JP2007023449A - Multilayer woven fabric and friction material and filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multilayered woven fabric whose weaves can be bound with binding yarns to prevent interlayer peeling and which can be woven with less picking mechanisms than the number of the needed layers. <P>SOLUTION: This multi-layered woven fabric is characterized by arranging weaves 12 woven with warps and wefts arranged to form double woven fabrics and binding the weaves 12 with binding yarns 13a, 13b disposed to pass between adjacent wefts constituting the weaves 12 and turn up in the thickness direction of the woven fabric. 50 to 100 Denier multifilament bundles are preferably used as the warps, the wefts and the binding yarns, respectively. The warps constituting the upper side layer of a pair of double woven fabrics are disposed to pass through the upper side of the wefts constituting the lower layer, and the warps constituting the lower side layer of the double woven fabrics are disposed to pass through the lower side of the wefts constituting the upper layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a multilayer fabric, a friction material, and a filter.

  As a wet friction material used for a wet clutch or a wet brake, a friction material has been proposed that can reliably prevent delamination and can suppress a decrease in elasticity when used as a friction material. (For example, refer to Patent Document 1). The friction material described in Patent Document 1 is formed of a multifilament fiber bundle of 50 denier or less and a plurality of layers woven with warps and wefts so that the weave density of each layer is 3 yarns / mm or more. A thermosetting resin is impregnated and cured in a three-dimensional woven fabric in which the weave structure is bonded with a binding yarn.

Further, as a heavy load lifting belt, there is disclosed a lifting belt configured by superposing and sewing two belt bodies made of synthetic fiber cored bag fabric having a sheath portion and a core portion vertically (for example, (See Patent Document 2).
JP 2004-182911 A (paragraphs [0048] to [0050] in FIG. 1, FIG. 1) Japanese Utility Model Publication No. 62-173378

  The three-dimensional woven fabric (multilayer woven fabric) constituting the friction material of Patent Document 1 can surely prevent delamination because a plurality of layers of woven structures are bonded with a binding yarn. However, in order to weave the multilayer woven fabric of Patent Document 1, weft insertion mechanisms are required for the number of layers of the woven fabric.

  On the other hand, if the structure of the heavy load lifting belt described in Patent Document 2 is applied to the friction material, and the stitched fabric of the bag weave structure is used as the base material of the friction material, the fabric of the bag weave has the required number of layers. The base material of the friction material can be obtained by sewing several times. However, since the fabric of the bag weave structure is stitched, the thread constituting each layer is damaged by the sewing needle. In particular, when a woven fabric is used as a friction material, damage to the surface (friction surface) leads to a decrease in the friction coefficient and deterioration in durability. In addition, when a dense fabric is stitched in a plurality of layers, the sewing needle is easily broken and the surface thread is damaged.

  The present invention has been made in view of the above-described conventional problems, and a first object of the present invention is to prevent delamination by bonding a plurality of layers of woven structures with bonding yarns, and from the number of necessary layers. The object is to provide a multilayer fabric that can be woven by using a small number of weft insertion mechanisms. A second object is to provide a friction material or a filter using the multilayer fabric.

  In order to achieve the first object, the invention according to claim 1 is characterized in that at least a woven structure woven with warps and wefts arranged to constitute a double weave is arranged in a plurality of layers, and the woven structure A plurality of layers of weaving structures are joined together by connecting yarns arranged so as to pass between adjacent wefts constituting the fabric and folded back in the thickness direction of the fabric. In this invention, delamination is prevented because a plurality of layers of the weave structure are bonded with the bonding yarn. Further, since the woven fabric is woven in the same way as the double weaving, the warp and the weft can be woven by a loom equipped with a weft insertion mechanism having fewer layers than the multilayer woven fabric. Further, the wefts are arranged densely as compared with the double woven fabric as a whole, and the cushioning property is improved.

  The invention according to claim 2 is the warp comprising the upper layer of a pair of double weaves of the warp and weft arranged so as to constitute the double weave in the invention according to claim 1. Is arranged so that it passes through the upper side of the weft constituting the lower layer, and the warp yarn constituting the lower layer of the double weave is arranged so as to pass under the weft constituting the upper layer. Yes. Further, the wefts constituting the upper layer and the wefts constituting the lower layer are alternately arranged in a state where the movement of the warp yarns in the arrangement direction is restricted by the binding yarns. In this case, the wefts arranged in the overlapping state in the thickness direction in the absence of the binding yarn are not arranged in the overlapping state in the thickness direction due to the presence of the binding yarn, and the thickness direction of the fabric and the arrangement of the warp yarns It is arranged in a state shifted in the direction. Therefore, the wefts are arranged densely as a whole as compared with the case of a double woven fabric, the cushioning property is improved, the displacement between layers due to the shearing force hardly occurs, and the shape stability of the fabric is increased.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the woven structure is composed only of warps and wefts having a structure corresponding to double weaving. The multilayer fabric of the present invention can be woven with a loom equipped with a weft insertion mechanism that is half the number of layers of the multilayer fabric.

  A fourth aspect of the present invention is the invention according to any one of the first to third aspects, wherein a plurality of sets of layers corresponding to the double weave are provided. In the multilayer fabric of the present invention, the number of weft layers is four or more.

  A friction material according to a fifth aspect of the present invention is formed by impregnating and curing a thermosetting resin on the multilayer fabric according to any one of the first to fourth aspects and performing an outer shape process. . In the present invention, the durability of the friction material is improved and the shape stability is also improved.

  A filter according to a sixth aspect of the present invention is constituted by the multilayer fabric according to any one of the first to fourth aspects. In this invention, durability is ensured when used as a filter. In addition, it is easy to obtain a filter having a higher weft yarn density than a configuration in which plain weave fabrics are stacked.

  According to the first to fourth aspects of the present invention, a plurality of layers of woven structures can be bonded with bonding yarns to prevent delamination, and a weft insertion mechanism having a number smaller than the required number of layers is used. A multilayer fabric that can be woven with can be provided. Moreover, according to invention of Claim 5 or Claim 6, the friction material or filter which uses the multilayer fabric can be provided.

  Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. FIG. 1A is a schematic diagram showing a structure of a multilayer fabric, and FIG. 1B is a schematic diagram showing a structure when warps, wefts, and binding yarns constituting the multilayer fabric are arranged without being beaten. c) is a schematic diagram showing a configuration of a normal double weave without a binding yarn. 2 to 5 are schematic views showing a woven state of a multilayer fabric, and FIG. 6 is a schematic perspective view showing a state in which a friction material is punched out from a sheet-like intermediate product.

  As shown in FIG. 1 (a), the multilayer fabric 11 includes upper warps U1x, U2x, U3x, U4x and wefts U1y, U2y, middle warps M1x, M2x, M3x, M4x, wefts M1y, M2y, and lower layers. The weave structure 12 composed of warp yarns L1x, L2x, L3x, L4x and weft yarns L1y, L2y is arranged in a plurality of layers (six layers in this embodiment). The upper layer, the middle layer, and the lower layer woven structure 12 are each woven with warp and weft arranged to form a double weave, and the plurality of layers of woven structure 12 are adjacent wefts U1y, U2y, M1y, M2y, L1y. , L2y, and connected by connecting yarns 13a and 13b arranged so as to be folded back in the thickness direction of the fabric. Each structure 12 is composed of a plain weave. Of the warps and wefts arranged to form a double weave, the warps U1x, U2x, M1x, M2x, L1x, and L2x constituting the upper layer of a pair of double weave constitute the lower layer The wefts U2y, M2y, and L2y are arranged so as to pass above. The warp yarns U3x, U4x, M3x, M4x, L3x, and L4x constituting the lower layer of the double weave are arranged so as to pass below the wefts U1y, M1y, and L1y constituting the upper layer. .

  In FIG. 1 (a), when the left side is the front side of the multi-layer fabric 11, it is arranged on the rear side of each set of wefts U1y, U2y, M1y, M2y, L1y, L2y when forming a double weave. The weft yarns U2y, M2y, L2y are arranged one step lower than the weft yarns U1y, M1y, L1y arranged on the front side, so that the multilayer fabric 11 is composed of six layers as a whole.

  As shown in FIG. 1 (b), when the warps U1x, U2x, etc., the wefts U1y, U2y, etc. and the binding yarns 13a, 13b are arranged without weaving during weaving, the upper warps U1x, U2x are the wefts Every other U1y is arranged to pass the same side, and the warps U3x and U4x are arranged to pass every other side to the weft U2y. Similarly, the warp yarns M1x and M2x in the middle layer are arranged so as to pass every other side with respect to the weft yarn M1y, and the warp yarns M3x and M4x are arranged so as to pass every other side with respect to the weft yarn M2y. The Further, the lower warps L1x and L2x are arranged to pass the same side every other weft L1y, and the warps L3x and L4x are arranged to pass the same side every other weft L2y. .

  The binding yarns 13a and 13b are arranged so as to pass between the front wefts U1y, M1y and L1y and the rear wefts U2y, M2y and L2y. From this state, the warps U1x to U4x, M1x to M4x, L1x to L4x and the binding yarns 13a and 13b are tightened, and the rear wefts U2y, M2y, and L2y are changed to the front wefts U1y, M1y, and L1y by the beating operation. When moved and arranged so as to approach each other, the structure shown in FIG. The wefts U1y, M1y, L1y constituting the upper layer of each pair of double weaves and the wefts U2y, M2y, L2y constituting the lower layer are restricted from moving in the warp arrangement direction by the binding yarns 13a, 13b. Are arranged alternately.

  On the other hand, in the conventional double weaving in which the binding yarns 13a and 13b are not present, the warp yarns U1x to U4x, M1x to M4x, and L1x to L4x are tightened and the wefts U2y, M2y, and L2y on the rear side are moved to the front side due to the action of beating When arranged so as to approach the wefts U1y, M1y, and L1y, the structure shown in FIG. That is, the rear wefts U2y, M2y, L2y are arranged below the front wefts U1y, M1y, L1y, and when viewed from the thickness direction, the wefts U1y, M1y, L1y and the wefts U2y, M2y, L2y Will be overlapped.

The total number of the binding yarns 13a and 13b is appropriately set depending on the performance required for the multilayer fabric 11. For example, the total number of the binding yarns 13a and 13b is set to 1/4 of the total number of the warp yarns U1x to U4x.
The binding yarn 13a penetrates the six layers of the weave structure 12 from one side (upper side of FIG. 1 (a)) and is folded back on the other side (lower side of FIG. 1 (a)). It is arranged to penetrate from. The binding yarn 13b is arranged so as to penetrate the six layers of the weave structure 12 from the other side and bend back at one side to penetrate each structure 12 from the one side.

  A multifilament fiber bundle is used for each warp, weft, and binding yarn, and 50 to 100 denier yarn is used. As the fiber material, an aramid fiber having good wear resistance, a simple carbon fiber having good heat resistance, or a mixture of aramid fiber and carbon fiber is used.

  Next, the manufacturing method of the multilayer fabric 11 comprised as mentioned above is demonstrated. For example, a multilayer woven fabric is woven by a loom having a two-layer weaving ribbon loom modified to a three-layer weaving and a wider weaving width. Also, the number of healds has been increased to allow a weave similar to double weave.

  In order to simultaneously weave three stages of the structure 12 similar to double weaving, as shown in FIG. 2, three warp beams 21, 22, and 23 are arranged in three stages up and down. Inserting (wefting) wefts U1y, U2y, M1y, M2y, L1y, and L2y for each opening of warps U1x to U4x, M1x to M4x, and L1x to L4x sent from the respective warp beams 21 to 23 through the back roller 24. To be done. Wefts U1y, U2y inserted into the upper (upper) warp openings, wefts M1y, M2y inserted into the middle (middle) warp openings, and wefts L1y, L2y inserted into the lower (lower) warp openings Are inserted by the same weft insertion mechanism (not shown). That is, the number of weft insertion mechanisms is half the number of layers of the multilayer fabric 11.

  The combined yarns 13a and 13b are sent out from the beam 25 having the same configuration as the warp beams 21 to 23 through the back roller 24 of the middle warp beam 22. The total number of the binding yarns 13a and 13b is arranged at regular intervals so as to be the same number as each warp U1x. The binding yarns 13a and 13b are composed of six layers of healds 29a and 29b that are driven independently from the helds 26a to 26d, 27a to 27d, and 28a to 28d that open the warps U1x to U4x, M1x to M4x, and L1x to L4x. It is arranged in a folded shape so as to connect the woven fabric 12. The reed 30 is disposed between the heald 26a for the warp U1x and the pre-weaving 31.

  The healds 29a and 29b for moving the binding yarns 13a and 13b are disposed on the opposite side to the pre-weaving 31 with respect to the heald 28d for the warp L4x. The healds 29a and 29b move the connecting yarns 13a and 13b so that the insertion of the wefts U1y and U2y and the wefts L1y and L2y into the openings of the warps U1x to U4x and the openings of the warps L1x to L4x is not hindered. That is, the healds 29a and 29b are reciprocated so that the engaging portions (held eyes) with the connecting yarns 13a and 13b are reciprocated above the openings of the warps U1x to U4x and below the openings of the warps L1x to L4x. It is configured. The eyes of the heald are indicated by black circles in the figure (the same applies to other healds).

  As shown in FIG. 2, first, each warp U1x, M1x, L1x of the upper layer, middle layer and lower layer is arranged on the upper side, and the other warps U2x to U4x, M2x to M4x, L2x to L4x are arranged on the lower side. Helds 26a-26d, 27a-27d, 28a-28d are arranged. Further, the engaging portion of the heald 29a for the connecting yarn 13a with the connecting yarn 13a is arranged above the opening of the warp yarns U1x and U2x, and the engaging portion of the heald 29b for the connecting yarn 13b with the connecting yarn 13b is The wefts U1y, M1y, L1y are inserted into the openings of the warps U1x, U2x, etc. in a state of being arranged below the openings of the warps L1x, L2x.

  Next, after the beating operation of the reed 30 is performed, the healds 26b, 27b, 28b for the warps Y2x, M2x, L2x and the helds 26c, 27c, 28c for the warps U3x, M3x, L3x are driven, respectively. The opening state is changed. Further, the healds 29a, 29b are driven, and the engaging portion of the heald 29b with the connecting yarn 13b is disposed above the opening of the warps U3x, U4x, and the engaging portion of the heald 29a with the connecting yarn 13a is the warp L3x. , L4x are arranged below the openings. In this state, wefts U2y, M2y, and L2y are inserted into the respective warp openings, resulting in the state shown in FIG. Thereafter, the hammering operation of the hammer 30 is performed.

  Next, the healds 26a, 27a, and 28a for the warps U1x, M1x, and L1x and the healds 26c, 27c, and 28c for the warps U3x, M3x, and L3x are driven to change the opening state. In addition, the healds 29a and 29b are driven and the engaging portions of the heald 29a with the connecting yarn 13a are arranged above the openings of the warps U1x and U2x, and the engaging portions of the heald 29b with the connecting yarn 13b are the warps L1x. , L2x. In this state, the wefts U1y, M1y, and L1y are inserted into the respective warp openings, resulting in the state shown in FIG. Thereafter, the hammering operation of the hammer 30 is performed.

  Next, the healds 26a, 27a, and 28a for the warps U1x, M1x, and L1x and the healds 26d, 27d, and 28d for the warps U4x, M4x, and L4x are driven to change the opening state. Further, the healds 29a, 29b are driven, and the engaging portion of the heald 29b with the connecting yarn 13b is disposed above the opening of the warps U3x, U4x, and the engaging portion of the heald 29a with the connecting yarn 13a is the warp L3x. , L4x are arranged below the openings. In this state, wefts U2y, M2y, and L2y are inserted into the respective warp openings, resulting in the state shown in FIG. Thereafter, the hammering operation of the hammer 30 is performed.

  Next, the healds 26b, 27b, and 28b for the warps U2x, M2x, and L2x and the healds 26d, 27d, and 28d for the warps U4x, M4x, and L4x are driven to change the opening state. In addition, the healds 29a and 29b are driven and the engaging portions of the heald 29a with the connecting yarn 13a are arranged above the openings of the warps U1x and U2x, and the engaging portions of the heald 29b with the connecting yarn 13b are the warps L1x. , L2x. In this state, wefts U1y, M1y, L1y are inserted into the respective warp openings, and the state shown in FIG. 2 is obtained.

  Hereinafter, in the same manner as described above, the insertion of the wefts U1y, M1y, L1y of the upper layer, the middle layer, and the lower layer woven structure 12, the insertion of the wefts U2y, M2y, L2y, the corresponding beating operation, and the change of the opening state Are performed sequentially. And the multilayer fabric 11 of the structure shown to Fig.1 (a) is manufactured.

  The multilayer fabric 11 configured as described above is used, for example, as a friction material of a clutch in an automatic transmission for a vehicle in a state where the resin is cured while being impregnated with a phenol resin that is a thermosetting resin.

  As shown in FIG. 6, when the friction material is formed, an annular friction material 16 is punched and formed by pressing from a sheet 15 which is an intermediate product formed by impregnating and curing a multilayer resin 11 with a phenol resin. . The resin does not block the space of the multilayer fabric 11, but adheres around the fibers, and the friction material 16 is formed in a state where air permeability is ensured.

  The friction material 16 configured as described above is held in a state where one surface presses the mating member, and acts to suppress relative movement between the mating member and the surface by friction between the surface and the mating member. Since the woven structure 12 is formed of a thin fiber bundle and has a high weave density, the contact area is increased and the coefficient of friction is increased as compared with the case where a thick fiber bundle is used. Get higher.

This embodiment has the following effects.
(1) Weft structures 12 woven with warps and wefts arranged to form at least a double weave are arranged in a plurality of layers, and adjacent wefts U1y, U2y, M1y, M2y, L1y constituting the woven structure 12 , L2y, and a plurality of layers of the weaving structure 12 are connected by connecting yarns 13a and 13b arranged so as to be folded back in the thickness direction of the fabric. Therefore, delamination of the multiple layers of woven structure 12 is prevented. Further, since the woven fabric is woven in the same manner as the double weaving, the multilayer woven fabric 11 can be woven with a loom equipped with a weft insertion mechanism that has fewer layers than the multilayer woven fabric 11. In addition, the weft yarns arranged in the overlapping state in the thickness direction without the binding yarns 13a and 13b are not arranged in the overlapping state in the thickness direction due to the presence of the binding yarns 13a and 13b, and the thickness of the fabric. It arrange | positions in the state which shifted | deviated to the direction and the arrangement direction of warp. Therefore, the weft as a whole is densely arranged as compared to the case of a normal double-woven fabric without the binding yarns 13a and 13b, the cushioning property is improved, and the slippage between layers due to shearing force is less likely to occur. Increases the shape stability of the fabric.

  (2) The woven structure 12 is composed of only warps and wefts having a structure corresponding to double weaving. Therefore, the multilayer fabric 11 can be woven with a loom equipped with a weft insertion mechanism that is half the number of layers of the multilayer fabric 11.

(3) Three sets of layers corresponding to the double weave are provided, and the multilayer fabric 11 has six weft layers. Therefore, it is easy to obtain the multilayer fabric 11 having an appropriate cushioning property.
(4) Since the binding yarns 13a and 13b are arranged so as to pass through all the layers of the woven fabric 12 and be folded back in the thickness direction of the multilayer fabric 11, the healds 29a, The driving method of 29b is simplified.

(5) Since each woven structure 12 is formed in the same manner, the multilayer fabric 11 can be used without checking the front and back.
(6) The friction material 16 is manufactured by impregnating and curing the thermosetting resin on the multilayer fabric 11 having the above-described configuration. Therefore, the durability of the friction material 16 is improved and the cushioning property is also improved.

(7) When the fiber constituting the multilayer fabric 11 is a carbon fiber, the heat resistance of the friction material 16 manufactured from the multilayer fabric 11 is improved, and when the fiber is an aramid fiber, the wear resistance is improved.
The embodiment is not limited to the above, and may be configured as follows, for example.

  ○ Instead of arranging the binding yarns 13a and 13b to be folded back at the front and back surfaces of the multilayer fabric 11, the binding yarn 13a corresponds to the upper weft U1y and the middle weft M2y as shown in FIG. The binding yarn 13b may be folded back at a position corresponding to the middle weft M1y and the lower weft L2y. Further, as shown in FIG. 7B, the connecting yarn 13a is arranged to be folded back at a position corresponding to the upper weft U1y and the middle weft M2y, and the connecting yarn 13b corresponds to the lower weft L1y and the middle weft M2y. It is good also as the arrangement | positioning which folds in a position. In the configuration in which the binding yarns 13a and 13b are folded back at the front and back surfaces of the multilayer fabric 11, when one of the binding yarns 13a and 13b is cut, the tightening force on the entire wefts arranged in the thickness direction is weakened. However, in the configuration where the middle layer is folded back, even if one of the binding yarns 13a and 13b is cut, a tightening force for the weft on the opposite side of the middle layer is ensured.

  ○ The multi-layer fabric 11 has a double woven layer, not an upper layer, a middle layer, and a lower layer, but a two-layer structure of an upper layer and a lower layer as shown in FIG. 8 (a), or as shown in FIG. 8 (b). Thus, a single layer structure may be used. Moreover, it is good also considering a double woven layer as four or more layers.

  ○ In the woven structure 12 constituting the multi-layered fabric 11, in addition to the warp and weft arranged so as to constitute a double weave, the woven structure 12 formed by the warp and weft constituting a normal plain weave is added. May be. The woven structure 12 composed of a normal plain weave may be disposed on the surface of the multilayer fabric 11 or may be disposed inside. Further, the number of layers is not limited to one, but a plurality of layers may be provided. However, in the case of providing a plurality of layers, it is easier to weave by substituting with the woven structure 12 constituting a double weave.

  The multilayer fabric 11 is not limited to the method of use as the friction material 16 and may be used as a filter, for example. When used as a filter, the thickness of the fiber bundle constituting the warp, the weft and the binding yarn, the weave density of the woven structure, or the number of layers is set according to the size of the foreign matter to be collected.

  O It is not necessary to form all the warps, wefts, and binding yarns constituting the multilayer fabric 11 with fiber bundles of the same material. For example, a fiber bundle of the same material may be used for the binding yarn and the warp, and a fiber bundle of a different material may be used for the weft.

  〇 Warp yarns, weft yarns and binding yarns do not have to use fiber bundles having the same thickness, and fiber bundles having different thicknesses may be used. When changing the thickness of the fiber bundle, the thickness of the filament itself may be changed without changing the number of filaments constituting the fiber bundle.

  ○ When the multilayer fabric 11 is used after being impregnated and cured with resin, it is better to use untwisted fiber bundles (multifilaments) for the warp, weft and binding yarns that make up the multilayer fabric 11. It is preferable because the impregnation is easily performed uniformly. However, when used in the state of the multilayer fabric 11 without impregnating the resin, for example, when used as a filter, it is preferable from the viewpoint of durability to use a twisted yarn instead of an untwisted fiber bundle.

  As a loom for weaving the multilayer fabric 11, the binding yarns 13a and 13b may be fed out from the warp beam using the warp beam without providing the beam 25 for the binding yarns 13a and 13b. In this case, the warp yarn and the binding yarn are different in the length of the fiber bundle fed out from one beat to the next beat, and therefore it is necessary to provide separate tension adjusting devices.

  In the above-described embodiment, the warp beams 21 to 23 are provided corresponding to each pair constituting the double weave, but the number of warp beams does not need to be the number of each pair constituting the double weave. It is possible to weave the multi-layer fabric 11 even if all warps constituting the multi-layer fabric 11 are fed out from one warp beam.

The following technical idea (invention) can be understood from the embodiment.
(1) In the invention according to any one of claims 1 to 4, the binding yarns are arranged so as to be folded back through all the layers of the woven structure constituting the multilayer fabric.

  (2) In the invention according to any one of claims 1 to 4, three sets of layers corresponding to the double weave are provided, and the binding yarn is provided from one surface side of the multilayer fabric. And those arranged so as to fold through the layers up to the second set and those arranged so as to fold through the layers up to the second set from the other surface side of the multilayer fabric.

(A) is a schematic diagram showing the structure of a multilayer woven fabric, (b) is a schematic diagram showing the structure when warp, weft, and binding yarn constituting the multilayer woven fabric are arranged without being beaten, (c) Fig. 2 is a schematic diagram showing a configuration of a normal double weave without a binding yarn. The schematic diagram which shows the weaving state of a multilayer fabric. The schematic diagram which shows the weaving state of a multilayer fabric. The schematic diagram which shows the weaving state of a multilayer fabric. The schematic diagram which shows the weaving state of a multilayer fabric. The model perspective view of the state which stamped out the friction material from the sheet-like intermediate product. (A), (b) is a schematic diagram which shows the structure of the multilayer fabric in another embodiment. (A), (b) is a schematic diagram which shows the structure of the multilayer fabric in another embodiment.

Explanation of symbols

  L1y, L2y, M1y, M2y, U1y, U2y ... weft, L1x, L2x, L3x, L4x, M1x, M2x, M3x, M4x, U1x, U2x, U3x, U4x ... warp, 11 ... multi-layer fabric, 12 ... weave structure, 13a, 13b ... binding yarns, 16 ... friction material.

Claims (6)

  Thickness of the woven fabric so that a woven structure woven with at least warps and wefts arranged to form a double weave is arranged in a plurality of layers and passes between adjacent wefts constituting the woven structure. A multi-layered fabric in which a plurality of layers of weaving structures are joined by binding yarns arranged so as to be folded in the direction.   Of the warp and weft arranged to constitute the double weave, the warp constituting the upper layer of the pair of double weave is arranged to pass above the weft constituting the lower layer. The warp yarn constituting the lower layer of the double weave is arranged so as to pass below the weft yarn constituting the upper layer, and the weft yarn constituting the upper layer and the weft yarn constituting the lower layer are The multilayer fabric according to claim 1, wherein the binding yarns are alternately arranged in a state where movement of warps in the arrangement direction is restricted by the binding yarns.   The multilayer fabric according to claim 1 or 2, wherein the woven structure is composed of only warps and wefts corresponding to a double weave.   The multilayer fabric according to any one of claims 1 to 3, wherein a plurality of sets of layers corresponding to the double weave are provided.   A friction material formed by impregnating and curing a thermosetting resin on the multilayer fabric according to any one of claims 1 to 4 and applying an outer shape process.   The filter comprised by the multilayer fabric as described in any one of Claims 1-4.

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