JP2012193482A - Fiber reinforced composite material and molded product thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber composite material which increases the elongation of a fabric sheet made of composite fiber thread in a molding process and improves its followability to a shape of any mold in the molding process and has high shaping property and enables the fiber reinforcement and to provide a molded product thereof.SOLUTION: A fiber reinforced composite material comprises a composite fiber yarn 1 with waviness which is formed by the rolled stitch of an engaging yarn 5 of a thermoplastic synthetic fiber yarn on a carbon fiber bundle 3 and/or a natural fiber yarn 4 with these yarns being subjected to varied tension. The composite fiber yarn 1 thus obtained is used as warp and/or weft to form a fabric sheet with a prescribed size. The fabric sheet thus obtained is heated to melt the synthetic fiber yarn therein so that the synthetic fiber yarn is integrally joined to the carbon fiber bundle and/or the natural fiber yarn, thereby forming the fiber reinforced composite material. A fiber reinforced composite mold is also obtained by molding the fiber reinforced composite material into a required curved surface shape.

Description

  The present invention relates to a fiber reinforced composite material in which a thermoplastic synthetic fiber yarn is wound around carbon fiber or natural fiber, and a molded body thereof, particularly in the field of fiber reinforcement.

  Thermosetting resins such as epoxy resins are mainly used for composite materials made of high-strength and high-modulus fibers such as carbon fibers, but in recent years due to features such as high toughness, recyclability, and mass productivity. Thermoplastic resin composite materials are attracting attention.

  However, a thermoplastic resin having a high resin viscosity has a low resin impregnation property to the reinforcing material, and a molding material that makes use of the strength of the fiber cannot be obtained unless it is sufficiently impregnated. For this purpose, various technical developments for improving the impregnation property of the resin have been carried out, but there are also various problems relating to the production cost, the impregnation property, and the control of the amount of adhered resin.

  In addition, there are woven fabrics, nonwoven fabrics, short fibers, and the like in the form of reinforcing fibers such as carbon fibers, but the woven fabric form in which the fibers are continuous is excellent in strength. However, a hard carbon fiber having almost no elongation is a woven fabric that is very difficult to weave.

  Accordingly, the present inventors have woven a composite fiber woven sheet from a composite fiber yarn produced using a sewing mechanism of an industrial sewing machine as disclosed in JP 2010-121250 A, and formed a fiber by hot press molding. A reinforced composite material and its composite molding were developed. As a result, it became possible to produce a material having high strength and high elastic modulus by improving the weaving property and improving the impregnation property of the resin. However, in the above method, it is practically possible to form a flat plate material, but it is difficult to form a molded product having a three-dimensional shape.

  On the other hand, molding of a fiber-reinforced composite material using a three-dimensional thermoplastic resin as a matrix is performed by injection molding. However, this method cannot form a material having high strength and high elastic modulus because the reinforcing fibers are discontinuous and it is difficult to increase the fiber content.

  Although it is desired to form a fabric-reinforced composite material having high strength, in the case of a fabric form, since the elongation is small, the followability to a curved mold is low and the formability is poor. For example, when a reinforced fabric of a single material and a resin sheet are laminated and molded with a curved mold, the stretch of the reinforced fabric is very small, making it difficult to form a three-dimensional shape and applying high pressure. This is also difficult, and there is a problem that the impregnation property of the resin is further lowered and the strength cannot be obtained.

  An object of the present invention is to develop a fiber composite material and a molded body thereof that can take advantage of the structural characteristics of yarns and woven fabrics to obtain a molded product having a required curved shape by reinforcing fibers.

  The present invention has been made in view of the above points, and in order to solve the above-mentioned problems, a carbon fiber bundle or / and a natural fiber yarn are bound with thermoplastic synthetic fiber yarns, and tension is applied to these yarns. A composite fiber yarn having a swell is formed by winding and staking and the woven fabric sheet of a predetermined size is woven using the composite fiber yarn having the swell and the swell as a warp and / or weft. It is an object of the present invention to provide a fiber-reinforced composite material characterized by heating a woven sheet to melt the synthetic fiber yarn and integrally joining the carbon fiber bundle or / and the natural fiber yarn.

  In addition, one or a plurality of bundles of carbon fiber bundles in which multifilaments are bundled and thermoplastic thermoplastic synthetic fiber yarns including polypropylene or polyester are drawn together to change the tension to change the binding yarn of the thermoplastic synthetic fiber yarns. The object of the present invention is to provide a fiber-reinforced composite material that is wound into a composite fiber thread.

  In addition, multiple synthetic fiber yarns, including cotton and linen, and thermoplastic synthetic fiber yarns, including polypropylene and polyester, are aligned to change the tension, and the synthetic yarns of thermoplastic synthetic yarn are wound together and combined. It is in providing the fiber reinforced composite material used as the fiber thread.

  Furthermore, another object of the present invention is to provide a fiber-reinforced composite material in which a composite fiber yarn is wound and sewed by changing the tension of a synthetic yarn of thermoplastic synthetic fiber at a pitch of 1 to 5 mm via a mellow sewing machine of a lock sewing machine.

  Furthermore, the present invention is to provide a fiber reinforced composite molded body in which the number of aligned yarns is increased, thick yarns are aligned, or the apparent thickness of the composite fiber yarn is increased by reducing the tension of the hook yarn. .

  Furthermore, another object of the present invention is to provide a fiber-reinforced composite molded body in which one or more woven sheets are laminated and compression-molded by a hot press to form a required curved surface shape.

  The fiber-reinforced composite material of the present invention is a composite fiber yarn in which a swell is formed by wrapping a carbon fiber bundle or / and a natural fiber yarn with a thermoplastic synthetic fiber yarn by changing the tension of these yarns and winding them together. A woven fabric sheet of a predetermined size is woven using the composite fiber yarn that has been sewed and provided with waviness as a warp and / or weft, and the synthetic fiber yarn is melted by heating the woven fabric sheet. By integrally bonding to a carbon fiber bundle or / and natural fiber yarn, a woven sheet in which a thermoplastic synthetic fiber yarn is melted and bonded to the carbon fiber bundle or / and natural fiber yarn in an impregnated state is obtained. It can be woven, and the swell of the composite fiber yarn can increase the elongation at the time of molding of the composite fabric, and it has high strength and toughness utilizing the structural characteristics of the yarn and fabric. Curved shape It can be molded to form articles.

  Also, one or more carbon fiber bundles bundled with multifilaments and thermoplastic synthetic fiber yarns containing polypropylene or polyester are aligned to change the tension, and the synthetic yarn yarns of thermoplastic synthetic yarns are wound together. By forming the composite fiber yarns, the aligned thermoplastic synthetic fiber yarns can be melt-bonded into the carbon fiber bundle in an impregnated state, and the structural features of the yarn and fabric are further utilized. Fiber reinforcement having high strength and toughness is peeled off, and a molded product having a required curved shape having high strength and high elastic modulus can be formed.

  Also, multiple synthetic fiber yarns including cotton and linen and thermoplastic synthetic fiber yarns containing polypropylene and polyester are drawn together to change the tension and wrap and sew the thermoplastic synthetic fiber yarns. By forming fiber bundle yarns, the aligned thermoplastic synthetic fiber yarns can be integrally melt-bonded to the natural fiber yarns in an impregnated state, and fiber reinforcement utilizing the structural characteristics of the yarns and fabrics is achieved. A molded product having a required curved shape having high strength and high elastic modulus can be formed.

  Furthermore, the synthetic fiber can be easily and quickly synthesized with the mellow sewing machine by wrapping the composite fiber yarn through the lock sewing machine mellow sewing machine at a pitch of 1 to 5 mm at a pitch of 1 to 5 mm by changing the tension of the synthetic synthetic yarn. A composite fiber yarn can be manufactured by wrapping and staking a yarn thread, and the resin content can be easily adjusted by changing the pitch of the thermoplastic synthetic fiber yarn. The fiber is reinforced by taking advantage of special characteristics, and a molded product having a required curved shape having high strength and high elastic modulus can be formed.

  Furthermore, the composite fiber yarns are greatly undulated by increasing the number of draw yarns, drawing thick yarns, and reducing the tension of the hook yarns to increase the apparent thickness of the composite fiber yarns. Therefore, the elongation at the time of forming the woven sheet can be increased, and a molded product having a required curved shape having high strength and high elastic modulus can be formed.

  Furthermore, by forming one or more woven sheets and compressing them with a hot press to form a required curved surface, the required large curvature utilizing the structural characteristics of the yarn and the woven fabric as described above. It is possible to obtain a fiber-reinforced composite molded body that can also be molded into a three-dimensional shape.

Figure for explaining the formation of a composite fiber yarn of one embodiment of the present invention, An enlarged photograph of the composite fiber yarn (a), a photograph of the woven state of the woven sheet (b), Enlarged photo (a) of other composite fiber yarn same as above, photo (b) of weaving state of the woven sheet The carbon fiber bundle same as above, a plan view (a) and a side view (b) of a composite fiber yarn loaded with a low tension on the natural fiber yarn and a low tension on the hooking yarn, Plane photo (a) and side photo (b) of carbon fiber bundles as above, composite fiber yarn loaded with low tension on natural fiber yarn and high tension on hook yarn Plane photo (a) and side photo (b) of carbon fiber bundles as above, composite fiber yarn loaded with high tension on natural fiber yarn and medium tension on hook yarn Side sectional view for explanation of upper mold and lower mold for heating and compressing the fabric-like sheet same as above, A photograph (a) of a molded product obtained by compression-molding the above woven sheet with a cavity mold having a radius of curvature of 15 mm and a photograph (b) for comparison. The photograph (a) of the molded product which compression-molded the fabric-like sheet | seat same as the above with the metal mold | die of a cavity with a curvature radius of 150 mm, and the photograph (b) of the comparison. A photograph (a) of a molded product obtained by compression-molding the same three-layered woven sheet with a mold having a cavity with a radius of curvature of 150 mm, and a photograph (b) for comparison. A photograph (a) of a molded product obtained by compressing a three-layer laminated woven sheet with a mold having a cavity with a radius of curvature of 25 mm, and a photograph (b) for comparison. The photograph (a) of the molded product which compression-molded the fabric-like sheet | seat which laminated | stacked three layers same as the above with the metal mold | die of a cavity with a curvature radius of 15 mm, and the photograph (b) of the comparison.

  The fiber-reinforced composite material of the present invention and the composite molded body thereof are produced by wrapping a carbon fiber bundle or / and natural fiber yarn with a thermoplastic synthetic fiber yarn and changing the tension to these yarns by winding and sewing. The above-mentioned synthetic fiber is formed by weaving a woven fabric sheet of a predetermined size using the composite fiber yarn formed as a warp and / or weft as a composite fiber yarn formed by sewing and winding it It is characterized in that the yarn is melted and integrally joined to a carbon fiber bundle or / and a natural fiber yarn.

  The composite fiber yarn 1 includes one or more bundles of carbon fiber bundles 3 and / or one or more of natural fiber yarns 4 in which multifilaments are bundled using a mellow sewing machine 2 of overlock or lock sewing machine as shown in FIG. The book is supplied to the mellow sewing machine 2 with these tensions changed, and the carbon fiber bundle 3 and / or the natural fiber thread 4 is sewed with the synthetic synthetic yarn thread 5 by changing the tension as necessary. To form.

  The carbon fiber bundle 3 in which multifilaments are bundled can use PAN-based carbon fibers of polyacrylonitrile or pitch-based carbon fibers of petroleum pitch, and the PAN system has excellent characteristics as a composite material using a resin as a matrix. Especially suitable for lightweight structure. The filaments of the carbon fiber bundle 3 are extremely thin with a diameter of about 7 to 10 μm, and these filaments are bundled in a range of 1000 to 12000 as described above. The thickness is about several mm to 1 mm, and a sizing process is performed to coat a small amount of resin in order to prevent the occurrence of fluff.

  The carbon fiber bundle 3 can be wound around the hook yarn 5 in a predetermined amount such as one bundle, but the hook yarn 5 is wound around the plurality of bundles such as 3 to 7 bundles, preferably 3 to 5 bundles. However, the composite fiber bundle yarn 1 can be made thick or bulky. The carbon fiber bundle 3 can be arranged in a single bundle or a three-core shape, and in an axially symmetrical double or triple shape on these outer peripheral portions. Also, a plurality of thermoplastic synthetic fiber yarns 6 including polypropylene or polyester having a predetermined diameter can be inserted into the carbon fiber bundle 3 in an aligned manner or a random manner, such as 3 to 10 pieces.

  The natural fiber yarn 4 is environmentally friendly and uses natural fibers including cotton, hemp, and hair, and the hook yarn 5 can be wound and wound one by one. The hook thread 5 can be wound and hooked for each of the plurality. As with the carbon fiber bundle 3, the natural fiber yarns 4 can also be arranged in a single or three-core shape, and in an axially symmetrical double or triple shape on these outer peripheral portions. In addition, a plurality of thermoplastic synthetic fiber yarns 6 including polypropylene or polyester having a predetermined diameter can be inserted into the natural fiber yarns 4 in an aligned or random manner. If necessary, the carbon fiber bundle 3 and the natural fiber yarn 4 can be inserted together. As the thermoplastic synthetic fiber yarn 6 to be drawn and inserted, polypropylene is preferable because it is inexpensive and can be easily melted by heating.

  As the hooking yarn 5, a thermoplastic synthetic fiber yarn including polypropylene, polyester, polyethylene, and polyamide can be used, and an extra fine material of 0.1 to 10 denier can be hooked without being bulky, so that it becomes a honey fabric. Although it can be formed, if the carbon fiber bundle 3 is thick or bulky, a thread having an appropriate thickness of 100 to 240 denier can be used if necessary. The hook yarn 5 is preferably supplied to the mellow sewing machine 2 and engaged with the carbon fiber bundle 3 or the natural fiber yarn 4 at a pitch of 1 to 5 mm, and the carbon fiber bundle 3 or the natural fiber yarn 4 is dispersed. It is preferable because it can effectively prevent fluffing, fluffing and peeling. In particular, the resin content can be easily adjusted by changing the winding pitch of the hooking yarn 5 of the thermoplastic synthetic fiber yarn, and the fiber having a predetermined resin content utilizing the structural characteristics of the yarn and the fabric. A fiber-reinforced composite material that can be reinforced can be obtained.

  The composite fiber yarn 1 is produced by a sewing mechanism of a mellow sewing machine 2 as shown in FIG. Each thread is compounded into one composite thread at the sewing location, but by appropriately adjusting the tension of the carbon fiber bundle 3, the natural fiber thread 4, the aligned synthetic fiber thread 6, and the hooking thread 5, The composite fiber yarn 1 in which the carbon fiber bundle 3, the natural fiber yarn 4, and the aligned synthetic fiber yarn 6 are undulated can be produced. And by using the fabric-like sheet 7 produced from the composite fiber yarn 1 provided with this undulation, large deformation becomes easy, and a molded product having a curved surface shape with a large curvature can be produced from a small curvature. The carbon fiber bundle 3 and the natural fiber thread 4 have low tension, the hooking thread 5 has low tension, the carbon fiber bundle 3 and the natural fiber thread 4 have low tension, the hooking thread 5 has high tension, and the carbon fiber bundle 3 By changing the tension as appropriate according to the molded product, such as high tension for the reinforcing fiber of the natural fiber thread 4 and medium tension for the hooking thread 5, the undulation of the thread is changed as shown in FIGS. 4 to 6. It can be changed as required. By increasing the waviness of the yarn, it is possible to increase the elongation at the time of forming the composite fabric, and to produce a three-dimensional shaped product with a required curvature.

  In addition, the composite fiber yarn 1 has an apparent thickness as a structure in which a plurality of synthetic fiber yarns 6 of reinforced fibers of carbon fiber bundles 3 and natural fiber yarns 4 and aligned yarns that are resin yarns are covered with hook yarns 5. It is possible to increase the waviness of the composite fiber yarn 1 in the woven fabric. As a result, it is possible to increase the elongation at the time of forming the woven fabric sheet 7 and to manufacture a molded product having a desired shape with a large curvature. For example, it is possible to increase the number of draw yarns, to make a composite fiber yarn 1 by drawing up yarns having a large diameter, or to reduce the tension of the hook yarn 5.

  The composite fiber yarn 1 provided with swells by winding and sewing as described above is used for warp and / or weft to form a woven sheet 7 as shown in FIGS. Weaving a woven fabric sheet 7 of a predetermined size to prevent looseness, fluff and peeling, and to give elasticity to the carbon fiber bundle 3 having almost no elasticity, and warp breakage , Weaving can be improved without breaking the weft.

  The carbon fiber bundle 3 and the natural fiber yarn 4 may be one bundle or one or more. However, by using a plurality of the carbon fiber bundles 4 as described above, a predetermined bulky one can be obtained quickly and easily, and the strength is increased. . In particular, it is preferable to align the thermoplastic synthetic fiber yarn 6 such as polypropylene or polyester with the carbon fiber bundle 3 or the natural fiber yarn 4 in order to increase the strength. In addition, the carbon fiber bundle 3, the natural fiber yarn 4, and the thermoplastic synthetic fiber yarn 6 can have an appropriate thickness and an appropriate number depending on the object within the scope of the present invention.

  As shown in FIG. 1, the above-described hooking yarn 5 includes a lock sewing machine mellow sewing machine 2 and one or more bundles of carbon fiber bundles 3 and / or one or more bundles of natural fiber yarns 4 and heat such as polypropylene. The plastic synthetic fiber yarn 6 is aligned and supplied to the mellow sewing machine 2 at the same time, and the thermoplastic synthetic fiber yarn such as polypropylene of the sewing needle 10 that moves up and down is moved to the needle yarn 11 of the thermoplastic synthetic fiber yarn such as polypropylene. The composite fiber bundle yarn 1 can be obtained by stitching the upper yarn 12 and the lower yarn 13 of the synthetic fiber yarn and then winding them.

  The woven sheet 7 woven into a predetermined size such as plain weave in this way is loaded into a mold 15 provided with a cavity 14 having a predetermined curvature and having a predetermined curvature as shown in FIG. When the plastic synthetic resin sheet is not coated or required, and heated to a predetermined temperature of 180 to 230 ° C. and compression-molded with a hot press, the thermoplastic synthetic fiber yarns 5, 6, 11, 12, 13 are formed. It can be melted and bonded to the carbon fiber bundle 3 or / and the natural fiber yarn 4 in an impregnated state, and fiber reinforcement is applied taking advantage of the structural characteristics of the yarn and the fabric. The degree can be increased, and a molded product having a required curved shape having high strength and high elastic modulus can be formed.

  Further, one or more bundles of carbon fiber bundles 3 and / or one or more of natural fiber yarns 4 and thermoplastic synthetic fiber yarns 6 are aligned to wind a hook yarn 5 of a thermoplastic synthetic fiber yarn. By forming the composite fiber yarn 1 by sewing, the aligned thermoplastic synthetic fiber yarn 6 can be integrally melt-bonded into the carbon fiber bundle 3 and / or the natural fiber yarn 4 in an impregnated state, thereby reinforcing the fiber. It is possible to obtain a fiber-reinforced composite material that can be peeled off.

  In this way, it is possible to supply a woven sheet 7 such as a plain weave to a mold having a required cavity and compress it with a hot press to easily form a required curved surface having a large curvature and a required three-dimensional shape. it can. When natural fiber yarns such as those containing cotton or hemp are used, a fiber-reinforced composite material that is easy to recycle and is easy to recycle can be obtained.

  FIG. 8 shows an embodiment of the present invention. As shown in FIG. 1, the tension of the natural fiber yarn 4 of the cotton yarn in which multifilaments are bundled is lowered, and the tension of the thermoplastic hooking yarn 5 of polypropylene is increased. Then, the natural fiber yarn 4 is aligned and supplied to the mellow sewing machine 2 so as to generate a large undulation, the mellow sewing machine 2 is driven, the sewing needle 10 is swung, and the needle thread of the synthetic fiber of polypropylene thermoplastic fiber yarn is raised and lowered 11 is hooked onto a similar synthetic yarn hook yarn 5 at a pitch of 2 mm via upper yarn 12 and lower yarn 13 of a polypropylene thermoplastic fiber yarn to form a composite fiber bundle yarn 1, and warp yarn 8 and Supplied as weft 9 and woven into a predetermined size as a flat knitting. FIG. 2 is a woven fabric sheet 7 woven with the composite fiber yarn 1 that has produced the large swell.

  As shown in the figure, the hooking yarn 5 not only prevents the carbon fiber bundle 3 from flaking and prevents fluffing and peeling, but also the elasticity of the hooking yarn 5 that is made of a carbon fiber yarn that is almost non-stretchable and looped. Can be granted. As a result, weaving properties can be greatly improved without causing warp breakage and weft breakage. Further, when the hook yarn 5 is wound and wound, the carbon fiber bundle 3 can be wound without being twisted, so that the single carbon fiber yarn that is extremely thin and easy to break can be wound without being cut. Thus, it is possible to prevent the strength of the composite fiber bundle yarn 1 from being lowered.

  In this way, three woven sheets 7 woven into a predetermined size such as plain weave are stacked, and loaded into a mold 15 provided with a cavity 14 of a hemispherical curvature surface having a curvature radius of 15 mm as shown in FIG. A 0.2 mm layer polypropylene synthetic resin sheet was coated, heated to approximately 190 ° C., and pressed with a heating press at a pressure of 3 MPa for 7 minutes to form a fiber-reinforced composite molded article. As shown in FIG. 8 (a), this embodiment did not show any disturbance or cutting of the hemispherical surface or the surrounding yarn, and was able to be molded uniformly and cleanly.

  On the other hand, it can be seen that the comparative product in which the woven fabric and the resin sheet are laminated changes the arrangement of the hemispherical cotton yarns as shown in FIG. 8B and the surrounding yarns are cut. It can be seen that even a cotton fabric having a relatively high degree of elongation is difficult to be formed into a curved shape when the shape has a large curvature.

  FIG. 9 shows another embodiment of the present invention, which is formed by a mold having a small curvature radius of 150 mm. The number of stacked layers and the molding conditions are the same as described above. The molded product is shown in FIGS. 9 (a) and 9 (b). Since the curvature is small, neither yarn disturbance nor cutting is observed. However, FIG. 9B, which is a comparative product in which sheets are laminated, was deformed by a small compressive load with low strength because of insufficient resin impregnation. In FIG. 9A of the present product, since the resin fibers are present inside, a molded product having high strength can be uniformly formed even at a low pressure.

  FIGS. 10 to 12 show still other embodiments of the present invention. 3K carbon fiber (HTA-3K; manufactured by Toho Tenax Co., Ltd.) polypropylene monofilament 300D (Marusan Chemical Industry) produced according to the present invention. A woven fabric sheet produced using a composite fiber yarn made by Co., Ltd. was laminated and formed into a three-dimensional shape. As for the composite fiber yarn by this implementation product, a wave | undulation can be confirmed to carbon fiber. Moreover, the density of the woven fabric sheet produced from the composite fiber yarn is 12 warps / inch, 11 wefts / inch, and the structure is plain weave. As the molding shape, in addition to the mold shown in FIG. 7, a hemispherical mold having a curvature therebetween was also molded.

  Three of the above-mentioned woven sheets were laminated and hot press molded using three types of dies having different curvatures. The molding conditions are a temperature of 190 ° C., a pressure of 3 MPa, and a time of 7 minutes. In addition, as a comparative sample, three carbon fiber fabrics (Pyrofil cloth TR3110M; manufactured by Mitsubishi Rayon Co., Ltd.) and four PP resin sheets (thickness 0.2 mm) were alternately stacked and produced under the same molding conditions.

  FIG. 10 shows a molding with a mold having a curvature radius of 150 mm. According to the present invention, the surface of this product was a shape in which the mold shape was almost transferred, although small irregularities were seen as shown in FIG. Further, since the resin is melted and solidified inside, the strength is high. However, in the comparative product, as shown in FIG. 10B, the unimpregnated portion of the resin was entirely seen, and large dents were confirmed in several places.

  FIG. 11 shows a molding with a mold having a curvature radius of 25 mm. As shown in FIG. 11 (a), this embodiment product can be molded neatly without any disturbance of the fabric structure. On the other hand, as shown in FIG. 11B, the comparative product has an unimpregnated portion of the resin on the entire surface and has a large dent. Moreover, the cutting | disconnection of the carbon fiber bundle was also seen.

  FIG. 12 shows a mold having a curvature radius of 15 mm and a large curvature. As shown in FIG. 12A, this embodiment product can be molded neatly without any disturbance of the fabric structure. On the other hand, as shown in FIG. 12B, the comparative product has an unimpregnated portion of the resin on the entire surface, and the whitish region is a portion where the yarn is completely cut and no carbon fiber bundle is present, and only the resin is present. There is a situation where there is a hole.

  As described above, according to the present invention, it is possible to easily and neatly form a curved material that could not be formed due to a reinforced fabric form. In particular, not only the curvature radius of 150 mm or less, but also 50 mm or less, and even 15 mm or less can be sufficiently formed. Moreover, it becomes a material with high strength and appearance from the impregnation of resin, and when it is laminated in multiple layers, it can be protected against bistle and rifle guns.

  The present invention can be used in place of conventional metal molded products, and in the same way as FRP and CFRP, the body and parts of automobiles, the body and parts of boats and yachts, the body and parts of trains, and the sports field. Tennis rackets, golf club shafts, heads, skis, snow boats, helmets for daily use, safety shoes, attache cases, cases and parts such as personal computers and mobile phones in the OA field, civil engineering, reinforcement materials in the building field, TV, medical It can be widely used in equipment, laser devices, military helmets and bulletproof vests, and other items that require light weight and high strength.

DESCRIPTION OF SYMBOLS 1 ... Composite fiber yarn 2 ... Melo sewing machine 3 ... Carbon fiber bundle 4 ... Natural fiber yarn 5 ... Hanging yarn 6 ... Synthetic fiber yarn 7 ... Textile sheet

JP 2010-121250 A

Claims (6)

  Carbon fiber bundles and / or natural fiber yarns are combined with thermoplastic synthetic fiber yarns to form composite fiber yarns with swells by changing the tension of these yarns to form a composite fiber yarn. A woven fabric sheet of a predetermined size is woven using the composite fiber yarn provided with waviness as a warp and / or weft, the fabric sheet is heated to melt the synthetic fiber yarn, and the carbon fiber bundle or / and the natural fiber yarn A fiber-reinforced composite material characterized by being integrally bonded to the fiber.   One or more bundles of carbon fiber bundles bundled with multifilaments and thermoplastic thermoplastic synthetic fiber yarns including polypropylene and polyester are drawn together to change the tension, and then the synthetic synthetic yarn yarns are wound together. The fiber reinforced composite material according to claim 1, wherein the fiber reinforced composite material is formed into a composite fiber yarn by being hooked.   Two or more natural fiber yarns including cotton and hemp are combined with thermoplastic synthetic fiber yarns including polypropylene and polyester, and tension is changed to wrap and sew thermoplastic synthetic fiber yarns to form composite fiber yarns. The fiber-reinforced composite material according to claim 1.   The fiber reinforced fiber according to any one of claims 1 to 3, wherein the composite fiber yarn is wound and sewed through a lock sewing machine mellow sewing machine at a pitch of 1 to 5 mm while changing the tension of the thermoplastic synthetic fiber yarn by changing the tension. Composite material.   The fiber reinforcement according to any one of claims 1 to 4, wherein the apparent thickness of the composite fiber yarn is increased by increasing the number of draw yarns, aligning thick yarns, or reducing the tension of the hook yarns. Composite molded body.   The fiber-reinforced composite molded article according to any one of claims 1 to 5, wherein one or more woven sheets are laminated and compression-molded with a hot press to form a required curved shape.