Industrial fabric

Abstract

To provide an industrial woven fabric suppressing the deterioration of surface smoothness while sufficiently securing a force for binding an upper surface side woven fabric and a lower surface side woven fabric.SOLUTION: An industrial fabric comprising an upper side fabric including upper side warps and upper side wefts, a lower side fabric including lower side warps and lower side wefts, and binding warps which bind the upper side fabric and the lower side fabric and constitute a part of the upper side fabric and a part of the lower side fabric comprises a first warp pair consisting of a pair of vertically adjacent binding warps. The industrial fabric includes three first warp pairs arranged in the weft direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to industrial fabrics used in paper machines. [Background technology]

[0002] Conventionally, papermaking meshes woven from warp and weft threads have been widely used as industrial fabrics for papermaking machines. Various characteristics are required of papermaking meshes. For example, Patent Document 1 discloses an industrial two-layer fabric in which multiple warp pairs, each consisting of an upper surface side warp thread and an adjacent lower surface side warp thread, are arranged, with the first warp pair consisting of a warp binding thread joining the upper surface side fabric and the lower surface side fabric, and the second warp pair having no warp binding thread. In the complete design of this industrial two-layer fabric, four sets of first warp pairs and four sets of second warp pairs are arranged. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-017340 Summary of the Invention [Problem to be solved by the invention]

[0004] It is preferable to prevent a decrease in the surface smoothness of the industrial fabric while ensuring the force that binds the upper and lower fabrics together.

[0005] An object of the present invention is to provide an industrial fabric that can suppress a decrease in surface smoothness while ensuring sufficient force to bind the upper and lower fabrics together. [Means for solving the problem]

[0006] In order to solve the above problems, one aspect of the present invention is an industrial woven fabric comprising an upper surface side fabric including upper surface side warps and upper surface side wefts, a lower surface side fabric including lower surface side warps and lower surface side wefts, and binding warps that bind the upper surface side fabric and the lower surface side fabric and form part of the upper surface side fabric and part of the lower surface side fabric, wherein the industrial woven fabric comprises first warp pairs each consisting of a pair of adjacent binding warps vertically, and three first warp pairs arranged in the weft direction. [Effects of the Invention]

[0007] According to the present invention, an industrial woven fabric can be provided that can suppress a decrease in surface smoothness while ensuring a sufficient force for binding the upper surface side fabric and the lower surface side fabric. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a design diagram showing a complete design of an industrial woven fabric according to a first embodiment. [Figure 2] 2 is a cross-sectional view of the industrial fabric shown in FIG. 1 in the warp direction along the warp yarns. [Figure 3] FIG. 10 is a design diagram showing the complete design of an industrial woven fabric according to a second embodiment. [Figure 4] FIG. 4 is a cross-sectional view of the industrial fabric shown in FIG. 3 in the warp direction along the warp yarns. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the following description, "warp yarns" refer to yarns that extend in the direction of paper raw material transport when a multilayer papermaking fabric is used as a loop-shaped belt, and "weft yarns" refer to yarns that extend in a direction crossing the warp yarns. Furthermore, when a multilayer papermaking fabric is used as a papermaking mesh, an "upper-side fabric" refers to the fabric located on the upper side of the papermaking mesh where the paper raw material is transported, and a "lower-side fabric" refers to the fabric located on the lower side of the papermaking belt where the drive roller mainly contacts. The term "surface" simply refers to the exposed side of the upper-side fabric or the lower-side fabric, and the "surface" of the upper-side fabric corresponds to the outer side of the papermaking mesh, and the "surface" of the lower-side fabric corresponds to the inner side of the papermaking mesh.

[0010] Furthermore, a "design pattern" is the smallest repeating unit of a fabric's structure, equivalent to the complete structure of the fabric. In other words, a "woven fabric" is formed by repeating a "complete structure" front to back and side to side. Furthermore, a "knuckle" refers to the part where a warp thread passes over or under one or more weft threads and is exposed on the surface.

[0011] In addition, a "binding warp thread" is at least a part of the warp threads that make up the upper surface side fabric and the lower surface side fabric, and is a thread that binds the upper surface side fabric and the lower surface side fabric together by weaving both the upper surface side fabric and the lower surface side fabric together.

[0012] (First Example) Fig. 1 is a design diagram showing the complete design of an industrial fabric 10 according to Example 1. Fig. 2 is a cross-sectional view of the industrial fabric 10 shown in Fig. 1 in the warp direction along the warp yarns.

[0013] In the design drawings, warp threads are indicated by Arabic numerals, for example, 1, 2, 3... Weft threads are indicated by Arabic numerals with a prime, for example, 1', 2', 3'... Upper surface side threads are indicated by numbers with a U, and lower surface side threads are indicated by numbers with an L, for example, upper surface side warp thread 1U, lower surface side weft thread 2'L, etc. Furthermore, binding threads that bind the upper surface side fabric and the lower surface side fabric together are indicated by numbers with a B, with the first binding warp thread being indicated as Bf and the second binding warp thread being indicated as Bs.

[0014] In the design drawings, an x ​​mark indicates that the upper surface side warp and the first binding warp are arranged above the upper surface side weft, a circle mark indicates that the lower surface side warp and the second binding warp are arranged below the lower surface side weft, a triangle mark indicates that the first binding warp is arranged below the lower surface side weft, and a black triangle mark indicates that the second binding warp is arranged above the upper surface side weft. The x marks, circle marks, triangle marks and black triangle marks indicate knuckles.

[0015] The industrial fabric 10 of the first embodiment shown in Figure 1 comprises an upper surface side fabric comprising upper surface side warps (4U, 8U) and upper surface side wefts (1'U to 8'U), a lower surface side fabric comprising lower surface side warps (4L, 8L) and lower surface side wefts (1'L to 8'L), and binding warps that bind the upper surface side fabric and the lower surface side fabric together.

[0016] The binding warps are woven with both the upper surface side wefts (1'U to 8'U) and the lower surface side wefts (1'L to 8'L). The binding warps include first binding warps (1Bf to 3Bf, 5Bf to 7Bf) and second binding warps (1Bs to 3Bs, 5Bs to 7Bs), and constitute a part of the upper surface side fabric and a part of the lower surface side fabric. In the complete design, there are six first binding warps (1Bf to 3Bf, 5Bf to 7Bf) and six second binding warps (1Bs to 3Bs, 5Bs to 7Bs). The first binding warps (1Bf-3Bf, 5Bf-7Bf) and the second binding warps (1Bs-3Bs, 5Bs-7Bs) are adjacent to each other above and below, and form six pairs of first warps (1-3, 5-7) in the complete design.

[0017] Upper surface side warps (4U, 8U) are woven only with upper surface side wefts (1'U to 8'U). Lower surface side warps (4L, 8L) are woven only with lower surface side wefts (1'L to 8'L). The upper surface side warps (4U, 8U) and the lower surface side warps (4L, 8L) are adjacent to each other vertically, and form two pairs of second warp threads (4, 8) in the complete design, and two of each are used. There are eight of each of the upper surface side wefts (1'U to 8'U) and lower surface side wefts (1'L to 8'L) in the complete design.

[0018] Next, with reference to Figures 2(a) and 2(b), we will explain how to weave the warps and wefts in the industrial woven fabric 10. The arrangements of the upper surface side wefts (1'U to 8'U) and lower surface side wefts (1'L to 8'L) shown in Figures 2(a) and 2(b) are the same.

[0019] Fig. 2(a) shows a form in which the first warp pair of the first binding warp 1Bf and the second binding warp 1Bs is woven into the upper surface side wefts (1'U to 8'U) and the lower surface side wefts (1'L to 8'L). As shown in Fig. 2(a), the first binding warp 1Bf and the second binding warp 1Bs are adjacent to each other vertically to form the first warp pair 1, and cross each other for binding.

[0020] The first binding warp 1Bf passes above the upper surface side wefts (1'U, 7'U) to form two upper surface side knuckles N1, and passes below the upper surface side wefts (2'U to 6'U, 8'U). The first binding warp 1Bf passes below the lower surface side weft 4L to form one lower surface side knuckle N2, and passes above the lower surface side wefts (1'L to 3'L, 5'L to 8'L). In other words, the first binding warp 1Bf forms two upper surface side knuckles N1 in the upper surface side wefts (1'U, 7'U) and one lower surface side knuckle N2 in the lower surface side weft 4'L.

[0021] The first binding warp threads (2Bf to 3Bf, 5Bf to 7Bf) include those whose weaving positions are shifted in the warp direction from the first binding warp thread 1Bf, but they have a common weaving pattern with the first binding warp thread 1Bf, and form two upper surface side knuckles N1 and one lower surface side knuckle N2.

[0022] The second binding warp 1Bs passes above the upper surface side wefts (3'U, 5'U) to form two upper surface side knuckles N1, and passes below the upper surface side wefts (1'U, 2'U, 4'U, 6'U to 8'U). The second binding warp 1Bs passes below the lower surface side weft 8L to form one lower surface side knuckle N2, and passes above the lower surface side wefts (1'L to 7'L). In other words, the second binding warp 1Bs forms two upper surface side knuckles N1 in the upper surface side wefts (3'U, 5'U) and one lower surface side knuckle N2 in the lower surface side weft 8'L.

[0023] The second binding warps (2Bs-3Bs, 5Bs-7Bs) include those whose weaving positions are shifted in the warp direction from the second binding warp 1Bs, but they share a common weaving pattern with the second binding warp 1Bs, forming two upper surface side knuckles N1 and one lower surface side knuckle N2. In this way, the first binding warps (1Bf-3Bf, 5Bf-7Bf) and the second binding warp (1Bs-3Bs, 5Bs-7Bs) form two upper surface side knuckles N1 and one lower surface side knuckle N2, forming a common weaving pattern. The weaving patterns of the first binding warp and the second binding warp are common.

[0024] The first warp pair 1 consisting of the first binding warp 1Bf and the second binding warp 1Bs each forms two upper surface side knuckles N1, thereby forming a weaving pattern in which upper surface side wefts (1'U to 8'U) are woven alternately one by one above and one by one on the surface of the upper surface side fabric. The first warp pair consisting of the first binding warp (2Bf to 3Bf, 5Bf to 7Bf) and the second binding warp (2Bs to 3Bs, 5Bs to 7Bs) also forms a weaving pattern in which upper surface side wefts (1'U to 8'U) are woven alternately one by one above and one by one on the surface of the upper surface side fabric. In this way, the first warp pairs (1 to 3, 5 to 7) form knuckles at regular intervals with respect to the upper surface side wefts (1'U to 8'U), forming a common plain weave weaving pattern and are woven without disrupting the surface design.

[0025] The first warp pair 1, consisting of the first binding warp 1Bf and the second binding warp 1Bs, each forms one lower surface side knuckle N2, thereby passing under one lower surface side weft (4'L, 8'L) and over three consecutive lower surface side wefts (1'L-3'L, 5'L-7'L), forming a weave pattern known as a 1 / 3 weave pattern. The first warp pair, consisting of the first binding warp (2Bf-3Bf, 5Bf-7Bf) and the second binding warp (2Bs-3Bs, 5Bs-7Bs), also forms a weave pattern with a 1 / 3 weave. In this way, the first warp pair (1-3, 5-7) forms knuckles at regular intervals with respect to the lower surface side weft (1'L-8'L), forming a common 1 / 3 weave pattern, and is woven without disrupting the surface weave.

[0026] Figure 2(b) shows a configuration in which the second warp pair 4, consisting of upper surface side warp 4U and lower surface side warp 4L, is woven with upper surface side wefts (1'U to 8'U) and lower surface side wefts (1'L to 8'L). As shown in Figure 2(b), upper surface side warp 4U is woven only with upper surface side wefts (1'U to 8'U), and lower surface side warp 4L is woven only with lower surface side wefts (1'L to 8'L).

[0027] Upper surface side warp 4U passes above upper surface side wefts (2'U, 4'U, 6'U, 8'U) to form upper surface side knuckle N1, and passes below upper surface side wefts (1'U, 3'U, 5'U, 7'U). Upper surface side warp 4U is woven into upper surface side wefts (1'U to 8'U) in a plain weave, forming a weaving pattern on the surface of the upper surface side fabric in which upper surface side wefts (1'U to 8'U) are woven alternately above and below each other.

[0028] The upper surface side warps 8U have the same weaving pattern as the upper surface side warps 4U, and form a weaving pattern in which the upper surface side wefts (1'U to 8'U) are woven alternately one by one above and below each other.

[0029] Lower side warp 4L passes under one lower side weft (3'L, 7'L) to form a lower side knuckle N2, and passes over three consecutive lower side wefts (1'L to 2'L, 4'L to 6'L, 8'L). Lower side warp 4L forms knuckles at regular intervals with respect to the lower side wefts (1'L to 8'L), forming a 1 / 3 weave pattern.

[0030] Lower side warp 8L forms knuckles at regular intervals with lower side wefts (1'L to 8'L) and forms the same 1 / 3 weave pattern as lower side warp 4L.

[0031] The warps located on the upper side, including the upper surface side warps (4U, 8U) and the binding warps (1Bf-3Bf, 5Bf-7Bf, 1Bs-3Bs, 5Bs-7Bs), form a weaving pattern on the surface of the upper surface side fabric, weaving upper surface side wefts one by one above and below. The warps located on the upper side refer to the warps exposed on the upper surface. In other words, the first warp pair (1-3, 5-7) and the second warp pair (4, 8) form a common weaving pattern on the surface of the upper surface side fabric. This improves the surface properties of the upper surface side fabric. Furthermore, by making the surface of the upper surface side fabric plain weave, good smoothness and support for paper fibers are obtained, reducing the number of places where paper fibers can get stuck.

[0032] The warps located on the lower side, including the lower side warps (4L, 8L) and the binding warps (1Bf-3Bf, 5Bf-7Bf, 1Bs-3Bs, 5Bs-7Bs), form a repeated weave pattern on the surface of the lower side fabric, passing under one lower side weft and over three consecutive lower side wefts. The warps located on the lower side refer to warps exposed on the surface of the lower side. In other words, the first warp pair and the second warp pair form a common weave pattern on the surface of the lower side fabric. This increases the number of lower side wefts exposed on the surface of the lower side fabric, improving abrasion resistance compared to plain weave.

[0033] The binding warps are woven into the upper surface side wefts and lower surface side wefts in a common weaving pattern. That is, the first binding warps (1Bf-3Bf, 5Bf-7Bf) and the second binding warps (1Bs-3Bs, 5Bs-7Bs) are woven into the upper surface side wefts (1'U-8'U) in a common weaving pattern to form a plain weave, and the first binding warps (1Bf-3Bf, 5Bf-7Bf) and the second binding warps (1Bs-3Bs, 5Bs-7Bs) are woven into the lower surface side wefts (1'L-8'L) in a common weaving pattern to form a common weaving pattern of a 1 / 3 weave. This makes it possible to prevent deterioration in the surface properties of the industrial woven fabric 10.

[0034] The industrial fabric 10 has a repeating weave pattern formed by three pairs of first warps (1-3, 5-7) arranged in the weft direction and a pair of second warps (4, 8) arranged adjacent to the three pairs of first warps (1-3, 5-7) arranged in the weft direction. That is, the second warp pairs are located between three pairs of first warps, and one pair of second warps is arranged adjacent to each of three consecutive pairs of first warps. In the complete design, six of the eight pairs of warps are binding warps, which improves the binding strength of the upper and lower fabrics compared to industrial fabrics with a lower proportion of binding warps. Increasing the binding strength reduces internal wear caused by friction between the upper and lower fabrics and prevents the worn yarns from fuzzing the surface, which reduces dewatering performance. Furthermore, arranging three pairs of first warp threads in a row ensures the surface smoothness of the upper surface side fabric and improves the smoothness of the resulting paper. For example, if the order is "first warp thread pair, upper surface side warp, first warp thread pair, lower surface side warp," in areas where only the upper surface side warp or the lower surface side warp is present, the lower surface side warp or the upper surface side warp is missing compared to other areas. This causes dehydration to concentrate in the gaps, resulting in uneven dehydration speeds and poor paper texture. Furthermore, grooves form on the fabric surface where the upper surface side warp is missing, which also deteriorates the paper's smoothness. On the other hand, because the industrial fabric 10 is composed of only the first warp thread pair and the second warp thread pair, uneven dehydration speeds are suppressed.

[0035] When viewed in the plane-perpendicular direction of the upper surface side fabric, the overlapping area of ​​the first binding warp threads (1Bf-3Bf, 5Bf-7Bf) and the second binding warp threads (1Bs-3Bs, 5Bs-7Bs) forming the first warp pair is less than 50 percent. The plane-perpendicular direction of the upper surface side fabric is a direction perpendicular to the upper surface side fabric and extends along the up-down direction. For example, the area where the first binding warp thread 1Bf overlaps the second binding warp thread 1Bs in the up-down direction is less than 50 percent of the area of ​​the first binding warp thread 1Bf in a plan view when viewed in the up-down direction, and is also less than 50 percent of the area of ​​the second binding warp thread 1Bs in a plan view when viewed in the up-down direction. Since the industrial fabric 10 has a high proportion of binding warp yarns, if the first binding warp yarns and the second binding warp yarns overlap by less than 50 percent, the first binding warp yarns and the second binding warp yarns will be misaligned in the weft direction, resulting in a closed structure in the industrial fabric 10 and slow dewatering. As a result, when paper material is dropped onto the industrial fabric 10 in the papermaking process, the paper fibers are evenly distributed, resulting in good paper formation.

[0036] More preferably, when viewing the upper surface side fabric in the direction perpendicular to the surface, the overlapping area of ​​the first binding warp threads (1Bf-3Bf, 5Bf-7Bf) and the second binding warp threads (1Bs-3Bs, 5Bs-7Bs) forming the first warp pair may be less than 45 percent.

[0037] The warp density DW of the warp threads including the upper surface side warp threads, the lower surface side warp threads and the binding warp threads calculated by the following formula 1 is 90% or more. DW = (D × M / 25.4) × 100 Formula 1 DW is the warp density, D is the diameter (mm) of the upper surface side warp, lower surface side warp or binding warp, and M is the mesh, which is the number of warp threads per inch. This allows the warp density to be increased, and by shifting the binding warp yarns in the weft direction, the structure of the industrial woven fabric 10 is closed, which slows down dewatering. The warp density DW may preferably be 100% or more.

[0038] The positions of the upper surface side knuckles N1 (marked with "x" and "▲" in FIG. 1) formed by two pairs of first warp threads adjacent in the weft direction are offset by one upper surface side weft in the warp direction. Also, the positions of the upper surface side knuckles N1 (marked with "x" and "▲" in FIG. 1) formed by the first warp thread pairs and the upper surface side warp threads adjacent in the weft direction are offset by one upper surface side weft in the warp direction. In other words, for every warp thread located on the upper surface side that is offset by one in the weft direction, the upper surface side knuckles N1 are offset by one in the warp direction, and the industrial fabric 10 does not form a ribbed weave on the surface of the upper surface side fabric. When the upper surface side knuckles N1 formed by warp threads adjacent in the weft direction are formed at the same position in the warp direction, that is, when the surface of the upper surface side fabric is formed with a ribbed weave, the adjacent warp threads are paired and close to each other, resulting in a gap between the pairs. On the other hand, by arranging the upper surface knuckles N1 evenly and offset in the warp direction for each adjacent pair of warp yarns, the gaps between the pairs are reduced, preventing uneven dewatering speeds and poor paper formation.

[0039] The positions of lower surface side knuckles N2 (marked with circles and triangles in FIG. 1) formed by two pairs of first warps adjacent in the weft direction are offset by one or more lower surface side wefts in the warp direction. Furthermore, the positions of lower surface side knuckles N2 (marked with circles and triangles in FIG. 1) formed by lower surface side wefts and first warp pairs adjacent in the weft direction are offset by one or more lower surface side wefts in the warp direction. In other words, for every warp thread shifted by one thread in the weft direction on the lower side, the lower surface side knuckles N2 are offset by one or more threads in the warp direction, and the industrial fabric 10 does not form a ribbed weave on the surface of the lower surface side fabric. By uniformly positioning the lower surface side knuckles N2 with a warp offset for each pair of adjacent warps, it is possible to prevent uneven dewatering speed and poor paper formation.

[0040] The upper knuckles N1 (marked with x and ▲ in FIG. 1) are arranged so as not to overlap with the lower knuckles N2 (marked with ◯ and △ in FIG. 1) in the vertical direction, thereby preventing the weft yarn, which is pulled toward the inside of the industrial fabric 10 by the knuckles, from rubbing against the weft yarn.

[0041] (Second Example) Fig. 3 is a design diagram showing the complete design of the industrial fabric 100 according to the second embodiment. Fig. 4 is a cross-sectional view of the industrial fabric 100 shown in Fig. 3 in the warp direction along the warp yarns.

[0042] The industrial fabric 100 of the second embodiment shown in Figure 3 is the same as the industrial fabric 10 shown in Figure 1 in that it has six first warp pairs (1-3, 5-7) and two second warp pairs (4, 8), but the warp weaving pattern is different.

[0043] The first warp pairs (1-3, 5-7) are composed of six pairs of first binding warps (1Bf-3Bf, 5Bf-7Bf) and second binding warps (1Bs-3Bs, 5Bs-7Bs) adjacent to each other above and below. The second warp pairs (4, 8) are composed of two pairs of upper surface side warps (4U, 8U) and lower surface side warps (4L, 8L) adjacent to each other above and below.

[0044] Fig. 4(a) shows a configuration in which the first warp pair 1, consisting of the first binding warp 1Bf and the second binding warp 1Bs, is woven with the upper surface side wefts (1'U to 8'U) and the lower surface side wefts (1'L to 8'L). The first binding warp 1Bf passes above the upper surface side weft 1'U to form one upper surface side knuckle N1 and passes below the upper surface side wefts (2'U to 8'U). The first binding warp 1Bf also passes below the lower surface side weft 5'L to form one lower surface side knuckle N2 and passes above the lower surface side wefts (1'L to 4'L, 6'L to 8'L).

[0045] The first binding warp threads (2Bf to 3Bf, 5Bf to 7Bf) include those whose weaving positions are shifted in the warp direction from the first binding warp thread 1Bf, but they have a common weaving pattern with the first binding warp thread 1Bf, and form one upper surface side knuckle N1 and one lower surface side knuckle N2.

[0046] The second binding warp 1Bs passes above the upper surface side weft 5'U to form one upper surface side knuckle N1, and passes below the upper surface side wefts (1'U to 4'U, 6'U to 8'U). The second binding warp 1Bs passes below the lower surface side weft 1'L to form one lower surface side knuckle N2, and passes above the lower surface side wefts (2'L to 8'L). In other words, the second binding warp 1Bs forms one upper surface side knuckle N1 and one lower surface side knuckle N2.

[0047] The second binding warps (2Bs to 3Bs, 5Bs to 7Bs) include those whose weaving positions are shifted in the warp direction from the second binding warp 1Bs, but have a common weaving pattern with the second binding warp 1Bs, and form one upper surface side knuckle N1 and one lower surface side knuckle N2. The weaving patterns of the first binding warp and the second binding warp are common.

[0048] The first warp pair 1 consisting of the first binding warp 1Bf and the second binding warp 1Bs each forms one upper surface side knuckle N1, thereby forming a weave pattern in which it passes over one upper surface side weft (1'U, 5'U) and under three consecutive upper surface side wefts (2'U-4'U, 6'U-8'U), forming a so-called 1 / 3 weave pattern.The first warp pair consisting of the first binding warp (2Bf-3Bf, 5Bf-7Bf) and the second binding warp (2Bs-3Bs, 5Bs-7Bs) also forms a 1 / 3 weave pattern.

[0049] The first warp pair 1 consisting of the first binding warp 1Bf and the second binding warp 1Bs each forms one lower surface side knuckle N2, thereby passing under one lower surface side weft (1'L, 5'L) and under three consecutive lower surface side wefts (2'L-4'L, 6'L-8'L), forming a weave pattern of 1 / 3. The first warp pair consisting of the first binding warp (2Bf-3Bf, 5Bf-7Bf) and the second binding warp (2Bs-3Bs, 5Bs-7Bs) also forms a weave pattern of 1 / 3.

[0050] FIG. 4(b) shows a configuration in which the second warp pair 4 of upper surface side warp 4U and lower surface side warp 4L is woven with upper surface side wefts (1'U to 8'U) and lower surface side wefts (1'L to 8'L).

[0051] Upper surface side warp 4U passes over one upper surface side weft (3'U, 7'U) to form an upper surface side knuckle N1, and passes under three consecutive upper surface side wefts (1'U to 2'U, 4'U to 6'U, 8'U) to form a 1 / 3 weave pattern. Upper surface side warp 8U has the same weave pattern as upper surface side warp 4U.

[0052] Lower side warp 4L passes under one lower side weft (3'L, 7'L) to form a lower side knuckle N2, and passes over three consecutive lower side wefts (1'L to 2'L, 4'L to 6'L, 8'L) to form a 1 / 3 weave pattern. Lower side warp 8L forms the same 1 / 3 weave pattern as lower side warp 4L.

[0053] The industrial fabric 100 has a repeating weaving pattern formed by three first warp pairs (1-3, 5-7) arranged in the weft direction and a second warp pair (4, 8) arranged adjacent to the three first warp pairs (1-3, 5-7) arranged in the weft direction. This increases the proportion of binding warp yarns and improves the binding force. Furthermore, by spacing the second warp pairs apart, the surface smoothness of the upper surface side fabric can be ensured.

[0054] The positions of the upper surface side knuckles N1 (marked with "x" and "▲" in Fig. 3) formed by two pairs of first warps adjacent in the weft direction are offset by one or more upper surface side wefts in the warp direction. Also, the positions of the upper surface side knuckles N1 (marked with "x" and "▲" in Fig. 3) formed by the first warp pair and an upper surface side warp adjacent in the weft direction are offset by one or more upper surface side wefts in the warp direction. By arranging the upper surface side knuckles N1 so that they are offset in the warp direction for each adjacent pair of warps, it is possible to prevent uneven dewatering speed and poor paper formation.

[0055] The positions of lower surface side knuckles N2 (marked with circles and triangles in Fig. 3) formed by two pairs of first warps adjacent in the weft direction are offset by one or more lower surface side wefts in the warp direction. Also, the positions of lower surface side knuckles N2 (marked with circles and triangles in Fig. 3) formed by lower surface side wefts and first warp pairs adjacent in the weft direction are offset by one or more lower surface side wefts in the warp direction. By arranging the lower surface side knuckles N2 so that they are offset in the warp direction for each adjacent pair of warps, it is possible to prevent uneven dewatering speed and poor paper formation.

[0056] The industrial fabrics according to the above-described embodiments may be subjected to the following processes. For example, to improve the surface smoothness, the surface side of the industrial fabric may be polished to a depth of 0.02 to 0.05 mm. It is particularly preferable that the surface side be polished to a depth of 0.02 mm or 0.03 mm.

[0057] In addition, to prevent fraying of the threads at the edge of the net (industrial fabric), the area from the edge of the net to 5 to 30 mm (particularly 5 mm, 10 mm, or 20 mm) may be reinforced by coating with polyurethane resin. The edge of the net may be coated on one or both sides. The resin may be hot-melt polyurethane.

[0058] To improve the abrasion resistance of the mesh ends, an area 20 mm to 500 mm from the mesh end (particularly 25, 50, 75, 100, 150, 250, 300, 350, and 400 mm away) may be coated over the entire length with 3 to 16 (particularly 3, 4, 7, 8, 10, 12, 15, and 16) strips of resin about 7 mm wide. The aforementioned multiple strips of polyurethane resin may be applied to both ends of the mesh, or just one side. The resin may be hot-melt polyurethane.

[0059] To improve stain resistance, the entire mesh may be coated with a resin. To allow trimming of the papermaking width near the mesh edge, an area 10 to 500 mm from the mesh edge (particularly 10, 15, 20, 25, 30, 40, 50, 75, 100, 150, 200, 250, 300, 350, and 400 mm) may be coated with a single strip of resin approximately 3, 5, 7, 10, 15, or 20 mm wide over the entire length. The resin may be applied to both ends of the mesh or only one side. The resin may be polyurethane or a hot melt. To identify any creases in the mesh during use, a line approximately 25 mm or 50 mm wide may be drawn across the entire width of the mesh.

[0060] The following is a list of preferred ranges of elements for industrial woven fabrics. The diameter of the warp threads (including upper surface side warps, lower surface side warps, first binding warps, and second binding warps) is preferably 0.10 to 1.0 mm, more preferably 0.1 to 0.5 mm, and particularly preferably 0.11 to 0.35 mm. The diameters of the warps may be the same. The diameter of the lower surface side warps may be the same as the diameter of the upper surface side warps, or may be set to 1.1 to 1.3 times the diameter of the upper surface side warps. The diameter of the weft threads is preferably 0.10 to 1.0 mm, more preferably 0.12 to 0.6 mm, and particularly preferably 0.12 to 0.55 mm. The diameter of the lower surface side weft is desirably larger than the diameter of the upper surface side weft, and may be 1.1 to 3.0 times the diameter of the upper surface side weft, more preferably 1.2 to 2.0 times the diameter of the upper surface side weft.

[0061] The upper surface side weft may be made of only PET wire, only polyamide wire, or a mixture of PET wire and polyamide wire woven alternately. The lower surface side weft may be made of only PET wire, only polyamide wire, or a mixture of PET wire and polyamide wire woven alternately. Furthermore, a low-friction yarn may be woven into the lower surface side weft to reduce the driving load on the machine.

[0062] The air permeability is preferably 100 cm3 / cm2 / s to 600 cm3 / cm2 / s, and more preferably 120 cm3 / cm2 / s to 300 cm3 / cm2 / s.

[0063] The mesh thickness is preferably 0.3 mm to 3.0 mm, more preferably 0.5 mm to 2.5 mm, and particularly preferably 0.5 mm to 1.0 mm. The main uses are as a papermaking or nonwoven fabric belt, and in particular, it may be used as a papermaking dewatering belt or a spunbond nonwoven fabric conveying belt.

[0064] The cross-sectional shapes of the warp and weft yarns in the above-mentioned embodiments are not limited to circular, and may be square, star-shaped, elliptical, hollow, core-sheath, etc. In particular, by making the cross-sectional shape of the lower warp yarns square, rectangular, or elliptical, the cross-sectional area of ​​the yarns can be increased, improving elongation resistance and rigidity.

[0065] The yarn material can also be freely selected within a range that satisfies the desired characteristics, and examples thereof include polyethylene terephthalate, polyester, polyamide, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, aramid, polyether ether ketone, polyethylene naphthalate, polytetrafluoroethylene, cotton, wool, metal, thermoplastic polyurethane, and thermoplastic elastomer. Of course, it is also possible to use copolymers or yarns in which various substances are blended or contained in these materials depending on the purpose. Generally, polyester monofilaments, which have rigidity and excellent dimensional stability, are preferably used for yarns constituting industrial woven fabrics. [Explanation of symbols]

[0066] 1Bf first binding warp, 1Bs second binding warp, 1'U upper surface side weft, 1'L lower surface side weft, 4U upper surface side warp, 4L lower surface side warp, 10 industrial fabric.

Claims

1. an upper surface side fabric including upper surface side warps and upper surface side wefts; a lower side fabric including lower side warps and lower side wefts; An industrial woven fabric comprising: binding warp yarns that bind the upper surface side fabric and the lower surface side fabric together and that constitute a part of the upper surface side fabric and a part of the lower surface side fabric, a first warp pair consisting of a pair of adjacent binding warps in the vertical direction, An industrial woven fabric comprising three pairs of first warp yarns arranged in the weft direction.

2. a second warp pair consisting of the upper surface side warp and the lower surface side warp adjacent to each other in the vertical direction; the upper surface side warp is woven with only the upper surface side weft, the lower surface side warp is woven with only the lower surface side weft, 2. The industrial fabric according to claim 1, further comprising the second warp yarn pairs arranged adjacent to the first warp yarn pairs, which are arranged in three pairs in the weft direction.

3. The pair of binding warps forming the first warp pair is composed of a first binding warp and a second binding warp, 3. The industrial fabric according to claim 1, wherein when the upper surface side fabric is viewed in the perpendicular direction, the area in which the first binding warp yarn and the second binding warp yarn overlap in a plan view is less than 50 percent.

4. 3. The industrial woven fabric according to claim 1, wherein the warp density of the warp yarns including the upper surface side warp yarns, the lower surface side warp yarns and the binding warp yarns calculated by the following formula 1 is 90% or more. DW = (D x M / 25.4) x 100 Formula 1 The DW is the warp density, the D is the diameter (millimeters) of the upper surface side warp, the lower surface side warp or the binding warp, and the M is the mesh, which is the number of warp threads per inch.

5. 3. The industrial woven fabric according to claim 1, wherein the binding warp yarns are woven with the upper surface side wefts and the lower surface side wefts in a common weaving pattern.

6. the binding warp passes above the upper surface side weft to form an upper surface side knuckle; The industrial fabric according to claim 1 or 2, characterized in that the position of the upper surface side knuckle formed by two pairs of the first warp yarns adjacent in the weft direction has a shift of one or more of the upper surface side weft yarns in the warp direction.

7. the upper surface side warp and the binding warp pass above the upper surface side weft to form an upper surface side knuckle; The industrial fabric according to claim 1 or 2, characterized in that the position of the upper surface side knuckle formed by the first warp pair and the upper surface side warp adjacent in the weft direction has a shift of one or more of the upper surface side wefts in the warp direction.

8. 3. The industrial woven fabric according to claim 1, wherein the first warp pairs each form a common weaving pattern with respect to the upper surface side weft.

9. 3. The industrial woven fabric according to claim 2, wherein the first warp pair and the second warp pair each form a common weaving pattern with respect to the upper surface side weft.

10. The industrial fabric according to claim 1 or 2, characterized in that the warp yarns located on the upper surface side, including the upper surface side warp yarns and the binding warp yarns, form a weaving pattern in which the upper surface side weft yarns are woven one above and one below the other.

11. the lower surface side warp and the binding warp pass below the lower surface side weft to form a lower surface side knuckle; The industrial fabric according to claim 1 or 2, characterized in that the position of the lower surface side knuckle formed by two pairs of the first warp yarns adjacent in the weft direction has a shift of one or more of the lower surface side weft yarns in the warp direction.

12. the lower surface side warp and the binding warp pass below the lower surface side weft to form a lower surface side knuckle; The industrial fabric according to claim 2, characterized in that the position of the lower side knuckle formed by the lower side warp yarn and the first warp yarn pair adjacent in the weft direction has a shift of one or more lower side weft yarns in the warp direction.

13. 3. The industrial woven fabric according to claim 1, wherein the first warp pairs each form a common weaving pattern with respect to the lower surface side weft.

14. 3. The industrial woven fabric according to claim 2, wherein the first warp pair and the second warp pair each form a common weaving pattern with respect to a lower surface side weft.

15. An industrial woven fabric as described in claim 1 or 2, characterized in that the warp yarns located on the lower side, including the lower side warp yarn and the binding warp yarn, repeatedly form a weaving pattern in which they pass under one lower side weft yarn and over three consecutive lower side weft yarns.

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