JP2007239126A - Seamed felt for papermaking use and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To produce a ground fabric having a multiple structure to keep a large vacant space by a folding method in improved efficiency. <P>SOLUTION: A nonwoven fabric layer 2 is laminated and integrated to a ground fabric 1 by needling and a joint loop 6 is formed by folding the warp 5 at the folded part obtained by folding a definite-end woven fabric 3 constituting the ground fabric to obtain a seamed felt. The ground fabric has four woven fabric layers L1-L4 overlapped in the direction of thickness and formed by folding the woven fabric in a manner to form four folded parts 3c-3f at each of both ends in longitudinal direction while placing the end parts 3a, 3b of the woven fabric at the middle position of the longitudinal direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a felt with a seam for papermaking having a base fabric in which a joining loop is formed by folding back warp yarn at a bent portion by folding a woven fabric with ends.

  In the felt for papermaking used in the wet paper pressing process, one of the required conditions is that the required thickness corresponding to the papermaking conditions is required under compression, and the amount of voids is particularly high for the purpose of ensuring high water squeezing. In order to increase the size, a base fabric having a multiple structure in which warps are arranged in triple or quadruple may be adopted. In addition, there is a so-called felt with seam, in which both ends of the felt are pulled into the felt runn and endlessly joined to each other in order to improve workability into the paper machine. It is also desirable to make seams in felts that use this base fabric.

However, in this type of felt with seam, both ends are joined by passing the core wire through a common hole formed by meshing loops formed at both ends in the length direction by folding back the warp constituting the base fabric. In manufacturing, wefts on the paper machine are used as warps (warping yarns) on the loom, and the warps on the paper machine are woven as driven yarns on the loom to form loops at both ends of the base fabric. In addition to the method, a method is known in which loops are formed by folding back warp yarns at folded portions formed at both ends by folding a woven fabric with ends (see Patent Documents 1 and 2).
JP-A-1-306696 Japanese Patent No. 2838547

  However, since the felt with a seam by the folding method described above can use a woven fabric with ends, it can be manufactured at a low cost using a small or high-speed loom, and the woven fabric is cut into an appropriate size. However, in the conventional folding method, a single woven fabric having a ring shape with the ends joined is simply crushed. Therefore, there is a problem that a base fabric having a structure in which two layers of a single woven fabric layer are overlapped with each other and a demand for securing a large void amount cannot be sufficiently satisfied.

  The present invention has been devised to solve such problems of the prior art, and its main purpose is to efficiently produce a multi-structure base fabric capable of securing a large amount of voids by a folding method. It is an object of the present invention to provide a felt with a seam for papermaking and a method for producing the same.

  In order to solve such a problem, in the present invention, as shown in claim 1, a non-woven fiber layer is laminated and integrated on a base fabric by needling. In the felt with a seam for papermaking in which a joining loop is formed by folding back the warp yarn at the folded portion by folding, the base fabric is arranged in the lengthwise direction with the end portion of the woven fabric disposed at an intermediate position in the lengthwise direction. The woven fabric was folded so that a plurality of bent portions were formed at both ends, and at least four fabric layers overlapping in the thickness direction were formed.

  In the present invention, as shown in claim 2, a non-woven fiber layer is laminated and integrated on the base fabric by needling, and the warp yarns at the folded portion are formed by folding the end woven fabric to be the base fabric. In the method for manufacturing a felt with a seam for papermaking in which a joining loop is formed by folding, a plurality of bent portions are formed at both ends in the length direction in a state where the end portions of the woven fabric are arranged at intermediate positions in the length direction. The woven fabric was folded so that at least four fabric layers overlapped in the thickness direction.

  According to this, since it becomes a multi-layered structure in which four or more fabric layers are stacked, a large amount of voids can be secured. Furthermore, two or more loops for joining the end portions can be provided by a plurality of bent portions formed at the end portions in the length direction, thereby increasing the joining strength.

  Moreover, at least two layers of woven fabric portions extending continuously over the entire length in the length direction of the base fabric are formed, and the woven fabric portions partially extending in the length direction of the base fabric are also entangled by needling. Since it is firmly integrated with the fibers that form the nonwoven fiber layer, sufficient strength against external forces acting in the length direction can be secured without joining the ends of the woven fabric by welding or stitching. Manufacturing man-hours can be reduced.

  In this case, the structure of the woven fabric is not particularly limited, but a single woven fabric, particularly a plain woven fabric, is effective in forming a joint loop of an appropriate shape, which facilitates engagement of the joint loop. Thus, workability can be improved.

  As described above, according to the present invention, a multi-structure base fabric capable of securing a large amount of voids can be efficiently manufactured by a folding method, and therefore, high water squeezing required in a press part (pressing part) of a paper machine. A great effect can be obtained in producing a felt having a low cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view showing an example of a felt with seam according to the present invention, in which (A) shows a folding method of a woven fabric and (B) shows a completed state. This felt with seam is formed by laminating a nonwoven fabric layer 2 on a base fabric 1 by needling, and the base fabric 1 has a multiple structure in which four fabric layers L1 to L4 overlap in the thickness direction. There is no.

  The base fabric 1 is manufactured by folding one end woven fabric, and two bent portions 3c to 3f are formed in total at the two ends in the length direction. The end portions 3a and 3b of the woven fabric 3 are arranged at intermediate positions in the length direction and are not joined to each other.

  In the base fabric 1, the joining loops 6 and 7 are overlapped in the thickness direction at the end portions 1 a and 1 b in the length direction of the base fabric 1 by folding back the warp yarn 5 at the bent portions 3 c to 3 f by folding the woven fabric 3. The end portion of the base fabric 1 is formed by inserting the core wire 8 into a common hole formed by alternately engaging these joining loops 6 and 7 so that their center holes are aligned with each other. 1a and 1b are joined together.

  The base fabric 1 is divided into first to fifth portions 3g to 3k with four bent portions 3c to 3f as boundaries, and second, third, and fourth portions 3h, 3i, and 3j are The cloth 1 extends continuously over the entire length in the length direction. On the other hand, the first and fifth portions 3g and 3k provided with the end portions 3a and 3b partially extend in the length direction of the base fabric 1, but are formed fibers of the nonwoven fiber layer 2 entangled by needling Thus, since the overlapping portions of the first to fifth portions 3g to 3k are firmly integrated, sufficient strength can be obtained with respect to the external force acting in the length direction.

  In particular, here, first and fifth portions 3g and 3k having end portions 3a and 3b, respectively, are arranged inside the base fabric 1, and the second portion 3h, the third portion 3i, and the fourth portion 3j. It is sandwiched between. Further, the third portion 3i bends and passes between the two end portions 3a and 3b, and in the right region across the bent portion, the second portion 3h, the first portion 3g, 3 portion 3i and fourth portion 3j form a four-layer structure, and in the left region across the bent portion of third portion 3i, second portion 3h, third portion 3i, fifth portion A four-layer structure is formed by the portion 3k and the fourth portion 3i.

  The structure of the woven fabric 3 is not particularly limited, but a single woven fabric, particularly a plain woven fabric, is effective in forming the joint loops 6 and 7 having an appropriate shape. Can be improved.

  FIG. 2 is a top view of the woven fabric shown in FIG. In manufacturing the base fabric from the woven fabric 3, first, marks of the four bent portions 3c to 3f that serve as a standard for folding are given to the woven fabric 3 woven or cut into a predetermined length. In addition, a mark for alignment when the first and fifth portions 3g and 3k having the end portions 3a and 3b are overlapped with the third portion 3i is attached.

  FIG. 3 is a schematic cross-sectional view showing the manufacturing process of the base fabric shown in FIG. 1 step by step. First, as shown in FIG. 3A, the end portions 3a and 3b are sewn to the third portion 3i with the suture thread 31 and temporarily fixed. The second portions 3h and the fourth portion 3i are sewn together with the end portions 3a and 3b and the third portion 3i so that the bent portions 3c to 3f are not displaced, and the bent portions 3c to 3f are also sewn. The first to fifth portions 3g to 3k may be sewn in the vicinity.

  Next, the woven fabric 3 is folded, the first to fifth portions 3g to 3k are overlapped with each other, and a predetermined number of wefts of the bent portions 3c to 3f are taken out, as shown in FIG. Joining loops 6 and 7 are formed at both ends. Next, as shown in FIG. 3C, by joining the joint loops 6 and 7 at both ends and passing the core wire 32, the folded woven fabric 3 is joined endlessly to stabilize the shape. Perform heat setting. And as shown in FIG.3 (D), the excess parts 33 * 34 are excised so that the edge parts 3a * 3b may not overlap in the thickness direction.

  In this way, the base fabric 1 is manufactured, and the joining loops 6 and 7 are engaged again and joined endlessly through the core wire 32, and then a butt for forming the non-woven fiber layer 2 is stacked to perform needling. Thus, the felt with seam shown in FIG. 1B is obtained.

  4A and 4B are schematic cross-sectional views showing another example of the felt with seam according to the present invention. FIG. 4A shows a folding procedure of a woven fabric, and FIG. 4B shows a completed state. Here, in the same manner as in the above example, the base fabric 41 is arranged in a state where the end portions 43a and 43b of the woven fabric 43 are arranged at the intermediate positions in the length direction, and a total of four bent portions, two at each end in the length direction. The woven fabric 43 is folded so that 43c to 43f are formed, and a multi-layer structure in which the four fabric layers L1 to L4 overlap in the thickness direction is formed, and two joining loops 6 and 7 are arranged at the end portions 41a and 41b, respectively. It is formed one by one.

  In particular, here, the first and fifth portions 43g and 43k respectively provided with the end portions 43a and 43b of the woven fabric 43 are arranged outside the base fabric 1, and the second to fourth portions 43h to 43j are bent. In the region on the right side between the two end portions 43a and 43b and sandwiching the bent portion, the second portion 43h, the third portion 43i, the fourth portion 43j, and the fifth portion from the papermaking surface 9 side. The portion 43k has a four-layer structure, and in the region on the left side of the bent portion, the first portion 43g, the second portion 43h, the third portion 43i, and the fourth portion 43i have a four-layer structure. Is formed.

  FIG. 5 is a schematic cross-sectional view showing another example of the felt with seam according to the present invention, in which (A) shows the folding procedure of the woven fabric and (B) shows the completed state. Here, similarly to the example of FIG. 1 described above, the base fabric 51 has a multi-layer structure in which the woven fabric 53 is folded and the four fabric layers L1 to L4 overlap each other, and the joining loops 6. 7 is formed in two rows, but unlike the above example, a total of six bent portions 53c to 53h are formed, two at each end in the length direction and two at the middle position in the length direction. The woven fabric 53 is folded. The end portions 53a and 53b of the woven fabric 53 are butted against each other at an intermediate position in the length direction, and the bent portions 53c and 53f at the middle position in the length direction are also butted against each other.

  In this base fabric 51, the woven fabric 53 is partitioned into first to seventh portions 53i to 53o with six bent portions 53c to 53h as boundaries, and the third portion 53k and the sixth portion 53n are based on the base fabric 51. The cloth 1 extends continuously over the entire length in the length direction. On the other hand, the first portion 53i, the second portion 53j, the fourth portion 53l, the fifth portion 53m, and the seventh portion 53o partially extend in the length direction of the base fabric 1, but the need Since the non-woven fiber layer forming fibers entangled with the ring are firmly integrated with each other of the first to seventh portions 53i to 53o, sufficient strength against external force acting in the length direction is obtained. be able to.

  Further, in the base fabric 51, first and seventh portions 53i and 53o having end portions 53a and 53b of the woven fabric 53 are disposed inside the base fabric 1, and the second portion 53j and the sixth portion 53 Since it is sandwiched between the portion 53n and firmly restrained from both sides, the displacement of the first and seventh portions 53i and 53o can be suppressed.

  FIG. 6 is a schematic cross-sectional view showing another example of the felt with seam according to the present invention, in which (A) shows the folding procedure of the woven fabric and (B) shows the completed state. Here, substantially in the same manner as in the example of FIG. 1 described above, the base fabric 61 has a total of 4 pieces, two at each end in the length direction, with the end portions 63a and 63b of the woven fabric 63 disposed at the middle position in the length direction. The woven fabric 63 is folded so that two bent portions 63c to 63f are formed, and the first to fifth portions 63g to 63k overlap each other to form four layers of fabric layers L1 to L4.

  In particular, unlike the above example, the woven fabric 63 is folded so that the folding portions 63e and 63f on the traveling surface 10 side are displaced in the length direction with respect to the folding portions 63c and 63d on the papermaking surface 9 side, The joining loops 6 and 7 provided in two rows at each end 61a and 61b of the base fabric 61 are arranged so as to be shifted in the length direction. Thereby, since the difference in the characteristic between a seam part and a ground part, especially the difference in water flow resistance can be made small, a seam mark can be suppressed.

  FIG. 7 is a schematic cross-sectional view showing another example of the felt with seam according to the present invention, in which (A) shows the folding procedure of the woven fabric and (B) shows the completed state. Here, in the same manner as in the example of FIG. 1 described above, the base fabric 71 has a total of 4 pieces, two at each end in the length direction, with the end portions 73a and 73b of the woven fabric 73 arranged at the middle position in the length direction. The woven fabric 73 is folded so that two bent portions 73c to 73f are formed, and the first to fifth portions 73g to 73k overlap each other to form four layers of fabric layers L1 to L4.

  In particular, here, unlike the above example, the joining loop is not formed in the bent portions 73e and 73f on the traveling surface 10 side, and the end portions 71a and 71a of the base fabric 71 are formed by the bent portions 73c and 73d on the papermaking surface 9 side. The joining loops 6 and 7 are provided in one row in 71b. Further, the woven fabric 73 is folded so that the bent portions 73e and 73f on the traveling surface 10 side are shifted in the length direction with respect to the bent portions 73c and 73d on the paper making surface 9 side, so that the joining surface is not formed. A protrusion 74 is formed on the traveling surface 10 side of the joining loop 7 by the bent portion 73f. The protrusion 74 protects the running surface 10 side of the joining loops 6 and 7 and can prevent the joining strength from being reduced due to wear of the joining loops 6 and 7.

  In contrast to this example, a mode is also possible in which the joining loop is formed by the bent portions 73e and 73f on the traveling surface 10 side and the joining loop is not formed by the bent portions 73c and 73d on the papermaking surface 9 side. In this case, it is possible to protect the flap 11 from which the non-woven fiber layer 2 protrudes so as to cover the papermaking surface 9 side of the joining loops 6 and 7, and to suppress damage to the flap 11.

  FIG. 8 is a schematic cross-sectional view showing another example of the felt with seam according to the present invention, in which (A) shows the folding procedure of the woven fabric and (B) shows the completed state. Here, the base fabric 81 has a form in which two fabric layers are added to the base fabric 1 shown in FIG. 1, and the end portions 83a and 83b of the woven fabric 83 are arranged at intermediate positions in the length direction. The woven cloth 83 is folded so that a total of six bent portions 83c to 83h are formed at both ends in the length direction, thereby forming a multi-layer structure in which the six fabric layers L1 to L6 overlap in the thickness direction. Further, three rows of joining loops 6 and 7 are formed at the end portions 81a and 81b in the length direction of the base fabric 1 by folding back the warp 5 at the bent portions 83c to 83h.

  Further, in the base fabric 81, the woven fabric 83 is partitioned into first to seventh portions 83i to 83o with the six bent portions 83c to 83h as boundaries, and the third portion 83k, the fourth portion 83l, The first portion and the seventh portion 83i each of which includes a portion 83m and a sixth portion 83n that continuously extend over the entire length in the length direction of the base fabric 1, and each of which includes end portions 83a and 83b. 83o extends partially in the length direction of the base fabric 1, and in the same manner as in the above examples, the first to seventh portions 83i are formed by the forming fibers of the non-woven fiber layer 2 entangled by needling. Since the overlapped ones of -83o are firmly integrated, sufficient strength can be obtained with respect to the external force acting in the length direction.

  The felt with a seam for papermaking according to the present invention and the method for producing the same have the effect of efficiently producing a base fabric having a multiple structure capable of securing a large amount of voids by a folding method, and is a press part (squeezing part) of a paper machine. It is useful as a press felt used.

Schematic sectional view showing an example of felt with seam according to the present invention Top view of the woven fabric shown in FIG. Schematic cross-sectional view showing the manufacturing process of the base fabric shown in FIG. Schematic sectional view showing another example of felt with seam according to the present invention Schematic sectional view showing another example of felt with seam according to the present invention Schematic sectional view showing another example of felt with seam according to the present invention Schematic sectional view showing another example of felt with seam according to the present invention Schematic sectional view showing another example of felt with seam according to the present invention

Explanation of symbols

1, 41, 51, 61, 71, 81 Base fabric 2 Non-woven fiber layer 3, 43, 53, 63, 73, 83 Woven fabric 3a, 3b, 43a, 43b, 53a, 53b, 63a, 63b, 73a, 73b · 83a · 83b Ends 3c to 3f · 43c to 43f · 53c to 53h · 63c to 63f · 73c to 73f · 83c to 83h Bent part 5 Warp 6 · 7 Joining loop 8 Core wires L1 to L6 Textile layer

Claims (2)

A felt with a seam for papermaking, in which a non-woven fiber layer is laminated and integrated on a base fabric by needling, and a joining loop is formed by folding back warps at the folded portion of the end-woven fabric used as the base fabric. Because
In the thickness direction, the base fabric is folded in such a manner that a plurality of bent portions are formed at both ends in the length direction, with the end portion of the woven fabric being arranged at an intermediate position in the length direction. A felt with a seam for papermaking, characterized in that at least four woven fabric layers overlapping each other are formed. A felt with a seam for papermaking, in which a non-woven fiber layer is laminated and integrated on a base fabric by needling, and a joining loop is formed by folding back warps at the folded portion of the end-woven fabric used as the base fabric A manufacturing method of
With the end portion of the woven fabric disposed at an intermediate position in the length direction, the woven fabric is folded so that a plurality of bent portions are formed at both ends in the length direction, so that at least four fabric layers are thick. A process for producing a felt with a seam for papermaking, wherein the felt is overlapped in the vertical direction.

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