JP5619399B2 - Molding method for fiber reinforced plastic structure and fiber reinforced plastic structure - Google Patents

Description

  The present invention relates to a method for forming a fiber-reinforced plastic structure, which is formed using a fiber-reinforced sheet having a plurality of fiber-reinforced plastic wires aligned in the longitudinal direction (hereinafter referred to as “fiber-reinforced plastic strand sheet”). And a fiber-reinforced plastic structure.

Conventionally, as a method of producing a fiber reinforced plastic structure,
(1) Drawing method (2) Hand lay-up method (including oven method and autoclave method)
(3) Resin transfer molding method (hereinafter referred to as “RTM method”)
(4) There is a hot press method. The above molding method will be briefly described below.

(1) Drawing method In the drawing method, round pipes for streetlight poles, pipes for building materials, angles, channels, H-shaped structural members, etc. are mainly manufactured (see, for example, Patent Document 1). ).

  Since the fibers used are mainly glass fibers, the elastic modulus such as bending is low, and therefore, it is not possible to enter a metal substitute application such as aluminum. At present, the focus is on corrosion-resistant applications that cannot be handled by metals.

  As countermeasures against this, it has been proposed to use it together with carbon fiber. However, the current molding method has a structure in which the fiber is forcibly pulled into the mold at the molding stage, so carbon fiber breakage, misalignment, yarn Is not used because the effect of putting in carbon fiber cannot be expected.

  The resin used in the pultrusion method is mainly unsaturated polyester resin or vinyl ester resin, and a large amount of clay powder (clay powder), aluminum hydroxide powder, etc. In response to demands for cost reduction and flame retardancy. When these are introduced, the strength and the modulus of elasticity of the carbon fiber decrease, and there is a problem that the effect cannot be enjoyed even if expensive carbon fiber is inserted, and the use is not progressing.

  On the other hand, a drawing apparatus that can use carbon fiber is also conceivable, but the actual situation is that the cost increase is large and it cannot be handled at all.

(2) Hand lay-up method (including oven method and autoclave method)
The hand lay-up method is a method for molding a fiber-reinforced plastic structure that is used in various applications mainly using long fibers such as glass fibers, carbon fibers, and aramid fibers. The materials used are mainly cloth woven fabrics, unidirectional woven fabrics, strand mats, etc. that are not impregnated with resin. Sometimes, however, long fibers are cut just before molding and then blown onto the molding surface with resin. (For example, refer to Patent Documents 2, 3, and 4).

  Applications range from small structures such as trash cans and sewage tanks to large ones such as windmill blades and small boats when glass fiber is used, but they are basically used in fields that require low cost. .

  The molding method in this case is simply to manually laminate a long-fiber woven fabric or strand mat while impregnating the resin, and the resin is mainly a room-temperature curing type, and how to make it inexpensively.

  Recently, however, there has been a demand for lighter, stronger, and elastic structures with a focus on windmill blades and small ships, and attempts have been made to combine them with carbon fibers. At that time, if the reinforcing fiber sheet is impregnated with resin and laminated in multiple layers, the fibers will inevitably fluctuate, making it impossible to fully demonstrate the performance of the yarn, resulting in large variations in molding and guaranteeing the performance of the structure. The fact is that there is a problem that cannot be done and we are working to solve this problem.

  On the other hand, carbon fibers are used in fields requiring high functions such as airplane members, liquid crystal device members, and vehicle members, and aramid fibers are used for members that require insulation and impact resistance, both of which are expensive. Used in applications for parts. Unlike the case of glass fibers, these molding methods use a material such as a prepreg that is pre-impregnated with resin in a long-fiber woven fabric, etc., and manually laminates it with a bag film. A method is adopted in which air is drawn with a vacuum pump until the inside of the laminate is brought into close vacuum so that the laminate is completely adhered, and then placed in a heating oven to cure the resin. Higher-grade products use a method in which they are placed in an autoclave instead of a heating oven and external pressure is applied in the heat-curing stage.

  By doing this, the physical properties of the yarn can be expressed almost 100%, and a good performance can be obtained. However, the cost is increased by using a large number of manpower and devices, and only expensive methods can be applied.

(3) RTM method In the RTM method, a fabric or strand mat not impregnated with resin is laminated, a bag film is placed around it, air in the bag film is drawn with a vacuum pump, and one side is connected to the resin inflow pipe. In this method, the resin is soaked into the laminated woven fabric or the like by the force of drawing the vacuum, and then the resin is cured to obtain a molded product (see, for example, Patent Documents 5 and 6). When the resin is soaked, if the pressure is insufficient, the resin is pumped up and forcedly soaked.

  In addition, this method is the same, but a fabric that is not impregnated with resin is laminated in the mold, the mold is sealed, the mold is pulled with a vacuum pump, and the resin flows in on one side. There is also a way to make it. In this case, the mold is a heating mold, and after impregnation with the resin, the mold is heated to cure the resin.

  The problem with this molding method is that, as with the hand lay-up molding method, the reinforcing fibers fluctuate when the resin flows, and the physical properties of the reinforcing fibers cannot be fully exhibited. Further, in the case of a thick molded product, it is difficult for the resin to penetrate uniformly, and in order to improve the resin flow, an extra material such as a strand mat for resin flow must be inserted between the layers.

(4) Hot press method In hot press molding, a sheet in which a reinforcing fiber sheet is impregnated with a resin in advance is basically used. In general, an SMC material using short reinforcing fibers such as chopped strands such as glass fiber and carbon fiber is used (see, for example, Patent Document 7). Since products made of SMC materials have short reinforcing fibers, they can only be used for applications such as bathtubs and home appliance covers that do not require much strength and elastic modulus.

  Recently, application to automobile parts that require more strength and elastic modulus in combination with a prepreg in which a continuous reinforcing fiber sheet is impregnated with resin has been studied, but due to the difference in resin between SMC material and prepreg material The present situation is that it has not been put into practical use due to the problem of poor adhesiveness and the problem that the physical properties of the reinforcing fibers cannot be fully exhibited due to the occurrence of yarn fluctuation due to resin flow at the molding stage.

JP-A-8-34065 JP 2006-70476 A JP-A-6-74142 JP 2001-79866 A Japanese Patent Laid-Open No. 2004-174776 JP 2004-181627 A JP 2004-35714 A

Therefore, the main object of the present invention is to
(1) Pull-out molding method (2) Hand layup method (3) RTM method (4) Tensile strength that could not be obtained by using a fiber-reinforced plastic strand sheet in the hot press method Another object of the present invention is to provide a molding method capable of improving mechanical properties such as tensile elastic modulus, compressive strength, compressive elastic modulus, bending strength, bending elastic modulus and the like, and a fiber reinforced plastic structure.

The above object is achieved by the method for molding a fiber reinforced plastic structure and the fiber reinforced plastic structure according to the present invention. In summary, the present invention is a molding method in which a plurality of reinforcing fiber sheets are laminated, and a fiber reinforced plastic structure is molded by a pultrusion molding method, a hand layup method, a resin transfer molding method, or a hot press method.
At the time of molding of the structure, the outer surface of the substrate to be formed by the reinforcing fibers of the sheet laminating a plurality, at least a fiber-reinforced plastic strands sheets having aligned pulling a plurality of fiber-reinforced plastic wire in the longitudinal direction A method for molding a fiber-reinforced plastic structure, wherein one sheet is placed and simultaneously molded using a resin molded by the molding method.

  According to one embodiment of the present invention, the reinforcing fiber of the fiber reinforced plastic wire contains carbon fiber having a tensile strength of 3000 MPa or more and a tensile elastic modulus of 230 GPa or more in a volume fraction of 50% or more. The strength is 900 MPa or more and the tensile modulus is 69 GPa or more. According to another embodiment, the reinforcing fiber of the fiber reinforced plastic wire is a carbon fiber having a tensile strength of 3000 MPa or more and a tensile elastic modulus of 230 GPa or more other than a carbon fiber having a tensile strength of less than 3000 MPa and a tensile elastic modulus of less than 230 GPa. ; Metal fiber such as boron fiber, titanium fiber, steel fiber; Organic fiber such as aramid, PBO (polyparaphenylene benzbisoxazole), polyamide, polyarylate, polyester; Used.

  According to another embodiment of the present invention, the matrix resin of the fiber reinforced plastic wire may be a room temperature curing type or thermosetting type epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, or phenol resin. It is a curable resin or a thermoplastic resin such as nylon or vinylon.

  According to another embodiment of the present invention, the fiber-reinforced plastic wire has a circular cross-sectional shape with a diameter of 0.5 to 3 mm, or a width of 1 to 20 mm and a thickness of 0.1 to 5 mm. It has a rectangular cross-sectional shape.

  According to another embodiment of the present invention, the strand sheet made of fiber reinforced plastic is arranged in parallel with a plurality of continuous fiber reinforced plastic wire rods having predetermined gaps as warps. A sheet-like woven fabric in which wefts are woven into a plurality of fiber reinforced plastic wires at predetermined intervals along the longitudinal direction of the fiber reinforced plastic wires.

  According to another embodiment of the present invention, the weft in the fiber-reinforced plastic strand sheet is made of carbon fiber, glass fiber, cotton, or aramid fiber, polyamide fiber, polyvinyl alcohol fiber, polyethylene alcohol fiber or polyethylene terephthalate fiber. These yarns are woven at intervals of 1 to 250 mm along the longitudinal direction of the fiber-reinforced plastic wire.

  According to another embodiment of the present invention, the fiber reinforced plastic wires in the fiber reinforced plastic strand sheet are spaced apart from each other at a distance of 0.1 to 3 mm.

According to another embodiment of the present invention, the fiber-reinforced plastic strands sheet in which a plurality of sheets stacked, aligned direction of the fiber-reinforced plastic wire of the fiber-reinforced plastic strands sheets differently to the product layer.

  According to another embodiment of the present invention, a reinforcing fiber sheet is disposed as an outer surface layer of the fiber-reinforced plastic strand sheet.

  According to another embodiment of the present invention, the reinforcing fiber sheet may be a cross fabric, a unidirectional fabric, a strand mat, or a short cut formed into a sheet shape using glass fibers, aramid fibers, or carbon fibers. This is a sheet-like SMC material formed by impregnating a resin into the formed fiber in advance to form a sheet.

  According to another embodiment of the present invention, the resin molded by the molding method is a room temperature curing type or thermosetting type epoxy resin, unsaturated polyester resin, vinyl ester resin, MMA resin, or phenol resin. It is a thermosetting resin or a thermoplastic resin such as nylon or vinylon.

  According to another aspect of the present invention, there is provided a fiber reinforced plastic structure produced by a method for molding a fiber reinforced plastic structure having any one of the above-described configurations.

According to the present invention, since it has the required mechanical strength, and does not cause fluctuation of the fiber at the time of molding, it is molded using a fiber reinforced plastic strand sheet that has been resin-cured in advance.
(1) Pull-out molding method (2) Hand lay-up method (3) RTM method (4) In hot molding method, even if the same inexpensive resin as before is used, the structure as designed in advance It is possible to provide a fiber-reinforced plastic structure having improved mechanical properties such as tensile strength, tensile elastic modulus, compressive strength, compressive elastic modulus, bending strength, and bending elastic modulus.

It is a schematic diagram which shows the general | schematic cross-section structure of one Example of the structure made from fiber reinforced plastics produced by this invention. It is a perspective view which shows one Example of the fiber reinforced plastic strand sheet | seat used for this invention. It is sectional drawing of the fiber reinforced plastic wire which comprises the fiber reinforced plastic strand sheet | seat used for this invention. It is a perspective view which shows the other Example of the fiber-reinforced plastic strand sheet | seat used for this invention. It is a perspective view which shows the other Example of the fiber-reinforced plastic strand sheet | seat used for this invention. It is a schematic diagram explaining the pultrusion molding method using the fiber-reinforced plastic strand sheet which concerns on this invention. It is a schematic diagram explaining the hand lay-up method using the fiber-reinforced plastic strand sheet which concerns on this invention. It is a schematic diagram explaining the hand lay-up method using the fiber-reinforced plastic strand sheet which concerns on this invention. It is a schematic diagram explaining the RTM method using the fiber-reinforced plastic strand sheet which concerns on this invention. It is a schematic diagram explaining the hot press method using the fiber-reinforced plastic strand sheet which concerns on this invention. It is a perspective view of one Example which shows the coupling body of the fiber-reinforced plastic strand sheet | seat and other fiber reinforced sheet | seats used for this invention. FIG. 12A is a schematic diagram showing a schematic cross-sectional configuration of an implementation test material that is a test piece having a configuration according to the present invention, and FIG. 12B and FIG. 12C are comparative examples that are comparative examples. It is a schematic diagram which shows schematic sectional structure of a test material.

  The fiber-reinforced plastic structure molding method and the fiber-reinforced plastic structure according to the present invention will be described below in more detail with reference to the drawings.

Example 1
FIG. 1 shows an example of a schematic cross-sectional configuration of a fiber-reinforced plastic structure 100 molded by the molding method of the present invention.

  According to the present embodiment, a fiber reinforced plastic structure 100 formed by using a fiber reinforced sheet having a plurality of fiber reinforced plastic wires 2 aligned in the longitudinal direction, that is, a fiber reinforced plastic strand sheet 1, has a structure. It has a base body 101 that forms an object structure, and an outer surface layer 102 that constitutes a surface portion that is integrally formed on the upper surface of the base body 101. If necessary, the outer surface layer 102 can also be disposed on the surface on the opposite side of the substrate 101 as indicated by the alternate long and short dash line.

  In addition, although it demonstrates in detail in Example 2, the outer surface layer 105 (refer FIG. 8) can also be provided in the outer surface of the outer surface layer 102 used as the fiber reinforced plastic strand sheet 1 as needed.

  The fiber reinforced plastic structure 100 will be described in more detail.

(Substrate)
The base 101 of the fiber reinforced plastic structure 100 is a fiber reinforced plastic structure in which a plurality of reinforcing fiber sheets 103 are laminated.

  The reinforcing fiber sheet 103 is a cloth, unidirectional fabric, strand mat, or short cut fiber formed into a sheet shape using glass fiber, aramid fiber, or carbon fiber, which is well known to those skilled in the art. A sheet-like SMC material or the like that is previously impregnated with a resin and formed into a sheet shape.

(Outer surface layer)
The outer surface layer 102 has a fiber reinforced plastic layer cured by disposing at least one fiber reinforced plastic strand sheet 1 on the outer surface of a fiber reinforced plastic structure 101 as a base, impregnating a resin (adhesive) 104. It is said.

  As the resin 104, a commonly used matrix resin for impregnation is used. For example, a room temperature curing type or thermosetting type epoxy resin, an unsaturated polyester resin, a vinyl ester resin, an MMA resin, or a phenol resin is used. A thermosetting resin or a thermoplastic resin such as nylon or vinylon is used.

  If necessary, a desired number of fiber-reinforced plastic strand sheets 1 can be laminated on the substrate 101 while impregnating the resin 104.

  As described above, the substrate 101 and the surface portion (outer surface layer) that are made into fiber reinforced plastic by curing the fiber reinforced sheet 101 laminated and impregnated with the resin 104 and the impregnated resin 104 of the strand sheet 1 made of fiber reinforced plastic. ) 102 is formed.

  Thus, by forming the outer surface layer 102 on the fiber reinforced plastic structure 101, the fiber reinforced plastic structure 101 is reinforced, and the tensile strength, tensile elastic modulus, compressive strength, compressive elastic modulus, bending strength of the structure 100 are increased. In addition, mechanical properties such as flexural modulus are improved.

(Fiber-reinforced plastic strand sheet)
Next, the fiber reinforced plastic strand sheet 1 constituting the outer surface layer 102 will be described.

  2 and 3 show an embodiment of a fiber-reinforced plastic strand sheet 1 used for the outer surface layer 102 of the structure according to the present invention.

  The strand sheet 1 made of fiber reinforced plastic has a plurality of continuous fiber reinforced plastic wires 2 arranged in a slender shape in the longitudinal direction, and the wires 2 are fixed to each other by a wire fixing material 3.

  The fiber reinforced plastic wire 2 has an elongated shape (small diameter) in which a matrix resin R is impregnated with a plurality of continuous reinforcing fibers f oriented in one direction and cured, and has elasticity. Therefore, the fiber-reinforced plastic strand sheet 1 in which the elastic fiber-reinforced plastic wire 2 is formed in a sled shape, that is, in a sheet shape in which the wires 2 are arranged close to and away from each other, is elastic in the longitudinal direction. Have. Further, since the fiber reinforced plastic strand sheet 1 is composed of the fiber reinforced plastic wire 2, the orientation of the reinforced fibers is disturbed or the yarn breaks during transportation, like a conventional unimpregnated reinforced fiber sheet. There is no worry of it occurring.

  More specifically, as shown in FIGS. 3A and 3B, the thin fiber-reinforced plastic wire 2 has a substantially circular cross-sectional shape with a diameter (d) of 0.5 to 3 mm (FIG. 3A). Or a substantially rectangular cross-sectional shape having a width (w) of 1 to 20 mm and a thickness (t) of 0.1 to 5 mm (FIG. 3B). Of course, other various cross-sectional shapes can be used as necessary. Moreover, in order to improve the adhesive force at the time of use, it is preferable that the surface of the fiber reinforced plastic wire 2 is roughened by roughening using a blast, a paper file or the like.

  As described above, in the strand sheet 1 made of fiber-reinforced plastic that is aligned and slid in one direction, each wire 2 is either between the gaps (g) = 0.1 to 3 mm in FIG. Are fixed by the wire fixing material 3 at intervals of. Further, the length (L) and width (W) of the fiber-reinforced plastic strand sheet 1 formed in this way are appropriately determined according to the size and shape of the structure to be reinforced. From the problem, generally, the total width (W) is 100 to 1000 mm. Moreover, although the length (L) can manufacture a strip-shaped thing about 1-5 m, or a thing 100 m or more, it cuts and uses it suitably at the time of use.

  It is also possible to manufacture the fiber reinforced plastic strand sheet 1 with a length (L) of about 1 to 5 m and a width (W) of about 1 to 10 m longer than this. In this case, the fiber reinforced plastic wire 2 can be wound in a direction perpendicular to the fiber reinforced plastic wire 2 in a stretched state, and can be wound and conveyed.

  As the reinforcing fiber f, it is preferable to use carbon fiber in order to reduce the thickness, achieve weight reduction, and improve the mechanical strength and the like. In particular, the fiber-reinforced plastic strand sheet 1 is effectively used to reduce thickness, reduce weight, and mechanical properties (tensile strength, tensile elastic modulus, compressive strength, compressive elastic modulus, bending strength, bending elastic modulus, etc.) In order to obtain a fiber reinforced plastic structure with improved fiber strength, the reinforcing fiber f of the fiber reinforced plastic wire 2 contains 50% or more of carbon fibers having a tensile strength of 3000 MPa or more and a tensile elastic modulus of 230 GPa or more. It is preferable that the wire has a tensile strength of 900 MPa or more and a tensile modulus of 69 GPa or more. The content of carbon fiber having a tensile strength of 3000 MPa or more and a tensile modulus of 230 GPa or more is optimally 100% from the viewpoint of mechanical properties, but is usually 60 to 80% from the viewpoint of cost. . When the content of the carbon fiber f having a tensile strength of 3000 MPa or more and a tensile modulus of 230 GPa or more is less than 50%, the fiber other than the carbon fiber is 1 of a tensile modulus (about 70 GPa) such as glass fiber and aramid fiber. If it is not a wire rod having a tensile elastic modulus of 5 times or more, the effect as a reinforcing material is diminished, but rather the cost is increased and the advantage of weight reduction is not generated.

  As described above, when a carbon fiber having a tensile strength of 3000 MPa or more and a tensile modulus of elasticity of 230 GPa or more is used as the reinforcing fiber of the fiber-reinforced plastic wire 2, a fiber other than the carbon fiber is used in a predetermined amount of 50% or more. As carbon fibers having a tensile strength of less than 3000 MPa and a tensile modulus of less than 230 GPa; metal fibers such as boron fibers, titanium fibers, and steel fibers; Organic fibers can be used alone or in a hybrid mixed with a plurality of types.

  The matrix resin R impregnated in the fiber reinforced plastic wire 2 can be a thermosetting resin or a thermoplastic resin. As the thermosetting resin, a room temperature curing type or a thermosetting type epoxy resin, vinyl ester can be used. Resin, MMA resin, unsaturated polyester resin, phenol resin, or the like is preferably used, and nylon, vinylon, or the like can be preferably used as the thermoplastic resin. Further, the resin impregnation amount (Vm: volume%) is 30 to 70%, preferably 40 to 60%.

  In addition, as a method of fixing each wire 2 with the wire fixing material 3, for example, as shown in FIG. 2, wefts are used as the wire fixing material 3, and the wefts 3 are arranged in a sled shape in one direction. Alternatively, a method of driving and knitting at a constant interval (P) perpendicular to the wire 2 of a sheet made of a plurality of wires (that is, a continuous wire sheet) may be employed. The driving interval (P) of the weft yarn 3 is not particularly limited, but is usually selected in the range of 1 to 250 mm in consideration of the handleability of the produced fiber-reinforced plastic strand sheet 1.

  At this time, the weft 3 is, for example, a yarn in which a plurality of carbon fibers, glass fibers, cotton, or organic fibers having a diameter of 2 to 50 μm are bundled. As the organic fiber, an aramid fiber, a polyamide fiber, a polyvinyl alcohol fiber, a polyethylene alcohol fiber, a polyethylene terephthalate fiber, or the like is preferably used.

  Such a fiber reinforced plastic strand sheet 1 can also be produced by a loom system.

  That is, a plurality of continuous fiber reinforced plastic wires 2 are arranged in parallel with a predetermined gap between each other, and the longitudinal direction of the fiber reinforced plastic wire 2 is perpendicular to the plurality of fiber reinforced plastic wires 2 arranged in each other. The weft 3 is woven at a predetermined interval (P) along the direction, and a woven fabric woven into a sheet shape can be obtained.

Specifically, as shown in FIG.
(A) As warps, a plurality of continuous fiber reinforced plastic wires 2 are arranged in parallel with each other having a predetermined gap g, and auxiliary warps 5 are arranged between the fiber reinforced plastic wires 2 arranged in parallel. Arranged in parallel at a predetermined interval P0,
(B) Along the longitudinal direction of the fiber reinforced plastic wire 2 so as to be located on either side of the sheet-like fiber reinforced plastic wire 2 formed by a plurality of fiber reinforced plastic wires 2 arranged in parallel. The weft yarns 3 are arranged at a predetermined interval P, and the weft yarns 3 are woven into the warp yarns (fiber reinforced plastic wire material) 2 and the auxiliary warp yarns 5 so that a plurality of fiber reinforced plastic wire materials 2 arranged in parallel are arranged. Fixed in a sheet,
It is produced by.

Furthermore, as shown in FIG.
(A) As warps, a plurality of continuous fiber reinforced plastic wires 2 are arranged in parallel with each other having a predetermined gap g;
(B) A plurality of fiber reinforced plastic wires 2 (and ear yarns fe) arranged in parallel to each other are woven with weft yarns 3 at predetermined intervals along the longitudinal direction of the fiber reinforced plastic wires 2 to form a sheet-like shape. Weaving the fabric,
It is produced by.

According to the present invention, the fiber reinforced plastic structure 100 configured as described above is
(1) Pull-out molding method (2) Hand lay-up method (3) RTM method (4) Hot pressing method is used.

  Next, the method for molding the fiber-reinforced plastic structure having the above-described configuration according to the present invention will be further described.

(1) Pull-out molding method Conventionally, it has been proposed to use in combination with carbon fiber in order to increase flexural elasticity. However, since it has a structure in which the fiber is forcibly drawn into the mold at the molding stage, carbon fiber yarns are used. Cutting, misalignment, yarn fluctuation, etc. occur, and the effect of inserting carbon fiber cannot be expected and is not used.

  On the other hand, in this invention, it can form simultaneously using the fiber-reinforced plastic strand sheet 1 using carbon fiber. According to this, there is no worry about thread breakage, and there is little misalignment, and there is no yarn fluctuation at all. Moreover, even if it is arranged on the outer surface layer 102 of a structure that easily exhibits mechanical properties, it has an optimum design without worrying about thread breakage due to frictional force with the mold, and mechanical properties such as bending elastic modulus that can resist metals. It can be molded with physical properties.

  FIG. 6A shows an example of the pultrusion apparatus 20. According to the present embodiment, the pultrusion molding apparatus 20 includes a reinforcing fiber supply creel 21, a resin tank 22 containing a resin, a heating mold 23, and a take-up device 24.

  According to the present embodiment, the reinforcing fiber sheet 103 and the fiber reinforced plastic strand sheet 1 are supplied to the resin tank 22 from the reinforcing fiber sheet creels 21b and 21c and the strand sheet creels 21a and 21d, respectively.

  In the present embodiment, one strand sheet creel 21a, 21d is disposed outside the plurality of (two in the present embodiment) reinforcing fiber sheet creels 21b, 21c. That is, in the present embodiment, a laminated body is configured in which one layer (one sheet) of fiber reinforced plastic strand sheet 1 is laminated on each side of two layers (two sheets) of laminated reinforcing fiber sheets 103. The

  The laminated body is introduced into the resin tank 22 by the introduction rollers 25a to 25d, impregnated with the resin by the impregnation rollers 26 and 27 disposed in the resin tank 22, and guided by the outlet rollers 28 and 29 to be heated. It is sent to the mold 23.

  The laminate S impregnated with the resin is shaped into a predetermined shape by the heating mold 23 and is heated and cured at a predetermined temperature. A molded product (that is, a fiber reinforced plastic structure) 100 molded into a predetermined shape by the heating mold 23 is continuously drawn from the heating mold 23 by the take-out device 24.

  Thus, according to the present embodiment, the fiber reinforced plastic structure 100 having a predetermined cross-sectional shape is continuously produced by the pultrusion method.

  According to the present embodiment, as shown in FIG. 6A, the fiber reinforced plastic structure 100 is composed of a substrate 101 formed of a plurality of reinforcing fiber sheets 103 (two in this embodiment). An outer surface layer 102 formed of a single fiber-reinforced plastic strand sheet 1 is laminated on each side surface.

  As shown in FIG. 6B, the cross-sectional shape of the fiber reinforced plastic structure 100 may be a rectangular plate shape (A), or a circular or rectangular pipe shape (B) or (C). It is also possible to use various shapes such as L-shaped (or U-shaped (not shown) or other deformed material (d)).

(2) Hand Lay Up Method Next, a method for forming the fiber reinforced plastic structure 100 by the hand lay up method will be described.

  FIG. 7 shows an example of a hand layup molding method. According to this embodiment, a resin (adhesive) 104 is applied on a mold 30 having a desired shape and size as required, and then a desired number of fiber-reinforced plastic strand sheets 1 are disposed. The Next, the reinforcing fiber sheet 103 is disposed on the fiber reinforced plastic strand sheet 1, and further, the resin 104 is applied onto the reinforcing fiber sheet 103 using the application roller 31, and the reinforcing fiber sheet 103 is impregnated with the resin. Let

  If necessary, the above operation is repeated to laminate a desired number of reinforcing fiber sheets 103 while impregnating the reinforcing fiber sheet 103 with the resin 104. A laminate composed of a plurality of reinforcing fiber sheets 103 constitutes the base 101.

  Further, the adhesive 104 is further applied on the laminate formed by laminating the fiber reinforced sheet 103 by hand layup as described above, and the fiber reinforced plastic strand sheet 1 is pressed and disposed thereon. Further, if necessary, the fiber reinforced plastic strand sheet 1 is laminated by applying an adhesive 104 on the fiber reinforced plastic strand sheet 1 (impregnated with resin).

  If necessary, the above operation is repeated, that is, the resin is applied to the fiber reinforced plastic strand sheet 1 and laminated on the desired number of fiber reinforced sheets 103 (substrate 101). By curing the adhesive 104, the base 101 and the outer surface layer 102, that is, the fiber reinforced plastic structure 100, which are made of fiber reinforced plastic, are formed.

  For example, when the flat fiber-reinforced plastic structure 100 is formed, when a plurality of fiber-reinforced plastic strand sheets 1 are used, the direction of the wire 2 of the stacked fiber-reinforced plastic strand sheets 1 is used. Can be molded.

  In addition, as understood above, the fiber reinforced plastic strand sheet 1 can be formed in a structure having a uniform cross section in the length direction of the strand sheet 1 in a free shape. However, as shown in FIG. 8A, it is extremely difficult to produce a structure that is curved in a direction orthogonal to the length of the fiber-reinforced plastic strand sheet 1.

  Therefore, in such a case, as shown in FIG. 8B, two orthogonal fiber-reinforced plastic strand sheets 1a and 1b and a corner portion connecting the two fiber-reinforced plastic strand sheets 1a and 1b are formed. And a single fiber-reinforced plastic strand sheet 1c. The fiber reinforced plastic wire 2 of the fiber reinforced plastic strand sheet 1c is disposed orthogonally to the fiber reinforced plastic wire 2 of the both fiber reinforced plastic strand sheets 1a and 1b, and thus can be in a free shape. The wrap length La between the fiber reinforced plastic strand sheets 1a and 1b and the fiber reinforced plastic strand sheet 1c varies depending on the resin used. For example, when an epoxy resin is used, the minimum length La is 15 mm. It is said to be about.

  The strand sheet 1c made of fiber reinforced plastic can be a molded product impregnated with a resin and cured into a predetermined shape.

  Conventionally, when a fiber reinforced plastic structure, that is, a base 101 is produced by a hand lay-up molding method, a reinforcing fiber sheet 103 not impregnated with resin is used, and these sheets 103 are impregnated with resin 104. If the layers are stacked while being laid, there is a problem that yarn fluctuations inevitably occur and it is difficult to fully demonstrate the performance of the yarn.

  According to the present embodiment, since the outer surface layer 102 is produced using the fiber reinforced plastic strand sheet 1 in which the resin has already been cured, in the outer surface layer 102, at the time of sheet lamination or resin impregnation (adhesion), There is no decrease in mechanical properties due to yarn fluctuations, and the expected mechanical properties can be exhibited as planned.

  However, the fiber reinforced plastic strand sheet 1 uses the fiber reinforced plastic wire 2 and has been pre-treated. Therefore, if it is used in a large amount, the cost increases. Therefore, the fiber-reinforced plastic strand sheet 1 is optimally used for the surface layer portion (outer surface layer) of the structure, which is effective for exerting the mechanical properties of the structure.

  For example, in the case of producing a panel using an inexpensive glass fiber as a vehicle structure as a structure to be molded, the thickness of the panel must be increased in order to secure a flexural modulus. It did not meet the requirements for weight reduction and was difficult to adopt.

  On the other hand, as described in the present embodiment, when the fiber-reinforced plastic strand sheet 1 using carbon fiber having a high elastic modulus is used for the outer surface layer 102 of the panel, the thickness of the panel can be reduced and the weight can be reduced. Can be achieved. And since it is cheap, the structure of the present invention can be adopted.

  In addition, when the structure to be molded is a blade of a windmill, the size of the blade has come to exceed 30 m because of the need for a larger windmill. For this reason, conventionally, the blades manufactured using glass fibers are being converted into carbon fibers having more excellent mechanical properties.

  At this time, the problem is that the cost of the material is greatly increased from the increase in the material unit price. In addition, if a large structure is made of a woven fabric not impregnated with resin, there is a problem that yarn fluctuations inevitably increase and the goodness of carbon fibers cannot be exhibited.

  Therefore, as described in the present embodiment, by using the fiber-reinforced plastic strand sheet 1 that can definitely exhibit performance by using the fiber-reinforced plastic wire 2 already impregnated with resin, the above-mentioned The problem is solved.

  In other words, in the case of wind turbine blades, the fiber-reinforced plastic strand sheet 1 is disposed at a location where the elastic modulus is required in terms of strength, and the optimal cost minimum is ensured while ensuring good blades using conventional glass fibers. You can design.

  Even in the case of a member for architectural use, since weight reduction is required, the mechanical properties are ensured by using the fiber reinforced plastic strand sheet 1 for the outer surface layer 102 of the member as in the case of the vehicle member. However, it is possible to reduce the weight and suppress the cost increase.

(3) RTM method Next, the molding method of the fiber reinforced plastic structure 100 by the RTM method will be described.

  FIG. 9 shows an example of the RTM molding method. According to the present embodiment, after a sealant 41 is applied on a mold (molding die) 40 having a desired shape and dimensions, a predetermined number of fiber-reinforced plastic strand sheets 1 and a predetermined number of sheets are formed thereon. A laminated body composed of the reinforcing fiber sheet 103 and a predetermined number of fiber reinforced plastic strand sheets 1 is formed, and the laminated body is covered with a bag film 42.

  Next, the resin 104 is supplied from the resin pot 43 into the bag film 42 and, at the same time, the bag film 42 is evacuated by the vacuum pump 44.

  Thereby, the resin is impregnated into the laminate composed of the fiber reinforced plastic strand sheet 1, the predetermined number of the reinforcing fiber sheets 103, and the fiber reinforced plastic strand sheet 1.

  Next, although not shown, the mold is placed in a heating furnace to cure the resin in the laminate.

  Thereby, the fiber reinforced plastic structure 100 shaped into a predetermined shape is molded.

  The disadvantages of the RTM method (vacuum bug molding method) described above are that, like the hand lay-up molding method, the fluctuation of the reinforcing fibers occurs when the resin flows, and the resin having a large thickness has a problem. Is difficult to penetrate.

  On the other hand, in this embodiment, by arranging the fiber reinforced plastic strand sheet 1, the gap (g) between the strands, that is, the fiber reinforced plastic wires 2 and 2, becomes a passage for the resin, and is thicker. Advantages that can be stably formed, and strand sheet 1 made of fiber reinforced plastic does not have to worry about yarn fluctuation, so that the physical properties of reinforced fibers can be maximized, and costs can be reduced and lighter weight can be produced. There is.

(4) Hot pressing method Next, the molding method of the fiber reinforced plastic structure 100 by the hot pressing method using the SMC material will be described.

  FIG. 10 shows an example of the hot press method.

  The hot press apparatus 50 includes a fixed mold 51 and a movable mold 52 that are heating molds. According to the present embodiment, a predetermined number of fiber-reinforced plastic strand sheets 1, a predetermined number of reinforcing fiber sheets 103, and a predetermined number of fiber-reinforced plastics are formed on a fixed mold 51 having a desired shape and size. The strand sheet 1 is laminated. In this embodiment, the reinforcing fiber sheet 103 is made of an SMC material impregnated with a resin in advance. The fiber reinforced plastic strand sheet 1 is coated with the same resin as that used in the SMC material when it is set in a mold.

  Next, the movable mold 52 is moved toward the fixed mold 51, the movable mold 52 is pressed against the fixed mold 51, and both the heating molds are heated. As a result, the resin in the laminate composed of the fiber-reinforced plastic strand sheet 1, the reinforcing fiber sheet 103, and the fiber-reinforced plastic strand sheet 1 is heat-cured.

  Thereby, the fiber reinforced plastic structure 100 shaped into a predetermined shape is molded.

  According to the present embodiment, as described above, the fiber reinforced plastic strand sheet 1 uses the fiber reinforced plastic wire 2 already impregnated with the resin. Therefore, there is a problem even if the resin of the SMC material is different. Rather, it can be used in combination with an SMC material previously impregnated with resin.

Example 2
The strand sheet 1 made of fiber reinforced plastic used in the structure 100 of the present invention has a sheet structure in which a thin rod (fiber reinforced plastic wire) 2 continuous in the longitudinal direction is stopped with a weft 3 in a slender shape. Although it cannot be bent in the longitudinal direction, it can be freely bent in the direction perpendicular thereto.

  By utilizing this, as shown in FIG. 11, a unidirectional reinforcing fiber sheet 10 in which reinforcing fibers f are aligned in one direction is added to a strand sheet 1 made of fiber reinforced plastic. By using a material that has been bonded in advance so that the direction of the thread f is perpendicular to the longitudinal direction, not only the longitudinal direction of the strand 2 but also a material that exhibits mechanical properties in the direction perpendicular thereto can be formed. Instead of the unidirectional reinforcing fiber sheet 10, a cloth reinforcing fiber sheet may be used.

  Even if the unidirectional reinforcing fiber sheet 10 not impregnated with resin or the reinforcing fiber sheet 10 of cloth is bonded and fixed in advance to the fiber reinforced plastic strand sheet 1 that does not cause yarn fluctuation, Fluctuation does not occur, and it is possible to manufacture a structural material that exhibits mechanical properties close to full even in a direction perpendicular to the fiber-reinforced plastic strand sheet 1.

  Similarly, although not shown, if the reinforcing fiber f is woven at ± 45 °, that is, if the biased cloth reinforcing fiber sheet 10 is bonded to the strand sheet 1 made of fiber reinforced plastic, the fiber reinforced plastic is used. A structure capable of exhibiting mechanical properties at ± 45 ° with respect to the longitudinal direction of the strand sheet 1 can be obtained.

  The reinforcing fiber sheet 10 is used as the outer surface layer 105 described with reference to FIG. The reinforcing fiber sheet 10 can be the same as the reinforcing fiber sheet 103 used for the base 101 described above. That is, the reinforcing fiber sheet 10 is impregnated with a resin in advance in a cloth fabric, a unidirectional fabric, a strand mat, or a short cut fiber formed into a sheet shape using glass fibers, aramid fibers, or carbon fibers. Thus, a sheet-like SMC material formed into a sheet shape can be obtained.

  Note that, as in this example, the unidirectional or cross reinforcing fiber sheet provided as the outer surface layer 105 of the outer surface layer 102 that is the fiber reinforced plastic strand sheet 1 usually has a thickness of 0.2. It is set to about -1.0 mm, and it is set as a 1-3 layer reinforcing fiber sheet. The outer surface layer 105 is provided for reasons such as bending strength in a direction that cannot be covered with the fiber-reinforced plastic strand sheet 1, reinforcement of the flexural modulus, or improvement of surface properties such as surface smoothness and aesthetics.

(Experimental example)
Next, the following experiment was performed in order to verify the effect of reinforcement by providing the outer surface layer 102 constituted by the fiber reinforced plastic strand sheet 1 in the structure according to the present invention.

(Fiber-reinforced plastic strand sheet 1)
The fiber-reinforced plastic wire 2 in the fiber-reinforced plastic strand sheet 1 used carbon fiber (trade name: TR50-15K) manufactured by Mitsubishi Rayon Co., Ltd. as the reinforcing fiber f. This carbon fiber, that is, a PAN-based carbon fiber strand having an average diameter of 7 μm and a converged number of 15000, was impregnated with a thermosetting epoxy resin as the matrix resin R and cured. The resin impregnation amount (Vm) was 50%, and the fiber-reinforced plastic wire 2 after curing had a circular cross section with a diameter (d) of 1.19 mm (about 1.2 mm).

The mechanical properties of the fiber reinforced plastic wire 2 are as follows:
Tensile strength: 2350 Mpa
Tensile modulus: 120 Gpa
Compressive strength: 600 MPa
Bending strength: 1300Mpa
Flexural modulus: 115 Gpa
Met.

As shown in FIG. 5, the fiber reinforced plastic wire 2 obtained in this way was aligned in one direction and arranged in a saddle shape, and then polyester fibers were woven as weft yarns 3 and held in a sheet shape. It was one in which 600 wires 2 (weight per unit: carbon fiber 600 g / m ² ) were woven into a width of 100 cm. Polyester fibers were used as the ear threads fe.

(Execution test material of the present invention)
As shown in FIG. 12 (a), 21 layers of glass mats as the base 101 are laminated on the innermost layer by hand lay-up, and each of the fiber-reinforced plastic strand sheets 1 as the outer surface layer 102 on each outer side. Further, two glass scrims 105 were laminated as outermost layers (surface layers) on the outside by hand layup. The reason why the glass scrim 105 is disposed in the outermost layer is to prevent electric corrosion and improve surface wear.

The glass mat had a basis weight of 300 g / m ² and the glass scrim 105 had a basis weight of 25 g / m ² . The resin used was an epoxy resin (“E5P” trade name, manufactured by Nippon Steel Composite Co., Ltd.).

  The dimensions of the test material used were a plate thickness (h) of 15.4 mm, a width (b) of 100 mm, and a length (length in the direction perpendicular to the paper surface of FIG. 12A) of 500 mm. The thickness hs of the outer surface layer 102 on which the fiber-reinforced plastic strand sheet 1 is arranged (that is, the diameter d of the fiber-reinforced plastic wire 2) is 1.2 mm, and the thickness (hm) of the glass mat portion that is the base 101 is 12.6 mm. The thickness (hg) of the outermost glass scrim 105 was 0.2 mm.

(Comparative test material 1)
As shown in FIG. 12 (b), 26 layers of glass mats were laminated as the substrate 101 by hand layup, and glass scrims 105 were laminated on each outer side by two layers as outermost layers.

The glass mat had a basis weight of 300 g / m ² and the glass scrim 105 had a basis weight of 25 g / m ² . The resin used was an epoxy resin (“E5P” trade name, manufactured by Nippon Steel Composite Co., Ltd.).

  The dimensions of the comparative test material 1 were a plate thickness (h) of 16.1 mm, a width (b) of 100 mm, and a length (length in the direction perpendicular to the paper surface of FIG. 12B) of 500 mm. The thickness (hm) of the glass mat portion which is the substrate 101 was 15.7 mm. The thickness (hg) of the outermost glass scrim 105 was 0.2 mm.

(Comparative test material 2)
As shown in FIG. 12 (c), 27 layers of glass mats are laminated on the innermost layer as the base 101 by hand lay-up, and one unidirectional carbon fiber sheet 106 is disposed on both outer sides thereof. Two glass scrims 105 were laminated as outermost layers on the outside by layup.

The glass mat had a basis weight of 300 g / m ² and the glass scrim 105 had a basis weight of 25 g / m ² . The resin used was an epoxy resin (“E5P” trade name, manufactured by Nippon Steel Composite Co., Ltd.).

The unidirectional carbon fiber sheet 106 is a toe sheet (trade name: FTS) manufactured by Nippon Steel Composite Co., Ltd. using the carbon fiber (trade name: TR50-15K) manufactured by Mitsubishi Rayon Co., Ltd. as the reinforcing fiber f. -C1-60) (weight per unit of carbon fiber: 600 g / m ² ).

  The dimensions of the comparative test material 2 were a plate thickness (h) of 15.4 mm, a width (b) of 100 mm, and a length (length in the direction perpendicular to the paper surface of FIG. 12C) of 500 mm. The thickness hc of the unidirectional carbon fiber sheet 106 was 1.2 mm, and the thickness (hm) of the glass mat portion serving as the base 101 was 12.6 mm. The thickness (hg) of the outermost glass scrim 105 was 0.2 mm.

(Bending test conditions and test results)
The bending test was performed with a universal testing machine, and the distance between supporting points was 450 mm and the load span was 150 mm.

The bending test results were as follows.
(1) Test material: bending strength 336 Mpa, bending elastic modulus 29.0 Gpa
(2) Comparative test material 1: bending strength 118 Mpa, flexural modulus 8.8 Gpa
(3) Comparative test material 2: bending strength 211 Mpa, flexural modulus 25.0 Gpa
As a result of the above test, it was found that in the structure according to the present invention, the reinforcing effect due to the provision of the outer surface layer 102 composed of the fiber reinforced plastic strand sheet 1 was remarkable.

(Consideration of test results and theoretical values)
The present inventors considered the correspondence between the above experimental results and the theoretical bending elastic modulus and bending strength.

  First, the theoretical bending elastic modulus of the test material for which the present invention is implemented is calculated as follows.

  In the test material shown in FIG. 12A, the glass mat portion constituting the substrate 101 has a flexural modulus of 8.8 Gpa and a flexural strength of 118 Mpa.

  Moreover, the strand (fiber reinforced plastic wire 2) which comprises the fiber reinforced plastic strand sheet 1 has a bending elastic modulus of 115 Gpa and a bending strength of 1300 Mpa.

Here, in this example, as described above, since the fiber-reinforced plastic strand sheet 1 has a basis weight of 600 g / m ² , the calculation is performed assuming that 600 strands 2 exist in a 1 m width.
The area of the fiber reinforced plastic wire is 1.13 mm ² / line × 600 lines = 678 mm ²
The plate thickness area is 1.2 mm x 1000 mm = 1200 mm ²
Therefore,
Vf of fiber reinforced plastic wire is 678 ÷ 1200 = 56.5%
The bending elastic modulus of the fiber-reinforced plastic strand sheet (outer surface portion) 102 is
115 Gpa × 0.565 = 65.0 Gpa + α1
The bending strength of the fiber reinforced plastic strand sheet (outer surface portion) 102 is:
1300Mpa × 0.565 = 734.5Mpa + α2
Here, α1 and α2 are amounts that take into account the bending elastic modulus and bending strength of the resin (adhesive) 104.

  Epoxy resin has a flexural modulus of 2.9 Gpa and a flexural strength of about 65 Mpa, which is 10% or less, and is ignored here.

  The theoretical bending elastic modulus and bending strength of the outer surface layer 102 formed of the fiber reinforced plastic strand sheet 1 will be examined.

Second moment of the outer surface layer 102 partially composed of fiber-reinforced plastic strands sheet ^{1 (I = bh 3/12} : b is the width, h is thickness),
I1 = b / 12 × (15.4 ³ −13.0 ³ ) = b / 12 × 1455.3
The cross-sectional secondary moment of the base 101, that is, the core is
I2 = b / 12 × 13.0 ³ = b / 12 × 2197
The cross-sectional secondary moment of the full thickness is
I3 = b / 12 × 15.4 ³ = b / 12 × 3653.3
Here, when the average bending elastic modulus of the fiber-reinforced plastic strand sheet 1 is obtained,
I1 * E1 + I2 * E2 = I3 * E3
That is,
1455.3 × 65.0 + 2187 × 8.8 = 3653.3 × E3
E3 = 31.2 Gpa

  As described above, the test value of the test material according to the bending test result has a bending elastic modulus of 29.0 Gpa.

  That is, according to the present invention, it was found that the reinforcing effect of the outer surface layer 101 can be assumed by obtaining a theoretical calculation value when adding the outer surface layer 101. That is, the outer surface layer 101 can be designed according to the required mechanical properties, which is extremely effective.

In other words, according to the present invention, since it has the required mechanical strength and does not cause fiber fluctuations during molding, it is molded using a fiber reinforced plastic strand sheet that has been resin-cured in advance.
(1) Pull-out molding method (2) Hand lay-up method (3) RTM method (4) In hot molding method, even if the same inexpensive resin as before is used, the structure as designed in advance It is possible to provide a fiber-reinforced plastic structure having improved mechanical properties such as tensile strength, tensile elastic modulus, compressive strength, compressive elastic modulus, bending strength, and bending elastic modulus.

1 Strand sheet made of fiber reinforced plastic 2 Fiber reinforced plastic wire material 3 Wire material fixing material (weft)
DESCRIPTION OF SYMBOLS 10 Fiber reinforced sheet 100 Structure 101 Structure (base | substrate)
102 Surface (outer surface layer)
103 Glass mat 104 Adhesive (impregnating resin)
105 Glass scrim (outer surface layer)
106 Unidirectional carbon fiber sheet

Claims (13)

In a molding method in which a plurality of reinforcing fiber sheets are laminated and a fiber reinforced plastic structure is molded by a pultrusion method, a hand layup method, a resin transfer molding method, or a hot press method,
At the time of forming the structure, at least one fiber-reinforced plastic strand sheet having a plurality of fiber-reinforced plastic wires aligned in the longitudinal direction on the outer surface of a base formed by laminating a plurality of the reinforcing fiber sheets. A method for molding a fiber-reinforced plastic structure, wherein a sheet is placed and simultaneously molded using a resin molded by the molding method.   The reinforcing fiber of the fiber-reinforced plastic wire contains carbon fiber having a tensile strength of 3000 MPa or more and a tensile elastic modulus of 230 GPa or more in a volume fraction of 50% or more. The method for molding a fiber-reinforced plastic structure according to claim 1, wherein: Reinforcing fibers of the fiber reinforced plastic wire include carbon fibers other than carbon fibers having a tensile strength of 3000 MPa or more and a tensile modulus of 230 GPa or more; carbon fibers having a tensile strength of less than 3000 MPa and a tensile modulus of less than 230 GPa; boron fibers, titanium fibers, or steel fibers features alone or that mixed plural kinds are used in the hybrid; and metal fibers are; aramid, PBO (polyparaphenylene benzobisoxazole), polyamide, organic fibers are polyarylate or polyester The method for molding a fiber-reinforced plastic structure according to claim 2. The matrix resin of the fiber reinforced plastic wire is cold-setting or thermosetting epoxy resins, vinyl ester resin, MMA resin, thermosetting resin is an unsaturated polyester resin or phenol resin, or a nylon or vinylon The method for molding a fiber-reinforced plastic structure according to claim 2 or 3, wherein the thermoplastic resin is used.   The fiber-reinforced plastic wire has a circular cross-sectional shape with a diameter of 0.5 to 3 mm, or a rectangular cross-sectional shape with a width of 1 to 20 mm and a thickness of 0.1 to 5 mm. The molding method of the fiber reinforced plastic structure of any one of Claims 1-4.   The strand sheet made of fiber reinforced plastic has a plurality of continuous fiber reinforced plastic wires as warp yarns, arranged in parallel with a predetermined gap between each other, and the plurality of fiber reinforced plastic wires arranged in parallel to each other. The fiber-reinforced plastic structure according to any one of claims 1 to 4, wherein the fiber-reinforced plastic structure is a sheet-like woven fabric in which wefts are woven at predetermined intervals along the longitudinal direction of the fiber-reinforced plastic wire. Molding method. The weft in the fiber reinforced plastic strand sheet is a yarn made of carbon fiber, glass fiber, cotton, or aramid fiber, polyamide fiber, polyvinyl alcohol fiber, polyethylene alcohol fiber or polyethylene terephthalate fiber, and these are the fiber reinforced plastic. The method for molding a fiber reinforced plastic structure according to claim 6 , wherein the fiber reinforced plastic structure is woven at intervals of 1 to 250 mm along the longitudinal direction of the wire.   The fiber-reinforced plastic wires in the fiber-reinforced plastic strand sheet are separated from each other at any interval between 0.1 to 3 mm. Molding method for fiber reinforced plastic structures. The fiber-reinforced plastic strands sheet in which a plurality of sheets stacked, any of the preceding claims, characterized in that the alignment direction of the fiber reinforced plastic wire of the fiber-reinforced plastic strands sheet is a product layer differently 1 A method for molding a fiber-reinforced plastic structure according to Item.   The method for molding a fiber-reinforced plastic structure according to any one of claims 1 to 9, wherein a reinforcing fiber sheet is further disposed as an outer surface layer of the fiber-reinforced plastic strand sheet.   The reinforcing fiber sheet is obtained by impregnating a resin in advance with a cloth, a unidirectional fabric, a strand mat, or a short cut fiber formed into a sheet shape using glass fiber, aramid fiber, or carbon fiber. The method for molding a fiber-reinforced plastic structure according to any one of claims 1 to 9, which is a sheet-like SMC material molded into a sheet. The resin to be molded by the molding method, cold setting or thermosetting epoxy resin, unsaturated polyester resin, vinyl ester resin, thermosetting resin are MMA resin or phenol resin, or nylon or vinylon The method for molding a fiber-reinforced plastic structure according to any one of claims 1 to 10, wherein the thermoplastic resin is a thermoplastic resin.   The fiber reinforced plastic structure manufactured by the molding method of the fiber reinforced plastic structure of any one of Claims 1-12.

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