JP2016121424A - Reinforced fiber backing material, fiber reinforced resin moulding therewith and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give superior formativeness to a reinforced fiber backing material while keeping strength and modulus of elasticity.SOLUTION: A reinforced fiber backing material 10 has a sheet body 16 in which a plurality of first continuous fibers (e.g., carbon fibers 12) is sewed up with stitch thread 14 to be unified. A plurality of second continuous fibers (e.g., glass fibers 22) is placed with the stitch thread 14 on the surface 16a and rear surface 16b of the sheet body 16, and forms a face fiber bed 18 and rear face fiber bed 20. Because adjacent glass fibers 22 are estranged in the face fiber bed 18 and the rear face fiber bed 20, a contact area of the carbon fiber 12 with the face fiber bed 18 and the rear face fiber bed 20 is small. Therefore, friction drag therebetween becomes less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reinforced fiber base material having a sheet body integrated by stitching a plurality of continuous fibers with stitch yarns, a fiber reinforced resin molded product having the same, and a method for producing the same.

  A fiber reinforced resin (FRP) obtained by impregnating a matrix resin into a reinforced fiber base material is excellent in strength and elastic modulus, and is lightweight. For example, as a structural member of an aircraft or automobile body, Widely used. Of course, the FRP is formed into a predetermined shape suitable for the application.

  An FRP molded product is obtained by heating a reinforcing fiber base material and preforming it, and storing the preformed product thus obtained in a molding die and then injecting a molten resin into the molding die. In the mold, the molten resin flows along the cavity and penetrates into the gap between the reinforcing fibers constituting the reinforcing fiber base. Thereafter, the matrix resin impregnated in the reinforcing fiber base is cured to obtain an FRP molded product.

  Here, the reinforcing fiber base is composed of a sheet body obtained by stitching a plurality of reinforcing fibers (generally, carbon fibers) with stitch yarns. The reinforcing fibers are aligned in the longitudinal direction. In other words, each reinforcing fiber extends in the same direction. In this case, a difference occurs between the strength and elastic modulus along the longitudinal direction of the reinforcing fiber and the strength and elastic modulus along the direction orthogonal to the longitudinal direction. That is, anisotropy appears. For this reason, while laminating a plurality of reinforcing fiber layers, the sheet body may be configured such that the longitudinal directions of the reinforcing fibers in each reinforcing fiber layer intersect at a predetermined angle.

  However, with such a sheet body, it is difficult to perform shaping at the time of preforming. Therefore, in Patent Document 1, it is proposed to form a cut end in a direction in which the reinforcing fiber crosses. According to the description of Patent Document 1, since the cut end opens at the time of molding, the shapeability is improved.

JP 2008-132775 A

  In the prior art described in Patent Document 1, a plurality of reinforcing fiber layers are integrated by stitching together with stitch yarns. For this reason, the reinforcing fiber is restrained relatively strongly by the stitch yarn. In particular, when three or more reinforcing fiber layers are laminated, the contact area between the reinforcing fiber layer positioned inward and the reinforcing fiber layers positioned above and below the reinforcing fiber layer is increased, so that the friction resistance is increased. growing. For the reasons described above, the reinforcing fibers are difficult to move or slip, so that it is difficult to say that sufficient formability is obtained.

  Moreover, forming a cut end means cutting the reinforcing fiber in the middle in the longitudinal direction. For this reason, it is difficult to increase the strength and elastic modulus.

  The present invention has been made to solve the above-described problems, and has a reinforcing fiber base material that exhibits excellent strength and elastic modulus and excellent shapeability, a fiber-reinforced resin molded article having the same, and a method for producing the same The purpose is to provide.

In order to achieve the above object, the present invention provides a sheet body integrated by stitching together a plurality of first continuous fibers arranged in parallel so as to extend along a predetermined direction by stitch yarns. A reinforcing fiber substrate having
A front side fiber layer and a back side fiber layer are respectively formed by a plurality of second continuous fibers arranged in parallel and spaced apart from each other on the front and back surfaces of the sheet body,
The front-side fiber layer and the back-side fiber layer are held on the sheet body by the intersection of the stitch yarn with the second continuous fiber riding on the second continuous fiber.

  In the sheet body in the present invention, the longitudinal direction of the first continuous fiber functioning as the reinforcing fiber is oriented in a predetermined direction. That is, the first continuous fibers do not intersect each other. Moreover, the fiber layer formed by arranging the plurality of first continuous fibers in parallel is a single layer. For the reasons as described above, the first continuous fiber does not restrain another first continuous fiber. On the other hand, the front side fiber layer and the back side fiber layer sandwiching the first continuous fibers are composed of second continuous fibers spaced apart from each other. For this reason, since the contact area of a 1st continuous fiber, a front side fiber layer, and a back side fiber layer is small, the frictional resistance between both is also small.

  For the reasons described above, the first continuous fiber is easy to move or slip when applied with pressure to form the reinforcing fiber base material. For this reason, the reinforcing fiber base is easily deformed when preforming. Therefore, for example, it is possible to obtain a molded product having a large processing rate by performing deep drawing.

  Thus, in this invention, the reinforced fiber base material which shows the outstanding shaping property can be obtained. Moreover, since it is not necessary to cut | disconnect a sheet | seat body, this reinforcement fiber base material is excellent also in intensity | strength and an elasticity modulus. Further, when the second continuous fiber functions as a reinforcing fiber, a further excellent strength is provided.

  The stitch yarn preferably extends in a direction inclined with respect to the extending direction of the first continuous fibers, that is, intersects with the longitudinal direction of the first continuous fibers at an angle other than 90 °. In this case, the circumferential length of the stitch yarn surrounding the first continuous fiber is longer than that when the stitch yarn is orthogonal to the carbon fiber (intersects at 90 °). The binding force of continuous fibers is reduced. This is because when the stitch yarn is pulled along with the applied pressure, a sufficient margin is generated until the stitch yarn is tensioned.

  Therefore, in this case, it becomes easier for the first continuous fiber to move or slip. That is, molding can be performed more easily.

  The second continuous fiber also preferably extends in a direction inclined with respect to the extending direction of the stitch yarn. In this case, for the same reason as described above, the binding force of the stitch yarn on the second continuous fiber is reduced. Therefore, it is avoided that the second continuous fiber is constrained and that it is difficult to form the reinforcing fiber base due to this.

  In addition, it is preferable that a 2nd continuous fiber extends in directions other than a parallel direction with respect to the extension direction of a 1st continuous fiber, ie, a 2nd continuous fiber cross | intersects with a 1st continuous fiber. Since the longitudinal directions of the first continuous fibers are aligned, the reinforcing fiber substrate exhibits excellent strength and elastic modulus along the longitudinal direction of the first continuous fibers. In addition to this, when the second continuous fiber extends along a direction other than the extending direction of the first continuous fiber, the reinforcing fiber base material has excellent strength even in the longitudinal direction of the second continuous fiber. This is because the elastic modulus is exhibited. The most suitable crossing angle between the first continuous fiber and the second continuous fiber is 90 °.

  Furthermore, the second continuous fiber is preferably a twisted yarn in which a plurality of fiber materials are twisted together. In this case, since the 2nd continuous fiber comes to show the further outstanding intensity | strength, elastic modulus, etc., a reinforcement fiber base material also comes to show the further outstanding intensity | strength, elastic modulus, etc.

  As materials for the first continuous fiber and the second continuous fiber, those that do not melt when heated on the reinforcing fiber base during molding are selected. A preferred embodiment of the first continuous fiber is carbon fiber, while a preferred embodiment of the second continuous fiber is glass fiber, aramid fiber or carbon fiber.

  In addition, a fiber-reinforced resin molded article according to the present invention includes the above-described reinforcing fiber base material and a matrix resin impregnated in the reinforcing fiber base material. Since the reinforcing fiber base is excellent in strength and elastic modulus, this fiber reinforced resin molded product is also excellent in strength and elastic modulus. Moreover, since the processing rate of a reinforced fiber base material can be enlarged, it is also possible to obtain what has unevenness | corrugations with a large level | step difference as a fiber reinforced resin molded product, for example.

Furthermore, the method for producing a fiber-reinforced resin molded article according to the present invention includes a step of performing preforming on the above-described reinforcing fiber base,
A step of impregnating a softened matrix resin with respect to the reinforcing fiber base that has been preformed;
Curing the matrix resin impregnated in the reinforcing fiber substrate to obtain a fiber-reinforced resin molded article;
It is characterized by having.

  By obtaining such a process, it is possible to obtain a fiber-reinforced resin molded article having excellent dimensional accuracy at a low cost.

  According to the present invention, a plurality of second continuous fibers are arranged in parallel with a single fiber layer formed by arranging the first continuous fibers whose longitudinal directions are directed in a predetermined direction. It is made to pinch | interpose by the front side fiber layer comprised by this, and a back side fiber layer. For this reason, the first continuous fibers do not restrain each other, and since the frictional resistance between the first continuous fibers, the front side fiber layer and the back side fiber layer is small, the pressure is applied to form the reinforcing fiber base material. The first continuous fiber is easy to move or slip.

  For the reasons described above, the reinforcing fiber base is easily deformed when preforming. That is, the reinforcing fiber substrate exhibits excellent formability. Therefore, for example, it becomes easy to obtain a molded product having a large processing rate by performing deep drawing. Moreover, since it is not necessary to cut | disconnect a sheet | seat body, this reinforcement fiber base material and a molded article are excellent also in intensity | strength and an elasticity modulus.

It is a principal part expansion perspective view of the reinforced fiber base material which concerns on embodiment of this invention. It is a principal part enlarged plan view which shows the intersection of a 1st continuous fiber and a stitch thread | yarn. It is sectional drawing along the thickness direction of a reinforced fiber base material. 4A to 4G are flowcharts showing a process of stitching the first continuous fibers with stitch yarns. It is a principal part expanded sectional view when a reinforcing fiber base material is clamped.

  Hereinafter, preferred embodiments of the reinforced fiber base material according to the present invention will be described in detail with reference to the accompanying drawings by giving preferred embodiments in relation to a fiber reinforced resin molded product having the reinforced fiber substrate and a manufacturing method thereof.

  FIG. 1 is an enlarged perspective view of a main part of a reinforcing fiber substrate 10 according to the present embodiment. The reinforcing fiber base 10 includes a sheet body 16 that is integrated by stitching first continuous fibers (carbon fibers 12 described later) that are reinforcing fibers with stitch yarns 14. In the following, an example in which carbon fibers are used as the first continuous fibers will be described.

  Each carbon fiber 12 is a bundle of thousands to tens of thousands of single fibers having a diameter of 5 to 15 μm, typically about 7 μm. The single fibers contained in one bundle of carbon fibers 12 are aligned in the direction of the arrow X in FIG. Further, the longitudinal directions of the plurality of carbon fibers 12 are also aligned in the arrow X direction. That is, the carbon fibers 12 are juxtaposed so as to extend along the X direction.

  In the present embodiment, the carbon fibers 12 are not laminated. That is, the carbon fibers 12 in the sheet body 16 form a single fiber layer.

  The stitch yarn 14 is made of, for example, a known polymer fiber. Specific examples thereof include polyester fiber, nylon fiber, and aramid fiber.

  The stitch yarn 14 extends along the Y direction that intersects the extending direction (X direction) of the carbon fibers 12 at a predetermined angle (an angle other than 90 °). Eventually, the longitudinal direction (extending direction) of the stitch yarn 14 is inclined with respect to the longitudinal direction (extending direction) of the carbon fiber 12, as shown in FIG. The angle formed by the X direction and the Y direction can be set to 45 °, for example.

  A front-side fiber layer 18 and a back-side fiber layer 20 are formed on the front surface 16a and the back surface 16b (see also FIG. 5) of the sheet body 16 so as to sandwich the carbon fiber 12 therebetween. The front side fiber layer 18 is configured by arranging a plurality of second continuous fibers (glass fibers 22 described later) in parallel so as to be separated from each other at a predetermined interval, and the back side fiber layer 20 is configured in the same manner.

  The second continuous fiber can be composed of a polymer fiber or an inorganic fiber. Preferable examples of the polymer fibers include aramid fibers and the like, and preferable examples of the inorganic fibers include glass fibers and carbon fibers 12. In the following, an example in which glass fibers are used as the second continuous fibers will be described.

  In the present embodiment, the glass fiber 22 includes a fiber bundle formed by bundling hundreds (for example, 400) of single fibers having a diameter of 5 to 10 μm, typically about 9 μm. More specifically, the glass fiber 22 is a twisted yarn obtained by twisting about 2 to 3 fiber bundles, and has a diameter of 50 to 100 μm, typically about 70 μm.

  The glass fiber 22 extends along the Z direction that intersects the extending direction (Y direction) of the stitch yarn 14 at a predetermined angle (an angle other than 90 °). Accordingly, the longitudinal direction (extending direction) of the glass fiber 22 is inclined with respect to the longitudinal direction (extending direction) of the stitch yarn 14. The angle formed by the Y direction and the Z direction can be set to 45 °, for example.

  On the other hand, the glass fiber 22 also intersects with the carbon fiber 12. That is, the extending direction of the glass fiber 22 (Z direction) and the extending direction of the carbon fiber 12 (X direction) are not parallel. In other words, the glass fiber 22 extends in a direction other than the direction parallel to the extending direction of the carbon fiber 12. The angle formed by the Z direction and the X direction can be set to 90 °, for example. Of course, it may be an angle other than 90 °.

  As shown in FIG. 3, the stitch yarn 14 straddles the glass fiber 22 at a location (intersection) where the stitch yarn 14 intersects the glass fiber 22. That is, the intersecting portion rides on the glass fiber 22, whereby the glass fiber 22 is held by the sheet body 16. The number of intersections between one stitch yarn 14 and one glass fiber 22 is one. In addition, although the back side fiber layer 20 is abbreviate | omitted in FIG. 3, the glass fiber 22 which comprises the back side fiber layer 20 is similarly hold | maintained at the sheet | seat body 16. FIG. The stitch yarn 14 gently restrains the carbon fiber 12 and the glass fiber 22.

  In the reinforcing fiber base 10, a plurality of glass fibers 22 are juxtaposed on the carbon fiber 12 so as to be separated from each other at a predetermined interval, and then stitched with the stitch yarn 14 as shown in FIGS. 4A to 4G. Obtained by. For suturing, a needle 30, a tongue 34 that slides in a groove 32 formed in the needle 30, and a guide 36 are used. The hook portion 38 provided at the tip of the needle 30 is opened and closed as the tongue 34 slides (up and down) in the groove 32. Moreover, in FIG. 4A-FIG. 4G, the glass fiber 22 is abbreviate | omitted for easy understanding.

  FIG. 4A shows a state immediately after the stitch yarn 14 has entered after passing the loop portion 40 between the adjacent carbon fibers 12 and 12. At this time, the needle 30 is located on the back surface 16b side. At this time, the hook portion 38 around which the stitch yarn 14 is hooked is closed by the tongue 34. Therefore, the stitch yarn 14 is prevented from falling off the hook portion 38. The guide 36 that has received the stitch yarn 14 extending from the hook portion 38 is positioned above the carbon fiber 12 adjacent to the carbon fiber 12 adjacent to the needle 30 on the surface 16a side.

  Next, as shown to FIG. 4B, the carbon fiber 12 is sent out to the right side in a figure. Further, only the needle 30 is raised, and the hook portion 38 enters between the adjacent carbon fibers 12 and 12. For this reason, the tongue 34 comes into sliding contact with the groove 32 of the needle 30 and descends relatively. As a result, the hook part 38 opens. The guide 36 is not displaced from the position shown in FIG. 4A.

  Next, as shown in FIG. 4C, the needle 30 is further raised and the hook portion 38 protrudes toward the surface 16a. For this reason, the stitch yarn 14 hooked on the hook portion 38 moves relatively to the main body (shaft portion) of the needle 30. On the other hand, the tongue 34 rises while being in sliding contact with the groove 32 of the needle 30, and after its tip passes through the loop portion 40, it enters between the adjacent carbon fibers 12, 12. Further, the guide 36 passes through the front (or the back) of the needle 30 and is displaced toward the left in the drawing. Along with this, the stitch yarn 14 is detached from the hook portion 38.

  As shown in FIG. 4D and FIG. 4E, when the needle 30 and the tongue 34 reach the uppermost point, the guide 36 once passed over the needle 30 passes through the back (or in front) of the needle 30 to the right in the drawing. Try to return. At this time, the stitch yarn 14 is caught on the hook portion 38.

  Thereafter, as shown in FIG. 4F, the guide 36 further advances toward the right in the drawing, and only the needle 30 is lowered. At this time, the loop portion 40 relatively moves to the hook portion 38. Further, the stitch yarn 14 hooked on the hook portion 38 enters between the adjacent carbon fibers 12 and 12 together with the hook portion 38. At the same time, the hook portion 38 is closed by the tongue 34 that is slid in the groove 32 and relatively raised.

  And as shown to FIG. 4G, the needle 30 and the tongue 34 descend | fall and are located in the back surface 16b side. As a result, the loop portion 40 is detached from the needle 30 and the tongue 34, and a new loop portion 40 is formed in the hook portion 38.

  By repeating this, the stitch yarn 14 extends along the Y direction so that the loop portions 40 are connected to each other. As a result, the carbon fibers 12 are stitched and bound to form the sheet body 16. Further, in this process, the glass fiber 22 is stitched to the sheet body 16 as the intersection with the glass fiber 22 rides on the glass fiber 22. As a result, the reinforcing fiber base 10 is obtained.

  Only the next loop portion 40 is gently passed through the loop portion 40, and the stitch yarn 14 is not pulled (not strained). That is, the stitch yarn 14 is relaxed. Moreover, the stitch yarn 14 intersects with the carbon fiber 12 so as to be inclined (see a solid line in FIG. 2). In this case, the circumference of the stitch yarn 14 surrounding the carbon fiber 12 is longer than when the stitch yarn 14 intersects the carbon fiber 12 so as to be orthogonal (see the broken line in FIG. 2). In combination with the above, there is a sufficient margin until the stitch yarn 14 is tensioned when the stitch yarn 14 is pulled.

  Next, a fiber reinforced resin molded product (FRP molded product) including the reinforced fiber base material 10 will be described in relation to its manufacturing method.

  In order to obtain an FRP molded product, first, the reinforcing fiber base 10 is heated, and the edges of the reinforcing fiber base 10 are clamped by a plurality of clamps 50 as shown in FIG. In FIG. 5, the site | part clamped by the clamp 50 is expanded and shown.

  Then, preforming is performed using a preforming mold having a lower mold and an upper mold. In addition, for example, the reinforcing fiber base 10 may be heated by placing the reinforcing fiber base 10 on a heated lower mold, and then the mold may be closed to perform preliminary molding. Since the melting point of the glass fiber 22 is 800 ° C. or higher and the heating temperature of the reinforcing fiber base 10 is about 100 to 120 ° C., the glass fiber 22 does not melt.

  At this time, the reinforcing fiber base 10 is deformed following the shape of the cavity of the preforming mold. That is, the reinforcing fiber base 10 is pulled so as to be drawn into the preforming die while being sandwiched by the clamp 50.

  Here, the reinforcing fiber substrate 10 according to the present embodiment includes a front-side fiber layer 18 and a back-side fiber layer 20 formed so as to sandwich the carbon fiber 12 (sheet body 16). The front side fiber layer 18 and the back side fiber layer 20 are composed of a plurality of glass fibers 22 spaced apart from each other. For this reason, the contact area of the carbon fiber 12, and the front side fiber layer 18 and the back side fiber layer 20 is remarkably small. Accordingly, the frictional resistance between the carbon fiber 12 and the front-side fiber layer 18 and the back-side fiber layer 20 is also extremely small.

  Moreover, since the carbon fiber 12 is a single layer, the carbon fiber 12 is not restrained by other carbon fibers 12. In addition, the stitch yarn 14 only gently restrains the glass fiber 22 and the carbon fiber 12.

  For the reasons as described above, the carbon fibers 12 in the reinforcing fiber base material 10 easily move (or slip) even though the edge of the reinforcing fiber base material 10 is sandwiched by the clamp 50. . For this reason, the reinforcing fiber base 10 is easily deformed following the cavity. In short, the reinforcing fiber substrate 10 exhibits excellent formability. Therefore, for example, even when the processing rate is increased, for example, when deep drawing is performed, a preformed product having a shape / dimension approximately the same as the shape / dimension of the final product (FRP molded product) is obtained. Can do.

  Next, the preform is taken out from the preform and conveyed to a main mold provided with an injection device. Further, the mold is closed and the molten resin is injected from the injection device into the cavity. If necessary, the preform may be further molded as the mold is closed.

  Here, as the molten resin, a softened resin such as a thermosetting resin or a mixture of a thermosetting resin and a thermoplastic resin is used. Specific examples of suitable thermosetting resins are epoxy resins, unsaturated polyester resins, vinyl ester resins, phenol resins and the like. Specific examples of suitable thermoplastic resins are polyester, polyamideimide, polyimide, polyethylene and the like.

  The injected molten resin flows along the cavity of the main mold and penetrates into the gap between the carbon fibers 12 constituting the reinforcing fiber base 10. That is, the molten fiber base material 10 is impregnated with the molten resin. Since the temperature of the molten resin is much lower than the melting point of the glass fiber 22, the glass fiber 22 is not melted even at this point.

  In this state, the molten resin is cooled and cured to become a matrix resin, whereby a fiber reinforced resin material in which the reinforced fiber substrate 10 is impregnated with the matrix resin is obtained as a molded product. That is, an FRP molded product molded into a predetermined shape is produced. The FRP molded product is finally removed from the mold.

  As described above, in this embodiment, the sheet body 16 is interposed between the front side fiber layer 18 and the back side fiber layer 20 and the restraint by the stitch yarn 14 is moderated. Is excellent in formability. For this reason, since a preform having a shape and size substantially the same as the shape and size of the FRP molded product is obtained, post-processing after the main molding is simplified.

  In addition, in this case, it is not necessary to cut the carbon fibers 12 constituting the reinforcing fiber base 10. For this reason, the outstanding intensity | strength and elastic modulus of the reinforced fiber base material 10 are maintained. Therefore, the FRP molded product is also excellent in strength and elastic modulus.

  In the FRP molded product, not only the carbon fiber 12 but also the glass fiber 22 functions as a reinforcing fiber. In addition, since the glass fiber 22 is a twisted yarn, sufficient strength and elastic modulus are exhibited.

  Here, the extending direction (Z direction) of the glass fibers 22 is different from the extending direction (X direction) of the carbon fibers 12. Therefore, the carbon fiber 12 can improve the strength and elastic modulus in the X direction, and the glass fiber 22 can improve the strength and elastic modulus in the Z direction. In particular, when the X direction and the Z direction are orthogonal, it is preferable because the strength and elastic modulus of both the longitudinal direction of the carbon fiber 12 and the direction orthogonal thereto can be improved.

  After all, according to the present embodiment, it is possible to obtain an FRP molded product having good dimensional accuracy and exhibiting excellent strength and elastic modulus at low cost.

  The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, the extending direction of the glass fibers 22 constituting the front side fiber layer 18 and the extending direction of the glass fibers 22 constituting the back side fiber layer 20 may be the same or may be orthogonal to each other.

10 ... Reinforcing fiber base material 12 ... Carbon fiber (first continuous fiber)
DESCRIPTION OF SYMBOLS 14 ... Stitch thread 16 ... Sheet body 18 ... Front side fiber layer 20 ... Back side fiber layer 22 ... Glass fiber (2nd continuous fiber) 30 ... Needle 32 ... Groove 34 ... Tong 36 ... Guide 38 ... Hook part 40 ... Loop part 50 ... Clamp

Claims (8)

A reinforcing fiber substrate having a sheet body integrated by stitching together a plurality of first continuous fibers arranged in parallel so as to extend along a predetermined direction by stitch yarns,
A front side fiber layer and a back side fiber layer are respectively formed by a plurality of second continuous fibers arranged in parallel and spaced apart from each other on the front and back surfaces of the sheet body,
The front-side fiber layer and the back-side fiber layer are held in the sheet body by the intersection of the stitch yarn with the second continuous fiber riding on the second continuous fiber. Base material.   The reinforcing fiber substrate according to claim 1, wherein the stitch yarn extends in a direction inclined with respect to an extending direction of the first continuous fibers.   3. The reinforcing fiber substrate according to claim 1, wherein the second continuous fiber extends in a direction inclined with respect to an extending direction of the stitch yarn.   The base material according to claim 3, wherein the second continuous fiber extends in a direction other than a parallel direction with respect to an extending direction of the first continuous fiber.   5. The reinforced fiber substrate according to claim 1, wherein the second continuous fiber is a twisted yarn in which a plurality of fiber materials are twisted together.   The base material according to claim 1, wherein the first continuous fiber is a carbon fiber, and the second continuous fiber is any one of a glass fiber, an aramid fiber, or a carbon fiber. Reinforced fiber base material.   A fiber-reinforced resin molded article comprising the reinforcing fiber base according to any one of claims 1 to 6 and a matrix resin impregnated in the reinforcing fiber base. A step of preforming the reinforcing fiber base according to any one of claims 1 to 6,
A step of impregnating a softened matrix resin with respect to the reinforcing fiber base that has been preformed;
Curing the matrix resin impregnated in the reinforcing fiber substrate to obtain a fiber-reinforced resin molded article;
A method for producing a fiber-reinforced resin molded product, comprising:

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