industrial fabric

Abstract

An industrial fabric having an upper side fabric including upper side warp yarns and upper side weft yarns, a lower side fabric including lower side warp yarns and lower side weft yarns, and binder warp yarns for binding the upper side fabric and the lower side fabric, the binder warp yarns being used to form a part of the upper side fabric and a part of the lower side fabric, has a first warp yarn pair formed by an upper and lower adjacent pair of the binder warp yarns, and a second warp yarn pair formed by an upper side warp yarn and a lower side warp yarn arranged upper and lower. The upper side warp yarns are woven only with the upper side weft yarns, and the lower side warp yarns are woven only with the lower side weft yarns, the weave pattern being repeated by the first warp yarn pair arranged in three groups along the weft direction and the second warp yarn pair arranged adjacent to the first warp yarn pair arranged in three groups along the weft direction.

Description

Technical Field

[0001] This invention relates to industrial fabrics for use in papermaking machines. Background Technology

[0002] Papermaking wires, woven from warp and weft yarns, have long been widely used as industrial fabrics for papermaking machines. The required properties of papermaking wires vary widely. For example, Patent Document 1 discloses an industrial two-layer fabric in which multiple warp pairs, forming a group of upper-side warp yarns and adjacent lower-side warp yarns, have a first warp pair consisting of warp yarn knots for joining the upper and lower fabrics, and a second warp pair without warp yarn knots. In the complete weave of this industrial two-layer fabric, four groups of first warp pairs and four groups of second warp pairs are arranged.

[0003] (Existing technical literature)

[0004] (Patent Documents)

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-017340 Summary of the Invention

[0006] (The problem the invention aims to solve)

[0007] In the technology described in Patent Document 1, there is a risk that the force used to join the upper and lower fabrics weakens, causing internal friction between the upper and lower fabrics. On the other hand, at the location where the warp joining yarn is woven from the upper fabric into the lower fabric, a depression is created in the upper fabric. Therefore, if the ratio of the number of warp joining yarns in the warp yarns used to form the fabric is too large, there is a risk that the surface smoothness of the fabric will be reduced.

[0008] The purpose of this invention is to provide an industrial fabric that can suppress the reduction of surface smoothness while ensuring sufficient force to bond the upper and lower fabrics.

[0009] (The measures taken to solve the problem)

[0010] To address the aforementioned problems, one aspect of the present invention provides an industrial fabric comprising: an upper side fabric including upper side warp yarns and upper side weft yarns; a lower side fabric including lower side warp yarns and lower side weft yarns; and bonding warp yarns for joining the upper side fabric and the lower side fabric while simultaneously constituting a part of the upper side fabric and a part of the lower side fabric. The industrial fabric further comprises: a first warp pair consisting of a pair of adjacent bonding warp yarns, and a second warp pair consisting of adjacent upper side warp yarns and lower side warp yarns. The upper side warp yarns are woven only into the upper side weft yarns, and the lower side warp yarns are woven only into the lower side weft yarns, repeating a woven pattern formed by three sets of first warp yarn pairs arranged along the weft direction and second warp yarn pairs arranged adjacent to the three sets of first warp yarn pairs arranged along the weft direction.

[0011] (The effect of the invention)

[0012] According to the present invention, an industrial fabric can be provided that can sufficiently ensure the force connecting the upper and lower fabrics while suppressing the reduction of surface smoothness. Attached Figure Description

[0013] Figure 1 A design diagram illustrating the complete structure of the industrial fabric of the first embodiment.

[0014] Figure 2 For along Figure 1 A cross-sectional view of the warp direction of the warp yarns of an industrial fabric shown.

[0015] Figure 3 A design diagram illustrating the complete structure of the industrial fabric of the second embodiment.

[0016] Figure 4 For along Figure 3 A cross-sectional view of the warp direction of the warp yarns of an industrial fabric shown. Detailed Implementation

[0017] In the following description, "warp yarn" refers to the yarn extending along the direction of paper feed when the multi-layered fabric for papermaking is used as a circular conveyor belt, and "weft yarn" refers to the yarn extending in the direction intersecting with the warp yarn. Furthermore, "top side fabric" refers to the fabric on the top side of the papermaking wire used for feeding paper feed when the multi-layered fabric is used as a papermaking wire, and "bottom side fabric" refers to the fabric on the bottom side of the papermaking conveyor belt, primarily used for contact with the drive rollers. Additionally, "surface" simply 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 wire, and the "surface" of the bottom side fabric corresponds to the back side of the papermaking wire.

[0018] 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 portion of a warp yarn that is exposed on the surface above or below one or more weft yarns.

[0019] In addition, "joining warp" refers to at least a portion of the warp yarns that constitute the upper and lower side fabrics, which are woven into the upper and lower side fabrics to join the upper and lower side fabrics.

[0020] (First Embodiment)

[0021] Figure 1 A design diagram showing the complete structure of the industrial fabric 10 of the first embodiment. Figure 2 For along Figure 1 A cross-sectional view of the warp direction of the warp yarns of the industrial fabric 10 shown.

[0022] In the design drawings, warp yarns are represented by Arabic numerals, such as 1, 2, 3... Weft yarns are represented by Arabic numerals with apostrophes, such as 1', 2', 3'... Top side yarns are represented by numbers with the letter U, and bottom side yarns by numbers with the letter L, for example, top side warp 1U, bottom side weft 2'L, etc. Furthermore, the joining yarns that connect the top and bottom side fabrics are represented by numbers with the letter B; the first joining warp yarn is represented as Bf, and the second joining warp yarn as Bs.

[0023] Furthermore, in the design drawing, the × mark indicates that the upper side warp yarn and the first knot warp yarn are positioned above the upper side weft yarn; the ○ mark indicates that the lower side warp yarn and the second knot warp yarn are positioned below the lower side weft yarn; the △ mark indicates that the first knot warp yarn is positioned below the lower side weft yarn; and the ▲ mark indicates that the second knot warp yarn is positioned above the upper side weft yarn. The ×, ○, △, and ▲ marks represent yarn knots.

[0024] Figure 1 The industrial fabric 10 of the first embodiment shown includes: an upper side fabric composed of upper side warp yarns (4U, 8U) and upper side weft yarns (1'U to 8'U), a lower side fabric composed of lower side warp yarns (4L, 8L) and lower side weft yarns (1'L to 8'L), and a connecting warp yarn connecting the upper side fabric and the lower side fabric.

[0025] The knotting warp yarns are woven into both the upper weft yarns (1'U~8'U) and the lower weft yarns (1'L~8'L). The knotting warp yarns include first knotting warp yarns (1Bf~3Bf, 5Bf~7Bf) and second knotting warp yarns (1Bs~3Bs, 5Bs~7Bs), forming part of both the upper and lower fabrics. In the complete weave, there are six first knotting warp yarns (1Bf~3Bf, 5Bf~7Bf) and six second knotting warp yarns (1Bs~3Bs, 5Bs~7Bs). The first and second knotting warp yarns (1Bf~3Bf, 5Bf~7Bf) are adjacent to each other, forming six pairs of first warp yarns (1~3, 5~7) in the complete weave.

[0026] The top side warp yarns (4U, 8U) are woven only into the top side weft yarns (1'U~8'U). The bottom side warp yarns (4L, 8L) are woven only into the bottom side weft yarns (1'L~8'L). The top side warp yarns (4U, 8U) and the bottom side warp yarns (4L, 8L) are adjacent to each other, forming two sets of second warp yarn pairs (4, 8) in the complete weave, with two yarns used on each side. The top side weft yarns (1'U~8'U) and the bottom side weft yarns (1'L~8'L) each have eight yarns in the complete weave.

[0027] Next, refer to Figure 2 (a) and Figure 2 Section (b) describes the weaving method of each warp and weft yarn in the industrial fabric 10. Figure 2 (a) and Figure 2 The configuration of the upper side weft yarn (1'U~8'U) and the lower side weft yarn (1'L~8'L) shown in (b) is the same.

[0028] Figure 2 (a) shows the configuration in which the first warp pair of the first connecting warp 1Bf and the second connecting warp 1Bs is woven into the upper side weft yarn (1'U~8'U) and the lower side weft yarn (1'L~8'L). Figure 2 As shown in (a), the first connecting warp 1Bf and the second connecting warp 1Bs are adjacent to each other to form the first warp pair, and they cross each other for the purpose of connecting.

[0029] The first connecting warp yarn 1Bf passes over the upper side of the upper weft yarns (1'U, 7'U) to form two upper side yarn knots N1, and then passes under the upper side weft yarns (2'U~6'U, 8'U). Furthermore, the first connecting warp yarn 1Bf passes under the lower side weft yarn 4L to form a lower side connecting yarn N2, and then passes over the lower side weft yarns (1'L~3'L, 5'L~8'L). In other words, the first connecting warp yarn 1Bf forms two upper side yarn knots N1 on the upper side weft yarns (1'U, 7'U) and one lower side yarn knot N2 on the lower side weft yarn 4'L.

[0030] The first knot warp (2Bf~3Bf, 5Bf~7Bf) includes warp yarns whose weaving positions are offset in the warp direction from those of the first knot warp 1Bf, but have the same (common) weaving pattern as the first knot warp 1Bf, forming two upper side yarn nodes N1 and one lower side yarn node N2.

[0031] The second connecting warp yarn 1Bs passes over the upper side of the upper weft yarns (3'U, 5'U) to form two upper side yarn knots N1, and then passes under the upper side of the upper side weft yarns (1'U, 2'U, 4'U, 6'U to 8'U). Furthermore, the second connecting warp yarn 1Bs passes under the lower side of the lower side weft yarn 8L to form a lower side connecting yarn N2, and then passes over the lower side weft yarns (1'L to 7'L). In other words, the second connecting warp yarn 1Bs forms two upper side yarn knots N1 on the upper side weft yarns (3'U, 5'U) and one lower side yarn knot N2 on the lower side weft yarn 8'L.

[0032] The second joining warp yarns (2Bs~3Bs, 5Bs~7Bs) include warp yarns whose weaving positions are offset in the warp direction from those of the second joining warp yarn 1Bs, but have the same (common) weaving pattern as the second joining warp yarn 1Bs, forming two upper side yarn nodes N1 and one lower side yarn node N2. Thus, the first joining warp yarns (1Bf~3Bf, 5Bf~7Bf) and the second joining warp yarns (1Bs~3Bs, 5Bs~7Bs) form two upper side yarn nodes N1 and one lower side yarn node N2, and form the same (common) weaving pattern. The weaving patterns of the first joining warp yarns and the second joining warp yarns are the same (common).

[0033] The first warp pair 1, composed of the first connecting warp yarn 1Bf and the second connecting warp yarn 1Bs, forms two upper-side yarn knots N1, thereby forming a weaving pattern on the surface of the upper-side fabric where the upper-side weft yarns (1'U~8'U) are woven in alternately one by one. The first warp pair, composed of the first connecting warp yarns (2Bf~3Bf, 5Bf~7Bf) and the second connecting warp yarns (2Bs~3Bs, 5Bs~7Bs), also forms a weaving pattern on the surface of the upper-side fabric where the upper-side weft yarns (1'U~8'U) are woven in alternately one by one. Thus, the first warp pairs (1~3, 5~7) form yarn knots with respect to the upper-side weft yarns (1'U~8'U) at constant intervals, forming the same (common) plain weave weaving pattern without altering the surface structure.

[0034] The first warp pair 1, consisting of the first knotted warp yarn 1Bf and the second knotted warp yarn 1Bs, each forms a lower side yarn knot N2. This creates an inlay pattern that passes under one lower side weft yarn (4'L, 8'L) and over three consecutive lower side weft yarns (1'L~3'L, 5'L~7'L), forming a so-called 1 / 3 weave pattern. The first warp pair, consisting of the first knotted warp yarns (2Bf~3Bf, 5Bf~7Bf) and the second knotted warp yarns (2Bs~3Bs, 5Bs~7Bs), also forms a 1 / 3 weave pattern. Thus, the first warp pairs (1~3, 5~7) form yarn knots with a constant interval relative to the lower side weft yarns (1'L~8'L), creating the same (common) 1 / 3 weave pattern, and are woven in without altering the surface weave.

[0035] Figure 2 (b) shows the pattern in which the second warp pair 4, consisting of the upper warp 4U and the lower warp 4L, is woven into the upper weft (1'U~8'U) and the lower weft (1'L~8'L). Figure 2 As shown in (b), the upper warp yarn 4U is woven only into the upper weft yarn (1'U~8'U), and the lower warp yarn 4L is woven only into the lower weft yarn (1'L~8'L).

[0036] The upper side warp yarn 4U passes over the upper side weft yarns (2'U, 4'U, 6'U, 8'U) to form the upper side yarn node N1, and then passes under the upper side weft yarns (1'U, 3'U, 5'U, 7'U). The upper side warp yarn 4U is woven into the upper side weft yarns (1'U~8'U) in a plain weave, forming a weave pattern on the surface of the upper side fabric in which the upper side weft yarns (1'U~8'U) are woven in alternately up and down one by one.

[0037] The upper side warp yarn 8U has the same weaving pattern as the upper side warp yarn 4U, forming a pattern in which the upper side weft yarns (1'U~8'U) are woven in alternately one by one.

[0038] The lower side warp yarn 4L passes under the lower side weft yarns (3'L, 7'L) to form the lower side knot yarn N2, and then passes over three consecutive lower side weft yarns (1'L~2'L, 4'L~6'L, 8'L). The lower side warp yarn 4L forms yarn knots with a constant interval to the lower side weft yarns (1'L~8'L), forming a 1 / 3 weave pattern.

[0039] The lower side warp yarn 8L forms yarn knots with the lower side weft yarns (1'L~8'L) at constant intervals, forming a 1 / 3 weave pattern similar to that of the lower side warp yarn 4L.

[0040] The warp yarns, including the top-side warp yarns (4U, 8U) and the connecting warp yarns (1Bf~3Bf, 5Bf~7Bf, 1Bs~3Bs, 5Bs~7Bs), form a weaving pattern on the surface of the top-side fabric, where the top-side weft yarns are woven in one by one. The warp yarns on the top side refer to those exposed on the top-side surface. That is, the first warp pair (1~3, 5~7) and the second warp pair (4, 8) form the same (common) weaving pattern on the surface of the top-side fabric. This improves the surface texture of the top-side fabric. Furthermore, by making the surface of the top-side fabric plain-woven, good smoothness and support for the paper fibers are obtained, thus reducing the areas where paper fibers are inserted.

[0041] The underside warp yarns (4L, 8L) and the connecting warp yarns (1Bf~3Bf, 5Bf~7Bf, 1Bs~3Bs, 5Bs~7Bs) repeatedly form an inlay pattern on the surface of the underside fabric, passing under one underside weft yarn and above three consecutive underside weft yarns. Underside warp yarns refer to the warp yarns exposed on the underside surface. That is, the first warp pair and the second warp pair form the same (common) inlay pattern on the surface of the underside fabric. Therefore, compared to plain weave, the increased number of underside weft yarns exposed on the surface of the underside fabric improves abrasion resistance.

[0042] The connecting warp yarns are woven into the upper and lower weft yarns with the same (common) weave pattern. That is, the first connecting warp yarns (1Bf~3Bf, 5Bf~7Bf) and the second connecting warp yarns (1Bs~3Bs, 5Bs~7Bs) are woven into the upper weft yarns (1'U~8'U) with the same (common) weave pattern to form a plain weave, and the first connecting warp yarns (1Bf~3Bf, 5Bf~7Bf) and the second connecting warp yarns (1Bs~3Bs, 5Bs~7Bs) are woven into the lower weft yarns (1'L~8'L) with the same (common) weave pattern to form a 1 / 3 weave with the same (common) weave pattern. As a result, the reduction of the surface properties of the industrial fabric 10 can be suppressed.

[0043] In industrial fabric 10, a repeating pattern is formed by three sets of first warp pairs (1-3, 5-7) arranged along the weft direction and second warp pairs (4, 8) arranged adjacent to the three sets of first warp pairs (1-3, 5-7) arranged along the weft direction. That is, the second warp pairs are located between the three sets of first warp pairs, with one set of second warp pairs arranged adjacent to each of the three consecutive sets of first warp pairs. In the complete weave, six of the eight warp pairs are knotted warp pairs; therefore, compared to industrial fabrics with a lower proportion of knotted warp pairs, the bonding strength between the upper and lower fabrics can be increased. By increasing the bonding strength, internal wear caused by friction between the upper and lower fabrics can be suppressed, and the surface pilling of worn yarns, which reduces dehydration performance, can be prevented. Furthermore, arranging the three sets of first warp pairs consecutively ensures the surface smoothness of the upper fabric and also improves the smoothness of the manufactured paper. For example, in a configuration arranged in the order of "first warp pair, top side warp, first warp pair, bottom side warp," in areas where the top or bottom side warp exists alone, there are fewer bottom or top side warp compared to other areas. Therefore, dehydration concentrates in these gaps, resulting in uneven dehydration speeds and a deterioration in paper quality. Furthermore, in areas lacking top side warp, grooves form on the fabric surface, further reducing the paper's smoothness. On the other hand, in industrial fabric 10, which consists only of the first and second warp pairs, uneven dehydration speeds can be suppressed.

[0044] When viewed from the vertical direction, the overlap between the first and second knotting warp yarns (1Bf-3Bf, 5Bf-7Bf) of the first warp pair is less than 50%. The vertical direction of the upper fabric is perpendicular to the upper fabric and extends along the vertical direction. For example, the area where the first knotting warp 1Bf overlaps the second knotting warp 1Bs in the vertical direction is less than 50% of the top-view area of ​​the first knotting warp 1Bf when viewed from the vertical direction, and also less than 50% of the top-view area of ​​the second knotting warp 1Bs when viewed from the vertical direction. Since the proportion of knotting warp yarns in the industrial fabric 10 is large, if the overlap between the first and second knotting warp yarns is less than 50%, the first and second knotting warp yarns are offset in the weft direction, thus creating a closed mesh (weave eye) structure in the industrial fabric 10, resulting in slow dehydration. Therefore, during the papermaking process, when the paper material falls onto the industrial fabric 10, the paper fibers are evenly dispersed, and the paper quality improves.

[0045] Furthermore, more preferably, when the upper side fabric is viewed from the vertical direction, the overlap range of the first knot warp (1Bf~3Bf, 5Bf~7Bf) and the second knot warp (1Bs~3Bs, 5Bs~7Bs) that form the first warp pair can also be less than 45%.

[0046] The warp density DW, calculated by the following mathematical formula 1, including the top side warp, the bottom side warp, and the joining warp, is over 90%.

[0047] DW=(D×M / 25.4)×100……Mathematical expression 1

[0048] DW represents the warp density, where D is the diameter (in millimeters) of the top warp, bottom warp, or splicing warp, and M represents the mesh count as the number of warp threads per inch.

[0049] This allows for an increase in warp density. By staggering the knotted warp yarns in the weft direction, a closed mesh structure can be achieved in the industrial fabric 10, reducing dehydration. Furthermore, the warp density DW is preferably 100% or higher.

[0050] The upper side yarn section N1 is formed by two adjacent pairs of first warp yarns in the weft direction. Figure 1 The X and ▲ markings are offset by one upper-side weft yarn in the warp direction. Furthermore, the upper-side yarn section N1, formed by the first adjacent warp pair in the weft direction and the upper-side warp yarn, is... Figure 1 The positions of the X and ▲ markings are offset by one upper weft yarn in the warp direction. That is, for every one warp yarn offset along the weft direction, the upper yarn knot N1 is offset along the warp direction, and the industrial fabric 10 does not form a ribbed structure on the surface of the upper fabric. When the upper yarn knot N1 formed by adjacent warp yarns in the weft direction is formed at the same position in the warp direction, that is, when it is formed with a ribbed structure on the surface of the upper fabric, the adjacent warp yarns become a group and are adjacent to each other, creating a gap between the groups. On the other hand, for each adjacent warp yarn pair, the upper yarn knot N1 is offset and evenly arranged in the warp direction, thereby reducing the gap between groups and suppressing the unevenness of the dehydration speed, and suppressing the deterioration of the paper quality.

[0051] The lower side yarn section N2 is formed by two adjacent pairs of first warp yarns in the weft direction. Figure 1 The positions of the ○ and △ markings are offset by one or more lower weft yarns in the warp direction. Furthermore, the lower yarn section N2 (formed by the adjacent lower weft yarn and the first warp yarn pair in the weft direction) Figure 1The positions of the ○ and △ markings are offset by one or more weft yarns in the warp direction. That is, for every one warp yarn offset in the weft direction, the lower side yarn node N2 is offset by one or more yarns in the warp direction, so that no ribbed structure is formed on the surface of the lower side fabric 10. For each adjacent warp yarn pair, the lower side yarn nodes N2 are evenly distributed and offset in the warp direction, thereby suppressing uneven dehydration speed and preventing the paper quality from deteriorating.

[0052] Top side-jointed yarn N1 ( Figure 1 The × and ▲ markings are configured to not be connected to the lower side of the yarn in the vertical direction. (N2) Figure 1 The ○ and △ markings overlap. This can suppress friction of the weft yarns that are pulled toward the inside of the industrial fabric 10 due to yarn knots.

[0053] (Second Embodiment)

[0054] Figure 3 This is a design drawing illustrating the complete structure of the industrial fabric 100 of the second embodiment. Figure 4 For along Figure 3 A cross-sectional view of the warp direction of the warp yarns of the industrial fabric 100 shown.

[0055] Figure 3 The industrial fabric 100 of the second embodiment shown is... Figure 1 The industrial fabric 10 shown is similar in that it has six sets of first warp pairs (1-3, 5-7) and two sets of second warp pairs (4, 8), but differs in the pattern of the warp yarns.

[0056] The first warp pair (1-3, 5-7) consists of six groups of adjacent first-joint warp yarns (1Bf-3Bf, 5Bf-7Bf) and second-joint warp yarns (1Bs-3Bs, 5Bs-7Bs). The second warp pair (4, 8) consists of two groups of adjacent upper-side warp yarns (4U, 8U) and lower-side warp yarns (4L, 8L).

[0057] Figure 4 (a) shows the configuration in which the first warp pair 1 of the first knot warp 1Bf and the second knot warp 1Bs is woven into the upper side weft yarn (1'U~8'U) and the lower side weft yarn (1'L~8'L). The first knot warp 1Bf passes over the upper side of the upper side weft yarn 1'U to form an upper side yarn knot N1, and passes under the upper side weft yarn (2'U~8'U). Furthermore, the first knot warp 1Bf passes under the lower side weft yarn 5'L to form a lower side knot N2, and passes over the lower side weft yarn (1'L~4'L, 6'L~8'L).

[0058] The first knot warp (2Bf~3Bf, 5Bf~7Bf) includes warp yarns whose weaving positions are offset in the warp direction from those of the first knot warp 1Bf, but have the same (common) weaving pattern as the first knot warp 1Bf, forming an upper side yarn node N1 and a lower side yarn node N2.

[0059] The second connecting warp yarn 1Bs passes over the upper side of the upper weft yarn 5'U to form an upper side yarn knot N1, and then passes under the upper side weft yarns (1'U~4'U, 6'U~8'U). Furthermore, the second connecting warp yarn 1Bs passes under the lower side weft yarn 1'L to form a lower side connecting yarn N2, and then passes over the lower side weft yarns (2'L~8'L). In other words, the second connecting warp yarn 1Bs forms an upper side yarn knot N1 and a lower side yarn knot N2.

[0060] The second joining warp yarns (2Bs~3Bs, 5Bs~7Bs) include warp yarns whose weaving position is offset in the warp direction from that of the second joining warp yarn 1Bs, but have the same (common) weaving pattern as the second joining warp yarn 1Bs, forming an upper side yarn node N1 and a lower side yarn node N2. The weaving patterns of the first joining warp yarns and the second joining warp yarns are the same (common).

[0061] The first warp pair 1, consisting of the first knotted warp yarn 1Bf and the second knotted warp yarn 1Bs, each forms an upper side yarn knot N1. This creates an inlay pattern that passes over the upper side of one upper side weft yarn (1'U, 5'U) and under the lower side of three consecutive upper side weft yarns (2'U~4'U, 6'U~8'U), forming a so-called 1 / 3 weave pattern. The first warp pair, consisting of the first knotted warp yarns (2Bf~3Bf, 5Bf~7Bf) and the second knotted warp yarns (2Bs~3Bs, 5Bs~7Bs), also forms a 1 / 3 weave pattern.

[0062] The first warp pair 1, consisting of the first knotted warp yarn 1Bf and the second knotted warp yarn 1Bs, each forms a bottom side yarn knot N2. This creates an inlay pattern that passes under one bottom side weft yarn (1'L, 5'L) and then under three consecutive bottom side weft yarns (2'L~4'L, 6'L~8'L), forming a 1 / 3 weave pattern. The first warp pair, consisting of the first knotted warp yarns (2Bf~3Bf, 5Bf~7Bf) and the second knotted warp yarns (2Bs~3Bs, 5Bs~7Bs), also forms a 1 / 3 weave pattern.

[0063] Figure 4 (b) shows the pattern in which the second warp pair 4, consisting of the upper warp 4U and the lower warp 4L, is woven into the upper weft (1'U~8'U) and the lower weft (1'L~8'L).

[0064] The top side warp yarn 4U passes over the top side weft yarn (3'U, 7'U) to form the top side yarn node N1, and then passes under the three consecutive top side weft yarns (1'U~2'U, 4'U~6'U, 8'U) to form a 1 / 3 weave pattern. The top side warp yarn 8U has the same weave pattern as the top side warp yarn 4U.

[0065] The lower side warp yarn 4L passes under a lower side weft yarn (3'L, 7'L) to form the lower side knot yarn N2, and then passes over three consecutive lower side weft yarns (1'L~2'L, 4'L~6'L, 8'L) to form a 1 / 3 weave pattern. The lower side warp yarn 8L has the same 1 / 3 weave pattern as the lower side warp yarn 4L.

[0066] In the industrial fabric 100, a woven pattern is repeatedly formed by three sets of first warp yarn pairs (1-3, 5-7) arranged along the weft direction and second warp yarn pairs (4, 8) arranged adjacent to the three sets of first warp yarn pairs (1-3, 5-7) arranged along the weft direction. This increases the proportion of splicing warp yarns, improves splicing strength, and ensures surface smoothness of the upper fabric by separately arranging the second warp yarn pairs.

[0067] The upper side yarn section N1 is formed by two adjacent pairs of first warp yarns in the weft direction. Figure 3 The X and ▲ markings are offset by one or more top-side weft yarns in the warp direction. Furthermore, the top-side yarn section N1, formed by the first adjacent warp pair in the weft direction and the top-side warp yarns, is... Figure 3 The X and ▲ marks are staggered by one or more top weft yarns in the warp direction. For each adjacent warp pair, the top yarn nodes N1 are staggered and evenly arranged in the warp direction, thereby suppressing uneven dehydration speed and preventing deterioration of paper quality.

[0068] The lower side yarn section N2 is formed by two adjacent pairs of first warp yarns in the weft direction. Figure 3 The positions of the ○ and △ markings are offset by one or more lower weft yarns in the warp direction. Furthermore, the lower yarn section N2 (formed by the adjacent lower weft yarn and the first warp yarn pair in the weft direction) Figure 3 The positions of the ○ and △ markings are offset by one or more lower weft yarns in the warp direction. For each adjacent warp pair, the lower yarn nodes N2 are evenly distributed and offset in the warp direction, thereby suppressing uneven dehydration speed and preventing deterioration of paper quality.

[0069] The industrial fabrics of the above embodiments can be processed as follows. For example, to improve surface smoothness, a grinding process can be applied to reduce the surface thickness of the industrial fabric to within the range of 0.02 to 0.05 mm. In particular, the surface thickness can be ground to 0.02 mm or 0.03 mm.

[0070] In addition, to prevent the yarn from unraveling at the ends of the mesh (industrial fabric), polyurethane resin can be applied to a region 5mm to 30mm from the ends of the mesh (especially the region up to 5mm, 10mm, and 20mm) for reinforcement. The coating of the mesh ends can be applied to one side or both sides. The resin can be a polyurethane hot melt adhesive.

[0071] To improve the abrasion resistance of the mesh ends, resin strips with a width of approximately 7 mm, ranging from 3 to 16 (especially 3, 4, 7, 8, 10, 12, 15, and 16 strips) can be applied along the entire length of the mesh, covering a range from 20 mm to 500 mm from the ends (especially the ranges of 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 end. The resin can be a polyurethane hot melt adhesive.

[0072] In addition, to improve stain resistance, the entire wire mesh can be coated with resin. Furthermore, for trimming the paper near the ends of the wire mesh, a strip of resin with a width of approximately 3, 5, 7, 10, 15, or 20 mm can be applied along the entire length of the 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 end. The resin can be polyurethane or hot melt adhesive. Additionally, 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 mesh in use.

[0073] The preferred ranges for the elements of the industrial fabric are listed below. The warp yarns (comprising top-side warp yarns, bottom-side warp yarns, a first-joint warp yarn, and a second-joint warp yarn) preferably have a diameter of 0.10–1.0 mm, more preferably 0.1–0.5 mm, and particularly preferably 0.11–0.35 mm. All warp yarns may have the same diameter. The bottom-side warp yarns may have the same diameter as the top-side warp yarns, or they may be set to 1.1 to 1.3 times the diameter of the top-side warp yarns. Furthermore, the weft yarns preferably have a diameter of 0.10–1.0 mm, more preferably 0.12–0.6 mm, and particularly preferably 0.12–0.55 mm. The bottom-side weft yarns preferably have a larger diameter than the top-side weft yarns, and may be 1.1 to 3.0 times the diameter of the top-side weft yarns, more preferably 1.2 to 2.0 times.

[0074] The top weft yarn can be composed solely of PET yarn, solely of polyamide yarn, or a combination of PET and polyamide yarns interwoven together. The bottom weft yarn can also be composed solely of PET yarn, solely of polyamide yarn, or a combination of PET and polyamide yarns interwoven together. Furthermore, to reduce the mechanical drive load, low-friction yarns can be woven into the bottom weft yarn.

[0075] The ventilation is preferably 100cm3 / cm2 / s to 600cm3 / cm2 / s, and more preferably 120cm3 / cm2 / s to 300cm3 / cm2 / s.

[0076] 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 application, it is mainly used as a conveyor belt for papermaking and nonwoven fabric production, and in particular, it can be used as a dewatering conveyor belt for papermaking and a conveyor belt for transporting spunbond nonwoven fabric.

[0077] 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.

[0078] Furthermore, the material used for the yarn can be freely chosen within the range that meets the target characteristics. Materials such as polyethylene terephthalate (PET), polyester, polyamide, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, aramid, polyetheretherketone, polyethylene naphthalate, polytetrafluoroethylene, cotton, wool, metals, thermoplastic polyurethane, and thermoplastic elastomers can also be used. Of course, yarns made from copolymers, blends of these materials, or containing various substances can also be used, depending on the purpose. For yarns used to construct industrial fabrics, polyester monofilaments with excellent rigidity and dimensional stability are generally preferred.

[0079] (Industry availability)

[0080] This invention relates to industrial fabrics used in papermaking machines.

[0081] (Explanation of reference numerals in the attached diagram)

[0082] 1Bf: First knot warp yarn; 1Bs: Second knot warp yarn; 1'U: Upper side weft yarn;

[0083] 1'L: Bottom side weft yarn; 4U: Top side warp yarn; 4L: Bottom side warp yarn; 10: Industrial fabric.

Claims

1. An industrial fabric comprising: an upper side fabric including upper side warp yarns and upper side weft yarns; a lower side fabric including lower side warp yarns and lower side weft yarns; and a bonding warp yarn for joining the upper side fabric and the lower side fabric while simultaneously constituting a part of the upper side fabric and a part of the lower side fabric, characterized in that, The industrial fabric comprises: The first warp pair consists of a pair of adjacent, interlocking warp yarns; and The second warp pair consists of the upper side warp yarn and the lower side warp yarn, which are adjacent to each other. The warp yarns on the upper side are woven only into the weft yarns on the upper side. The lower side warp yarns are woven only into the lower side weft yarns. The woven pattern is formed by repeating the first warp pairs arranged in three groups along the weft direction and the second warp pairs arranged adjacent to the first warp pairs arranged in three groups along the weft direction. The knotted warp yarns constituting the first warp pair form upper side yarn knots on different upper side weft yarns.

2. The industrial fabric according to claim 1, wherein, The pair of knotted warp yarns that form the first warp pair consists of a first knotted warp yarn and a second knotted warp yarn. When viewed from a vertical direction, the overlap between the first and second knotted warp yarns is less than 50 percent when viewed from above.

3. The industrial fabric according to claim 1 or 2, wherein, The warp density calculated by the following mathematical formula 1 is over 90%. DW = (D × M / 25.4) × 100……Mathematical formula 1 DW is the warp density, D is the diameter (in millimeters) of the top warp, bottom warp, or splicing warp, and M represents the mesh count as the number of warp threads per inch.

4. The industrial fabric according to claim 1 or 2, wherein, The joining warp yarns are woven into the upper side weft yarns and the lower side weft yarns with the same weaving pattern.

5. The industrial fabric according to claim 1 or 2, wherein, The upper side warp yarn and the connecting warp yarn pass over the upper side weft yarn to form an upper side yarn knot. The position of the upper side yarn node formed by two adjacent sets of the first warp yarn pairs in the weft direction is offset by one or more upper side weft yarns in the warp direction. The position of the upper side yarn knot formed by the first warp pair adjacent in the weft direction and the upper side warp yarn is offset by one or more upper side weft yarns in the warp direction.

6. The industrial fabric according to claim 1 or 2, wherein, The warp yarns on the upper side, including the warp yarns on the upper side and the connecting warp yarns, form a weaving pattern in which the weft yarns on the upper side are woven in alternately one by one.

7. The industrial fabric according to claim 1 or 2, wherein, The lower side warp yarn and the connecting warp yarn pass under the lower side weft yarn to form a lower side yarn knot. The position of the lower side yarn node formed by two adjacent sets of the first warp yarn pairs in the weft direction is offset by one or more lower side weft yarns in the warp direction. The position of the lower side yarn knot formed by the lower side warp yarn and the first warp yarn pair adjacent in the weft direction is offset by one or more lower side weft yarns in the warp direction.

8. The industrial fabric according to claim 1 or 2, wherein, The warp yarns, including the lower side warp yarns and the connecting warp yarns, repeatedly form a woven pattern that passes under one lower side weft yarn and above three consecutive lower side weft yarns.

9. The industrial fabric according to claim 1 or 2, wherein, A second warp pair is arranged adjacent to each of the three consecutive sets of first warp pairs, and three consecutive sets of first warp pairs are arranged on each of the sets of second warp pairs.

Images