HK1221437B - Flat fiber-reinforced plastic strand, flat fiber-reinforced plastic-strand sheet, and production method for same - Google Patents

Description

Flat fiber-reinforced plastic twisted rope, flat fiber-reinforced plastic twisted rope piece and manufacturing method thereof

Technical Field

The present invention relates to a fiber-reinforced plastic wire rod having a flat cross section (hereinafter referred to as a "flat fiber-reinforced plastic twisted string") and a method for producing the same, and also relates to a fiber-reinforced plastic sheet in which the flat fiber-reinforced plastic twisted string is arranged in a sheet shape (hereinafter referred to as a "flat fiber-reinforced plastic twisted string sheet") and a method for producing the same. The flat fiber-reinforced plastic twisted rope sheet is widely used for RTM molding (resin transfer molding) and the like as a large FRP (fiber-reinforced plastic material) used for, for example, blades for windmills, vehicles, ships and the like, and is also used as a reinforcing material for reinforcing concrete structures, steel structures, and fiber-reinforced plastic structures as civil engineering and construction structures.

Background

Conventionally, a fiber-reinforced plastic sheet produced by arranging fiber-reinforced plastic strands produced using reinforcing fibers such as carbon fibers in a sheet form has been widely used for RTM molding and the like as a large FRP (fiber-reinforced plastic material) used for blades for windmills, vehicles, ships, and the like, for example. The fiber-reinforced plastic sheet can also be used as a reinforcing material for reinforcing a concrete structure, a steel structure, or a fiber-reinforced plastic structure, which is a civil engineering and construction structure, by abutting against the fiber-reinforced plastic structure.

Here, when the fiber-reinforced plastic sheet is used for RTM molding or the like, or when the fiber-reinforced plastic sheet is reinforced by abutting the fiber-reinforced plastic sheet against a structure such as a concrete structure or a steel structure, if the fiber-reinforced plastic wires constituting the fiber-reinforced plastic sheet are circular, the sheet thickness (i.e., the reinforcement thickness) increases, and the amount of the resin to be bonded increases. On the other hand, when the fiber-reinforced plastic wires constituting the fiber-reinforced plastic sheet are flat, the reinforcement thickness can be made thin and the amount of resin to be bonded can be reduced, although the same reinforcement strength is achieved.

In addition, similarly to the case where the fiber-reinforced plastic wire is used as a reinforcing rib embedded in a concrete structure, a glass fiber-reinforced plastic structure, or the like, since the thickness of a portion into which the reinforcing rib enters can be reduced when the wire is in a flat shape, a large amount of reinforcing fibers can be put into the wire at a constant thickness, and the fiber content (that is, Vf) in a constant volume and the target cross-sectional rigidity and strength of the structure can be manufactured using a smaller thickness than when the wire is in a circular shape.

However, when a flat fiber-reinforced plastic wire, that is, a flat fiber-reinforced plastic strand, is manufactured by drawing, as in the case of a round wire, there is a problem that a die is limited and the number of manufactured strands is limited to the limit of the number of holes. Further, in order to prevent the matrix resin from adhering to the mold, a release agent must be used, and there is a problem that adhesion between the molded product and the resin or concrete to be adhered later does not proceed smoothly.

Patent documents 1 and 2 describe the following production methods:

(1) a method for producing a fiber-reinforced plastic wire rod having a circular cross section, which comprises impregnating a resin with a continuously fed reinforcing fiber bundle (strand) while twisting the reinforcing fiber bundle, or impregnating a resin-impregnated strand with a resin, twisting the resin-impregnated strand, and applying a tensile force of a predetermined magnitude to the resin-impregnated and twisted strand; and

(2) a method for manufacturing a round twisted rope by using a flat die (mold) for forming the round twisted rope impregnated with resin and not cured into a flat shape, wherein the flat die and a flat wire product are released from each other without using a release agent, and thin cloth (polyester-based fabric such as a release layer) which is not bonded to an adhesive is continuously inserted into the upper and lower surfaces of the formed wire and peeled off after curing.

In these manufacturing methods, since it is only necessary to introduce the resin-impregnated round fiber bundle into the flat-plate-shaped mold, and the mold for metal is protected from the top and bottom thereof by the release sheet without directly contacting the resin-impregnated fiber bundle, there are advantages in that damage to the resin-impregnated fiber bundle is small, there is little breakage in manufacturing, and the molding yield can be greatly improved.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2012 and 131874

Patent document 2: japanese patent laid-open No. 2012 and 131875

Disclosure of Invention

Problems to be solved by the invention

However, in the production methods described in patent documents 1 and 2, it is necessary to use an auxiliary material such as a release layer (release fabric), and there are many problems such as material cost, facility cost, and waste of the used auxiliary material.

The inventors of the present invention have further conducted research and experiments based on the techniques described in the above patent documents 1 and 2, and have found that a flat fiber-reinforced plastic twisted rope (flat fiber-reinforced plastic twisted rope) can be produced with high efficiency by sandwiching and twisting an uncured resin-impregnated twisted rope, which is impregnated with resin, between two heated metal belts to flatten and cure the rope simultaneously.

The present invention has been completed based on the new findings of the inventors of the present invention described above.

The invention aims to provide a flat fiber-reinforced plastic twisted rope which is manufactured by hardening a twisted resin-impregnated twisted rope and has no disorder of fiber orientation, and a flat fiber-reinforced plastic twisted rope piece manufactured by using the flat fiber-reinforced plastic twisted rope.

Another object of the present invention is to provide the flat fiber-reinforced plastic twisted rope and the method for manufacturing the flat fiber-reinforced plastic twisted rope piece, which can solve the problems of material cost, equipment cost, and waste of used auxiliary materials, etc., without using auxiliary materials.

Means for solving the problems

The above object is achieved according to the invention by a flat fiber-reinforced plastic twisted rope, a flat fiber-reinforced plastic twisted rope piece and a method for manufacturing the same. In summary, according to a first aspect of the present invention, there is provided a method of manufacturing a flat fiber-reinforced plastic twisted rope, characterized in that (a) an uncured twisted resin-impregnated twisted rope comprising a plurality of reinforcing fibers is fed under tension between a pair of heated metal strips which are moved in rotation relative to each other,

(b) the resin-impregnated twisted rope is sandwiched and heated by the metal belt, and the cross-sectional shape of the twisted rope is formed into a flat shape by pressing the resin-impregnated twisted rope from both sides thereof, and the cross-sectional shape is cooled while the resin is hardened.

According to a second aspect of the present invention, there is provided a method for producing a flat fiber-reinforced plastic twisted rope piece, characterized by (a) arranging a plurality of uncured twisted resin-impregnated twisted ropes containing a plurality of reinforcing fibers in a planar manner while being aligned in one direction along the longitudinal direction of the twisted ropes, feeding the twisted ropes in a tensioned state between a pair of heated metal strips that are moved in a rotating manner while facing each other,

(b) heating the resin-impregnated twisted rope while sandwiching the twisted rope with the metal tape, pressing the resin-impregnated twisted rope from both sides of the resin-impregnated twisted rope to form a cross-sectional shape of the twisted rope into a flat shape, hardening the resin in the shape, and cooling the resin-impregnated twisted rope in the shape to produce a flat fiber-reinforced plastic twisted rope,

(c) then, the flat fiber-reinforced plastic strands arranged in a planar shape are integrally held by a fixing member and formed into a sheet shape.

According to the first and second embodiments of the present invention, the number of twists of the resin-impregnated stranded rope is 5 to 30 times/m.

According to another embodiment of the first and second inventions, the resin-impregnated stranded rope is tensioned at a strength of 500 g/piece to 10 kg/piece.

According to another embodiment of the first and second inventions, the release agent is applied to the metal belt which is rotating or is periodically, and the release agent is sintered by heating the metal belt.

According to another embodiment of the first and second inventions, the surface of the flat fiber-reinforced plastic twisted rope produced in the step (b) is polished or washed with a solvent to remove the release agent adhering to the surface.

According to another embodiment of the second invention, the surface of the flat fiber-reinforced plastic twisted rope produced in the step (b) of the second invention is polished or washed with a solvent to remove the release agent adhering to the surface, and then the step (c) is performed.

According to another embodiment of the second invention, in the step (c), the flat fiber-reinforced plastic strands arranged in a planar shape have a predetermined gap (g) formed in a longitudinal direction.

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

According to a third aspect of the present invention, there is provided a flat fiber-reinforced plastic twisted rope, which is produced by the method for producing a flat fiber-reinforced plastic twisted rope according to the first aspect of the present invention, wherein the fiber-reinforced plastic twisted rope has a cross-sectional shape formed in a flat shape, and has a thickness (t) of 0.2mm to 5.0mm and a width (w) of 1.0mm to 10.0 mm.

According to a fourth aspect of the present invention, there is provided a flat fiber-reinforced plastic twisted rope piece formed in a sheet shape by integrally holding flat fiber-reinforced plastic twisted ropes arranged in a planar shape by a fixing member,

the fiber-reinforced plastic twisted piece is manufactured according to the method for manufacturing a flat fiber-reinforced plastic twisted piece according to the second aspect of the present invention,

the flat fiber reinforced twisted rope is formed to have a thickness (t) of 0.2mm to 5.0mm and a width (w) of 1.0mm to 10.0 mm.

Effects of the invention

According to the present invention, it is possible to provide a flat fiber-reinforced plastic twisted rope in which the fiber orientation is not disturbed, and a flat fiber-reinforced plastic twisted rope piece manufactured using the flat fiber-reinforced plastic twisted rope. Further, according to the present invention, it is possible to provide the flat fiber-reinforced plastic twisted rope and the method for manufacturing the flat fiber-reinforced plastic twisted rope piece, which solve the problems of material cost, facility cost, and disposal of used auxiliary materials, without using auxiliary materials.

Drawings

Fig. 1 is a schematic configuration diagram of a manufacturing apparatus for explaining an embodiment of a method of manufacturing a flat fiber-reinforced plastic twisted rope according to the present invention.

Fig. 2 is a schematic configuration diagram illustrating the operation of the pay-off bobbin in the manufacturing apparatus for illustrating an embodiment of the method of manufacturing a flat fiber-reinforced plastic twisted rope according to the present invention.

Fig. 3 is a schematic configuration diagram illustrating an embodiment of a manufacturing apparatus for manufacturing a flat fiber-reinforced plastic twisted rope according to the present invention.

Fig. 4 is a schematic configuration perspective view of a forming and hardening apparatus in the manufacturing apparatus of fig. 3.

Fig. 5 is a schematic cross-sectional view of the form-hardening apparatus of fig. 4, fig. 5(a) is a cross-sectional view taken substantially along the line a-a of fig. 4, and fig. 5(B) is a cross-sectional view taken substantially along the line B-B of fig. 4.

Fig. 6(a) is a perspective view of an example of a resin-impregnated stranded rope used for manufacturing a flat fiber-reinforced plastic stranded rope according to the present invention, fig. 6(b) is a cross-sectional view showing an arrangement state of the resin-impregnated stranded rope before heating and pressurizing, and fig. 6(c) is a cross-sectional view showing an arrangement state of the flat fiber-reinforced plastic stranded rope after heating, pressurizing and hardening.

Fig. 7 is a schematic configuration diagram illustrating an example of a manufacturing apparatus for manufacturing a flat fiber-reinforced plastic twisted piece according to the present invention.

Fig. 8 is a diagram illustrating a cross-sectional shape of a flat fiber-reinforced plastic stranded rope according to the present invention.

Fig. 9 is a diagram illustrating an embodiment of a flat fiber-reinforced plastic twisted piece according to the present invention.

Detailed Description

Hereinafter, a flat fiber-reinforced plastic twisted rope and a method for manufacturing the same, and a flat fiber-reinforced plastic twisted rope piece manufactured using the flat fiber-reinforced plastic twisted rope and a method for manufacturing the same according to the present invention will be described with reference to the drawings.

Example one

(Flat fiber-reinforced Plastic twisted rope and Flat fiber-reinforced Plastic twisted rope piece)

First, a flat fiber-reinforced plastic strand 2, which is a fiber-reinforced plastic wire having a flat cross section and is manufactured by the manufacturing method of the present invention, will be described.

Fig. 8 shows a cross-section of a flat fibre-reinforced plastic strand 2 manufactured according to the manufacturing method of the invention. The flat fiber-reinforced plastic twisted rope 2 is a wire rod formed by impregnating a plurality of reinforcing fibers f with a matrix resin R and hardening the resin, the cross-sectional shape of which is formed in a flat shape, that is, a rectangular shape.

The flat fiber-reinforced plastic twisted rope 2 manufactured by the manufacturing method of the present invention has a relatively appropriate thickness (t) of 0.2mm to 5.0mm and a width (w) of 1.0mm to 10.0 mm. When the thickness (t) is less than 0.2mm, breakage of the reinforcing fibers f frequently occurs during production. On the other hand, when the thickness (t) exceeds 5.0mm, the detailed description will be given later with reference to fig. 1, but when the resin-impregnated reinforcing fiber bundle (resin-impregnated stranded cord) f2 is wound around the winding bobbin 22, the fiber f is bent, and the physical properties such as strength of the flat fiber-reinforced plastic stranded cord 2 after hardening are remarkably deteriorated. The flat fiber-reinforced plastic strand 2 has a thickness (t) of 0.4mm to 1.5mm and a width (w) of 1.2mm to 4.5 mm.

On the other hand, in the production method of the present invention, carbon fibers are most preferably used as the reinforcing fibers, but the present invention is not limited thereto, and any one or more of inorganic fibers such as carbon fibers, glass fibers, and basalt fibers, and organic fibers such as aramid fibers, PBO fibers, polyamide fibers, polyester fibers, and polyarylate fibers may be mixed and used.

The matrix resin is any one of epoxy resin, vinyl ester resin, MMA resin, unsaturated polyester resin or phenolic resin.

Next, a flat fiber-reinforced plastic twisted piece produced using the flat fiber-reinforced plastic twisted rope 2 will be described.

As shown in fig. 9, in the flat fiber-reinforced plastic twisted rope sheet 1, the flat fiber-reinforced plastic twisted ropes 2 are arranged in a cord shape by being doubled in one direction, and the wires 2 are separated from each other in the vicinity of each other with a gap (g) (g ═ 0.1mm to 3.0mm) therebetween and fixed by the fixing fiber material 3.

The flat fiber-reinforced plastic twisted piece 1 thus produced is appropriately determined according to the purpose of use, but it can be produced so that the whole width (W) is generally 100 to 500mm and the length (L) is 100m or more due to handling problems, and it can be cut appropriately for use at the time of use.

The fixing fiber material 3 may be only the weft yarn 3b in fig. 9, but may be a biaxial-structured mesh fabric composed of the warp yarn 3a and the weft yarn 3b as shown in the figure. Of course, the mesh fabric is not limited to a one-axis or two-axis structure, but may be a three-axis or other multi-axis structure. In the mesh fabric 3 of the present embodiment, the distances w1, w2 between the warp yarns 3a and the weft yarns 3b are not limited to this, but are usually selected within the range of 0.1mm to 100mm intervals in consideration of the workability of the produced fiber sheet 1. The distances w1, w2 may be the same or different.

The diameter of the strands may be set to 50 to 1000 μm, and a doubled product of glass fiber, carbon fiber, aramid fiber, polyester fiber, vinylon fiber, or the like may be used.

In the present embodiment, the case where the mesh-like woven fabric is used as the fixing fiber material 3 is described, but the present invention is not limited thereto. A conventionally used fused mesh support sheet produced not only by a woven fabric but also by single-axis, double-axis, or multi-axis or more than double-axis fusion of mutually overlapping and fusing strands can be used. As the molten mesh support sheet, for example, a molten mesh support sheet produced by biaxial or multiaxial processes in which a low-melting thermoplastic resin is impregnated in advance into glass fibers or organic fibers having a diameter of 2 to 50 μm, or a molten mesh support sheet formed of a composite fiber having a double structure in which a heat-fusible resin (for example, a heat-fusible polyester) is mixed with the surface of glass fibers or organic fibers having a diameter of 2 to 50 μm and forming a core portion, or the like can be used.

Further, as the fixing fiber material 3, a nonwoven fabric or the like made of glass fiber, organic fiber or the like and having a thickness of about 0.1mm to 0.3mm may be used.

The more detailed configuration of the flat fiber-reinforced plastic twisted rope 2, the flat fiber-reinforced plastic twisted rope piece 1, and the like will be further clarified in the following description of the method for manufacturing the flat fiber-reinforced plastic twisted rope 2 and the flat fiber-reinforced plastic twisted rope piece 1.

(method and apparatus for manufacturing Flat fiber-reinforced Plastic twisted rope)

Next, a method of manufacturing the flat fiber-reinforced plastic twisted rope 2 will be explained.

Fig. 1 to 5 show an example of a manufacturing apparatus 100(100A, 100B) for manufacturing the flat fiber-reinforced plastic twisted rope 2 according to the present invention.

In the present embodiment, the manufacturing apparatus 100(100A, 100B) of the flat fiber-reinforced plastic strand 2 is composed of a fiber feeding, resin impregnation, winding section 100A (fig. 1) and flat forming (heating, pressing, hardening), cooling, and retrieving section 100B (100B1, 100B2, 100B3) (fig. 3).

Fig. 1 shows a fiber feeding, resin impregnation, and winding section 100A of a manufacturing apparatus 100, in which a twisted cord (fiber bundle) f1 composed of a plurality of reinforcing fibers f is moved from the left side to the right side in the drawing, and during this time, twisting and resin impregnation are performed to manufacture a resin-impregnated twisted cord f 2.

Fig. 3 shows a flat forming (heating, pressing, hardening), cooling, and retrieving section 100B of the manufacturing apparatus 100, and the resin-impregnated twisted rope f2 subjected to the twisting process and the resin impregnation process moves from the left side to the right side in the drawing, and the twisted rope f2 is formed into a flat shape and hardened with resin to produce the flat fiber-reinforced plastic twisted rope 2.

Further, in the fiber feeding, resin impregnation, and winding section 100A shown in fig. 1, a plurality of (usually 3 to 18, and two in this embodiment for simplification of the drawing) pay-off bobbins (cylindrical winding members) 11(11a, 11b) for supplying fibers are prepared, and a predetermined number of twisted ropes f1 of reinforcing fibers f not impregnated with resin are bundled and wound around each bobbin 11.

The twisted string f1 wound around each bobbin 11 is continuously fed to the resin impregnation step in which the resin impregnation tank 17 is disposed. At the same time, the twisted string f1 is twisted (tow supply and twisting process).

That is, the twisted rope f1 fed to the resin impregnation step is impregnated with resin in the resin impregnation tank 17, and the resin-impregnated twisted rope f2 is wound around the winding bobbins 22(22a, 22b) in a twisted state (resin impregnation and twisting process step).

In the flat forming (heating, pressing, hardening), cooling, and retrieving section 100B shown in fig. 3, at least one, usually a plurality of, twisted strands f2 of the twisted strands f2 impregnated with resin are paid out and tensioned from a plurality of bobbins 22 (two bobbins 22(22a, 22B) in the drawing for easy understanding) of usually 50 to 300, and introduced into a heating, pressing, hardening, and cooling device (hereinafter referred to as a "forming and hardening device") 40 constituting the flat forming (heating, pressing, hardening) section 100B1 and the cooling section 100B 2. The resin-impregnated twisted rope f2 is formed into a flat shape by heating and pressing in a tensioned state, the twisted rope f2 having a circular cross section, and then hardened and cooled to form the flat fiber-reinforced plastic twisted rope 2. In particular, as described later, when the mold release agent is used in the form curing device 40, the mold release agent removing member 50, for example, a strand surface polishing device is disposed to remove the mold release agent from the surface of the strand 2. Therefore, the flat fiber-reinforced plastic strands 2 fed out from the form-hardening device 40 are wound at a predetermined speed by the winding reel 80 having a large diameter of 1m or more after the surface of each flat fiber-reinforced plastic strand 2 is ground by the surface grinding device 50 in the retrieval section 100B 3.

In this way, by applying a predetermined tensile force to the twisted resin-impregnated twisted cord f2 introduced into the mold curing device 40 in the heating, pressing and curing steps by the mold curing device 40 and the take-up reel 80, each resin-impregnated twisted cord f2 is molded into a flat shape in a predetermined tensioned state. Therefore, the plurality of resin-impregnated twisted cords f2 introduced into the heating, pressing, and curing section 100B1 in a parallel state are heated, pressed, and cured in a state aligned in the traveling direction, and alignment disorder of the twisted cords f2 (i.e., the single fibers f) is suppressed.

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

Fiber bundle supplying and twisting process

In the present embodiment, as will be understood with reference to fig. 1 and 2, in the fiber supply, resin impregnation, and winding section 100A, the bobbins 11(11a, 11b) are attached to the rotary shafts 12(12a, 12b) provided in the pay-off device 51, and the rotary shafts 12 are rotatably attached to the rotary main shafts 13(13a, 13b) of the pay-off device.

The bobbins 11(11a, 11b) are rotated around the rotary shafts 12(12a, 12b) of the bobbins 11(11a, 11b) by the driving motor M and the gear transmission mechanism G, and the twisted string f1 wound around the bobbins 11(11a, 11b) is paid out. At the same time, as described above, the bobbins 11(11a, 11b) rotate around the rotation shafts 12(12a, 12b) together with the rotation shafts 12(12a, 12b) around the rotation main shafts 13(13a, 13 b).

That is, the spool 11 rotates about the rotation shaft 12 and also rotates about the rotation main shaft 13, and the twisted rope f1 is paid out.

The twisted string f1 paid out from the bobbin 11 is guided by the guide hole 15(15a, 15b) formed in the guide 14 and guided into the resin impregnation tank 17 by the entrance guide roller 16.

With the above configuration, the twisted rope f1 is supplied to the impregnation step in which the resin impregnation tank 17 is provided.

The number of twists per meter can be controlled by adjusting the rotation speed of the bobbin 11 around the rotating main shaft 13 and the paying-off speed of the twisted string f 1.

According to the present embodiment, as described above, in order to produce a flat fiber-reinforced plastic twisted rope 2 having a thickness (t) of 0.2 to 5.0mm and a width (w) of 1.0 to 10.0mm, for example, the diameter (d) of the twisted resin-impregnated twisted rope f2 before being input to the flat forming (heating, pressing, and curing) section 100B1 is preferably 0.8mm to 3.0mm (fig. 6 (a)). Therefore, in the twisted rope f1 to be supplied to the impregnation step, for example, when the reinforcing fiber is a carbon fiber, a carbon fiber twisted rope (carbon fiber bundle) f1 is used, in which 6000 to 60000(60K) carbon fibers (single fibers) f having a linear diameter of 6 to 10 μm are bundled together.

To explain further, the flat fiber-reinforced plastic twisted rope 2 manufactured by the manufacturing method according to the present embodiment is twisted at any one frequency in the range of 5 times to 30 times per meter (5 times/m to 30 times/m). Particularly, in the case of the twisted rope f2 having a large diameter of about 50K to 60K, it is difficult to secure a stable circular shape (circular shape) even if tension is applied before the resin is cured when the number of turns is less than 5, and it is difficult to form a flat shape when the number of turns exceeds 30, so that it is not preferable to exceed 30 turns/m. In particular, the twist is most preferably in the range of 10 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 twisted rope f1 is disposed at the inlet of the impregnation tank 17 as described above. In the dipping tank 17, a dipping roller 18 is disposed, and an outlet guide roller pair 19 is disposed at an outlet portion of the dipping tank 17.

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

The impregnation roller 18 functions to forcibly impregnate the twisted string f1 into the resin R, and is used in a state in which at least a part of the twisted string f1 is impregnated into the resin R stored in the impregnation tank 17.

The outlet guide roller pair 19(19a, 19b) functions to smooth out the twisted string f2 impregnated with the resin, and controls the amount of resin deposited thereon.

That is, the amount of the impregnated resin in the resin-impregnated twisted rope f2 is controlled by controlling the gap between the upper and lower rollers 19a, 19b and the pressing force.

In the present embodiment, the content (Vf) of the reinforcing fibers f in the resin-impregnated twisted string f2 is preferably 30% to 70% by volume of the reinforcing fibers.

Further, when the volume ratio (Vf) of the content of the reinforcing fibers is less than 30%, the amount of the fibers is small, and physical properties such as strength are deteriorated. On the other hand, if it exceeds 70%, the resin is insufficient, which also results in deterioration of physical properties such as strength of the produced wire rod. Therefore, the volume ratio of the reinforcing fibers is most preferably in the range of 40% to 60%.

In the manufacturing method of the present embodiment, carbon fibers are most preferably used as the reinforcing fibers as described above, but the present invention is not limited thereto, and one or more kinds of inorganic fibers such as carbon fibers, glass fibers, and basalt fibers, and organic fibers such as aramid fibers, PBO fibers, polyamide fibers, polyester fibers, and polyarylate fibers may be mixed and used.

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

The twisted rope f2 impregnated with resin is guided by the guide hole 21(21a, 21b) formed in the guide 20 and wound around the winding bobbin 22(22a, 22b) in the winding device 52. Fig. 6(a) shows a twisted rope f2 which has been twisted and impregnated with resin R.

The winding bobbins 22 are driven to rotate around the rotation shafts 23(23a, 23b), respectively.

The bobbin 22 around which the twisted rope f2 impregnated with resin is wound is fed to the retrieving section 100B3 through the steps of flat forming (heating, pressing, hardening) and heating, pressing, hardening, and cooling in the cooling sections 100B1 and 100B2 shown in fig. 3.

Heating, pressurizing, hardening and forming, cooling and recovering processes

Referring to fig. 3, in the heating, pressing, curing, and cooling sections (hereinafter, also referred to as "curing section") 100B1 and 100B2, the bobbins 22(22a, 22B) around which the resin-impregnated stranded cord f2 is wound by the winding device 52 are provided on the rotary shafts 24(24a, 24B) of the paying-off device 53. That is, the winding bobbin 22 functions as a pay-off bobbin in the heating, pressing, hardening, and cooling hardening steps.

The resin-impregnated and twisted uncured twisted string f2 wound around the pay-off bobbin 22(22a, 22b) is paid off by the bobbin 22. The twisted rope f2 passes through the form hardening device 40 while a predetermined tensile force is applied between the pay-off device 53 and the form hardening device 40 constituting the form hardening sections 100B1 and 100B2 and between the form hardening device 40 and a retrieval device 80 described later, and the flat fiber-reinforced plastic twisted rope 2 is formed. The flat fibre-reinforced plastic twisted rope 2 is then fed under tension towards the retrieval section 100B 3.

Further, the paying-off device 53 forming the hardened sections 100B1 and 100B2 functions as an electromagnetic brake or the like, and can apply an appropriate tensile force to the uncured resin impregnated stranded rope f2 paid off from the bobbin 22.

That is, between the pay-off device 53 and the form-hardening device 40, the twisted stranded rope f2 impregnated with uncured resin and twisted is uniformly tensioned with a suitable tension force, whereby the cross-sectional shape of the stranded rope f2 before being fed to the form-hardening sections 100B1 and 100B2 can be formed into a circular cross-section, that is, a circular shape (fig. 6 (B)).

In the present embodiment, when 6000 to 60000 carbon fiber twisted ropes are bundled as the carbon fiber bundle f1 as described above, it is preferable to apply a tensile force of 500 g/rope to 10 kg/rope to the twisted rope f2 impregnated with resin. If the amount of the carbon fiber is less than 500 g/root, it is difficult to secure a circular shape, and if the amount of the carbon fiber is more than 10 kg/root, a trouble such that the fiber f is broken during the production process occurs, which results in a problem that stable production cannot be achieved. The stretching force is particularly most preferably in the range of 2 kg/root to 8 kg/root.

In the present specification, "circular" means "substantially circular" including a ratio of a diameter in the longitudinal direction to a diameter in the transverse direction of a cross section in the range of 1.0 to 1.5.

According to the present embodiment, in the manufacturing apparatus 100 having the above-described configuration, the uncured resin-impregnated twisted string f2 twisted and unwound from the unwinding bobbin 22 is guided by the guide member 25 as necessary, and is continuously supplied to the heating, pressing and curing section 100B1 in a state of being arranged in parallel with a predetermined interval (P1) therebetween as shown in fig. 6 (B).

In the present embodiment, as described above, the heating, pressing, and hardening section 100B1 and the cooling section 100B2 are implemented by the forming and hardening apparatus 40 shown in fig. 3. In the present embodiment, the forming and curing device 40 is formed as upper and lower belt devices 40A and 40B which are arranged symmetrically in the vertical direction. The upper and lower belt devices 40A and 40B have the same configuration in the present embodiment, and therefore the upper belt device 40A will be described.

Referring to fig. 3 to 5(a) and 5(b), the banding device 40A includes: a belt main body 41A formed as a metal belt; a heating and pressing roller 42A that winds the belt main body 41A and rotationally moves the belt main body; the cooling roller 43A; and a pressure roller 44A. The belt body 41A is preferably an annular steel belt having a thickness t41 of 0.5 to 1.5 mm. In this example, a stainless steel strip having a thickness t41 of 1.0mm, a width w41 (see FIG. 5(a)) of 500mm and a circumferential length of 5530mm was used.

As shown in fig. 3 and 5(a), in the present embodiment, a cylindrical steel cylinder having an outer diameter D42 of 500mm and a roll length L42 of 600mm is used as the heating and pressing roll 42A, and an electric heater (not shown) as a heating source is provided inside the cylinder. The heating and pressing roller 42A is located in the heating, pressing, and hardening section 100B1, and heats and presses the belt main body 41A, which heats and presses the resin-impregnated twisted cord f2, to a predetermined temperature, for example, 130 to 180 ℃.

In this embodiment, the cooling roller 43A is made of the same steel cylinder as the heating and pressing roller 42A. That is, as shown in fig. 3 and 5b, a cylindrical steel cylinder having an outer diameter D43 of 500mm and a roll length L43 of 600mm is used, and a cooling system (cooling water piping, etc.) (not shown) is disposed inside the cylinder. The cooling roller 43A cools the belt main body 41A located in the cooling zone 100B2 to a predetermined temperature, for example, about 5 to 20 ℃.

In the belt device 40A configured as described above in this embodiment, the distance between the heating and pressing roller 42A and the cooling roller 43A, i.e., the distance L40 between the axes of rotation of the respective rollers, is 1980 mm.

According to the present embodiment, a plurality of (six in the present embodiment) pressure rollers 44A are arranged between the heating pressure roller 42A and the cooling roller 43A. In this embodiment, the diameter D44 of the pressure roller 44A is 85mm, and the roller length L44 (see FIG. 5(b)) is 600 mm. Of course, the pressure roller 44A is not limited to the shape and size configuration of the present embodiment. The pressure roller 44A may also be a heating pressure roller having a heat source.

As described above, in the present embodiment, the lower belt device 40B is configured similarly to the upper belt device 40A. Therefore, components of the lower belt device 40B having the same configuration and function as those of the upper belt device 40A are denoted by the same reference numerals as those of the lower belt device with the reference numeral "B", and detailed description thereof is omitted.

Here, the overall structure of the mold hardening apparatus 40 will be further described with reference to fig. 4, 5(a) and 5 (b).

The molding and hardening apparatus 40 is a frame for supporting the upper and lower belt apparatuses 40A, 40B which are symmetrically arranged in the vertical direction, and includes an upper frame 70A for supporting the upper belt apparatus 40A and a lower frame 70B for supporting the lower belt apparatus 40B.

The heating pressure roller 42A, the cooling roller 43A, and the pressure roller 44A of the upper belt device 40A are rotatably supported by the upper frame 70A, and the metal belt 41A is rotatably wound around these rollers 42A, 43A, and 44A. Similarly, the heating pressure roller 42B, the cooling roller 43B, and the pressure roller 44B of the lower belt device 40B are rotatably supported by the lower frame 70B, and the metal belt 41B is rotatably wound around the rollers 42B, 43B, and 44B.

According to the present embodiment, in the above configuration, the upper frame 70A is supported to be movable up and down on the lower frame 70B via, for example, the vertical interval adjustment members (lifting devices) 71(71a to 71d) as hydraulic devices. In the present embodiment, four lifting devices 71(71a to 71d) are arranged symmetrically on both sides of the upper and lower frames 70A, 70B holding the rollers 42(42A, 42B), 43(43A, 43B), 44(44A, 44B) of the belt devices 40A, 40B in a rotatable manner.

Therefore, the upper belt device 40A can move in the vertical direction with respect to the lower belt device 40B by driving the vertical distance adjustment members 71(71A to 71d), and the distance G41 (fig. 3) between the two metal belts 41A and 41B is set to a predetermined value.

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

Therefore, in the present embodiment, at least one, and usually 50 to 300 twisted rope f2 of the uncured twisted fat-impregnated twisted rope f2 is fed under tension between the pair of heated metal belts 41A, 41B that are rotated and moved relative to each other. Since the metal belts 41A and 41B are heated to a predetermined temperature by the heating and pressing rollers 42A and 42B, the resin-impregnated twisted rope f2 is sandwiched between the metal belts 41A and 41B and heated. Then, since the distance between the metal belts 41A and 41B is set to the predetermined distance G41 by the heating and pressing rollers 42A and 42B and the pressing rollers 44A and 44B, the resin-impregnated twisted rope f2 is pressed from both sides by the metal belts 41A and 41B, the cross-sectional shape of the twisted rope f2 is formed from a circular shape to a flat shape, the resin is hardened in the state of the shape, and the cooling rollers 43A and 43B cool the metal belts while maintaining the shape.

According to the present invention, since the resin-impregnated twisted rope f2 is twisted, it is also restrained in the width direction when the metal tape pressing part is formed flat, and therefore a flat twisted rope having a constant width can be manufactured.

In this manner, the resin-impregnated twisted cord f2 fed to the forming and curing device 40 of the belt devices 40A and 40B having the specific configurations described in the present embodiment is heated and pressed at a predetermined pressure and temperature in the heating, pressing and curing section 100B1 to be formed into a flat shape, and then cured to form the flat fiber-reinforced plastic twisted cord 2. In the present embodiment, in order to obtain the flat fiber-reinforced plastic twisted rope 2 having a desired thickness (t), as described above, the gap G41 between the belt main bodies 41A and 41B that sandwich the twisted rope f2 is appropriately adjusted by the upper and lower belt device gap adjustment members (lifting members) 71(71A to 71 d).

In general, the moving speed, heating, pressing, heating temperature and pressing force of the twisted rope f2 moving in the forming and hardening sections 100B1 and 100B2, and the cooling temperature of the hardening section 100B1 and the cooling section 100B2 are appropriately determined according to the kind of resin to be impregnated, the resin impregnation amount of the flat fiber-reinforced plastic twisted rope 2 as a product, and the like. By extending the lengths LB1 and LB2 of the heating, pressing, and hardening section 100B1 and the cooling section 100B2, the manufacturing speed of the flat fiber-reinforced plastic twisted rope 2 can be increased.

According to the manufacturing method of the present embodiment described above, as shown in fig. 6(a) and 6(B), a plurality of resin-impregnated twisted cords f2 having a circular cross section and arranged at a predetermined interval P1 are formed into a flat resin-uncured twisted cord 2s having a rectangular cross section in the heating, pressing and curing section 100B1 as shown in fig. 6 (c). The flat strands 2s are then hardened to form the flat fiber-reinforced plastic strands 2.

Next, the plurality of flat fiber-reinforced plastic strands 2 cooled in the cooling section 100B2 and peeled from the tapes 41A, 41B are fed to the retrieving section 100B3, passed through the strand surface grinding device 50, and wound on the reel 80. The strand surface grinding apparatus 50 is described in detail below.

In addition, the flat twisted cord 2s in an uncured state is bonded to the belt 41(41A, 41B) of the form-curing device 40, and in order to prevent the flat fiber-reinforced plastic twisted cord 2 in a cured state from being damaged when it is peeled off from the belt 41A, 41B satisfactorily, it is preferable that the outer surface of the belt 41A, 41B is maintained in a smooth state. Therefore, as shown in fig. 3, it is sufficient to provide polishing members 45(45A, 45B) such as polishing cloths, and to grind the surface of the metal strip by always or periodically abutting against them. Further, if necessary, a release agent application member 46(46A, 46B) may be provided together with the metal belt polishing member 45 or instead of the polishing member 45. By providing the release agent application member 46 and applying the release agent thinly on the belt surface, good peeling can be continued. The case of using the release agent is as follows.

The inventors of the present invention studied a mold release treatment using a coating layer of a fluorine-containing resin, a silicone resin, or the like on the surface of the metal tape, a teflon material ("teflon": trade name of polytetrafluoroethylene from dupont) on the surface of the metal, or the like, in order to prevent adhesion of the resin to the metal tape 41(41A, 41B). However, it was found that there are problems that: the surface layer obtained by these mold release treatments has a significantly lower hardness than that of the metal strip, and therefore, when the surface layer is produced by laminating hard materials such as a thermosetting fiber-reinforced plastic material, it is difficult to achieve thickness accuracy, and the surface layer is deformed or damaged after continuous use, and cannot withstand long-term continuous operation.

Therefore, as described above, in order to improve the releasability between the metal strip 41 and the resin of the resin-impregnated twisted rope f2, a release agent is thinly applied to the surface of the metal strip, and the release agent is sintered by heating the metal strip, thereby drawing the following conclusion:

(1) the resin adhering to the metal belt can be controlled to a minimum without using a release paper or a release film, and the surface of the formed flat fiber-reinforced plastic twisted rope 2 can be perfectly processed.

(2) Since the release agent is an extremely thin coating film, defects such as deformation or damage of the surface due to lack of flexibility, such as those of a teflon film, are not generated, and the hardness of the metal strip 41 is effectively utilized at the time of press forming, and a product having excellent thickness accuracy can be produced. And the number of the first and second electrodes,

(3) by applying the release agent periodically, the continuous production can be performed for a long period of time without recoating the surface due to a decrease in releasability. The release agent is preferably a fluorine-based release agent or a silicon-based release agent.

Further, when a release agent is applied to the surface of the metal tape, the release agent adheres to the surface of the molded flat fiber-reinforced plastic twisted rope 2, and therefore, there is a problem that a desired adhesive property cannot be obtained depending on the subsequent use method. Therefore, when the release agent is not used, as described above, it is conceivable to use release paper, a release film, a release layer (release cloth), or the like between the belt 41(41A, 41B) and the resin-impregnated twisted string f 2. However, when a secondary material such as release paper is used, there are problems such as material cost, facility cost, and disposal of the used secondary material.

Therefore, in the present embodiment, when the release agent is used as needed, the surface polishing device as the release agent removing member 50 is provided after the molding and curing device 40 as described above. The surface polishing device 50 is configured to lightly polish the upper and lower surfaces of the molded and hardened flat fiber-reinforced plastic strand 2 with sandpaper, a burr, or sand blasting. According to the experimental results, the following results are obtained: the release agent is removed from the strand surface by such a simple grinding device 50, and the ground irregularities improve the adhesion to the flat fiber-reinforced plastic strand without release agent by virtue of the anchoring effect. The release agent for removing the flat fiber-reinforced plastic strand may be used in a chemical cleaning apparatus using a solvent such as toluene, in addition to the surface polishing.

In addition, when the cross section of the fiber-reinforced plastic strand as a product is circular, curved surface grinding is required, and surface grinding becomes difficult. In contrast, in the present invention, the cross section of the fiber-reinforced plastic strand of the obtained product is a flat shape of a constant thickness twisted in the fiber, and therefore, by using sandpaper or the like of about #400 to #800 as described above, for example, continuous surface polishing can be easily performed.

As described above, the flat fiber-reinforced plastic strands 2 fed out from the form curing device 40 are wound at a predetermined speed by the winding reel 80 having a large diameter of 1m or more after the surface of each flat fiber-reinforced plastic strand 2 is ground by the surface grinding device 50 in the retrieval section 100B 3.

(method and apparatus for manufacturing Flat fiber-reinforced Plastic twisted rope sheet)

Next, a method for manufacturing the flat fiber-reinforced plastic twisted piece 1 will be described. Since the flat fiber-reinforced plastic twisted rope 2 used for manufacturing the flat fiber-reinforced plastic twisted rope piece 1 is manufactured by the same method as the method for manufacturing the flat fiber-reinforced plastic twisted rope 2 described with reference to fig. 1 to 3, the same manufacturing apparatus 100(100A, 100B) can be used. However, as shown in fig. 7, the retrieving section 100B3 of the flat forming, cooling and retrieving section 100B is different in that the flaking device 60 is disposed only after the surface grinding device 50.

That is, the manufacturing apparatus 100(100A, 100B) for manufacturing the flat fiber-reinforced plastic twisted string piece 1 according to the present invention is constituted by the fiber feeding, resin impregnation, winding section 100A (fig. 1) shown in fig. 1 and the flat forming (heating, pressing, hardening), cooling, and retrieving section 100B (100B1, 100B2, 100B3) shown in fig. 7.

According to the present embodiment, as described above, the resin-impregnated twisted string f2 subjected to the twisting process and the resin impregnation process is manufactured by the manufacturing apparatus 100 shown in fig. 1.

Next, the twisted rope f2 subjected to the twisting process and the resin impregnation process is subjected to the flat forming (heating, pressing, and hardening) and resin hardening of the twisted rope f2 in the flat forming (heating, pressing, and hardening) and cooling and retrieving section 100B of the manufacturing apparatus 100 shown in fig. 7, thereby manufacturing the flat fiber-reinforced plastic twisted rope 2, and then the flat fiber-reinforced plastic twisted rope piece 1.

Further, according to the present embodiment, as shown in fig. 7, the plurality of flat fiber-reinforced plastic strands 2 cooled and peeled from the tape in the heating, pressing, and hardening section 100B1 and the cooling section 100B2 are formed into a flat fiber-reinforced plastic strand sheet 1 by the surface polishing device 50 and the sheeting device 60, and are wound around the reel 80.

As described above, the surface of the flat fiber-reinforced plastic twisted rope 2 peeled from the heating, pressing, hardening, and cooling device 40 may have extremely high smoothness and a release agent may adhere thereto. When the surface smoothness of the flat fiber-reinforced plastic twisted rope 2 is high or when the release agent is adhered to the surface, it is not preferable to bond the flat fiber-reinforced plastic twisted rope piece 1 as a product to a structure as a reinforcing material or to use the flat fiber-reinforced plastic twisted rope piece as an FRP material for RTM molding.

Therefore, as described above, it is preferable to provide a release agent removing member such as the surface grinding device 50 at the outlet of the form curing device 40, roughen the surface of the flat fiber-reinforced plastic strand 2 from the form curing device 40, and remove the release agent from the surface of the flat fiber-reinforced plastic strand 2.

The surface of the flat fiber-reinforced plastic twisted rope 2 is roughened by the surface grinding device 50 to a desired roughness, and the release agent is removed therefrom, and the flat fiber-reinforced plastic twisted rope is fed to the flaking device 60 while being aligned in the longitudinal direction with a gap (g) therebetween, as shown in fig. 6 (c). Each flat fiber-reinforced plastic twisted rope 2 is formed into a flat fiber-reinforced plastic twisted rope piece 1 shown in fig. 9 by bonding a fixing member 3 to a piece-forming device 60. The sheet forming device 60 is provided with: a fixing part supply member 61 for supplying the fixing part 3; and a heating, bonding, cooling, and pressurizing member 62 for bonding the fixing member 3 to the flat fiber-reinforced plastic twisted rope 2 and integrating the plurality of flat fiber-reinforced plastic twisted ropes 2 into a sheet.

That is, in the present embodiment, the fixing member supplying means 61 supplies the fixing members 3 such as the weft yarns and the lattice-like members to both sides or one side of the aligned flat fiber-reinforced plastic twisted ropes 2 as described above, and then integrally forms the pressing means 62 by heating, bonding, and cooling.

According to the flat fiber-reinforced plastic twisted rope 2 and the method for manufacturing the flat fiber-reinforced plastic twisted rope piece 1 of the present invention described above, the following advantages are obtained.

In the manufacturing method of the present invention, the resin-impregnated twisted rope f2 formed into a circular shape by applying an appropriate tensile force to the twisted rope subjected to predetermined twisting and resin impregnation is sandwiched between the heated metal belts 41A and 41B and pressed, and a twisted rope having a large diameter of, for example, 50K can be used, and a large fiber basis weight and a thickness (t) of 1.0mm to 2mm (fiber basis weight of 900 g/m) can be manufactured efficiently, that is, with significantly improved molding efficiency²～1800g/m²And a flat fiber-reinforced plastic twisted piece 1 having a width (W) of 5mm to 500 mm. Further, according to the manufacturing method of the present embodiment, it is known that: the damage to the resin-impregnated twisted rope f2 was small, and there was substantially no disconnection during the manufacturing process. Therefore, the flat fiber-reinforced plastic twisted piece 1 of the present invention has a high strength and a high weight per unit area, has excellent deformability, can be applied to RTM molding, and can be used to produce a large molded body having a high strength.

Description of the reference numerals

1 Flat fiber reinforced plastic twisted rope piece

2 flat fiber reinforced plastic twisted rope

2s resin impregnated flat twisted rope

3 fixing parts

17 resin impregnation tank

40 (40A, 40B) Molding and hardening apparatus (heating, pressing, hardening and cooling apparatus)

41(41A, 41B) Metal Belt (Belt body)

42(42A, 42B) heating and pressure roller

43(43A, 43B) Cooling roll

44(44A, 44B) pressure roller

45 metal belt grinding member

50 strand surface grinding device (releasing agent removing member)

60-slice device

80 take-up reel

f reinforcing fiber monofilament

f1 reinforcing fibre bundle (stranded rope)

f2 resin impregnated unhardened stranded rope

R matrix resin

Claims (14)

1. A method for manufacturing a flat fiber-reinforced plastic twisted rope by using a form hardening device having an upper belt device and a lower belt device which are arranged symmetrically in the vertical direction, the method for manufacturing a flat fiber-reinforced plastic twisted rope being characterized in that,

the upper belt device and the lower belt device are both provided with:

a heating and pressing roller having a heating source inside;

a cooling roller having a cooling device therein;

a metal belt wound around and rotatably moving between the heating and pressing roll and the cooling roll;

a metal belt pressing roller disposed between the heating pressing roller and the cooling roller on an inner side of the metal belt that is rotationally moved; and

a vertical interval adjusting member for setting the interval between the two metal belts facing each other of the upper belt device and the lower belt device to a predetermined distance,

each of the metal belts of the upper belt device and the lower belt device is heated to a predetermined temperature by the heating and pressing roll heated by the heating source and is cooled to a predetermined temperature by the cooling roll cooled by the cooling device,

(a) feeding under tension a twisted resin-impregnated twisted rope containing a plurality of reinforcing fibers in an uncured state between a pair of heated metal strips that are moved in rotation relative to each other,

(b) the resin-impregnated twisted rope is sandwiched and heated by the metal belt heated by the heating and pressing roller, and the metal belt pressed by the heating and pressing roller and the metal belt pressing roller and set to a predetermined distance by the vertical interval adjusting member presses the resin-impregnated twisted rope from both sides of the resin-impregnated twisted rope, thereby forming the cross-sectional shape of the twisted rope into a flat shape, hardening the resin in the flat shape, and cooling the metal belt cooled by the cooling roller in the shape.

2. The method of manufacturing a flat fiber-reinforced plastic twisted rope according to claim 1, wherein the metal belt pressing roller has a heating source inside, and is heated to a prescribed temperature.

3. The method of manufacturing a flat fiber-reinforced plastic twisted rope according to claim 1 or 2, wherein the number of twists of the resin-impregnated twisted rope is 5 to 30 times/m.

4. The method of manufacturing a flat fiber-reinforced plastic ragger rope according to claim 1 or 2, characterized in that the resin-impregnated ragger rope is tensioned at a strength of 500 g/root to 10 kg/root.

5. The method of manufacturing a flat fiber-reinforced plastic strand according to claim 1 or 2, wherein a release agent is applied to the rotating metal belt at all times or periodically, and the release agent is sintered by heating the metal belt.

6. The method of manufacturing a flat fiber-reinforced plastic twisted rope according to claim 5, wherein the surface of the flat fiber-reinforced plastic twisted rope produced and separated from the metal belt and fed out in the step (b) is polished or washed with a solvent to remove a release agent adhering to the surface.

7. A method for manufacturing a flat fiber reinforced plastic twisted rope sheet is characterized in that,

(A) in a forming and hardening apparatus having an upper belt device and a lower belt device which are arranged symmetrically in the vertical direction,

the upper belt device and the lower belt device are both provided with:

a heating and pressing roller having a heating source inside;

a cooling roller having a cooling device therein;

a metal belt wound around and rotatably moving between the heating and pressing roll and the cooling roll;

a metal belt pressing roller disposed between the heating pressing roller and the cooling roller on an inner side of the metal belt that is rotationally moved; and

a vertical interval adjusting member for setting the interval between the two metal belts facing each other of the upper belt device and the lower belt device to a predetermined distance,

each of the metal belts of the upper belt device and the lower belt device is heated to a predetermined temperature by the heating and pressing roll heated by the heating source and is cooled to a predetermined temperature by the cooling roll cooled by the cooling device,

in the form-hardening apparatus described above, the press,

(a) a plurality of resin-impregnated twisted strands in an uncured state, each comprising a plurality of reinforcing fibers, are aligned in a planar manner while being doubled in one direction along the longitudinal direction of the strands, and are fed under tension between a pair of heated metal belts that are rotated while facing each other,

(b) heating the resin-impregnated twisted rope while sandwiching the metal belt heated by the heating and pressing roller, pressing the resin-impregnated twisted rope from both sides of the resin-impregnated twisted rope by the metal belt pressed by the heating and pressing roller and the metal belt pressing roller and set to a predetermined distance by the vertical interval adjusting member, forming the cross-sectional shape of the twisted rope into a flat shape, hardening the resin in the flat shape, and cooling the metal belt cooled by the cooling roller in the shape to produce a flat fiber-reinforced plastic twisted rope,

(B) then, the flat fiber-reinforced plastic strands aligned in a planar shape are integrally held by a fixing member and formed into a sheet shape.

8. The method of manufacturing a flat fiber-reinforced plastic twisted piece according to claim 7, wherein the metal tape pressing roller has a heating source inside and is heated to a predetermined temperature.

9. The method of manufacturing a flat fiber-reinforced plastic twisted rope sheet according to claim 7 or 8, wherein the number of twists of the resin-impregnated twisted rope is 5 to 30 twists/m.

10. The method of manufacturing a flat fiber-reinforced plastic twisted rope sheet according to claim 7 or 8, wherein the resin-impregnated twisted rope is tensioned at a strength of 500 g/piece to 10 kg/piece.

11. The method of manufacturing a flat fiber-reinforced plastic twisted piece according to claim 7 or 8, wherein a release agent is applied to the metal belt that is rotating while being moved at all times or periodically, and the release agent is sintered by heating the metal belt.

12. The method of manufacturing a flat fiber-reinforced plastic twisted rope sheet according to claim 11, wherein the step (B) is performed after the surface of the flat fiber-reinforced plastic twisted rope produced in the step (B) is polished or washed with a solvent to remove a release agent adhering to the surface.

13. The method of manufacturing a flat fiber-reinforced plastic twisted rope piece according to claim 7 or 8, wherein in the step (B), a predetermined gap (g) is formed in a longitudinal direction of the flat fiber-reinforced plastic twisted ropes aligned in a planar shape.

14. The method of manufacturing a flat fiber-reinforced plastic twisted piece according to claim 13, wherein the predetermined gap (g) is 0.1mm to 3.0 mm.