JP2018165421A - Composite reinforcing fiber sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the deformability of a reinforcing fiber sheet when it receives an external force. A reinforcing fiber sheet is: a first reinforcing fiber layer having parallel first strands; a second reinforcing fiber layer having a second strand facing the first strand; a third strand oriented to intersect the first strand. It is provided with a third reinforcing fiber layer; which is located between the first and second reinforcing fiber layers. The first and second strands are not joined to the third strand, but are joined to each other between the plurality of third strands. In adjacent sheets: The first strand of the second sheet is parallel to the third strand of the first sheet; there is a third strand of the first sheet between the plurality of first strands of the second sheet. The first strand of the second sheet and the second strand of the first sheet facing each other are joined between the plurality of third strands of the first and second sheets. [Selection diagram] FIG. 12

Description

  The present disclosure relates to a reinforcing fiber sheet, and particularly to a reinforcing fiber sheet suitable for RTM molding.

  Conventionally, so-called RTM (Resin Transfer Molding) is known as a molding method of fiber reinforced plastics (also referred to as “FRP”) having excellent productivity. In RTM, a base laminate made of reinforcing fiber fabric is placed in a mold, a matrix resin is injected into the mold, the base laminate is impregnated, the resin is cured, Demold.

  In general, a preform is produced by shaping a substrate laminate (for example, a plurality of reinforcing fiber substrates) formed into a flat plate into a predetermined shape. Then, the preform is placed in a mold, a matrix resin is injected into the mold, and the resin impregnated in the base material is cured.

  Examples of the reinforcing fiber fabric used in the RTM include a woven fabric and a non-crimp fabric (sometimes referred to as “NCF”). In the woven fabric, a fabric form is formed by weaving the warp and weft of the reinforcing fiber bundle. On the other hand, in NCF, two or more layers of reinforcing fiber bundles arranged in one direction are laminated and joined in the thickness direction using a stitch yarn or a resin binder to form a fabric form. .

  The difference in the characteristics of the reinforcing fiber fabric caused by the difference in the form of these fabrics includes the ease of shear deformation of the reinforcing fiber fabric when subjected to an external force. In the woven fabric, each reinforcing fiber bundle is not joined to another reinforcing fiber bundle, and external force is propagated between the reinforcing fiber bundles due to friction at the mutual contact portion. For this reason, the woven fabric can be subjected to shear deformation in a plane defined by the warp and the weft.

  On the other hand, in NCF, each reinforcing fiber bundle is joined with another reinforcing fiber bundle, and the reinforcing fiber bundles are restrained. When subjected to a shearing force, the NCF deforms while twisting in the vicinity of the joint. For this reason, NCF is less susceptible to shear deformation in a plane defined by warps and wefts, compared to woven fabrics. Therefore, particularly when producing a preform having a complicated shape, a woven fabric having a fabric form excellent in deformability is suitable.

  These reinforcing fiber fabrics are continuously produced in a constant width by a loom or warp knitting machine, wound around a roll, held, and conveyed. For this reason, when manufacturing the said preform, a reinforced fiber fabric is pulled out from a roll only by the required quantity, it cuts into a desired shape, and is laminated | stacked.

  However, in the above-described method, a large amount of scrap material is generated after the reinforcing fiber fabric having a product shape is cut out from the reinforcing fiber fabric having a certain width (that is, substantially rectangular), and the waste amount of the reinforcing fiber is increased. For this reason, the above method has a problem of high manufacturing cost.

  Therefore, instead of cutting out a reinforcing fiber fabric having a product shape from a reinforcing fiber fabric having a certain width (that is, a substantially rectangular shape), a fiber place in which reinforcing fiber bundles are sequentially arranged at necessary locations in accordance with the product shape from the beginning. Ment method is attracting attention. According to the fiber placement method, the amount of scrap material discarded can be greatly reduced.

  When a preform is generated by the fiber placement method, (i) a three-dimensional base material laminate (preform) is obtained by directly attaching a reinforcing fiber bundle to a mold having a three-dimensional shape. And (ii) a method for producing a planar reinforcing fiber sheet and laminating the sheet to form a substrate laminate, and then shaping the sheet to obtain a three-dimensional preform. It has been.

  When a reinforcing fiber bundle is directly attached to a mold having a three-dimensional shape, for example, a reinforcing fiber bundle having tackiness is directly placed on the mold, and the reinforcing fiber layer is fixed to the mold and formed into a molded product shape. I will do it. For this reason, the process of producing a preform by shaping is unnecessary. However, when arranging the reinforcing fiber bundle on the mold, it is necessary to move the head for arranging the reinforcing fiber bundle along the shape of the mold in the three-dimensional space. For this reason, there are the following problems. That is, when the shape of the mold is complicated, the reinforcing fiber bundle arrangement head and the mold interfere with each other, and therefore the reinforcing fiber bundle may not be arranged. Further, when the shape of the mold is complicated, the reinforcing fiber bundle cannot be arranged at high speed, and the productivity is low.

  On the other hand, in the case of producing a planar sheet, the following processing is performed. A reinforcing fiber bundle having tackiness or a dry (that is, having no tackiness) reinforcing fiber bundle is arranged in a planar and desired two-dimensional shape along one direction to form one reinforcing fiber layer. . At that time, adjacent reinforcing fiber bundles are restrained. And a plurality of the above-mentioned reinforced fiber layers are laminated, and the layers are restrained. As a result, a sheet form, that is, a flat substrate laminate is formed. In this technique, since the reinforcing fiber bundle placement head does not need to move three-dimensionally, the reinforcing fiber bundle can be placed at high speed. However, as a post-process, a step of forming a flat substrate laminate and manufacturing a preform is required.

  As described above, the fiber placement method sequentially arranges the reinforcing fiber bundles at necessary locations in accordance with the shape of the product. Therefore, in order to obtain a reinforcing fiber fabric having a desired shape, the fiber placement method can start from the reinforcing fiber fabric having a rectangular shape. There is no need to separate the material. Therefore, the fiber placement method has a feature that the amount of waste can be significantly reduced. However, since the fiber placement method is a method in which reinforcing fiber bundles are sequentially arranged, there is a limit to the sheet form that can be manufactured. That is, the reinforcing fiber fabric produced by the fiber placement method cannot take a sheet form of a woven structure in which reinforcing fibers intersect three-dimensionally, such as a woven fabric. For this reason, the sheet | seat manufactured by the fiber placement method is restrict | limited to the form which joined the reinforcing fiber bundle | flux in the thickness direction using the stitch yarn or the resin binder etc. like NCF. Therefore, the reinforcing fiber sheet produced by the fiber placement method has a problem that it is difficult to undergo shear deformation in a plane when subjected to an external force.

  As means for solving these problems, attempts have been made to improve the deformability of the reinforcing fiber sheet manufactured in the form of a non-crimp fabric. For example, when joining two or more layers of reinforcing fiber layers aligned in one direction in the thickness direction with stitch yarn, the type of stitch yarn and stitch pattern can be selected to improve the ease of sheet deformation. Has been proposed (see Patent Document 1). In this method, the ease of deformation of the sheet can be controlled in accordance with the necessity of deformation by controlling the degree of restraint of the sheet by the stitch yarn.

  In addition, a technique has been proposed in which a plurality of laminated base materials are integrated in the thickness direction with stitch yarns, and the stitch yarns are partially cut (see Patent Document 2). In this method, the stitch yarn is partly cut while giving a certain restraint with the stitch yarn in the thickness direction of the laminated base material. Therefore, by controlling the cutting condition of the stitch yarn, it is possible to meet the need for deformation. The ease of deformation of the sheet can be controlled.

Special table 2011-530014 gazette JP 2007-092232 A

  In the technique of Patent Document 1 that improves the deformability by loosening the restraint of the sheet by the stitch yarn, the reinforcing fiber bundle is easily deformed while twisting when subjected to an external force, but the shear deformation of the entire sheet is sufficient. It cannot be improved. Also, in the technique of Patent Document 2, when an external force is applied, the reinforcing fiber bundle is easily deformed while twisting, but the shear deformability of the entire sheet cannot be sufficiently improved. Therefore, the reinforcing fiber sheet manufactured by the fiber placement method still has room for improvement with respect to the deformability when subjected to external force.

  This indication is made in order to solve at least one part of the above-mentioned subject, and can be realized as the following forms.

(1-1) According to one aspect of the present invention, a composite reinforcing fiber sheet including a plurality of reinforcing fiber sheets is provided. Each of the plurality of reinforcing fiber sheets includes: a plurality of first strands arranged substantially parallel to each other, and a first reinforcing fiber layer located on one surface of the reinforcing fiber sheet; A plurality of second strands arranged substantially parallel to each first strand so as to face each other, and a second reinforcing fiber layer positioned on the other surface of the reinforcing fiber sheet; A plurality of third strands arranged substantially in parallel so as not to overlap each other in a direction crossing the strands, and located between the first reinforcing fiber layer and the second reinforcing fiber layer And one or more third reinforcing fiber layers.
The plurality of first strands and the plurality of second strands are not joined to the plurality of third strands, but are joined to each other at a plurality of portions between the plurality of third strands. .
Among the plurality of reinforcing fiber sheets, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other: the direction of the plurality of first strands of the second reinforcing fiber sheet is the first Substantially parallel to the direction of the plurality of third strands of the reinforcing fiber sheet; as viewed from the stacking direction, so as to be positioned between the plurality of first strands of the second reinforcing fiber sheet The plurality of third strands of the first reinforcing fiber sheet are arranged.
The plurality of first strands of the second reinforcing fiber sheet and the plurality of second strands of the first reinforcing fiber sheet facing each other are the plurality of second strands of the second reinforcing fiber sheet. Are joined to each other at a plurality of sites between the three strands and between the plurality of third strands of the first reinforcing fiber sheet.

According to such an aspect, the plurality of first strands of the second reinforcing fiber sheet and the plurality of third strands of the first reinforcing fiber sheet are arranged substantially in parallel, and are spaced from each other. Therefore, the composite reinforcing fiber sheet having a good appearance can be configured. Furthermore, the molded article obtained by RTM molding using the composite reinforcing fiber sheet can suppress a local deterioration in physical properties due to the local lack of reinforcing fibers.
In addition, each reinforcing fiber sheet may have different deformation characteristics in the longitudinal direction of the first and second strands and in the longitudinal direction of the third strand. However, in a composite reinforcing fiber sheet including the first and second reinforcing fiber sheets arranged as described above, such anisotropy is reduced.

(1-2) In the composite reinforcing fiber sheet of the above aspect, the width of the second strand is 0.8 to 1.2 times the width of the first strand, and the width of the third strand is The aspect may be 0.8 to 1.2 times the width of the first strand.
According to such an aspect, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other, the plurality of first and second strands of the second reinforcing fiber sheet having substantially the same width as each other; The plurality of third strands of the first reinforcing fiber sheet are alternately arranged. As a result, a composite reinforcing fiber sheet having a beautiful appearance and / or surface property can be formed.

(1-3) In the composite reinforcing fiber sheet of the above aspect, in one of the reinforcing fiber sheets: the plurality of first strands and the plurality of second strands have a width of 1.8 of the first strand. It is arranged with a pitch of ~ 2.2 times; the plurality of third strands may be arranged with a pitch of 1.8 to 2.2 times the width of the third strand. .
According to such an aspect, the plurality of first strands of the second reinforcing fiber sheet having substantially the same width as each other and the plurality of third strands of the first reinforcing fiber sheet complement each other's gap. To be arranged. As a result, a composite reinforcing fiber sheet having a beautiful appearance and / or surface property can be formed.

(1-4) In the composite reinforcing fiber sheet of the above aspect, among the plurality of reinforcing fiber sheets, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other, the second reinforcing fiber sheet The plurality of first strands and the plurality of third strands of the first reinforcing fiber sheet may be arranged at an equal pitch.
By setting it as such an aspect, the 1st strand of the 2nd reinforcing fiber sheet and the 3rd strand of the 1st reinforcing fiber sheet which are arranged in parallel alternately can be arranged at the same pitch. it can. Therefore, a composite reinforcing fiber sheet having a beautiful appearance and / or surface property can be formed.

(1-5) In the composite reinforcing fiber sheet of the above aspect, among the plurality of reinforcing fiber sheets, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other, the second reinforcing fiber sheet The total value of the width | variety of a 1st strand and the width | variety of the said 3rd strand of a said 1st reinforcement fiber sheet | seat can be set as the aspect which is 95 to 100% of the said equal pitch.
By setting it as such an aspect, the area | region in a composite reinforcement fiber sheet is substantially covered with the 1st strand of the 2nd reinforcement fiber sheet and the 3rd strand of a 1st reinforcement fiber sheet which are located in a line in parallel. And a composite reinforcing fiber sheet having a beautiful appearance and / or surface texture can be formed.

(1-6) In the composite reinforcing fiber sheet of the above aspect, among the plurality of reinforcing fiber sheets, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other, the second reinforcing fiber sheet A plurality of third strands and the plurality of first strands of the first reinforcing fiber sheet may be arranged at an equal pitch.
By setting it as such an aspect, the 3rd strand of the 2nd reinforcing fiber sheet and the 1st strand of the 1st reinforcing fiber sheet which are arranged in parallel alternately can be arranged at the same pitch. it can. Therefore, a composite reinforcing fiber sheet having a beautiful appearance and / or surface property can be formed.

(1-7) In the composite reinforcing fiber sheet of the above aspect, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other among the plurality of reinforcing fiber sheets, the second reinforcing fiber sheet The total value of the width | variety of a 3rd strand and the width | variety of the said 1st strand of a said 1st reinforcement fiber sheet can be set as the aspect which is 95 to 100% of the said equal pitch.
By setting it as such an aspect, the area | region in a composite reinforcing fiber sheet is substantially covered with the 3rd strand of the 2nd reinforcing fiber sheet and the 1st strand of a 1st reinforcing fiber sheet which are located in a line in parallel. And a composite reinforcing fiber sheet having a beautiful appearance and / or surface texture can be formed.

(2-1) According to one aspect of the present invention, a reinforcing fiber sheet is provided. The reinforcing fiber sheet includes: a plurality of first strands arranged substantially parallel to each other, and a first reinforcing fiber layer located on one surface of the reinforcing fiber sheet; and a plurality of fibers arranged substantially parallel to each other A second reinforcing fiber layer provided on the other surface of the reinforcing fiber sheet; a plurality of third strands arranged substantially parallel to each other so as not to overlap each other; And one or more third reinforcing fiber layers positioned between the second reinforcing fiber layer and the second reinforcing fiber layer. The size of the angle formed by the third strand and the first strand is closer to 90 degrees than the size of the angle formed by the second strand and the first strand. The plurality of first strands and the plurality of second strands are not joined to the plurality of third strands, but are joined to each other at a plurality of portions between the plurality of third strands. Yes.
According to such an embodiment, the third strand is in the third reinforcing fiber layer and in the direction perpendicular to the longitudinal direction of the third strand, the first strand and the second strand are mutually connected. The position is constrained by a plurality of joined portions. And a 3rd strand is distribute | arranged to the position between a 1st strand and a 2nd strand about the thickness direction of a reinforcing fiber sheet. The plurality of third strands are arranged so as not to overlap each other, and are not joined to the first strand and the second strand. For this reason, the plurality of third strands can be relatively displaced in the longitudinal direction. The plurality of third strands can be inclined with respect to the first strand and the second strand. Therefore, when the reinforcing fiber sheet receives a shearing force acting in the plane of the sheet, the plurality of third strands are displaced from each other, so that the relative position of the plurality of third strands is fixed in the reinforcing fiber sheet. Compared to the embodiment, the shear deformation can be performed more easily.

(2-2) In the reinforcing fiber sheet of the above aspect, each of the first strands and each of the second strands may be arranged in parallel and facing each other. In such an aspect, the plurality of sets of the first strand and the second strand that are joined to each other can be relatively displaced in the longitudinal direction. Accordingly, when the reinforcing fiber sheet receives a shearing force acting in the plane of the sheet, the plurality of sets of the first and second strands are displaced from each other, so that the reinforcing fiber sheet has the first and second properties. Compared with an aspect in which the relative positions of a plurality of sets of strands are fixed, shear deformation can be performed more easily.

(2-3) In the reinforcing fiber sheet of the above aspect, the plurality of third reinforcing fiber layers are provided, and the plurality of third strands provided in the plurality of third reinforcing fiber layers are substantially parallel to each other. It can be set as the aspect arranged. If it is set as such an aspect, the some 3rd strand of a some 3rd reinforcement fiber layer can be displaced relatively about a longitudinal direction, without inhibiting mutual displacement. Therefore, when the reinforcing fiber sheet receives a shearing force acting in the plane of the sheet, the reinforcing fiber sheet is compared with an aspect in which the plurality of third strands of the plurality of third reinforcing fiber layers are not substantially parallel to each other. Can be sheared more easily.

(2-4) In the reinforcing fiber sheet of the above aspect, the plurality of portions where the plurality of first strands and the plurality of second strands are joined are formed of one third reinforcing fiber layer. It can be set as the aspect arranged in parallel with the direction of the plurality of third strands. If it is such an aspect, compared with the aspect in which the some site | part to which the 1st and 2nd strand is joined is not parallel to the direction of the 3rd strand, the 3rd strand is between joining parts. In this case, the displacement in the direction perpendicular to the longitudinal direction can be greatly increased. Therefore, when the reinforcing fiber sheet receives a shearing force acting in the plane of the sheet, the reinforcing fiber sheet can be more easily deformed by shearing.

(2-5) In the reinforcing fiber sheet of the above aspect, the plurality of portions where the plurality of first strands and the plurality of second strands are bonded are in the longitudinal direction of the first strand. It can be set as the aspect arrange | positioned at equal intervals. If it is set as such an aspect, compared with the aspect in which the some site | part to which the 1st and 2nd strand is joined is not equal intervals about the longitudinal direction of the 1st and 2nd strand, it is several 3rd. The strands can be displaced to the same extent in the direction perpendicular to the longitudinal direction between the joining sites. Therefore, when the reinforcing fiber sheet receives a shearing force acting in the plane of the sheet, the reinforcing fiber sheet can be more easily deformed by shearing.

(2-6) In the reinforcing fiber sheet of the above aspect, the plurality of first strands and the plurality of second strands may be joined with a resin binder.

  The present invention can also be realized in various forms other than the reinforcing fiber sheet. For example, it is realizable with forms, such as a manufacturing method of a reinforced fiber sheet, and a fiber reinforced resin molding manufactured using a reinforced fiber sheet.

  According to the present disclosure, a reinforcing fiber sheet having good shear deformability when subjected to an external force can be obtained.

It is sectional drawing which shows typically the reinforced fiber sheet 100 which concerns on one embodiment of this indication. It is a top view showing typically reinforced fiber sheet 100 concerning one embodiment of this indication. It is a top view which shows the mode of the shear deformation | transformation when the reinforced fiber sheet 100 which concerns on this indication receives the external force of an in-plane direction. It is a top view showing typically reinforced fiber sheet 300 concerning other embodiments of this indication. It is a top view showing typically reinforced fiber sheet 400 concerning other embodiments of this indication. It is sectional drawing which shows typically the reinforcing fiber sheet 500 which concerns on the other embodiment of this indication. It is a top view showing typically reinforced fiber sheet 500 concerning other embodiments of this indication. It is sectional drawing which shows typically the reinforcing fiber sheet 100A which concerns on one embodiment of this indication. It is a top view showing typically reinforcing fiber sheet 100A concerning one embodiment of this indication. It is sectional drawing which shows typically the reinforced fiber sheet 100B which concerns on one embodiment of this indication. It is a top view showing typically reinforced fiber sheet 100B concerning one embodiment of this indication. It is explanatory drawing seen from the lamination direction of the reinforcing fiber sheet which shows the structure of the composite reinforcing fiber sheet.

A. Embodiment:
The reinforcing fiber sheet of the present disclosure is a reinforcing fiber sheet in which at least three reinforcing fiber layers arranged in one direction are stacked and a part of the layers is bonded, and is a reinforcing fiber sheet that satisfies the following conditions.

A) The outermost layers are at least partially joined.
B) There is a gap between the strands of the inner layer.
C) The joining position of the outermost layer is included in the gap position of the inner layer.

  Below, the form for implementing the reinforcing fiber sheet of this indication is explained, referring to drawings.

A1. First embodiment:
FIG. 1 is a cross-sectional view schematically showing a reinforcing fiber sheet 100 according to an embodiment of the present disclosure. FIG. 2 is a plan view schematically showing the reinforcing fiber sheet 100 according to an embodiment of the present disclosure. The reinforcing fiber sheet 100 is formed by laminating at least three reinforcing fiber layers. Each of the reinforcing fiber layers 101, 102, and 103 includes a plurality of reinforcing fiber bundles (hereinafter referred to as “strands”) aligned in one direction. The width of the strand in each layer is substantially constant. The outermost reinforcing fiber layers are shown as reinforcing fiber layers 101 and 102. That is, the reinforcing fiber layers 101 and 102 are located on the surface of the reinforcing fiber sheet 100. A reinforcing fiber layer as an inner layer located between the reinforcing fiber layers 101 and 102 is shown as a reinforcing fiber layer 103.

  The angle formed by the strand 103s of the reinforcing fiber layer 103 and the strand 101s of the reinforcing fiber layer 101 is 90 degrees (see FIG. 2). In addition, in this specification, the magnitude | size of the angle which two strands make is a magnitude | size of the smaller angle of the two angles which two strands make. The direction of one strand is defined by a straight line connecting the central points in the width direction of the strands at both ends of the strand.

  The angle formed by the strand 102s of the reinforcing fiber layer 102 and the strand 101s of the reinforcing fiber layer 101 is zero. That is, the strand 102s and the strand 101s are arranged in parallel to each other (see FIG. 2). Each strand 102s of the reinforcing fiber layer 102 and each strand 101s of the reinforcing fiber layer 101 are arranged so as to face each other (see FIG. 2). That is, the strand 102s and the strand 101s are arranged at the same position in the longitudinal direction (vertical direction in FIG. 2) of the strand 103s. A pair of strands 101s and 102s facing each other is referred to as a strand pair 107s.

  The strands 103s of the reinforcing fiber layer 103 have a gap 104 therebetween. That is, the strands 103s of the reinforcing fiber layer 103 are arranged so as not to overlap each other. The strands 101 s and 102 s of the outermost reinforcing fiber layers 101 and 102 are joined to each other at a plurality of portions 105. The part 105 to be joined is preferably circular. When viewed along the laminating direction of the reinforcing fiber layers 101, 102, 103, in the longitudinal direction of the strands 101s, 102s of the reinforcing fiber layers 101, 102 (the left-right direction in FIGS. 1 and 2), It is included in the range of the gap 104 of the reinforcing fiber layer 103 (see FIG. 2).

  In the reinforcing fiber sheet 100, the strands 103s of the inner reinforcing fiber layer 103 are not joined to the strands 101s and 102s of the outermost reinforcing fiber layers 101 and 102. That is, the strands 103 s of the reinforcing fiber layer 103 are only in contact with the strands 101 s and 102 s of the outermost reinforcing fiber layers 101 and 102. As a result, the strand 103s and the strands 101s and 102s are independent of each other.

  On the other hand, among the strands of the outermost reinforcing fiber layers 101 and 102, a pair of strands 107 s which are a pair of strands 101 s and 102 s facing each other are joined at a part 105. However, one strand pair 107s is not joined to the other strand pair 107s.

  FIG. 3 is a plan view showing a state of shear deformation when the reinforcing fiber sheet 100 according to the present disclosure receives an external force in the in-plane direction. As a result of having the above-described configuration, when the reinforcing fiber sheet 100 receives an external force 106 which is a shearing force along the direction of the surface of the reinforcing fiber sheet 100, the plurality of strands of the reinforcing fiber layer 103 are relatively Can be displaced. Further, the plurality of strand pairs 107s of the reinforcing fiber layers 101 and 102 can also be relatively displaced. The plurality of strands of the reinforcing fiber layer 103 and the plurality of strand pairs 107s of the reinforcing fiber layers 101 and 102 propagate external force due to friction at the contact portions. For this reason, the reinforcing fiber sheet 100 can be shear-deformed in the entire fabric without interference between the fiber bundles. That is, the reinforcing fiber sheet 100 according to the present disclosure has a non-crimp structure in which a plurality of layers composed of a plurality of strands aligned in one direction are stacked (see FIGS. 1 to 3), but undergoes shear deformation similar to a woven fabric. can do.

  Here, examples of the reinforcing fibers used in the reinforcing fiber layers 101, 102, and 103 include carbon fibers, glass fibers, aramid fibers, metal fibers, alumina fibers, and silicon nitride fibers. In particular, since the molded body can be further reduced in weight, carbon fibers are preferably used as the reinforcing fibers used in the reinforcing fiber layers 101, 102, and 103.

  Moreover, as a strand used in the reinforcing fiber layers 101, 102, 103, a strand composed of a plurality of types of reinforcing fibers or synthetic fibers of reinforcing fibers and organic fibers can also be used. Examples of organic fibers used in this case include polyamide-based synthetic fibers, polyolefin-based synthetic fibers, polyester-based synthetic fibers, polyphenylsulfone-based synthetic fibers, polybenzoxazine-based synthetic fibers, acetates, acrylonitrile-based synthetic fibers, and modacrylic fibers. , Polyvinyl chloride synthetic fiber, polyvinylidene chloride synthetic fiber, polyvinyl alcohol synthetic fiber, polyurethane fiber, polyclar fiber, protein-acrylonitrile copolymer fiber, fluorine fiber, polyglycolic acid fiber, phenol fiber, and para fiber Examples include aramid fiber.

  The number of single fibers of the reinforcing fiber constituting the strand is preferably 3000 to 60000, and more preferably 10,000 to 60000. The thinner the strand, the closer the shape of the reinforcing fiber layer can be to the desired shape in accordance with the product shape when manufacturing the sheet with fiber placement, and the amount of discarded fibers can be reduced. On the other hand, the thinner the strands, the more strands are arranged. As a result, the arrangement of the strands takes time, and the productivity is lowered.

  As the strand, for example, a strand that has been subjected to pretreatment such as sizing treatment, fiber opening treatment, and binder application can be used. For example, by performing sizing treatment, it is possible to improve the convergence of the strands and suppress the generation of fluff. Further, by performing the fiber opening treatment, the ratio of the thickness and width (aspect ratio) of the strands can be adjusted and set to an aspect ratio suitable for the conditions of the subsequent preform process and RTM molding process. . Furthermore, by applying a pretreatment such as binder application, the adhering state between the strands can be made uniform.

  The reinforcing fiber layer 101 of the present embodiment corresponds to the “first reinforcing fiber layer” in [Means for Solving the Problems]. The strand 101s included in the reinforcing fiber layer 101 corresponds to the “first strand”. The reinforcing fiber layer 102 corresponds to the “second reinforcing fiber layer”. The strands 102s included in the reinforcing fiber layer 102 correspond to the “second strand”. The reinforcing fiber layer 103 corresponds to a “third reinforcing fiber layer”. The strand 103s included in the reinforcing fiber layer 103 corresponds to the “third strand”.

A2. Second embodiment:
FIG. 4 is a plan view schematically showing a reinforcing fiber sheet 300 according to another embodiment of the present disclosure. In the reinforcing fiber sheet 300, there are two reinforcing fiber layers 303a and 303b positioned between the outermost reinforcing fiber layers 301 and 302.

  Each strand 303as of the reinforcing fiber layer 303a and each strand 303bs of the reinforcing fiber layer 303b are arranged to face each other. That is, the strand 303as and the strand 303bs are arranged at the same position in the longitudinal direction (left-right direction in FIG. 4) of the strand 301s of the outermost reinforcing fiber layer 301. The strand 303as and the strand 303bs are not joined to each other.

  By setting it as such an aspect, several strand 303as, 303bs of several reinforcement fiber layer 303a, 303b can be displaced relatively about a longitudinal direction, without inhibiting mutual displacement. Therefore, when the reinforcing fiber sheet 300 receives a shearing force acting in the plane of the sheet, the reinforcing fiber sheet is more easily shear-deformed as compared with an embodiment in which the strands 303as and 303bs are not substantially parallel to each other. Can do.

  Further, in the reinforcing fiber sheet 300, the directions of the strands 301s and 302s of the outermost reinforcing fiber layers 301 and 302 constituting the reinforcing fiber sheet are different from those of the reinforcing fiber sheet 100 of FIGS.

  The strands 301s and 302s of the reinforcing fiber layers 301 and 302 are not parallel to each other. That is, the strands 302 s of the reinforcing fiber layer 302 are arranged to form an angle of about 5 degrees with respect to the strands 301 s of the reinforcing fiber layer 301. The strands 301s of the reinforcing fiber layer 301 are arranged so as to form an angle of 90 degrees with respect to the strands 303as and 303bs of the inner reinforcing fiber layers 303a and 303b sandwiched between the reinforcing fiber layers 301 and 302. The strands 302s of the reinforcing fiber layer 302 are arranged to form an angle smaller than 90 degrees (about 85 degrees) with respect to the strands 303as and 303bs.

  In the reinforcing fiber sheet 300, one strand 302s is joined to two or more strands 301s. One strand 301s is joined to two or more strands 302s.

  The other points of the reinforcing fiber sheet 300 are the same as those of the reinforcing fiber sheet 100. That is, the strands 301 s and 302 s constituting the outermost reinforcing fiber layers 301 and 302 are joined at a plurality of facing portions 305. The joining portion 305 is located in a gap 304 in the layers of the strands 303as and 303bs of the inner reinforcing fiber layers 303a and 303b sandwiched between the reinforcing fiber layers 301 and 302. The strands 303as and 303bs are not joined to the strands 301s and 302s of the reinforcing fiber layers 301 and 302, respectively.

  The direction of the outermost fiber bundle constituting the reinforcing fiber sheet of the present disclosure is not particularly limited. For example, the orientation of the strands 301s and 302s of the outermost reinforcing fiber layers 301 and 302 may be different as in the reinforcing fiber sheet 300 of FIG. However, when the outermost layers are joined so as to straddle a plurality of strands, the joined strands are united and constrained to be difficult to shear. Further, it becomes difficult to maintain the form of the sheet. For this reason, it is particularly preferable that the fiber orientations of the outermost layers coincide (see FIG. 2).

  The reinforcing fiber layer 301 of the present embodiment corresponds to the “first reinforcing fiber layer” in [Means for Solving the Problems]. The strands 301s included in the reinforcing fiber layer 301 correspond to “first strands”. The reinforcing fiber layer 302 corresponds to the “second reinforcing fiber layer”. The strands 302 s included in the reinforcing fiber layer 302 correspond to “second strands”. The reinforcing fiber layers 303a and 303b correspond to the “third reinforcing fiber layer”. Strands 303as and 303bs included in the reinforcing fiber layers 303a and 303b correspond to “third strands”.

A3. Third embodiment:
FIG. 5 is a plan view schematically showing a reinforcing fiber sheet 400 according to another embodiment of the present disclosure. In the reinforcing fiber sheet 400, the number of the reinforcing fiber layers 403a and 403b sandwiched between the outermost reinforcing fiber layers 401 and 402 constituting the reinforcing fiber sheet, and the direction of the strand 403as of the reinforcing fiber layer 403a are shown in FIGS. Different from the two reinforcing fiber sheets 100. In FIG. 5, the reinforcing fiber layer 401 is not shown explicitly because it is the deepest layer. The reinforcing fiber layer 401 is a layer constituted by the strands 401s.

  In the reinforcing fiber sheet 400, two reinforcing fiber layers 403 a and 403 b exist between the outermost reinforcing fiber layers 401 and 402. The strands 403as and 403bs of the reinforcing fiber layers 403a and 403b are arranged so as to form an angle of about 3 degrees. The strands 403bs of the reinforcing fiber layer 403b are arranged to form an angle of 90 degrees with respect to the strands 401s and 402s of the reinforcing fiber layers 401 and 402. The strands 403as of the reinforcing fiber layer 403a are arranged to form an angle smaller than 90 degrees (about 87 degrees) with respect to the strands 401s and 402s of the reinforcing fiber layers 401 and 402.

  Other points of the reinforcing fiber sheet 400 are the same as those of the reinforcing fiber sheet 100. That is, the strands 401 s and 402 s constituting the outermost reinforcing fiber layers 401 and 402 are joined at a plurality of facing portions 405. The strands 403as and 403bs of the inner reinforcing fiber layers 403a and 403b sandwiched between the reinforcing fiber layers 401 and 402 are not joined to the strands 401s and 402s of the reinforcing fiber layers 401 and 402.

  The fiber orientation other than the outermost layer constituting the reinforcing fiber sheet of the present disclosure is not particularly limited. For example, as in the reinforcing fiber sheet 400 of FIG. 5, the directions of the strands 403as and 403bs of the reinforcing fiber layers 403a and 403b sandwiched between the outermost layers may be different. However, if the directions of the strands 403as and 403bs of the reinforcing fiber layers 403a and 403b sandwiched between the outermost layers are different, the gap 404 in the reinforcing fiber layers 403a and 403b as the inner layers is narrowed, and the adjacent in the reinforcing fiber layers 403a and 403b. It becomes easy to contact with the strand. As a result, the ease of shear deformation of the reinforcing fiber sheet 400 decreases. For this reason, it is particularly preferable that the strands of the reinforcing fiber layers 403a and 403b sandwiched between the outermost layers are parallel to each other.

  The reinforcing fiber layer 401 of the present embodiment corresponds to the “first reinforcing fiber layer” in [Means for Solving the Problems]. The strand 401s included in the reinforcing fiber layer 401 corresponds to the “first strand”. The reinforcing fiber layer 402 corresponds to the “second reinforcing fiber layer”. The strands 402s included in the reinforcing fiber layer 402 correspond to the “second strand”. The reinforcing fiber layers 403a and 403b correspond to the “third reinforcing fiber layer”. Strands 403as and 403bs included in the reinforcing fiber layers 403a and 403b correspond to “third strands”.

A4. Fourth embodiment:
FIG. 6 is a cross-sectional view schematically showing a reinforcing fiber sheet 500 according to another embodiment of the present disclosure. FIG. 7 is a plan view schematically showing a reinforcing fiber sheet 500 according to another embodiment of the present disclosure. In the reinforcing fiber sheet 500, the joining portion 505 of the strands 501s and 502s constituting the outermost reinforcing fiber layers 501 and 502 is different from the joining portion 105 of the reinforcing fiber sheet 500 of FIGS. The other points of the reinforcing fiber sheet 500 are the same as those of the reinforcing fiber sheet 100.

  In the reinforcing fiber sheet 500, the joining portion 505 of the strands 501s and 502s constituting the outermost reinforcing fiber layers 501 and 502 is the longitudinal direction of the strand 503s of the inner reinforcing fiber layer 503 sandwiched between the reinforcing fiber layers 501 and 502. Arranged along the direction. A plurality of joining portions 505 arranged along the longitudinal direction of the strand 503s are indicated by a region 506 surrounded by a broken line in FIG. The joining portion 505 disposed between the adjacent strands 503s and 503s of the reinforcing fiber layer 503 is disposed in parallel with the strand 503s of the reinforcing fiber layer 503.

  When the joining site 505 is randomly arranged between adjacent strands 503s and 503s of the reinforcing fiber layer 503 (see FIG. 2), the direction perpendicular to the longitudinal direction of the strands of the reinforcing fiber layer 503 (FIGS. 6 and 7). In the left and right direction), the shortest distance between the strand 503s of the reinforcing fiber layer 503 and the arbitrary joining portion 505 in the adjacent gap 504 becomes small. That is, there is less room for the strands 503s of the reinforcing fiber layer 503 to be displaced in a direction perpendicular to the longitudinal direction. As a result, the ease of shear deformation of the reinforcing fiber sheet decreases.

  On the other hand, in the reinforcing fiber sheet 500, the joining portion 505 of the strands 501s and 502s constituting the outermost reinforcing fiber layers 501 and 502 is an inner reinforcing fiber layer 503 sandwiched between the reinforcing fiber layers 501 and 502. It is arranged along the longitudinal direction. In other words, the shortest distance between the strand 503s of the reinforcing fiber layer 503 and the arbitrary joining portion 505 in the adjacent gap 504 is maximized. For this reason, there is a large room for the strand 503s of the reinforcing fiber layer 503 to be displaced in a direction perpendicular to the longitudinal direction. As a result, the reinforcing fiber sheet 500 is easily sheared.

  Further, in the strand pair 507s that is a pair of strands 501s and 502s facing each other, the joining portions 505 are arranged at equal intervals except for the portions at both ends. And the junction site | part 505 is distribute | arranged between all the adjacent strands 503s and 503s. In such a mode, the plurality of strands 503s are connected to the bonding site 505 in comparison with the mode in which the plurality of portions 505 to which the strands 501s and 502s are joined are not equally spaced in the longitudinal direction of the strands 501s and 502s. In the meantime, they can be displaced to the same extent in the direction perpendicular to the longitudinal direction (left-right direction in FIG. 7). Therefore, when the reinforcing fiber sheet 500 receives a shearing force acting in the plane of the sheet, it can be uniformly sheared as a whole.

  In addition, it is preferable that the space | interval of the arrangement | sequence of the some area | region 506 extended along the longitudinal direction of the reinforcing fiber layer 503 is uniform, and is larger than 1.2 times the width | variety of the strand 503s of the reinforcing fiber layer 503. More preferably, the interval between the plurality of regions 506 is larger than 1.5 times the width of the strand 503s of the reinforcing fiber layer 503. When the distance between the regions 506 is less than 1.2 times the width of the strands of the reinforcing fiber layer 503, the strands 503s of the reinforcing fiber layer 503 can easily come into contact with the adjacent strands 503s, and the shearing deformation of the reinforcing fiber sheet 500 is easy. The reason for this is to decrease. In the present specification, the “width” of the strand is a dimension in a direction perpendicular to the longitudinal direction of the strand when the strand is viewed along the lamination direction of the reinforcing fiber sheet. The “interval” between the areas is the distance between the closest points included in each area.

  The reinforcing fiber layer 501 of the present embodiment corresponds to the “first reinforcing fiber layer” in [Means for Solving the Problems]. The strand 501s included in the reinforcing fiber layer 501 corresponds to the “first strand”. The reinforcing fiber layer 502 corresponds to a “second reinforcing fiber layer”. The strands 502 s included in the reinforcing fiber layer 502 correspond to “second strands”. The reinforcing fiber layer 503 corresponds to the “third reinforcing fiber layer”. The strand 503s included in the reinforcing fiber layer 503 corresponds to the “third strand”.

A5. Joining of reinforcing fiber layers:
In the reinforcing fiber sheet of the present disclosure, a resin binder is preferably present on at least one side of the reinforcing fiber layer or the strand. The resin binder can be fixed to the reinforcing fiber layer or the surface layer of the strand, and can obtain an action of fixing and joining the outermost layers of the reinforcing fiber sheet. Examples of the resin binder include a thermoplastic resin and a thermosetting resin.

  Examples of the thermoplastic resin include resins such as polyamide, polysulfone, polyetherimide, polyphenylene ether, polyimide, and polyamideimide. Examples of the thermosetting resin include an epoxy resin, a vinyl ester resin, an unsaturated polyester resin, and a phenol resin.

  The amount of the resin binder present in the interlayer and the surface layer of the reinforcing fiber sheet is preferably in the range of 0.1 to 20 parts by mass with respect to 100 parts by mass of the reinforcing fiber sheet. When the application amount of the resin binder as the fixing material is smaller than 0.1 parts by mass, it is difficult to maintain the shape as the reinforcing fiber sheet even if the reinforcing fiber layers and / or the strands are bonded with the resin binder. Become. On the other hand, when the application amount of the resin binder as the adhering material is larger than 20 parts by mass, the resin binder is strongly restrained in the entire reinforcing fiber sheet, which may hinder shape followability to the mold. In particular, when the amount of the resin binder is 2 to 10 parts by mass with respect to 100 parts by mass of the reinforcing fiber sheet, the shape following property to the mold is relatively good while maintaining the shape of the sheet, which is more preferable. It is an aspect.

  The form of the resin binder may be, for example, a powder form or a linear form. Moreover, a resin binder can also be distribute | arranged between layers as a nonwoven fabric form.

  The attachment method when attaching the resin binder to the reinforcing fiber may be performed by, for example, spreading the resin binder on the strand as a pretreatment, and after aligning the strand by the fiber placement method, It is also possible to apply a resin binder to the strands by spraying a resin binder.

  Examples of the method of fixing the interlayer of the reinforcing fiber sheet with the resin binder include a method of heating and melting the resin binder using an infrared heater in a state where the resin binder exists between the layers of the reinforcing fiber sheet, or a heated metal flat plate And a method of heating and pressurizing the entire surface of the reinforcing fiber sheet.

  In the case of producing a fiber reinforced resin molded body using the reinforced fiber sheet and the matrix resin, examples of the matrix resin to be used include thermosetting resins such as epoxy resins, vinyl ester resins, unsaturated polyester resins, and phenol resins. Not limited to these, thermoplastic resins such as acrylic resins, polyamide resins, and polyolefin resins can also be used.

  The reinforcing fiber sheet of the present disclosure is used when a fiber reinforced resin molded body is produced by an RTM molding method, and uses of the fiber reinforced resin molded body include, for example, automobile hoods, roofs, doors, fenders, trunk lids, Side panels, rear end panels, upper back panels, front bodies, under bodies, various pillars, various members, various frames, various beams, various supports, various rails, various hinges, etc. Used for materials.

B. Example:
Next, the reinforcing fiber sheet of the present disclosure will be described based on examples.

Example 1
<Reinforcing fiber>
As the reinforcing fiber, carbon fiber “Torayca” (registered trademark) T800SC manufactured by Toray Industries, Inc., which had been previously sized, was used. In the examples, a strand having a strand width of 6.5 mm and a single strand having 24,000 single fibers was used.

<Applying resin binder>
Using a spraying device, epoxy resin particles (LT3366 manufactured by Huntsman, particle size: 100 μm, melting point: 80 ° C.) are sprayed on the strand, and using an infrared heater, the surface reinforcing fiber layer is in a state of a temperature of 130 ° C. Heated for 30 seconds to deposit the epoxy resin particles on the strand.

<Reinforcing fiber layer>
Using a fiber placement head, a strand was arranged on one frame along one direction, and a reinforcing fiber layer was produced so as to have a rectangular shape of 200 mm × 300 mm. At that time, the strands were arranged so that the gap between adjacent strands in one layer was 6.5 mm. Three such reinforcing fiber layers were laminated.

<Lamination and adhesion>
A second reinforcing fiber layer was formed on the lowermost reinforcing fiber layer so that the direction of the fiber bundle was 90 degrees with respect to the direction of the first fiber bundle. A third reinforcing fiber layer was formed on the second reinforcing fiber layer so that the direction of the fiber bundle coincided with the first layer. In the gap between the second-layer reinforcing fibers, the first-layer and third-layer layers were fixed at random positions to produce a reinforcing fiber sheet.

<Shaping>
A reinforcing fiber sheet prepared on a mold having a concave portion with a curved shape (width: 100 mm, height: 70 mm, length: 1000 mm, curvature: 3000 mm) was placed, and the mold temperature was confirmed to be 20 ° C. Later, press shaping was performed. Thereafter, the mold was heated to 110 ° C., pressurized at 50 kPa, and held for 30 seconds to prepare a preform. The mold was cooled to 30 ° C., and the preform was taken out. It was confirmed that the reinforcing fiber sheet could conform to the mold shape without losing the alignment of the fiber bundle due to shear deformation, and had good shaping performance.

<Molding>
The preform was placed on the lower mold of an RTM molding double-sided mold maintained at a temperature of 110 ° C., the upper mold was closed, and the air in the mold was discharged by a vacuum pump. Next, a two-component epoxy resin (main component: manufactured by Momentive, curing agent: manufactured by Toray Industries, Inc., acid anhydride curing agent) is injected into the mold at an injection pressure of 0.5 MPa, impregnated into the preform, and 10 Left for a minute. In this way, a fiber reinforced resin molded product was obtained.

  The obtained fiber reinforced resin molded product had a smooth surface with no significant disturbance in the strands visible on the surface and no wrinkles, and was particularly excellent as a fiber reinforced resin molded product.

C. Composite reinforcing fiber sheet:
Below, the composite reinforcement fiber sheet comprised using a some reinforcement fiber sheet is demonstrated.

  FIG. 8 is a cross-sectional view schematically showing a reinforcing fiber sheet 100A according to an embodiment of the present disclosure. The reinforcing fiber sheet 100A includes two reinforcing fiber layers 103Aa and 103Ab between the outermost reinforcing fiber layers 101A and 102A. Further, the reinforcing fiber sheet 100A is different from the reinforcing fiber sheet 100 (see FIGS. 1 and 2) in the relationship between the strand width and the pitch of each reinforcing fiber layer. The other points of the reinforcing fiber sheet 100A are the same as those of the reinforcing fiber sheet 100. In the reinforcing fiber sheet 100 </ b> A shown in FIGS. 8 and 9, the configuration corresponding to the configuration of the reinforcing fiber sheet 100 is denoted by the reference symbol A indicating the configuration of the reinforcing fiber sheet 100.

  FIG. 9 is a plan view schematically showing a reinforcing fiber sheet 100A according to an embodiment of the present disclosure. In the reinforcing fiber sheet 100A, the width W1A of the strand 101As of the outermost reinforcing fiber layer 101A and the width W2A of the strand 102As of the outermost reinforcing fiber layer 102A are substantially the same. The plurality of strands 101As are arranged in parallel to each other with substantially the same interval as the width of the strands 101As. The strand 102As is arranged in parallel to the strand 101As so as to face the strand 101As. A pair of strands 101As and 102As facing each other is referred to as a strand pair 107As. The strand pairs 107As are arranged in parallel at a pitch twice as large as the width W1A (equal to W2A) of the strand pairs 107As (strands 101As, 102As).

  In the reinforcing fiber sheet 100A, the widths W3Aa and W3Ab of the strands 103Aas and 103Abs of the inner reinforcing fiber layers 103Aa and 103Ab are substantially the same as the width W1A of the strand 101As. The plurality of strands 103Aas are arranged in parallel to each other. The strand 103Abs is arranged in parallel to the strand 103Aas so as to face the strand 103Aas. A pair of strands 103Aas and 103Abs facing each other is referred to as a strand pair 108As. The strand pair 108As is arranged in parallel at the same pitch as the strand pair 107As (a pitch twice the width W1A of the strand pair 107As).

  The strands 101As and 102As constituting the strand pair 107As are joined to each other at a plurality of portions 105A between the plurality of strand pairs 108As arranged in parallel. The outermost strands 101As and 102As are not joined to the inner strands 103Aas and 103Abs.

  FIG. 10 is a cross-sectional view schematically showing a reinforcing fiber sheet 100B according to an embodiment of the present disclosure. FIG. 11 is a plan view schematically showing a reinforcing fiber sheet 100B according to an embodiment of the present disclosure. The reinforcing fiber sheet 100B has the same configuration as the reinforcing fiber sheet 100A. In the reinforcing fiber sheet 100B shown in FIG. 10 and FIG. 11, the configuration corresponding to the configuration of the reinforcing fiber sheet 100A is indicated by adding a symbol B in place of the symbol A in the symbol representing the configuration of the reinforcing fiber sheet 100A. FIG. 10 corresponds to a view obtained by rotating FIG. 8 showing the cross section of the reinforcing fiber sheet 100A by 90 degrees. FIG. 11 corresponds to a view obtained by rotating FIG. 9 showing the reinforcing fiber sheet 100A by 90 degrees.

  FIG. 12 is an explanatory view showing the configuration of the composite reinforcing fiber sheet 200 as viewed from the lamination direction of the reinforcing fiber sheets. The composite reinforcing fiber sheet 200 is formed by laminating the reinforcing fiber sheet 100A (see FIGS. 8 and 9) and the reinforcing fiber sheet 100B (see FIGS. 10 and 11) with the strand direction of the outermost layer shifted by 90 degrees. It is comprised by.

  Here, in order to facilitate understanding of the technology, a pair of reinforcing fiber sheets 100A and 100B that are adjacent to each other will be described as an example. However, the composite reinforcing fiber sheet 200 can also be configured by laminating a plurality of adjacent reinforcing fiber sheets 100A and reinforcing fiber sheets 100B.

  In the composite reinforcing fiber sheet 200, the direction of the outermost strand pair 107Bs (strands 101Bs and 101Bs) of the reinforcing fiber sheet 100B is the direction of the inner strand pair 108As (strands 103Aas and 103Abs) of the reinforcing fiber sheet 100A (in FIG. 12). (Vertical direction) and parallel. When the composite reinforcing fiber sheet 200 is viewed from the stacking direction (see FIG. 12), the reinforcing fiber sheet is positioned at the center between the adjacent strand pairs 107Bs (strands 101Bs and 101Bs) in the outermost layer of the reinforcing fiber sheet 100B. A pair of strands 108As (strands 103Aas, 103Abs) of the inner layer of 100A is arranged.

  In addition, in this specification, "the strand A is located between the strand B and the strand C" means that the center line along the longitudinal direction of the strand A is a center line along the longitudinal direction of the strand B; It means that it is located between the center line along the longitudinal direction of the strand C. That is, a mode in which a part of the strand A overlaps with the strand B and / or the strand C is included. The same applies to the case where “strand pair A is located between strand pair B and strand pair C”.

  In the composite reinforcing fiber sheet 200, the strand pairs 108As of the inner layer of the reinforcing fiber sheet 100A are arranged in parallel. The pitch WP3A of the strand pair 108As is the same as the pitch WP1B of the strand pair 107Bs of the outermost layer of the reinforcing fiber sheet 100B. The width W3Aa (= W3Ab) of the strands 103Aas and 103Abs constituting the strand pair 108As is equal to the width W2B (= W1B) of the strands 101Bs and 102Bs constituting the strand pair 107Bs.

  For this reason, the total value (W3Aa + W2B) of the width of the strand pair 108As and the width of the strand pair 107Bs is equal to the pitch WP1B of the strand pair 107Bs. The total value (W3Aa + W2B) of the width of the strand pair 108As and the width of the strand pair 107As is equal to the pitch WP3A of the strand pair 108As.

  Thus, the following effects are acquired when the width | variety of each strand is substantially the same. That is, in the reinforcing fiber sheet 100A and the reinforcing fiber sheet 100B adjacent to each other, a plurality of strand pairs 107Bs (strands 101Bs and 102Bs) of the reinforcing fiber sheet 100B having substantially the same width as each other and a plurality of strand pairs 108As of the reinforcing fiber sheet 100A (Strands 103Aas, 103Abs) are alternately arranged. A plurality of strand pairs 108Bs (strands 103Bas and 103Bbs) of the reinforcing fiber sheet 100B having substantially the same width and a plurality of strand pairs 107As (strands 101As and 102As) of the reinforcing fiber sheet 100A are alternately arranged. Will be. As a result, the composite reinforcing fiber sheet 200 having a beautiful appearance and / or surface property can be configured.

  Further, the strand pair 107Bs (strands 101Bs and 101Bs) of the reinforcing fiber sheet 100B and the strand pair 108As (strands 103Aas and 103Abs) of the reinforcing fiber sheet 100A, which are arranged in parallel, are respectively strands so as to complement each other's gap. Arranged at a pitch twice the width of the pair. As a result, the region in the composite reinforcing fiber sheet 200 can be covered with the strand pair 107Bs and the strand pair 108As of the reinforcing fiber sheet 100A. The same applies to the plurality of strand pairs 108Bs of the reinforcing fiber sheet 100B and the plurality of strand pairs 107As of the reinforcing fiber sheet 100A. As a result, the composite reinforcing fiber sheet 200 having a beautiful appearance and / or surface property can be configured. And the quantity of the matrix resin in the case of RTM shaping | molding can be reduced compared with the aspect in which each strand is arranged with a clearance gap. As a result, the weight of the molded product can be reduced.

  In the composite reinforcing fiber sheet 200, the plurality of strands 101Bs of the reinforcing fiber sheet 100B and the plurality of strands 102As of the reinforcing fiber sheet 100A facing each other are joined to each other at a plurality of portions 109. The joining portion 109 is a portion between the plurality of strand pairs 108Bs in the inner layer of the reinforcing fiber sheet 100B and between the plurality of strand pairs 108As in the inner layer of the reinforcing fiber sheet 100A. The part 109 to be joined is circular. The inner layer strand pair 108As of the reinforcing fiber sheet 100A and the inner layer strand pair 108Bs of the reinforcing fiber sheet 100B are not joined to the outer layer strand.

  In such a configuration, when receiving an external force that is a shearing force along the direction of the surfaces of the reinforcing fiber sheets 100A and 100B (see FIG. 3), the plurality of pairs of strands 108As and 108Bs in the inner layer of each reinforcing fiber sheet are , Each may be displaced relatively. The plurality of strand pairs 107As and 107Bs in the outermost layer of each reinforcing fiber sheet can also be relatively displaced by shear deformation in the vicinity of the joining portion 109. The plurality of strand pairs 108As and 108Bs and the plurality of strand pairs 107As and 107Bs propagate external force due to friction at the contact portions. For this reason, the composite reinforcing fiber sheet 200 can be subjected to shear deformation throughout the fabric.

  Further, in the composite reinforcing fiber sheet 200 of the present embodiment, the joining portion 109 is circular. For this reason, the strand pair 107As and the strand pair 107Bs (the strand 102As and the strand 101Bs) joined at the joining portion 109 are easily shear-deformed around the joining portion 109. For this reason, the strand pair 107As and the strand pair 107Bs that define the lattice structure, which is the basic structure of the composite reinforcing fiber sheet 200, are also susceptible to shear deformation.

  The reinforcing fiber sheet 100A (see FIG. 9) has different deformation characteristics in the longitudinal direction of the outermost strand pair 107As and the longitudinal direction of the inner strand pair 108As. The reinforcing fiber sheet 100B (see FIG. 11) also has different deformation characteristics in the longitudinal direction of the outermost strand pair 107Bs and the longitudinal direction of the inner strand pair 108Bs. In the composite reinforcing fiber sheet 200, the reinforcing fiber sheets 100A and 100B are arranged so that the outermost strand pairs 107As and 107Bs intersect at an angle of 90 degrees. As a result, in the composite reinforcing fiber sheet 200, the anisotropy regarding the physical properties of the respective reinforcing fiber sheets 100A and 100B is offset and reduced.

D. Other embodiments:
(1) Other embodiments of composite reinforcing fiber sheet:
(1-1) In the composite reinforcing fiber sheet 200 of the above embodiment, the widths of the strands 101As, 102As, 103Aas, 103Abs, 101Bs, 102BAs, 103Bas, 103Bbs of each layer are substantially the same. However, the widths of the outermost strand and the inner strand of the reinforcing fiber sheet may be different. Further, in different reinforcing fiber sheets, the width of the outermost strand may be different. In different reinforcing fiber sheets, the widths of the strands of the inner layer may be different.

  However, in one reinforcing fiber sheet, the width of one outermost strand is preferably 0.8 to 1.2 times the width of the other outermost strand. And in one reinforcing fiber sheet, it is preferable that the width | variety of the strand of an inner layer is 0.8 to 1.2 times the width | variety of said other strand.

  If it is set as such an aspect, the width | variety of the strand extended in a different direction will become substantially equal in one reinforcing fiber sheet, and the composite reinforcing fiber sheet with a beautiful external appearance and / or surface property can be comprised. Further, in the composite reinforcing fiber sheet, the plurality of first strands of the second reinforcing fiber sheet having substantially the same width as each other and the plurality of third strands of the first reinforcing fiber sheet complement each other's gap. To be arranged. As a result, a composite reinforcing fiber sheet having a beautiful appearance and / or surface property can be formed.

(1-2) In the above embodiment, the strands in the same layer are arranged at a pitch twice the width of the strands. However, each strand in the same layer can be arranged at other pitches such as 1.6 times or 2.4 times the width of the strand. However, the pitch of the strands in one layer is preferably a constant value 1.8 to 2.2 times the width of the strands in the layer. If it is set as such an aspect, all the area | regions can be substantially covered with the strand arrange | positioned alternately by piling up two reinforcing fiber sheets in a 90 degree different direction. For this reason, a composite reinforcing fiber sheet having a beautiful appearance and / or surface property can be formed.

(1-3) In the composite reinforcing fiber sheet 200 of the above embodiment, the pair of strands 107As (strands 101As and 102As) are arranged in parallel at a pitch WP1A that is twice the widths W1A and W2A of the strands 101As and 102As. Yes. The strand pairs 108As (strands 103Aas, 103Abs) are arranged in parallel at the same pitch (WP3A = WP1A) as the strand pairs 107As. However, the pitch of the strands in the layer may be different from the pitch of the strands in the outermost layer.

  However, in the two reinforcing fiber sheets adjacent in the composite reinforcing fiber sheet, the plurality of first strands of the second reinforcing fiber sheet and the plurality of third strands of the first reinforcing fiber sheet are equal. It is preferable that they are arranged at a pitch. In such an aspect, in two adjacent reinforcing fiber sheets, the first strand of the second reinforcing fiber sheet and the third strand of the first reinforcing fiber sheet, which are alternately arranged in parallel, They can be arranged at the same pitch. Therefore, a composite reinforcing fiber sheet having a beautiful appearance and / or surface property can be formed.

  Moreover, in two adjacent reinforcing fiber sheets, the plurality of first strands of the second reinforcing fiber sheet and the plurality of third strands of the first reinforcing fiber sheet are arranged at different pitches. The following problems arise. That is, when the reinforcing fiber sheets to be laminated are larger than a certain extent, the plurality of third strands of the first reinforcing fiber sheet are positioned between the plurality of first strands of the second reinforcing fiber sheet. The first reinforcing fiber sheet and the second reinforcing fiber sheet cannot be laminated. However, in the aspect in which the plurality of first strands of the second reinforcing fiber sheet and the plurality of third strands of the first reinforcing fiber sheet are arranged at an equal pitch, the second reinforcing fiber sheet When the first reinforcing fiber sheet and the second reinforcing fiber sheet are laminated such that the plurality of third strands of the first reinforcing fiber sheet are located between the plurality of first strands of There is no restriction on the fiber sheet size.

(1-4) In the above embodiment, the strands in the same layer are arranged at a pitch twice the width of the strands. For this reason, in the reinforcing fiber sheet 100A and the reinforcing fiber sheet 100B adjacent to each other, the total value of the width W1B of the outermost strand 101Bs of the reinforcing fiber sheet 100B and the W3Aa width of the inner strand 103Aas of the reinforcing fiber sheet 100A is 100% of their pitch. However, the relationship between the sum of the widths of the strands of the outermost layer and the inner layer of the reinforcing fiber sheets adjacent to each other and the pitch may be another relationship.

  However, in the adjacent reinforcing fiber sheets in the composite reinforcing fiber sheet, the total dimension of the width of the outermost strand of the first reinforcing fiber sheet and the width of the inner strand of the second reinforcing fiber sheet is: It is preferably 95% or more of those pitches, and more preferably 97% or more. By setting it as such an aspect, the area | region in a composite reinforcement fiber sheet is substantially covered with the strand of the outermost layer of the 1st reinforcement fiber sheet and the strand of the inner layer of a 2nd reinforcement fiber sheet which are located in a line in parallel. The composite reinforcing fiber sheet having a beautiful appearance and / or surface texture can be formed.

  Further, in the adjacent reinforcing fiber sheets in the composite reinforcing fiber sheet, the total dimension of the width of the outermost strand of the first reinforcing fiber sheet and the width of the inner strand of the second reinforcing fiber sheet is: The pitch is preferably 100% or less of the pitch, and more preferably 99% or less.

  In such an embodiment, by appropriately arranging two adjacent reinforcing fiber sheets, an overlapping portion between the outermost strand of the first reinforcing fiber sheet and the inner strand of the second reinforcing fiber sheet is eliminated. be able to. For this reason, variation in the thickness of the composite reinforcing fiber sheet can be reduced.

  In addition, the relationship between the width and pitch of the strands described above is that the first strand of the second reinforcing fiber sheet and the first reinforcing fiber sheet in the adjacent first reinforcing fiber sheet and second reinforcing fiber sheet. It is established between the third strands (see 107Bs and 108As in FIG. 12), and between the third strands of the second reinforcing fiber sheet and the first strands of the first reinforcing fiber sheet (same, 107 As and 108 Bs), it may not be established. Further, in the adjacent first reinforcing fiber sheet and the second reinforcing fiber sheet, between the third strand of the second reinforcing fiber sheet and the first strand of the first reinforcing fiber sheet (107 As , 108Bs), and not established between the first strand of the second reinforcing fiber sheet and the third strand of the first reinforcing fiber sheet (see 107Bs, 108As). Also good.

  However, like the composite reinforcing fiber sheet 200 of the above-described embodiment, the first strands of the second reinforcing fiber sheet and the first reinforcing fibers in the adjacent first reinforcing fiber sheet and second reinforcing fiber sheet. Between the third strand of the sheet (see 107Bs and 108As in FIG. 12) and between the first strand of the second reinforcing fiber sheet and the third strand of the first reinforcing fiber sheet (same as above). , 107As, 108Bs).

(1-5) In the above embodiment, the strand pair 108As of the inner layer of the reinforcing fiber sheet 100A is arranged so as to be positioned at the center between the adjacent strand pair 107Bs in the outermost layer of the reinforcing fiber sheet 100B. . However, in the adjacent first reinforcing fiber sheet and second reinforcing fiber sheet, the plurality of third strands of the first reinforcing fiber sheet is between the plurality of first strands of the second reinforcing fiber sheet. As long as it is arranged so as to be located, it may be arranged at a position other than the center.

  However, the plurality of third strands of the first reinforcing fiber sheet are arranged in the center between the plurality of first strands of the second reinforcing fiber sheet, so that the first reinforcing fibers lined up in the same direction. The pitch between the third strand of the sheet and the first strand of the second reinforcing fiber sheet is constant. As a result, the composite reinforcing fiber sheet 200 having a beautiful appearance and / or surface property can be configured.

(1-6) In the above-described composite reinforcing fiber sheet 200, reinforcing fiber sheets 100A and 100B (see FIGS. 9 and 11) in which the inner strand and the outermost strand intersect at an angle of 90 degrees are used. . However, the pair of adjacent reinforcing fiber sheets constituting the composite reinforcing fiber sheet is a reinforcing fiber in which the inner layer strand and the outermost layer strand intersect at an angle other than 90 degrees (for example, 80 degrees, 60 degrees, 45 degrees, etc.). It may be a sheet.

  However, in the adjacent first reinforcing fiber sheet and second reinforcing fiber sheet, the orientation of the plurality of first strands of the second reinforcing fiber sheet is the same as that of the plurality of third strands of the first reinforcing fiber sheet. The direction is preferably substantially parallel to the direction. In such an aspect, the first reinforcing fiber sheet and the first reinforcing fiber sheet so that the plurality of third strands of the first reinforcing fiber sheet are located between the plurality of first strands of the second reinforcing fiber sheet. When laminating the second reinforcing fiber sheet, there is no restriction on the size of the reinforcing fiber sheet.

  Then, in the adjacent first reinforcing fiber sheet and second reinforcing fiber sheet, the directions of the plurality of third strands of the second reinforcing fiber sheet are such that the directions of the plurality of first strands of the first reinforcing fiber sheet are the same. The direction is preferably substantially parallel to the direction. In such an aspect, the first reinforcing fiber sheet and the first reinforcing fiber sheet so that the plurality of first strands of the first reinforcing fiber sheet are located between the plurality of third strands of the second reinforcing fiber sheet. When laminating the second reinforcing fiber sheet, there is no restriction on the size of the reinforcing fiber sheet.

(1-7) In the above-described composite reinforcing fiber sheet 200, the portions 109 where the plurality of strands 101Bs of the reinforcing fiber sheet 100B and the plurality of strands 102As of the reinforcing fiber sheet 100A are joined to each other are circular. Yes (see FIG. 12). However, the joining portion may have other shapes such as a triangle and a quadrangle. In addition, the joining portion may have a smaller area such as an annular shape or a cross shape.

  In the above-mentioned composite reinforcing fiber sheet 200, a plurality of strands 101Bs of the reinforcing fiber sheet 100B and a plurality of strands 102As of the reinforcing fiber sheet 100A facing each other are joined. In such a mode of joining, for example, an adhesive is disposed between the plurality of strands 101Bs of the reinforcing fiber sheet 100B and the plurality of strands 102As of the reinforcing fiber sheet 100A, and between the other layers of the part. This can be realized by not providing an adhesive.

  However, an adhesive may be provided between all the layers to join the portions. That is, the layers other than the plurality of first strands of the second reinforcing fiber sheet and the plurality of second strands of the first reinforcing fiber sheet facing each other are bonded at the bonding site. Or it may not be joined.

(2) Other embodiments of the reinforcing fiber sheet:
(2-1) In the reinforcing fiber sheet 100 (see FIG. 2), the angle formed by the strand 103s of the reinforcing fiber layer 103 and the strand 101s of the reinforcing fiber layer 101 is 90 degrees. On the other hand, the angle formed by the strand 102s of the reinforcing fiber layer 102 and the strand 101s of the reinforcing fiber layer 101 is zero. The same applies to the reinforcing fiber sheet 500.

  In contrast, in the reinforcing fiber sheet 300 (see FIG. 4), the angle formed by the strands 303as and 303bs of the reinforcing fiber layer 303 and the strand 301s of the reinforcing fiber layer 301 is 90 degrees. The angle formed by the strands 303as and 303bs of the reinforcing fiber layer 303 and the strand 302s of the reinforcing fiber layer 302 is about 85 degrees. On the other hand, the angle formed by the strand 302s of the reinforcing fiber layer 302 and the strand 301s of the reinforcing fiber layer 301 is about 5 degrees.

  In the reinforcing fiber sheet 400 (see FIG. 5), the angle formed by the strands 403bs of the reinforcing fiber layer 403b and the strands 401s and 402s of the reinforcing fiber layers 401 and 402 is 90 degrees. The angle formed by the strand 403as of the reinforcing fiber layer 403a and the strands 401s and 402s of the reinforcing fiber layers 401 and 402 is about 87 degrees. On the other hand, the angle formed by the strand 402s of the reinforcing fiber layer 402 and the strand 401s of the reinforcing fiber layer 401 is zero.

  However, the angle formed by the strands of each layer is not limited to the above-described aspect. That is, in the present disclosure, the size of the angle formed by the third strand of the inner layer and the first strand of one outermost layer is the angle formed by the second strand of the other outermost layer and the first strand. (For example, 0 in the reinforcing fiber sheets 100, 400, and 500; approximately 5 degrees in the reinforcing fiber sheet 300) may be closer to 90 degrees.

(2-2) In the embodiment described above, the strands 101s, 301s, 401s, and 501s of the reinforcing fiber layers 101, 301, 401, and 501 that are the outermost layers are separated from each other. However, the plurality of first strands of the outermost layer may overlap each other.

  In the embodiment described above, the strands 102s, 302s, 402s, and 502s of the reinforcing fiber layers 102, 302, 402, and 502 that are the outermost layers are separated from each other. However, the plurality of second strands in the outermost layer may overlap each other.

(2-3) In the reinforcing fiber sheet 300, one strand 302s is joined to two or more strands 301s. One strand 301s is joined to two or more strands 302s. As a result, three or more strands 301s and 302s can be fixed to each other. However, it is preferable that the strand pairs 107s, 407s, and 507s that are fixed to face each other like the reinforcing fiber sheets 100, 400, and 500 are not fixed to the other strand pairs.

(2-4) In the above embodiment, the outermost reinforcing fiber layer is bonded with a resin binder. However, the outermost reinforcing fiber layers may be stitched together and joined together by a member such as a stapler.

(2-5) In the reinforcing fiber sheets 100, 300, and 500 of the above embodiment, the strands included in the surface layers on both sides and the inner layer therebetween are parallel to each other (FIGS. 1 to 4 and FIG. 6). FIG. 7). However, like the reinforcing fiber sheet 400 shown in FIG. 5, the strands included in each layer may not be parallel to each other. However, it is preferable that the strands contained in the surface layers on both sides and the inner layer therebetween are substantially parallel to each other. In the present specification, the phrase that the strands are “substantially parallel” means that the angle between the strands is 5 degrees or less.

(2-6) In the reinforcing fiber sheets 100 and 500 of the above embodiment, the inner layer located between the surface layers on both sides is one layer, and the strands included in the inner layer are parallel to each other (FIGS. 1 to 3). FIG. 6 and FIG. 7). As a result, the strands contained in the inner layer do not overlap each other. However, when the reinforcing fiber sheet includes a plurality of inner layers, such as the reinforcing fiber sheet 300 shown in FIG. 4 and the reinforcing fiber sheet 400 shown in FIG. 5, the strands included in different inner layers (for example, the strand 303as and the strand 303bs) may overlap. However, also in such an aspect, it is preferable that the inner layers in the same layer do not overlap each other.

  The inner layer positioned between the surface layers on both sides may be three or more layers. The plurality of strands included in the plurality of inner layers are preferably substantially parallel to each other.

  This indication is not restricted to the above-mentioned embodiment, an example, and a modification, and can be realized with various composition in the range which does not deviate from the meaning. For example, the technical features in the embodiments, examples, and modifications corresponding to the technical features in each embodiment described in the summary section of the invention are to solve some or all of the above-described problems, or In order to achieve part or all of the above effects, replacement or combination can be performed as appropriate. Further, if the technical feature is not described as essential in the present specification, it can be deleted as appropriate.

DESCRIPTION OF SYMBOLS 100,100A, 100B ... Reinforcement fiber sheet 101, 101A, 101B ... Reinforcement fiber layer 101s, 101As, 101Bs ... Strand 102, 102A, 102B ... Reinforcement fiber layer 102s, 102As, 102Bs ... Strand 103, 103Aa, 103Ab, 103Ba, 103Bb ... Reinforcing fiber layer 103s, 103Aas, 103Abs, 103Bas, 103Bbs ... Strands 104, 104A, 104B ... Gap 105, 105A, 105B, 109 ... Joining part 106 ... External force 107s, 107As, 107Bs ... Strand pair 108As, 108Bs ... Strand pair 200 ... composite reinforcing fiber sheet 300 ... reinforcing fiber sheet 301 ... reinforcing fiber layer 301 s ... strand 302 ... reinforcing fiber layer 302 s ... strand 303a ... strong Fiber layer 303as ... Strand 303b ... Reinforced fiber layer 303bs ... Strand 304 ... Gap 305 ... Joined part 400 ... Reinforced fiber sheet 401 ... Reinforced fiber layer 401s ... Strand 402 ... Reinforced fiber layer 402s ... Strand 403a ... Reinforced fiber layer 403as ... Strand 403b ... Reinforcing fiber layer 403bs ... Strand 404 ... Gap 405 ... Joining part 407s ... Strand pair 500 ... Reinforcing fiber sheet 501 ... Reinforcing fiber layer 501s ... Strand 502 ... Reinforcing fiber layer 502s ... Strand 503 ... Reinforcing fiber layer 503s ... Strand 504 ... Gap 505 ... Joint site 506 ... Area 507s ... Strand pair W1A ... Width of strand 101As W2A ... Width of strand 102As W1B ... Width of strand 101Bs W2B ... Strand Width of 102Bs W3Aa ... Width of strand 103Aas W3Ab ... Width of strand 103Abs W3Ba ... Width of strand 103Bas W3Bb ... Width of strand 103Bbs WP1A ... Strand pair 107As (Strand 101As, 102As) Pitch WP1B ... Strand pair 107Bs (Strand 101Bs) Pitch WP3A ... Strand pair 108As (Strand 103Aas, 103Abs) Pitch WP3B ... Strand pair 108Bs (Strand 103Bas, 103Bbs) Pitch

Claims (7)

A composite reinforcing fiber sheet including a plurality of reinforcing fiber sheets,
Each of the plurality of reinforcing fiber sheets is
A plurality of first strands arranged substantially parallel to each other, a first reinforcing fiber layer located on one surface of the reinforcing fiber sheet;
A plurality of second strands arranged substantially parallel to each of the first strands so as to face the first strands, a second reinforcing fiber layer located on the other surface of the reinforcing fiber sheet;
A plurality of third strands arranged substantially parallel to each other so as not to overlap each other in a direction intersecting with the plurality of first strands, the first reinforcing fiber layer and the second reinforcing fiber layer; And one or more third reinforcing fiber layers positioned between,
The plurality of first strands and the plurality of second strands are not joined to the plurality of third strands, but are joined to each other at a plurality of portions between the plurality of third strands. ,
Among the plurality of reinforcing fiber sheets, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other,
The direction of the plurality of first strands of the second reinforcing fiber sheet is substantially parallel to the direction of the plurality of third strands of the first reinforcing fiber sheet,
When viewed from the lamination direction, the plurality of third strands of the first reinforcing fiber sheet are arranged so as to be positioned between the plurality of first strands of the second reinforcing fiber sheet. ,
The plurality of first strands of the second reinforcing fiber sheet and the plurality of second strands of the first reinforcing fiber sheet facing each other are the plurality of second strands of the second reinforcing fiber sheet. A composite reinforcing fiber sheet that is bonded to each other at a plurality of sites between the three strands and between the plurality of third strands of the first reinforcing fiber sheet. The composite reinforcing fiber sheet according to claim 1,
The width of the second strand is 0.8 to 1.2 times the width of the first strand,
The composite reinforcing fiber sheet, wherein the width of the third strand is 0.8 to 1.2 times the width of the first strand. The composite reinforcing fiber sheet according to claim 2,
In one of the reinforcing fiber sheets,
The plurality of first strands and the plurality of second strands are arranged at a pitch of 1.8 to 2.2 times the width of the first strand,
The composite reinforcing fiber sheet, wherein the plurality of third strands are arranged at a pitch of 1.8 to 2.2 times the width of the third strand. The composite reinforcing fiber sheet according to any one of claims 1 to 3,
Among the plurality of reinforcing fiber sheets, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other,
The composite reinforcing fiber sheet, wherein the plurality of first strands of the second reinforcing fiber sheet and the plurality of third strands of the first reinforcing fiber sheet are arranged at an equal pitch. The composite reinforcing fiber sheet according to claim 4,
Among the plurality of reinforcing fiber sheets, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other,
The total value of the width of the first strand of the second reinforcing fiber sheet and the width of the third strand of the first reinforcing fiber sheet is 95 to 100% of the equal pitch. Reinforced fiber sheet. The composite reinforcing fiber sheet according to any one of claims 1 to 5,
Among the plurality of reinforcing fiber sheets, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other,
The composite reinforcing fiber sheet, wherein the plurality of third strands of the second reinforcing fiber sheet and the plurality of first strands of the first reinforcing fiber sheet are arranged at an equal pitch. The composite reinforcing fiber sheet according to claim 6,
Among the plurality of reinforcing fiber sheets, in the first reinforcing fiber sheet and the second reinforcing fiber sheet adjacent to each other,
The total value of the width of the third strand of the second reinforcing fiber sheet and the width of the first strand of the first reinforcing fiber sheet is 95 to 100% of the equal pitch. Reinforced fiber sheet.

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