn with binding yarns or threads, or felted by grinding in the wet state, whether or not additionally punctured. The fibers can be of natural or artificial origin. They may also be interrupted or continuous fibers or formed in situ. "Stretchable" or "extendable" herein refers to a material that is stretched, without substantial breaking, for at least 10%, more preferably at least 20%, even more preferably at least 30%, even more preferably at least 40%, more at preferably at least 50% of its relaxed, initial length in at least one direction. The term may include elastic materials, as well as nonwovens that may be inherently extensible, but not necessarily in an elastic manner.
    Such nonwovens can be made to behave in an elastic manner by binding them to elastic films.
    The "pull" or "extension" herein refers to the extra length that a material reaches when a certain force is applied, leading to an elongated state of the material beyond the initial length without breaking the material. An extension of f.e. 50% means that the material with a first length of 100 mm has reached a length of 150 mm.
    "Ultrasonic welding" refers to a technology that connects two materials by melting them with heat caused by ultrasonic oscillation and then laminating them together, such that the molten materials fill and fill the gap between the two unaffected portions of the two materials, respectively. On cooling and molding, the two materials are connected to each other. FIG. 1 shows a general schematic cross-sectional view of an elastic laminate consisting of a non-woven web (1) and of an elastic film (2); FIG. 2 shows a general schematic cross-sectional view of an elastic laminate consisting of an elastic film (5) sandwiched between two non-woven webs (4 and 6) according to the present invention. FIG. 3 shows a perspective view of a pant diaper consisting of an elastic laminate (10) according to the present invention.
    The inventors have found a way to provide a better elastic laminate and a process to make laminate.
    In particular, in a first aspect the present invention provides an elastic laminate for absorbent articles consisting of a first non-woven web (4), preferably a second non-woven web (6) and an elastic film (5) which the first web is laminated and preferably laminated between the first (4) and the second non-woven (6) webs (Fig. 2).
    Preferably, the aforementioned elastic laminate consists of a stretchability according to Kawabata that is higher than 40%, preferably higher than 50%, more preferably higher than 60%, even more preferably higher than 80%. One of the advantageous properties of the absorbent article is that the elastic laminate is stretchable, thereby improving the fit and comfort level of the wearer. Furthermore, the stretchable elastic laminate gives a desired level of strength to the waistband that cannot be observed in the prior art absorbent article. Herein, the level of strength refers to the draw energy (WT) according to Kawabata, which is preferably at least 12 gF / cm.
    In a preferred embodiment, the elastic laminate consists of a softness higher than 13, preferably higher than 16, more preferably 20, even more preferably higher than 25, even more preferably higher than 31 according to Kawabata and / or a TS750 peak of at least 200 dB V2rms if the laminate consists of a TS7 peak of at most 25 dB V2rms, as measured according to the fabric softness analyzer. The softness of the elastic laminate has the advantage that it provides a feeling of comfort for the wearer. Therefore, preferably, the elastic laminate had soft outer and inner surfaces that cover the lower torso of the wearer, giving better softness and wearing comfort that could not be experienced in prior art absorbent articles. The inner and outer surfaces are preferably formed from a soft material that will not irritate the skin of the wearer and / or caregiver. The aforementioned softness could be measured according to Kawabata, or preferably, according to the tissue softness analyzer as further specified below in this document.
    In a preferred embodiment, the elastic laminate consists of formability that is higher than 20, preferably higher than 22, more preferably higher than 23, even more preferably higher than 24. One of the advantageous properties of the absorbent article is that it elastic laminate is stretchable with satisfactory formability thereby increasing the fit and comfort level of the wearer.
    A further advantage of the present invention is that the aforementioned elastic laminate is formed by joining it by ultrasonic welding; the elastic film (5) is connected to the non-woven webs (4 and 6) by melting them with heat generated by ultrasonic oscillation whereby at least the elastic film is stretched, e.g. by being stressed when laminated, resulting in an elastic laminate. The present invention is not limited to ultrasonic welding for joining the elastic film to the non-woven webs but to joining in general, such as chemical, mechanical, thermal, thermo-mechanical bonding and / or bonding by adhesives such as hot melts adhesives, but preferably mechanical, thermal and / or thermo-mechanical bonding.
    In a preferred embodiment, the welding is done according to a predetermined pattern, preferably an interrupted binding pattern, preferably the above pattern is regular. Such a pattern, preferably in combination with the elastic film that is stretched at least locally during welding, leads to a bulky laminate, which in turn leads to increased softness of the laminate.
    The elastic laminate can consist of good tensile strength and low permanent deformation properties. The present invention is guided to a stretchable laminate, the laminate is preferably stretchable in at least one direction, consisting of at least one or two non-woven webs (4 and 6), and an elastic film (5) attached to one non-woven woven or clamped between the two non-woven webs (4 and 6), wherein the above-mentioned elastic film (5) is stretchable in at least the same direction as the laminate. If the laminate is used in an absorbent article, the laminate is preferably stretchable in at least a transverse direction of the absorbent article. Furthermore, the above-mentioned stretchable laminate preferably consists of a softness that is higher than 13, preferably higher than 16, more preferably higher than 20, even more preferably higher than 25, even more preferably higher than 31 according to Kawabata and / or a TS750 peak of at least 200 dB V2rms if the laminate consists of a TS7 peak of at most 25 dB V2rms, as measured according to the fabric softness analyzer. The aforementioned softness should be measured according to Kawabata, or preferably, according to the tissue softness analyzer as further specified below in this document.
    In a preferred embodiment, the elastic laminate is composed of non-woven webs that are bonded, preferably mechanically, thermally and / or thermo-mechanically, more preferably ultrasonically welded to the elastic film.
    In a preferred embodiment, the elastic laminate contains less than 1 g / m2 of adhesive, preferably less than 0.5 g / m2, e.g. 0.4, 0.3, 0.2, 0.1 g / m2, more preferably about 0 g / m2. Often, one or more elastomeric components of a disposable absorbent article are bonded together via adhesives. For example, the adhesives have been used to bond together individual layers of the absorbent article. In many cases, component bonding together forms a laminated structure in which the adhesive is sandwiched between materials (such as layers of polymer film and / or layers of woven or non-woven fabrics) that make up the components that are bonded together. In many cases, a hot melt adhesive, i.e., a polymeric formula, is used in making a laminated structure. While such formulations generally work, they can be expensive and their performance characteristics can be improved. Furthermore, the environmental effect is important thereby preferably limiting the use of such adhesives. One of the advantageous properties of the absorbent article is that the elastic laminate of the present invention can be made consisting of less than about 1 g / m2 of adhesive, preferably less than 0.5, 0.4, 0.3, 0.2, 0.1 g / m2 about Og / m 2.
    In a second aspect, the invention provides an absorbent article consisting of an elastic laminate according to an embodiment of the invention.
    In a third aspect, the invention provides a process for manufacturing an elastic laminate comprising the steps of providing an elastic film (5) in which the elastic film is bonded, preferably mechanically, thermally and / or thermo-mechanically bonded on the non-woven web (4 and 6) thereby providing the elastic laminate.
    In a preferred embodiment, the invention provides a process in which the elastic film (5) and the non-woven webs (4 and 6) are preferably bonded by ultrasonic welding, wherein the above-mentioned elastic laminate has a softness higher than 16.
    In a preferred embodiment, the invention provides a process in which the elastic laminate has an extensibility in the transverse direction of the absorbent article for at least 40%, more preferably higher than 50%, even more preferably higher than 60% when measured according to the stretch test specified in the examples section.
    In a preferred embodiment, the invention provides a process for manufacturing an elastic laminate comprising the steps of: a) providing a first non-woven web (4); b) preferably providing a second non-woven web (6); c) providing an elastic film (5); d) laminating the elastic film (5) to the first non-woven web, or preferably between the two non-woven webs (4 and 6), thereby providing the elastic laminate.
    In a preferred embodiment, the aforementioned elastic film is stretched during lamination, preferably at least 10%, more preferably at least 20%, even more preferably at least 50%, even more preferably at least 100%, more preferably at least 200% , even more preferably at least 300%, even more preferably at least 350%, even more preferably for at least 375%. In a preferred embodiment, the elastic film is stretched during lamination for less than 550%, more preferably less than 500%, even more preferably less than 450%. In a particularly preferred embodiment, the elastic film is stretched by approximately 400%.
    Note that more stretch of the elastic film during production allows to obtain laminates consisting of a stretch of more than 40% and even up to 60% or more, while keeping production costs low, or, an inexpensive elastic film can be used to make a laminate consisting of a stretch of more than 40% and even up to 60% or more by stretching the film during lamination.
    Preferably, the aforementioned laminating is done by bonding, more preferably by mechanical, thermal and / or thermo-mechanical bonding, even more preferably by ultrasonic welding, and this preferably according to a predetermined pattern, preferably interrupted bonding pattern, preferably above pattern is regular. Such a pattern, preferably in combination with the elastic film, is stretched at least locally during binding, which leads to better stretchability of the laminate, and also leads to a bulky laminate, which in turn leads to increased softness of the laminate. The improved stretchability and the improved softness both increase the comfort for the wearer of the absorbent article separately, but in particular when combined.
    In a further aspect, the invention provides use of an elastic laminate for the production of an absorbent article.
    The present invention also provides an elastic laminate consisting of a first non-woven web (4), preferably a second non-woven web (6) and an elastic film (5) laminated to the first web and preferably laminated between the first (4) and second non-woven (6) web, and preferably consisting of any or any combination of the following: 1. An extension measured according to Kawabata that is higher than 50%, ie EMT> 50 %. 2. a material strength that remains the same during stretching. This means that the force required to stretch our laminate remains stable during stretching. This is measured by the Kawabata Trek linearity (LT.), Which is higher than 0.9 and preferably about 1.0, i.e. LT> 0.9 and preferably LT is about 1.0. 3. a Tensile Energy (WT) according to Kawabata which means WT> 12 gF / cm, which results in a unique elastic behavior of our laminate resulting in a better fit and wearing comfort (together with soft nonwovens that we have selected). Note that the tensile energy refers to the level of strength of the laminate and / or 4 folds created by using ultrasonic welding, which results in a bulky material. Soft nonwovens are preferably used which together result in a material that is very soft and bulky, quantified by the compression energy (WC) measured according to Kawabata. This parameter quantifies the energy required to compress the material to a certain level. In a preferred embodiment, WC <0.65 gF / cm 5. the laminate may consist of a soft wave pattern, preferably created in combination with soft nonwovens, resulting in a unique bulk softness, quantified according to Kawabata by the roughness (SMD). In a preferred embodiment, SMD is <5 μ. The above-mentioned softness could also be quantified with the tissue softness analyzer. 6. the laminate can consist of a softness: S = EMT / SMD + 1 / WC, whereby S> 13. The above-mentioned softness could be measured according to Kawabata, or preferably, according to the fabric softness analyzer as specified in this document. 7. the laminate can contain a formability according to Kawabata: F = WEIGHT + (EMT) A (1/2), whereby F> 20 8. the laminate can comprise a release force in the machine direction MD that is needed to make the outer layer of the elastic film, which is between 1 and 3 N 9. the laminate may comprise a release force in the transverse direction CD, which is necessary to separate the outer layer of the elastic film, which is between 1 and 3 N, and / or
    Hereby, the ultrasonic technology in combination with the soft nonwovens results in bulky soft waist material unique in e.g. a pull up diaper.
    Although the present invention has been described with respect to preferred embodiments thereof, many changes and alternations can be made by a person having ordinary skill in the art without departing from the scope of this invention as defined by the appended claims.
    The invention is described below in greater detail in the examples, which are given as non-limiting illustrations. In these examples, the temperature is the room temperature or is expressed in degrees Celsius, and the pressure is air pressure. The water used and all reagents are of an injectable nature.
    Furthermore, all examples form an integral part of the invention, as well as any feature of the description including the examples, which appear to be novel in relation to any prior art, in the form of a general characteristic rather than a specific characteristic of the example.
    Evaluation of the elastic laminate and the examples
    1. Objective measurement system: KES-F
    The Kawabata Evaluation System for Substances. Kawabata designed the Kawabata Evaluation System for Substances (the "KES-F") in 1972 to address a need for instrumentation that would allow substance parameters to be measured objectively quickly, accurately, and reproducibly (see, eg, Kawabata, S .; Niwa, M .; &amp; Wang, F. "Objective Measurement of Hand Measurement of Non Woven Fabrics," Textile Research J p. 597 (1994); Bishop, DP "Fabrics: Sensory and Mechanical Properties", Textile Progress Vol. 26, No. 3 (1995), and Matsuo, T. Nasu, N. & Saito, M. "Study on the Hand". Part II. The Method of Measuring Hand, "J. Text. Mach. Soc. Jap 17.3 92, (1971).
    The KES system of instruments measures the properties of textile fabrics and predicts the aesthetic qualities observed through human touch. The KES system consists of four instruments: KES-FB1 tensile and tear measuring device, KES-FB2 bending measuring device, KES-FB3 compression measuring device, and KES-FB4 surface friction and geometric-roughness measuring device. The parameters measured by the basic KES-F (B) instruments are the following: bending properties, surface properties (friction and roughness), compression properties, tear properties, and tensile properties. Each of these categories is composed of a group of related mechanical properties that can be measured separately (see list below).
    As mentioned, the Kawabata KES-FB test is a Japanese quality assessment system used for textile materials and revealed in "The Standardization and Analysis of Hand Evaluation (2nd Edition), Sueo Kawabata, July 1980, The Hand Evaluation and Standardization Committee, The Textile Machine Association of Japan ". The test used in this invention uses three of the Kawabata test machines: • KES-FB1 for measuring the Tensile stress, EMT (%), the Trek energy WT (gfcm / cm 2) and Linearity of the load extension curve LT ( -). • KES-FB3 for measuring the Compression energy WC (gf cm / cm2) • KES-FB4 for measuring the Geometric roughness (μ)
    For the present invention, the steel of interest consists of nonwoven whereby the total hand value (T.H.V.) was calculated according to the KN-304 Summer / winter comparisons.
    Herein, EMT = Tensile Voltage - measured with KES-FBOl LT = linearity of the load-expansion curve - measured with KES-FBOl - WT = Tensile energy - KES - FBOl
    Measurements were made in both directions (MD and CD) with the following setting (and with respect to FIG. 5):
    Steel surface: 20x20 cm
    Maximum load: F = 500 gf / cm
    Draw speed: 0.2mm / sec
    Effective steel: 20 cm wide and 5 cm in length
    Lengthwise extension
    Compression energy - WC [gFcm / cm 2] - KES-FB3
    The compression properties were measured between two plates with increasing pressure while continuously controlling the steel thickness up to a max. Pressure of 50 gf / cm 2. See also FIG. 6.
    Steel surface: 20x20 cm Compression speed: 20 pm / sec P0 = 0.5 gf / cm 2
    Maximum pressure: Pmax = 50 gf / cm 2
    Geometric roughness - SMD [μ] - KES-FB4
    The average deviation from the surface contour is measured with respect to FIGS. 7a-c.
    x = displacement of the sensor on the sample X = maximum of x, equal to 2 cm
    Speed of sensor displacement on specimen surface = 0.1 cm / sec 2. Basic properties that influence sensory comfort 2.1. Pull properties
    Tensile strength is a basic indicator of relative strength and is fundamental to materials that function primarily in stress. The expansion of a material is therefore an important factor for the comfort and softness of the material. Related to the expansion capacity of a material is the energy required for this expansion, the tract energy (WT).
    The tensile energy represents the force required to stretch the material and is a relative value for the strength of the material (see FIG. 8). The linearity indicates how the material extends: LT <1: the initial extension requires less force than at the end. LT = 1: the force required to stretch the material is spread evenly during expansion. LT> 1: the initial renewal requires more force than at the end.
    In the present invention, the laminate is a three layer structure with two soft nonwovens and an elastic film, ultrasonically laminated to each other. The elastic film is put under a specific tension and gives flexibility properties to the laminate.
    Namely, an important tensile property of the extension was determined for the elastic laminate of the present invention in comparison with a market standard and a lycra waist, in addition to the tensile linearity, tensile energy, compression energy and roughness, wherein "Par. = "Parameter" and "Gmd." = "Average").
    Note that for this table, the averages were obtained by testing 10 articles of the same type. From the table, we note the following:
    An extension (EMT) measured according to Kawabata that is higher than 40%, and on average even higher than 55%.
    A material strength remains the same during expansion. This means that the force required to stretch the laminate remains stable during expansion. This is measured by the tensile linearity according to Kawabata (LT), which is higher than 0.9 and preferably about 1.0, i.e. LT> 0.9 and preferably LT about 1.0. - A tensile energy (WT) according to Kawabata whereby WT> 12 gF / cm.
    A reduced roughness (SMD) and reduced compression energy (WC), which leads to increased softness.
    Smaller standard deviations for at least the tensile and compression properties than the market standard product, which indicates a better reproducibility of these properties, which results in a unique elastic behavior of the laminate resulting in a better fit and wearing comfort, together with the selected soft nonwovens. 2.2. Compression properties
    A compression energy (WC) measured according to Kawabata that quantifies the energy needed to compress a material to a certain extent. In a preferred embodiment, WC <0.65 gF / cm.
    One substance is considered softer than another when it requires less energy to be compressed. The capacity to return to its original form is measured by the compression resilience. 2.3. Surface properties
    The surface friction or COF (MIU) is significantly correlated with the perception of hardness, opposite of softness. A higher MIU indicates a material that has a high degree of friction and resists towing.
    The geometric roughness (SMD) corresponds to the roughness in terms of the geometric shape of the material. A lower SMD indicates a flatter material with a less geometric shape.
    Both lower MIU and SMD are positive for the softness. Flet laminate can consist of a soft wave pattern, preferably created in combination with soft nonwovens, resulting in a unique bulk softness, quantified by Kawabata for its roughness (SMD). In a preferred embodiment SMD <5 μ. 3. Softness evaluation 3.1 Softness of the elastic laminate
    The laminate is a three-layer structure with two soft nonwovens and an elastic film laminated to each other, preferably in an interrupted bonding region, and preferably by ultrasonic bonding. The elastic film is put under a specific tension and gives flexibility properties to the laminate. The nonwovens both have a very smooth surface. Due to the lamination process, folds are created in the laminate which increases mass and changes the sheet topology. These factors reduce 'stiffness' and increase flexibility. - Tensile properties: EMT and / or WT - strength and elasticity - Compression properties: WC - bulk effect - Surface properties: geometric, smooth surface 4. Formability and softness of the absorbent article described
    The laminate consists of a three-layer structure with two soft nonwovens and an elastic film. The elastic film is activated by extension and laminated to the nonwovens, preferably in an interrupted bonding region, and preferably by ultrasonic bonding. The nonwovens both have a very smooth surface. Because of the lamination process, folds are created in the laminate that increase mass and change sheette topology. These factors reduce stiffness and increase flexibility. The combination of the lamination technology and the soft raw materials results in a very flexible, soft and bulky laminate. This gives a unique adult incontinence pull up with a unique softness and wearing comfort that can be quantified according to Kawabata.
    Formability (Fit &amp; comfort) is obtained according to Kawabata from the formula:
    Formability - F - WT + VEMT
    Softness according to Kawabata is obtained from the formula:
    Softness = EMT / SMD + 1 WC
    Ref.l: Cotton knitted goods
    Ref.2: Market Standard Protective Underwear pull up material Ref.3: Standard laminates of nonwovens with lycra elastics Ref.4: elastic laminates according to the present invention. 5. Emtec - TSA - Fabric Softness Analyzer
    Based on a new measuring method, invented in 2004 by Dipl. Phys. Giselher Gruener, which simulates the human feeling of a tissue sample, a measuring instrument was developed by Emtec Electronic Leipzig. It provides three basic parameters of the human hand feeling.
    The instruments collect three important factors for human sensation: - The softness of the fiber - The roughness of the texture - Stiffness
    This device is on its way to becoming a standard measuring instrument in the fabric industry and its technology can be applied to nonwovens and laminates in the hygiene industry.
    Principle:
    See also FIGs. 9a-b for reference regarding the principle and test conditions for the TSA.
    The movement of blades produces, depending on the type of tissue, different types of vibrations or sounds, detected by a vibration sensor. Then the test piece will be deformed measuring the elastic properties.
    The vertical vibration of the steel is caused by movement of the blade over the surface of the steel. The magnitude of the vibrations depends on the height of the structure (creases, relief shapes, ...). This results in the TS750 peak - texture peak, which is the first peak of the resulting spectrum. The higher the peak, the rougher the texture.
    The horizontal vibration of the blade itself is caused by the fibers themselves when moving from the surface. This results in the TS7 peak softness peak. The resonance frequency of the blades themselves is approx. 6500 Hz. The higher the peak, the lower the softness of the steel.
    In the second step, the deformation of the sample is measured, which correlates with the rigidity of the product. The blade applies a certain load to the steel in three cycles in the vertical direction. The higher the value of deformation, the higher the flexibility of the product.
    Test conditions:
    Instrument: Emtec - TSA - tissue softness analyzer
    All measurements must be carried out under standard climatic conditions ISO CEN DIN 20187: (23 ° C (± 0.5 ° C) and 50% (± 2%) relative humidity). Sample: area of 100 cm2 (diameter 112.8 mm).
    Capiler: 100 µm
    Measing Force: 100 Mn measuring, duration approx. 45sec.
    Density: 140 g / m2 Rotation speed: 2 rps [1 / s]
    Leaf temperature: 23 ° C ± 0.5 ° C
    Number of folds: 3 E / D / P / H measurement at 10/600 Mn
    Results
    See FIGs. 10a-b and 11 illustrating the results of the TSA on samples of the laminate according to the present invention and the comparison with the Market Standard and competitive laminate.
    The current laminate shows a very low softness peak (TS7 peak) in combination with a high texture peak (TS750 peak). This results in the unique extensive softness of the laminate.
    Therefore, in a preferred embodiment, the laminate consists of a TS750 peak of at least 200 dB V2rms if the laminate consists of a TS7 peak of at most 25 dB V2rms, more preferably the laminate has a TS7 peak of at most 20 dB V2rms, i.e.
    If TS7 peak <25 dB VA2rms, TS750 peak> 200 dB VA2rms If TS7 peak <20 dB VA2rms, TS750 peak> 200 dB VA2rms
    权利要求:
    Claims (12)
    [1]
    CONCLUSIONS
    An elastic laminate for absorbent articles comprising: a first non-woven web, preferably a second non-woven web and an elastic film laminated to the first non-woven web, preferably laminated between the first and second non-woven webs wherein the above-mentioned elastic laminate comprises a stretchability according to Kawabata that is higher than 40%, characterized in that the above-mentioned elastic film is stretched during lamination.
    [2]
    An elastic laminate for absorbent articles comprising: a first non-woven web, preferably a second non-woven web and an elastic film laminated to the first non-woven web, preferably laminated between the first and second non-woven webs wherein the above-mentioned elastic laminate comprises a softness according to Kawabata that is higher than 13 and / or a TS750 peak of at least 200 dB V2.
    [3]
    The elastic laminate of claim 1 wherein said elastic laminate comprises a softness according to Kawabata that is higher than 13 and / or a TS750 peak of at least 200 dB V2 ^ if the laminate consists of a TS7 peak of at most 25 dB V2rms, such as measured according to the tissue softness analyzer.
    [4]
    An elastic laminate according to claims 1 or 3, wherein • the above-mentioned elastic film is stretched during lamination for at least 50%, more preferably at least 100%, even more preferably at least 200%, more preferably at least 300%, even more preferably at least 400%; and / or the above-mentioned first non-woven web and / or preferably the second non-woven web is laminated to the elastic film in an interrupted bonding region.
    [5]
    An elastic laminate according to any of the preceding claims wherein said first and / or preferably said second non-woven comprises - an extension in a machine direction of at least 60%; - a rigidity in a machine direction of at most 35 mN; - a stiffness in a transverse direction of at most 20 nM, and / or - a kinetic coefficient of friction (COF kin) of at most 0.30.
    [6]
    An elastic laminate according to any of the preceding claims comprising a formability according to Kawabata that is higher than 20.
    [7]
    The elastic laminate according to any of the preceding claims comprising less than 1 g / m2 of adhesive.
    [8]
    An absorbent article comprising an elastic laminate according to any of the preceding claims.
    [9]
    An absorbent article according to claim 8, comprising a non-woven front sheet and a non-woven back sheet, and an elastic film laminated therebetween, thereby forming the above-mentioned elastic laminate, more preferably wherein said laminate is at least partially in a front section and / or a rear section of the above absorbent article is arranged.
    [10]
    Use of an elastic laminate according to any of claims 1 to 9 for the production of an absorbent article.
    [11]
    A process for manufacturing an elastic laminate according to any of claims 1 to 10, comprising the steps of: providing an elastic film and laminating, preferably mechanically bonding, the elastic film to a first non-woven woven web or between a first non-woven web and a second non-woven web, thereby obtaining an elastic laminate comprising a stretchability according to Kawabata that is higher than 40% and / or comprising a softness according to Kawabata that is higher than 13 and / or a TS750 peak of at least 200 dB V2 ^ if the laminate consists of a TS7 peak of at most 25 dB V2rms, as measured by the fabric softness analyzer, characterized in that the above-mentioned elastic film is stretched during lamination.
    [12]
    A process according to claim 11, wherein said elastic film is stretched during lamination for at least 50%, even more preferably at least 100%, more preferably at least 200%, even more preferably at least 300%, even more preferably at least 400 %, and / or wherein the above-mentioned first non-woven web and / or preferably the second non-woven web is laminated to the elastic film in an interrupted bonding region.
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    同族专利:
    公开号 | 公开日
    EP2891480A1|2015-07-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20050101216A1|2003-11-12|2005-05-12|Middlesworth Jeffrey A.|Composite elastic web|
    US20080033387A1|2004-06-22|2008-02-07|Sca Hygiene Products Ab|Absorbent Article Comprising An Elastic Laminate|
    US20090208703A1|2006-05-12|2009-08-20|Sca Hygiene Products Ab|Elastic laminate and a method for producing an elastic laminate|
    JP6169786B2|2013-05-03|2017-07-26|ザ プロクター アンド ギャンブル カンパニー|Absorbent article comprising an extensible laminate|
    US10568776B2|2016-08-12|2020-02-25|The Procter & Gamble Company|Method and apparatus for assembling absorbent articles|
    CN114010398A|2017-03-27|2022-02-08|宝洁公司|Elastomeric laminate with crimped spunbond web|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    EP14150234.4A|EP2891480A1|2014-01-06|2014-01-06|Extensible laminate|
    EP14150234.4|2014-01-06|
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