JP2013057143A - Woven fabric base material and fiber-reinforced composite material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a woven fabric base material which is free from crimping of reinforcing fibers and excellent in shape retainability and shape formability so as to be suitable as a reinforcing fiber base material for a fiber-reinforced composite material.SOLUTION: A woven fabric base material 10 comprises: a plurality of reinforcing fiber warp yarns 11 which comprise fiber bundles and are arranged in parallel to each other; and a plurality of reinforcing fiber weft yarns 12 which comprise fiber bundles and are arranged in parallel to each other and in a direction intersecting the reinforcing fiber warp yarns 11. Auxiliary weft yarns 13, which comprise finer yarns than the reinforcing fiber weft yarns 12 and extend in the same direction as the reinforcing fiber weft yarns 12, are arranged on the side opposite to the reinforcing fiber weft yarns 12 with respect to the reinforcing fiber warp yarns 11. Auxiliary warp yarns 14a and 14b, which comprise finer yarns than the reinforcing fiber warp yarns 11, extend in the same direction as the reinforcing fiber warp yarns 11 and are each arranged between the reinforcing fiber warp yarns 11 in such a manner that turned-back portions in engagement with the reinforcing fiber weft yarns 12 are intermingled with turned-back portions in engagement with the auxiliary weft yarns 13.

Description

  The present invention relates to a textile substrate and a fiber reinforced composite material.

  A fiber reinforced composite material is used as a lightweight, high-strength material. The fiber-reinforced composite material is preferable as a structural component because the mechanical properties (mechanical properties) are improved as compared with the matrix itself when the reinforcing fibers are compounded in a matrix of resin or metal. In particular, a fiber reinforced plastic (hereinafter, also referred to as FRP) using a resin as a matrix is preferable because the weight can be further reduced.

  As a woven fabric base material used for FRP, a woven fabric woven with plain weave, twill weave, satin weave or the like is used as a cloth material. The cloth material forms a crimp (bent state) at the intersection between the warp and the weft. When viewed with respect to one reinforcing fiber in the FRP, the reinforcing fiber is crimped at each intersection with the other reinforcing fiber. It will be in the state arranged in the matrix in the state which exists. As a result, it is pointed out that the strength and rigidity of the reinforcing fiber cannot be fully utilized, and the strength and rigidity are reduced due to the crimping of the reinforcing fiber.

  Conventionally, a multiaxial molding material (commonly referred to as “multiaxial woven fabric”) has been proposed as a reinforcing fiber base without crimping of reinforcing fibers, which is a drawback of cloth materials (see, for example, Patent Document 1). In the multiaxial molding material of Patent Document 1, at least two sheets in which a large number of reinforcing fiber yarns are arranged in parallel are laminated so that the reinforcing fiber yarns intersect to form a laminate, The laminate is integrated by stitch yarn. That is, in a multiaxial fabric, warp, weft, and oblique direction reinforcing fibers are arranged without crossing each other to form a warp layer, a weft layer, and an oblique direction yarn layer, and the reinforcing fibers in each layer are stitch yarns. And are integrated with each other.

  Further, a fabric structure for composite materials has also been proposed as a reinforcing fiber base without crimping of reinforcing fibers (see Patent Document 2). As shown in FIG. 6, the fabric structure for a composite material of Patent Document 2 includes two groups of yarns composed of straight reinforcing fiber yarns 51 and 52 that are not bent in a sheet shape in one direction. A and B are included. The two yarn groups A and B have sheet-like surfaces facing each other, and the reinforcing fiber yarn 51 of one yarn group A intersects the reinforcing fiber yarn 52 of the other yarn group B. In this state, the auxiliary fiber yarns 53 and 54 are integrally held.

JP 2007-182065 A Japanese Patent Laid-Open No. 55-30974

  In general, the reinforcing fiber base is rarely used in the form of a flat plate, and the resin is impregnated and cured in a state of being formed into a desired shape to form a fiber-reinforced composite material. In the multiaxial woven fabric described in Patent Document 1, a plurality of sheets in which a large number of reinforcing fiber yarns are arranged in parallel are laminated and stitched with stitch yarns, so that reinforcing fibers (reinforcing fiber yarns) The movement of the is poor (flexibility is poor) and inferior in formability compared to the cloth material.

  On the other hand, the fabric structure for composite material described in Patent Document 2 does not use a stitch yarn, and an auxiliary fiber yarn 53 that functions as a warp of a general fabric, and an auxiliary fiber yarn 54 that functions as a weft. Because of the configuration that maintains the shape of the fabric structure, the formability is better than when stitched yarn is used. However, in the woven fabric of Patent Document 2, the reinforcing fiber yarns 52 and the auxiliary fiber yarns 54 constituting the weft yarn are alternately arranged. Therefore, when the auxiliary fiber yarn 53 is tensioned, the reinforcing fibers The gaps between the yarns 52 are opened, and a gap is formed between the reinforcing fiber yarns 52. In the case of FRP, the resin-rich portion exists in a linear shape, which is disadvantageous in strength.

  The present invention has been made in view of the above-mentioned problems, and a first object thereof is a reinforcing fiber base material of a fiber-reinforced composite material that has no crimp of reinforcing fibers and has good shape retention and formability. It is in providing the textile base material suitable for. Another object of the present invention is to provide a fiber-reinforced composite material in which a reinforcing fiber substrate is used as a woven fabric substrate that does not have reinforcing fiber crimps and has good shape retention and formability.

  In order to achieve the first object, the invention according to claim 1 is characterized in that a plurality of reinforcing fiber warps composed of fiber bundles and arranged in parallel to each other, and parallel to each other and the warp yarns for reinforcing fibers composed of fiber bundles. A plurality of reinforcing fiber wefts arranged in a direction intersecting with the reinforcing fiber, and a thread thinner than the reinforcing fiber weft, extending in the same direction as the reinforcing fiber weft and the reinforcing fiber with respect to the reinforcing fiber warp An auxiliary weft arranged on the opposite side of the weft for use, and a thread thinner than the warp for reinforcing fiber, extends in the same direction as the warp for reinforcing fiber and arranged between the warps for reinforcing fiber, and the reinforcing And auxiliary warps arranged in a mixed state of folding in a state of being engaged with a weft for fibers and folding in a state of being engaged with the auxiliary weft. Here, “warp yarn for reinforcing fiber” means a warp that plays a role of reinforcing a matrix of a composite material when a woven fabric base material is used as a reinforcing fiber substrate of the composite material. The term “weft” means a weft that plays a role of reinforcing the matrix of the composite material when the woven base material is used as the reinforcing fiber base material of the composite material. In addition, “auxiliary warp” and “auxiliary weft” are the same as the warp and weft of a general woven fabric. This means a yarn having a function to prevent turbulence and deformation of the woven fabric (textile base material). “Auxiliary warp” and “auxiliary weft” themselves contribute to the mechanical strength of the composite material. There is no necessity. Further, the “auxiliary warp” and “auxiliary weft” are not limited to those composed of a bundle of a plurality of fibers but also include one filament.

  In the woven fabric base material of the present invention, when the fiber reinforced composite material is constituted, the warp yarns for reinforcing fibers and the weft yarns for reinforcing fibers that function as reinforcing fibers are arranged without crimping at the intersections. It is possible to develop strength and rigidity, which are characteristics that should be achieved. Further, since the auxiliary warp and auxiliary weft constituting the woven fabric structure do not need to function as reinforcing fibers when the fiber reinforced composite material is constituted, thin yarns can be used. For this reason, the warp for reinforcing fibers and the weft for reinforcing fibers are looser and easier to move than the configuration in which stitching is performed with stitch yarns, and the shapeability is improved. Further, since the auxiliary wefts are arranged on the opposite side of the reinforcing fiber warp with respect to the reinforcing fiber warp, unlike the configuration of Patent Document 2, it is possible to prevent the wefts from being opened even if tension is applied to the auxiliary warp. Thus, when the gap between the wefts is not expanded and the fiber reinforced composite material is used, the resin rich portion does not exist in a linear shape, and the strength reduction is prevented. Therefore, the present invention can provide a woven fabric base material that is free from crimping of reinforcing fibers, has good shape retention and formability, and is suitable as a reinforcing fiber base material for fiber-reinforced composite materials.

  The invention according to claim 2 is the invention according to claim 1, wherein a plurality of the auxiliary warps are arranged between the adjacent warps for reinforcing fibers, and at least one of the plurality of auxiliary warps is The at least one other fiber is arranged so that the fold-back positions with respect to the reinforcing fiber weft or the auxiliary weft are opposite to each other. The fabric base material of the present invention has a stronger structure than the fabric base material having a configuration in which one auxiliary warp is arranged between adjacent warp yarns for reinforcing fibers, and the fabric base material can be easily handled.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the wefts for reinforcing fibers are arranged so as to form an angle of 90 ° with the warps for reinforcing fibers. When weaving the textile substrate of the present invention, it can be handled by a simple modification of a conventional loom. Further, by using two woven fabric substrates of the present invention and using one of the woven fabric substrates in a state where the arrangement direction of the reinforcing fibers is deviated by 45 ° with respect to the other woven fabric substrate, the fiber orientation A pseudo-isotropic fiber-reinforced composite material having reinforcing fiber layers arranged at angles of 0 °, 90 °, + 45 °, and −45 ° can be easily obtained.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the auxiliary weft is the opposite side of the weft for reinforcing fiber to the warp for reinforcing fiber. They are arranged within the width of the reinforcing fiber weft.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the warp for reinforcing fibers and the weft for reinforcing fibers have a thickness of 100 to 1600 tex, The auxiliary warp and the auxiliary weft have a thickness of 1/10 or less of the warp for reinforcing fiber and the weft for reinforcing fiber.

  The thicknesses of the reinforcing fiber warp and the reinforcing fiber weft are set in accordance with the required performance. For example, among carbon fibers used as reinforcing fibers for fiber reinforced composite materials, commercially available long-fiber (filament) aggregate PAN-based carbon fibers include 1K, 3K, 6K, 12K, and 24K. Is 800 tex at 12K. 1K means 1000 filaments. In this invention, since the thickness of the warp for reinforcing fiber and the weft for reinforcing fiber is in the above range, for example, when carbon fiber is used as the warp for reinforcing fiber and the weft for reinforcing fiber, it is easy to obtain commercially available carbon fiber.

  In order to achieve the second object, the fiber-reinforced composite material of the invention described in claim 6 is composed of a plurality of warp fibers for reinforcing fibers that are made of fiber bundles and arranged in parallel with each other, and fiber bundles that are parallel to each other. And a plurality of reinforcing fiber wefts arranged in a direction intersecting with the reinforcing fiber warp, and a thread thinner than the reinforcing fiber weft, extending in the same direction as the reinforcing fiber weft and reinforcing the reinforcing fiber The auxiliary warp arranged on the opposite side of the weft for reinforcing fiber with respect to the warp for fiber, and a thread thinner than the warp for reinforcing fiber, and extends in the same direction as the warp for reinforcing fiber and the warp for reinforcing fiber A woven fabric base material comprising an auxiliary warp arranged in a state of being mixed together and folded in a state of being engaged with the weft for reinforcing fiber and being folded in a state of being engaged with the auxiliary weft Resin Immersed was composed.

  In the fiber-reinforced composite material of the present invention, the warp for reinforcing fiber and the weft for reinforcing fiber functioning as the reinforcing fiber are arranged in a straight state without crimping at the intersection, so that the reinforcing fiber has a characteristic that should be originally expressed. A certain strength and rigidity can be expressed. The woven fabric base material used as the reinforcing fiber base is shaped by the warp for the reinforcing fiber and the weft for the reinforcing fiber is looser and easier to move than the configuration in which the warp for the reinforcing fiber and the weft for the reinforcing fiber are stitched with the stitch yarn. Will be better. Further, in the woven fabric base, even when tension is applied to the auxiliary warp, the opening between the wefts is suppressed, the gap between the wefts does not expand, and when the fiber reinforced composite material is used, the resin-rich portion exists linearly. It does not become a state and prevents strength reduction. Therefore, handling of the textile base material when manufacturing the fiber reinforced composite material becomes easy.

  ADVANTAGE OF THE INVENTION According to this invention, there is no crimp of a reinforced fiber, Moreover, the form retention property and shapeability are good, and the textile base material suitable for the reinforced fiber base material of a fiber reinforced composite material can be provided.

(A) is a schematic perspective view of the textile base material of 1st Embodiment, (b) is a schematic cross section of a textile base material. The schematic side view which shows a weaving state. (A) is a schematic perspective view of the textile base material of 2nd Embodiment, (b) is a schematic cross section of a textile base material. The model perspective view which shows the relationship between the heald at the time of weaving of the textile base material of 2nd Embodiment, and the warp for reinforcement fibers. The schematic perspective view of the textile base material of another embodiment. The schematic perspective view of the fabric structure for composite materials of a prior art.

(First embodiment)
A first embodiment embodying the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 (a) and 1 (b), a woven fabric base 10 includes a plurality of reinforcing fiber warps 11 as reinforcing fibers, a plurality of reinforcing fiber wefts 12 as reinforcing fibers, and auxiliary wefts 13; And auxiliary warp yarns 14a and 14b. The “reinforcing fiber” means a fiber bundle that plays a role of reinforcing the matrix of the composite material when the woven base material 10 is used as the reinforcing fiber base material of the composite material. The plurality of reinforcing fiber warps 11 are made of fiber bundles and arranged straight in parallel with each other, and the plurality of reinforcing fiber wefts 12 are also made of fiber bundles and arranged in parallel with each other and in a direction intersecting with the reinforcing fiber warps 11. Has been. The reinforcing fiber wefts 12 are arranged so as to form an angle of 90 ° with the reinforcing fiber warps 11.

  Carbon fibers are used for the warp yarns 11 for reinforcing fibers and the weft yarns 12 for reinforcing fibers. Depending on the required performance of the composite material, for example, a carbon fiber with a T700 T700 filament count and a thickness of 800 tex was used. The reinforcing fiber warp 11 and the reinforcing fiber weft 12 constitute the woven fabric base 10 in a state where the carbon fiber is opened. The “opened state” means that the interval between fibers constituting the fiber bundle is widened and the fiber bundle becomes flat.

  The auxiliary wefts 13 are made of threads that are thinner than the wefts for reinforcing fibers, extend in the same direction as the wefts 12 for reinforcing fibers, and are arranged on the opposite side of the wefts 12 for reinforcing fibers with respect to the warp yarns 11 for reinforcing fibers. The opposite side of the reinforcing fiber weft 12 means being positioned within the width of the reinforcing fiber weft 12. The auxiliary warps 14a and 14b are made of a thread thinner than the reinforcing fiber warp 11, extend in the same direction as the reinforcing fiber warp 11, and are arranged between the reinforcing fiber warps 11, and include the reinforcing fiber weft 12 and the auxiliary weft. 13 are arranged in a state where the folding in the state intersecting with the weft 12 for reinforcing fibers and the folding in the state engaged with the auxiliary weft 13 are mixed. In this embodiment, the auxiliary warps 14 a and 14 b are alternately arranged one by one between the adjacent reinforcing fiber warps 11. For the auxiliary weft 13 and the auxiliary warps 14a and 14b, nylon or polyester yarn having a thickness of about 10 tex is used.

  Next, the manufacturing method of the textile base material 10 comprised as mentioned above is demonstrated. The weaving of the woven base material 10 can be performed by a simple modification of a conventional plain weaving machine having two heald frames (rib frames) for opening the auxiliary warps 14a and 14b, for example. Specifically, the reinforcing fiber weft 12 and the auxiliary weft 13 are inserted into the same opening of the auxiliary warps 14a and 14b.

  As shown in FIG. 2, the loom has a reinforcing fiber warp beam 21 for supplying the reinforcing fiber warp 11, an auxiliary warp beam 22 for supplying the auxiliary warp 14a, and an auxiliary warp beam 23 for supplying the auxiliary warp 14b. It is arranged in three stages up and down. The reinforcing fiber warp 11 is horizontally fed out from the reinforcing fiber warp beam 21, and the auxiliary warp 14a fed out from one auxiliary warp beam 22 is opened by the heald 24 of one heald frame, while the other auxiliary warp. The auxiliary warp 14b delivered from the beam 23 is opened by the heald 25 of the other heald frame. The eyes of healds 24 and 25 are indicated by black circles in the figure. The heel 30 is disposed between the heald 24 and the weave 31.

  Reinforcing fiber weft 12 is weft-inserted by a weft insertion mechanism (not shown) above reinforcing fiber warp 11 with respect to the openings of auxiliary warps 14a, 14b, and auxiliary weft 13 is against the openings of auxiliary warps 14a, 14b. Thus, the weft insertion mechanism (not shown) is inserted below the reinforcing fiber warp 11.

  When weaving the textile substrate 10 with the above-mentioned loom, the ends of the auxiliary warp yarns 14a and 14b drawn out from the reinforcing fiber warp yarn 11 and the auxiliary warp yarns 22 and 23 are wound up. Weaving is started from a state of being fixed to a roll (not shown). By moving the two heald frames alternately in the vertical direction, each heald 24 supported by one heald frame and each heald 25 supported by the other heald frame are moved in opposite directions. The auxiliary warps 14a and 14b are alternately opened up and down alternately, and the reinforcing fiber weft 12 and the auxiliary weft 13 are inserted into the warp opening 16 formed each time.

  The reinforcing fiber weft 12 is inserted above the reinforcing fiber warp 11 in the warp opening 16, and the auxiliary weft 13 is inserted below the reinforcing fiber warp 11 in the warp opening 16. After the weft 12 for reinforcing fiber and the auxiliary weft 13 are inserted and the hammer 30 is hammered, the healds 24 and 25 are moved in the opposite direction to change the opening state, and the next weft insertion operation Is done. These operations are repeated to weave the woven base material 10 and wind it up on a winding roll.

  After the fabric base material 10 is formed in a state of being laminated in a plurality of layers and formed into a preform, for example, a liquid thermosetting resin before curing is impregnated and cured by an RTM method to form a fiber-reinforced composite material. Is done. When producing a quasi-isotropic fiber reinforced composite material, it is necessary to form a quasi-isotropic fiber substrate to form a preform. In the woven fabric base 10, the reinforcing fiber warp 11 and the reinforcing fiber weft 12 intersect at an angle of 90 °, and the two woven fabric substrates 10 intersect the reinforcing fiber warp 11 at an angle of 45 °. By laminating with, a pseudo-isotropic reinforcing fiber substrate in which reinforcing fibers are arranged at 0 °, 90 °, + 45 °, and −45 ° can be configured. Further, by laminating two unidirectional woven fabrics having a fiber bundle orientation angle of 45 ° and one woven fabric base material 10, the reinforcing fibers are arranged at 0 °, 90 °, + 45 °, and −45 °. A pseudo-isotropic reinforcing fiber substrate can be formed.

According to this embodiment, the following effects can be obtained.
(1) The woven fabric base 10 is composed of a plurality of reinforcing fiber warps 11 made of fiber bundles and arranged in parallel to each other, and a plurality of fibers made of fiber bundles arranged in parallel to each other and intersecting the reinforcing fiber warps 11. And a weft 12 for reinforcing fibers. Therefore, when the woven fabric substrate 10 is used as a reinforcing fiber substrate of a fiber reinforced composite material, strength and rigidity, which are characteristics that the reinforcing fiber should originally express, can be expressed.

  (2) The woven fabric base 10 is made of a thread thinner than the reinforcing fiber weft 12, is made of an auxiliary weft 13 extending in the same direction as the reinforcing fiber weft 12, and a thread thinner than the reinforcing fiber warp 11, and is made of reinforcing fiber. Auxiliary warps 14a and 14b extending in the same direction as the warp 11 are provided. The auxiliary wefts 13 are arranged on the side opposite to the reinforcing fiber wefts 12 with respect to the reinforcing fiber warps 11, the auxiliary warps 14 a and 14 b are arranged between the reinforcing fiber warps 11, and the reinforcing fiber wefts 12. Are arranged in a mixed state of folding in the engaged state with the auxiliary weft 13 and folding in the engaged state with the auxiliary weft 13. Since the auxiliary warp yarns 14a and 14b and the auxiliary weft yarn 13 constituting the woven fabric structure do not need to function as reinforcing fibers when the fiber reinforced composite material is constituted, thin yarns can be used. For this reason, the warp 11 for reinforcing fibers and the weft 12 for reinforcing fibers are looser and easier to move than the configuration in which stitching is performed with stitch yarns, and the shapeability is improved. In addition, since the auxiliary weft 13 is arranged on the opposite side of the reinforcing fiber weft 12 with respect to the reinforcing fiber warp 11, it is possible to prevent the weft from being opened even if tension is applied to the auxiliary warps 14a and 14b. When the gap between the wefts does not widen and a fiber reinforced composite material is used, the resin-rich portion does not exist in a linear shape, and strength reduction is prevented. Therefore, the fabric base material 10 is a fabric base material 10 that is free from crimping of reinforcing fibers, has good shape retention and shapeability, and is suitable as a reinforcing fiber base material for fiber-reinforced composite materials.

(3) The warp yarns 11 for reinforcing fibers and the weft yarns 12 for reinforcing fibers are made of carbon fibers, and can be easily obtained by selecting the thickness from commercially available carbon fibers.
(4) The reinforcing fiber wefts 12 are arranged so as to form an angle of 90 ° with the reinforcing fiber warps 11. Therefore, when weaving the woven base material 10, it can be handled by a simple modification of a conventional loom. Further, by using two woven fabric base materials 10 and laminating and using one woven fabric base material 10 in a state where the arrangement direction of the reinforcing fibers is shifted by 45 ° with respect to the other woven fabric base material 10, A pseudo-isotropic fiber-reinforced composite material having reinforcing fiber layers arranged at angles of 0 °, 90 °, + 45 °, and −45 ° can be easily obtained.

  (5) The auxiliary warps 14a and 14b are alternately arranged one by one between the adjacent reinforcing fiber warps 11. Therefore, as a warp opening device of a loom for weaving the woven base material 10, a general plain loom device that alternately moves up and down adjacent warps with two heald frames can be used.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. The fabric base material 10 of this embodiment is different from the first embodiment in the arrangement state of the auxiliary warps 14a and 14b, and the other configurations are the same as those of the first embodiment. Similar parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, the auxiliary warps 14a and the auxiliary warps 14b are alternately arranged between the adjacent reinforcing fiber warps 11. In this embodiment, as shown in FIGS. 3A and 3B, the auxiliary warps 14 a and 14 b constituting the woven fabric base 10 are composed of two auxiliary warps 14 a and 14 b between the adjacent reinforcing fiber warps 11. 14b are arranged so that the folding positions with respect to the reinforcing fiber weft 12 or the auxiliary weft 13 are opposite to each other. That is, the reinforcing fiber weft 12 and the auxiliary weft 13 are two auxiliary warps located in a plane perpendicular to the arrangement surface of the reinforcing fiber weft 12 and the auxiliary weft 13 between the adjacent reinforcing fiber warps 11. It becomes the structure hold | maintained by 14a, 14b.

  The loom for weaving the woven base material 10 includes two heald frames (rib frames) for opening the auxiliary warp yarns 14a and 14b as in the conventional plain weaving loom. However, as shown in FIG. 4, the healds 24 and 25 of each heald frame are adjacent to each other so that the auxiliary warps 14 a and the auxiliary warps 14 b form warp openings between the same adjacent reinforcing fiber warps 11. It is comprised so that it may move up and down within one plane between the warp yarns 11 for fibers. Therefore, when the number of reinforcing fiber warps 11 is the same, the number of auxiliary warps 14a and 14b is twice that of the first embodiment.

According to this 2nd Embodiment, in addition to the effect similar to (1)-(4) of 1st Embodiment, the following effects can be acquired.
(6) The auxiliary warp yarns 14a and 14b constituting the woven fabric substrate 10 have two auxiliary warp yarns 14a and 14b between the adjacent reinforcing fiber warp yarns 11, and the return position relative to the reinforcing fiber weft yarn 12 or the auxiliary weft yarn 13 is They are arranged so that they are opposite to each other. Therefore, the structure becomes stronger than the fabric base 10 having a configuration in which one auxiliary warp is arranged between adjacent warp yarns 11 for reinforcing fibers, and a molding die for forming the fabric base 10 into a preform. It becomes easy to handle such as housing in a mold or housing in a mold for impregnating and curing a matrix resin.

The embodiment is not limited to the above, and may be embodied as follows, for example.
○ In the woven fabric base material 10, it is not necessary that at least one of the auxiliary warps 14a and 14b be arranged between the adjacent reinforcing fiber warps 11, for example, the auxiliary warps 14a are arranged as shown in FIG. A location, a location where the auxiliary warps 14a and 14b are not arranged, and a location where the auxiliary warps 14b are arranged may be repeated.

  ○ In the configuration in which two auxiliary warps 14a and 14b are arranged between adjacent reinforcing fiber warps 11 as in the second embodiment, a place where the two auxiliary warps 14a and 14b are arranged; It is good also as a structure by which the place where the auxiliary warp yarns 14a and 14b are not arranged is repeated alternately. Moreover, it is good also as a structure where the location where the auxiliary warps 14a and 14b are not arranged and the location where the two auxiliary warps 14a and 14b are arranged exist at random. In these cases, even if the total number of the auxiliary warps 14a and 14b is the same as that in the first embodiment, the effect of maintaining the shape of the fabric base 10 by the auxiliary warps 14a and 14b is higher than that in the first embodiment.

The fabric base 10 may have a configuration in which the number of auxiliary warps 14a and 14b arranged between adjacent reinforcing fiber warps 11 is one and two locations.
A plurality of auxiliary warp yarns 14a and 14b are arranged between adjacent reinforcing fiber warp yarns 11, and at least one of the plurality of auxiliary warp yarns 14a and 14b is a reinforcing fiber weft yarn 12 with respect to at least one other. Alternatively, the auxiliary wefts 13 may be arranged so that the folding positions with respect to the auxiliary wefts 13 are opposite to each other, and the number of auxiliary warps 14a and 14b may be three or more.

  In the woven fabric base 10, the angle formed by the reinforcing fiber weft 12 and the reinforcing fiber warp 11 is not limited to 90 °, and may be another angle. For example, the angle formed by the reinforcing fiber weft 12 and the reinforcing fiber warp 11 may be 45 °.

  ○ The fiber bundles constituting the warp yarn 11 for reinforcing fibers and the weft yarn 12 for reinforcing fibers are not limited to carbon fibers, and aramid fibers, poly-p-phenylenebenzobisoxazole fibers corresponding to the physical properties required for fiber reinforced composite materials Further, high-strength organic fibers such as ultrahigh molecular weight polyethylene fibers, and inorganic fibers such as glass fibers and ceramic fibers may be used. For example, when glass fiber is used, the cost is reduced because the glass fiber is less expensive than the carbon fiber.

  The warp yarn 11 for reinforcing fibers and the weft yarn 12 for reinforcing fibers are not limited to about 600 tex in thickness. Depending on the required performance of the fiber reinforced composite material, the number of carbon fibers of 3K to 24K is used, and the thickness is approximately 100 to 1600 tex depending on the type of carbon fiber. Note that the density of carbon fiber filaments varies within a range of about 10 to 20%, and the diameter varies within a range of about 50%, so even the same number of carbon fibers can vary in thickness expressed by tex. Yes.

The auxiliary weft 13 and the auxiliary warps 14a and 14b are not limited to nylon or polyester yarns, and may be fiber bundles of carbon fibers or glass fibers.
When nylon or polyester yarn is used as the auxiliary weft 13 and the auxiliary warp yarns 14a and 14b, the thickness is about tens of deniers to about 1500 deniers. When converted to texes, the thickness is about several texes to about 160 texes. That is, the thickness of the auxiliary weft 13 and the auxiliary warps 14a and 14b is 1/10 or less of the warp 11 for reinforcing fibers and the weft 12 for reinforcing fibers. The auxiliary weft 13 and the auxiliary warps 14a and 14b do not need to function as reinforcing fibers in a state in which the fabric base 10 constitutes a fiber reinforced composite material, and thus the shape of the fabric base 10 is maintained in the state of the fabric base 10. The thinner one is preferable as long as it is possible.

O When using the textile base material 10 as a reinforced fiber base material of a fiber reinforced composite material, there is no restriction | limiting in particular in the kind of matrix resin, or the manufacturing method of a fiber reinforced composite material.
○ In the case where a resin is impregnated and cured by the RTM method on the woven base material 10, after the woven base material 10 is pre-shaped into a preform, it is not arranged in a mold for impregnating and hardening the resin, The material 10 may be shaped while being placed in the mold.

  The warp yarns 11 for reinforcing fibers and the weft yarns 12 for reinforcing fibers may be arranged in a curved state instead of being arranged straight in the state of the woven fabric substrate 10. Even when the reinforcing fiber warp yarn 11 and the reinforcing fiber weft yarn 12 are curved at the stage of manufacturing the woven fabric base material 10, the reinforcing fiber warp yarn 11 and the reinforcing fiber weft yarn 12 are arranged in a straight line. By impregnating and curing the resulting resin, in the state of the fiber-reinforced composite material, the warp yarns 11 for reinforcing fibers and the weft yarns 12 for reinforcing fibers can be arranged in a straight line.

The following technical idea (invention) can be understood from the embodiment.
(1) Between the adjacent warps for reinforcing fibers, there are alternately places where the auxiliary warps are arranged and places where the auxiliary warps are not arranged. Item 10. A textile substrate according to item.

(2) A preform comprising the textile substrate according to any one of claims 1 to 5 and the technical idea (1).
(3) A fiber-reinforced composite material comprising the woven fabric substrate according to any one of claims 1 to 5 and the technical ideas (1) and (2) as a reinforced fiber substrate.

  DESCRIPTION OF SYMBOLS 10 ... Textile base material, 11 ... Warp for reinforcement fiber, 12 ... Weft for reinforcement fiber, 13 ... Auxiliary weft, 14a, 14b ... Auxiliary warp

Claims (6)

A plurality of warp yarns for reinforcing fibers made of fiber bundles and arranged in parallel with each other;
A plurality of weft yarns for reinforcing fibers which are made of fiber bundles and arranged in parallel to each other and in a direction intersecting with the warp yarns for reinforcing fibers;
An auxiliary weft consisting of a thread thinner than the reinforcing fiber weft, extending in the same direction as the reinforcing fiber weft and arranged on the opposite side of the reinforcing fiber weft with respect to the reinforcing fiber warp;
The reinforcing fiber warp is made of a thread that is thinner than the reinforcing fiber warp, extends in the same direction as the reinforcing fiber warp, and is arranged between the reinforcing fiber warps. A woven fabric base material comprising auxiliary warp yarns arranged in a mixed state of folding when engaged with auxiliary weft yarns.   A plurality of the auxiliary warp yarns are arranged between the adjacent warp yarns for reinforcing fibers, and at least one of the plurality of auxiliary warp yarns is relative to at least one of the reinforcing fiber weft yarns or the auxiliary weft yarns. The textile base material according to claim 1, wherein the folding positions are arranged so as to be opposite to each other.   The fabric substrate according to claim 1 or 2, wherein the reinforcing fiber wefts are arranged so as to form an angle of 90 ° with the reinforcing fiber warps.   4. The auxiliary weft according to claim 1, wherein the auxiliary weft is arranged within the width of the reinforcing fiber weft on the side opposite to the reinforcing fiber weft with respect to the reinforcing fiber warp. 5. Woven textile substrate.   The warp for reinforcing fiber and the weft for reinforcing fiber have a thickness of 100 to 1600 tex, and the auxiliary warp and the auxiliary weft have a thickness of 1/10 of the warp for reinforcing fiber and the weft for reinforcing fiber. It is the following, The textile base material given in any 1 paragraph of Claims 1-4. A plurality of warp yarns for reinforcing fibers which are made of fiber bundles and arranged straight in parallel with each other;
A plurality of weft yarns for reinforcing fibers which are made of fiber bundles and arranged in parallel to each other and straight in the direction intersecting with the warp yarns for reinforcing fibers;
An auxiliary weft consisting of a thread thinner than the reinforcing fiber weft, extending in the same direction as the reinforcing fiber weft and arranged on the opposite side of the reinforcing fiber weft with respect to the reinforcing fiber warp;
The reinforcing fiber warp is made of a thread that is thinner than the reinforcing fiber warp, extends in the same direction as the reinforcing fiber warp, and is arranged between the reinforcing fiber warps. A fiber-reinforced composite material obtained by impregnating a fabric base material with an auxiliary warp arranged in a mixed state of folding in a state of being engaged with auxiliary wefts.

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