JP6114793B2 - Paper fabric - Google Patents

Description

  The present invention relates to a papermaking fabric having improved oblique rigidity.

  In the wire part, which is the initial process of paper manufacture by a paper machine, the pulp raw material liquid is spread on the wire, and most of the moisture in the pulp raw material liquid is removed.

  The wire is a woven fabric formed by weaving yarn made of plastic or the like. Efficient and efficient drainage for wire, smoothness to reduce marks on paper, wear resistance to improve durability, rigidity to stabilize dimensions, etc. Is required.

  Patent Document 1 describes a two-layered wire (two-layer fabric for papermaking) having a running surface side fabric and a paper surface side fabric. Since the running surface side fabric is made of thick yarn, it has wear resistance, and the paper-making surface side fabric is made of thin yarn, so it has smoothness, so the entire wire has both wear resistance and smoothness. To do. Further, in this wire, the warp and weft are interwoven so that a part of the warp of the running surface side fabric faces in the oblique direction, thereby improving the rigidity in the oblique direction. Furthermore, the wear resistance is improved by forming a long crimp on the weft of the running surface side fabric.

  Patent Document 2 describes a wire (fabric) having a pair of binding yarns (binder yarns) that connect an upper layer fabric and a lower layer fabric. The pair of binding yarns weave both upper and lower layers in a “double-fist structure” while being interchanged one above the other. It is described that this configuration reduces internal wear between the two layers and improves the bonding between the layers.

JP 2001-2448086 A JP-T-2006-512513

  Thus, although various forms of wires have been proposed, further improvement in quality is required.

Aspect of the present invention is a fabric papermaking comprising a predetermined repetitive pattern (2), a plurality of sets of lower warp yarns of a pair of two adjacent to each other (8), and a plurality of weaving the lower warp A paper surface having a running surface side fabric layer (4) having a lower weft yarn (10), an upper warp yarn (12) and an upper weft yarn (14) interwoven with each other, and being layered on the running surface side fabric layer. A side fabric layer (6), and a weft self-binding yarn (16) for joining the running surface side fabric layer and the papermaking surface side fabric layer, wherein the lower weft is a set of a complete structure. A lower weaving portion (20) for weaving so that it passes over the lower warp yarn, and the weft self-binding yarn weaves three continuous lower warp yarns one by one through the lower, upper and lower portions; And an upper weaving portion (24) for weaving the upper warp. The lower warp yarns in the complete design of the running surface side fabric layer is preferably constituted by four or eight. Furthermore, it is preferable that at least one weft self-binding yarn is disposed between the adjacent lower weft yarns.

  According to this configuration, it is possible to provide a papermaking fabric with improved oblique rigidity.

  Another aspect of the present invention is characterized in that, in the above-described configuration, the upper weaving portion passes over three continuous upper warps.

  According to this configuration, it is possible to provide a papermaking fabric having good drainage, reduction of the outflow of pulp raw material, and smoothness.

  ADVANTAGE OF THE INVENTION According to this invention, the textile fabric for papermaking by which the rigidity of the diagonal direction was improved can be provided.

The photograph seen from the papermaking surface side of the papermaking textiles concerning an embodiment The photograph seen from the running surface side of the papermaking textiles concerning an embodiment Cross-sectional photograph of a papermaking fabric according to an embodiment Latitudinal section photo of a papermaking fabric according to an embodiment Organizational diagram of a papermaking fabric according to an embodiment Schematic diagram of a transverse section of a weft self-binding yarn of a papermaking fabric according to an embodiment Organizational diagram of a papermaking fabric according to a modified embodiment Organizational chart of running surface side fabric layer of comparative examples (ac) and example (d)

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  The wire 2 is a papermaking fabric having an SSB (sheet support binder) structure. The wire 2 forms a structure of a lower traveling surface side fabric layer 4, an upper papermaking surface side fabric layer 6, and an upper papermaking surface side fabric layer 6, and the traveling surface side fabric layer 4 and the papermaking surface side fabric layer. And a self-binding yarn 16 that connects the two. When the wire 2 is attached to the paper machine, the running surface side fabric layer 4 becomes inside and comes into contact with the roll for running the wire 2, and the paper making side fabric layer 6 becomes outside and places the pulp raw material liquid. . FIG. 1 is a photograph of the wire 2 taken from the papermaking surface side, FIG. 2 is a photograph of the wire 2 taken from the running surface side, and FIG. 3 is a photograph of a warp section obtained by cutting the weft of the wire 2. FIG. 4 is a photograph of a weft section obtained by cutting the warp of the wire 2.

  The lower running surface side fabric layer 4 is formed by weaving lower warps 8 and lower wefts 10. In FIG. 5, which is a structure diagram of the wire 2, the warp No. Are the lower warp 8 and the weft no. Are 2 ", 6", 9 ", 13", 16 ", 20", 23 "and 27". 5, the lower warp 8 is included in the complete structure (repeating unit constituting the woven fabric) (four shafts), and each of the lower wefts 10 is two. It consists of 2/2 weaves of a repeated pattern in which one set of lower warp yarns 8 is woven into each set. When one of the adjacent lower wefts 10 passes over a set of lower warp yarns 8, the other lower weft yarn 10 passes under the set of lower warp yarns 8.

  The upper papermaking side fabric layer 6 is basically composed of an upper warp 12 and an upper weft 14 woven together, and a weft self-binding yarn 16 is added thereto. The weft self-binding yarn 16 will be described later. In FIG. Is the upper warp 12 and the weft no. Are 1 ", 3", 5 ", 8", 10 ", 12", 15 ", 17", 19 ", 22", 24 ", 26". As shown in the left figure when viewed from the papermaking side in FIG. 5, after the upper weft 14 passes under one upper warp 12, it repeats 1 / of a repeating pattern that passes over three consecutive upper warps 12. The upper warp yarn 12 and the upper weft yarn 14 are woven together by three weaves. Preferably, the structure of the paper surface side fabric layer 6 is composed of four upper warps 12 and four upper wefts 14, and each of the four consecutive upper wefts 14 is the other three upper wefts. 14 passes under the upper warp 12 different from 14. Specifically, in FIG. 1 "upper weft 14 passes under warp No. 1 'and 9' upper warp 12 and is adjacent to the upper weft 14 of weft No. 1". 3 "upper weft yarn 14 passes under warp No. 3 'and 11' upper warp yarn 12 adjacent to warp No. 1 'and 9' upper warp yarn 12, respectively. In the left view as seen from the side, an upper weft 14 adjacent below a certain upper weft 14 passes under an upper warp 12 adjacent to the left of an upper warp 12 through which a certain upper weft 14 has passed.

  The upper warp 12 is the same number as the lower warp 8, and both are arranged vertically. In FIG. 5, for the sake of convenience, the lower warp 8 and the upper warp 12 are shown at positions slightly shifted from each other in the weft direction. Thereby, the position where the lower weft 10 and the upper weft 14 pass between the lower warp 8 and the upper warp 12 aligned vertically is clarified. For example, weft No. The upper weft 14 of 1 "passes between the upper warp 12 of the warp No. 1 'and the lower warp 8 of the warp No. 2'. This state is above the weft No. 1" in FIG. In the left view of the weft 14 as seen from the papermaking side, the warp No. 1 'hidden under the upper warp 12 and warp no. In the right figure as viewed from the running surface side, the warp no. 1 'covering the upper warp 12 and the warp no. This is shown by hiding under the 2 'lower warp 8.

  The ratio of the number of the upper weft 14 and the lower weft 10 is 3: 2. The upper warp 12 and the upper weft 14 are preferably thinner than the lower warp 8 and the lower weft 10. As a result, it is possible to reduce marks from the paper-making surface side fabric layer 6 on the manufactured paper, and since the lower warp 8 is thick, the running surface side fabric layer 4 has high wear resistance to a roll of a paper machine and the like. Become.

  The weft self-binding yarn 16 connects the running surface side fabric layer 4 and the paper making surface side fabric layer 6 and forms the structure of the paper making surface side fabric layer 6. In FIG. Are 4 ", 7", 11 ", 14", 18 ", 21", 25 ", and 28". FIG. 6 schematically shows a part of the cross section shown in the photograph of FIG. 4 with the lower weft 10 and the upper weft 14 omitted. As shown in FIG. 6, the weft self-binding yarn 16 includes a first intermediate portion 18 passing between a pair of upper and lower lower warps 8 and an upper warp 12, and three consecutive lower warps 8. A lower weaving portion 20 in which the lower warp 8 is woven twice in succession through the lower, upper and lower portions, a second intermediate portion 22 passing between a pair of the lower warp 8 and the upper warp 12 arranged vertically. The upper weaving portions 24 passing over the three continuous upper warp yarns 12 are woven into the lower warp yarn 8 and the upper warp yarn 12 in a repeated pattern. The lower weaving portion 20 of the weft self-binding thread 16 has a W shape in a cross-sectional view.

  As shown in the right view of FIG. 5 as viewed from the traveling surface side, one weft self-binding yarn 16 is arranged between two lower weft yarns 10 adjacent to each other. Further, a set of two lower warps 8 woven into the lower weft 10 are woven so that some of the weft self-binding yarns 16 pass between each other. For example, warp No. A pair of lower warps 8 composed of 2 ′ and 4 ′ warps, Another set of lower warps 8 composed of 6 'and 8' warps is a weft No. The weft self-binding yarn 16 of weft No. 4 "is woven into the lower weft 10 of 2". 2 'on the lower warp 8 and warp no. 4 'under the warp 8 and under the warp No. No. 6 'on the lower warp 8 and warp no. The pair of lower warps 8 that pass through each other pass between each other so as to pass under the lower warps 8 '. Also, some of the other weft self-binding yarns 16 such as weft No. The 7 ″ weft self-binding yarn 16 passes over all of the lower warps 8 (between the lower warp 8 and the upper warp 12 or the upper warp 12) of the warps No. 2 ′ to 8 ′.

  As shown in the left view when viewed from the paper-making surface side in FIG. 5, between two adjacent upper wefts 14, there are a portion where one weft self-binding yarn 16 is arranged and a portion where no one is arranged, The ratio is 3: 2. The weft self-binding yarn 16 and the upper weft yarn 14 adjacent to the weft self-binding yarn 16 in the paper surface side fabric layer 6 are displaced from each other in the position of weaving three continuous upper warps 12. For example, weft No. 11 "weft self-binding yarn 16 passes over warp Nos. 9 ', 11' and 13 'upper warp yarn 12, whereas upper weft 14 of weft No. 10" 11 ', 13' and 15 'pass over the upper warp 12 and the weft No. The upper weft 14 of 12 "passes over the upper warps 12 of warps No. 5 ', 7' and 9 '.

  The lower warp yarn 8, the lower weft yarn 10, the upper warp yarn 12, the upper weft yarn 14 and the weft self-binding yarn 16 are each made of a resin such as a polyamide resin or a polyester resin. Further, monofilaments or multifilaments can be used as these yarns, respectively, but it is preferable to use monofilaments.

  A weft self-binding yarn 16 weaves the lower warp 8 twice in a discontinuous manner to the running surface side fabric layer 4 formed by weaving a set of two lower warps 8 with lower wefts 10. Thereby, the rigidity of the diagonal direction of the wire 2 can be improved. Further, since the weaving of the upper warp 12 by the weft self-binding yarn 16 is similar to the weaving of the upper warp 12 by the upper weft 14, it is possible to suppress a decrease in drainage due to binding, It is possible to suppress marks from being made on paper that is manufactured with smoothness maintained.

  Further, the texture of the paper surface side fabric layer 6 is such that the upper weft 14 passes three above the upper warp 12 and passes under one rather than the plain weave in which the upper weft 14 passes above and below the upper warp 12. A structure such as a / 3 weave is preferable because a large amount of the upper weft is exposed on the papermaking surface side. Thereby, a pulp raw material can be supported more and it leads also to reduction of a raw material outflow.

  FIG. 7 is a modified example of the above embodiment, and is an example in which the running surface side fabric layer in which the lower wefts 10 pass under two of the lower warp yarns 8 and under the six yarns has a 6/2 weave structure. . The paper surface side fabric layer constituted by the upper warp yarn 12 and the upper weft yarn 14 and the weaving method of the weft self-binding yarn 16 into the lower warp yarn 8 and the upper warp yarn 12 are the same as in the above embodiment. This structure is particularly suitable when there is a strong demand for wear resistance. By making the running surface side fabric layer into a 6/2 weave structure, a lot of lower wefts 10 are exposed on the running surface side, and wear resistance is improved.

  In Example 1 and Comparative Example 1, the material of the upper warp, the lower warp, the upper weft, the lower weft, the weft self-binding yarn, the diameter, and the structure of the running surface side fabric layer are the same conditions. The upper warp is a monofilament with a material of PET and a diameter of 0.13 mm, the lower warp is a monofilament with a material of PET and a diameter of 0.13 mm, and the upper weft is a material of PET and a diameter of 0.13 mm A monofilament, and the weft self-binding yarn is a monofilament having a material of PET and a diameter of 0.13 mm. The lower wefts are made of PET and PA, and are alternately arranged with monofilaments having a diameter of 0.22 mm. The structure of the running surface side fabric layer is 2/2 plain weave.

In Example 1 and Comparative Example 1, the structure of the fabric side fabric layer was different. Example 1 was manufactured by 1/3 weaving, and Comparative Example 1 was manufactured by plain weaving. The results are shown in Table 1.

  Despite the fact that the 1/3 weave structure had more wefts than the plain weave, the air permeability was higher. If the air permeability is the same as that of the plain weave, the number of wefts can be increased in the 1/3 weave than the above result of 104/41 / 吋. As a result, more pulp raw material can be supported while maintaining oblique rigidity and freeness (the outflow of the pulp raw material can be reduced).

  A comparative test was conducted between the wire 2 according to the embodiment of the present invention and three comparative examples. FIG. 8 shows (a) the wire 102a of Comparative Example a, (b) the wire 102b of Comparative Example b, (c) the wire 102c of Comparative Example c, and (d) the running surface side of the wire 102d of Example d of the present invention. It is the organization chart seen from. In the following description, the symbols a to d attached to the reference numerals correspond to the comparative examples a to c and d, respectively. When all of the three comparative examples a to c and the example d are shown, the symbols a to d are omitted, and for example, the wire 102 is described.

<Configuration of tested wire 102>
In Example d and Comparative Examples a to c, the material, diameter, and density of the upper warp, the lower warp 108, the upper weft, the lower weft 110, and the weft self-binding yarn 116 are the same conditions. The upper warp is a monofilament with a material of PET and a diameter of 0.22 mm, the lower warp 108 is a monofilament with a material of PET and a diameter of 0.30 mm, and the upper weft is a material of PET and a diameter of 0.22 mm The weft self-binding yarn 116 is a monofilament having a material of PET and a diameter of 0.22 mm. The lower wefts 110 are alternately arranged with monofilaments of PET and PA, each having a diameter of 0.40 mm.

  FIG. 8 is a structure diagram seen from the running surface side where the upper warp and the upper weft are not shown. The papermaking side fabric layer (not shown) of Comparative Examples a to c and Example d has the same configuration as the papermaking side fabric layer 6 of the wire 2 according to the above-described embodiment of the present invention. Comparative Examples a to c and Example d are different from each other in the structure of the running surface side fabric layer 104 and the weaving method of the weft self-binding yarn 116 into the lower warp yarn 108.

  The structure of the running surface side fabric layer 104a of Comparative Example a is 3/1 collapse. That is, each of the lower weft yarns 110a passes under three continuous lower warp yarns 108a and then is woven in a repeating pattern that passes over one lower warp yarn 108a. The weft self-binding yarn 116a passes under one lower warp yarn 108a, passes between a pair of upper and lower lower warp yarns 108a and upper warp yarns, passes over three consecutive upper warp yarns, Two sets of upper and lower adjacent lower warps 108a and upper warps are woven in a repeating pattern. The number of meshes of the wire 102a (the number of yarns per inch) is 48/48 × 73/29 (upper warp / lower warp × (upper weft + weft self-binding yarn) / lower weft). is there.

  The structure of the running surface side fabric layer 104b of Comparative Example b is 2/2 flat. That is, each of the lower wefts 110b weaves a pair of lower warp yarns 108b, each of which is a set of two adjacent ones. The weft self-binding yarn 116b passes under one lower warp yarn 108b, passes between two sets of upper and lower adjacent lower warp yarns 108b and upper warp yarns, passes over three consecutive upper warp yarns, Two sets of upper and lower adjacent lower warps 108b and upper warps are woven in a repeating pattern. The number of meshes of the wire 102b is 48/48 × 73/29.

  The structure of the running surface side fabric layer 104c of Comparative Example c is 2/2 flat. That is, each of the lower wefts 110c weaves one set of lower warp yarns 108c, each of which is a set of two adjacent ones. The weft self-binding yarn 116c passes under two continuous lower warp yarns 108c, passes between a pair of upper and lower lower warp yarns 108c and upper warp yarns, and passes over three consecutive upper warp yarns. And two sets of upper and lower adjacent lower warp yarns 108c and upper warp yarns are woven in a repeating pattern. The number of meshes of the wire 102c is 49/48 × 74/29.

  The configuration of the wire 102d in Example d is the same as that in the above-described embodiment. Specifically, the structure of the running surface side fabric layer 104d is 2/2 flat. That is, each of the lower wefts 110d weaves a pair of lower warp yarns 8 each consisting of a pair of two adjacent ones. The weft self-binding yarn 16 passes under one lower warp yarn 108d, passes between a pair of upper and lower adjacent lower warp yarns 108d and upper warp yarn, passes under one lower warp yarn 108d, 1 A repetitive pattern that passes between the lower warp 108d and the upper warp adjacent to the upper and lower sides of the set, passes over three consecutive upper warps, and passes between the lower warp 108d and the upper warp adjacent to the upper and lower sets. Is interwoven. The number of meshes of the wire 2 is 48/48 × 73/29.

<Result>
In order to compare the rigidity of Comparative Examples a to c and Example d, the bias strength of the wire 102, that is, the load per unit length required to extend 10% in the oblique direction was measured. Table 2 shows the measurement results of the bias intensity in the left oblique direction, the bias intensity in the right oblique direction, and the average bias intensity on the left and right.

The ratio of the left and right average bias intensity was Comparative Example a: Comparative Example b: Comparative Example c: Example d = 1: 1.98: 2.38: 2.55.

  It has been found that the structure of the running surface side fabric layer 104 is 2/2 flat than the 3/1 collapse and the rigidity in the oblique direction is higher. Further, when Comparative Example b and Comparative Example c in which the textures of the running surface side fabric layers 104b and 104c are 2/2 flats are compared, the weft self-binding yarns 116b and 116b are less woven once into the lower warp yarns 108b and 108c. It turned out that the direction of weaving twice increases the rigidity. Further, the structure of the traveling surface side fabric layer 104c is 2/2 flat, and the structure of the traveling surface side fabric layer 4 is 2/2 flat when the weft self-binding yarn 116c weaves the lower warp yarn 108c twice. In comparison with Example d in which the weft self-binding yarn 16 weaves the lower warp yarn 8 discontinuously twice, the rigidity is higher when weaving twice discontinuously than when weaving twice continuously I understood. As described above, Example d had the highest rigidity in the oblique direction.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, the number of upper warps may be larger than that of lower warps. In addition, the way of weaving the weft self-binding yarn and the upper weft into the upper warp may be changed. A plurality of lower wefts may be used as one set, and each set may be woven into the lower warp.

2 ... Wire (paper making fabric)
4 ... Running side fabric layer 6 ... Paper side fabric layer 8 ... Lower warp yarn 10 ... Lower weft yarn 12 ... Upper warp yarn 14 ... Upper weft yarn 16 ... Weft self-binding Thread 20 ... Lower woven portion 24 ... Upper woven portion

Claims (3)

A papermaking fabric having a predetermined repeating pattern,
A traveling surface side fabric layer having a plurality of sets of lower warp yarns, each having two adjacent ones, and a plurality of lower weft yarns for weaving the lower warp yarns;
A paper surface side fabric layer that has an upper warp and an upper weft interwoven with each other, and is stacked on the running surface side fabric layer;
A weft self-binding yarn connecting the running surface side fabric layer and the papermaking surface side fabric layer;
The lower wefts are woven so as to pass over one set of the lower warp yarns in a complete structure, and the weft self-binding yarn passes three consecutive lower warp yarns one by one down, above, and below. And a lower weaving portion that weaves twice and an upper weaving portion that weaves the upper warp through three continuous upper warps . The lower warp yarns in the complete design of the running surface side fabric layer papermaking fabric according to claim 1, characterized in that it is composed of four or eight.   The papermaking fabric according to claim 1 or 2, wherein at least one weft self-binding yarn is disposed between the lower wefts adjacent to each other.