阅读说明：本技术 工业用双层织物 (Industrial double-layer fabric ) 是由 上田郁夫 村上晋也 梁井英之 于 2019-07-16 设计创作，主要内容包括：提供一种满足刚性、耐磨损性、脱水性、痕迹抑制、减少保水量的低保水性这样的织物的基本特性的工业用双层织物。本发明的工业用双层织物在完整组织中至少具有第一组织和第二组织,该第一组织由2根一组的上面侧经纱和1根下面侧经纱形成,所述第二组织由1根上面侧经纱和1根下面侧经纱形成,所述第一组织与所述第二组织相邻配置,所述第一组织中的上面侧经纱由具有将上面侧织物与下面侧织物接结的功能的经纱接结纱形成,形成所述第一组织的2根一组的上面侧经纱相邻配置并在上面侧织物的表面构成局部重平组织,所述下面侧经纱的线径大于形成所述第一组织的上面侧经纱的线径,且所述第二组织中的上面侧经纱由扁平经纱形成。(Provided is an industrial double-layer fabric which satisfies the basic characteristics of a fabric such as rigidity, abrasion resistance, dewatering properties, mark suppression, and low water retention which reduces the water retention amount. The double-layer fabric for industrial use according to the present invention has, in a weave pattern, at least a first weave formed by 2 sets of upper face side warp yarns and 1 lower face side warp yarn, and a second weave formed by 1 upper face side warp yarn and 1 lower face side warp yarn, the first weave being arranged adjacent to the second weave, the upper face side warp yarn in the first weave being formed by a warp binder yarn having a function of binding the upper face side fabric and the lower face side fabric, the 2 sets of upper face side warp yarns forming the first weave being arranged adjacent to each other and constituting a partial balance weave on a surface of the upper face side fabric, the lower face side warp yarn having a larger diameter than that of the upper face side warp yarn forming the first weave, and the upper face side warp yarn in the second weave being formed by a flat warp yarn.)

1. An industrial double-layer fabric is characterized in that,

in an upper surface side fabric comprising upper surface side warp yarns and upper surface side weft yarns and an industrial double-layer fabric comprising lower surface side warp yarns and lower surface side weft yarns, the industrial double-layer fabric has at least a first weave comprising a set of 2 upper surface side warp yarns and 1 lower surface side warp yarn and a second weave comprising 1 upper surface side warp yarn and 1 lower surface side warp yarn, the first weave is arranged adjacent to the second weave, the upper surface side warp yarns in the first weave are formed by warp binder yarns having a function of binding the upper surface side fabric and the lower surface side fabric, the upper surface side warp yarns forming the set of 2 upper surface side warp yarns of the first weave are arranged adjacent to each other and form a partial heavy flat weave on the surface of the upper surface side fabric, and the diameter of the lower surface side warp yarns is larger than the diameter of the upper surface side warp yarns forming the first weave, and the upper side warp yarns in the second weave are formed by flat warp yarns.

2. The industrial double-layer fabric according to claim 1,

the diameter of the lower side warp forming the first weave is 130-300% of the diameter of the upper side warp forming the first weave.

3. The industrial double-layer fabric according to claim 1 or 2,

in the second weave, the aspect ratio of the flat warp yarns is 1.1 to 2.0.

4. The industrial double-layer fabric according to any one of claims 1 to 3,

the industrial double-layer fabric is formed by alternately arranging the first weave and the second weave.

Technical Field

The present invention relates to a novel industrial double-layer fabric which has a reduced thickness of the double-layer fabric, is excellent in rigidity, abrasion resistance, dewatering properties, and trace suppression, and can support a high-speed paper machine. In particular, the present invention relates to an industrial double-layer fabric having a flat yarn structure, which is obtained by combining a flat warp with a warp repeating structure comprising 2 upper surface side warps (coated articles prepared by coating coated articles), and further has the effects of slow dewatering and low water retention by the warp binding structure.

Background

Conventionally, as industrial fabrics, fabrics woven from warp yarns and weft yarns have been widely used, and examples thereof include papermaking fabrics, conveyor belts, filter cloths, and the like, and fabric characteristics suitable for the applications and use environments are required. Among these fabrics, the papermaking fabrics used in the paper making process, such as dewatering of the raw material by the mesh of the fabric, are particularly required to be strict. For example, there is a demand for a fabric having excellent surface smoothness, in which a yarn mark (wire mark) of the fabric is not easily transferred to paper, and also for a fabric having both of sufficient and uniform dewatering properties for dewatering excess moisture contained in a raw material, rigidity and abrasion resistance to such an extent that the fabric can be suitably used even under severe environments, and a fabric capable of maintaining desired conditions for a long time to produce good paper. Further, fiber support, improvement in papermaking yield, dimensional stability, running stability, and the like are also required. Further, in recent years, with the increase in speed of paper machines, demands for paper-making fabrics have become more stringent.

Taking a paper-making fabric, which is the most demanding of industrial fabrics, as an example, in recent years, with the increase in speed of paper machines, there is a demand for mark suppression based on, in particular, excellent dewatering properties and surface smoothness. The dewatering characteristics required vary depending on the paper machine and the paper product, but uniform dewatering performance is an essential condition for any paper product. In addition, in recent years, the use of waste paper has increased, and insufficient dewatering has been caused by the presence of a large amount of fine fibers mixed together, and sufficient and uniform dewatering has become more important, and it has become more difficult to satisfy the required characteristics of a paper-making fabric. Further, low water retention is required to reduce the amount of water retained in the space of the industrial fabric (hereinafter referred to as "water retention amount") during dewatering.

For example, by making the web thickness thinner, the water retention amount can be reduced. Therefore, a method has been proposed in which the thickness of the net is reduced by simply reducing the diameter of the warp yarns, but in this case, the mesh becomes thick, the rigidity due to the net strength is reduced, and the mesh space is excessively generated, so that the raw material is not left on the fabric and falls off, which causes a reduction in the yield.

Further, a fiber layer (hereinafter, referred to as "initial mat") is formed on the web by dewatering (hereinafter, referred to as "initial dewatering") when the raw material is discharged onto the web.

When the dewatering speed of the web is high, the fibers block the mesh of the web and form a strong initial mat. Since the strong initial mat blocks the mesh of the woven fabric before the completion of the dewatering of the raw material, the subsequent dewatering is incomplete, resulting in poor dewatering, causing deterioration of the paper quality, and the like, and the dewatering performance becomes unstable.

The dewatering speed of a fabric is determined by the influence of the surface, internal space, etc. of the fabric.

In particular, in an industrial fabric having a triple-layer weave structure in which an upper fabric and a lower fabric are bound with binder yarns, the dewatering speed is suppressed by setting the weft density high in order to suppress initial dewatering, but the dewatering performance is more significantly reduced when a strong initial felt is formed.

On the other hand, as a fabric having good dewatering performance, there is an industrial double-layer fabric or the like in which dewatering holes are formed to penetrate from the upper surface side to the lower surface side. In particular, as a fabric for the purpose of satisfying surface properties, fiber support properties, and dewatering properties required for an industrial double layer fabric, an industrial double layer fabric using warp binder yarns woven with upper side weft yarns and lower side weft yarns to form an upper side warp structure and a lower side warp structure is known.

Patent document 1 shows a double-layer fabric using warp binder yarns. In such a conventional double-layer fabric, a part of the warp yarns functions as a binder yarn for knitting the upper surface side layer and the lower surface side layer, and the grouped warp binder yarns complement the upper surface side warp yarn structure and the lower surface side warp yarn structure to form the respective surface structures, so that the fabric is excellent in surface properties and binding strength. However, a part of the weave points of the weave needs to be destroyed to bind, and the weave points need to be supplemented to other warp yarns for the relevant portion. In this case, it is known that since intersections continuously occur between adjacent warp yarns, dewatering resistance occurs, and the occurrence of marks on paper is likely to be caused.

Patent document 2 discloses an industrial double-layer fabric in which a set of top side warp yarns and warp binder yarns is arranged for the purpose of uniform dewatering performance. This fabric is a fabric in which an upper side weave point where upper and lower warp binder yarns are woven is combined with an upper side warp weave point, thereby forming a uniform weave on the surface. In this fabric, the weave of 1 warp is formed on the surface by the 2 warps cooperating with each other, and therefore the weave is not deformed, but one or both of the warps must break the weave of the warp itself, and these form an intersection when they move up and down on the upper and lower surfaces, and the warps are arranged as 1 warp in a set of 2, and the 2 warps are arranged in the horizontal direction without overlapping on the line of 1 warp, so that the warp binder yarn blocks the mesh in the vicinity of the weft inserted on the upper surface, and there is a case where the dewatering characteristics of the line partially change, and a mark is formed on the paper. In addition, the industrial double-layer fabric has good dewatering performance because dewatering holes completely penetrating from the upper surface side layer to the lower surface side layer are arranged on the entire surface, but due to strong vacuum or the like, sheet materials on the threads penetrate into the fabric, or fibers, fillers, and the like are detached, and the generation of dewatering traces is remarkable in some cases.

Further, in the conventional industrial double-layer fabric, in order to improve the dewatering performance, a stack (オンスタック) structure may be adopted, and in this structure, when the warp yarns are formed with different diameters from top to bottom, the surface space becomes excessively large, the space between the warp yarns on the upper surface side is opened, and the space between the warp yarns on the lower surface side is narrowed, so that the control of the dewatering speed is insufficient.

(Prior art document)

(patent document)

Patent document 1: japanese patent laid-open No. 2004-36052

Patent document 2: japanese patent laid-open No. 2004-68168

Disclosure of Invention

(problems to be solved by the invention)

The present invention aims to provide an industrial double-layer fabric which satisfies the basic characteristics of fabrics such as rigidity, abrasion resistance, dewatering property, mark suppression, and low water retention which reduce the water retention amount.

In addition, the invention provides a novel industrial double-layer fabric supporting a high-speed paper machine. That is, in the speeding up of industrial double-layer fabrics, the relationship between the dewatering property and the water retentivity becomes an important factor, and further, it is required to suppress the falling-off of the raw material and to achieve a high yield. Accordingly, the present invention aims to provide an industrial double-layer fabric having improved dewatering properties by improving the mesh openings and the internal space on the upper surface side and the lower surface side, suppressing initial dewatering, increasing the dewatering amount, and the like, and realizing low water retention.

Further, the warp yarn space ratio of the upper fabric and the lower fabric is made to be the same, the difference in space density can be designed arbitrarily by making the yarn diameter of the upper weft yarn and the lower weft yarn different, and therefore, the object is to provide an industrial double-layer fabric in which the dewatering property or water retention property can be adjusted by changing the ratio of the upper weft yarn and the lower weft yarn.

(measures taken to solve the problems)

The industrial double-layer fabric of the invention is characterized in that: the warp knitting machine has a first weave in which the upper surface side warp yarns are arranged in groups of 2 and the warp yarns having a binding function are used for at least one of the groups of 2 warp yarns, and a second weave in which the upper surface side warp yarns are used as a flat yarn, thereby having rigidity and realizing high dewatering performance and low water retention. That is, the present invention adopts the following configuration to solve the above problem.

In order to solve the problems of the prior art described above, the present invention employs the following configuration.

(1) An industrial double-layer fabric, characterized in that: in an upper surface side fabric comprising upper surface side warp yarns and upper surface side weft yarns and an industrial double-layer fabric comprising lower surface side warp yarns and lower surface side weft yarns, the industrial double-layer fabric has at least a first weave comprising a set of 2 upper surface side warp yarns and 1 lower surface side warp yarn and a second weave comprising 1 upper surface side warp yarn and 1 lower surface side warp yarn, the first weave is arranged adjacent to the second weave, the upper surface side warp yarns in the first weave are formed by warp binder yarns having a function of binding the upper surface side fabric and the lower surface side fabric, the upper surface side warp yarns forming the set of 2 upper surface side warp yarns of the first weave are arranged adjacent to each other and form a partial heavy flat weave on the surface of the upper surface side fabric, and the diameter of the lower surface side warp yarns is larger than the diameter of the upper surface side warp yarns forming the first weave, and the upper side warp yarns in the second weave are formed by flat warp yarns.

Here, the double-flat weave means that 2 upper surface side warp yarns are adjacently arranged, and two yarns pass over and under the upper surface side weft yarn to form weave points on the surface of the fabric. In the present invention, the 2 top surface side warp yarns are binder yarns, and some of the warp yarns are not in the heavy flat structure in order to complement each other to exhibit a binding function. By forming the rib weave with 2 upper side warp yarns, a simulation effect as if flat yarns were used can be obtained. Specifically, the shape of the texture spot can be flattened, and surface smoothness and fiber support properties can be improved. Further, by arranging the flat yarns described later adjacent to each other, the effect of the double-layer woven fabric of the ground yarn-bound type can be exerted.

The flat yarn in the present invention is a yarn having a cross-sectional shape other than a circular shape and having substantially flat upper and lower surfaces. The flat yarn of the present invention includes not only rectangular but also elliptical yarns in cross-sectional shape, but also yarns having a width larger than the upper and lower diameters are used. The preferred aspect ratio is 1.1 to 2.0. By using such a flat yarn, the net thickness in the industrial double-layer fabric can be suppressed.

Further, conventionally, the yarn diameter of the yarns constituting the fabric is made thin to suppress the net thickness, but in the case of an industrial double-layer fabric having different upper and lower yarn diameters, the space of the warp yarn on the upper surface side is large relative to the space on the lower surface side, and it is difficult to achieve both the dehydration suppression and the net thickness suppression. In the present invention, the wire thickness is suppressed by the combination of 2 fine warp yarns and flat warp yarns, and therefore the dewatering speed can be controlled.

Further, in the present invention, since the fabric structure is constituted by 2 warp yarns and the warp yarns are bound, at least 1 of the 2 binder yarns has both the fabric structure and the binding structure, and the other 1 paired upper surfaces are constituted in this portion, whereby the effect of minimizing the deformation of the fabric structure in the binding portion can be achieved.

(2) The industrial double-layer fabric according to the above (1), wherein: the diameter of the lower side warp forming the first weave is 130-300% of the diameter of the upper side warp forming the first weave.

Here, when the diameter of the lower side warp is less than 130% of the diameter of the upper side warp, the difference in the diameters between the upper side warp and the lower side warp is small, and there is a risk that the rigidity and the dewatering performance are affected by elongation of the fabric. On the other hand, if the diameter of the lower-side warp exceeds 300% of the diameter of the upper-side warp, the space of the fabric itself becomes small, and there is a risk of causing a problem from the viewpoint of the shrinkage rate.

(3) The industrial double-layer fabric according to the above (1) or (2), wherein: in the second weave, the aspect ratio of the flat warp yarns is 1.1 to 2.0.

In the case where the aspect ratio of the flat warp is less than 1.1, a sufficiently thin net thickness cannot be obtained. On the other hand, if the aspect ratio of the flat warp exceeds 2.0, the flat yarn itself becomes thin, the space of the fabric itself becomes small, the strength of the fabric decreases, and there is a risk that the dewatering performance is affected.

(4) The industrial double-layer fabric according to any one of the above (1) to (3), characterized in that: the industrial double-layer fabric is formed by alternately arranging the first weave and the second weave.

As the yarns constituting the industrial double-layer fabric of the present invention, there are upper side warp yarns which weave with upper side weft yarns, and warp binder yarns which weave with both the upper side weft yarns and the lower side weft yarns, and the upper side warp yarns and the warp binder yarns constitute a group of warp binder yarns arranged vertically. Here, the upper side warp yarns are arranged vertically, but the upper side warp yarns are woven only with the upper side weft yarns, and the warp binder yarns are woven with both the upper side weft yarns and the lower side weft yarns, and therefore, they are not arranged so as to completely overlap each other, and are actually arranged so as to be staggered. In addition to the set of warp binder yarns, a set of upper and lower warp yarns may be arranged, the upper warp yarns being formed by upper side warp yarns that are woven with upper side weft yarns and lower side warp yarns that are woven with lower side weft yarns.

(Effect of the invention)

By adopting the structure of the industrial double-layer fabric of the present invention, the basic characteristics of the fabric, such as rigidity, abrasion resistance, dewatering property, mark suppression, and low water retention that reduces the water retention amount, can be satisfied.

Further, the present invention provides a novel industrial double-layer fabric which supports a high-speed paper machine. The present invention can achieve slow dehydration and low water retention by a warp yarn tying structure having a flat yarn structure by combining flat warp yarns in a warp rib weave, and thus greatly improves the dehydration property and has an excellent effect of low water retention as compared with conventional fabrics.

Further, with the structure of the industrial double-layer fabric according to the present invention, the warp yarn space ratio of the upper surface side fabric and the lower surface side fabric can be made the same, and therefore, the difference in space density can be designed arbitrarily by making the difference in the yarn diameter between the upper surface side weft yarn and the lower surface side weft yarn, and the effect of adjusting the dewatering property and the water retentivity by changing the ratio between the upper surface side weft yarn and the lower surface side weft yarn can be obtained.

Drawings

Fig. 1 is a conceptual diagram for explaining the effect of a fabric having a pattern point shape and a height constituting warp and weft yarns of the present invention. Fig. 1 (a) is a conceptual diagram of conventional warp and weft yarns. Fig. 1 (b) and 1 (c) are conceptual views of warp yarns and weft yarns constituting the present invention.

Fig. 2 is a design diagram showing the entire structure of embodiment 1 of the present invention.

Fig. 3 is a partial side view of arrangement of warp yarns according to embodiment 1 of the present invention as viewed from the side.

Fig. 4 is a design diagram showing the entire structure of embodiment 2 of the present invention.

Fig. 5 is a partial side view of arrangement of warp yarns according to embodiment 2 of the present invention as viewed from the side.

Fig. 6 is a design diagram showing the entire structure of embodiment 3 of the present invention.

Fig. 7 is a partial side view of arrangement of warp yarns according to embodiment 3 of the present invention as viewed from the side.

Fig. 8 is a design diagram showing the entire structure of embodiment 4 of the present invention.

Fig. 9 is a partial side view of arrangement of warp yarns according to embodiment 4 of the present invention as viewed from the side.

Detailed Description

Hereinafter, an embodiment of the industrial double-layer fabric of the present invention will be described. The embodiment described below is an example of the present invention, and does not limit the present invention.

The industrial double-layer fabric of the invention is characterized in that: in an upper surface side fabric comprising upper surface side warp yarns and upper surface side weft yarns and an industrial double-layer fabric comprising lower surface side warp yarns and lower surface side weft yarns, the industrial double-layer fabric has at least a first weave comprising a set of 2 upper surface side warp yarns and 1 lower surface side warp yarn and a second weave comprising 1 upper surface side warp yarn and 1 lower surface side warp yarn, the first weave is arranged adjacent to the second weave, the upper surface side warp yarns in the first weave are formed by warp binder yarns having a function of binding the upper surface side fabric and the lower surface side fabric, the upper surface side warp yarns forming the set of 2 upper surface side warp yarns of the first weave are arranged adjacent to each other and form a partial heavy flat weave on the surface of the upper surface side fabric, and the diameter of the lower surface side warp yarns is larger than the diameter of the upper surface side warp yarns forming the first weave, and the upper side warp yarns in the second weave are formed by flat warp yarns.

The yarn used in the present invention may be selected according to the application, and for example, in addition to a monofilament, a multifilament, a rayon, a processed yarn which is subjected to a crimp processing, a bulk processing, or the like and is generally called a textured yarn, a bulked yarn, an elastic yarn, or a yarn obtained by twisting and combining these yarns may be used. The cross-sectional shape of the yarn other than the flat warp is not limited to a circular shape, and a yarn having a star shape, a rectangular shape, a polygonal shape, an elliptical shape, a hollow shape, or the like may be used. The material of the yarn may be freely selected, and polyester, polyamide, polyphenylene sulfide, polyvinylidene fluoride, polypropylene, aramid, polyether ether ketone, polyethylene naphthalate, polytetrafluoroethylene, cotton, wool, metal, or the like may be used. Of course, copolymers or yarns containing various materials mixed or incorporated in these materials according to the purpose may be used. As an industrial fabric, it is generally preferable to use a polyester monofilament having rigidity and excellent dimensional stability in the upper side warp, the lower warp binder yarn, and the upper side weft. In the lower weft yarn requiring rigidity and abrasion resistance, polyester monofilaments and polyamide monofilaments may be alternately arranged and interlaced.

In the present invention, the warp yarns of one set of 2 yarns in the first weave cooperatively form a rib weave by being juxtaposed. Fig. 1 is a conceptual diagram illustrating the shape and height of a pattern point of warp yarns constituting the present invention. Fig. 1 (a) is a conceptual diagram showing a portion knitted with a conventional warp yarn and a conventional weft yarn. The warp and weft yarn patterns using the yarn diameter in the fabric are conceptual views showing the pattern and height of the weave points. Fig. 1 (b) is a diagram in which the top surface side warp yarns 1t and 2t of one set of 2 in the first weave are arranged below the top surface side weft yarn 1' u. Fig. 1 (c) is a diagram in which the flat warp yarns 3h in the second weave are arranged below the top weft yarns 1' u. The warp yarn used in the first weave in the present invention is characterized in that the yarn diameter of the upper side warp yarn is smaller than that of the lower side warp yarn. Therefore, as shown in fig. 1, the lengthwise lengths L2, L3 of the stitch point shape formed by the top side warp yarns 1t, 2t and the flat warp yarn 3h are smaller than the lengthwise length L1 of the stitch point shape formed by the conventional yarn having a yarn diameter.

Therefore, the industrial double-layer fabric of the present invention can form the weave point shape on the upper weave side more smoothly than the conventional industrial double-layer fabric, and therefore can obtain a fabric in which the net thickness is suppressed. In addition, since the weft yarn into which 2 warps and flat warps are woven has a flat weave point shape, surface smoothness and fiber support properties can be improved. Further, since the mesh size can be adjusted to be small without increasing the thickness, dewatering characteristics which have not been available in the past can be provided.

Further, since the present invention has a structure in which the weave structure is constituted by 2 warp yarns and bound, one of a set of 2 binder yarns has both a weave structure and a binding weave structure, and the other yarn constituting the upper surface side can suppress the deformation of the weave structure at the bound portion to the minimum.

In the industrial double-layer fabric of the present invention, the upper side warp yarns may have the same diameter. The bottom surface side warp yarns may have the same diameter. Further, the diameter of the lower face side warp may be 130 to 300% of the diameter of the upper face side warp. With this configuration, since the upper fabric and the lower fabric can be bound by a single side yarn of a double-layer weave composed of 2 finer warp yarns, the diameter of the upper and lower binder yarns in the fabric can be made finer than the diameter of the warp binder yarns in the industrial double-layer fabric using the conventional warp binder yarns. Therefore, the occurrence of local dewatering unevenness can be suppressed to the minimum. Further, conventionally, the wire thickness is controlled by making the yarn diameter of the yarns forming the fabric finer, but in the case of an industrial double-layer fabric having different upper and lower yarn diameters, the space of the warp yarn on the upper surface side is larger than that on the lower surface side, and it is difficult to achieve both the dehydration suppression and the wire thickness suppression. The invention can adjust dehydration speed under the state of inhibiting the thickness of the net by combining 2 thin warps and flat warps.

In the present invention, a yarn having a smaller diameter of the top side warp yarn composed of 2 sets constituting the first weave than that of the top side warp yarn composed of 1 set constituting the second weave may be used. By making the thread diameter of the upper surface side warp yarn composed of 2 sets constituting the first weave, the force applied to the weft yarn at the time of formation of the weave point can be made to be the same as that of 1 set, and surface smoothness, fiber support property, and the like can be improved. Further, the wire diameter can be adjusted by selecting the wire diameter together with the wire rod, and therefore the wire diameter and the wire rod can be appropriately selected.

In the present invention, a stack structure may be employed. By adopting the stack structure, high dewatering performance can be obtained, and on the other hand, since the surface texture is a heavy flat texture, the vertical holes can be appropriately closed by 2 yarns, and an excessive difference in the mesh openings on the upper surface side and the lower surface side can be suppressed, so that the dewatering speed can be controlled.

Next, an embodiment of the industrial double-layer fabric according to the present invention will be described with reference to the drawings. Fig. 2 to 9 are design drawings and partial side view arrangements showing an example of the industrial double-layer fabric of the present invention. The design pattern is the smallest repeating unit of the weave, and the complete weave is connected up, down, left, and right to form the weave of the entire fabric. In the design drawings, the warp yarns are represented by arabic numerals, e.g., 1, 2, 3 …. The weft yarns are designated by primed arabic numerals, e.g., 1 ', 2 ', 3 ' …. The binder yarns are the top side warp yarns that make up the first weave. In addition, the x mark indicates that one upper side warp yarn constituting the first weave is positioned above the upper side weft yarn, the Δ mark indicates that the upper side warp yarn is positioned below the lower side weft yarn, and the o mark indicates that the lower side warp yarn is positioned below the lower side weft yarn. The upper and lower side warp yarns and the upper and lower side weft yarns are arranged vertically. In the design drawing, the yarns are arranged to overlap each other vertically accurately, or the lower face side warp is arranged at a middle point between 2 upper face side warps, but this is for convenience of illustration, and the yarns may be arranged to be slightly shifted in the actual fabric.

Embodiment mode 1

Fig. 2 is a design view of embodiment 1 of the industrial double-layer fabric of the present invention. Fig. 3 is a partial side view of embodiment 1 of the industrial double-layer fabric of the present invention. The first weave of embodiment 1 is composed of 2 sets of upper face side warp yarns and 1 lower face side warp yarn. The top side warp yarns in the first weave are formed by warp binder yarns that function to bind the top side fabric to the bottom side fabric. Further, the top side warp yarns of one set of 2 yarns forming the first weave are adjacently arranged and constitute a local uneven weave on the surface of the top side fabric. The second weave is formed by 1 upper surface side warp yarn and 1 lower surface side warp yarn. The upper side warp yarns in the second weave are formed by flat warp yarns. As shown in fig. 2, the first tissues 1, 3, and 5 are arranged adjacent to the second tissues 2, 4, and 6 alternately. Further, the lower side warp yarns have a larger diameter than the upper side warp yarns forming the first weave.

Specifically, as shown in fig. 2 and 3, one upper side warp yarn 1 in the first weave pattern passes through the lower side of the lower side weft yarn 1 'and passes through the upper side of the upper side weft yarns 5', 7 ', 9', 11 ', 13', 15 ', 17', 19 ', 21'. And the other upper side warp yarn 1 in the first weave pattern becomes a weave passing through the upper side of the upper side weft yarns 1 ', 3', 5 ', 7', 9 ', and passing through the lower side of the lower side weft yarn 13', and further passing through the upper side of the upper side weft yarns 17 ', 19', 21 ', 23'. The lower side warp yarn 1 passes under the lower side weft yarns 1 ', 13'. Thus, as shown in fig. 3, the top side warp yarns 1 of the 2-warp set in the first weave constitute a local rib weave on the top fabric surface at the top side weft yarns 5 ', 7', 9 'and 17', 19 ', 21'. The upper side warp yarn 2 as flat warp yarn in the second weave then passes over the upper side of the upper side weft yarns 2 ', 4', 6 ', 8', 10 ', 12', 14 ', 16', 18 ', 20', 22 ', 24' to form a plain weave. The lower side warp yarn 2 in the second weave passes under the lower side weft yarns 3 ', 15'.

The first weave of the industrial double-layer fabric according to embodiment 1 can form a pseudo-flat yarn by forming a double-layer weave by arranging 2 fine upper-face side warps in parallel on a part of the surface of the upper-face side fabric. Further, by arranging the flat warp yarns in the second weave adjacent to the first weave, as in the case of a fabric having a surface weave formed by using only flat yarns, it is possible to suppress the thickness and ensure appropriate rigidity and stretch resistance, and it is possible to provide a fabric having excellent abrasion resistance, appropriate dewatering properties, low water retention, and surface smoothness.

Further, since the mesh size can be reduced while suppressing the thickness of the fabric by adopting the fabric structure of embodiment 1, the dewatering property and the water retention property can be adjusted by selecting the yarn diameter of the yarn.

Further, since the weave point shape of the weft yarn can be made flat by the 2-ply rib weave, the surface smoothness and the fiber support property can be improved.

Embodiment mode 2

Fig. 4 is a design view of embodiment 1 of the industrial double-layer fabric of the present invention. Fig. 5 is a partial side view of embodiment 2 of the industrial double-layer fabric of the present invention. The first weave of embodiment 2 is composed of 2 sets of upper face side warp yarns and 1 lower face side warp yarn. The top side warp yarns in the first weave are formed by warp binder yarns that function to bind the top side fabric to the bottom side fabric. Further, the top side warp yarns of one set of 2 yarns forming the first weave are adjacently arranged and constitute a local uneven weave on the surface of the top side fabric. The second weave is formed by 1 upper surface side warp yarn and 1 lower surface side warp yarn. The upper side warp yarns in the second weave are formed by flat warp yarns. As shown in fig. 4, the first tissues 1, 3, and 5 are arranged adjacent to the second tissues 2, 4, and 6 alternately. Further, the lower side warp yarns have a larger diameter than the upper side warp yarns forming the first weave.

Specifically, as shown in fig. 4 and 5, one upper side warp yarn 1 in the first weave pattern passes through the upper sides of the upper side weft yarns 1 ', 3', 5 ', 7', passes through the lower side of the lower side weft yarn 10 ', and then passes through the upper sides of the upper side weft yarns 13', 15 ', 17'. And the other upper side warp yarn 1 in the first weave pattern becomes a weave pattern passing through the lower side of the lower side weft yarn 1 ' and passing through the upper side of the upper side weft yarns 3 ', 5 ', 7 ', 9 ', 11 ', 13 ', 15 ', 17 '. The lower side warp yarn 1 passes under the lower side weft yarns 1 ', 10'. Thus, as shown in FIG. 5, the top side warp yarns 1 of the 2-warp set in the first weave pattern form a partially flattened weave in the top side weft yarns 3 ', 5', 7 'and 13', 15 ', 17' on the top side fabric surface.

The upper side warp yarn 2 as flat warp yarn in the second weave then passes over the upper side of the upper side weft yarns 2 ', 4 ', 6 ', 8 ', 10 ', 12 ', 14 ', 16 ', 18 ' to form a plain weave. The lower side warp yarn 2 in the second weave passes under the lower side weft yarns 2 ', 11'.

The first weave of the industrial double-layer fabric according to embodiment 2 can form a pseudo-flat yarn by forming a double-layer weave by arranging 2 fine upper-side warp yarns in parallel on a part of the surface of the upper-side fabric. Further, by arranging the flat warp yarns in the second weave adjacent to the first weave, as in the case of a fabric in which the surface weave is formed using only flat yarns, it is possible to suppress the thickness and ensure appropriate rigidity and stretch resistance, and it is possible to provide a fabric excellent in abrasion resistance, appropriate dewatering properties, and surface smoothness.

Further, by adopting the fabric structure of embodiment 2, the dewatering characteristics can be adjusted by selecting the yarn diameter of the yarn because the mesh can be reduced while suppressing the thickness of the fabric.

Further, since the weave point shape of the weft yarn can be made flat by the 2-ply rib weave, the surface smoothness and the fiber support property can be improved.

Embodiment 3

Fig. 6 is a design view of embodiment 3 of the industrial double-layer fabric of the present invention. Fig. 7 is a partial side view of embodiment 3 of the industrial double-layer fabric of the present invention. The first weave of embodiment 3 is composed of 2 sets of upper face side warp yarns and 1 lower face side warp yarn. The top side warp yarns in the first weave are formed by warp binder yarns that function to bind the top side fabric to the bottom side fabric. Further, the top side warp yarns of one set of 2 yarns forming the first weave are adjacently arranged and constitute a local uneven weave on the surface of the top side fabric. The second weave is formed by 1 upper surface side warp yarn and 1 lower surface side warp yarn. The upper side warp yarns in the second weave are formed by flat warp yarns. As shown in fig. 6, the first tissues 1, 3, and 5 are arranged adjacent to the second tissues 2, 4, and 6 alternately. Further, the diameter of the lower face side warp is formed larger than the diameter of the upper face side warp forming the first weave.

Specifically, as shown in fig. 6 and 7, one upper side warp yarn 1 in the first weave pattern passes through the upper sides of the upper side weft yarns 1 ', 3', 5 ', and 7', passes through the lower side of the lower side weft yarn 10 ', and then passes through the upper sides of the upper side weft yarns 13', 15 ', and 17'. The lower side warp yarn 1 passes under the lower side weft yarns 1 ', 10'. And the other upper side warp yarn 1 in the first weave pattern becomes a weave passing through the lower side of the lower side weft yarn 1 ' and passing through the upper side of the upper side weft yarns 5 ', 7 ', 9 ', 11 ', 13 ', 15 '. Thus, as shown in fig. 7, the top warp yarn 1 of one set of 2 yarns in the first weave constitutes a partially flattened weave on the top fabric surface at the top weft yarns 5 ', 7' and 13 ', 15'.

The upper side warp yarn 2 as flat warp yarn in the second weave then passes over the upper side of the upper side weft yarns 2 ', 4 ', 6 ', 8 ', 10 ', 12 ', 14 ', 16 ', 18 ' to form a plain weave. The lower side warp yarn 2 in the second weave passes under the lower side weft yarns 2 ', 11'.

The first weave of the industrial double-layer fabric according to embodiment 3 can form a pseudo-flat yarn by forming a double-layer weave by arranging 2 fine upper-face side warps in parallel on a part of the surface of the upper-face side fabric. Further, by arranging the flat warp yarns in the second weave adjacent to the first weave, as in the case of a fabric in which the surface weave is formed using only flat yarns, it is possible to suppress the thickness and ensure appropriate rigidity and stretch resistance, and it is possible to provide a fabric excellent in abrasion resistance, appropriate dewatering properties, and surface smoothness.

Further, by adopting the fabric structure of embodiment 3, the dewatering characteristics can be adjusted by selecting the yarn diameter of the yarn because the mesh can be reduced while suppressing the thickness of the fabric.

Further, since the weave point shape of the weft yarn can be made flat by the 2-ply rib weave, the surface smoothness and the fiber support property can be improved.

Embodiment 4

Fig. 8 is a design diagram of embodiment 4 of the industrial double-layer fabric of the present invention. Fig. 9 is a partial side view layout view of embodiment 4 of the industrial double-layer fabric of the present invention. The first weave of embodiment 4 is composed of 2 sets of upper face side warp yarns and 1 lower face side warp yarn. The top side warp yarns in the first weave are formed by warp binder yarns that function to bind the top side fabric to the bottom side fabric. Further, the top side warp yarns of one set of 2 yarns forming the first weave are adjacently arranged and constitute a local uneven weave on the surface of the top side fabric. The second weave is formed by 1 upper surface side warp yarn and 1 lower surface side warp yarn. The upper side warp yarns in the second weave are formed by flat warp yarns. As shown in fig. 8, the first tissue 1 is configured to be disposed adjacent to the second tissues 2 and 8, and the first tissue 5 is configured to be disposed adjacent to the second tissues 4 and 6. Further, the lower side warp yarns are formed to have a larger diameter than the upper side warp yarns forming the first weave.

Specifically, as shown in fig. 8 and 9, one upper side warp yarn 1 in the first weave pattern passes through the upper sides of the upper side weft yarns 1 ', 3 ', 5 ', 7 ', 9 ', 11 ', passes through the lower side of the lower side weft yarn 13 ', and then passes through the upper sides of the upper side weft yarns 15 ', 17 '. The lower side warp yarn 1 passes through the lower side of the lower side weft yarns 1 ', 7 ', 13 '. And the other upper side warp yarn 1 in the first weave pattern becomes a weave pattern passing through the lower side of the lower side weft yarn 1 ' and passing through the upper side of the upper side weft yarns 3 ', 5 ', 7 ', 9 ', 11 ', 13 ', 15 ', 17 '. Thus, as shown in fig. 9, the top side warp yarns 1 of the 2-warp set in the first weave constitute a partial rib weave on the top side fabric surface at the top side weft yarns 3 ', 5 ', 7 ', 9 ', 11 ' and 15 ', 17 '.

Next, the upper side warp yarn 2 as a flat warp yarn in the second weave passes through the upper sides of the upper side weft yarns 2 ', 4 ', 6 ', 8 ', 10 ', 12 ', 14 ', 16 ', 18 ' to form a plain weave. The lower side warp yarn 2 in the second weave passes under the lower side weft yarns 2 ', 8 ', 14 '.

Next, the upper side warp 3 as a flat warp in the second weave passes through the upper side of the upper side wefts 1 ', 3 ', 5 ', 7 ', 9 ', 11 ', 13 ', 15 ', 17 ' to form a plain weave. The lower side warp yarn 3 in the second weave passes under the lower side weft yarns 4 ', 10 ', 16 '.

The upper side warp yarn 4 as flat warp yarn in the second weave then passes over the upper side of the upper side weft yarns 2 ', 4 ', 6 ', 8 ', 10 ', 12 ', 14 ', 16 ', 18 ' to form a plain weave. The lower side warp yarn 4 in the second weave passes under the lower side weft yarns 5 ', 11 ', 17 '.

The first weave of the industrial double-layer fabric according to embodiment 4 can form a pseudo flat yarn by forming a double weave by arranging 2 fine upper-side warp yarns in parallel on a part of the surface of the upper-side fabric. Further, by arranging the flat warp yarns in the second weave adjacent to the first weave, as in the case of a fabric in which the surface weave is formed using only flat yarns, it is possible to suppress the thickness and ensure appropriate rigidity and stretch resistance, and it is possible to provide a fabric excellent in abrasion resistance, appropriate dewatering properties, and surface smoothness.

Further, by adopting the fabric structure of embodiment 4, the dewatering characteristics can be adjusted by selecting the yarn diameter of the yarn because the mesh can be reduced while suppressing the thickness of the fabric.

Further, since the weave point shape of the weft yarn can be made flat by the 2-ply rib weave, the surface smoothness and the fiber support property can be improved.

(description of reference numerals)

1-8: warp yarns; 1 'to 24': and (4) weft yarns.