• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a forming section of a fiber web machine, wherein the forming section (10) comprises a plurality of forming units (24, 34, 44, 54) comprising a first forming unit (24) for forming at least one first web layer (12, 13, 14) ) comprising at least one screen (16), at least one second or secondary forming unit (34) for forming a second web layer (15), the second forming unit (34) having a head box (35) with an outlet opening (21), an upper wire (36) running in a loop having a run (47) cooperating with the wire (16) of the first forming unit (24) and a lower guide roll (59) having a dewatering means (50 ) disposed in the loop of the upper screen (36), and wherein the headbox (35) of at least one second forming unit (34) is provided for feeding the stock onto the surface (S) of the upper screen (36) the area of drainage feeding device (50) after the lower guide roller (59). The discharge opening (21) of the head box (35) is intended to be arranged between a region (45) of the lower guide roller (59) and the sieve (16) of the first forming unit (24). In addition, the invention also relates to a secondary forming unit for a multi-layer forming section of a fiber web machine. (Fig. 1)
    公开号:AT516646A2
    申请号:T51068/2015
    申请日:2015-12-15
    公开日:2016-07-15
    发明作者:Antti Poikolainen；Juan Cecchini；Sami Anttilainen
    申请人:Valmet Technologies Inc；
    IPC主号:
    专利说明:

    Formierpartie a fiber web machine and secondary Formierpartie for a Mehrlaqenformierpartie a fiber web machine
    The invention relates to a forming section of a fiber web machine, the forming section comprising a plurality of forming units comprising: a first forming unit for forming at least one first web layer comprising at least one screen; at least one second forming unit for forming a second web layer, the second forming unit comprising: a headbox having a discharge opening, an upper wire running in a loop having a run cooperating with the wire of the first forming unit; and a lower guide roll having a runner Ent- watering device follows, which is arranged in the loop of the upper sieve.
    Furthermore, the invention relates to a secondary or second forming unit for a Mehrlageformierpartie a fiber web machine.
    In a so-called forming section of a fiber web machine, water is removed from the fiber suspension which has been spread on the wire to form a web. The Formierpartie is also referred to as a wire section. The forming section is provided with a plurality of sequential dewatering devices generally located behind the wire.
    The trend is towards increasingly demanding requirements for the paper and board products to be produced. This is true for both the mechanical properties requirements and the ability of the material to produce a good print result. New regulations for recycling increase the requirements for using recycled fibers to a greater extent. It follows that even inferior fibers are to be used for paper and board products, with even higher requirements in terms of quality and running properties.
    A large number of methods and machines for producing paper and cardboard have been described in the literature and have been used in practice with more or less great success. PCT Publication WO 97/45589 A1 may be cited as an example thereof. This describes a solution with a primary forming unit leading the stock to the Fourdrinier wire, followed by a plurality of second and secondary forming units, each feeding the stock to the layer previously formed on the Fourdrinier wire. The stock fed by the secondary forming units has a relatively low consistency.
    The methods and machines have in common that they can not easily meet the above requirements, especially in the case of folding carton boxes composed of an upper layer, an intermediate layer, a solid core and a back layer, which is particularly important in that the core has the best possible properties, such as sheet formation, bulk and ridge weight profile, and that the interlayer has a uniformity such that the top layer formed thereon has the best possible printability. In addition, the layered web formed in the preceding steps on the Fourdrinier wire is not yet very strong and when combined with the low consistencies of the secondary forming units can cause runnability problems because the secondary and second layers are still not very well infiltrated. In addition, this greatly limits the running speed of the machine.
    An object of the present invention is to provide a forming section of a fiber web machine and a secondary forming unit for a multi-layer forming section of a fiber web machine, which has good controllability for adjusting the bonding consistency and, in addition, a good consistency profile on the lower side of the fiber web machine Railway in terms of capacity forms. The characteristic features of the forming section according to the invention are indicated in claim 1 and those of the secondary or second forming unit in claim 9.
    In the invention, the headbox of at least one secondary forming unit is provided for feeding the stock to the upper sieve surface onto the portion of the dewatering means downstream of the lower guide roll, and a headbox discharge opening is provided between the lower guide roll portion and the lower head first forming unit to be arranged. This allows pre-filtration of the layer and enhances the ability of the layer to intermesh with the other layers previously formed. This also allows the use of the lower consistencies in connection with the secondary forming units, i. H. larger currents. This improves the quality of the web.
    With the solution according to the invention, conversions or rebuilding of board machines can be carried out in a simple manner. In addition, the space requirement of the secondary forming unit is much lower than in solutions according to the prior art.
    In addition, the forming process for the layers allows a significant improvement in terms of formation, surface texture, and bulkiness. The separate feeding of the stock in the secondary forming units also causes shearing forces on the stock. This improves the sheet formation. This makes the final web thick and firm and does not shine through the core layer or core layer does not shine through. In addition, the variety of layers makes drainage easier. Other additional advantages achieved by the invention will become more apparent from the description, and the description is given in the claims. The invention, which is not limited to the embodiments set forth below, is described in more detail with reference to the accompanying drawings, in which:
    1 shows a side view of a forming section of a fiber web machine according to the first embodiment of the invention with a flybrid former and a secondary or second forming unit for producing a three-ply paper board web,
    Fig. 2 shows a side view of a lower portion of a secondary forming unit according to the first embodiment of the invention,
    3 shows a side view of a lower portion of a secondary forming unit according to the second embodiment of the invention, and FIG
    4 shows a side view of a forming section of a board machine according to the second embodiment of the invention with a hybrid former and three secondary or second forming units for producing a four-ply paper board web.
    Fig. 1 shows schematically an exemplary embodiment of a wet end, i. H. a Formierpartie 10, in a fiber web machine for producing a paper carton web or board web 11. In this
    Embodiment, the web 11 is composed of three layers - a backsheet 12, a core 13, and a top or top layer 15. In the embodiment, the forming section 10 now comprises an extended hybrid former 27 having at least one wire 16, which in FIG a loop around an upstream breast roll 17, a downstream suction roll 18, a squeegee roll 19 and a plurality of guide rolls 20 including respective alignment and tensioning rolls 22, wherein the dewatering of the stock and the web-forming upper run 23 of the wire 16 of the first forming unit 24 between the breast roll 17 and the suction sieve roller 18 is substantially horizontal. After the forming section 10, the web 11 is passed to a press section (not shown).
    The forming section 10 has a plurality of forming units 24, 34 for forming the layers 12, 13, 15. In the illustrated embodiment, a first forming unit 24 comprises at least one screen 16 and a headbox 25 disposed near the breast roll 17 for supplying jets of stock to the upper run 23 of the wire 16 of the first forming unit 24, the stock fabrics being textures or Have fabric densities of 0.5-1.0%. In this embodiment, for example, the head box 25 is a so-called multi-layer casserole, which may be known as such.
    The first forming unit 24 shown in Figures 1 and 4 also has a so-called upper sieve 42, d. H. a hybrid forming unit 43, on. In this or this, as well as by drainage facilities 46, the water is removed upwards.
    The hybrid former 27 has a first forming unit 24 with a forming table 26 having a dewatering device (not shown) following the breast roll 17. In addition, within the loop of the screen 16 of the first forming unit 24 and on the lower side of the upper flat run 23 thereof are provided a plurality of other drainage and / or runnability devices 32, 33, 37 which may be known as such. Your positioning will be described in detail later. Some examples of the dewatering device are hydrofoils or suction elements, such as suction boxes. The forming table 26 is disposed at the beginning of a forming section of the hybrid former 27 on the lower side of the upper run 23 of the screen 16 of the first forming unit 26 to dewater the stock, thereby producing at least a first web layer 12, 13 herein as a backsheet and core layer and, for example, have a consistency of about 6 to 15%, preferably 8 to 12%.
    In addition to the first forming unit 24, the forming section 10 also has at least one second or secondary forming unit 34 for forming a second web layer 15. The secondary forming unit 34 is disposed after the hybrid forming unit 43. The second forming unit 34 is now provided for forming a third layer 15, referred to as upper layer, in connection with the upper run 23 of the screen 16 of the first forming unit 24 within a second section B of the hybrid former 27.
    The secondary forming unit 34 has a headbox 35, an upper wire 36 that runs in a loop, and a drainage device 50. Downstream of the headbox 35, a support table 37 for the wire 16 of the first forming unit 24 is provided. The upper wire 36 rides on a plurality of guide rolls 38, 59 and in an accompanying run 47 (Figs. 2 and 3) within at least a portion of the portion B for cooperation with the upper run 23 of the wire 16 of the first forming unit 24. In the lower At the bottom of the run of the upper screen 36, there is provided a lower guide roller 59 followed by a dehydrator 50. By means of the guide roller 59, the running direction of the upper screen has been changed in the direction of the dewatering device 50. In the described embodiments, the lower guide roller 59 is disposed near the upper run 23 of the screen 16 of the hybrid former 27 and the headbox 35. The dehydrator 50 is disposed in the loop of the upper screen 36. In addition, the dehydrator 50 immediately after the guide roller 59 follows.
    The headbox 35 of the second forming unit 34 is configured to dispense a jet of stock to form the topsheet 15 on the previously formed backsheets and core layers 12, 13 carried by the wire 16 of the first forming unit 24. As shown in Figs. 2 and 3, according to the embodiments, the headbox 35 of at least one secondary forming unit 34 is arranged in such a manner relative to the upper wire 36 and the lower guide roll 59 that it is intended to feed the stock the surface S of the upper screen 36 of the forming unit 34 after the lower guide roller 59 supply. The output jet of the headbox 35 impinges on the surface S of the upper screen 36 in the region of the dewatering device 50.
    In addition, the outlet opening 21 of the head box 35 is arranged so that it is located between the area of the lower guide roller 59 and the wire 16 of the first forming unit 24. In this embodiment, the outlet opening 21 of the headbox 35 is arranged so that it is located between the middle point of the lower guide roller 59 and the screen 16 of the first forming unit 24. Due to this fact, the stock of the secondary forming unit 34 is fed to its own wire section including the dewatering device 50 before the web layers 12, 13, 15 are joined. Due to this fact, the headbox 35 of the secondary forming unit 34 is separate from the first or primary web running on the wire 16. This improves the prefiltration of the layer 15. In addition, this also gives the headbox structures more space between the outlet channel 39 and the already formed web 12, 13 and makes it possible to improve the running speed of the board machine.
    The jet angle of the headbox 35 may be very low, such as 1-3 °. The jet from the outlet opening 21 of the headbox 35 is substantially parallel with the layers 12, 13 of the web located on the wire 16 of the first forming unit 24. The angle of incidence of the stock fed from the headbox 35 of the at least one secondary forming unit 34 to the upper wire 36 may, for example, be in a range of 0.1-5 °. The rotation of the guide roll 59 causes a vacuum which keeps the jet in contact with the upper wire 36. In addition, the dewatering device 50 of at least one secondary forming unit 34 may be at least partially of a non-pulsating type. This assists in taking up the layer 15 from the upper wire 36.
    For example, the consistency of the stock fed from the headbox 35 to the secondary forming unit 34 and forming the second layer 15 may be in the range of 0.3-1.5% and the basis weight in the range of 20-80 g / m2, for example , The dewatering means 50 of the second forming unit 34 dewaters the stock so that thereafter the layer 15 formed by the secondary forming unit 34 has a consistency of 5-12% and the combined three-ply web 12,13,15 formed thereby has a consistency of, for example, 6 -15%, preferably 8-12%.
    In the described embodiments, the dewatering device 50 of the secondary forming unit 34 has an upper table 69 disposed on the lower side of a housing 71. The housing 71 is disposed within the loop and the upper table 69 at the beginning of the lower run of the upper screen 36 opposite the upper flat run 23 of the screen 16 of the first forming unit 24. The housing 71 has in both embodiments three successive suction chambers or boxes 74-76. The suction amount may increase in the running direction of the upper wire 26. As with the upper drainage table 69, the chambers 74-76 are disposed in the loop of the upper wire 36 just after the lower guide roll 59 of the secondary forming unit 34 and on the upper side of the lower flat run of the upper wire 36 to dewater the stock. whereby the layer 15 formed by the second forming unit 34 with a consistency of 5-15%, preferably 7-12%, is formed.
    The upper drainage table 69 may define a plane on which the upper wire 36 and the layer 35 are supported and in sliding contact with the table 69. The dewatering device 50 may be suspended by means of an adjustment device (not shown) which allows the upstream and downstream ends of the dewatering device 50 to be independently raised and lowered to move the dewatering device 50 at a tangent to the reference plane lower guide roll 59 to tilt.
    In the illustrated embodiment, the housing 71 has three successive suction chambers 74-76 to collect white water forced through the upper wire 36 due to the suction action. In the embodiment of FIG. 2, the first chamber 74 and, in the embodiment of FIG. 3, the first and second chambers 74, 75 act on the layer 15 via sections 28 having a plurality of bores 29. The corresponding construction can also be carried out by means of narrow, elongated lamellae or slats, which are attached to the housing and separated at intervals of, for example, 5-15 mm. These dewatering foils are in contact with the upper wire 36 and there is a gap between successive dewatering fins whose width may be, for example, 5 - 10 mm. In this case, the layer 15 is subjected to a non-pulsating removal of water.
    The bores 29 may be drilled and arranged to the corresponding portions of the upper table 69, which is arranged on the lower side of a housing 71 with the suction chambers 74-76. In both embodiments, an elongate, continuous slot 40 is provided at the beginning of the first chamber 74 in front of the section with the bores 29. The slot 40 is intended to provide a passage for the air flow upwards available, the immediacy bar after the lower guide roller 59 in the closing gap occurs on.
    In addition, in both of the described embodiments, the upper table 69 has one or more sections 41 containing a plurality of elongate louvers or laths 79, d. H. Blades which are mounted with respect to the housing 71 and separated by gaps 78. These dewatering foils are in contact with the upper wire 36 and a gap is formed between successive dewatering foils. Thus, the layer 75 is subjected to successive pulsations, which improve the removal of the water. The vacuum in a foil box improves drainage.
    In the embodiment of Fig. 2, the second and third chambers 75, 76 and in the embodiment of Fig. 3, only the third chamber 76 acts on the layer 15 via the portions 41 having a plurality of spaces 78 75, 76 is in open communication with its own set of clearances 78 to soak up the white water drawn from the layer 15 through the upper wire 36. In addition, at least in the embodiment of Fig. 2, the fins 79 may also act as foils. In the embodiment of Fig. 3, the fins 79 in the upper table 69, which are separated from one another by gaps 78, are provided for deflecting the small amount of white water sucked out of the layer 15 in the upward direction. According to one embodiment, the width of the fins 79 may be 5 - 50 mm and the width of the intermediate spaces 78 5 - 50 mm.
    In addition, the upstream end of the upper table 69 may have a fin 80 which easily scrapes on the upper screen 36 to deflect the white water which accumulates on the upper side of the upper screen 36. The upper table 69 may have a first or infeed straight zone 82 and a second or final curved zone 83 with a large radius.
    The lower run of the secondary forming unit 34 is arranged to approach the first forming unit 24 in the direction of movement of the wire 16. The approach can be regulated by means of the position of the lower guide roller 59 and the inclination of the dewatering device 50 by the adjusting device (not shown). In other words, the angle of inclination a (Figures 2 and 3) between the upper sieve 36, which is on the area of the dewatering device 50, d. H. after the lower guide roll 59, runs, and the upper run 23 of the wire 16 can be adjusted. The inclination of the lower run of the upper wire 36, d. H. the upper table 69 of the housing 71, forms an angle α of 1 - 45 °, preferably 5 - 20 °, with a reference plane, which is the upper run 23 of the sieve 16.
    Adjustment of the inclination angle α may be performed by adjusting the position of the assembly 49 including the lower guide roller 59 and the dehydrator 50, according to an embodiment. The position of this structural assembly 49 can be adjusted by means of an adjustment device (not shown) which, for example, allows the assembly 49 to be raised, lowered and / or rotated to set an inclination angle α. The pivot point 48 of the assembly 49 may, for example, in the lower right corner of the housing 71, d. H. in the last drainage blade 79, be arranged.
    In addition, for this purpose, the entire unit 34 can be adjusted. By means of this adjustment of the approach, it is possible to control the amount of water remaining in the layer formed by the secondary forming unit 34 to obtain a liquefied state in the layer 15 on the lower part of the layer 15. On the other hand, the setting contributes to retaining enough water in the web layer 15 during its formation to prevent the fibers from "freezing". This inclination angle α makes it possible to obtain a short and low forming unit, which is an important issue in conversions and rebuildings.
    The upper wire 36 of the secondary forming unit 34, looping over the guide rolls 38, 59, should be brought into contact with the wire 16 of the first forming unit 24 of the hybrid former 27 to remove the layer formed by the secondary forming unit 34 with the two, three or more layered web 12, 13 to unite or gautschen to form the finished multilayer web 11. This takes place after the lower guide roll 59 and possibly also after the dewatering device 50. In the embodiment of FIG. 2, this approach has been performed after the dehydrator 50. The separate connection unit 30, for example a suction box (or a roller nip), which is also located in the region of the loop of the upper screen 36, supports this. Thus, after the dewatering device 50, a separate connection unit 30 may be arranged to surround the web layer 15 formed by means of at least one secondary forming unit 34 with the at least one, on the
    Sieve 16 of the first forming unit 24 located web layer 12, 13 to connect. In the embodiment of FIG. 3, the approach has already been made in the area of the dewatering device 50 in connection with the effective area 41 of the last suction chamber 76.
    By the invention, d. H. the bonding of the layers to each other after the contact line has been achieved a very good controllability for adjusting the connection resistance. Furthermore, the concept, when viewed from the point of view of capacity, produces a good consistency profile to the lower side of the layer 15, which is joined to other layers 12, 13 running in the screen 16 of the first forming unit 24. The upper side of the layer 15 thickens to a high consistency due to the vacuum suction box 74-76 on the side of the layer 15, and the lower side of the layer 15 remains with a low consistency to ensure a good bonding strength. This can be controlled by means of an online control of the vacuum level of the suction box. Furthermore, the average consistency of the layer 15 is higher than in a state of the prior art solutions, but the side of the layer 15 being joined remains wet enough.
    4 shows a side view of a forming section 10 of a board machine according to another embodiment. In this case, the forming section 10 in turn has the hybrid former 27 and three secondary forming units 34, 44, 54 for producing a four-ply paperboard or board web 11. By means of the first forming unit 24, a first layer 12 has been formed on the web 11, which is referred to herein as the rear layer 12. In this case, the suction box 25 of the first forming unit 24 is a liner suction box.
    The secondary forming section, which now has three separate sections B-D, includes in the first section B the first secondary forming unit 44 for forming a second layer 13, referred to as a core. The core is formed from stock having a consistency of 6-15%, preferably 8-12%, which is supplied to the upper wire 36 of the first secondary unit 44 from a headbox 35 and is dewatered before being converged , wherein the screen 16 of the first forming unit 24 carries the rear layer 12, which was previously formed in the first forming unit 24, and an upper screen 36 of the first secondary forming unit 44 and under the influence of an upper table 69, which areas 28 with holes 29th and fins 79, which are separated from one another by gaps 78, are in the loop of the upper wire 36.
    Furthermore, the secondary forming section in the second section C has the second secondary forming unit 54 for forming a third layer 14, referred to as an intermediate layer. The interlayer is formed by stock having a consistency of 0.3-1.4%, which is supplied from a headbox 35 to the upper wire 36 of the second secondary unit 54. Again, the liner below the secondary forming unit 54 is dewatered in conjunction with the run of the upper screen 36 of the second forming unit 54 and under the influence of an upper table 69 having areas 28 having holes 29 and fins 79 spaced apart by gaps 78 are spaced, in the loop of the upper screen 36, before being converged to the screen 16 of the first forming unit 24, which carries the previously formed rear layer 12 and the core 13.
    A third secondary forming unit 34 may be disposed in the portion D for forming a fourth layer 15 called a surface layer or a ceiling. This may have an identical construction as the forming units 44, 54 described above.
    Again, the three secondary forming units 34, 44, 54 have a headbox 35, an upper sieve 36 and a drainage device 50. Downstream of the headbox 35, a support table 37 for the wire 16 of the first forming unit 24 is provided. As can be seen in Figure 4, the upper wire 36 of the secondary forming units 34, 44, 54 passes over a plurality of guide rolls 38 and in a companion run 47 within sections B-D for connection to the upper run 23 of the wire 16 of Figs First forming unit 24. The headbox 35 of the forming units 34, 44, 54 is designed to dispense low consistency stock in the range of 0.5-1.0%. All of the secondary forming units 44, 54, 34 are intended to form layers 13-15 in connection with the upper run 23 of the screen 16 of the first forming unit 24 within successive sections B-D of the hybrid former 27. The layers 13-15 and the screens 16, 36 form a sandwich structure including the upper screen 36, the screen 16 of the first forming unit 24, and the web layers sandwiched therebetween over at least a portion of the spacing on each of the sections B-D. This distance may be provided downstream of the dehydrator 50 as far as the guide roll 38 from which the upper wire 36 travels in the loop.
    According to the embodiment described in FIGS. 1 and 4, a separation suction box 37 is also disposed below and along the screen 16 of the first forming unit 24 at the end of the run of the upper screen 36 where the upper screen 36 and the screen 16 of the first forming unit 24 diverge so that the multi-ply web continues to accompany the wire 16 of the first forming unit 24. The Trennsaugkasten 37 may have a curved surface along which the sieve 16 of the first forming unit 24 slides. A suction box 37 of the extended hybrid former 27 causes the layer formed by the second forming unit 34 to adhere to the lower wire 16 so that the web can then be transported to the next possible secondary forming unit or to the wire suction roll 18 to the press section of the board machine. In other words, the separation suction box 37 is designed to ensure that the formed multi-ply web does not follow the upper wire 36 of the secondary forming unit 34.
    In addition, within the wire loop 16 of the first forming unit 24 are also suction boxes 32 (FIGS. 1 and 4) or corresponding means arranged to remove the air from the closing gap 45 of the secondary forming unit 34. This air is sucked through the sieve 16 down. In general, a portion of the air that differs from the gap 45 may be drawn through the layer 15 upwardly by means of the slot 40 or downwardly by means of the suction box 32. In addition, these suction boxes 32 ensure that the web already on the screen 16 remains there and does not interfere with the layer 15 formed by the secondary forming unit 34.
    Within the wire loop 16 of the first forming unit 24 are also suction boxes 33 (Figures 1 and 4) or corresponding means between the sections at the beginning of the secondary forming units 34, 44, 54 arranged to remove the air before the upper run 23 of the screen 16th goes under the headbox 35 of the secondary forming unit 34. This air is sucked down through the sieve 16. In addition, these suction boxes 33 ensure that the layer already on the screen 16 of the first forming unit 24 remains there and the layer 15 formed by the secondary forming unit 34 does not interfere.
    If desired, the number of secondary forming units can vary. Forming section 10 may comprise, for example, 2 to 4 secondary forming units 34, 44, 54. For example, the secondary forming units may have the same construction as the forming units described above. The plurality of secondary forming units are also effective in terms of energy, because it is easier to dewater the plurality of thin layers compared to a thick layer.
    Further, at least part of the secondary forming units 34 may have been provided with the moving mechanism 31 to bring them into communication with the wire 16 of the first forming unit 24 and to remove them accordingly. This makes it possible to produce more paper types by means of the same machine efficiency in terms of energy.
    Furthermore, an additional aspect of the invention is the secondary forming unit 34, 44, 54 for a multi-ply forming section 10 of a fiber web machine. This type of secondary forming unit 34, 44, 54 can be used, for example, in rebuildings. The secondary forming unit 34 has a headbox 35 with a discharge opening 21 and guide rolls 38, 59 about which an upper wire 36, which runs in a loop, can be arranged. Furthermore, the secondary forming unit 34, 44, 54 also includes a suction box 50 for draining within the loop of the upper screen 36, which has a housing 71 and an upper table 69. In the area of the guide roller 59, the run of the upper screen 36 is intended to be directed toward the upper table 69 of the suction box 50. The headbox 35 is intended to feed the stock to the surface S of the upper wire 36 after the guide roll 59. The outlet opening 21 of the headbox 35 is intended to be arranged below the guide roller 59. The upper table 69 of the suction box 50 is intended to be located in the upper area of the housing 71 and the dewatering is intended to take place substantially in the direction of the suction box 50.
    A fiber web machine is preferably a board machine, but it may be a special paper machine or a printing paper machine.
    It should be understood that the above description and corresponding figures are intended only to illustrate the present method and arrangement according to the invention. Therefore, the invention is not limited to the above-proposed
    However, many different variations and modifications of the invention, which are possible within the inventive idea defined in the appended claims, will be apparent to those skilled in the art.
    权利要求:
    Claims (10)
    [1]
    claims
    A forming section of a fiber web machine, said forming section (10) comprising a plurality of forming units (24, 34, 44, 54) comprising: - a first forming unit (24) for forming at least one first sheet layer (12 , 13) comprising at least one screen (16), - at least one second forming unit (34) for forming a second web layer (15), the second forming unit (34) comprising: a headbox (35) having a Outlet opening (21), an upper wire (36) running in a loop having a barrel (47) cooperating with the wire (16) of the first forming unit (24) and a lower guide roll (59) a drainage device (50) follows, which is arranged in the loop of the upper sieve (36), characterized in that - the headbox (35) of at least one second forming unit (34) is provided for feeding the stock to the surface (S) of the upper sieve (36) in the B - the discharge opening (21) of the headbox (35) is provided between a portion (45) of the lower guide roller (59) and the sieve (16) of the first Forming unit (24) to be arranged.
    [2]
    A forming section according to claim 1, characterized in that the dewatering means (50) comprises an upper table (69) disposed on the lower side of a housing (71) having suction chambers (74-76) in the loop of the upper screen (36) are located immediately after the lower guide roller (59).
    [3]
    3. Formierpartie according to claim 1 or 2, characterized in that the dewatering device (50) of at least one second forming unit (34) is at least partially of a non-pulsating type.
    [4]
    4. Formierpartie according to claim 2 or 3, characterized in that the upper table (69) has a plurality of bores (29) and / or elongate blades (79) which are separated by gaps (78) from each other.
    [5]
    Forming section according to one of claims 1 to 4, characterized in that an angle of inclination (a) between the upper sieve (36) running in the region of the drainage device (50) and the upper run (23) of the sieve (16 ) Is 1 - 45 °, preferably 5 - 20 °.
    [6]
    6. Formierpartie according to one of claims 1 to 5, characterized in that after the dewatering device (50) a separate connection unit (30) is arranged to the web layer (15) which has been formed by means of at least one second forming unit (34) the at least one web layer (12,13) which is located on the screen (16).
    [7]
    7. forming section according to one of claims 1 to 6, characterized in that the Formierpartie (10) has two to four second forming units (34,44,54).
    [8]
    A forming section according to any one of claims 1 to 7, characterized in that at least part of the second forming units (34) are provided with a movement mechanism (31) for communicating with the screen (16) of the first forming unit (24) bring and remove them accordingly.
    [9]
    A secondary forming unit for a multi-ply forming section of a fiber web machine, the secondary forming unit (34) comprising: a headbox (35) having a discharge opening (21), guide rolls (38, 59) about which an upper wire (36 ), which can be arranged in a loop, - a suction box (50) for draining within the loop of the upper sieve (36), which has a housing (71) and an upper table (69), and in which - the region of the guide roll (59) is provided with the upper sieve (36) running in the direction of the upper table (69) of the suction box (50), characterized in that - the headbox (35) is intended to supplying the stock to the surface (S) of the upper screen (36) in the area of the dewatering means (50) after the guide roller (59), - the discharge opening (21) of the head box (35) is provided below the guide roller (29 ) to be arranged.
    [10]
    A secondary forming unit according to claim 9, characterized in that the upper table (69) of the suction box (59) is arranged to be located in the lower portion of the housing (71) and the drainage is intended to be substantially in Direction of the suction box (59) take place.
    类似技术:
    公开号 | 公开日 | 专利标题
    DE10084722B3|2014-10-23|Method and device for forming a paper web
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    AT505334B1|2010-01-15|TRAINING PART OF A PAPER OR PAPER MACHINE
    AT516646B1|2017-09-15|Formierpartie a fiber web machine and secondary Formierpartie for a Mehrlageformierpartie a fiber web machine
    DE3112972A1|1982-10-14|MULTIPLE NOZZLE FEEDER FOR A PAPER MACHINE
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    同族专利:
    公开号 | 公开日
    CN105714591B|2018-09-07|
    AT516646A3|2017-02-15|
    CN105714591A|2016-06-29|
    FI127630B|2018-10-31|
    AT516646B1|2017-09-15|
    FI20146106A|2016-06-18|
    DE102015121642A1|2016-06-23|
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    法律状态:
    2021-08-15| MM01| Lapse because of not paying annual fees|Effective date: 20201215 |
    优先权:
    申请号 | 申请日 | 专利标题
    FI20146106A|FI127630B|2014-12-17|2014-12-17|Forming section of a fiber web machine and a secondary forming unit for a multiply forming section of a fiber web machine|
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