Industrial fabric

Abstract

An industrial fabric (100) in which an upper-side fabric comprising upper-side warp yarns and upper-side weft yarns and a lower-side fabric comprising lower-side warp yarns and lower-side weft yarns are bonded, the upper-side warp yarns (1Ub) functioning as upper-side bonding yarns for bonding the upper-side fabric and the lower-side fabric, and the lower-side warp yarns (1Ub) functioning as lower-side bonding yarns for bonding the lower-side fabric and the upper-side warp yarns (1Ub) functioning as lower-side bonding yarns for bonding the lower-side fabric and the upper-side warp yarns (1Ub). The lower-side warp yarns (2Lb) function as lower-side binding yarns that bind the upper-side fabric and the lower-side fabric. The number of yarn knots formed by the upper-side warp yarns (1Ub) in the upper-side fabric is greater than the number of yarn knots formed by the lower-side warp yarns (2Lb) in the upper-side fabric, and the number of the lower-side warp yarns is twice the number of the upper-side warp yarns.

Description

[0001] This application is a divisional application of the invention patent application filed with the State Intellectual Property Office on September 21, 2022, with application number 202180023124.X (international application number PCT / JP2021 / 015441, international application date April 14, 2021) entitled "Industrial Fabrics". Technical Field

[0002] This invention relates to industrial fabrics for use in papermaking machines. Background Technology

[0003] For a long time, papermaking webs woven with warp and weft yarns have been widely used as industrial fabrics for papermaking machines. There are many desired properties for papermaking webs. For example, as an industrial fabric considering surface smoothness, an industrial fabric (see Patent Document 1) has been proposed, which consists of an upper side fabric composed of upper side warp and upper side weft yarns and a lower side fabric composed of lower side warp and lower side weft yarns. The upper side fabric is formed by an upper side warp yarn structure composed of two warp yarns in a group. These two warp yarns are warp yarn bonding yarns that function to connect the upper side fabric and the lower side fabric. The warp yarn bonding yarns are woven into the lower side weft yarns at the same position as the lower side warp yarns are woven into the lower side weft yarns.

[0004] (Existing technical literature)

[0005] (Patent Documents)

[0006] Patent Document 1: U.S. Patent Application Publication No. 2006 / 0048840. Summary of the Invention

[0007] (The problem the invention aims to solve)

[0008] It is necessary to weave in more of the upper side weft yarns to improve the support of the paper raw materials, enhance the paper's texture, and improve its retention.

[0009] The present invention has been made in view of this situation, and one of its exemplary purposes is to provide an industrial fabric that improves the support, strengthens the texture and retention of paper raw materials.

[0010] (The measures taken to solve the problem)

[0011] To address the aforementioned problems, an industrial fabric according to a certain aspect of the present invention comprises an upper fabric consisting of upper warp and upper weft yarns and a lower fabric consisting of lower warp and lower weft yarns. The upper warp yarns have a first warp yarn that functions as an upper binding thread connecting the upper and lower fabrics, and the lower warp yarns have a second warp yarn that functions as a lower binding thread connecting the upper and lower fabrics. The upper binding thread forms more yarn knots in the upper fabric than the lower binding thread forms in the upper fabric, and the number of lower warp yarns is twice the number of upper warp yarns.

[0012] According to this method, the number of warp yarns on the bottom side is twice that on the top side, thus reducing the density of the warp yarns on the top side. Compared to the usual ratio of top to bottom warp yarns (1:1), more weft yarns on the top side can be woven in. This results in improved support for the paper raw material, enhancing the paper's texture and retention. Furthermore, the number of yarn knots formed by the top-side knotting yarns in the top fabric differs from that formed by the bottom-side knotting yarns, reducing the regularity of the intersection of the two knotting yarns. Consequently, the formation of warp marks is suppressed.

[0013] The top and bottom side knots can also be adjacent.

[0014] The upper side fabric is woven from upper side-jointing yarns, lower side-jointing yarns, and upper side weft yarns, with the upper and lower side-jointing yarns complementing the surface structure of the upper side fabric. Thus, the two warp yarns have a complementary structure, preventing the structure from collapsing even at the joints, thereby improving surface texture. Furthermore, the upper and lower side-jointing yarns can also complement the surface structure of the lower side fabric.

[0015] Other embodiments of the present invention also include industrial fabrics. These industrial fabrics are industrial fabrics comprising an upper fabric composed of upper-side warp and upper-side weft yarns and a lower fabric composed of lower-side warp and lower-side weft yarns, wherein the first warp yarn of the upper-side warp yarns functions as an upper-side collapsed yarn (deformed yarn) that collapses (deforms) a portion of the surface structure of the upper-side fabric while being woven into the upper-side weft yarns, and the second warp yarn of the lower-side warp yarns functions as a lower-side connecting yarn that connects the upper-side fabric and the lower-side fabric; the number of lower-side warp yarns is twice the number of upper-side warp yarns; the upper-side collapsed yarns and lower-side connecting yarns are adjacent; the upper-side fabric is woven from at least the upper-side collapsed yarns, the lower-side connecting yarns, and the upper-side weft yarns; and the upper-side collapsed yarns and lower-side connecting yarns complement the surface structure of the upper-side fabric.

[0016] According to this method, the number of warp yarns on the bottom side is twice that on the top side, thus reducing the density of the warp yarns on the top side. Compared to the usual ratio of warp yarns to top side (1:1), more weft yarns on the top side can be woven in. As a result, the support of the paper raw material is improved, and the paper's texture and retention are enhanced. Furthermore, by using bottom-side knotting yarns to join the top and bottom side fabrics, the number of crossing points is reduced compared to using both top-side and bottom-side knotting yarns, ensuring high air permeability. In addition, the top-side collapsing yarns and bottom-side knotting yarns complement the surface structure of the top side fabric, thus preventing the structure from collapsing even at the knotting points, thereby improving surface properties.

[0017] The top side-collapsed yarn can be 1 / 3 of the total number of warp yarns, and the bottom side-joined knot yarn can be 1 / 3 of the total number of warp yarns.

[0018] The total number of warp threads on the upper side can be 30 to 150 per inch.

[0019] The total number of weft yarns on the upper side can be 20 to 150 per inch.

[0020] The surface weave of the upper side fabric can be plain weave. This improves fiber support and surface smoothness.

[0021] In the lower side fabric, the lower side warp yarns can pass over 4 lower side weft yarns in sequence, pass under 1 lower side weft yarn, pass over 2 lower side weft yarns, and pass under 1 lower side weft yarn.

[0022] The lower side warp yarns do not have to be the joining yarns.

[0023] The lower side-joint yarn can have a first lower side-joint yarn and a second lower side-joint yarn adjacent to both sides of the lower side warp yarn, respectively. Regarding the lower side warp yarn, the portion that weaves the lower side weft yarn together with the adjacent first lower side-joint yarn and the portion that weaves the lower side weft yarn together with the adjacent second lower side-joint yarn can be configured in a zigzag shape. Therefore, unlike flat weave, it is less prone to leaving marks.

[0024] In a complete weave, the warp yarns can be 12 count and the weft yarns can be 24 count.

[0025] Furthermore, any combination of the above components, or any conversion between methods, apparatuses, systems, etc., that embody the present invention, are valid as embodiments of the present invention.

[0026] (The effect of the invention)

[0027] According to the present invention, the generation of traces can be suppressed. Attached Figure Description

[0028] Figure 1 This is a design drawing showing the complete structure of the multilayer fabric for papermaking according to the first embodiment.

[0029] Figure 2 For along Figure 1 The design drawing shown includes cross-sectional views of each warp yarn.

[0030] Figure 3 This is a design drawing illustrating the complete structure of the multilayer fabric for papermaking according to the second embodiment.

[0031] Figure 4 For along Figure 3 The design drawing shown includes cross-sectional views of each warp yarn.

[0032] Figure 5 This is a design drawing illustrating the complete structure of the multilayer fabric for papermaking according to the third embodiment.

[0033] Figure 6 For along Figure 5 The design drawing shown includes cross-sectional views of each warp yarn.

[0034] Figure 7 This is a design drawing illustrating the complete structure of the multilayer fabric for papermaking according to the fourth embodiment.

[0035] Figure 8 For along Figure 7 The design drawing shown includes cross-sectional views of each warp yarn. Detailed Implementation

[0036] The present invention will now be described based on embodiments and with reference to the accompanying drawings. Identical or equivalent components, parts, and processes shown in the drawings are given the same reference numerals, and repetitive descriptions are omitted where appropriate. Furthermore, the embodiments are exemplary and not intended to limit the invention; all features and combinations of features described in the embodiments are not necessarily essential to the invention. Additionally, the use of terms such as "first" and "second" in this specification or claims, unless otherwise stated, does not represent any order or importance, but is used to distinguish one structure from another.

[0037] Furthermore, in the following description, "warp yarn" refers to the thread extending along the conveying direction of the web when a multi-layered fabric for papermaking is made into a circular conveyor belt, and "weft yarn" refers to the thread extending along the direction intersecting with the warp yarn. Additionally, "top-side fabric" refers to the fabric on the surface side of the papermaking web where the web is conveyed, located on both sides of the papermaking web when a multi-layered fabric is used, and "bottom-side fabric" refers to the fabric on the back side, located on both sides of the papermaking conveyor belt, primarily in contact with the drive rollers. Furthermore, the term "surface" refers to the exposed side of the top-side fabric and the bottom-side fabric; the "surface" of the top-side fabric corresponds to the surface side of the papermaking web, and the "surface" of the bottom-side fabric corresponds to the back side of the papermaking web.

[0038] Furthermore, a "design drawing" is the smallest repeating unit of a fabric structure and is equivalent to a complete fabric structure. That is, a "complete fabric structure" is formed by repeating the same pattern front to back and side to side. In addition, a "knuckle" refers to the part of a warp yarn that protrudes towards the surface above or below one or more weft yarns.

[0039] In addition, "joining yarn" is at least a portion of the warp yarns that make up the upper side fabric (or the lower side fabric), and is a weft yarn that is originally only woven into the upper side fabric (or the lower side fabric) and is woven into the lower side fabric (or the upper side fabric) from the back side (or the front side) to join the upper side fabric and the lower side fabric.

[0040] [First Implementation Method]

[0041] Hereinafter, the structure of the multilayer fabric for papermaking according to the first embodiment will be described with reference to the accompanying drawings. Figure 1 This is a design drawing showing the complete structure of the multilayer fabric for papermaking according to the first embodiment. Figure 2 For along Figure 1 The design drawing shown includes cross-sectional views of each warp yarn.

[0042] In the design drawings, Arabic numerals, such as 1, 2, 3..., are used to represent warp yarns. Arabic numerals with apostrophes, such as 1', 2', 3'..., are used to represent weft yarns. Numbers with the letter U are used to represent top side yarns, and numbers with the letter L are used to represent bottom side yarns, such as 1'U, 2'L, etc. In addition, numbers with the letter b are used to represent the joining yarns that connect the top and bottom side fabrics.

[0043] In addition, in the design drawing, the ▲ mark indicates that the yarn that originally constitutes the lower side warp yarn is placed on the upper side weft yarn, the × mark indicates that the upper side warp yarn is placed on the upper side weft yarn, the △ mark indicates that the yarn that originally constitutes the upper side warp yarn is placed below the lower side weft yarn, and the ○ mark indicates that the lower side warp yarn is placed below the lower side weft yarn.

[0044] Figure 1 The industrial fabric 100 shown in the first embodiment is a fabric consisting of an upper side fabric composed of upper side warp yarns (1Ub, 4Ub, 7Ub, 10Ub) and upper side weft yarns (1'U to 16'U) and a lower side fabric composed of lower side warp yarns (2Lb, 3L, 5Lb, 6L, ..., 12L) and lower side weft yarns (1'L, 3'L, ..., 15'L).

[0045] Then, refer to Figure 2 This describes the weaving method of each warp and weft yarn in industrial fabric 100. The top warp yarn 1Ub functions as the top-side joining yarn that connects the top and bottom fabrics. The upper side warp yarn 1Ub is interwoven as follows: it passes over the upper side of the upper side weft yarn 1'U to form a surface side yarn node, then passes between the upper side weft yarns 2'U~4'U and the lower side weft yarn 3'L, passes under the lower side of the lower side weft yarn 5'L to form a back side yarn node, passes between the upper side weft yarns 6'U~8'U and the lower side weft yarn 7'L, passes over the upper side of the upper side weft yarn 9'U to form a surface side yarn node, then passes under the upper side of the upper side weft yarn 10U', then passes over the upper side of the upper side weft yarn 11'U to form a surface side yarn node, ..., then passes under the upper side of the upper side weft yarn 14'U, then passes over the upper side of the upper side weft yarn 15'U to form a surface side yarn node, and then passes under the upper side of the upper side weft yarn 16'U.

[0046] The lower warp yarn 2Lb is adjacent to the upper warp yarn 1Ub, serving as the lower side joining yarn to connect the upper and lower fabrics. The lower warp yarn 2Lb is interwoven as follows: it passes between the upper weft yarns 1'U~2'U and the lower weft yarn 1'L, passes over the upper side of the upper weft yarn 3'U to form a surface side yarn knot, then passes under the upper weft yarn 4'U, then passes over the upper side of the upper weft yarn 5'U to form a surface side yarn knot, then passes under the upper weft yarn 6'U, then passes over the upper side of the upper weft yarn 7'U to form a surface side yarn knot, passes between the upper weft yarns 8'U~10'U and the lower weft yarn 9'L, passes under the lower side of the lower weft yarn 11'L to form a back side yarn knot, and then passes between the upper weft yarns 12'U~16'U and the lower weft yarns 13L' and 15'L.

[0047] The lower side warp yarn 3L is interwoven as follows: it passes under the lower side weft yarn 1'L to form a back side yarn knot, then passes between the upper side weft yarns 2'U~10'U and the lower side weft yarns 3'L, 5'L, 7'L, 9'L, then passes under the lower side weft yarn 11'L to form a back side yarn knot, then passes between the upper side weft yarns 12'U~16'U and the lower side weft yarns 13'L, 15'L.

[0048] The upper warp yarn 4Ub, which functions as the upper side knot yarn, interweaves as follows: it passes under the lower weft yarn 1'L to form a back side yarn knot, then passes between the upper weft yarns 2'U~3'U and the lower weft yarn 3'L, passes over the upper side of the upper weft yarn 4'U to form a surface side yarn knot, then passes between the upper weft yarn 5'U and the lower weft yarn 5'L, passes over the upper side of the upper weft yarn 6'U to form a surface side yarn knot, ..., then passes between the upper weft yarn 11'U and the lower weft yarn 11'L, passes over the upper side of the upper weft yarn 12'U to form a surface side yarn knot, and then passes between the upper weft yarns 13'U~16'U and the lower weft yarns 13'L, 15'L.

[0049] The lower warp yarn 5Lb, which functions as the lower side knot yarn, interweaves as follows: it is adjacent to the upper warp yarn 4Ub, passes between the upper weft yarn 1'U and the lower weft yarn 1'L, and passes above the upper weft yarn 2'U to form a surface side yarn knot. Then it passes between the upper weft yarns 3'U to 6'U and the lower weft yarns 3'L and 5'L, and passes below the lower weft yarn 7'L to form a back side yarn knot. Then it passes between the upper weft yarns 8'U to 13'U and the lower weft yarns 9'L, 11'L, and 13'L, and passes above the upper weft yarn 14'U to form a surface side yarn knot. Then it passes between the upper weft yarn 15'U and the lower weft yarn 15'L, and passes above the upper weft yarn 16'U to form a surface side yarn knot.

[0050] The lower side warp yarn 6L is interwoven as follows: it passes between the upper side weft yarns 1'U~6'U and the lower side weft yarns 1'L, 3'L, and 5'L, and passes under the lower side weft yarn 7'L to form a back side yarn knot. Then it passes between the upper side weft yarns 8'U~12'U and the lower side weft yarns 9'L and 11'L, and passes under the lower side weft yarn 13'L to form a back side yarn knot. Then it passes between the upper side weft yarns 14'U~16'U and the lower side weft yarn 15'L.

[0051] In addition, Figure 1 , Figure 2 The top side warp yarns 7Ub, 10Ub and the bottom side warp yarns 8Lb, 9L, 11Lb and 12L shown are the same as the top side warp yarns 1Ub and 4Ub and the bottom side warp yarns 2Lb, 3L, 5Lb and 6L mentioned above, except that they are woven by offsetting 8 top side weft yarns in the conveying direction. The description of the weaving method is omitted.

[0052] As described above, the industrial fabric 100 of this embodiment is configured such that an upper-side fabric composed of upper-side warp yarns (1Ub, 4Ub, 7Ub, 10Ub) and upper-side weft yarns (1'U to 16'U) and a lower-side fabric composed of lower-side warp yarns (2Lb, 3L, 5Lb, 6L, ..., 12L) and lower-side weft yarns (1'L, 3'L, ..., 15'L) is joined together. Figure 1 The complete organization is shown.

[0053] Furthermore, in the industrial fabric 100, the top-side warp yarns (1Ub, 4Ub, 7Ub, 10Ub) and bottom-side warp yarns (2Lb, 3L, 5Lb, 6L, ..., 12L) total 12 counts, while the top-side weft yarns (1'U to 16'U) and bottom-side weft yarns (1'L, 3'L, ..., 15'L) total 24 counts. Therefore, compared to a complete weave with, for example, 48-count weft yarns, the industrial fabric 100 exhibits a more uniform force pulling the top-side weft yarns with the weft yarns attached downwards, resulting in better smoothness. Moreover, compared to a complete weave with 48-count weft yarns, the industrial fabric 100 has more up-and-down weft yarns and more weft points, thus strengthening the weft bond and suppressing internal wear.

[0054] Furthermore, in industrial fabric 100, the number of bottom warp yarns (8) is twice that of top warp yarns (4), thus reducing the density of the top warp yarns. Compared to the usual ratio of top to bottom warp yarns (1:1), the top weft yarns can be incorporated more frequently. As a result, the support of the paper raw material is improved, the paper texture is strengthened, and its retention is enhanced.

[0055] Furthermore, the space ratio (gap between warp yarns) of the upper warp yarns increases, while the space ratio of the lower warp yarns decreases. As a result, during raw material dewatering, the flow velocity on the surface side of the industrial fabric 100 decreases, while the flow velocity on the back side increases, thus resulting in slower dewatering and a stronger paper texture. Additionally, if a large amount of water remains inside the wire, a phenomenon known as splashing occurs due to the high-speed rotation of the paper machine, where water disperses like a mist. However, in the industrial fabric 100 of this embodiment, the surface tension of the water on the surface side is reduced, resulting in less water inside the wire, thus suppressing splashing.

[0056] In the industrial fabric 100 of this embodiment, the number of yarn knots (5) formed in the upper side fabric by the upper side warp yarns 1Ub (4Ub, 7Ub, 10Ub) which are upper side-joined yarns is different from the number of yarn knots (3) formed in the upper side fabric by the lower side warp yarns 2Lb (5Lb, 8Lb, 11Lb) which are lower side-joined yarns. Thus, in the industrial fabric 100, the upper side-joined yarns and the lower side-joined yarns have different weaves.

[0057] Generally, the intersection of two binding yarns exhibits the following trends: (i) decreased dehydration, and (ii) locally increased traction of the upper weft yarn. Therefore, if the intersection is regularly arranged, marks (weft yarn marks, regularly sloping marks) are easily formed. In particular, when the binding yarns are of the same weave, regularity occurs, making the aforementioned problems more likely. Therefore, as in the industrial fabric 100 of this embodiment, the two binding yarns are made of different weaves, thereby reducing the regularity of the intersection arrangement. As a result, the formation of marks is suppressed. Furthermore, smoothness and uniform dehydration are improved, and the paper's texture is strengthened.

[0058] Furthermore, the upper side fabric of the industrial fabric 100 is woven from upper side warp yarns (1Ub, 4Ub, 7Ub, 10Ub) serving as upper side knot yarns, lower side warp yarns (2Lb, 5Lb, 8Lb, 11Lb) serving as lower side knot yarns, and upper side weft yarns (1'U to 16'U). The upper side knot yarns and lower side knot yarns complement the surface structure of the upper side fabric. Thus, the two warp yarns complement each other, preventing the structure from collapsing even at the knotted areas, thereby improving surface finish. Furthermore, the upper side knot yarns and lower side knot yarns complement the surface structure of the lower side fabric. In addition, in the industrial fabric 100 of this embodiment, the surface structure of the upper side fabric is plain woven. This improves fiber support and surface smoothness.

[0059] Next, the internal wear of the papermaking wire mesh in a multi-layered fabric is explained. Generally, if the bonding force between the upper wire mesh (top side fabric) and the lower wire mesh (bottom side fabric) is weak, the upper and lower wire meshes will rub against each other due to the high-speed rotation of the papermaking machine, and internal wear may occur. If such internal wear occurs, the dehydration and strength of the wire mesh will decrease, thus hindering stable papermaking. Therefore, in this embodiment, the industrial fabric 100 removes the warp yarns that are only woven into the weft yarns on the top side, and uses 2 / 3 of all warp yarns as binding yarns. In this way, by removing the warp yarns that are only woven into the weft yarns on the top side and increasing the number of binding yarns, the bonding force between the top and bottom side fabrics can be strengthened, and internal wear can be suppressed.

[0060] Next, the structure of the back side of the industrial fabric 100 of this embodiment (the surface structure of the underside fabric) will be described. For example, the industrial fabric 100 incorporates two warp yarns, underside warp yarn 2Lb and underside warp yarn 3L, into a single underside weft yarn 11'L. Therefore, compared to a structure where one warp yarn is woven into one underside weft yarn, the spacing of the yarn knots in the underside weft yarn is larger. Since wear on the mechanical surface is primarily borne by the underside weft yarn, the larger yarn knots in the underside weft yarn can improve the wear-affected lifespan.

[0061] Furthermore, in the underside fabric of the industrial fabric 100, the underside warp yarns (3L, 6L, 9L, 12L) that are not knotting yarns are woven in such a manner that they pass over four underside weft yarns, under one underside weft yarn, over two underside weft yarns, and under one underside weft yarn in sequence. Moreover, for example, regarding underside warp yarn 3L, the portion in which it weaves underside weft yarn 11'L together with the adjacent underside warp yarn 2Lb (which serves as an underside knotting yarn) and the portion in which it weaves underside weft yarn 1'L together with the adjacent upper side warp yarn 4Ub (which serves as an upper side knotting yarn) are arranged in a zigzag pattern. The other underside warp yarns (6L, 9L, 12L) are similar. Therefore, unlike plain weave, it is less prone to leaving marks.

[0062] [Second Implementation]

[0063] Figure 3 This is a design drawing illustrating the complete structure of the multilayer fabric for papermaking according to the second embodiment. Figure 4 For along Figure 3 The diagram shows cross-sectional views of each warp yarn. Furthermore, the reference numerals and labels in each diagram are the same as in the first embodiment, and descriptions are omitted where appropriate.

[0064] Figure 3 The industrial fabric 200 shown in the second embodiment is a fabric consisting of an upper side fabric composed of upper side warp yarns (1U, 4U, 7U, 10U) and upper side weft yarns (1'U to 16'U) and a lower side fabric composed of lower side warp yarns (2Lb, 3L, 5Lb, 6L, ..., 12L) and lower side weft yarns (1'L, 3'L, ..., 15'L).

[0065] Then, refer to Figure 4This describes the weaving method of each warp and weft yarn in industrial fabric 200. The upper warp yarn 1U is interwoven as follows: it passes between the upper weft yarn 1'U and the lower weft yarn 1'L, and then passes over the upper side of the upper weft yarn 2'U to form a surface side yarn knot. Then it passes between the upper weft yarn 3'U and the lower weft yarn 3L', and then passes over the upper side of the upper weft yarn 4'U to form a surface side yarn knot, ..., then passes between the upper weft yarn 13'U and the lower weft yarn 13L', and then passes over the upper side of the upper weft yarn 14'U to form a surface side yarn knot. Finally, it passes between the upper weft yarns 15'U, 16'U and the lower weft yarn 15'L.

[0066] The lower warp yarn 2Lb is adjacent to the upper warp yarn 1U and serves as the lower side joining yarn to connect the upper and lower fabrics. The lower warp yarn 2Lb is interwoven as follows: it passes between the upper weft yarns 1'U to 4'U and the lower weft yarns 1'L and 3'L, and passes under the lower weft yarn 5'L to form a back side yarn node; it passes between the upper weft yarns 6'U to 10'U and the lower weft yarns 7'L and 9'L, and passes under the lower weft yarn 11'L to form a back side yarn node; it passes between the upper weft yarns 12'U to 15'U and the lower weft yarns 13'L and 15'L, and passes over the upper side of the upper weft yarn 16'U to form a surface side yarn node.

[0067] The lower side warp yarn 3L is interwoven as follows: it passes under the lower side weft yarn 1'L to form a back side yarn knot, then passes between the upper side weft yarns 2'U~10'U and the lower side weft yarns 3'L, 5'L, 7'L, 9'L, then passes under the lower side weft yarn 11'L to form a back side yarn knot, then passes between the upper side weft yarns 12'U~16'U and the lower side weft yarns 13'L, 15'L.

[0068] The upper side warp yarn 4U is interwoven as follows: it passes over the upper side weft yarn 1'U to form a surface side yarn knot, then passes over the lower side of the upper side weft yarn 2'U, then passes over the upper side of the upper side weft yarn 3'U to form a surface side yarn knot, ..., then passes over the lower side of the upper side weft yarn 10'U, then passes over the upper side of the upper side weft yarn 11'U to form a surface side yarn knot, then passes between the upper side weft yarns 12'U~14'U and the lower side weft yarn 13L', then passes over the upper side of the upper side weft yarn 15'U to form a surface side yarn knot, and then passes over the lower side of the upper side weft yarn 16'U.

[0069] The lower warp yarn 5Lb is adjacent to the upper warp yarn 4U and serves as the lower side joining yarn to connect the upper and lower fabrics. The lower warp yarn 5Lb is interwoven as follows: it passes under the lower weft yarn 1'L to form a back side yarn node, then passes between the upper weft yarns 2'U to 6'U and the lower weft yarns 3'L and 5'L, passes under the lower weft yarn 7'L to form a back side yarn node, then passes between the upper weft yarns 8'U to 12'U and the lower weft yarns 9'L and 11'L, passes over the upper side of the upper weft yarn 13'U to form a surface side yarn node, and then passes between the upper weft yarns 14'U to 16'U and the lower weft yarn 15'L.

[0070] The lower side warp yarn 6L is interwoven as follows: it passes between the upper side weft yarns 1'U~6'U and the lower side weft yarns 1'L, 3'L, and 5'L, and passes under the lower side weft yarn 7'L to form a back side yarn knot. Then it passes between the upper side weft yarns 8'U~12'U and the lower side weft yarns 9'L and 11'L, and passes under the lower side weft yarn 13'L to form a back side yarn knot. Then it passes between the upper side weft yarns 14'U~16'U and the lower side weft yarn 15'L.

[0071] In addition, Figure 3 , Figure 4 The top side warp yarns 7U, 10U and the bottom side warp yarns 8Lb, 9L, 11Lb and 12L shown are the same as the top side warp yarns 1U, 4U and the bottom side warp yarns 2Lb, 3L, 5Lb and 6L mentioned above, except that they are woven with 8 top side weft yarns offset in the conveying direction. The description of the weaving method is omitted.

[0072] As described above, the industrial fabric 200 of this embodiment is configured such that an upper-side fabric composed of upper-side warp yarns (1U, 4U, 7U, 10U) and upper-side weft yarns (1'U to 16'U) and a lower-side fabric composed of lower-side warp yarns (2Lb, 3L, 5Lb, 6L, ..., 12L) and lower-side weft yarns (1'L, 3'L, ..., 15'L) is joined together. Figure 3 The complete organization is shown.

[0073] In the industrial fabric 200, the upper warp yarn 1U (4U, 7U, 10U) functions as an upper collapsing yarn that collapses part of the surface structure of the upper fabric while being woven into the upper weft yarn (e.g., only not forming a surface yarn knot with the upper weft yarn 16'U), and the lower warp yarn 2Lb (5Lb, 8Lb, 11Lb) functions as a lower bonding yarn that connects the upper fabric and the lower fabric.

[0074] Furthermore, in the industrial fabric 200, the number of lower side warp yarns (8) is twice the number of upper side warp yarns (4). The upper side warp yarns 1U (4U, 7U, 10U) which are upper side collapse yarns and the lower side warp yarns 2Lb (5Lb, 8Lb, 11Lb) which are lower side knot yarns are adjacent to each other. The upper side fabric is woven from at least the upper side collapse yarns (upper side warp yarns 1U, 4U, 7U, 10U), the lower side knot yarns (lower side warp yarns 2Lb, 5Lb, 8Lb, 11Lb), and the upper side weft yarns 1'U to 16'U. The upper side collapse yarns (upper side warp yarns 1U, 4U, 7U, 10U) and the lower side knot yarns (lower side warp yarns 2Lb, 5Lb, 8Lb, 11Lb) complement the surface structure of the upper side fabric.

[0075] In the industrial fabric 200 of this embodiment, the number of bottom warp yarns (8) is twice the number of top warp yarns (4). Therefore, the density of the top warp yarns is reduced, and compared with the usual ratio of top to bottom warp yarns (1:1), the top weft yarns can be woven in more times. As a result, the support of the paper raw material is improved, and the texture and retention of the paper are enhanced.

[0076] Furthermore, by using the lower-side warp yarns 2Lb, 5Lb, 8Lb, and 11Lb, which are used as lower-side knot yarns, to join the upper and lower fabrics, the number of crossing points is reduced compared to the case where upper-side knot yarns and lower-side knot yarns are used to join the upper and lower fabrics, thus ensuring high air permeability. In addition, the upper-side collapsible yarn and the lower-side knot yarn complement the surface structure of the upper fabric, thereby preventing the structure from collapsing even at the joining points, thus improving surface properties. Furthermore, in this embodiment, the upper-side collapsible yarn accounts for 1 / 3 of the total number of warp yarns, and the lower-side knot yarn accounts for 1 / 3 of the total number of warp yarns.

[0077] Furthermore, the industrial fabric 200 may also have underside warp yarns 2Lb and 5Lb as underside bonding yarns. Regarding underside warp yarn 3L, the portion in which the underside weft yarn 11'L is woven together with the adjacent underside warp yarn 2Lb, and the portion in which the underside weft yarn 1'L is woven together with the adjacent underside warp yarn 5Lb, are configured in a zigzag pattern. The other underside warp yarns (6L, 9L, 12L) are the same. Therefore, unlike plain weave, it is less prone to leaving marks.

[0078] In addition to the effects described above, the industrial fabric 200 of the second embodiment has the same effects based on the same structure as the industrial fabric 100 of the first embodiment.

[0079] [Third Implementation Method]

[0080] Figure 5This is a design drawing illustrating the complete structure of the multilayer fabric for papermaking according to the third embodiment. Figure 6 For along Figure 5 The diagram shows cross-sectional views of each warp yarn. Furthermore, the reference numerals and labels in each diagram are the same as those in the first and second embodiments, and descriptions are omitted where appropriate.

[0081] Figure 5 , Figure 6 The main feature of the industrial fabric 300 of the third embodiment shown is that the upper-side warp yarns 4U and 10U, which are not knotting yarns, are used instead of the upper-side knotting yarns 4Ub and 10Ub of the industrial fabric 100 of the first embodiment, and the lower-side warp yarns 5L and 11L, which are not knotting yarns, are used instead of the lower-side knotting yarns 5Lb and 11Lb of the industrial fabric 100. In the following description, the upper-side warp yarns 4U and 10U and the lower-side warp yarns 5L and 11L will be mainly explained.

[0082] The upper side warp yarn 4U is interwoven as follows: it passes between the upper side weft yarn 1'U and the lower side weft yarn 1'L, and over the upper side weft yarn 2U' to form a surface side yarn knot, ..., it passes between the upper side weft yarn 15'U and the lower side weft yarn 15'L, and over the upper side weft yarn 16U' to form a surface side yarn knot. The upper side warp yarn 4U is arranged on the upper side of the lower side warp yarn 5L in a manner that overlaps with the lower side warp yarn 5L.

[0083] The lower side warp yarn 5L is interwoven as follows: it passes under the lower side weft yarn 1'L to form a back side yarn knot, then passes between the upper side weft yarns 2'U~6'U and the lower side weft yarns 3'L and 5'L, passes under the lower side weft yarn 7'L to form a back side yarn knot, then passes between the upper side weft yarns 8'U~16'U and the lower side weft yarns 9'L, 11'L, 13'L, and 15'L.

[0084] In addition, Figure 5 , Figure 6 The upper side warp yarns 7Ub, 10U and the lower side warp yarns 8Lb, 9L, 11L, 12L shown are the same as the upper side warp yarns 1Ub, 4U and the lower side warp yarns 2Lb, 3L, 5L, 6L, except that they are woven by offsetting 8 upper side weft yarns in the conveying direction. The description of the weaving method is omitted.

[0085] The industrial fabric 300 of the third embodiment has the same effect as the industrial fabric 100 of the first embodiment based on the same structure.

[0086] [Fourth Implementation Method]

[0087] Figure 7 This is a design drawing illustrating the complete structure of the multilayer fabric for papermaking according to the fourth embodiment. Figure 8 For along Figure 7 The diagram shows cross-sectional views of each warp yarn. Furthermore, the reference numerals and labels in each diagram are the same as in the first to third embodiments, and descriptions are omitted where appropriate.

[0088] Figure 7 , Figure 8 The main feature of the industrial fabric 400 of the fourth embodiment shown is that the upper-side warp yarns 4U and 10U, which are not collapsed yarns, are used instead of the upper-side collapsed yarns 4U and 10U of the industrial fabric 200 of the second embodiment, and the lower-side warp yarns 5L and 11L, which are not knotting yarns, are used instead of the lower-side knotting yarns 5Lb and 11Lb of the industrial fabric 200. In the following description, the upper-side warp yarns 4U and 10U and the lower-side warp yarns 5L and 11L will be mainly explained.

[0089] The upper side warp yarn 4U is interwoven as follows: it passes over the upper side weft yarn 1'U to form a surface side yarn knot, then passes over the lower side of the upper side weft yarn 2'U, then over the upper side of the upper side weft yarn 3'U to form a surface side yarn knot, ..., then passes over the lower side of the upper side weft yarn 14'U, then over the upper side of the upper side weft yarn 15'U to form a surface side yarn knot, and then passes over the lower side of the upper side weft yarn 16'U. The upper side warp yarn 4U is arranged on the upper side of the lower side warp yarn 5L in a manner that overlaps with the lower side warp yarn 5L.

[0090] The lower side warp yarn 5L is interwoven as follows: it passes under the lower side weft yarn 1'L to form a back side yarn knot, then passes between the upper side weft yarns 2'U~6'U and the lower side weft yarns 3'L and 5'L, passes under the lower side weft yarn 7'L to form a back side yarn knot, then passes between the upper side weft yarns 8'U~16'U and the lower side weft yarns 9'L, 11'L, 13'L, and 15'L.

[0091] In addition, Figure 7 , Figure 8 The upper warp yarns 7U, 10U and the lower warp yarns 8Lb, 9L, 11L and 12L shown are the same as the upper warp yarns 1U, 4U and the lower warp yarns 2Lb, 3L, 5L and 6L, except that they are woven by offsetting the upper weft yarns by 8 in the conveying direction. The description of the weaving method is omitted.

[0092] The industrial fabric 400 of the fourth embodiment has the same effect as the industrial fabric 200 of the second embodiment based on the same structure.

[0093] [Processing Content]

[0094] In the industrial fabrics of the above embodiments, the following processing can be performed. For example, in order to improve the smoothness of the surface, an abrasive processing of 0.02 to 0.05 mm can be applied to the surface side of the industrial fabric. In particular, an abrasive processing of 0.02 mm or 0.03 mm can be applied to the surface side.

[0095] In addition, to prevent the yarn from unraveling at the ends of the mesh (industrial fabric), it can be reinforced by coating a 5mm to 30mm area from the ends of the mesh with polyurethane resin (especially up to 5mm, 10mm, and 20mm). The coating can be applied to one side or both sides. The resin can be a hot melt polyurethane.

[0096] To improve the abrasion resistance of the mesh ends, resin strips with a width of approximately 7 mm, ranging from 3 to 16 strips (especially 3, 4, 7, 8, 10, 12, 15, and 16 strips), can be applied along the entire length of the mesh, extending from 20 to 500 mm from the ends (especially from 25, 50, 75, 100, 150, 250, 300, 350, and 400 mm). These multiple polyurethane resin strips can be applied to both ends of the mesh or only to one side. The resin can be a polyurethane hot melt.

[0097] Furthermore, to improve stain resistance, resin can be used to coat the entire wire mesh. Additionally, to trim the paper width near the ends of the wire mesh, a strip of resin with widths of approximately 3, 5, 7, 10, 15, and 20 mm can be applied along the entire length of the wire mesh, from 10 mm to 500 mm from the ends (especially 10, 15, 20, 25, 30, 40, 50, 75, 100, 150, 200, 250, 300, 350, and 400 mm). The resin can be applied to both ends of the wire mesh or only to one side. The resin can be polyurethane or a hot melt resin. Furthermore, lines approximately 25 mm or 50 mm wide can be drawn along the entire width of the wire mesh to indicate the bending of the wire mesh in use.

[0098] [Specifications (spec)]

[0099] Next, the preferred specifications of the industrial fabrics for each embodiment will be described in detail. First, the definition of warp density will be explained.

[0100] (1) The warp density on the top side of industrial fabric 100 = (number of top side knots (1Ub, 4Ub, 7Ub, 10Ub) + number of bottom side knots (2Lb, 5Lb, 8Lb, 11Lb) / 2 / 1 inch

[0101] (2) The warp density on the top side of industrial fabric 200 = (number of top side collapsed yarns (1U, 4U, 7U, 10U)) / 1 inch

[0102] (3) The warp density on the top side of industrial fabric 300 = (number of warp yarns on the top side (4U, 10U) + (number of knotted yarns on the top side (1Ub, 7Ub) + number of knotted yarns on the bottom side (2Lb, 8Lb)) / 2) / 1 inch

[0103] (4) The warp density on the top side of industrial fabric 400 = (number of warp yarns on the top side (4U, 10U) + number of sag yarns on the top side (1U, 7U)) / 1 inch

[0104] (5) The underside warp density in industrial fabric 100 and industrial fabric 300 = (number of underside warp yarns (3L, 6L, 9L, 12L) + (number of top side knot yarns (1Ub, 4Ub, 7Ub, 10Ub) + number of underside knot yarns (2Lb, 5Lb, 8Lb, 11Lb)) / 2) / 1 inch

[0105] (6) The underside warp density in Industrial Fabric 200 and Industrial Fabric 400 = (number of underside warp yarns (3L, 6L, 9L, 12L) + number of underside knot yarns (2Lb, 5Lb, 8Lb, 11Lb)) / 1 inch

[0106] In the above definition of warp density, the total number of warp yarns on the top side in each embodiment can be 30 to 150 per inch. Furthermore, the total number of weft yarns on the top side can be 20 to 150 per inch.

[0107] Then, examples of specific yarn combinations are shown.

[0108] (Example 1)

[0109] Top side warp yarn: 0.12mm diameter, PET yarn

[0110] Top side-jointed yarn: 0.12mm diameter, PET yarn.

[0111] The lower side-jointed yarn: 0.12mm diameter, PET thread.

[0112] Bottom side warp yarn: 0.15mm diameter, PET thread

[0113] Warp density on the top side: 75 yarns / inch

[0114] Warp density on the bottom side: 150 yarns / inch

[0115] Top side weft yarn: 0.12mm diameter, PET and polyamide yarn

[0116] Upward weft yarn density: 100 yarns / inch

[0117] The lower side weft yarn: 0.27mm diameter, PET and polyamide yarn.

[0118] Weft yarn density: 50 yarns / inch

[0119] Mesh thickness: 0.650mm

[0120] Breathability: 150cm 3 / cm 2 / s

[0121] The industrial fabric woven using the yarn of Example 1 has a lower warp yarn that is thicker than the upper warp yarn and the knotting yarn. Therefore, the industrial fabric is less prone to stretching in the length direction, enabling stable operation during use. Furthermore, the upper weft yarn can be woven in more times, thus improving fiber support.

[0122] (Example 2)

[0123] Top side-jointed yarn: 0.13mm diameter, PET yarn

[0124] The lower side-jointed yarn: 0.13mm diameter, PET thread.

[0125] Bottom side warp yarn: 0.13mm diameter, PET yarn

[0126] Warp density on the top side: 70 yarns / inch

[0127] Warp density on the bottom side: 140 yarns / inch

[0128] Top side weft yarn: 0.12mm diameter, PET yarn

[0129] Upward weft yarn density: 100 yarns / inch

[0130] The lower side weft yarn: 0.27mm diameter, PET and polyamide yarn.

[0131] Weft yarn density: 50 yarns / inch

[0132] Mesh thickness: 0.660mm

[0133] Breathability: 150cm 3 / cm 2 / s

[0134] The industrial fabric woven using the yarn of Example 2 has uniform dehydration properties because the top side knot yarn, the bottom side knot yarn, and the bottom side warp yarn have the same yarn diameter.

[0135] (Example 3)

[0136] Top side-jointed yarn: 0.12mm diameter, PET yarn.

[0137] The lower side-jointed yarn: 0.12mm diameter, PET thread.

[0138] Bottom side warp yarn: 0.22mm diameter, PET yarn

[0139] Warp density on the top side: 60 yarns / inch

[0140] Warp density on the bottom side: 120 yarns / inch

[0141] Top side weft yarn: 0.13mm diameter, PET yarn

[0142] Upward weft yarn density: 77 yarns / inch

[0143] The lower side weft yarn: 0.25mm diameter, PET and polyamide yarn.

[0144] Weft yarn density: 50 yarns / inch

[0145] Mesh thickness: 0.680mm

[0146] Breathability: 137cm 3 / cm 2 / s

[0147] The industrial fabric woven using the yarn of Example 3 has a thicker lower side warp yarn than upper side knot yarn and lower side knot yarn, so the industrial fabric is less likely to stretch in the length direction, thus increasing its rigidity.

[0148] (Example 4)

[0149] Top side warp yarn: 0.17mm diameter, PET yarn

[0150] Top side-jointed yarn: 0.17mm diameter, PET yarn

[0151] The lower side-jointed yarn: 0.17mm diameter, PET thread.

[0152] Bottom side warp yarn: 0.17mm diameter, PET yarn

[0153] Warp density on the top side: 50 yarns / inch

[0154] Warp density on the bottom side: 100 yarns / inch

[0155] Top side weft yarn: 0.15mm diameter, PET yarn

[0156] Upward weft yarn density: 80 yarns / inch

[0157] The lower side weft yarn: 0.30mm diameter, PET and polyamide yarn.

[0158] Weft yarn density: 40 yarns / inch

[0159] Mesh thickness: 0.880mm

[0160] Breathability: 170cm 3 / cm 2 / s

[0161] The industrial fabric woven using the yarn from Example 4 has an increased yarn diameter, thereby improving rigidity.

[0162] In addition, the diameter and density of each yarn can be appropriately selected according to the required performance. For example, the warp yarn can be combined as follows.

[0163] With a warp diameter of 0.13mm, the warp density on the top side is 70 threads / inch, and the warp density on the bottom side is 140 threads / inch.

[0164] With a warp diameter of 0.15mm, the warp density on the top side is 60 threads / inch, and the warp density on the bottom side is 120 threads / inch.

[0165] With a warp diameter of 0.17mm, the warp density on the top side is 50 threads / inch, and the warp density on the bottom side is 100 threads / inch.

[0166] With a warp diameter of 0.20 mm, the warp density on the top side is 45 threads / inch, and the warp density on the bottom side is 90 threads / inch.

[0167] With a warp diameter of 0.22mm, the warp density on the top side is 40 threads / inch, and the warp density on the bottom side is 80 threads / inch.

[0168] With a warp diameter of 0.25mm, the warp density on the top side is 35 threads / inch, and the warp density on the bottom side is 70 threads / inch.

[0169] With a warp diameter of 0.30mm, the warp density on the top side is 30 threads / inch, and the warp density on the bottom side is 60 threads / inch.

[0170] In addition, the weft yarn can be in the following combinations.

[0171] With an upper weft yarn diameter of 0.12 mm and a lower weft yarn diameter of 0.27 mm, the upper weft yarn density is 100 yarns / inch and the lower weft yarn density is 50 yarns / inch.

[0172] With an upper weft yarn diameter of 0.13 mm and a lower weft yarn diameter of 0.27 mm, the upper weft yarn density is 90 yarns / inch and the lower weft yarn density is 45 yarns / inch.

[0173] With an upper weft yarn diameter of 0.15mm and a lower weft yarn diameter of 0.30mm, the upper weft yarn density is 80 yarns / inch and the lower weft yarn density is 40 yarns / inch.

[0174] With an upper weft yarn diameter of 0.17 mm and a lower weft yarn diameter of 0.30 mm, the upper weft yarn density is 70 yarns / inch and the lower weft yarn density is 35 yarns / inch.

[0175] With an upper weft yarn diameter of 0.20 mm and a lower weft yarn diameter of 0.35 mm, the upper weft yarn density is 60 yarns / inch and the lower weft yarn density is 30 yarns / inch.

[0176] With an upper weft yarn diameter of 0.27 mm and a lower weft yarn diameter of 0.40 mm, the upper weft yarn density is 50 yarns / inch and the lower weft yarn density is 25 yarns / inch.

[0177] With an upper weft yarn diameter of 0.30 mm and a lower weft yarn diameter of 0.45 mm, the upper weft yarn density is 40 yarns / inch and the lower weft yarn density is 20 yarns / inch.

[0178] The following lists a range of preferred elements for industrial fabrics, including the examples described above. The warp diameter is preferably 0.10–1.0 mm, more preferably 0.1–0.5 mm, and particularly preferably 0.11–0.35 mm. Furthermore, the weft diameter is preferably 0.10–1.0 mm, more preferably 0.12–0.6 mm, and particularly preferably 0.12–0.55 mm.

[0179] The top weft yarn can be made of PET yarn only, polyamide yarn only, or a combination of PET and polyamide yarns interwoven. The bottom weft yarn can be made of PET yarn only, polyamide yarn only, or a combination of PET and polyamide yarns interwoven. Furthermore, to reduce the mechanical drive load, low-friction yarns can be woven into the bottom weft yarn.

[0180] The ratio of the number of weft yarns on the top side to the number of weft yarns on the bottom side can be 1:1, 2:1, 3:1, 4:1, 3:2, 4:3, 5:2, 5:3, or 5:4. The optimal air permeability is 100cm. 3 / cm 2 / s~600cm 3 / cm 2 / s, more preferably 120cm 3 / cm 2 / s~300cm 3 / cm 2 / s.

[0181] The wire thickness is preferably 0.3mm to 3.0mm, more preferably 0.5mm to 2.5mm, and particularly preferably 0.5mm to 1.0mm. As for its applications, it is mainly used as a conveyor belt for papermaking and nonwoven fabric production, especially as a dewatering conveyor belt for papermaking and a conveyor belt for transporting spunbond nonwoven fabrics.

[0182] The cross-sectional shapes of the warp and weft yarns in the above embodiments are not limited to circles; yarns with square shapes, star shapes, elliptical shapes, hollow shapes, core-sheath structures, etc., can be used. In particular, by making the cross-sectional shape of the lower warp yarn square, rectangular, or elliptical, the cross-sectional area of ​​the yarn can be increased, thereby improving tensile strength and rigidity.

[0183] Furthermore, the material used for yarn can be freely selected within the range of desired characteristics, and can include: polyethylene terephthalate (PET), polyester, polyamide, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, aramid, polyetheretherketone, polyethylene naphthalate, polytetrafluoroethylene, cotton, wool, metals, thermoplastic polyurethane, thermoplastic elastomers, etc. Of course, copolymers, yarns blended from these materials, or yarns containing various substances can also be used, depending on the purpose. Generally, polyester monofilament, which has rigidity and excellent dimensional stability, is preferred in yarns constituting industrial fabrics.

[0184] The preferred warp yarn counts are 6, 9, 12, 15, 18, and 24. The preferred weft yarn counts are 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, and 48.

[0185] The present invention has been described above with reference to the various embodiments described above, but the present invention is not limited to the embodiments described above. Appropriate combinations and substitutions of the structures of the various embodiments are also included in the present invention. In addition, the combination and processing order of the various embodiments can be appropriately changed based on the knowledge of those skilled in the art, and various modifications such as design changes can be made to the various embodiments. Embodiments with such modifications are also within the scope of the present invention.

[0186] (Industry availability)

[0187] This invention relates to industrial fabrics for use in papermaking machines.

[0188] (Explanation of reference numerals in the attached diagram)

[0189] 1'L: Bottom weft yarn; 1'U: Top weft yarn; 1Ub: Top warp yarn; 2Lb: Bottom warp yarn; 3L: Bottom warp yarn; 4Ub: Top warp yarn;

[0190] 5Lb: Bottom side warp; 6L: Bottom side warp; 7Ub: Top side warp;

[0191] 8Lb: Bottom side warp; 9L: Bottom side warp; 10Ub: Top side warp; 11Lb: Bottom side warp; 12L: Bottom side warp; 100: Industrial fabric.

Claims

1. An industrial fabric, comprising an upper fabric composed of upper-side warp and upper-side weft yarns and a lower-side fabric composed of lower-side warp and lower-side weft yarns, characterized in that, Includes the joining yarn that connects the upper side fabric and the lower side fabric. The knotting yarn functions as at least one of the upper side warp and the lower side warp, and is adjacent to the other of the upper side warp and the lower side warp. The number of the lower side warp yarns is twice the number of the upper side warp yarns.

2. The industrial fabric according to claim 1, characterized in that, The surface structure of the upper side fabric is complementary to the other side of the upper and lower side warps adjacent to the knotting yarn.

3. The industrial fabric according to claim 1 or 2, characterized in that, The first warp yarn of the upper side warp yarn functions as the upper side bonding yarn that connects the upper side fabric and the lower side fabric. The second warp yarn of the lower side warp yarn functions as the lower side bonding yarn that connects the upper side fabric and the lower side fabric. The upper side-joined yarn and the lower side-joined yarn are adjacent.

4. The industrial fabric according to claim 1 or 2, characterized in that, Collapsed yarn causes a portion of the surface structure to collapse as it is woven into the weft yarn. The first warp yarn of the upper side warp yarn functions as the collapsed yarn. The bonding yarn and the collapsed yarn adjacent to the bonding yarn have complementary surface structures.

5. The industrial fabric according to claim 3, characterized in that, The lower side joining yarn has a first lower side joining yarn and a second lower side joining yarn that are respectively adjacent to both sides of the lower side warp yarn. The lower side warp yarn has a portion that weaves the lower side weft yarn together with the adjacent first lower side knot yarn, and a portion that weaves the lower side weft yarn together with the adjacent second lower side knot yarn.

6. The industrial fabric according to claim 3, characterized in that, The lower side joining yarn has a first lower side joining yarn and a second lower side joining yarn that are respectively adjacent to both sides of the lower side warp yarn. In the lower side warp yarns, the portion of the lower side weft yarn woven in together with the adjacent first lower side knot yarn and the portion of the lower side weft yarn woven in together with the adjacent second lower side knot yarn are configured as serrated.

7. The industrial fabric according to claim 1 or 2, characterized in that, The lower side warp yarn passes over four lower side weft yarns.

8. The industrial fabric according to claim 2, characterized in that, The connecting yarn and the warp yarn adjacent to the connecting yarn weave in the underside weft yarn, and each warp row forms the underside fabric using the same weaving method.

9. The industrial fabric according to claim 1 or 2, characterized in that, The warp yarns weave in the underside weft yarns, and each warp row forms the underside fabric using the same weaving method.

10. The industrial fabric according to claim 1 or 2, characterized in that, In the lower side fabric, in the knot yarn and the warp yarn adjacent to the knot yarn, each warp yarn row passes sequentially above 4 lower side weft yarns, below 1 lower side weft yarn, above 2 lower side weft yarns, and below 1 lower side weft yarn.

11. The industrial fabric according to claim 1 or 2, characterized in that, The warp yarns weave in the upper side weft yarns, and each warp row forms the upper side fabric using the same weaving method.

12. The industrial fabric according to claim 1 or 2, characterized in that, The surface weave of the upper side fabric is plain weave.

13. The industrial fabric according to claim 1 or 2, characterized in that, In a complete fabric, the warp yarns are either 12-count or 24-count.

14. The industrial fabric according to claim 1 or 2, characterized in that, In a complete weave, the weft yarn is either 24 or 48 count.

15. The industrial fabric according to claim 1 or 2, characterized in that, The total number of warp threads on the upper side is 30 to 150 per inch.

16. The industrial fabric according to claim 1 or 2, characterized in that, The total number of weft yarns on the upper side is 20 to 150 per inch.

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