JP2012188786A - Unidirectional woven fabric and method for producing the same, and fiber-reinforced plastic molded article using the unidirectional woven fabric and molding method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a woven fabric in which crimps of carbon fiber yarns arranged as warp yarns are reduced as compared to a conventional unidirectional carbon fiber woven fabric, and the straightness of the carbon fiber yarns is retained.SOLUTION: A woven fabric F is formed such that weft yarns have a fineness of 110-660 dtex and a weft yarn density is 1.2-3.9 yarns/cm. Both surfaces of the woven fabric F are heated at a temperature equal to or higher than the melting point of the weft yarns, and are compression-bonded so that the warp yarns are thermally fusion-bonded to each other. The compression bonding of both surfaces is performed by a pair of heating rollers 21 and 22 so as to provide an adhesive strength between the warp and weft yarns of 1.5 N or greater.

Description

  The present invention relates to a unidirectional fabric using carbon fiber yarns for warp and a method for producing the same, a fiber reinforced plastic molded product using the unidirectional fabric as a base material, and a method for forming the same.

  Conventionally, it has been well known to use fiber sheets that have been sealed for the purpose of reinforcing and repairing various concrete structures such as bridges, tunnels, and buildings, but most of them use reinforcing fibers for warps. A woven unidirectional woven fabric. For example, in Japanese Patent No. 3279256 (Patent Document 1) and Japanese Patent Laid-Open No. 10-317247 (Patent Document 2), a woven fabric in which carbon fibers are arranged in one direction is a fiber sheet. It is a representative one. Looking at these woven structures, auxiliary yarns such as glass fibers are used as wefts. In Patent Document 2, a method is adopted in which heat-bonding fibers are arranged on the auxiliary yarn, and the warp yarns are bonded to each other by weft by heat-bonding the heat-bonding fibers. However, even if these fabrics use flat yarns for the warp and the weft, crimps are forced to occur at the intersection of the warp and the weft, and the mechanical properties such as tensile strength and compressive strength make the carbon fiber unidirectional. Compared with the prepregs that are arranged in the resin and impregnated with the resin, it is difficult to enter the field where mechanical properties such as compressive strength such as automobiles and windmill materials are required for industrial use.

  Further, for example, in Japanese Patent Application Laid-Open No. 09-067943 (Patent Document 3), carbon fiber, glass fiber, aramid fiber or the like is used as the warp, and a thermoplastic resin such as polyamide fiber, polyethylene fiber or polyester fiber is used for the weft. It is disclosed that fibers are used and the warp yarns are bonded together by thermal fusion with the thermoplastic resin fibers. Similarly to the unidirectional woven fabric disclosed in Patent Document 1, the woven fabric does not come loose even if it is cut in accordance with the shape of the concrete structure, and the handling of the woven fabric is hindered. It is not. Therefore, since a film is not formed between the warp yarns when the thermoplastic resin fibers are fused, the weft yarns are fused to the warp yarns without any special pressurization during heat fusion. It takes a lot of work to adjust the amount of thermoplastic resin fiber used and its fusing temperature.

Japanese Patent No. 3279256 Japanese Patent Laid-Open No. 10-317247 JP 09-067943 A

  Although the use of the unidirectional fabric as the reinforcing fiber substrate has several advantages as described above, the reinforcing substrate disclosed in Patent Document 1 is a unidirectional fabric, but the structure of the fabric. In the case where rigid glass fibers are arranged on the weft, a woven fabric is formed by crossing the warp and the weft. At this time, the carbon fibers arranged in the warp are crimped at the time of crossing with the weft. For this reason, it is already widely known that the crimp causes stress to concentrate, resulting in a decrease in strength properties as a reinforced fiber fabric, particularly a decrease in tensile strength and compression strength.

On the other hand, even in the same unidirectional woven fabric, the woven fabric disclosed in Patent Document 2 uses a yarn made of only thermoplastic resin fibers as a weft. Therefore, it is possible to avoid the stiffness of the weft, but as described above, the thermoplastic resin is easily formed into a film at the time of fusion, so that the resin can be evenly distributed throughout the fiber woven fabric in the subsequent impregnation of the matrix resin. Is difficult. Moreover, according to Patent Document 2, since no special measures are taken except for heating at the time of fusion of the weft yarns, there is no guarantee that crimps are not reliably formed on the warp yarns.

  In any case, the unidirectional fabrics disclosed in Patent Documents 1 and 2 are all fabrics for use as a reinforcing material for concrete structures, and these carbon fiber fabrics have compressive strength and the like. Since it is greatly reduced, the present situation is that the development of other applications has not been realized due to insufficient strength in industrial applications that require compressive strength as a composite material.

  The present invention provides a woven fabric in which crimping of carbon fiber yarns arranged in warp is reduced and the straightness of carbon fiber yarns is maintained, compared to conventional unidirectional carbon fiber fabrics. That is the purpose.

  The above object is a first basic configuration of the present invention, which is a method for manufacturing a woven fabric in which a plurality of carbon fiber yarns are arranged in the warp direction, and a weft yarn orthogonal to the warp yarns is woven using thermoplastic resin fiber yarns. The both sides of the woven fabric composed of the wefts having a fineness of 110 to 660 dtex and a weft density of 1.2 to 3.9 yarns / cm are heated at a temperature equal to or higher than the melting point of the wefts to heat-bond the warp yarns. This is achieved by a method for producing a unidirectional fabric to be worn and a unidirectional fabric obtained by the production method. At this time, the adhesive strength between the warp and the weft in the unidirectional woven fabric needs to be 1.5 N or more.

  The above object is a second basic configuration of the present invention, in which a woven fabric in which carbon fiber yarns are arranged in the warp and a thermoplastic resin fiber yarn is used in the weft is woven on both sides of the fabric in a separate step. It can also be achieved by a method for producing a unidirectional woven fabric in which the woven fabric is integrally held by pressing both sides with a heating roll having a temperature equal to or higher than the melting point of the weft.

  The fiber-reinforced plastic molded article using the unidirectional fabric preferably uses a laminate of at least one layer of the unidirectional fabric as a fiber base material, and the molding method uses the unidirectional fabric as a fiber. Laminate at least one layer as a base material on a mold, cover the entire fiber base material with a bag film, then place the inside covered with the bag film in a vacuum state, and perpendicular to the fiber axis of the laminated fiber base material It is preferable to employ a molding method in which a room temperature curable resin is injected and diffused from one side of the direction, and the fiber base material is impregnated with the room temperature curable resin.

  In the unidirectional woven fabric manufactured by the manufacturing method of the present invention, the weft yarn is composed of only the heat-sealing resin fiber yarn, and further, the crimping of the carbon fiber yarn which is the warp yarn is formed by applying adhesion by surface pressure bonding. This reduces the composite physical properties of the molded product, which is a processed product, and enables development in various industrial fields. In particular, when the crimping is performed with a pair of heating rolls, not only the crimping surface can be continuously and uniformly heat-bonded, but warps and wefts composed of a large number of filaments, particularly at the crossing portion. Since the surface is pressure-bonded, the fineness of the weft is set to 110 to 660 dtex, and the density of the weft is set to 1.2 to 3.9 yarns / cm. At the same time, the stress at the intersection is dispersed to further improve the physical properties of the composite.

It is an imaging which shows the plane of the unidirectional textile fabric of this invention. It is an imaging which shows the plane of the conventional unidirectional fabric. It is process explanatory drawing which shows the outline | summary of the weaving process of this invention fabric. It is process explanatory drawing which shows the outline of the heating surface pressure bonding method of this invention textile fabric. It is a side view which shows the schematic block diagram of a vacuum impregnation molding method (VaRTM).

Hereinafter, the present invention will be described in detail based on representative embodiments with reference to the drawings.
As in Patent Document 2, a conventional general unidirectional fabric uses glass fibers or aramid fibers as the weft yarn as the core yarn, melts the low melting point added yarn added to the core yarn, It is heat-sealed. For this reason, it has been widely known that stress is concentrated at the crossing portion due to crimping of the weft and the warp to cause a decrease in strength such as compressive strength. Therefore, the present inventors do not use glass fibers and do surface bonding after weaving, as in the case of Patent Document 3, so that stress is not concentrated due to crimping at the intersection of the weft and warp. A method for producing a directional fabric is proposed, which will be described in detail with reference to the drawings.

  The conventional unidirectional woven fabric shown in FIG. 2 is often used for earthwork applications such as seismic reinforcement, and concrete is repaired directly using the woven fabric and matrix resin in the field work. For this reason, in particular, a fabric with good handleability is obtained in which the intersections between the warp yarn Wa and the weft yarn We are provided and the carbon fiber yarns are not easily scattered. In order to maintain the strength here, glass fibers or the like are generally used as auxiliary fibers as the weft yarns, as described above, and adhesion to the warp yarns Wa is performed by attaching the heat fusion fibers to the warp yarns Wa. Let The heat-bonding fiber referred to here is a thermoplastic resin fiber yarn referred to in the present invention, and is not limited as long as it is a low-melting fiber such as polyester, nylon, or polypropylene.

  An important factor among mechanical properties for civil engineering is tensile strength, and its specifications are determined by a measurement method based on JIS standards, but the value is almost determined by the performance of the carbon fiber yarn. However, in reality, the compressive strength of the unidirectional fabric described above is significantly reduced, compared to the compressive strength of a prepreg impregnated with a resin in which carbon fiber yarns are arranged in one direction without interposing a weft. The strength expression is very low, and it is considered difficult to use due to insufficient strength for industrial applications that require strong mechanical properties such as wind turbines of wind power generators. In order to solve these problems, we first examined how to reduce the crimp of carbon fiber yarns arranged as warps. Auxiliary fibers such as these were used, and thermoplastic resin fiber yarns were added to bond the thermoplastic resin fiber yarns to the warp yarns. Naturally, since glass fibers and the like are rigid, the carbon fiber yarns arranged as warps Wa of the fabric woven in plain weave are inevitably crimped and further warped by the crossing with the wefts We. The aligned carbon fiber yarns were bulged in the warp and weft directions at the intersection, and the straightness was impaired.

  Without using the glass fiber that is the cause of the crimp, the weft is composed only of the resin fiber yarn, and the resin fiber yarn is simply fused with a hot roll on a loom using the same manufacturing method as a conventional unidirectional fabric. However, the adhesion with the warp was insufficient, and the subsequent handling was difficult. This is because the resin fiber yarn on the fabric surface that is in direct contact with the heat roll is transferred to the heat roll, and only the non-contact surface with the heat roll is bonded to the warp. This is to make it impossible to maintain the shape of the fabric. In addition, the resin fiber yarn on the surface side not in direct contact with the heat roll also has a large variation in the degree of fusion due to the temperature change of the heat roll, so when contacting the heat roll at a high temperature, in the weft direction. A portion where the resin fiber yarn does not exist is generated along the line. This is due to heat shrinkage of the resin fiber yarn. On the other hand, it is difficult to control the temperature by heat fusion by this method in which a hot roll is simply brought into contact, and productivity is lacking.

Therefore, the present inventors have continued further studies. As another fusing method, at least a heated metal roller heated to a predetermined temperature is pressure-bonded from one surface of the woven fabric and subjected to pressure-bonding processing at the intersection of the warp and the weft. I found out that the temperature control is easy and the heat fusion is surely performed. Furthermore, when a pair of metal heating rollers are pressed from both sides of the fabric, a large number of constituent fibers of the warp and the weft are spread in the width direction even at the intersection of the weft consisting of a large number of filaments with the warp, as shown in FIG. In addition, not only the height of the crimp is reduced while the crossing portion is flattened, but also the peripheral portion thereof is flattened, and at the same time, stress in the crossing portion is dispersed, so that subsequent composite strength can be secured. found.

  It has been found that a unidirectional fabric as shown in FIG. 1 can be obtained. The woven fabric is preferably formed by arranging carbon fiber yarns as warp yarns 1 and forming weft structures of weft yarns with thermoplastic resin fiber yarns in a plain weave structure. The warp 1 and the weft 2 are joined by a pair of metal heat rollers while the fabric is pressed on both sides. By pressing both sides of the woven fabric, the weft 2 can be flattened, and at the same time, the weft can be fused and impregnated in the gaps between the carbon fiber yarns of the warp 1. It can be seen that the crimp generated at the intersection is much lower than that of the conventional unidirectional fabric shown in FIG. At the same time, the straightness in the longitudinal direction of the carbon fiber yarn arranged in the warp 1 is improved.

  Conventional unidirectional fabrics generally use glass fibers having high rigidity for the wefts, and thermoplastic resin fiber yarns are attached to the glass fibers for thermal bonding. Therefore, as described above and shown in FIG. Crimping occurs at the intersection of 1 and weft 2. Glass fiber is used for the purpose of holding strength in order to prevent the collapse of the shape when handling the fabric. Further, in order to bond the carbon fiber yarns arranged in the warp yarn 1 and the glass fiber yarns of the weft yarn 2, a thermoplastic resin fiber yarn is attached to the glass fiber yarn. In order to hold the fiber and the glass fiber, the fine fiber of the resin fiber yarn is usually a thin fiber of about 55 dtex, and even such a thin fiber is a sufficient amount for bonding.

  However, since the unidirectional fabric of the present invention arranges only the thermoplastic resin fiber yarns as the weft yarns 2, in order to maintain the fabric form, the resin fiber yarns need some strength and the fineness to be used is large. The handling is also improved. Further, since the handleability is possible if the adhesive strength between the resin fiber yarn and the carbon fiber yarn is 1.5 N or more, the thermoplastic resin fiber yarn is more preferably 110 dtex or more in consideration of general handleability. Is preferably 165 to 330 dtex. If it is less than 110 dtex, it tends to meander in the warp direction after weaving, and the appearance quality is also impaired. Depending on the fineness of the carbon fiber yarn, a resin fiber yarn of 330 dtex or more may be used. The thermoplastic resin fiber yarn is not limited to nylon, polyester, polypropylene, or the like, and other thermoplastic resin fiber yarns may be used.

  Further, the weaving density of the wefts also affects the shape holding power of the fabric, and it is preferable to increase the weave density in order to obtain a fabric with good handleability. . This is because the thermoplastic resin fiber yarn originally has a large shrinkage, and when the weave density is high, the shrinkage action works more greatly, and the gap between the carbon fiber yarns arranged in the warp becomes smaller. On the other hand, when the woven density is increased in this manner, the woven fabric tends to become harder. Therefore, the weft density is preferably 3 to 10 yarns / cm (1.2 to 3.9 yarns / cm). Further, when the woven fabric of the present invention is used as a fiber base material for VaRTM molding or vacuum bag molding, the impregnation property of the resin is affected by the woven density of the woven fabric, and the woven fabric having a high woven density has a crossing point of warp and weft. From this intersection point, the resin movement is estimated to increase, and the impregnation property of the resin is accelerated.

Next, the production method of the present invention will be briefly described.
In the weaving process of a normal shuttle loom or rapier loom, as shown in FIG. 3, the warp 1 hung on the creel 11 is pulled out while passing through the guides 12 and combs 13 and passed through the warp supply device. 14 and led to 筬 15. As a method for supplying the warp 1, it is preferable that the warp 1 be cut off from the creel 11 so as to prevent twisting and twisting as much as possible. However, warp preparation by partial warping may be used. The weave structure may be any of plain weave, twill weave, and satin weave, but a plain weave having a binding force is preferable.

  For example, the weft 2 is taken up and inserted into the opening of the warp 1 opened by the elevating operation of the heald 14 according to the plain weave structure, for example, with a rapier. Alternatively, the weft 2 is once wound around the wooden pipe, and after the wooden pipe is stored in the shuttle, the shuttle is reciprocated to insert the weft 2. The inserted weft yarn 2 is beaten by a reed 15 to form a woven fabric. As shown in FIG. 4, the joining process of the weft to the warp 1 is carried out by drawing the woven fabric F horizontally through a guide roll and supplying a pair of upper and lower release papers 17 and 18 separately supplied to an upper and lower guide roll 19. , 20 so as to be sandwiched from above and below the fabric F, and attached to both the top and bottom surfaces of the fabric F, and then introduced between a pair of metal rollers 21 and 22 heated above the melting point of the weft 2. The The adhesive force of the weft 2 to the warp 1 is almost determined by the heat-sealing resin fiber yarn used.

Further, the adhesive force is somewhat affected by the pressure of the metal rollers 21 and 22, but the roller pressure at that time is rather influenced by the quality of the fabric, and the size and weight of the rollers 21 and 22 are also affected. Therefore, the clearance may be adjusted or the pressure may be adjusted according to the fabric to be bonded, and the appearance of the fabric F may be set as appropriate. However, if the pressure is too high, the weft 2 tends to meander, and fluff is generated in the fabric F. Considering these points, if the diameter of the metal roller to be used is 300 mmφ or more, there is no clearance, and the pressure can be set to 0 kg / cm ² , and sufficient bonding can be achieved only by the pressure of the so-called weight of the metal roller 21.

  Next, the fabric F pressed by the heated metal rollers 21 and 22 at a relatively high temperature of 100 ° C. or higher is brought into contact with the upper surface of the metal plate 23. The metal plate 23 is for making it easy to peel off the release papers 17 and 18 after cooling the fabric F and lowering the temperature. As the cooling method, for example, a method of forcibly cooling with a fan (not shown) or a natural cooling may be selected as appropriate. The release papers 17 and 18 attached to the upper and lower surfaces of the cooled fabric F are peeled up and down by guide rolls 24 arranged on the downstream side of the metal plate 23, and taken up by the release paper take-up rolls 25 and 26, respectively. It is done. Then, the fabric F obtained by melting the heat-sealing resin fiber yarns, which are the weft yarns 2 of the fabric F, and the carbon fiber yarns, which are the warp yarns 1, is wound by the winder 27.

  The method for measuring the adhesive strength is performed as follows. First, a unidirectional fabric is cut into a width of 150 mm in parallel to the warp 1 to prepare a test piece. The test piece is fixed with a tape on a flat surface such as a desk. Next, hook the hook of a spring scale on the center of the warp of the test piece, pull the fabric in a direction parallel to the plane and perpendicular to the hooked warp, and immediately before the fusion between the warp and the weft is peeled off Measure the maximum scale indicated by the spring scale. This is repeated 30 times for each test piece, and the average value of each is taken as the adhesive strength of the warp yarn of the unidirectional fabric.

Next, a method for molding a carbon fiber reinforced plastic according to the present invention will be described.
FIG. 5 is a cross-sectional view for explaining the CFRP molding method of the present invention. In the figure, a mold release agent is applied to a mold 101, and a predetermined number of unidirectional carbon fiber fabrics F of the present invention are laminated in a predetermined direction as a fiber base FB, and a resin is placed thereon. A release sheet that is peeled off and removed after curing, a so-called peel ply 102 is laminated. On the upper surface of the peel ply 102, a medium 103 for diffusing the resin over the entire surface of the fiber base FB is disposed. Further, a spiral tube 104 for depositing resin is disposed on both ends of the fiber base FB in the fiber axis direction, a suction port 105 of a vacuum pump (not shown) is attached to the spiral tube 104, and the whole is covered with a bag film 106, and air Seal material 1 around the bag film 106 to prevent leakage
07 is bonded to the mold 101.

  A matrix resin discharge port 109 injected from a resin tank (not shown) is connected to the spiral tube 104. In a resin tank (not shown), a room temperature curable thermosetting resin in the form of a syrup at room temperature with a predetermined amount of curing agent added is placed. The effect of resin impregnation due to the viscosity of the resin used is large. In normal VaRTM molding and vacuum bag molding, a low-viscosity product with good resin flowability is preferred. The resin viscosity at the time of resin injection is preferably 500 mPa · s or less, more preferably 300 mPa · s or less. Next, the fiber substrate FB covered with the bag film 106 by a vacuum pump (not shown) is evacuated to a vacuum pressure of about 70 to 76 cmHg, and then the valve 108 is opened to inject the matrix resin.

  At this time, the inside covered with the bag film 106 is in a vacuum state, and the flow resistance of the resin is smaller in the surface direction of the medium 103 than in the length direction of the fiber substrate FB (left and right direction in FIG. 5). After the resin is diffused on the front surface of the medium 103, the impregnation proceeds in the thickness direction of the fiber base FB. However, the degree of impregnation is considerably affected by the form of the carbon fiber fabric used as the fiber base FB. Naturally, the impregnation of the resin in the thickness direction is completed faster as the woven fabric has a gap between the fiber yarns. The medium 103 is not particularly limited, such as a mesh-like sheet using a monofilament such as polyethylene or polypropylene having a fiber diameter of about 0.2 to 0.5 mm, or a sheet formed by Russell knitting. The vacuum pump is preferably operated until at least the impregnation of the matrix resin is completed, and the bag film is preferably kept in a vacuum state until the completion of the impregnation. After the resin impregnation is completed, the peel ply 102 is peeled off, the medium 103, the bag film 106 and the like are removed, and the mold is removed from the mold 101 to obtain a carbon fiber reinforced plastic (CFRP) molded product.

  Note that the peel ply 102 used in the present invention needs to allow the resin to pass therethrough, and a nylon fiber fabric, a polyester fiber fabric, a glass fiber fabric, or the like can be used. The smaller the woven density of the woven fabric, the larger the gap, so that the resin can pass easily. On the other hand, when the resin is cured and finally peeled, irregularities are generated on the surface of the fiber substrate. For this reason, it is preferable to select a resin that is as excellent as possible in resin passage and in which unevenness is unlikely to occur on the surface. The bag film 106 needs to have confidentiality, and a nylon film, a polyester film, or the like can be used.

  In the production method of the present invention, the medium 103 for diffusing the resin is used in order to make the impregnation property of the resin quick. However, even if the medium 103 is not used, the impregnation time is somewhat longer. However, it is not limited to these because it hardly affects the moldability.

Examples relating to the fiber-reinforced plastic of the present invention will be described more specifically below.
(Examples 1-5)
As shown in Table 1, weaving was carried out using a Tsudakoma rapier loom using 12,000 filaments of carbon fiber (Pyrofil TR50S manufactured by Mitsubishi Rayon Co., Ltd.). A heat-bonding fiber (manufactured by Toray Industries, Inc.) was used as the weft, and a unidirectional woven fabric with a basis weight of 200 and 300 g / m ² was woven. After weaving, the woven fabric was introduced into upper and lower metal heat rollers set at 130 ° C. with the apparatus shown in FIG. 4 at a speed of 3 m / min, and the heat-fused fiber yarn arranged on the weft was used as the warp carbon fiber yarn. Both sides were pressure-bonded and processed into a fusion-bonded unidirectional fabric, and the handleability and adhesive strength were evaluated. The results are shown in Table 1.

In Example 1, each fabric density of the heat-sealing yarn as the weft is ² , 1.2, ² , 3, so that the basis weight is 200 g / m ² and in Examples 2 to 5, the basis weight is 300 g / m ² . When changed to 9, 2 / cm respectively, all of Examples 1 to 4 had sufficient adhesiveness and good handleability. In particular, Example 4 had a very strong adhesive force. In Example 5, when the heat-sealing resin fiber yarn was used at 110 dtex, the adhesiveness was the same as in Examples 1 to 3.

(Comparative Examples 1-3)
Similarly, as shown in Table 1, we used carbon fiber bundle yarns (Pyrofil TR50S manufactured by Mitsubishi Rayon Co., Ltd.) similar to those in Examples 1 to 5 as warps and weaved them using a Tsudakoma rapier loom. For the wefts of Comparative Examples 1 and 2, the same heat-fusible fibers (made by Toray Industries, Inc.) as in Examples 1 to 5 were used, and a unidirectional woven fabric was woven with a basis weight of 300 g / m ² . The weave density of Comparative Examples 1 and 2 was set to 2, 5 / cm, respectively, and after weaving, introduced into the upper and lower metal heat rollers under the same conditions as in Examples 1 to 5, and the heat-bonded fiber yarn arranged on the weft Was bonded to both sides of a carbon fiber yarn of warp and processed into a fusion-bonded unidirectional fabric, and the handleability and adhesive strength were evaluated. The results are shown in Table 1.

  In Comparative Example 1, a 55 dtex heat-sealed resin fiber yarn was used for the weft, but the adhesiveness was considerably inferior and could not be put to practical use. In Comparative Example 1, a heat-sealable resin fiber yarn of 330 dtex was used as the weft, and when the weft density was 0.5 yarn / cm, the weft pitch was too coarse, the handling property was very poor, and the adhesive strength was also inferior. It was. In Comparative Example 3, a so-called conventional unidirectional woven fabric in which a heat-fusing resin fiber yarn was added to glass fiber as a weft and was very hard, but the adhesiveness was good.

(Example 6)
In order to carry out VaRTM molding, all of the woven fabrics obtained in Example 3 cut into 300 × 300 mm squares were laminated with the warp angle set to 0 °. The resin used was an infusion molding epoxy resin XNR6815 (mixture resin viscosity 260 mPa · s) manufactured by Nagase Chemtech Co., Ltd., and the main agent and curing agent were injected in a blending ratio of 100: 27 and maintained at 30 ° C. for 24 hours after molding. Further, post-curing was performed at 80 ° C. for 2 hours to produce a molded plate. Subsequently, the compressive strength was measured based on the SACMA method SRM1R standard. As shown in Table 2, the physical properties of the obtained composite were particularly improved by about 40% in compressive strength as compared with Comparative Example 3.

* Comparative Example 3: Conventional unidirectional woven fabric with weft added glass fiber with thermoplastic resin Criteria: ◎ ・ ・ ・ Very good
○ ・ ・ ・ Good
× ... defect

DESCRIPTION OF SYMBOLS 1 Warp 2 Weft 11 Creel 12 Guide 13 Comb 14 Held 15 筬 16 Guide rolls 17 and 18 Release papers 19 and 20 Upper and lower guide rolls 21 and 22 (Heating) Metal roller 23 Metal plate 24 Guide rolls 25 and 26 Release paper take-up roll 27 Winder 101 Mold 102 Peel Ply 103 Medium 104 Spiral Tube 105 Suction Port 106 Bag Film 107 Sealing Material 108 Valve 109 Discharge Port Wa Warp Weft F Woven Fabric FB Fiber Base

Claims (6)

  A method of manufacturing a woven fabric in which a plurality of carbon fiber yarns are arranged in the warp direction and woven using thermoplastic resin fiber yarns in the wefts orthogonal to the warp yarns, wherein the weft yarns have a fineness of 110 to 660 dtex and a weft density of 1. A method for producing a unidirectional woven fabric, in which both sides of the woven fabric composed of 2 to 3.9 yarns / cm are heated at a temperature equal to or higher than the melting point of the weft yarns and subjected to surface pressure bonding so that the warp yarns are thermally fused.   A unidirectional fabric obtained by the production method according to claim 1.   The unidirectional fabric according to claim 2, wherein the adhesive strength between the warp and the weft is 1.5 N or more.   In a separate process, a woven fabric in which carbon fiber yarns are arranged as warps and thermoplastic resin fiber yarns are used as wefts, and both sides of the woven fabric are bonded on both sides with a heating roll having a temperature equal to or higher than the melting point of the wefts. A method for producing a unidirectional fabric in which the fabric is integrally held.   A fiber-reinforced plastic molded article in which a laminate of at least one layer of the unidirectional woven fabric according to claim 2 or 3 is used as a fiber base material.   The unidirectional woven fabric according to claim 2 or 3 is laminated as a fiber base material on at least one layer on a mold, the whole fiber base material is covered with a bag film, and then the inside covered with the bag film is in a vacuum state And forming a fiber reinforced plastic by injecting and diffusing a room temperature curable resin from one surface perpendicular to the fiber axis of the laminated fiber base material, and impregnating the fiber base material with the room temperature curable resin.