JP2015017228A - Flat fiber reinforced plastic sheet, fiber reinforced plastic sheet and method for producing the same - Google Patents

Abstract

An object of the present invention is to form a flat fiber reinforced plastic plate in which a plurality of flat fiber reinforced plastic wires having no fiber orientation disorder, which are produced by curing a resin-impregnated strand containing a twist, and a flat fiber reinforced plastic plate. A high-strength fiber-reinforced plastic sheet suitable for RTM molding and the like, and a method for producing the same. A twisted resin-impregnated strand f2 containing a large number of reinforcing fibers f is molded and cured to form at least two flat fiber reinforced plastic wires 2 having a flat cross section along the longitudinal direction. The flat fiber reinforced plastic plate 2A having a flat cross-sectional shape formed in close contact so that there is substantially no gap, and the flat fiber reinforced plastic wire 2 has a thickness (t) of 0.2-3. 0 mm and width (w) are 1.0-5.0 mm. [Selection] Figure 1

Description

  The present invention relates to a flat fiber reinforced plastic plate produced by tightly joining a plurality of flat fiber reinforced plastic wires in the longitudinal direction and a method for producing the same, and moreover, a plurality of such flat fiber reinforced plastic plates in the longitudinal direction. The present invention relates to a fiber reinforced plastic sheet that is arranged in one direction along a direction and is made into a sheet and a method for manufacturing the same. The flat fiber reinforced plastic sheet and the fiber reinforced plastic sheet can be widely used in RTM molding or the like as a large FRP (fiber reinforced plastic material) used for, for example, windmill blades, vehicles, ships, etc. It can also be used as a reinforcing material for reinforcing concrete structures, steel structures, and fiber reinforced plastic structures.

  Conventionally, a fiber reinforced plastic sheet produced by using, for example, a reinforced fiber such as carbon fiber is reinforced by adhering to a concrete structure, a steel structure, or a fiber reinforced plastic structure, which is a civil engineering building structure. Used as a material. Fiber reinforced plastic sheets are also widely used in RTM molding and the like as large FRPs (fiber reinforced plastic materials) used for windmill blades, vehicles, ships and the like.

  For example, a carbon fiber reinforced plastic sheet using carbon fibers has been conventionally impregnated with a resin in which a large number of carbon fiber strands (fiber bundles) produced by gathering tens of thousands of filaments are arranged in a plane, and if necessary, gold It is produced by molding into a plate-like member having a predetermined cross-sectional shape with a mold and then curing.

In general, when a molded plate is produced by passing a resin-impregnated carbon fiber strand through a mold or the like, particularly when a molded plate having a large fiber basis weight is produced, the carbon fiber strand is formed in the mold in the process of forming the carbon fiber strand. May move in a direction that intersects the traveling direction of the carbon fiber, and the orientation of the carbon fiber strands (ie, carbon fiber filaments) may be disturbed. In particular, such a problem frequently occurs when a large number of carbon fiber strands are used to produce a fiber reinforced plastic sheet having a high fiber basis weight of, for example, 1000 g / m ² or more.

  Therefore, it has been devised to arrange the comb (comb-shaped guide member) on the strand feeding side to the mold, the carbon fiber strand supply is at a fixed position, and to eliminate the orientation disorder of the carbon fiber strand, In particular, when the amount of carbon fiber strands is large, the actual situation is that some strands meander and move up, down, left and right. When the carbon fiber strands meander, the fiber length varies as viewed microscopically, and it becomes difficult to express desired tensile strength, elastic modulus, and the like.

  Therefore, it is conceivable to twist each carbon fiber strand. By twisting the carbon fiber strand, meandering of the carbon fiber strand (that is, carbon fiber filament) is prevented.

  As described in Patent Document 1, the present patent applicant confirmed that the strength does not decrease by specifying the number of twists applied to the carbon fiber bundle (carbon fiber strand), and applied a predetermined number of twists. A carbon fiber sheet produced by a bundle of carbon fiber filaments was proposed. This carbon fiber sheet is also excellent in resin impregnation properties, but as described above, resin impregnation is then required to produce a fiber-reinforced plastic sheet. In particular, when a fiber-reinforced plastic sheet having a large fiber basis weight is produced, the resin impregnation operation becomes complicated.

  In addition, as described in Patent Document 2, the applicant of this patent application impregnates a carbon fiber strand that is continuously fed while twisting the resin, or twists the carbon fiber strand impregnated with the resin. It was proposed to fabricate a fiber reinforced plastic wire having a circular cross section by impregnating with resin and then applying a predetermined tension. The wire manufacturing method described in Patent Document 2 has many advantages such as enabling a large number of wires to be manufactured at once without using a mold.

Japanese Patent No. 4667069 JP 2008-222846 A

  The present inventors conducted further research and experiments based on the techniques described in Patent Documents 1 and 2 described above. For example, 60K (the number of carbon fiber filaments was 60000) impregnated with twisted resin. It has been found that a plurality of carbon fiber strands of a fiber bundle) can be integrated to form a flat carbon fiber plastic plate, and a carbon fiber reinforced plastic sheet can be produced very efficiently using this carbon fiber plastic plate.

  The present invention is based on such novel findings of the present inventors.

  An object of the present invention is to provide a flat fiber reinforced plastic plate in which a plurality of flat fiber reinforced plastic wires having no fiber orientation disorder and produced by curing a resin-impregnated strand containing a twist are integrated, and such a flat fiber reinforced plastic plate A high-strength fiber reinforced plastic sheet suitable for RTM molding and the like, and a method for producing the same.

Another object of the present invention is to integrate a plurality of flat fiber reinforced plastic wires having a fiber basis weight of 1000 g / m ² or more and having no fiber orientation disorder using strands impregnated with twisted resin, for example, 60K. It is intended to provide a flat fiber reinforced plastic sheet, a high strength fiber reinforced plastic sheet suitable for RTM molding and the like and formed by the flat fiber reinforced plastic sheet, and a method for producing the same.

The above object is achieved by the flat fiber reinforced plastic plate, the fiber reinforced plastic sheet and the manufacturing method thereof according to the present invention. In summary, according to the first aspect of the present invention, at least two or more flat fiber reinforced plastic wires whose cross-sectional shape is flattened by molding and curing a twisted resin-impregnated strand including a plurality of reinforcing fibers. Is a flat fiber reinforced plastic plate having a flat cross-sectional shape formed in close contact with the longitudinal direction so that there is substantially no gap,
The flat fiber reinforced plastic wire has a thickness (t) of 0.2 to 3.0 mm and a width (w) of 1.0 to 5.0 mm. .

  According to one embodiment of the first invention, the resin-impregnated strand is obtained by converging 6000 to 60000 reinforcing fibers and impregnating the resin.

  According to another embodiment of the first invention, the content of the reinforcing fibers in the resin-impregnated strand is 30% to 70% in volume ratio (Vf).

  According to another embodiment of the first invention, the number of twists of the strand is 5 times / m to 30 times / m.

According to another embodiment of the first invention, the reinforcing fiber is an inorganic fiber such as carbon fiber, glass fiber, basalt fiber, or aramid fiber, PBO fiber, polyamide fiber, polyester fiber, polyarylate fiber, etc. Used by mixing one or more organic fibers of
The matrix resin is any one of an epoxy resin, a vinyl ester resin, an MMA resin, an unsaturated polyester resin, or a phenol resin.

  According to another embodiment of the first invention, the flat fiber reinforced plastic plate is composed of 2 to 50 flat fiber reinforced plastic wires.

According to another embodiment of the first aspect of the present invention, the total area of the gaps formed between the flat fiber reinforced plastic wires along the longitudinal direction of the flat fiber reinforced plastic wire is the flat fiber reinforced plastic. It is 0.1 m ² or less per 1 m ^{2 of the} plate.

According to the second aspect of the present invention, there are a plurality of flat fiber reinforced plastic plates having any one of the above-described configurations, each including at least two sheets,
The plurality of flat fiber reinforced plastic plates are aligned in the longitudinal direction and are integrally held by a fixing member to form a sheet, and a predetermined length along the longitudinal direction is provided between the adjacent flat fiber reinforced plastic plates. A fiber-reinforced plastic sheet is provided, characterized in that a gap (g) is provided.

  According to one embodiment of the second aspect of the present invention, the predetermined gap (g) is 0.1 mm to 3.0 mm.

According to the third invention,
(A) At least two or more unimpregnated twisted resin-impregnated strands containing a large number of reinforcing fibers are aligned in one direction along the longitudinal direction and arranged in a plane,
(B) Heating the strands arranged in a plane and pressurizing from both sides of the strands arranged in a plane to form a cross-sectional shape of the strand into a flat shape, and at least two at the same time A flat strand plate having a flat cross-sectional shape formed by closely bonding the flat strands along the longitudinal direction so as to have substantially no gap therebetween is produced, and the resin impregnated in the flat strand plate is cured. A flat fiber reinforced plastic plate,
The manufacturing method of the flat fiber reinforced plastic board characterized by this is provided.

  According to an embodiment of the third aspect of the present invention, the resin-impregnated strand is obtained by converging 6000 to 60000 reinforcing fibers and impregnating the resin.

  According to another embodiment of the third aspect of the present invention, the content of the reinforcing fiber in the resin-impregnated strand is 30% to 70% in volume ratio (Vf).

  According to another embodiment of the third aspect of the present invention, the number of twists of the resin-impregnated strand is 5 times / m to 30 times / m.

  According to another embodiment of the third aspect of the present invention, in the step (b), the resin-impregnated strand is strained at a strength of 500 g / line to 10 kg / line.

  According to another embodiment of the third aspect of the present invention, in the step (b), the strands arranged in a plane are sandwiched and heated by a heated steel belt and arranged in the plane. Further, pressurization is performed from both sides of the strand to form a cross-sectional shape of the strand into a flat shape.

  According to another embodiment of the third aspect of the present invention, in the step (b), a release agent is applied to the steel belt, and the strands arranged in a plane are sandwiched. Preferably, the surface of the flat fiber reinforced plastic plate produced in the step (b) is polished or washed with a solvent to remove the release agent attached to the surface.

  According to a fourth aspect of the present invention, a flat fiber-reinforced plastic sheet produced by any one of the above-described manufacturing methods is arranged in a flat shape and integrally held by a fixing member. A method is provided.

  According to an embodiment of the fourth aspect of the present invention, a predetermined gap (g) is provided along the longitudinal direction between the adjacent flat fiber reinforced plastic plates. Preferably, the predetermined gap (g) is 0.1 mm to 3.0 mm.

The flat fiber reinforced plastic plate and the fiber reinforced plastic sheet of the present invention have, for example, a fiber orientation perturbation of 1000 g / m ² or more and a high strength, and are used for RTM molding or the like as a large FRP, or a civil engineering building structure It can also be used as a reinforcing material to reinforce concrete structures, steel structures, and fiber reinforced plastic structures, and in particular, fiber reinforced plastic sheets have good deformation performance and can be suitably used for RTM molding and the like. it can. Further, according to the production method of the present invention, the fiber basis weight is large using a strand having a large diameter of 50K, for example, thickness (t) 1.0 mm to ² mm (fiber basis weight 900 to 1800 g / m ² ), width ( A fiber-reinforced plastic sheet having a W) of 5 mm to 500 mm can be produced efficiently, that is, the molding yield can be greatly increased.

Fig.1 (a)-(d) is a figure explaining the Example of the flat fiber reinforced plastic board which concerns on this invention. 2 (a) and 2 (b) are diagrams illustrating an embodiment of the fiber-reinforced plastic sheet according to the present invention. FIG. 3 (a) is a perspective view of an embodiment of a resin-impregnated strand used in the production of a flat fiber reinforced plastic plate and a fiber reinforced plastic sheet according to the present invention, and FIG. It is sectional drawing which shows the arrangement | sequence state of the resin impregnation strand before being performed, FIG.3 (c) is sectional drawing which shows the arrangement | sequence state of the flat strand board before and after heating, pressurizing, and hardening, and a flat fiber reinforced plastic board It is. FIG. 3D is a cross-sectional view showing an arrangement state of resin-impregnated strands for explaining the characteristics of the present invention. It is a schematic block diagram of the manufacturing apparatus for demonstrating one Example of the manufacturing method of the resin impregnated strand used for manufacture of the flat fiber reinforced plastic board and fiber reinforced plastic sheet which concerns on this invention. It is a schematic block diagram explaining the action | operation of the unwinding bobbin in the manufacturing apparatus for demonstrating one Example of the manufacturing method of the fiber reinforced plastic sheet which concerns on this invention. It is a schematic block diagram explaining one Example of the manufacturing apparatus which manufactures the flat fiber reinforced plastic board which concerns on this invention. It is a schematic structure perspective view of the shaping | molding hardening apparatus in the manufacturing apparatus shown in FIG. FIG. 8A is a schematic cross-sectional view of the molding and curing apparatus of FIG. 7, FIG. 8A is a cross-sectional view taken along the line AA in FIG. 7, and FIG. 8B is a schematic line B in FIG. It is sectional drawing taken to -B. It is a schematic block diagram explaining one Example of the manufacturing apparatus which manufactures the fiber reinforced plastic sheet which concerns on this invention.

  Hereinafter, a flat fiber reinforced plastic plate and a manufacturing method thereof, and a fiber reinforced plastic sheet and a manufacturing method thereof according to the present invention will be described in detail with reference to the drawings.

Example 1
(Configuration of flat fiber reinforced plastic sheet and fiber reinforced plastic sheet)
1 (a) to (d) show an embodiment of a flat fiber reinforced plastic plate (hereinafter referred to as “flat FRP plate”) 2A according to the present invention, and FIGS. 2 (a) and 2 (b) show the present embodiment. 1 shows an embodiment of a fiber-reinforced plastic sheet (hereinafter referred to as “FRP sheet”) 1 according to the invention.

  First, the flat FRP plate 2A will be described. According to one embodiment, the flat FRP plate 2A has two flat fiber reinforcements that are closely joined together in the longitudinal direction as shown in FIG. 1 (a). It is composed of a plastic wire (hereinafter referred to as “flat FRP wire”) 2.

  If it further demonstrates with reference also to FIG. 3 (a)-(c), each flat FRP wire 2 will be the flat shape made into thickness (t) and the width | variety (w) containing the heat-hardened twist, That is, it is a fiber-reinforced plastic (FRP) wire having a substantially rectangular shape with a thickness (t) smaller than a width (w) (t <w). The flat FRP plate 2A is produced by tightly bonding the side surfaces in the thickness direction of the flat FRP wire 2 along the longitudinal direction of the wire.

  As shown in FIGS. 3A to 3C, the flat FRP wire 2 has a strand (fiber bundle) in which 6000 to 60000 reinforcing fibers f are converged at 5 times / m to 30 times / m. The twisted material is impregnated with a matrix resin R to form a resin-impregnated strand f2, and the resin-impregnated strand f2 can be formed and cured so as to have a flat cross-sectional shape. The content of the reinforcing fiber f in the strand f2 is 30% to 70% in volume ratio (Vf).

  As the reinforcing fiber, carbon fiber can be most preferably used, but is not limited to this, and inorganic fiber such as carbon fiber, glass fiber, basalt fiber, or aramid fiber, PBO fiber, polyamide fiber, polyester Organic fibers such as fibers and polyarylate fibers are used, and any one or more of them can be mixed and used.

  The matrix resin is an epoxy resin, a vinyl ester resin, an MMA resin, an unsaturated polyester resin, or a phenol resin.

  With the above configuration, the flat FRP wire 2 has a rectangular shape with a thickness (t) of 0.2 mm to 3.0 mm and a width (w) of 1.0 mm to 5.0 mm. If the shape is out of this range, there is a problem that high weight per unit area is impossible or the produced flat FRP plate 2A is difficult to bend.

  In the embodiment shown in FIG. 1 (a), the flat FRP plate 2A has been described as being configured by arranging two flat FRP wires 2 in a planar shape and closely bonding them together in the longitudinal direction. However, the present invention is not limited to this, and may be two or more, for example, three or four as shown in FIGS. Further, as shown in FIG. 1 (d), a plurality of flat FRP wires 2 such as 5 or more (up to about 50) can be arranged in a plane.

  In order to minimize warpage, twisting, etc. in the longitudinal direction, the flat FRP plate 2A has two FRP wires 2 and 2 as shown in FIG. The FRP wires 2 and 2 are S-twisted and Z-twisted. Also, as shown in FIG. 1B, when the FRP wires 2 and 2 are composed of three FRP wires 2, 2, and 2, the three FRP wires 2, 2 and 2 are S twist, Z twist, Z twist, or S twist, S twist, Z twist, respectively, and, as shown in FIG. 1 (c), four FRP wires 2, 2, 2 2, the four FRP wires 2, 2, 2, and 2 are preferably S twist, S twist, Z twist, and Z twist, respectively.

  In addition, although the flat FRP board 2A shown to Fig.1 (a)-(c) has substantially no space | gap between the flat FRP wire rods 2 and 2, only flat FRP board 2A, There is no problem in terms of performance even if the gap is completely eliminated, that is, a so-called complete thin plate shape. For example, when the flat FRP plate 2A is resin-bonded to a concrete structure surface or the like as a reinforcing material, for example, referring to FIG. 1 (d), the gap S (S1, S1, S1, S3,... Sn-1, Sn) makes it easy for air existing between the concrete structure surface and the flat FRP plate 2A to escape through the gap S, and flat FRP. Since the resin enters the gap S of the plate 2A, there is an advantage that the adhesion with the resin is improved.

However, considering the problems of strength and appearance, in FIG. 1D, the total area St (S1, S2, S3,...) Of the gap S per 1 m ^{2 of the} integrated flat FRP plate 2A. -Sn-1, Sn) is preferably 0.1 m ² or less. In this specification, “substantially no gap is formed” means a state where the total gap area St per 1 m ² is 0.1 m ² or less. The clearance total area St per 1 m ² is more than 0.1 m ^2, partially flat FRP wire 2 together is separated, is impaired integrity of the FRP plate. Moreover, the thickness increases as the basis weight, and Vf decreases.

  Next, the FRP sheet 1 will be described. As shown in FIG. 2A, the FRP sheet 1 according to the present invention includes a plurality of heat-cured flat FRP plates 2A (2A1, 2A2, 2A3,..., 2An-1, 2An). A plurality of gaps g are provided, arranged in a plane, and connected together by a fixing member 3 to be integrated into a width (W) and a length (L).

  As the fixing member 3, as shown in FIG. 2A, the fixing member 3 is arranged at a pitch Pa (Pa = 0.1 to 100 mm) in a direction orthogonal to the longitudinal direction of the flat FRP plates 2 </ b> A (2 </ b> A <b> 1 to 2 </ b> An). For example, a fixed fiber material made only of wefts made of a fused resin wire or the like, or arranged at pitches Pa and Pb (Pa, Pb = 0.1 to 100 mm) as shown in FIG. In addition, for example, a mesh-like fixed fiber material formed by a weft yarn 3a and a warp yarn 3b made of a fused resin wire or the like, or a non-woven fabric material (not shown) can be used.

  Therefore, the FRP sheet 1 of the present invention has elasticity along the longitudinal direction of each flat FRP plate 2A (2A1 to 2An). For this reason, for example, the FRP sheet 1 can be deformed, that is, bent at a predetermined radius. Furthermore, it can be deformed very easily along the gap (g) in parallel to the longitudinal direction of the flat FRP plate 2A, and is excellent in deformation performance.

  More detailed configurations of the flat FRP plate 2A, the FRP sheet 1 and the like will become more apparent in the description of the manufacturing method of the flat FRP plate and the FRP sheet 1 described below.

(Manufacturing method and apparatus for flat FRP plate)
A method for manufacturing the flat FRP plate 2A will be described with reference to FIGS.

  4 to 6 show an embodiment of a manufacturing apparatus 100 (100A, 100B) for manufacturing the FRP sheet 1 according to the present invention.

  In this example, the FRP sheet 1 manufacturing apparatus 100 (100A, 100B) includes fiber feeding, resin impregnation, winding section 100A (FIG. 4), oblate shape (heating / pressing / curing), cooling, And the take-up section 100B (100B1, 100B2, 100B3) (FIG. 6).

  FIG. 4 shows a fiber feeding, resin impregnation, and winding section 100A in the manufacturing apparatus 100. A strand (fiber bundle) f1 composed of a plurality of reinforcing fibers f moves from the left side to the right side in the drawing, Twist and resin impregnation.

  FIG. 6 shows a flat Heisei shape (heating / pressing / curing), cooling and take-up section 100B of the manufacturing apparatus 100, and the strand f2 subjected to the twisting process and the resin impregnation step moves from the left side to the right side in the drawing. Then, flat shape forming of the strand and resin curing are performed to produce the flat FRP plate 2A.

  More specifically, in the fiber feeding, resin impregnation and winding section 100A shown in FIG. 4, a plurality (usually 3 to 18) of windings for supplying two fibers are used in this embodiment to simplify the drawing. A take-out bobbin (cylindrical bobbin) 11 (11a, 11b) is prepared, and a strand f1 in which a predetermined number of reinforcing fibers f not impregnated with resin are converged is wound around each bobbin 11.

  The strands f1 wound around each bobbin 11 are continuously fed to the resin impregnation step in which the resin impregnation tank 17 is disposed. At the same time, the strand f1 is twisted (fiber bundle supply, twisting process).

  That is, the strand f1 fed to the resin impregnation step is impregnated with the resin in the resin impregnation tank 17, and the strand f2 impregnated with the resin is applied to the winding bobbin 22 (22a, 22b) in a twisted state. It is wound up (resin impregnation and twisting process).

  In the flat Heisei shape (heating / pressing / curing), cooling and take-up section 100B shown in FIG. 6, a plurality of (usually 50 to 300) strands f2 impregnated with resin and twisted are implemented. In the example, the heating / heating unit 100B1 and the cooling unit 100B2 are unwound from the bobbins 22 (22a, 22b), which are two corresponding to make the drawing easier to understand. It is introduced into a pressure / curing / cooling device (hereinafter referred to as “molding / curing device”) 40. The resin-impregnated strand f2 is heated / pressurized to form a round-shaped strand f2 into a flat shape, and subsequently cured and cooled to become a flat FRP wire 2. At the same time, the wire rods 2 and 2 are tightly joined together to produce the flat FRP plate 2A.

  Next, the above steps will be described in more detail.

Fiber bundle supply and twisting process In this example, as understood with reference to FIGS. 4 and 5, in the fiber feeding, resin impregnation and winding section 100A, the bobbin 11 (11a, 11b) is wound. The rotary shaft 12 (12a, 12b) provided in the unwinding device 51 is attached to the rotary shaft 12 (12a, 12b) of the unwinding device 51, and the rotary shaft 12 (13a, 13b) of the unwinding device is rotatably attached.

  Each bobbin 11 (11a, 11b) is rotated around the rotation shaft 12 (12a, 12b) of each bobbin 11 (11a, 11b) by the drive motor M and the gear transmission mechanism G, and the bobbin 11 (11a, 11b) is rotated. The strand f1 wound around () is unwound. At the same time, as described above, each bobbin 11 (11a, 11b) rotates around the rotary shaft 12 (12a, 12b) and rotates along with the rotary shaft 12 (12a, 12b). ).

  That is, the bobbin 11 rotates around the rotation shaft 12 and simultaneously rotates around the rotation main shaft 13 to unwind the strand f1.

  The strand f1 unwound from the bobbin 11 is guided by the guide holes 15 (15a, 15b) formed in the guide 14, and is introduced into the resin impregnation tank 17 by the inlet guide roll 16.

  With the above configuration, the strand f1 supplied to the impregnation step provided with the resin impregnation tank 17 is supplied with a twist.

  By adjusting the number of rotations of the bobbin 11 around the rotation main shaft 13 and the unwinding speed of the strand f1, the number of twists per 1 m can be controlled.

According to the present embodiment, as will be described in detail later, for example, a flat FRP plate 2A (further, FRP sheet 1) having a thickness (t) of 1.0 to 2.0 mm (that is, fiber basis weight 900 to 1800 g / m ² ). ), The wire diameter of the resin-impregnated strand f2 that has been twisted before being fed into the flat Heisei (heating / pressing / curing) section 100B1 is the diameter (d) (FIG. 3 (a)). Is preferably 0.4 to 1.5 mm. Therefore, the strand f1 supplied to the impregnation step converges 6000 to 60000 (60K) carbon fibers (filaments) f having a wire diameter of 6 to 10 μm, for example, when the reinforcing fibers are carbon fibers. The carbon fiber strand (carbon fiber bundle) f1 is used.

  More specifically, the strand f2 manufactured by the manufacturing method of this embodiment (that is, the FRP wire 2 in the flat FRP plate 2A) is twisted 5 to 30 times per meter (5 times / m to 30 times / m). ) Is put in one of the ranges. In particular, in a large-diameter strand f2 of about 50K to 60K, if it is less than 5 times / m, it is difficult to ensure a stable circular shape (round shape) even if a tension is applied before the resin is cured, and the twist is 30 times. When it exceeds / m, it becomes difficult to form a flat shape, and it is not preferable to exceed 30 times / m. In particular, the twist is optimally in the range of 10 times / m to 25 times / m.

-Resin impregnation step The resin impregnation tank 17 contains the matrix resin R, and the inlet guide roller 16 for guiding the strand f1 is arranged at the inlet of the impregnation tank 17 as described above. An impregnation roller 18 is disposed in the impregnation tank 17, and an outlet guide roller pair 19 is disposed at the outlet of the impregnation tank 17.

  The inlet guide roller 16 serves to align the plurality of reinforcing fibers f constituting the strand f1 supplied to the impregnation tank 17 before impregnation in the step of impregnating the strand f1 with resin.

  The impregnation roller 18 has a function of forcibly immersing the strand f1 in the resin R, and is used in a state where it is immersed in the resin R stored in the impregnation tank 17 even a little.

  The exit guide roller pair 19 (19a, 19b) serves as a squeezing function for the strand f2 impregnated with the resin, and the amount of resin adhesion is controlled here.

  That is, the amount of impregnated resin of the resin-impregnated strand f2 is controlled by controlling the clearance between the upper and lower rollers 19a and 19b and the pressing pressure.

  In this embodiment, the amount of the matrix resin impregnated with respect to the reinforcing fiber f is preferably 30% to 70% in terms of the volume ratio (Vf) of the reinforcing fiber.

  More specifically, if the reinforcing fiber content is less than 30% by volume ratio (Vf), the amount of fibers is so small that physical properties such as strength deteriorate. On the other hand, if it exceeds 70%, the resin will be insufficient. In particular, the volume ratio of reinforcing fibers is optimally in the range of 40% to 60%.

  Further, in the production method of the present embodiment, as described above, carbon fiber can be most suitably used as the reinforcing fiber, but is not limited thereto, and carbon fiber, glass fiber, basalt fiber, etc. Inorganic fibers or organic fibers such as aramid fibers, PBO fibers, polyamide fibers, polyester fibers, and polyarylate fibers can be mixed and used.

  As the matrix resin, epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin, and phenol resin can be used, and among them, epoxy resin is preferably used. Other resins are used for special applications such as a market used at high temperatures and a market requiring special corrosion resistance.

  The strand f2 impregnated with the resin is guided by the guide holes 21 (21a, 21b) formed in the guide 20 and wound by the winding bobbins 22 (22a, 22b) in the winding device 52. FIG. 3A shows a strand f2 that is twisted and impregnated with resin R. FIG.

  Each take-up bobbin 22 is rotationally driven around a rotation shaft 23 (23a, 23b).

  The bobbin 22 around which the resin-impregnated strand f2 is wound is taken to the take-off section 100B3 through the flattened shape (heating / pressing / curing) shown in FIG. Supplied with.

Heating / Pressurizing / Curing Molding, Cooling Process and Take-off Process Referring to FIG. 6, a heating / pressurizing / curing molding / cooling section (in the following description, it may be simply referred to as “molding / curing section”). In 100B1 and 100B2, the bobbin 22 (22a, 22b) in which the resin-impregnated strand f2 is wound by the winding device 52 is installed on the rotating shaft 24 (24a, 24b) of the unwinding device 53. That is, the take-up bobbin 22 functions as an unwind bobbin in the heating / pressing / curing and cooling / curing steps.

  The resin-impregnated unimpregnated resin-impregnated strand f2 wound around the unwinding bobbin 22 (22a, 22b) is unwound from the bobbin 22. The strand f2 is given a predetermined tension between the unwinding device 53 and the molding / curing device 40 constituting the molding / curing sections 100B1 and 100B2, and between the molding / curing device 40 and a take-off device 80 described later. In this state, the molding and curing device 40 is passed through to form a flat FRP plate 2A. The flat FRP plate 2A is then fed under tension to the take-up section 100B3.

  More specifically, the unwinding device 53 of the molded and hardened sections 100B1 and 100B2 is provided with a function such as an electromagnetic brake, and applies appropriate tension to the uncured resin-impregnated strand f2 unwound from the bobbin 22. Can do.

  That is, between the unwinding device 53 and the molding and curing device 40, the strands of reinforced fibers f that are bundled by applying appropriate tension to the strands f2 that are twisted and impregnated with the uncured resin. The cross-sectional shape of the strand f2 that is uniformly strained and fed into the molding and hardening sections 100B1 and 100B2 can be a circular cross-section, that is, a round shape (FIG. 3B).

  In the present embodiment, as the tension, it is preferable to impart a strength of 500 g / piece to 10 kg / piece to the resin-impregnated strand f2. If it is less than 500 g / piece, it is difficult to secure a round shape, and if it exceeds 10 kg / piece, there occurs a problem that the fiber f breaks during production, and stable production becomes impossible. In particular, the tension force is optimally in the range of 2 kg / piece to 8 kg / piece.

  In the specification of the present application, “circular” means to include “substantially circular” in which the diameter ratio in the vertical and horizontal directions in the cross section is within the range of 1.0 to 1.5. To do.

  According to the present embodiment, the twisted and uncured resin-impregnated strand f2 that is unwound from the unwinding bobbin 22 in the manufacturing apparatus 100 having the above-described configuration is guided by the guide member 25 as necessary. As shown in FIG. 3 (b), it is continuously supplied to the heating / pressurizing / curing section 100B1 in a state of being arranged at predetermined intervals (P1, P2). That is, the plurality of strands f2 are arranged such that the two strands f2 and f2 forming each pair are aligned at the interval P1, and the adjacent strand pairs forming this pair are set to have an interval P2 (P1 <P2). Are arranged.

  In the present embodiment, as described above, the heating / pressurizing / curing section 100B1 and the cooling section 100B2 are implemented by the molding / curing apparatus 40 shown in FIG. In this embodiment, the molding and curing device 40 is symmetrically arranged in the vertical direction, and is the lower belt devices 40A and 40B. Since the upper and lower belt devices 40A and 40B have the same structure in this embodiment, the upper belt device 40A will be described.

  Referring to FIGS. 6 to 8 (a) and 8 (b), the upper belt device 40A includes a belt main body 41A that is a steel belt and a heating unit for winding and rotating the belt main body 41A. A pressure roller 42A, a cooling roller 43A, and a pressure roller 44A are provided. As the belt main body 41A, an endless steel belt having a thickness t41 of 0.5 to 1.5 mm can be suitably used. In this example, a stainless steel belt having a thickness t41 of 1.0 mm, a width w41 (see FIG. 8A) of 500 mm, and a circumferential length of 5530 mm was used.

  Further, as shown in FIGS. 6 and 8A, the heating and pressing roller 42A uses a cylindrical steel drum having an outer diameter D42 of 500 mm and a barrel length L42 of 600 mm, as shown in FIGS. The drum is provided with an electric heater (not shown) as a heating source inside the drum. The heating and pressing roller 42A is located in the heating / pressing / curing section 100B1, and heats the belt main body 41A that heats and presses the resin-impregnated strand f2 to a predetermined temperature, for example, 130 ° C. to 180 ° C.

  In this embodiment, the cooling roller 43A is a steel drum similar to the heating and pressure roller 42A. That is, as shown in FIG. 6 and FIG. 8B, a cylindrical steel drum having an outer diameter D43 of 500 mm and a barrel length L43 of 600 mm is used, and a cooling system (cooling water piping or the like) ( (Not shown). The cooling roller 43A cools the belt body 41A located in the cooling section 100B2 to a predetermined temperature, for example, about 5 ° C. to 20 ° C.

  In the belt device 40A configured as described above, the separation distance between the heating and pressing roller 42A and the cooling roller 43A, that is, the distance L40 between the rotation axes of each roller was 1980 mm.

  According to the present embodiment, a plurality of, in this embodiment, six pressure rollers 44A are arranged between the heating and pressure roller 42A and the cooling roller 43A. In the present embodiment, the pressure roller 44A has a diameter D44 of 85 mm and a body length L44 (see FIG. 8B) of 600 mm. Of course, the pressure roller 44A is not limited to the shape and dimensions of the present embodiment. Further, the pressure roller 44A itself may be a heat pressure roller having a heating source.

  As described above, in this embodiment, the lower belt device 40B has the same configuration as the upper belt device 40A. Accordingly, in the lower belt device 40B, members having the same configuration and function as those of the upper belt device 40A are denoted by the same reference numerals with the suffix “B”, and detailed description thereof is omitted.

  Here, in particular, the overall configuration of the molding and curing device 40 will be further described with reference to FIGS. 7 and 8A and 8B.

  The molding and curing device 40 is symmetrically arranged in the vertical direction, and is an enclosure for supporting the lower belt devices 40A and 40B. The upper frame 70A for the upper belt device 40A, and the lower belt device 40B. And a lower frame 70B.

  On the upper frame 70A, a heating and pressing roller 42A, a cooling roller 43A, and a pressing roller 44A of the upper belt device 40A are rotatably supported, and the steel belt 41A is rotated by these rollers 42A, 43A, and 44A. Winding freely. Similarly, a heating and pressure roller 42B, a cooling roller 43B, and a pressure roller 44B of the lower belt device 40B are rotatably supported on the lower frame 70B, and the steel belt 41B is supported by these rollers 42B, 43B, and 44B. It is wound around freely.

  With the above configuration, according to the present embodiment, the upper frame 70A is supported by the lower frame 70B so as to be movable up and down via vertical distance adjusting means (elevating devices) 71 (71a to 71d), which is a hydraulic device, for example. ing. In this embodiment, the lifting device 71 (71a to 71d) rotatably holds the rollers 42 (42A, 42B), 43 (43A, 43B), 44 (44A, 44B) of the belt devices 40A, 40B. In addition, a total of four frames are arranged symmetrically on both sides of the lower frames 70A and 70B.

  Therefore, by driving the vertical distance adjusting means 71 (71a to 71d), the upper belt device 40A is movable in the vertical direction with respect to the lower belt device 40B, and the distance G41 between the steel belts 41A and 41B (FIG. 6). Is set to a predetermined value.

  In this embodiment, the driving pulleys 72A and 72B attached to the rotating shafts of the heating and pressure rollers 42A and 42B of the upper and lower belt devices 40A and 40B, and the driving pulley 74 of the driving motor 73 installed on the lower frame 70B, The drive motor 73 is driven by the drive belt 76 stretched between the tension adjusting roller 75 and the heating and pressure rollers 42A and 42B are rotationally driven, whereby the upper and lower belt devices 40A and 40B are driven. The steel belts 41A and 41B are driven to rotate. Accordingly, the cooling rollers 43A and 43B and the pressure rollers 44A and 44B are also rotationally driven. The steel belts 41A and 41B are moved at a constant speed in a range of 0.1 to 5 m / min, for example.

  Therefore, in this embodiment, the uncured twisted resin-impregnated strands f2 have at least two, usually 50 to 300 strands f2 in a tensioned state, and a pair that rotates opposite to each other. It is fed between the heated steel belts 41A and 41B. The steel belts 41A and 41B are heated to a predetermined temperature via the heating and pressure rollers 42A and 42B. Therefore, the resin-impregnated strand f2 is heated by being sandwiched between the steel belts 41A and 41B. Further, since the steel belts 41A and 41B are set at a predetermined distance G41 by the heating and pressure rollers 42A and 42B and the pressure rollers 44A and 44B, the resin-impregnated strand f2 is formed on both surfaces by the steel belts 41A and 41B. Pressurized from the side, the cross-sectional shape of the strand f2 is formed from a round shape to a flat shape, the resin is cured in that shape, and the shape is cooled by the cooling rollers 43A and 43B.

  According to the present invention, since the resin-impregnated strand f2 is twisted, it is constrained also in the width direction when formed flat in the steel belt pressurizing portion, so that a flat strand having a constant width is manufactured.

  As described above, the resin-impregnated strand f2 fed to the molding and curing device 40 including the belt devices 40A and 40B having the specific configuration described in the present embodiment is predetermined in the heating / pressurizing / curing section 100B1. Are heated and pressurized at a pressure and a temperature of 2 mm to form a flat shape, and then cured to form a flat wire 2, and at the same time, closely bonded to each other to form a flat FRP plate 2 </ b> A. In this embodiment, the gap G41 between the belt bodies 41A and 41B holding the strand f2 in order to obtain the flat fiber reinforced plastic strand 2 having a desired thickness (t) is adjusted as described above. It is appropriately adjusted by means (elevating means) 71 (71a to 71d).

  Usually, the moving speed of the strand f2 moving through the molding / curing sections 100B1 and 100B2, the heating temperature of the heating / pressurizing / curing section 100B1, the pressing force, and the cooling temperature of the cooling section 100B2 are the types of the impregnated resin. The amount of resin impregnation of the flat fiber reinforced plastic strand 2 as a product is determined as appropriate. By increasing the lengths LB1 and LB2 of the heating / pressurizing / curing section 100B1 and the cooling section 100B2, the production speed of the flat fiber reinforced plastic strand 2 can be increased.

  By the manufacturing method of the present embodiment described above, as shown in FIGS. 1, 3B, and 3C, the two strands f2 and f2 aligned at the interval P1 having a round cross section are heated. In the pressurizing / curing section 100B1, a flat strand 2s having a rectangular cross section is formed, and the two flat strands 2s, 2s are closely bonded to each other on both sides to form a flat strand plate 2As. Form. Therefore, according to the present embodiment, the flat strands 2s and 2s having the flat cross section are tightly bonded as compared with the case where the strands f2 and f2 having the circular cross section are simply tightly bonded (FIGS. 3D and 3D-1). Therefore, as shown in FIGS. 3 (d) and 3 (d-2), it is possible to eliminate the space (v) where there is no reinforcing fiber generated between the two strands f2 and f2 that are in close contact with each other, and to increase the basis weight. it can.

  On the other hand, the circular cross-section strands f2 and f2 that are spaced apart at the interval P2 are narrowed, and a gap (g) is formed between the flat strand plates 2As and 2As. Then, each flat strand board 2As is hardened and made into the flat FRP board 2A.

  Subsequently, the plurality of flat FRP plates 2A cooled in the cooling section 100B2 and peeled off from the belts 41A and 41B are fed to the take-up section 100B3 and wound around the reel 80 through the strand surface polishing apparatus 50. The surface polishing apparatus 50 will be described in detail later.

  The flat strand 2s and the flat strand plate 2As in the uncured state adhere to the belt 41 (41A, 41B) of the molding and curing device 40, and the flat FRP plate 2A in the cured state is satisfactorily peeled from the belts 41A and 41B. In order to prevent this from being hindered, it is preferable to keep the outer surfaces of the belts 41A and 41B smooth. For this purpose, as shown in FIG. 6, for example, a polishing means 45 (45A, 45B), such as a polishing cloth, is provided, and the steel belt surface may be polished constantly or periodically. . Further, if necessary, release agent application means 46 (46A, 46B) can be provided together with the steel belt polishing means 45 or instead of the polishing means 45. The release agent application means 46 is provided, the release agent is thinly applied to the belt surface, and the release agent is baked by heating the steel belt, whereby continuous good peeling becomes possible. As the release agent, a fluorine-based release agent and a silicon-based release agent are preferably used.

  In addition, when a release agent is applied to the surface of the steel belt, the release agent is attached to the surface of the formed flat fiber reinforced plastic strand 2, so that there is a problem that necessary adhesion performance is not obtained depending on the subsequent usage. .

  Therefore, in this embodiment, when a release agent is used as necessary, a surface polishing device as the release agent removing means 50 is installed after the molding and curing device 40 as described above. As the surface polishing apparatus 50, the upper and lower surfaces of the molded and flattened flat FRP plate 2A are lightened, and the surface of the strand is polished by sandpaper, iron file, or blasting. With such a simple polishing apparatus 50, the release agent can be removed from the surface of the flat FRP plate 2A, and further, the unevenness of the polishing can be improved by the anchor effect to improve the adhesiveness over the flat FRP plate without the release agent. I understood the result. For removing the release agent from the flat FRP plate 2A, in addition to the above surface polishing, a chemical cleaning device using a solvent, for example, toluene or the like can be employed.

  As described above, the flat FRP plate 2A delivered from the molding and curing device 40 has a large diameter of 1 m or more after the surface of each flat FRP plate 2A is polished by the surface polishing device 50 in the take-off section 100B3. It is taken up at a predetermined speed by the take-up reel 80.

(FRP sheet manufacturing method and apparatus)
Next, a method for manufacturing the FRP sheet 1 will be described.

  The flat FRP plate 2A for producing the FRP sheet 1 is manufactured in the same manner as the method for manufacturing the flat FRP plate 2A described with reference to FIGS. 4 to 8A, 8B, etc. The manufacturing apparatus 100 (100A, 100B) can be used. However, the take-over section 100B3 in the oblate shape, cooling and take-up section 100B is different only in that the sheet forming apparatus 60 is disposed after the surface polishing apparatus 50 as shown in FIG.

  That is, the manufacturing apparatus 100 (100A, 100B) for manufacturing the FRP sheet 1 according to the present invention includes the fiber feeding, resin impregnation and winding section 100A (FIG. 4) shown in FIG. 4 and the flatness shown in FIG. It is composed of molding (heating / pressing / curing), cooling, and a take-off section 100B (100B1, 100B2, 100B3).

  According to the present embodiment, the resin impregnated strand f2 subjected to the twisting process and the resin impregnation step is manufactured by the manufacturing apparatus 100A shown in FIG. 4 as described above.

  Next, the strand f2 that has been subjected to the twisting process and the resin impregnation step has the shape of the strand f2 in the flattened shape (heating / pressing / curing), cooling and taking-up sections 100B1, 100B2, and 100B3 of the manufacturing apparatus 100B shown in FIG. Flat shape molding and resin curing are performed to produce a flat FRP plate 2A, and then an FRP sheet 1 is produced.

  More specifically, according to the present embodiment, as shown in FIG. 9, the plurality of flat FRP plates 2A cooled by the heating / pressing / curing section 100B1 and the cooling section 100B2 and separated from the belt are The FRP sheet 1 passes through the polishing device 50 and the sheet forming device 60 and is wound up on the reel 80.

  As described above, the surface of the flat FRP plate 2A peeled off from the heating / pressurizing / curing and cooling device 40 is extremely smooth, and in some cases, a release agent may be attached. The surface smoothness of the flat FRP plate 2A is good, or the release agent attached to the surface is used when the FRP sheet 1 as a product is bonded to a structure as a reinforcing material, or as an FRP material for RTM molding It is not preferable when doing so.

  Therefore, as described above, a release agent removing unit such as the surface polishing device 50 is provided at the outlet of the molding and curing device 40 to roughen the surface of the flat FRP plate 2A from the molding and curing device 40. Further, it is preferable to remove the release agent from the surface of the flat FRP plate 2A.

  The flat FRP plates 2A whose surfaces have been roughened to a desired roughness by the surface polishing apparatus 50 and from which the release agent has been removed are spaced from each other as shown in FIG. 3 (c). Then, the sheet is fed to the sheet forming apparatus 60 in a state of being aligned in the longitudinal direction. Each flat fiber reinforced plastic strand 2 is bonded to the fixing member 3 by a sheet forming apparatus 60 to form an FRP sheet 1 as shown in FIG. In the sheet forming apparatus 60, a fixing member supply means 61 for supplying the fixing member 3 and the fixing member 3 are bonded to the flat fiber reinforced plastic strand 2, and a plurality of flat fiber reinforced plastic strands 2 are integrated into a sheet shape. A heating adhesive cooling pressurizing means 62 is disposed.

  That is, in this embodiment, the fixing member supply means 61 supplies the fixing member 3 which is a weft, a mesh-like member or the like to both sides or one side of the aligned flat FRP plates 2A as described above. Subsequently, it is united by the heating adhesion cooling pressurizing means 62.

  In the above description, for the FRP sheet 1, the flat FRP plate 2A is produced from the resin-impregnated uncured strand f2 by the manufacturing apparatus 100B shown in FIG. 9, and subsequently fixed to the flat FRP plate 2A by the sheet forming apparatus 60. It demonstrated as what is produced continuously by supplying the member 3. FIG. However, the flat FRP plate 2A produced by the production apparatus 100B shown in FIG. 6 and taken up by the take-up reel 80 can be used. That is, a predetermined number of flat FRP plates 2A are unwound from the take-up reel 80, arranged in a plane as shown in FIG. 2, and the sheet forming apparatus 60 having the same configuration as described with reference to FIG. And can be manufactured by holding them together by the fixing member 3.

  Whichever method is used, the FRP sheet 1 according to the present invention has a predetermined gap (g) between the adjacent flat fiber reinforced plastic plates 2A and 2A along the longitudinal direction, as described above. Is provided. This gap (g) can be 0.1 mm to 3.0 mm.

  According to the manufacturing method of the flat FRP plate 2A and the FRP sheet 1 according to the present invention described above, it has the following features.

In the manufacturing method of the present embodiment, a resin-impregnated strand f2 having a round shape is formed between heated steel belts 41A and 41B by applying an appropriate tension to the resin-impregnated strand in which a predetermined twist is put. By sandwiching and pressing, for example, using a strand having a large diameter of 50K, the fiber basis weight is large, the thickness (t) is 1.0 mm to ² mm (the fiber basis weight is 900 to 1800 g / m ² ), and the width (W) is 5 mm to 500 mm. The flat FRP plate 2A (or the FRP sheet 1) can be efficiently manufactured, that is, the molding yield can be greatly increased. Moreover, according to the manufacturing method of the present Example, it turned out that there is little damage to the strand f2 impregnated with resin, and there is almost no frequency of thread breakage during manufacture. Therefore, the flat FRP plate 2A of the present invention, in particular, the FRP sheet 1, has a high weight per unit area and high strength, but has good deformation performance and can be suitably used for RTM molding and the like. The body can be manufactured.

1 FRP sheet (fiber reinforced plastic sheet)
2 (2a, 2b) flat FRP wire (flat fiber reinforced plastic wire)
2s flat strand 2A (2A1-2An) flat FRP plate (flat fiber reinforced plastic plate)
2As flat strand plate 3 fixing member 17 resin impregnation tank 40 (40A, 40B) molding curing device (heating / pressing / curing and cooling device)
41 (41A, 41B) Steel belt (belt body)
42 (42A, 42B) Heating / pressure roller 43 (43A, 43B) Cooling roller 44 (44A, 44B) Pressure roller 45 Steel belt polishing means 50 Strand surface polishing device (release agent removing means)
60 sheeting device 80 take-up reel f reinforcing fiber filament f1 reinforcing fiber bundle (strand)
f2 resin impregnated uncured strand R matrix resin

Claims (20)

Forming and curing a twisted resin-impregnated strand containing a large number of reinforcing fibers to form at least two flat fiber reinforced plastic wires having a flat cross-sectional shape, substantially free of gaps along the longitudinal direction A flat fiber reinforced plastic plate having a flat cross-sectional shape formed in close contact with each other,
The flat fiber reinforced plastic wire has a thickness (t) of 0.2 to 3.0 mm and a width (w) of 1.0 to 5.0 mm.   The flat fiber-reinforced plastic plate according to claim 1, wherein the resin-impregnated strand is formed by converging 6000 to 60000 reinforcing fibers and impregnating the resin.   The flat fiber-reinforced plastic plate according to claim 1 or 2, wherein the content of the reinforcing fiber in the resin-impregnated strand is 30% to 70% in volume ratio (Vf).   The flat fiber reinforced plastic plate according to any one of claims 1 to 3, wherein the number of twists of the strand is 5 times / m to 30 times / m. The reinforcing fiber is used by mixing inorganic fiber such as carbon fiber, glass fiber, basalt fiber, or organic fiber such as aramid fiber, PBO fiber, polyamide fiber, polyester fiber and polyarylate fiber. ,
The flat fiber reinforced plastic according to any one of claims 1 to 4, wherein the matrix resin is one of an epoxy resin, a vinyl ester resin, an MMA resin, an unsaturated polyester resin, or a phenol resin. Board.   The flat fiber reinforced plastic plate according to any one of claims 1 to 5, wherein the flat fiber reinforced plastic plate is composed of 2 to 50 flat fiber reinforced plastic wires. The total area of the gaps formed between the flat fiber reinforced plastic wires along the longitudinal direction of the flat fiber reinforced plastic wire is 0.1 m ² or less per 1 m ^{2 of the} flat fiber reinforced plastic plate. The flat fiber reinforced plastic plate according to any one of claims 1 to 6. The flat fiber reinforced plastic plate according to any one of claims 1 to 7, comprising at least two or more sheets,
The plurality of flat fiber reinforced plastic plates are aligned in the longitudinal direction and are integrally held by a fixing member to form a sheet, and a predetermined length along the longitudinal direction is provided between the adjacent flat fiber reinforced plastic plates. A fiber-reinforced plastic sheet characterized in that a gap (g) is provided.   The fiber-reinforced plastic sheet according to claim 8, wherein the predetermined gap (g) is 0.1 mm to 3.0 mm. (A) At least two or more unimpregnated twisted resin-impregnated strands containing a large number of reinforcing fibers are aligned in one direction along the longitudinal direction and arranged in a plane,
(B) Heating the strands arranged in a plane and pressurizing from both sides of the strands arranged in a plane to form a cross-sectional shape of the strand into a flat shape, and at least two at the same time A flat strand plate having a flat cross-sectional shape formed by closely bonding the flat strands along the longitudinal direction so as to have substantially no gap therebetween is produced, and the resin impregnated in the flat strand plate is cured. A flat fiber reinforced plastic plate,
A method for producing a flat fiber reinforced plastic sheet, characterized in that   The method for producing a flat fiber-reinforced plastic plate according to claim 10, wherein the resin-impregnated strand is obtained by converging 6000 to 60000 reinforcing fibers and impregnating the resin.   The method for producing a flat fiber-reinforced plastic plate according to claim 10 or 11, wherein the content of the reinforcing fiber in the resin-impregnated strand is 30% to 70% in volume ratio (Vf).   The method for producing a flat fiber-reinforced plastic plate according to any one of claims 10 to 12, wherein the number of twists of the resin-impregnated strand is 5 times / m to 30 times / m.   The flat fiber reinforced fiber according to any one of claims 10 to 13, wherein in the step (b), the resin-impregnated strand is tensioned at a strength of 500 g / piece to 10 kg / piece. Manufacturing method of plastic plate.   In the step (b), the strands arranged in a plane are sandwiched and heated by a heated steel belt, and the strands are pressed from both sides of the strands arranged in a plane to be cross-sectioned. The method for producing a flat fiber-reinforced plastic plate according to any one of claims 10 to 14, wherein the method is performed by forming the shape into a flat shape.   16. The method for producing a flat fiber reinforced plastic plate according to claim 15, wherein in the step (b), a release agent is applied to the steel belt, and the strands arranged in a plane are sandwiched. .   The surface of the flat fiber reinforced plastic plate produced in the step (b) is polished or washed with a solvent to remove the release agent attached to the surface. The manufacturing method of the flat fiber reinforced plastic board of description.   A flat fiber-reinforced plastic plate produced by the manufacturing method according to any one of claims 10 to 17 is arranged in a plane and is integrally held by a fixing member. Method.   The method for producing a fiber-reinforced plastic sheet according to claim 18, wherein a predetermined gap (g) is provided along the longitudinal direction between the adjacent flat fiber-reinforced plastic plates.   The method for producing a fiber-reinforced plastic sheet according to claim 19, wherein the predetermined gap (g) is 0.1 mm to 3.0 mm.

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