Industrial multilayer fabric

Abstract

To provide an industrial multilayer fabric which can suppress a first binding warp yarn and a second binding warp yarn constituting a pair from being away from each other in the length direction.SOLUTION: A first binding warp yarn and a second binding warp yarn constituting a pair function as a warp yarn respectively woven in an upper surface side weft yarn and positioned at an upper surface side constituting an upper surface side layer and function as a warp yarn respectively woven in a lower surface side weft yarn and positioned at a lower surface side constituting a lower surface side layer, and a pair of the first binding warp yarn and the second binding warp yarn are arranged alternately with a lower surface side warp yarn. In the first binding warp yarn, a lower surface side warp yarn neighboring on the left side forms a knuckle to a lower surface side weft yarn forming one knuckle, a lower surface side warp yarn neighboring on the right side forms a knuckle to a lower surface side weft yarn forming one knuckle. In the second binding warp yarn, a lower surface side warp yarn neighboring on the left side forms a knuckle to a lower surface side weft yarn forming one knuckle and a lower surface side warp yarn neighboring on the right side forms a knuckle to a lower surface side weft yarn forming one knuckle.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an industrial multi-layer fabric for use in paper machines. [Background technology]

[0002] Conventionally, papermaking nets woven with warp and weft threads have been widely used as industrial multilayer fabrics used in papermaking machines. Various characteristics are required for papermaking nets, and for example, Patent Document 1 discloses an industrial fabric in which an upper side fabric consisting of an upper side warp thread and an upper side weft thread is bonded to a lower side fabric consisting of a lower side warp thread and a lower side weft thread. In this industrial fabric, the upper side warp thread is an upper side binding thread that bonds the upper side fabric and the lower side fabric, and the lower side warp thread includes a lower side binding thread that bonds the upper side fabric and the lower side fabric, and a warp thread that is not a binding thread.

[0003] In the industrial woven fabric shown in Fig. 1 of Patent Document 1, for example, an upper surface side binding yarn 4Ub and a lower surface side binding yarn 5Lb are paired to complement each other and form one weaving pattern. The upper surface side binding yarn 4Ub forms a lower surface side knuckle in the same lower surface side weft as the adjacent lower surface side warp 3L, and the lower surface side binding yarn 5Lb forms a lower surface side knuckle in the same lower surface side weft as the adjacent lower surface side warp 6L. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-15983 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology described in Patent Document 1, upper side binding yarn 4Ub is shifted to the left side to form a lower side knuckle with the same lower side weft as the adjacent lower side warp 3L, and lower side binding yarn 5Lb is shifted to the right side to form a lower side knuckle with the same lower side weft as the adjacent lower side warp 6L. Therefore, the pair of upper side binding yarn 4Ub and lower side binding yarn 5Lb is separated in the weft direction, which hinders dewatering and may cause marks.

[0006] An object of the present invention is to provide an industrial multi-layer fabric which prevents a pair of first and second binding warp yarns from separating in the weft direction, thereby preventing the occurrence of marks. [Means for solving the problem]

[0007] In order to solve the above problems, one embodiment of the present invention is an industrial multilayer fabric in which an upper surface side layer and a lower surface side layer are formed by weaving warp and weft. The weft has an upper surface side weft constituting a part of the upper surface side layer, and a lower surface side weft constituting a part of the lower surface side layer. The warp has a first binding warp thread woven into the upper surface side weft and the lower surface side weft, a second binding warp thread woven into the upper surface side weft and the lower surface side weft and paired with the first binding warp thread up and down, and a lower surface side warp thread woven into the lower surface side weft and arranged adjacent to the pair of the first binding warp thread and the second binding warp thread. The first binding warp thread and the second binding warp thread forming the pair are woven into the upper surface side weft and function as warps located on the upper surface side constituting the upper surface side layer, and are woven into the lower surface side weft and function as warps located on the lower surface side constituting the lower surface side layer. The pair of first and second binding warps and the lower side warp are arranged alternately. The first binding warp forms a knuckle with the lower side weft with which the adjacent lower side warp on the left forms a knuckle, and forms a knuckle with the lower side weft with which the adjacent lower side warp on the right forms a knuckle. The second binding warp forms a knuckle with the lower side weft with which the adjacent lower side warp on the left forms a knuckle, and forms a knuckle with the lower side weft with which the adjacent lower side warp on the right forms a knuckle. Effect of the Invention

[0008] According to the present invention, it is possible to provide an industrial multilayer fabric in which a pair of a first binding warp yarn and a second binding warp yarn are prevented from separating in the weft direction. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a design diagram showing a complete design of an industrial multilayer fabric according to a first embodiment. [Diagram 2] Fig. 2(a) is a diagram showing a state in which the left binding warp thread 1Bl and the right binding warp thread 1Br in the design diagram shown in Fig. 1 are woven into the upper surface side weft and the lower surface side weft. Fig. 2(b) is a diagram showing a state in which the lower surface side warp thread 2L in the design diagram shown in Fig. 1 is woven into the lower surface side weft. [Diagram 3] Fig. 3(a) is a diagram showing a state in which the left binding warp thread 3Bl and the right binding warp thread 3Br in the design diagram shown in Fig. 1 are woven into the upper surface side weft and the lower surface side weft. Fig. 3(b) is a diagram showing a state in which the lower surface side warp thread 4L in the design diagram shown in Fig. 1 is woven into the lower surface side weft. [Figure 4] FIG. 11 is a design diagram showing a complete design of an industrial multilayer fabric according to a second embodiment. [Diagram 5] Fig. 5(a) is a diagram showing a state in which the left binding warp thread 1Bl and the right binding warp thread 1Br in the design diagram shown in Fig. 4 are woven into the upper surface side weft and the lower surface side weft. Fig. 5(b) is a diagram showing a state in which the lower surface side warp thread 2L in the design diagram shown in Fig. 4 is woven into the lower surface side weft. [Figure 6] Fig. 6(a) is a diagram showing a state in which the left binding warp thread 3Bl and the right binding warp thread 3Br in the design diagram shown in Fig. 4 are woven into the upper surface side weft and the lower surface side weft. Fig. 6(b) is a diagram showing a state in which the lower surface side warp thread 4L in the design diagram shown in Fig. 4 is woven into the lower surface side weft. [Figure 7] FIG. 11 is a design diagram showing a complete design of an industrial multilayer fabric according to a third embodiment. [Figure 8] Fig. 8(a) is a diagram showing a state in which the left binding warp thread 1Bl and the right binding warp thread 1Br in the design drawing shown in Fig. 7 are woven into the upper surface side weft and the lower surface side weft. Fig. 8(b) is a diagram showing a state in which the lower surface side warp thread 2L shown in Fig. 7 is woven into the lower surface side weft. [Figure 9] Fig. 9(a) is a diagram showing a state in which the left binding warp thread 3Bl and the right binding warp thread 3Br in the design diagram shown in Fig. 7 are woven into the upper surface side weft and the lower surface side weft. Fig. 9(b) is a diagram showing a state in which the lower surface side warp thread 4L in the design diagram shown in Fig. 7 is woven into the lower surface side weft. [Figure 10] FIG. 11 is a design diagram showing the complete design of an industrial multilayer fabric according to a fourth embodiment. [Figure 11] Fig. 11(a) is a diagram showing a configuration in which the left binding warp thread 1Bl and the right binding warp thread 1Br in the design drawing shown in Fig. 10 are woven into the upper surface side weft and the lower surface side weft. Fig. 11(b) is a diagram showing a configuration in which the lower surface side warp thread 2L shown in Fig. 10 is woven into the lower surface side weft. [Figure 12] Fig. 12(a) is a diagram showing a state in which the left binding warp thread 3Bl and the right binding warp thread 3Br in the design diagram shown in Fig. 10 are woven into the upper surface side weft and the lower surface side weft. Fig. 12(b) is a diagram showing a state in which the lower surface side warp thread 4L in the design diagram shown in Fig. 10 is woven into the lower surface side weft. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In the following description, "warp threads" are threads extending along the direction of transport of the paper raw material when the multilayered papermaking fabric is used as a loop-shaped belt, and "weft threads" are threads extending in a direction crossing the warp threads. In addition, when the multilayered fabric is used as a papermaking net, the "upper side layer" is a layer located on the upper side of the papermaking net where the paper raw material is transported, and the "lower side layer" is a layer located on the lower side of the papermaking belt where the driving roller mainly contacts. The upper side layer may be the upper side fabric, and the lower side layer may be the lower side fabric. In addition, the "surface" simply refers to the exposed side of the upper side layer or the lower side layer, and the "surface" of the upper side layer corresponds to the outer side of the papermaking net, and the "surface" of the lower side layer corresponds to the inner side of the papermaking net.

[0011] In addition, a "design pattern" is the smallest repeating unit of a woven fabric and corresponds to the complete structure of the fabric. In other words, a "woven fabric" is formed by repeating a "complete structure" back and forth and left and right. In addition, 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.

[0012] In addition, the "binding warp yarn" refers to at least a portion of the warp yarns constituting the upper side layer and the lower side layer, and is a yarn that binds the upper side layer and the lower side layer by weaving in both the upper side weft and the lower side weft.

[0013] (First Example) FIG. 1 is a design drawing showing a complete structure of an industrial multilayer fabric according to a first embodiment. In the design drawing, warp yarns are indicated by Arabic numerals, for example, 1, 2, 3... Weft yarns are indicated by Arabic numerals with a dash, for example, 1', 2', 3'... Upper surface side yarns are indicated by numerals with U, and lower surface side yarns are indicated by numerals with L, for example, upper surface side weft 1'U, lower surface side warp 2L, etc. Binder yarns that connect the upper surface side layer and the lower surface side layer are indicated by numerals with B, the left binder warp yarn is indicated as Bl, and the right binder warp yarn is indicated as Br. The left binder warp yarn and the right binder warp yarn are paired side by side, with the left binder warp yarn located on the left side of the pair and the right binder warp yarn located on the right side of the pair. The left and right binding warp threads that make up a pair partially overlap each other, but at the intersection the left binding warp thread is on the left and the right binding warp thread is on the right. This is because industrial multi-layer fabrics are woven with the weft threads woven into them with the warps lined up side by side. Note that one of the left and right binding warp threads is sometimes called the first binding warp thread, and the other is sometimes called the second binding warp thread.

[0014] In the design drawings, an X mark indicates that the left binding warp thread is placed above the upper surface side weft, an O mark indicates that the lower surface side warp thread and the right binding warp thread are placed below the lower surface side weft, an △ mark indicates that the left binding warp thread is placed below the lower surface side weft, and an ▲ mark indicates that the right binding warp thread is placed above the upper surface side weft. The X marks, O marks, △ marks and ▲ marks indicate warp knuckles.

[0015] The multi-layered industrial fabric according to the first embodiment shown in Fig. 1 is constructed by weaving warps and wefts to form an upper side layer and a lower side layer. The multi-layered industrial fabric is constructed of an upper side layer including left-side binding warps (1Bl, 3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl), right-side binding warps (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br), and upper side wefts (1'U to 24'U); and a lower side layer including lower side warps (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br), lower side warps (2L, 4L, 6L, 8L, 10L, 12L, 14L, 16L), and lower side wefts (1'L, 2'L, 4'L, 5'L, 7'L, 8'L, 10'L, 11'L, 13'L, 14'L, 16'L, 17'L, 19'L, 20'L, 22'L, 23'L).

[0016] The warp yarns include left binding warp yarns (1Bl, 3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl) woven with upper surface side wefts and lower surface side wefts, right binding warp yarns (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br) woven with upper surface side wefts and lower surface side wefts, and lower surface side warp yarns (2L, 4L, 6L, 8L, 10L, 12L, 14L, 16L) woven only with lower surface side wefts. The warp yarns do not include upper surface side warp yarns woven only with upper surface side wefts.

[0017] The left binding warp threads (1Bl, 3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl) and the right binding warp threads (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br) are woven into both the upper surface side wefts (1'U to 24'U) and the lower surface side wefts (1'L, 2'L, 4'L, 5'L, 7'L, 8'L, 10'L, 11'L, 13'L, 14'L, 16'L, 17'L, 19'L, 20'L, 22'L, 23'L). In the complete weave, there are eight left binding warp threads and eight right binding warp threads. The left binding warp threads and the right binding warp threads are vertically adjacent to each other to form eight pairs.

[0018] The lower side warps (2L, 4L, 6L, 8L, 10L, 12L, 14L, 16L) are eight in number in the complete design, and are arranged adjacent to pairs of left and right binding warps and alternately with pairs of left and right binding warps.

[0019] The wefts include upper surface side wefts (1'U to 24'U) which form a part of the upper side layer, and lower surface side wefts (1'L, 2'L, 4'L, 5'L, 7'L, 8'L, 10'L, 11'L, 13'L, 14'L, 16'L, 17'L, 19'L, 20'L, 22'L, 23'L) which form a part of the lower side layer. In the complete design, there are 24 upper surface side wefts and 16 lower surface side wefts, and the ratio of upper surface side wefts to lower surface side wefts is 3:2.

[0020] The pair of left and right binding warps and the lower side warp are alternately arranged in the weft direction. By arranging the lower side warp between the pair of binding warps, the dewatering property of the industrial multi-layer fabric can be improved.

[0021] In the complete weft design, the upper surface side weft has a shaft of 24. By setting the shaft number of the weft to be longer, the crossing portion of the left and right binding warps can be dispersed.

[0022] Next, the weaving method of each warp and each weft in the industrial multilayer fabric of Example 1 will be described with reference to Figures 2(a), 2(b), 3(a) and 3(b). The arrangement of the upper surface side wefts and the lower surface side wefts shown in Figures 2(a), 2(b), 3(a) and 3(b) is the same.

[0023] Figure 2(a) shows a form in which the left binding warp thread 1Bl and the right binding warp thread 1Br are woven into the upper surface side wefts (1'U to 24'U) and the lower surface side wefts (1'L, 2'L, 4'L, 5'L, 7'L, 8'L, 10'L, 11'L, 13'L, 14'L, 16'L, 17'L, 19'L, 20'L, 22'L, 23'L). As shown in Figure 2(a), the left binding warp thread 1Bl and the right binding warp thread 1Br are adjacent to each other vertically to form a pair and cross each other for binding.

[0024] The left binding warp thread 1Bl passes above the upper surface side wefts (2'U, 4'U, 6'U, 20'U, 22'U, 24'U) to form six upper surface side knuckles, and passes below the upper surface side wefts (1'U, 3'U, 5'U, 7'U to 19'U, 21'U, 23'U). The left binding warp thread 1Bl passes below the lower surface side wefts (11'L, 16'L) to form two lower surface side knuckles, and passes above the lower surface side wefts (1'L, 2'L, 4'L, 5'L, 7'L, 8'L, 10'L, 13'L, 14'L, 17'L, 19'L, 20'L, 22'L, 23'L). In other words, the left binding warp yarn 1Bl forms six upper side knuckles in the upper side wefts (2'U, 4'U, 6'U, 20'U, 22'U, 24'U) and two lower side knuckles in the lower side wefts (11'L, 16'L).

[0025] The right binding warp thread 1Br passes above the upper surface side wefts (8'U, 10'U, 12'U, 14'U, 16'U, 18'U) to form six upper surface side knuckles, and passes below the upper surface side wefts (1'U to 7'U, 9'U, 11'U, 13'U, 15'U, 17'U, 19'U to 24'U). The right binding warp thread 1Br passes below the lower surface side wefts (4'L, 23'L) to form two lower surface side knuckles, and passes above the lower surface side wefts (1'L, 2'L, 5'L, 7'L, 8'L, 10'L, 11'L, 13'L, 14'L, 16'L, 17'L, 19'L, 20'L, 22'L). That is, the right binding warp yarn 1Br forms six upper side knuckles in the upper side wefts (8'U, 10'U, 12'U, 14'U, 16'U, 18'U) and two lower side knuckles in the lower side wefts (4'L, 23'L).

[0026] Fig. 2(b) shows a form in which lower side warp 2L is woven into lower side wefts (1'L, 2'L, 4'L, 5'L, 7'L, 8'L, 10'L, 11'L, 13'L, 14'L, 16'L, 17'L, 19'L, 20'L, 22'L, 23'L). Lower side warp 2L passes under lower side wefts (4'L, 8'L, 16'L, 20'L) to form four lower side knuckles, and passes over lower side wefts (1'L, 2'L, 5'L, 7'L, 10'L, 11'L, 13'L, 14'L, 17'L, 19'L, 22'L, 23'L).

[0027] Lower side warp 2L passes under one lower side weft (4'L, 16'L), over two consecutive lower side wefts ("5'L, 7'L", "17'L, 19'L"), under one lower side weft (8'L, 20'L), and over four consecutive lower side wefts ("10'L, 11'L, 13'L, 14'L", "22'L, 23'L, 1'L, 2'L"), forming a weave pattern in the lower side layer, a so-called 1 / 2-1 / 4 weave pattern.

[0028] Figure 3(a) shows a form in which the left binding warp thread 3Bl and the right binding warp thread 3Br are woven into the upper surface side wefts (1'U to 24'U) and the lower surface side wefts (1'L, 2'L, 4'L, 5'L, 7'L, 8'L, 10'L, 11'L, 13'L, 14'L, 16'L, 17'L, 19'L, 20'L, 22'L, 23'L). As shown in Figure 3(a), the left binding warp thread 3Bl and the right binding warp thread 3Br are adjacent to each other vertically to form a pair and cross each other for binding.

[0029] The left binding warp thread 3Bl passes above the upper surface side wefts (5'U, 7'U, 9'U, 11'U, 13'U, 15'U) to form six upper surface side knuckles, and passes below the lower surface side wefts (1'L, 20'L) to form two lower surface side knuckles. The right binding warp thread 3Br passes above the upper surface side wefts (1'U, 3'U, 17'U, 19'U, 21'U, 23'U) to form six upper surface side knuckles, and passes below the lower surface side wefts (8'L, 13'L) to form two lower surface side knuckles.

[0030] FIG. 3(b) shows a configuration in which lower side warp 4L is woven into lower side wefts (1'L, 2'L, 4'L, 5'L, 7'L, 8'L, 10'L, 11'L, 13'L, 14'L, 16'L, 17'L, 19'L, 20'L, 22'L, 23'L). Lower side warp 4L passes under lower side wefts (1'L, 5'L, 13'L, 17'L) to form four lower side knuckles. Lower side warps (4L, 6L, 8L, 10L, 12L, 14L, 16L) include those whose weaving positions are shifted vertically from lower side warp 2L, but form a 1 / 2-1 / 4 weaving pattern in the lower side layer, which is the same weaving pattern as lower side warp 2L.

[0031] The left binding warp threads (3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl) include those whose weaving positions are shifted in the warp direction from the left binding warp thread 1Bl, but have a common weaving pattern with the left binding warp thread 1Bl, and form six consecutive upper surface side knuckles and two consecutive lower surface side knuckles.

[0032] The right binding warp yarns (3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br) include those whose weaving positions are shifted in the warp direction from the right binding warp yarn 1Br, but have a common weaving pattern with the right binding warp yarn 1Br, and are woven in a weaving pattern that forms six upper surface side knuckles in succession and two lower surface side knuckles in succession. In this way, the left binding warp yarn and the right binding warp yarn form a common weaving pattern that forms six upper surface side knuckles and two lower surface side knuckles. By weaving the left binding warp yarn and the right binding warp yarn in a common weaving pattern with respect to the weft yarn, all the binding warp yarns are formed in a common weaving pattern. Therefore, industrial multilayer fabrics can be manufactured in two types of weaving patterns, the weaving pattern of the binding warp yarns and the weaving pattern of the lower surface side warp yarns, making manufacturing easier.

[0033] The warp pair consisting of the left binding warp thread 1Bl and the right binding warp thread 1Br forms six upper side knuckles each, forming a weaving pattern in which the upper side wefts (1'U to 24'U) are woven alternately up and down on the surface of the upper side layer. The warp pair consisting of the left binding warp threads (3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl) and the right binding warp threads (3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br) also forms a weaving pattern in which the upper side wefts (1'U to 24'U) are woven alternately up and down on the surface of the upper side layer. In this way, the warp pairs form knuckles at regular intervals with respect to the upper side wefts, forming a common plain weave weaving pattern on the upper side layer, and are woven without destroying the surface structure. Furthermore, by making the surface of the upper layer into a plain weave, good smoothness and support for the paper fibers can be obtained, thereby reducing the number of places where the paper fibers can get stuck.

[0034] A warp pair consisting of left binding warp thread 1Bl and right binding warp thread 1Br each forms two lower side knuckles, thereby forming a weaving pattern in which it passes under one lower side weft (4'L, 16'L), over four consecutive lower side wefts (5'L, 7'L, 8'L, 10'L, 17'L, 19'L, 20'L, 22'L), under one lower side weft (11'L, 23'L), and over two consecutive lower side wefts (13'L, 14'L, 1'L, 2'L), forming a so-called 1 / 2-1 / 4 weaving pattern. Similarly, the warp pair consisting of the left binding warp yarns (3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl) and the right binding warp yarns (3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br) also forms a 1 / 2-1 / 4 weave pattern. In this way, the warp pairs form knuckles at regular intervals with respect to the lower side wefts, forming a common 1 / 2-1 / 4 weave pattern in the lower side layer.

[0035] As shown in FIG. 2(b) and FIG. 3(b), the lower side warp also forms a common weaving pattern of 1 / 2-1 / 4 weave. The warp pair and the lower side warp form the same weaving pattern, so they are woven without destroying the surface weave of the lower side layer. By weaving one lower side weft with two warps located on the lower side, the interval between the lower side knuckles formed in the lower side weft can be made larger. Therefore, the ratio of the lower side weft exposed to the lower side can be increased, and the lower side weft, which has excellent abrasion resistance, mainly bears the abrasion with the machine, thereby improving the abrasion resistance of the industrial multilayer fabric. In addition, in the industrial multilayer fabric of the first embodiment, the lower side knuckles are arranged in a dispersed manner rather than in a line, so that the occurrence of marks is suppressed more than when the lower side knuckles are arranged diagonally. In addition, with a ribbed weave, areas that are easy to dehydrate and areas that are difficult to dehydrate are arranged together, but in the lower layer of the industrial multilayer fabric of the first embodiment, the areas that are easy to dehydrate and areas that are difficult to dehydrate can be dispersed.

[0036] As shown in FIG. 2(a), the pair of left binding warp thread 1Bl and right binding warp thread 1Br are woven into the upper surface side wefts to function as upper surface side warps constituting the upper surface side layer, and are woven into the lower surface side wefts to function as lower surface side warps constituting the lower surface side layer. The upper surface side warp thread refers to the warp thread exposed on the upper surface side, and the lower surface side warp thread refers to the warp thread exposed on the lower surface side. In the portion where the left binding warp thread 1Bl is exposed on the upper surface side layer, the right binding warp thread 1Br is not exposed on the upper surface side layer, and in the portion where the right binding warp thread 1Br is exposed on the upper surface side layer, the left binding warp thread 1Bl is not exposed on the upper surface side layer. As a result, the left binding warp thread 1Bl and the right binding warp thread 1Br complement each other in the upper surface side layer to form a plain weave weaving pattern. The left binding warp thread 1Bl and the right binding warp thread 1Br are in a complementary relationship in the lower side layer as in the upper side layer, and form a weaving pattern similar to that of the lower side warp thread. Other pairs of left binding warp threads and right binding warp threads also complement each other in the same way, and form weaving patterns in the upper side layer and the lower side layer, respectively.

[0037] The left binding warp thread 3Bl forms a lower side knuckle N2 with respect to the lower side weft thread 20'L with which the adjacent lower side warp thread 2L on the left side forms one lower side knuckle N1, and forms a lower side knuckle N4 with respect to the lower side weft thread 1'L with which the adjacent lower side warp thread 4L on the right side forms one lower side knuckle N3. In other words, the left binding warp thread 3Bl forms a lower side knuckle (N2, N4) in the weft direction alongside the lower side knuckles (N1, N3) formed by the adjacent lower side warps (2L, 4L) on the left and right. Note that the left binding warp thread 3Bl and the right binding warp thread 3Br are positioned almost overlapping each other except at the intersection, so the lower side knuckle N4 of the left binding warp thread 3Bl is adjacent to the lower side knuckle N3 of the lower side weft thread 4L.

[0038] The right binding warp thread 3Br forms a lower side knuckle N6 with respect to the lower side weft thread 8'L with which the adjacent lower side warp thread 2L on the left forms one lower side knuckle N5, and forms a lower side knuckle N8 with respect to the lower side weft thread 13'L with which the adjacent lower side warp thread 4L on the right forms one lower side knuckle N7. In other words, the right binding warp thread 3Br forms lower side knuckles (N6, N8) alongside the lower side knuckles (N5, N7) formed by the adjacent lower side warps (2L, 4L) on the left and right.

[0039] The other left binding warp thread also forms a lower side knuckle in the weft direction aligned with one lower side knuckle formed by each of the lower side warps adjacent to the left and right. The other right binding warp thread also forms a lower side knuckle in the weft direction aligned with one lower side knuckle formed by each of the lower side warps adjacent to the left and right. That is, the left binding warp thread forms a lower side knuckle adjacent in the weft direction to one lower side knuckle formed by the lower side warp adjacent to the left side passing under the lower side weft, and forms a lower side knuckle adjacent in the weft direction to one lower side knuckle formed by the lower side warp adjacent to the right side passing under the lower side weft. In addition, the right binding warp thread forms a lower side knuckle adjacent in the weft direction to a lower side knuckle formed by the adjacent lower side warp thread on the left side passing under the lower side weft thread, and forms a lower side knuckle adjacent in the weft direction to a lower side knuckle formed by the adjacent lower side warp thread on the right side passing under the lower side weft thread.

[0040] The lower side warp thread forms a lower side knuckle arranged next to the lower side knuckles separately formed by the left binding warp thread adjacent to the left side, the right binding warp thread adjacent to the left side, the left binding warp thread adjacent to the right side, and the right binding warp thread adjacent to the right side.

[0041] In this way, since both the lower side knuckles formed by the left binding warp thread and the right binding warp thread are arranged next to either the lower side knuckles formed by the adjacent lower side warp threads on the left or right, they are pulled upward, making the left binding warp thread and the right binding warp thread less susceptible to wear.

[0042] In addition, compared to when the lower side knuckles formed by the left and right binding warp yarns are arranged side by side with the lower side knuckles of only one of the adjacent lower side warps, the pair of the left and right binding warp yarns is arranged side by side with the lower side knuckles formed by the lower side warps on both the left and right sides, which prevents the pair of the left and right binding warp yarns from shifting left and right, and the pair of the left and right binding warp yarns overlap each other, ensuring the dewatering properties of the industrial multilayer fabric. In addition, the lower side knuckles formed by the left and right binding warp yarns are arranged side by side with the lower side knuckles formed by the left and right lower side warps, which distributes them left and right, thereby preventing the occurrence of marks during papermaking. In addition, the weaving patterns of the adjacent left binding warp yarns among the left binding warp yarns (1Bl, 3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl) are significantly shifted vertically, which prevents the occurrence of marks. In addition, since the weaving patterns of adjacent right binding warp yarns among the right binding warp yarns (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br) are significantly shifted in the vertical direction, the occurrence of marks can be suppressed.

[0043] (Second Example) Fig. 4 is a design diagram showing the complete design of an industrial multilayer woven fabric according to Example 2. The industrial multilayer woven fabric shown in Fig. 4 is different from the industrial multilayer woven fabric shown in Fig. 1 in that the weaving patterns of the left binding warp thread and the right binding warp thread are shifted in the vertical direction.

[0044] The multilayer industrial fabric according to the second embodiment shown in Fig. 4 is constructed by weaving warps and wefts to form an upper side layer and a lower side layer. This multilayer industrial fabric is constructed of an upper side layer including left-side binding warps (1Bl, 3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl), right-side binding warps (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br), and upper side wefts (1'U to 24'U); and a lower side layer including lower side warps (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br), lower side warps (2L, 4L, 6L, 8L, 10L, 12L, 14L, 16L), and lower side wefts (1'L, 2'L, 4'L, 5'L, 7'L, 8'L, 10'L, 11'L, 13'L, 14'L, 16'L, 17'L, 19'L, 20'L, 22'L, 23'L).

[0045] The warp threads have a left binding warp thread woven into both the upper surface side weft and the lower surface side weft, a right binding warp thread woven into both the upper surface side weft and the lower surface side weft, and a lower surface side warp thread woven into only the lower surface side weft. The warp threads do not have an upper surface side warp thread woven into only the upper surface side weft. In the complete weave, there are eight left binding warp threads and eight right binding warp threads. The left binding warp threads and the right binding warp threads are adjacent to each other vertically to form eight pairs.

[0046] The lower side warp threads, which number eight in the complete design, are arranged adjacent to pairs of left and right binding warp threads and alternate with pairs of left and right binding warp threads.

[0047] The wefts have upper surface side wefts constituting a part of the upper surface side layer and lower surface side wefts constituting a part of the lower surface side layer. In the complete design, the upper surface side wefts have 24 threads and the lower surface side wefts have 16 threads, and the ratio of the upper surface side wefts to the lower surface side wefts is 3:2.

[0048] Next, the weaving method of each warp and each weft in the industrial multilayer fabric of the second embodiment will be described with reference to Figures 5(a), 5(b), 6(a) and 6(b). The arrangement of the upper surface side wefts and the lower surface side wefts shown in Figures 5(a), 5(b), 6(a) and 6(b) is the same.

[0049] Fig. 5(a) shows a form in which the left binding warp thread 1Bl and the right binding warp thread 1Br are woven into the upper surface side weft and the lower surface side weft. The left binding warp thread 1Bl passes above the upper surface side wefts (2'U, 4'U, 6'U, 20'U, 22'U, 24'U) to form six upper surface side knuckles, and passes below the lower surface side wefts (11'L, 16'L) to form two lower surface side knuckles.

[0050] The right binding warp yarn 1Br passes above the upper surface side wefts (8'U, 10'U, 12'U, 14'U, 16'U, 18'U) to form six upper surface side knuckles, and passes below the lower surface side wefts (4'L, 23'L) to form two lower surface side knuckles.

[0051] Fig. 5(b) shows a configuration in which lower side warp 2L is woven into lower side weft. Lower side warp 2L passes under one lower side weft (4'L, 16'L), over two consecutive lower side wefts (5'L, 7'L, 17'L, 19'L), under one lower side weft (8'L, 20'L), and over four consecutive lower side wefts (10'L, 11'L, 13'L, 14'L, 22'L, 23'L, 1'L, 2'L), forming a weaving pattern in the lower side layer with a so-called 1 / 2-1 / 4 weave.

[0052] Fig. 6(a) shows a form in which the left binding warp thread 3Bl and the right binding warp thread 3Br are woven into the upper surface side weft and the lower surface side weft. The left binding warp thread 3Bl passes above the upper surface side wefts (1'U, 3'U, 17'U, 19'U, 21'U, 23'U) to form six consecutive upper surface side knuckles, and passes below the lower surface side wefts (8'L, 13'L) to form two consecutive lower surface side knuckles. The right binding warp thread 3Br passes above the upper surface side wefts (5'U, 7'U, 9'U, 11'U, 13'U, 15'U) to form six upper surface side knuckles, and passes below the lower surface side wefts (1'L, 20'L) to form two lower surface side knuckles. The left and right binding warp yarns form a common weave pattern that forms six upper knuckles and two lower knuckles.

[0053] Fig. 6(b) shows a configuration in which lower side warp 4L is woven into lower side weft. Lower side warp 4L passes under lower side wefts (1'L, 5'L, 13'L, 17'L) to form four lower side knuckles. Lower side warps (4L, 6L, 8L, 10L, 12L, 14L, 16L) include those whose weaving positions are shifted vertically from lower side warp 2L, but form a 1 / 2-1 / 4 weaving pattern in the lower side layer, which is the same weaving pattern as lower side warp 2L.

[0054] The warp pair consisting of the left and right binding warps each form six upper side knuckles, forming a weaving pattern in which the upper side wefts are woven alternately up and down on the surface of the upper side layer. The warp pair consisting of the left and right binding warps forms a weaving pattern of 1 / 2-1 / 4 weaving common to the lower side warps.

[0055] The left binding warp forms a lower side knuckle adjacent in the weft direction to a lower side knuckle formed by the adjacent lower side warp on the left side passing under the lower side weft, and forms a lower side knuckle adjacent in the weft direction to a lower side knuckle formed by the adjacent lower side warp on the right side passing under the lower side weft. The right binding warp forms a lower side knuckle adjacent in the weft direction to a lower side knuckle formed by the adjacent lower side warp on the left side passing under the lower side weft, and forms a lower side knuckle adjacent in the weft direction to a lower side knuckle formed by the adjacent lower side warp on the right side passing under the lower side weft.

[0056] The left binding warp thread 1Bl and the left binding warp thread 3Bl shown in FIG. 1 are shifted by nine upper surface side wefts. Other adjacent left binding warp threads are also shifted by nine upper surface side wefts. Also, adjacent right binding warp threads shown in FIG. 1 are also shifted by nine upper surface side wefts. In contrast, the left binding warp thread 1Bl and the left binding warp thread 3Bl shown in FIG. 4 are shifted by three upper surface side wefts, and other adjacent left binding warp threads are also shifted by three upper surface side wefts. Also, adjacent right binding warp threads shown in FIG. 4 are also shifted by three upper surface side wefts. Due to this difference, in the industrial multilayer fabric shown in FIG. 1, the left binding warp thread and the right binding warp thread can be positioned apart from each other at the intersections, and the occurrence of marks can be suppressed.

[0057] The industrial multilayer fabric shown in the first embodiment of FIG. 1 and the industrial multilayer fabric shown in the second embodiment of FIG. 4 have the same weaving pattern and weaving position of the lower side warp. The position of the knuckle of the lower side warp is the same as the lower side knuckle of the pair of left and right binding warp threads. In the industrial multilayer fabrics of the first and second embodiments, the shift amount between adjacent left binding warp threads is different, but the knuckle positions of the pair of left and right binding warp threads are the same. This is because the arrangement of the left and right binding warp threads that make up the pair is partially reversed in the first and second embodiments. On the other hand, the weaving pattern is the same when the left and right binding warp threads are viewed as a pair in the first and second embodiments.

[0058] (Third Example) Fig. 7 is a design diagram showing a complete structure of an industrial multilayer woven fabric according to the third embodiment. The industrial multilayer woven fabric according to the third embodiment shown in Fig. 7 is constructed by weaving warp and weft yarns into an upper surface side layer and a lower surface side layer. This industrial multilayer woven fabric has an upper surface side layer including left binding warp yarns (1Bl, 3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl), right binding warp yarns (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br), and upper surface side wefts (1'U to 32'U), and a lower surface side layer including left binding warp yarns (1Bl, 3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl), right binding warp yarns (1Br, 3Br, 5Br, 7Br, 9Br, 11Bl, 13Bl, 15Br), and upper surface side wefts (1'U to 32'U). and a lower side layer including lower side warps (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br), lower side warps (2L, 4L, 6L, 8L, 10L, 12L, 14L, 16L), and lower side wefts (1'L, 3'L, 5'L, 7'L, 9'L, 11'L, 13'L, 15'L, 17'L, 19'L, 21'L, 23'L, 25'L, 27'L, 29'L, 31'L).

[0059] The warp yarns have left binding warps (1Bl, 3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl) woven into the upper surface side wefts and the lower surface side wefts, right binding warps (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br) woven into the upper surface side wefts and the lower surface side wefts, and lower surface side warps (2L, 4L, 6L, 8L, 10L, 12L, 14L, 16L) woven into only the lower surface side wefts. The warp yarns do not have upper surface side warps woven into only the upper surface side wefts. The left binding warp and right binding warp are woven into both the upper surface side wefts and the lower surface side wefts. In the complete weave, there are eight left binding warps and eight right binding warps. The left and right binding warp threads are vertically adjacent to each other to form eight pairs.

[0060] The lower side warps (2L, 4L, 6L, 8L, 10L, 12L, 14L, 16L) are eight in number in the complete design, and are arranged adjacent to pairs of left and right binding warps and alternately with pairs of left and right binding warps.

[0061] The wefts include upper surface side wefts (1'U to 32'U) which form a part of the upper side layer, and lower surface side wefts (1'L, 3'L, 5'L, 7'L, 9'L, 11'L, 13'L, 15'L, 17'L, 19'L, 21'L, 23'L, 25'L, 27'L, 29'L, 31'L) which form a part of the lower side layer. In the complete design, there are 32 upper surface side wefts and 16 lower surface side wefts, and the ratio of upper surface side wefts to lower surface side wefts is 2:1.

[0062] The pair of left and right binding warps and the lower surface side warp are arranged alternately in the weft direction. In the complete design, the upper surface side weft has a shaft number of 32. The industrial multi-layer fabrics of the first to third embodiments all have wefts with a shaft number of 24 or more. By setting the shaft number of the weft to a long number, the intersections of the left and right binding warps can be dispersed.

[0063] Next, the weaving method of each warp and each weft in the industrial multilayer fabric of the third embodiment will be described with reference to Figures 8(a), 8(b), 9(a) and 9(b). The arrangement of the upper surface side wefts and the lower surface side wefts shown in Figures 8(a), 8(b), 9(a) and 9(b) is the same.

[0064] Figure 8(a) shows a form in which the left binding warp thread 1Bl and the right binding warp thread 1Br are woven into the upper surface side wefts (1'U to 32'U) and the lower surface side wefts (1'L, 3'L, 5'L, 7'L, 9'L, 11'L, 13'L, 15'L, 17'L, 19'L, 21'L, 23'L, 25'L, 27'L, 29'L, 31'L). As shown in Figure 8(a), the left binding warp thread 1Bl and the right binding warp thread 1Br are adjacent to each other vertically to form a pair and cross each other for binding.

[0065] The left binding warp yarn 1Bl passes above the upper surface side wefts (3'U, 5'U, 7'U, 9'U, 11'U, 13'U, 15'U, 17'U) to form eight upper surface side knuckles, and passes below the lower surface side wefts (23'L, 29'L) to form two lower surface side knuckles.

[0066] The right binding warp yarn 1Br forms eight upper side knuckles in the upper side wefts (1'U, 19'U, 21'U, 23'U, 25'U, 27'U, 29'U, 31'U) and two lower side knuckles in the lower side wefts (7'L, 13'L).

[0067] 8(b) shows a configuration in which lower side warp 2L is woven into lower side wefts. Lower side warp 2L passes under lower side wefts (3'L, 13'L, 19'L, 29'L) to form four lower side knuckles.

[0068] Lower side warp 2L passes under one lower side weft (13'L, 29'L), over two consecutive lower side wefts ("15'L, 17'L", "31'L, 1'L"), under one lower side weft (19'L, 3'L), and over four consecutive lower side wefts ("21'L, 23'L, 25'L, 27'L", "5'L, 7'L, 9'L, 11'L"), forming a weave pattern in the lower side layer, a so-called 1 / 2-1 / 4 weave pattern.

[0069] Fig. 9(a) shows a form in which the left binding warp thread 3Bl and the right binding warp thread 3Br are woven into the upper surface side wefts (1'U to 32'U) and the lower surface side wefts (1'L, 3'L, 5'L, 7'L, 9'L, 11'L, 13'L, 15'L, 17'L, 19'L, 21'L, 23'L, 25'L, 27'L, 29'L, 31'L). As shown in Fig. 9(a), the left binding warp thread 3Bl and the right binding warp thread 3Br are adjacent to each other vertically to form a pair and cross each other for binding.

[0070] The left binding warp thread 3Bl passes above the upper surface side wefts (16'U, 18'U, 20'U, 22'U, 24'U, 26'U, 28'U, 30'U) to form eight upper surface side knuckles, and passes below the lower surface side wefts (3'L, 9'L) to form two lower surface side knuckles. The right binding warp thread 3Br passes above the upper surface side wefts (2'U, 4'U, 6'U, 8'U, 10'U, 12'U, 14'U, 32'U) to form eight upper surface side knuckles, and passes below the lower surface side wefts (19'L, 25'L) to form two lower surface side knuckles.

[0071] FIG. 9(b) shows a configuration in which lower side warp 4L is woven into lower side wefts (1'L, 3'L, 5'L, 7'L, 9'L, 11'L, 13'L, 15'L, 17'L, 19'L, 21'L, 23'L, 25'L, 27'L, 29'L, 31'L). Lower side warp 4L passes under lower side wefts (9'L, 15'L, 25'L, 31'L) to form four lower side knuckles. Lower side warps (4L, 6L, 8L, 10L, 12L, 14L, 16L) form a 1 / 2-1 / 4 weave pattern in the lower side layer, similar to lower side warp 2L.

[0072] The left binding warp threads (3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl) include those whose weaving positions are shifted in the warp direction from the left binding warp thread 1Bl, but have a common weaving pattern with the left binding warp thread 1Bl, and form eight consecutive upper surface side knuckles and two consecutive lower surface side knuckles.

[0073] Although the right binding warp threads (3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br) include ones whose weaving positions are shifted in the warp direction from the right binding warp thread 1Br, they have a common weaving pattern with the right binding warp thread 1Br, and are woven in a weaving pattern that forms eight consecutive upper surface side knuckles and two consecutive lower surface side knuckles. In this way, the left binding warp thread and the right binding warp thread form a common weaving pattern. The left binding warp thread and the right binding warp thread are woven with the weft thread in a common weaving pattern, so that all the binding warp threads are formed in a common weaving pattern.

[0074] The warp pair consisting of the left binding warp thread 1Bl and the right binding warp thread 1Br each forms eight upper side knuckles, forming a weaving pattern on the surface of the upper side layer in which the upper side wefts (1'U to 32'U) are woven alternately up and down one by one. The warp pair consisting of the left binding warp thread (3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl) and the right binding warp thread (3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br) also forms a weaving pattern on the surface of the upper side layer in which the upper side wefts (1'U to 32'U) are woven alternately up and down one by one. In this way, the warp pairs form a common plain weave weaving pattern on the upper side layer, and are woven without destroying the surface structure.

[0075] A warp pair consisting of a left binding warp and a right binding warp each forms two lower side knuckles, forming a weaving pattern in which it passes under one lower side weft, over two consecutive lower side wefts, under one lower side weft, and over four consecutive lower side wefts, forming a common 1 / 2-1 / 4 weaving pattern. The warp pair and the lower side warp form the same weaving pattern, so they are woven together without destroying the surface weaving of the lower side layer.

[0076] The pair of left and right binding warp threads are woven into the upper surface side weft threads to function as warp threads located on the upper surface side constituting the upper surface side layer, and are woven into the lower surface side weft threads to function as warp threads located on the lower surface side constituting the lower surface side layer.

[0077] The left binding warp thread 3Bl forms a lower side knuckle N1 with respect to lower side weft thread 3'L with which lower side warp thread 2L adjacent on the left side forms one lower side knuckle N2, and forms a lower side knuckle N3 with respect to lower side weft thread 9'L with which lower side warp thread 4L adjacent on the right side forms one lower side knuckle N4. In other words, the left binding warp thread 3Bl forms lower side knuckles (N1, N3) aligned in the weft direction with the lower side knuckles (N2, N4) formed by the lower side warps (2L, 4L) adjacent on the left and right.

[0078] The right binding warp thread 3Br forms a lower side knuckle N5 with respect to the lower side weft thread 19'L with which the adjacent lower side warp thread 2L on the left forms one lower side knuckle N6, and forms a lower side knuckle N7 with respect to the lower side weft thread 25'L with which the adjacent lower side warp thread 4L on the right forms one lower side knuckle N8. In other words, the right binding warp thread 3Br forms a lower side knuckle (N5, N7) alongside the lower side knuckles (N6, N8) formed by the adjacent lower side warps (2L, 4L) on the left and right.

[0079] The other left binding warp thread also forms a lower side knuckle in the weft direction aligned with one lower side knuckle formed by each of the lower side warps adjacent to it on the left and right. Also, the other right binding warp thread also forms a lower side knuckle in the weft direction aligned with one lower side knuckle formed by each of the lower side warps adjacent to it on the left and right. This makes it possible to prevent the pair of left binding warp thread and right binding warp thread from shifting left and right, and the pair of left binding warp thread and right binding warp thread overlap each other, ensuring the dewatering properties of the industrial multilayer fabric.

[0080] (Fourth Example) Fig. 10 is a design diagram showing a complete structure of an industrial multilayer woven fabric according to the fourth embodiment. The industrial multilayer woven fabric according to the fourth embodiment shown in Fig. 10 is constructed by weaving warp and weft yarns into an upper surface side layer and a lower surface side layer. This industrial multilayer woven fabric has an upper surface side layer including left binding warp yarns (1Bl, 3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl), right binding warp yarns (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br), and upper surface side wefts (1'U to 32'U); and a lower side layer including lower side warps (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br), lower side warps (2L, 4L, 6L, 8L, 10L, 12L, 14L, 16L), and lower side wefts (1'L, 3'L, 5'L, 7'L, 9'L, 11'L, 13'L, 15'L, 17'L, 19'L, 21'L, 23'L, 25'L, 27'L, 29'L, 31'L).

[0081] The warp yarns have left binding warps (1Bl, 3Bl, 5Bl, 7Bl, 9Bl, 11Bl, 13Bl, 15Bl) woven into the upper surface side wefts and the lower surface side wefts, right binding warps (1Br, 3Br, 5Br, 7Br, 9Br, 11Br, 13Br, 15Br) woven into the upper surface side wefts and the lower surface side wefts, and lower surface side warps (2L, 4L, 6L, 8L, 10L, 12L, 14L, 16L) woven into only the lower surface side wefts. The warp yarns do not have upper surface side warps woven into only the upper surface side wefts. The left binding warp and right binding warp are woven into both the upper surface side wefts and the lower surface side wefts. In the complete weave, there are eight left binding warps and eight right binding warps. The left and right binding warp threads are vertically adjacent to each other to form eight pairs.

[0082] The lower side warps (2L, 4L, 6L, 8L, 10L, 12L, 14L, 16L) are eight in number in the complete design, and are arranged adjacent to pairs of left and right binding warps and alternately with pairs of left and right binding warps.

[0083] The wefts include upper surface side wefts (1'U to 32'U) constituting a part of the upper surface side layer, and lower surface side wefts (1'L, 3'L, 5'L, 7'L, 9'L, 11'L, 13'L, 15'L, 17'L, 19'L, 21'L, 23'L, 25'L, 27'L, 29'L, 31'L) constituting a part of the lower surface side layer. In the complete design, there are 32 upper surface side wefts and 16 lower surface side wefts, and the ratio of upper surface side wefts to lower surface side wefts is 2:1. The pair of left and right binding warps and the lower surface side warp are alternately arranged in the weft direction. In the complete design, the upper surface side weft is a 32 shaft.

[0084] Next, the weaving method of each warp and each weft in the industrial multilayer fabric of Example 4 will be described with reference to Figures 11(a), 11(b), 12(a) and 12(b). The arrangement of the upper surface side weft and the lower surface side weft shown in Figures 11(a), 11(b), 12(a) and 12(b) is the same.

[0085] Figure 11(a) shows a form in which left binding warp thread 1Bl and right binding warp thread 1Br are woven into upper surface side wefts (1'U to 32'U) and lower surface side wefts (1'L, 3'L, 5'L, 7'L, 9'L, 11'L, 13'L, 15'L, 17'L, 19'L, 21'L, 23'L, 25'L, 27'L, 29'L, 31'L).

[0086] The left binding warp yarn 1Bl forms eight upper side knuckles in the upper side wefts (1'U, 19'U, 21'U, 23'U, 25'U, 27'U, 29'U, 31'U) and two lower side knuckles in the lower side wefts (7'L, 13'L).

[0087] The right binding warp yarn 1Br passes above the upper surface side wefts (3'U, 5'U, 7'U, 9'U, 11'U, 13'U, 15'U, 17'U) to form eight upper surface side knuckles, and passes below the lower surface side wefts (23'L, 29'L) to form two lower surface side knuckles.

[0088] Fig. 11(b) shows a configuration in which lower side warp 2L is woven into lower side weft. Lower side warp 2L passes under one lower side weft (13'L, 29'L), over two consecutive lower side wefts (15'L, 17'L, 31'L, 1'L), under one lower side weft (19'L, 3'L), and over four consecutive lower side wefts (21'L, 23'L, 25'L, 27'L, 5'L, 7'L, 9'L, 11'L), forming a weaving pattern in the lower side layer.

[0089] Figure 12(a) shows a form in which left binding warp thread 3Bl and right binding warp thread 3Br are woven into upper surface side wefts (1'U to 32'U) and lower surface side wefts (1'L, 3'L, 5'L, 7'L, 9'L, 11'L, 13'L, 15'L, 17'L, 19'L, 21'L, 23'L, 25'L, 27'L, 29'L, 31'L).

[0090] The left binding warp thread 3Bl passes above the upper surface side wefts (16'U, 18'U, 20'U, 22'U, 24'U, 26'U, 28'U, 30'U) to form eight upper surface side knuckles, and passes below the lower surface side wefts (3'L, 9'L) to form two lower surface side knuckles. The right binding warp thread 3Br passes above the upper surface side wefts (2'U, 4'U, 6'U, 8'U, 10'U, 12'U, 14'U, 32'U) to form eight upper surface side knuckles, and passes below the lower surface side wefts (19'L, 25'L) to form two lower surface side knuckles.

[0091] FIG. 12(b) shows a configuration in which lower side warp 4L is woven into lower side wefts (1'L, 3'L, 5'L, 7'L, 9'L, 11'L, 13'L, 15'L, 17'L, 19'L, 21'L, 23'L, 25'L, 27'L, 29'L, 31'L). Lower side warp 4L passes under lower side wefts (9'L, 15'L, 25'L, 31'L) to form four lower side knuckles. Lower side warps (4L, 6L, 8L, 10L, 12L, 14L, 16L) form a 1 / 2-1 / 4 weave pattern in the lower side layer, similar to lower side warp 2L.

[0092] The left binding warp thread is aligned in the weft direction with one lower side knuckle formed by each of the lower side warps adjacent to it on the left and right, forming a lower side knuckle, and the right binding warp thread is also aligned in the weft direction with one lower side knuckle formed by each of the lower side warps adjacent to it on the left and right, forming a lower side knuckle.

[0093] The industrial multi-layer fabric according to each of the above-mentioned embodiments may be subjected to the following processing. For example, in order to improve the smoothness of the surface, the surface side of the industrial multi-layer fabric may be polished to a depth of 0.02 to 0.05 mm. It is particularly preferable that the surface side is polished to a depth of 0.02 mm or 0.03 mm.

[0094] In addition, in order to prevent fraying of the threads at the end of the net (industrial multilayer fabric), the area of ​​5 mm to 30 mm from the end of the net (particularly the area of ​​5 mm, 10 mm, and 20 mm) may be coated with polyurethane resin to reinforce the net. The end of the net may be coated on one or both sides. The resin may be hot-melt polyurethane.

[0095] In order to improve the abrasion resistance of the net end, the area 20mm to 500mm away from the net end (particularly the area 25, 50, 75, 100, 150, 250, 300, 350, 400mm away) may be coated with 3 to 16 (particularly 3, 4, 7, 8, 10, 12, 15, 16) strips of resin about 7mm wide over the entire length. The aforementioned multiple polyurethane resin strips may be applied to both ends of the net, or only on one side. The resin may be hot-melt polyurethane.

[0096] In addition, in order to improve the stain resistance, the entire net may be coated with a resin. In addition, in order to enable trimming of the papermaking width near the net end, a range 10 mm to 500 mm away from the net end (particularly 10, 15, 20, 25, 30, 40, 50, 75, 100, 150, 200, 250, 300, 350, 400 mm) may be coated with a strip-shaped resin having a width of about 3, 5, 7, 10, 15, or 20 mm over the entire length. The resin may be applied to both ends of the net, or only to one side. The resin may be polyurethane or hot melt. In addition, a line of about 25 mm or 50 mm in width may be drawn on the net over the entire width so that the streaks of the net can be seen during use.

[0097] The range of preferred elements of the industrial multilayer fabric is as follows. The diameter of the warp 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 warp may be the same as that of the binding warp, or may be set to 1.1 to 1.3 times the diameter of the binding warp. The diameter of the weft 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 that of the upper surface side weft, and may be 1.1 to 3.0 times the diameter of the upper surface side weft, and more preferably 1.2 to 2.0 times the diameter of the upper surface side weft.

[0098] The upper surface side weft may be made of only PET wire, only polyamide wire, or PET and polyamide wires woven alternately. The lower surface side weft may be made of only PET wire, only polyamide wire, or PET and polyamide wires woven alternately. In order to reduce the driving load of the machine, a low friction yarn may be woven into the lower surface side weft.

[0099] The air permeability is preferably from 100 cm3 / cm2 / s to 600 cm3 / cm2 / s, and more preferably from 120 cm3 / cm2 / s to 300 cm3 / cm2 / s.

[0100] 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 applications of the belt are as a papermaking or nonwoven fabric belt, and in particular as a papermaking dewatering belt or a spunbond nonwoven fabric transport belt.

[0101] The cross-sectional shape of the warp and weft yarns in each of the above-mentioned embodiments is not limited to a circle, and it is possible to use yarns having a square or star shape, an elliptical shape, a hollow shape, a core-sheath structure, etc. In particular, by making the cross-sectional shape of the lower warp yarn a square, rectangular or elliptical shape, the cross-sectional area of ​​the yarn can be increased, and the elongation resistance and rigidity can be improved.

[0102] The material of the yarn can be freely selected within a range that satisfies the desired characteristics, and polyethylene terephthalate, polyester, polyamide, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, aramid, polyether ether ketone, polyethylene naphthalate, polytetrafluoroethylene, cotton, wool, metal, thermoplastic polyurethane, thermoplastic elastomer, etc. can be used. Of course, it is also possible to use yarns made of copolymers or these materials blended with or containing various substances depending on the purpose. In general, it is preferable to use polyester monofilament, which has rigidity and excellent dimensional stability, as the yarn constituting the industrial multilayer fabric. [Explanation of symbols]

[0103] 1Bl left binding warp, 1Br right binding warp, 1'U upper side weft, 1'L lower side weft, 2L lower side warp.

Claims

1. An industrial multi-layer fabric comprising an upper layer and a lower layer formed by weaving warp and weft yarns, The weft yarn is an upper surface side weft constituting a part of the upper surface side layer; a lower surface side weft constituting a part of the lower surface side layer, The warp yarns are a first binding warp yarn woven with the upper surface side weft and the lower surface side weft; a second binding warp yarn which is woven with the upper surface side weft and the lower surface side weft and which is paired with the first binding warp yarn vertically; a lower surface side warp yarn that is woven into the lower surface side weft and is disposed adjacent to the pair of the first binding warp yarn and the second binding warp yarn, the first binding warp yarn and the second binding warp yarn forming a pair are woven into the upper surface side weft to function as warps located on the upper surface side constituting the upper surface side layer, and are woven into the lower surface side weft to function as warps located on the lower surface side constituting the lower surface side layer, the pair of first and second binding warps and the lower side warp are alternately arranged; the first binding warp forms a knuckle with respect to the lower side weft that forms one knuckle with the lower side warp adjacent to the left side, and forms a knuckle with respect to the lower side weft that forms one knuckle with the lower side warp adjacent to the right side, The second binding warp yarn forms a knuckle with respect to the lower side weft yarn with which the lower side warp yarn adjacent to the left side forms a single knuckle, and forms a knuckle with respect to the lower side weft yarn with which the lower side warp yarn adjacent to the right side forms a single knuckle.

2. 2. The industrial multi-layer fabric according to claim 1, wherein the warp yarns do not have upper surface side warps woven into only the upper surface side wefts.

3. 3. The industrial multi-layer fabric according to claim 1, wherein the first binding warp yarn and the second binding warp yarn are woven with the weft yarn in a common weaving pattern.

4. The industrial multilayer fabric according to claim 1 or 2, characterized in that the lower surface side warp thread forms a weaving pattern in which it passes under one of the lower surface side weft threads, over two consecutive lower surface side weft threads, under one of the lower surface side weft threads, and over four consecutive lower surface side weft threads.

5. 3. The industrial multi-layer fabric according to claim 1, wherein the weft yarn has 24 shafts or more in the complete weave.

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