JP6433229B2 - Seam felt for papermaking and method for producing the same - Google Patents

Description

  The present invention relates to a papermaking seam felt used in a press part for squeezing moisture from wet paper in a papermaking machine, and a method for producing the same.

  In a press part of a papermaking machine, an endless papermaking felt having a base fabric and a bat fiber layer laminated and integrated with the base fabric is used for transporting and squeezing wet paper. Some endless papermaking felts are formed endless from the beginning using a base fabric woven endlessly by bag weaving. Such a paper felt has the advantage that the structure is uniform in each part, so that it is difficult to generate transfer marks. However, a large loom is required to weave the base fabric, and the paper felt is applied to the paper machine. There is a disadvantage that putting work takes time.

  As a papermaking felt, there is a papermaking seam felt that has a flat plate shape and includes loops of a plurality of warps at both ends in the length direction (for example, Patent Document 1). Such a papermaking seam felt is inserted into a paper machine in a flat state, and then loops at both ends are aligned with each other, and a common core wire is inserted into each loop to be connected endlessly. For this reason, it is easy to carry it over the paper machine. The loop of the papermaking seam felt can be formed by a loom when the base fabric is woven. However, the base fabric provided with loops from the time of weaving has a complicated structure and increases costs. Further, when such a base fabric is formed by a loom, a relatively large loom is required.

  As a method for easily producing a seam felt for papermaking, a base fabric woven in a flat plate shape is folded at two folded portions extending in the width direction, and the wefts of each folded portion are removed, so that both ends in the length direction are removed. There is a method of forming a loop of a plurality of warps (for example, Patent Document 2). Such a seam felt for papermaking has an advantage that a base fabric can be woven by a small loom.

  When the papermaking seam felt is used in a portion where the amount of dewatering from the wet paper is large, such as a press part such as white board papermaking or pulp papermaking or a shoe press part, it is preferable that the void volume is large. In order to increase the void volume of the seam felt for papermaking, there are methods such as increasing the basis weight of the base fabric and making the yarn constituting the base fabric a monofilament with a large diameter. There is a limit from the viewpoint. As another method, there is a method of increasing the thickness of the base fabric and increasing the void volume. For example, there are a method of forming a base fabric by stacking two base fabrics having seams at both ends in the length direction (so-called laminate seam), a method of weaving the base fabric by triple weaving (so-called triple weaving seam), etc. is there. However, the laminate seam and the triple woven seam have a problem that the structure of the base fabric is complicated and the manufacturing cost is high.

  As a papermaking seam felt having a relatively simple structure and an increased thickness of the base fabric, one inner base fabric is formed on the inner side of the outer base fabric that is flattened by folding at two folding portions extending in the width direction. There is one in which the base fabric is arranged in a three-layer structure (for example, Patent Document 3). In the papermaking seam felt, the inner base fabric and the outer base fabric have loops formed by warps at both ends in the length direction. The loops of the inner base fabric are disposed so as to pass between the loops of the outer base fabric and protrude outward, and function as a coupling loop for forming a seam.

JP 2004-149986 A Japanese Patent No. 2838547 JP 2000-80584 A

  In the seam felt for papermaking according to Patent Document 2, in order to allow the loop of the inner base fabric to pass through the loop of the outer base fabric, at least the interval between the warps of the inner base fabric and the outer base fabric must be matched, There exists a problem that the structure of an inner side base fabric and an outer side base fabric cannot be selected freely. Further, the inner base fabric and the outer base fabric are required to have high dimensional accuracy in the length method. In addition, there is a problem that a loop must be formed on both the outer base fabric and the inner base fabric, resulting in a large number of manufacturing steps.

  In view of the above background, it is an object of the present invention to realize a papermaking seam felt having a thickness with a simple configuration. Another object of the present invention is to provide a simple method for producing a papermaking seam felt having a thickness.

  In order to solve the above-mentioned problems, the present invention provides a papermaking seam felt (1) in which a woven fabric including a warp yarn (7A) extending in the length direction and a weft yarn (7B) extending in the width direction is a flat plate. The outer bent portions (7C) extending in the width direction are formed at both ends in the length direction by being folded in a shape, and the seam loop (4) made of warp is formed in each of the outer bent portions. The base fabric (7) and the woven fabric including the warp (8A) and the weft (8B) are folded into a flat plate shape, thereby forming inner bent portions (8C) extending in the width direction at both ends in the length direction, An inner base fabric (8) disposed inside the outer base fabric, and a batt fiber layer (3) bonded to the outer base fabric and a base fabric (2) including the inner base fabric, Each of the inner bent portions has a corresponding outer bent portion. Characterized in that it is arranged inside the Rimotake direction.

  According to this configuration, the void volume of the papermaking seam felt can be increased with a simple configuration. In addition, since the outer base fabric forms a seam loop and the inner base fabric is arranged inside the outer base fabric, the seam loop is appropriate regardless of the length dimension of the outer base fabric and the inner base fabric. Formed. In addition, the woven structure of the inner base fabric and the outer base fabric, the structure of the yarn (monofilament, multifilament, and twisted yarns thereof), the material of the yarn, the yarn diameter, the yarn density, etc. can be freely set with each other. it can. In addition, since the warp loop structure is arranged at both ends in the length direction of the inner base fabric, instead of the free ends (ends) of the warp, the warp is pierced by the needle needle when needing the bat fiber layer. The warp and the weft are prevented from being unwound and the warp and the weft are unwound as the warp shrinks during heat setting. In addition, since the end in the length direction of the inner base fabric is the inner bent portion and the warp does not form a free end, when inserting the inner yarn into the inner bent portion, It becomes difficult for the thread to be caught and the thread can be easily inserted.

  In the above invention, a yarn (11) extending in the width direction may be disposed inside the outer bent portion and outside the inner bent portion.

  According to this configuration, since the warp yarn (filling yarn) is arranged, the bat fiber layer can be entangled with the warp yarn, so that the bonding property between the seam loop vicinity of the base fabric and the bat fiber layer is improved. . In particular, in the base fabric in which the inner base fabric is interposed inside the outer base fabric forming the seam loop as in the present invention, the seam loop becomes large, and the bondability with the bat fiber layer decreases. It is effective to dispose the warp yarn in the vicinity of the seam loop and bond the batt fiber layer to the warp yarn.

  In the above invention, it is preferable that the warp includes at least one of a monofilament twisted yarn and a multifilament.

  According to this configuration, the bondability between the warp yarn and the batt fiber layer is improved.

  In the above invention, the configuration of the outer base fabric and the configuration of the inner base fabric may be different from each other.

  According to this configuration, the degree of freedom in selecting the characteristics that can be realized by the base fabric is improved. For example, a single configuration that increases the thread diameter of the outer base fabric forming the seam loop to ensure durability while reducing the thread diameter of the inner base fabric to improve the bondability with the bat fiber layer, etc. Characteristics that are difficult to realize with this base fabric can be realized on the base fabric. In addition, because the configuration of the outer base fabric and the inner base fabric is different, the unevenness on the surface of the outer base fabric and the unevenness on the surface of the inner base fabric cannot be fitted to each other, and the gap caused by the unevenness is maintained, The void volume of the base fabric increases.

  In the above invention, the warp and the weft of the outer base fabric include a monofilament, the warp of the inner base fabric includes at least one of a monofilament and a monofilament twisted yarn, and the weft of the inner base fabric includes a monofilament. Good.

  According to this configuration, the durability and void volume of the base fabric are enhanced by the outer base fabric, while the bondability between the base fabric and the batt fiber layer is enhanced by the inner base fabric.

  In the above invention, the yarn density of the inner base fabric is preferably higher than the yarn density of the outer base fabric. Here, the yarn density refers to the number of yarns per unit length. When warp yarns extend in the length direction and weft yarns extend in the width direction, the warp density means the number of warp yarns per unit length (for example, 1 inch) in the width direction, and the weft density is the unit in the length direction. The number of wefts per length (for example, 1 inch).

  According to this configuration, the outer base fabric increases the void volume of the base fabric, while the inner base fabric increases the bondability with the batt fiber layer of the base fabric.

  Another aspect of the present invention is a method for producing a papermaking seam felt (1), comprising a woven fabric including warp yarns (7A) extending in the length direction and weft yarns (7B) extending in the width direction. The outer base fabric (7) to be configured is folded into a flat plate shape, and the outer folds (7C) extending in the width direction are formed at both ends in the length direction, respectively, and the weave including the warp (8A) and the weft (8B) A step of folding the inner base fabric (8) made of cloth into a flat plate shape and forming inner bent portions (8C) extending in the width direction at both ends in the length direction, and the inner side of the folded outer base fabric A step of forming the base fabric (2) in which the inner base fabric folded and the outer base fabric and the inner base fabric are laminated, and a seam made of warp by removing the weft from the outer bent portion By forming the loop (4) and needling. Characterized by a step of coupling a batt fiber layer on the base fabric Te.

  According to this configuration, since the folded inner base fabric is disposed inside the folded outer base fabric and the seam loop is formed by the outer base fabric, the outer base fabric and the inner base fabric do not require high dimensional accuracy. Easy to manufacture.

  In the above invention, the seam loop is formed on the miscellaneous fabric (20) between the step of forming the base fabric on which the outer base fabric and the inner base fabric are laminated and the step of performing the needling. It is preferable to further include a step of inserting a common core wire (25) into the loop for seam and the loop of the cloth.

  According to this configuration, when performing the needling, each seam loop is coupled with the loop of the cloth and the position is fixed, so that it is possible to resist the warp tension accompanying the needling, and for the seam The shape of the loop is maintained. In addition, the seam loops at both ends of the base fabric are not connected to each other, but the seam loops are connected to the miscellaneous cloth, so that the needling can be performed while the papermaking seam felt remains flat.

  In the above invention, between the step of inserting the core wire through the seam loop and the coupling loop and the step of performing the needling, the inner bent portion is inside the outer bent portion. It is preferable to further include a step of inserting an end yarn in the width direction outside the connecting loop and outside the coupling loop.

  According to this configuration, the yarn can be disposed when improving the bondability of the bat fiber layer to the base fabric inside the outer bent portion and outside the inner bent portion. Since the connecting loop and the core wire are attached to the seam loop when inserting the boundary yarn, the space for passing the core wire is prevented from being filled with the boundary yarn.

  According to the above configuration, a papermaking seam felt having a thickness can be realized with a simple configuration. Moreover, the simple manufacturing method of the seam felt for paper manufacture which has thickness can be provided.

The perspective view which shows the seam felt for paper manufacture which concerns on embodiment Sectional drawing which shows the seam felt for paper manufacture which concerns on embodiment Explanatory drawing which shows the manufacture procedure of the seam felt for paper manufacture which concerns on (A)-(C) embodiment. (D)-(H) Explanatory drawing which shows the manufacture procedure of the seam felt for paper manufacture which concerns on embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A papermaking seam felt 1 according to the following embodiment is used as a conveying means for transporting wet paper in a papermaking machine, and is used for a pressure dehydration step of wet paper.

  As shown in FIGS. 1 and 2, a papermaking seam felt 1 is obtained by laminating and integrating a bat fiber layer 3 on a base fabric 2 by needling. The base fabric 2 has ends in the length direction and has seam loops 4 at each end in the length direction. The papermaking seam felt 1 has a flat plate shape when the seam loops 4 are separated from each other (see FIG. 1), and has an endless annular shape when the seam loops 4 are connected to each other by a core wire 5 (see FIG. 1). (See FIG. 2). The papermaking seam felt 1 is put into a papermaking machine in the form of a flat plate, and then the seam loops 4 are connected to each other via a core wire 5 to be used in an endless annular form.

  The base fabric 2 includes an outer base fabric 7 and an inner base fabric 8 that are laminated with each other. The outer base fabric 7 and the inner base fabric 8 are each formed as a woven fabric in which warp yarns 7A and 8A extending in the length direction and weft yarns 7B and 8B extending in the width direction are woven together. The outer base fabric 7 and the inner base fabric 8 are formed in a flat plate shape (band shape) having end portions 7D and 8D in the length direction and the width direction, respectively, and the length direction is formed longer than the width direction.

  Arbitrary configurations can be applied to the outer base fabric 7 and the inner base fabric 8. The configuration of the outer base fabric 7 and the inner base fabric 8 includes a woven structure, structures (shapes) of warps 7A, 8A and wefts 7B, 8B, material, thickness, thread density (unit length in the width direction (for example, 1 inch). ), The number of warps 7A, 8A per unit, the number of wefts 7B, 8B per unit length (for example, 1 inch) in the length direction, and the basis weight.

  As the warp yarns 7A, 8A and the weft yarns 7B, 8B, known yarns such as monofilaments, monofilament twisted yarns and core-sheath fibers can be applied, and the material thereof is, for example, polyamide, polyester, polyethylene, polypropylene, polyvinyl chloride, etc. It may be a resin. For example, when a monofilament is used, the void volume of the base fabric 2 can be increased and the durability of the base fabric 2 can be improved. Further, when a monofilament twisted yarn or a core-sheath fiber is used, the bondability with the batt fiber layer 3 can be enhanced.

  The configurations of the outer base fabric 7 and the inner base fabric 8 may be the same as or different from each other. For example, it is preferable that the outer base fabric 7 has a higher durability than the inner base fabric 8 because the warp 7A forms the seam loop 4 as described later. Therefore, the outer base fabric 7 is preferably formed from a highly durable yarn. For example, the warp yarn 7A and the weft yarn 7B of the outer base fabric 7 are preferably monofilaments in order to increase durability. Moreover, it is preferable that the inner base fabric 8 is applied with a structure having higher bonding properties with the batt fiber layer 3 than the outer base fabric 7. In order to enhance the bondability with the batt fiber layer 3, the inner base fabric 8 preferably includes, for example, at least one of the warp yarn 7A and the weft yarn 7B including a monofilament twisted yarn. The yarn density of the warp 8A and the weft 8B of the inner base fabric 8 is preferably higher than the yarn density of the warp 7A and the weft 7B of the outer base fabric 7. The warp yarns 7A and the weft yarns 7B of the outer base fabric 7 are preferably thicker (larger in diameter) than the warp yarns 8A and the weft yarns 8B of the inner base fabric 8 from the viewpoint of durability. In this embodiment, the warp 7A and the weft 7B of the outer base fabric 7 are made of monofilament, the warp 8A of the inner base fabric 8 is made of monofilament or monofilament twisted yarn, and the weft 8B is made of monofilament.

  The outer base fabric 7 and the inner base fabric 8 have a known woven structure such as a plain structure (plain weave) or a twill structure (twill weave). In the present embodiment, the outer base fabric 7 and the inner base fabric 8 have a flat structure.

  The outer base fabric 7 is folded at two locations in the height direction of the outer base fabric 7 so that the folds extend in the width direction, and two outer bent portions 7C extending in the width direction are formed. . The outer base fabric 7 has a structure in which two layers are stacked in the thickness direction by being folded. The folded outer base fabric 7 is formed in a flat plate shape whose length direction is long with respect to the width direction, and the two outer bent portions 7C form both ends of the folded outer base fabric 7 in the height direction. The outer base fabric 7 is bent to one surface side (the same surface side) of the outer base fabric 7 at the two outer bent portions 7C.

  The distance between the end portions in the height direction of the two outer bent portions 7C is approximately ½ of the length in the height direction when the outer base fabric 7 is spread in one layer. Therefore, the pair of end portions 7D in the height direction of the outer base cloth 7 in the deployed form are arranged close to each other in a form in which the outer base cloth 7 is folded. The outer base fabric 7 may be formed in an annular shape by joining both end portions 7D in the length direction to each other. The joining of both end portions 7D may be performed by welding the both end portions 7D or by weaving the both end portions 7D together.

  The inner base fabric 8 is folded at two locations in the length direction of the inner base fabric 8 so that the folds extend in the width direction, and two inner bent portions 8C extending in the width direction are formed. . The inner base fabric 8 has a structure in which two layers are laminated in the thickness direction by being folded. The folded inner base fabric 8 is formed in a flat plate shape whose length direction is long with respect to the width direction, and the two inner bent portions 8C form both ends of the folded inner base fabric 8 in the height direction. In this embodiment, the inner base fabric 8 is bent to one surface side (the same surface side) of the inner base fabric 8 at the two inner bent portions 8C.

  The distance in the length direction of the two inner bent portions 8C is approximately ½ of the length in the height direction when the inner base fabric 8 is developed in one layer. Therefore, the pair of end portions 8D in the height direction of the inner base fabric 8 in the deployed form are arranged close to each other in the length direction in a form in which the inner base fabric 8 is folded. The inner base fabric 8 may be formed in an annular shape by joining both end portions 8D in the length direction to each other. The joining of both end portions 8D may be performed by welding the both end portions 8D or by weaving the both end portions 8D together.

  In another embodiment, the inner base fabric 8 may be folded so that the pair of inner bent portions 8C is inclined with respect to the extending direction of the weft yarn 8B (the direction orthogonal to the warp yarn 8A). In the inner base fabric 8 that is inclined and folded in this manner, the extending direction of the inner bent portion 8C is the width direction, and the direction orthogonal to the extending direction of the inner bent portion 8C is the length direction. When folded in this way, the side edges in the width direction of the inner base fabric 8 are inclined, so that the side edges are formed along the length direction by cutting the side edges. Accordingly, the inner base fabric 8 that is inclined and folded has a rectangular shape in which the long side extends in the length direction and the short side extends in the width direction. In the inner base fabric 8 that is inclined and folded, the warp 8A is inclined with respect to the length direction, and the weft 8B is inclined with respect to the width direction.

  The length of the folded inner base fabric 8 in the length direction is shorter than the length of the folded outer base fabric 7 in the height direction. Thereby, it becomes possible to arrange the inner base fabric 8 inside the folded outer base fabric 7. The outer base fabric of the inner base fabric 8 is arranged such that each of the inner bent portions 8C is arranged on the inner side (center side in the length direction) of the outer base fabric 7 than the corresponding outer bent portion 7C in the length direction. A position relative to 7 is determined.

  In a state in which the folded inner base fabric 8 is arranged inside the folded outer base fabric 7, both end portions 7D of the outer base fabric 7 and both end portions 8D of the inner base fabric 8 are offset in the length direction. It is preferable.

  The base fabric 2 is configured such that the inner base fabric 8 folded inside the folded outer base fabric 7 is disposed, whereby two layers of the outer base fabric 7 and two layers of the inner base fabric 8 are laminated in the thickness direction. , A total of four layers. In the present embodiment, the layer including both end portions 7D of the outer base fabric 7 and the layer including both end portions 8D of the inner base fabric 8 are arranged adjacent to each other. However, in other embodiments, the outer base fabric 7 is disposed. A layer that does not include both end portions 8 </ b> D of the inner base fabric 8 may be disposed between the layer that includes both end portions 7 </ b> D and the layer that includes both end portions 8 </ b> D of the inner base fabric 8.

  At each outer bent portion 7C, a plurality of wefts 7B are extracted, and each warp 7A is exposed to the outside. Each warp 7 </ b> A in the outer bent portion 7 </ b> C is bent to have a U-shape and constitute a seam loop 4. Each seam loop 4 forms a loop hole that opens in the width direction on the inner side. In one outer bent portion 7C, the seam loops 4 are arranged at equal intervals in the width direction, and the respective loop holes are arranged so as to be aligned with each other when viewed from the width direction. Form. Similarly, in the other outer bent portion 7C, the seam loops 4 are arranged at equal intervals in the width direction, and the respective loop holes are arranged so as to be aligned with each other when viewed from the width direction. A loop row 4B is formed.

  When the papermaking seam felt 1 is formed into an annular shape, the seam loop row 4A of one outer bent portion 7C and the seam loop row 4B of the other outer bent portion 7C are engaged with each other. In a state where the seam loop rows 4A and 4B are engaged with each other, the seam loop 4 of the seam loop row 4A and the seam loop 4 of the seam loop row 4B appear alternately in the width direction, and each loop The holes align with each other when viewed from the width direction. In this state, a common core wire 5 extending in the width direction is inserted into all the seam loops 4 so that the outer bent portions 7C are coupled to each other. For the core wire 5, known yarns such as monofilaments, monofilament twisted yarns, multifilaments, and core-sheath fibers can be applied. The material of the core wire 5 is a resin such as polyamide, polyester, polyethylene, polypropylene, or polyvinyl chloride. Good.

  A portion extending in the width direction between the inner bent portion 8C and the outer bent portion 7C in the length direction, in detail, inside the outer bent portion 7C and outside the inner bent portion 8C. (Filling yarn) 11 is arranged. A known yarn such as a monofilament, a monofilament twisted yarn, a multifilament, a core-sheath fiber, or the like can be applied to the boundary yarn 11, and the material thereof is, for example, a resin such as polyamide, polyester, polyethylene, polypropylene, or polyvinyl chloride. It's okay. The boundary yarn 11 preferably has a structure having a high bondability with the batt fiber layer 3, and is preferably, for example, a monofilament twisted yarn or a multifilament. For example, the yarn 11 is formed by twisting five monofilaments obtained by twisting two 0.2 mm monofilaments, or twisting three twisted yarns obtained by twisting six 0.12 mm monofilaments. It may also be a monofilament twisted yarn.

  The number of the boundary yarns 11 is arbitrary and may be one or more. The boundary yarn 11 is disposed so as not to fill a portion of the loop hole formed by the seam loop 4 through which the core wire 5 passes. That is, it is arranged on the inner bent portion 8C side in the loop hole formed by the seam loop 4. The boundary yarn 11 may be woven into a plurality of warp yarns 8 </ b> A of the inner base fabric 8. By the interlacing yarn 11 being woven into the warp yarns 8A of the inner base fabric 8, the misalignment and slipping of the interlacing yarn 11 are suppressed.

  The batt fiber layer 3 is bonded to the papermaking surface and the traveling surface of the base fabric 2 by needling. The batt fiber layer 3 is a fiber assembly, and polyamide (nylon), polyester, polyethylene, polypropylene, polyvinyl chloride, or the like is applied as the material thereof. The bat fiber layer 3 may be a core / sheath composite fiber composed of a core and a sheath covering the core. By applying a core-sheath type composite fiber having a low melting point to the bat fiber layer 3, the bonding property with the base fabric 2 can be enhanced by heat setting described later. By the needling of the bat fiber layer 3, the bat fiber layer 3 is entangled with the outer base fabric 7 and the inner base fabric 8 constituting the base fabric 2, and the outer base fabric 7 and the inner base fabric 8 are bonded to each other. The bat fiber layer 3 on the papermaking surface side at one end in the length direction of the base fabric 2 protrudes to the papermaking surface side of the seam loop row 4A to form a flap 12 that covers the papermaking surface side of the seam loop row 4A. To do. In addition, a recess 13 that can receive the flap 12 is formed on the papermaking surface side of the seam loop row 4B in the bat fiber layer 3 on the papermaking surface side of the other end in the length direction of the base fabric 2.

  As shown in FIG. 2, the papermaking seam felt 1 configured as described above is disposed endlessly (annularly) so that the surface on the papermaking surface side of the bat fiber layer 3 becomes an outer peripheral surface. The seam loops 4 provided at both ends in the length direction are meshed with each other to match the loop holes, and the core wire 5 is inserted into the loop holes, whereby the both ends are coupled to each other. The joining of both ends of the papermaking seam felt 1 is performed after the papermaking seam felt 1 is drawn into the felt run of the papermaking machine. The paper making surface of the vat fiber layer 3 is a surface that supports the wet paper, and the running surface on the back side is a surface that comes into contact with a roll of a paper machine. The flap 12 covers the papermaking surface side of the seam loop rows 4A and 4B so that no step is generated on the papermaking surface.

  Below, the manufacturing method of the papermaking seam felt 1 is demonstrated with reference to FIG. 3 (A)-(C) and FIG.4 (D)-(G). As shown in FIG. 3A, first, an outer base fabric 7 which is a flat woven fabric woven from warp yarns 7A extending in the length direction and weft yarns 7B extending in the width direction, and warp yarns extending in the length direction. An inner base fabric 8 that is a flat woven fabric woven from 8A and weft yarns 8B extending in the width direction is prepared. The outer base fabric 7 and the inner base fabric 8 are formed such that the length direction is longer than the width direction. The outer base fabric 7 is set to have the same length in the width direction and the length in the length direction slightly longer than the inner base fabric 8.

  As shown in FIG. 3 (A), the outer base fabric 7 is a flat plate shape that is folded on one surface side of the outer base fabric 7 at two outer bent portions 7C extending in the width direction and stacked in two layers. It becomes. Accordingly, the two outer bent portions 7C constitute both end portions in the length direction of the folded outer base fabric 7, and both end portions 7D of the outer base fabric 7 are in close proximity to each other. Each outer bent portion 7C is pressed using an iron or the like in the thickness direction of the outer base fabric 7 while being heated by a handy dryer or the like. Thereby, the warp yarn 7A of the outer base fabric 7 is formed into a U-shaped bent shape at each outer bent portion 7C, and the outer bent portion 7C has a stable shape.

  Similarly, the inner base fabric 8 is folded into one surface side of the inner base fabric 8 at two inner bent portions 8C extending in the width direction, and has a flat plate shape stacked in two layers. Accordingly, the two inner bent portions 8C constitute both end portions in the length direction of the folded inner base fabric 8, and both end portions 8D of the inner base fabric 8 are in close proximity to each other. Each inner bent portion 8C is pressed in the thickness direction of the inner base fabric 8 while being heated by an iron or the like. Thereby, the warp 8A of the inner base fabric 8 is formed into a U-shaped bent shape at each inner bent portion 8C, and the shape of the inner bent portion 8C is stabilized.

  As shown in FIG. 3B, the folded inner base fabric 8 is disposed inside the folded outer base fabric 7. Thereby, the base fabric 2 including the outer base fabric 7 and the inner base fabric 8 is formed. At this time, the layer including both end portions 7D of the outer base fabric 7 and the layer including both end portions 8D of the inner base fabric 8 are arranged adjacent to each other. Further, both end portions 7D of the outer base fabric 7 and both end portions 8D of the inner base fabric 8 are arranged offset in the length direction.

  The folded inner base fabric 8 may be bonded to each other by welding or the like at both ends 8D before or after being placed inside the folded outer fabric 7. Further, the folded outer base fabric 7 may have both end portions 7D joined to each other before or after the folded inner base fabric 8 is disposed inside. Further, the folded outer base fabric 7 may have both end portions 7 </ b> D bonded to one surface of the inner base fabric 8 after the folded inner base fabric 8 is disposed inside.

  Next, as shown in FIG. 3C, a plurality of wefts 7 </ b> B arranged at each outer bent portion 7 </ b> C are extracted from the outer base fabric 7. As a result, the plurality of warps 7A bent in a U shape included in the outer bent portion 7C are exposed to the outside, and the seam loop 4 is formed. Note that the order of the process of extracting the weft thread 7B from the outer bent portion 7C is not limited to this timing, and may be performed at other timing such as immediately after the outer bent portion 7C is formed.

  Next, the coupling loop row 21 formed on the miscellaneous fabric 20 is joined to each of the seam loop rows 4A and 4B of the outer base fabric 7. The miscellaneous cloth 20 is used for adjusting the shape of the seam loop 4 of each of the seam loop rows 4A and 4B. The miscellaneous cloth 20 has a length in the width direction equal to that of the base cloth 2, while the length in the length direction is short. The coupling loop row 21 includes a plurality of loops formed at one end in the length direction of the cloth 20 and arranged in the width direction. The loops of the coupling loop row 21 are formed in the same shape as the seam loop 4 so as to be coupled to the coupling loop row 21 and the seam loop rows 4A and 4B, and are arranged at the same interval in the width direction. Has been. The miscellaneous fabric 20 is formed by folding back a woven fabric including warp yarns extending in the length direction and weft yarns extending in the width direction at folds extending in the width direction, and each loop of the coupling loop row 21 is a fold of the woven fabric. It is formed by warps that are bent into a U-shape. The configuration of the miscellaneous fabric 20 is preferably the same as the configuration of the outer base fabric 7. In order to make the cloth 20 and the base cloth 2 have the same thickness, a woven cloth or a nonwoven cloth having a thickness equivalent to that of the folded inner base cloth 8 is interposed between the layers of the folded cloth 20. It is good to have.

  As shown in FIG. 4D, two miscellaneous cloths 20 are provided corresponding to each end in the length direction of the base cloth 2. The coupling loop row 21 of one miscellaneous cloth 20 is coupled to the seam loop row 4A at one end in the length direction of the base fabric 2. Specifically, the coupling loop row 21 of one miscellaneous cloth 20 is meshed with the seam loop row 4A at one end in the length direction of the base fabric 2, and each loop hole of the coupling loop row 21 is connected to the seam. The loop holes of the loop row 4A are aligned in the width direction, and a common core wire 25 is inserted into each loop hole of the coupling loop row 21 and each loop hole of the seam loop row 4A. Similarly, the coupling loop row 21 of the other miscellaneous cloth 20 is coupled to the seam loop row 4B at the other end in the length direction of the base fabric 2. Each seam loop 4 of the seam loop row 4A, 4B of the base fabric 2 is aligned at a constant interval in the width direction by being coupled to the coupling loop row 21 of the miscellaneous fabric 20 via the core wire 25. The amount of protrusion in the length direction is regulated to be constant, and the relative positions of each other are fixed at appropriate positions. The base fabric 2 to which the two miscellaneous fabrics 20 are joined is maintained in a flat plate shape.

  Next, as shown in FIG. 4 (E), the warp yarn 11 is in the width direction in a space inside each outer bent portion 7C and outside the inner bent portion 8C and outside the coupling loop row 21. Inserted into. One or more edge yarns 11 are inserted. Since the interlacing yarn 11 is inserted in a state where the loops for coupling 21 and the core wire 25 are attached to the seam loop 4, the interlacing yarn 11 fills a space for the core wire 5 of the seam loop 4 to pass therethrough. It is prevented.

  After the interlacing thread 11 is inserted, as shown in FIG. 4F, the inner base cloth 8 and the outer base cloth 7 are joined to the temporary suture thread 15, and the relative positions are fixed. The temporary suture 15 may be sewn with, for example, a sewing machine. The temporary suture thread 15 may be sewn in the vicinity of the end portion of the folded outer base cloth 7 in the length direction, and the layers formed by the inner base cloth 8 and the outer base cloth 7 are four layers. The material of the temporary suture 15 is not particularly limited, but is preferably a water-soluble filament. In other embodiments, the suturing step with the temporary suture 15 may be omitted.

  Next, as shown in FIG. 4G, the batt fiber layer 3 is bonded to the base fabric 2 including the folded outer base fabric 7 and inner base fabric 8 by needling. The bat fiber layer 3 is also applied to a portion where the interyarn 11 is arranged and a portion where one seam loop row 4A is arranged. As a result, the outer base fabric 7, the inner base fabric 8 and the warp yarn 11 are bonded to each other by the batt fiber layer 3. Needling is performed in a state where the coupling loop row 21 and the core wire 25 are attached to the seam loop 4, so that the needle that performs the needling contacts the warps 7A and 8A, and tension is applied to the warps 7A and 8A. The shape of the seam loop 4 is maintained. In addition, the seam loop rows 4A and 4B of the base fabric 2 are not joined to each other, but the seam loop rows 4A and 4B are joined to the joining loop rows 21 of the two flat plate-like cloths 20 separated from each other. Therefore, the base fabric 2 can be formed in a flat plate shape instead of an annular shape in a state where the seam loop 4 is bonded. Thereby, it becomes easy to put the base fabric 2 into the needling machine. In addition, the base fabric 2 according to the present embodiment has a four-layer structure, and when bent, the base fabric 2 is likely to be displaced. Therefore, slack caused by the displacement of the base fabric 2 between the layers by performing needling in a flat plate shape. Can be suppressed.

  After the bat fiber layer 3 is needling on the base fabric 2, heat setting is performed to enhance the bondability of the bat fiber layer 3, the base fabric 2, and the warp yarn 11. Thereafter, the core wire 25 is pulled out, and the miscellaneous cloth 20 is removed from the base cloth 2. Further, the temporary suture thread 15 is extracted from the base fabric 2. When the temporary suture 15 is a water-soluble filament, the temporary suture 15 is dissolved when the papermaking seam felt 1 is washed with water, so that the trouble of removing it is omitted. In addition, the flap 12 is formed by removing the batt fiber layer in the vicinity of one seam loop row 4A, and the recess 13 that can receive the flap 12 by removing the batt fiber layer in the vicinity of the other seam loop row 4B. Form. Through the above steps, the seam felt 1 is completed as shown in FIG.

  Next, the effect of the papermaking seam felt 1 according to the embodiment will be described. The papermaking seam felt 1 can increase the void volume of the papermaking seam felt 1 with a simple configuration in which the folded inner base cloth 8 is arranged inside the folded outer base cloth 7. In addition, since the outer base fabric 7 forms the seam loop 4 and the inner base fabric 8 is arranged inside the outer base fabric 7, regardless of errors in the length direction dimensions of the outer base fabric 7 and the inner base fabric 8. The seam loop 4 is appropriately formed.

  In the papermaking seam felt 1, the woven structure of the outer base fabric 7 and the inner base fabric 8, the structure of the yarn (monofilament, multifilament, etc.), the material of the yarn, the yarn diameter, and the yarn density can be freely set. Can be set. In particular, by making the configurations of the outer base fabric 7 and the inner base fabric 8 different from each other, the degree of freedom in selecting the characteristics that can be realized by the base fabric 2 is improved. For example, the thread diameter of the outer base fabric 7 forming the seam loop 4 is increased to ensure durability, while the thread diameter of the inner base fabric 8 is decreased to improve the bondability with the bat fiber layer 3. Characteristics that are difficult to achieve with a single base fabric can be realized on the base fabric.

  Moreover, since the unevenness | corrugation of the surface of the outer base fabric 7 and the inner base fabric 8 becomes difficult to mutually fit because the structure of the outer base fabric 7 and the inner base fabric 8 is different, the void volume and porosity of the base fabric 2 Will increase. In particular, when the inner base fabric 8 folded so that the warp yarn 8A is inclined with respect to the length direction is arranged inside the outer base fabric 7 folded so that the warp yarn 7A extends in the length direction, The irregularities on the surfaces of the cloth 7 and the inner base cloth 8 become more difficult to fit together, and the void volume and void ratio of the base cloth 2 increase.

  The warp 7A and the weft 7B of the outer base fabric 7 are composed of monofilaments, the warp 8A of the inner base fabric 8 is composed of monofilament twisted yarns, and the weft 8B is composed of monofilaments. Durability and void volume are increased, and the bonding property between the base fabric 2 and the batt fiber layer 3 is enhanced by the inner base fabric 8. Further, when the yarn density of the warp yarns 8A and the weft yarns 8B constituting the inner base fabric 8 is made higher than the yarn density of the warp yarns 7A and the weft yarns 7B constituting the outer base fabric 7, the outer base fabric 7 causes the gaps in the base fabric 2 to be increased. The volume is increased, and the inner base fabric 8 enhances the bondability of the base fabric 2 with the batt fiber layer 3.

  Further, both ends of the folded inner base fabric 8 in the length direction become inner bent portions 8C, and the loop structure of the warp 8A is arranged instead of the free end of the warp 8A. Unraveling of the warp 8A and the weft 8B due to the shrinkage of the warp 8A during heat setting is prevented. In addition, when the end portion of the folded inner base fabric 8 in the length direction is the inner bent portion 8C and the warp yarn 8A does not form a free end, the end yarn 11 is inserted inside the outer bent portion 7C. In addition, the warp 8A of the inner base fabric 8 and the warp yarn 11 are not easily caught, and the warp yarn 11 can be easily inserted.

  Since the warp yarn 11 is arranged inside the outer bent portion 7C and outside the inner bent portion 8C, the bat fiber layer 3 can be entangled with the warp yarn 11, so that the vicinity of the seam loop 4 of the base fabric 2 And the batt fiber layer 3 are enhanced. In addition, by making the boundary yarn 11 into a monofilament twisted yarn or a multifilament, the bondability between the boundary yarn 11 and the batt fiber layer 3 is further improved.

  A preferred example of the above embodiment will be illustrated below.

(First embodiment)
The outer base fabric 7 uses a monofilament of nylon and a diameter of 0.4 mm for the warp yarn 7A, and uses a monofilament of nylon and a diameter of 0.4 mm for the weft yarn 7B. did. The yarn density (number per inch in the width direction) of the warp 7A was 20 / in, and the yarn density (number per inch in the length direction) of the weft 7B was 20 / in. The inner base fabric 8 uses a monofilament of nylon and a diameter of 0.28 mm for the warp 8A, and uses a monofilament of nylon and a diameter of 0.25 mm for the weft 8B. did. The yarn density of the warp 8A was 35 / in, and the yarn density of the weft 8B was 30 / in.

(Second embodiment)
The outer base fabric 7 uses a monofilament of nylon and a diameter of 0.4 mm for the warp 7A, and uses a monofilament of nylon and a diameter of 0.4 mm for the weft 7B. Breaking (After the warp 7A continuously straddles two wefts 7B, the basic pattern of continuously submerging the next two wefts 7B is repeated, and the portion where the warp 7A straddles two wefts 7B continuously Organization). The yarn density of the warp 7A was 28 / in, and the yarn density of the weft 7B was 16 / in. The inner base fabric 8 uses a warp 8A, a monofilament twisted yarn of three filaments formed by twisting two filaments having a diameter of nylon and a diameter of 0.2 mm, and the weft yarn 8B is made of nylon. A monofilament having a diameter of 0.35 mm was used, and the woven structure was a flat structure. The yarn density of the warp 8A (twisted yarn) was 20 / in, and the yarn density of the weft 8B was 15 / in.

(Third embodiment)
The outer base fabric 7 uses a monofilament of nylon and a diameter of 0.4 mm for the warp yarn 7A, and uses a monofilament of nylon and a diameter of 0.4 mm for the weft yarn 7B. did. The yarn density of warp 7A was 20 / in, and the yarn density of weft 7B was 20 / in. The inner base fabric 8 uses a monofilament of nylon and a diameter of 0.28 mm for the warp 8A, and uses a monofilament of nylon and a diameter of 0.25 mm for the weft 8B. did. The yarn density of the warp 8A was 35 / in, and the yarn density of the weft 8B was 30 / in. Further, the inner base fabric 8 is folded so that the warp 8A is inclined with respect to the length direction.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. In the above embodiment, the outer base fabric 7 and the inner base fabric 8 are woven in a flat shape, but a woven fabric woven endlessly from the beginning by bag weaving may be used.

1. Seam felt for papermaking, 2 ... Base fabric, 3 ... Butt fiber layer, 4 ... Loop for seam, 4A, 4B ... Loop row for seam, 5 ... Core wire, 7 ... Outer base fabric, 7A ... Warp, 7B ... Weft, 7C ... Outer bending, 7D ... End, 8 ... Inner base fabric, 8A ... Warp, 8B ... Weft, 8C ... Inside bent part, 8D ... End, 11 ... Edge thread, 12 ... Flap, 15 ... Temporary suture, 20 ... Miscellaneous cloth, 21 ... Loop loop for coupling, 25 ... Core wire

Claims (8)

When the woven fabric including the warp extending in the length direction and the weft extending in the width direction is folded into a flat plate shape, outer bent portions extending in the width direction are formed at both ends in the length direction, respectively. An outer base fabric in which a loop for seam made of warp is formed in each of the parts;
By folding into a flat plate shape including warps and wefts, inner bent portions extending in the width direction are formed at both ends in the length direction, respectively, and an inner base fabric disposed inside the outer base fabric;
A batt fiber layer bonded to the base fabric including the outer base fabric and the inner base fabric,
Each of the inner bent portions is arranged on the inner side in the height direction than the corresponding outer bent portion ,
A seam felt for papermaking, wherein a yarn extending in the width direction is arranged inside the outer bent portion and outside the inner bent portion . 2. The papermaking seam felt according to claim 1, wherein the edge yarn is woven into a plurality of the warp yarns of the inner base fabric .   The papermaking seam felt according to claim 2, wherein the interlaced yarn includes at least one of a monofilament twisted yarn and a multifilament.   The papermaking seam felt according to any one of claims 1 to 3, wherein a configuration of the outer base fabric and a configuration of the inner base fabric are different from each other.   The warp and the weft of the outer base fabric include a monofilament, the warp of the inner base fabric includes at least one of a monofilament and a monofilament twisted yarn, and the weft of the inner base fabric includes a monofilament. The papermaking seam felt according to claim 4.   The seam felt for papermaking according to claim 4 or 5, wherein the yarn density of the inner base fabric is higher than the yarn density of the outer base fabric. A step of folding an outer base fabric composed of a woven fabric including warp yarns extending in the length direction and weft yarns extending in the width direction into flat plates, and forming outer bent portions extending in the width direction at both ends in the length direction. When,
Folding the inner base fabric composed of a woven fabric including warps and wefts into a flat plate shape, and forming inner bent portions extending in the width direction at both ends in the length direction; and
Disposing the inner base fabric folded inside the outer base fabric folded to form a base fabric in which the outer base fabric and the inner base fabric are laminated;
Extracting the weft from the outer bent portion and forming a plurality of seam loops comprising warps; and
Aligning the seam loop with a coupling loop formed on a cloth, and inserting a common core wire into the seam loop and the coupling loop of the cloth; and
A method for producing a seam felt for papermaking, comprising a step of bonding a batt fiber layer to the base fabric by needling after the step of inserting the core wire . Between the step of inserting the core wire into the seam loop and the coupling loop and the step of performing the needling, the inner side of the outer bent portion, the outer side of the inner bent portion, and the coupling The method for producing a papermaking seam felt according to claim 7 , further comprising a step of inserting a warp yarn in the width direction outside the loop for printing.

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