JP2017160571A - Manufacturing method of reinforcing fiber woven fabric and manufacturing apparatus thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a reinforcing fiber woven fabric in which, when carrying out a heat treatment of reinforcing fiber woven fabric, deformation (bending of weaving yarn) of a structure of a reinforcing fiber woven fabric is suppressed and a heat treatment (filling treatment) effective for a shape retention of a woven structure is applied.SOLUTION: There is provided a manufacturing method of a reinforcing fiber woven fabric. When weaving a reinforcing fiber woven fabric in which at least warp is composed of a reinforcing fiber and weft is composed of two fibers having different finenesses with a rapier loom, the two fibers are held at two weft yarn holding parts which a rapier has, respectively, and the weft yarns are simultaneously inserted in one time weft insertion so that the weft yarns are aligned alternately in a warp direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a reinforced fiber fabric and an apparatus for manufacturing the same. More specifically, the present invention relates to a method for manufacturing a woven fabric in which two weft yarns having different finenesses are simultaneously inserted so that the weft yarns are alternately arranged in the direction of the warp yarns, and the weft yarn is not mishandled. It is. In particular, when one of the fibers of the weft contains heat-melting fibers, when heat-treating the reinforcing fiber fabric, it suppresses the collapse of the reinforcing fiber fabric (bending of the weaving yarn) and maintains the shape of the weaving tissue. The present invention relates to a method for producing a reinforced fiber fabric capable of performing an effective heat treatment (crushing treatment).

  Conventionally, reinforced fibers such as carbon fibers have a high specific strength and specific elastic modulus. Therefore, sports / leisure products that have a large weight reduction effect as a fiber reinforced plastic (hereinafter referred to as FRP) material, aircraft use and general It is often used for industrial purposes.

  Such FRP molding methods include various methods such as hand lay-up molding, autoclave molding, and RTM molding. The molding method depends on the shape and number of molded products, required characteristics, or allowable product price. It is decided as appropriate.

  In these various molding methods, it is common that the reinforcing fiber is once made into an intermediate base material in the process of producing FRP, and the intermediate base material is often used in the form of a woven fabric as the intermediate base material. . However, such a reinforced fiber fabric has a problem that the fabric is deformed when the fabric is handled or the weaving yarn is shifted and misaligned, and that the weaving yarn is easily unraveled when the fabric is cut.

  To solve this problem, weaving reinforced fibers and thermoplastic fibers simultaneously and then heat-treating them (heated) to soften or melt the thermoplastic fibers, thereby reinforce the intersection between the warp and weft. Proposals have been made to obtain a reinforced fiber woven fabric that has a function of preventing the warp or weft of fibers and a form stabilizing function and is excellent in handleability.

  For example, Patent Document 1 proposes a method in which a hot melt fiber is wound around a weft thread and inserted. With such a proposal, we can insert it with simple equipment. Patent Document 2 proposes a method in which a hot-melt fiber is arranged at the center of the weft yarn (Patent Document 2). With this method, the wetting effect expected may be obtained because the weft insertion position is stabilized.

JP-A 63-152537 JP 2012-172281 A

  However, in the method described in Patent Document 1, since the hot melt fiber is wound around the weft yarn, the insertion position is not stable, and the portion not subjected to the squeezing process after the squeezing process There is a problem that occurs.

  Further, the method described in Patent Document 2 has a problem that it is difficult to stably hold and insert a weft yarn and a hot melt fiber having different finenesses with a rapier, and an error in inserting the hot melt fiber is likely to occur. .

  That is, in the methods described in Patent Document 1 and Patent Document 2, since the weaving of the woven structure is insufficient, a woven fabric in which the structural collapse of the reinforcing fiber woven fabric (weaving of the woven yarn) is completely suppressed can be obtained. It was not done. The reinforcing fiber woven fabric obtained by such a conventional technique does not exhibit the high mechanical properties when molded into FRP because the reinforcing fibers are not straightly oriented, and obtains a molded product with excellent surface smoothness. There was a problem that it was not possible.

  Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, suppress the structural collapse of the reinforcing fiber fabric (the bending of the weaving yarn), and provide a method for inserting a hot-melt fiber effective for maintaining the shape of the weaving structure. It is providing the manufacturing method and apparatus of a textile fabric.

  In order to achieve the above object, the present invention adopts the following configuration.

  That is, the manufacturing method of the reinforced fiber fabric of the present invention is as follows.

At least a method for producing a reinforcing fiber fabric in which a warp yarn is composed of reinforcing fibers and a weft yarn is woven with a rapier loom comprising two fibers having different finenesses.
The rapier loom has two weft thread gripping sections. By alternately inserting the weft threads in one weft insertion while gripping the two fibers with each gripping section, the weft threads alternately in the warp direction. A method for producing a reinforced fiber fabric, characterized by weaving in a line.

  Moreover, the manufacturing apparatus of the reinforced fiber fabric of this invention is the following.

At least a reinforcing fiber fabric manufacturing apparatus for weaving a reinforcing fiber fabric in which warp yarns are composed of reinforcing fibers and weft yarns are composed of two fibers having different finenesses,
An apparatus for producing a reinforcing fiber fabric, comprising two weft yarn gripping portions capable of simultaneously inserting weft yarns in one weft insertion and capable of weaving so that the weft yarns are alternately arranged in the warp yarn direction.

  According to the present invention, weft yarns composed of two fibers having different finenesses are alternately inserted in the direction of the warp yarn by simultaneously inserting the weft yarns composed of two fibers having different finenesses in one weft insertion. Can be woven to line up. In particular, in the case where the weft yarn is carbon fiber and hot melt fiber, since the weft yarn and hot melt fiber are separately gripped and inserted by a rapier loom, the occurrence of gripping errors is eliminated, and the insertion of carbon fiber and hot melt fiber is eliminated. Since the position is also stable, the mesh fabric after melting the hot-melt fiber suppresses the collapse of the reinforcing fiber fabric (the bending of the weaving yarn) and stabilizes the shape of the woven structure.

  The reinforcing fiber woven fabric obtained by the production method of the present invention is not only exhibiting mechanical properties such as high strength and elastic modulus when molded into FRP, but also excellent because the reinforcing fibers are straightly oriented. It is possible to provide a reinforcing fiber fabric that can achieve the appearance quality. Such an effect is maximally exerted in the bi-directional fabric.

It is a schematic side view which shows an example of the apparatus which manufactures the reinforced fiber fabric which concerns on this invention. It is an enlarged view of the apparatus (rapier part) which manufactures the conventional reinforced fiber fabric. It is an enlarged view of the apparatus (rapier part) which manufactures the conventional reinforced fiber fabric. It is an enlarged view of the apparatus (rapier part) which manufactures the reinforced fiber fabric concerning this invention. It is a schematic plan view which shows the reinforced fiber fabric manufactured by Example 1 which concerns on this invention. It is a schematic plan view which shows the reinforced fiber fabric manufactured by the comparative example 1 which is outside the scope of the present invention.

  The method for producing a reinforced fiber fabric of the present invention is a method for producing a reinforced fiber fabric in which at least a warp yarn is composed of reinforcing fibers and a weft yarn is composed of two fibers having different finenesses, and the rapier loom is used to weave the reinforcing fiber fabric. The rapier loom has two weft yarn gripping portions, and the weft yarns are inserted into the warp yarns by simultaneously inserting the weft yarns in one weft insertion while holding the two fibers with each gripping portion. It is characterized by weaving so as to be arranged alternately in the direction. Thereby, two fibers (weft yarns) having different finenesses can be simultaneously inserted, and the arrangement position of the two fibers (weft yarns) having different finenesses can be stabilized. In particular, when carbon fibers and hot melt fibers are used as two fibers (wefts) having different finenesses, the insertion position of the hot melt fibers is constant, and the hot melt fibers can be stably inserted. Is heated to soften or heat melt the hot-melt fiber contained in the weft yarn to wind up the reinforcing fiber fabric, thereby obtaining a reinforcing fiber fabric free from misalignment.

  Hereinafter, the manufacturing method and the manufacturing apparatus of the reinforcing fiber fabric of the present invention, in which at least the warp yarn is composed of reinforcing fibers and the weft yarn is composed of two fibers having different finenesses are woven with a rapier loom. Each step will be described in detail with reference to FIG. 1 by dividing it into A) weaving step, (B) heating step, and (C) winding step. In addition, when not using a hot melt fiber as a weft, (B) heating process is unnecessary.

(A) Weaving process In the weaving process, first, the warp yarns 2 (2a, 2b) made of a plurality of reinforcing fibers in the form of a sheet drawn from the bobbin 1 are warped through the back rollers 3, 4. Each of these is passed through the cage 5 (5a, 5b) and opened and closed by its vertical movement. When the warp yarns 2a and 2b are opened, two fibers (weft yarns 7 (7a and 7b)) having different fineness unwound from the weft bobbins 6 (6a and 6b) by the rapier 9 at the shed It is inserted at the same time in the horizontal insertion.

  Here, enlarged views of the rapier 9 are shown in FIGS.

  FIG. 2 is a schematic view of a conventional rapier, and FIG. 6 shows a state in which two wefts are gripped by this rapier. When trying to grip two weft yarns at the same time with the rapier of FIG. 2, the gripping position is not stable, and even if it is gripped, the insertion position of both yarns is not stable. In addition, one of the two weft yarns is likely to be mishandled, and this phenomenon is particularly noticeable when the difference in fineness between the two weft yarns is large.

  In the manufacturing method or the manufacturing apparatus of the present invention, the rapier loom has two weft holding portions. Specifically, by using a rapier loom having a rapier shown in FIG. 4, there are two weft thread gripping portions on the rapier. Therefore, while gripping two fibers (weft yarn) with each gripping portion, Two weft yarns can be inserted simultaneously in the weft insertion, and even when two fibers having different fineness are used as the weft yarn, simultaneous insertion can be performed, and the arrangement position of the two fibers is also stabilized. In particular, the greater the difference in the fineness of the two weft yarns, the more likely to be a gripping error during simultaneous insertion, so that the effect of using the rapier shown in FIG. 4 can be further exerted.

  In the present invention, the weft is composed of two fibers having different fineness. The two fibers of the weft yarn are not particularly limited as long as the fineness is different. However, since the process of simultaneously inserting the weft yarn in one weft insertion is stabilized, the weft yarn of the two fibers having different finenesses is used. The fineness ratio is preferably 5 times or more, and more preferably 10 times or more. Moreover, although the upper limit is not specifically limited about the fineness ratio of two fibers with different fineness which is a weft, it is preferable that it is about 200 times or less practically.

  In addition, the fineness here means the fiber weight per unit length obtained by dividing the fiber weight by the length.

  Then, it is beaten by the scissors 8, and the scissors 5a and 5b are moved up and down again to close, and the fabric 9 is woven. In the reinforcing fiber fabric 9 woven in this way, at least the warp yarn 2 is composed of reinforcing fibers, the weft yarns 7a and 7b are composed of two fibers having different finenesses, and the weft yarns are alternately arranged in the warp yarn direction. The arrangement is as follows.

  The present invention is to provide a method for producing a reinforced fiber woven fabric that exhibits excellent mechanical properties, is excellent in handleability during molding, and can suppress the collapse of the structure (the bending of the weaving yarn). Therefore, in the present invention, reinforcing fibers are used for at least the warp yarns. The reinforcing fiber applicable as the warp is not particularly limited, and examples of the reinforcing fiber suitable as the warp include carbon fiber, glass fiber, and aramid fiber. As such a reinforcing fiber, a carbon fiber excellent in specific strength and specific elastic modulus is preferable. Among them, a polyacrylonitrile type having a fiber diameter of 5 to 10 μm, a tensile strength of 3 to 7 GPa, and a tensile elastic modulus of 200 to 500 GPa. By using the multifilament, it is possible to obtain FRP exhibiting higher mechanical properties.

  The total fineness of the reinforcing fiber used as the warp is preferably a thick yarn in the range of 100 to 3,000 tex. It is preferable to use reinforcing fibers having a total fineness in the above range as warp yarns, because when the hot-melt fibers are used as the weft yarns, the effects of the present invention that are manifested by the squeezing by the hot-melt fibers are sufficiently exhibited. In addition, when the reinforcing fiber is a carbon fiber, the manufacturing cost can generally be reduced as the fineness increases, and thus there is an advantage that a low-cost textile substrate can be provided.

  If the total fineness of the reinforcing fibers is less than 100 tex, the number of crossing points of the warp and weft will increase, so that the woven form is stable, there is no need to awaken, and the shape as it is without performing the heat treatment of the present invention. The significance of the present invention is diminished. On the other hand, if the total fineness of the reinforcing fibers exceeds 3,000 tex, a reinforcing fiber fabric with uniform fiber dispersion may not be obtained unless the yarn width is expanded uniformly, and the reinforcing fibers exhibit sufficient mechanical properties. It may not be easy to obtain a woven fabric.

  As described above, in the present invention, the weft yarn is composed of two fibers having different finenesses, and one of them is preferably a hot-melt fiber.

  Furthermore, in a more preferred embodiment of the reinforced fiber fabric produced in the present invention, at least the warp yarn is composed of carbon fiber, the weft yarn is composed of at least carbon fiber and hot-melt fiber (fibrous mesh yarn), and Carbon fiber with excellent specific strength and specific modulus of elasticity because the fabric will not be misaligned in the molding process, as long as the hot melt fiber is melted and bonded at the intersection of the warp and weft. It is possible to obtain a composite material that is lightweight and has excellent mechanical properties.

  The hot-melt fiber suitable as the weft is not particularly limited as long as it is a fiber having a melting property. Note that having the property of melting means that the melting point is observed when the fiber is heated. The hot-melt fiber is preferably a thermoplastic resin fiber because it can be easily processed into a fibrous form. Examples of the thermoplastic resin include polyamide, polyester, polypropylene, polyphenylene sulfide, polyvinyl alcohol, copolymer resins, polymer alloy resins, and polymer blend resins. Among them, a copolymer resin is preferable because it softens and melts at a relatively low temperature, and particularly, a copolymer polyamide having good adhesiveness with an epoxy resin that is frequently used as a matrix resin of a composite material is preferable.

  Whether or not the melting point is observed in the fiber is determined by measuring as follows. That is, the measurement is performed according to the melting point measurement method described in Section 8.19 of the JIS L 1013: 2010 chemical fiber filament yarn test method.

  Furthermore, in the hot melt fiber, a thermoplastic resin and a thermosetting resin can be used in combination. In this case, it may be a single resin composition in which both are compatible, or may be a phase-separated resin composition that is incompatible, or may be used in combination as independent resins. . In particular, in order to improve the mechanical properties as FRP (particularly, delamination and interlaminar shear strength when reinforcing fiber fabrics are laminated), a high toughness thermoplastic resin and a thermosetting resin excellent in heat meltability It is an especially preferable aspect to use it as a resin composition in which is compatible. In this case, a high-toughness thermoplastic resin alone has a problem of heating temperature, and a thermosetting resin excellent in heat melting property has a problem of handleability alone and is difficult to apply. However, by compatibilizing them, the above problems can be solved and the advantages of both can be maximized.

  The thermoplastic resin and thermosetting resin contained in the hot-melt fiber are appropriately selected depending on the purpose, but are preferably a thermoplastic resin from the viewpoint of achieving a concealing effect. When the hot melt fiber contains a thermoplastic resin, the melting point of the thermoplastic resin is preferably 80 to 200 ° C.

  When the melting point of the thermoplastic resin contained in the hot-melt fiber is less than 80 ° C. or the glass transition temperature is less than 50 ° C., the heating temperature required for weaving the fabric is low and the workability is excellent, but the heat resistance in the case of a composite material is excellent. In addition to being greatly reduced, it may dissolve when the raw material is stored or the fabric is transported, and may be inferior in handleability. On the other hand, when the melting point of the thermoplastic resin contained in the hot melt fiber exceeds 200 ° C. or the glass transition temperature exceeds 170 ° C., the heat resistance when the composite material is made is improved, but the heating temperature during weaving of the woven fabric is improved. Is too high, and workability may be extremely reduced.

  In the present invention, the melting point or glass transition temperature is the melting point or glass transition temperature measured at a heating rate of 20 ° C./min with a DSC (Differential Scanning Calorimeter) after the object to be measured is completely dry. Point to.

  The structure of the woven fabric used in the present invention is not particularly limited, but at least a plain weave, twill weave, satin weave, or non-crimp structure using reinforcing fiber yarns (weft yarns that are warp yarns and auxiliary yarns are oriented in a straight line) A tissue or the like that is crossed and integrated with each other is preferably used.

(B) Heating step In the heating step, the woven reinforcing fiber fabric 9 is heat-treated in a non-contact manner by radiation from the heating source 16, and the thermoplastic resin and / or thermosetting contained in the hot-melt fiber. Soften or heat melt the resin.

  The heating source is preferably heated by radiation from an infrared heater such as far infrared rays, middle infrared rays, and near infrared rays. When such a heat source is used, the reinforcing fiber fabric 9 can be efficiently heated without contact with the reinforcing fiber fabric 9. In addition, the equipment can be reduced in size without interfering with weaving, and when the loom is stopped, the heating source for the fabric can be shut off to suppress overheating.

(C) Winding process In the winding process, the wound roll 17 is wound up on the winding core 13 through the take-up roller 12 and the take-up guide roller 15. FIG. 1 shows an example in which a winding device of a loom is used. However, a winding device is provided behind the weaving device to secure a space, and a heating device is provided between the winding device and the winding device. Heating can also be performed.

Example 1
A polyacrylonitrile (PAN) carbon fiber yarn (total fineness: 198 tex) having a tensile strength of 3,530 MPa, a tensile modulus of 230 GPa, and a filament number of 3,000 is used as the warp yarn, and the same as the warp yarn as the weft yarn A bi-directional fabric A was produced by the following procedure using carbon fiber and aramid fiber yarn (total fineness: 21.5 tex) using the apparatus shown in FIG.

  In the weaving step, first, a plurality of warp yarns 2 drawn out from the bobbin 1 are arranged so as to have a density of 5 yarns / cm, and then passed through the back rollers 3 and 4, and each warp yarn 2 is put into two ridges 5a. 5b was passed alternately. When the warp yarns 2a and 2b passed through the two reeds 5a and 5b are opened, the weft yarn 7 (7a and 7b) is driven into the reed so that the density becomes 5 / cm by rapier. Went. Then, it sent out toward the core 13 through the guide roller, and wound up on the core 13 in the winding process to obtain a roll 17.

The obtained bi-directional fabric A is a fabric having a fabric weight of 209 g / m ^{2 and a} plain fabric, and when inserting the weft of the fabric, a rapier having two weft gripping portions was used, so there was no mistake in inserting the weft. The weft carbon fibers and the aramid fibers were alternately arranged, and no weaving (texture collapse) of the weft was observed. A schematic plan view of the bidirectional fabric A is shown in FIG.

(Example 2)
A polyacrylonitrile (PAN) carbon fiber yarn (total fineness: 198 tex) having a tensile strength of 3,530 MPa, a tensile elastic modulus of 230 GPa, and a filament number of 3,000 is used as the warp yarn, and the weft yarn is the same as the warp yarn. Using hot melt fiber of carbon fiber and copolymer polyamide fiber yarn (total fineness: 33.5 tex) having a melting point of 110 ° C,
Using the apparatus shown in FIG. 1, a bidirectional fabric B was produced by the following procedure.

  (A) In the weaving step, first, a plurality of warp yarns 2 pulled out from the bobbin 1 are arranged so as to have a density of 5 / cm, and then two warp yarns 2 are passed through the back rollers 3 and 4. The bottles 5a and 5b were passed alternately. Then, when the warp yarns 2a and 2b passed through the two reeds 5a and 5b were opened, the weft yarn 7 was driven into the reed port at a rapier density of 2.5 / cm, and the reed was performed. .

  (B) In the heating step, the woven fabric was heat-treated from the surface of the fabric in a non-contact manner using only a far-infrared heater as the heating source 10, and the hot-melt fiber contained in the weft was melted by heat. Here, the heater temperature was adjusted to 120 ° C. on the surface of the fabric. Then, it sent out toward the core 13.

  (C) In the winding process, the roll 17 was wound around the core 13.

The obtained bi-directional fabric B is a fabric having a fabric basis weight of 215 g / m ² and a rapier having two weft gripping portions when inserting the weft of the fabric. Since the fiber can be gripped and inserted stably, the insertion position of the hot melt fiber is stable, and the crossing point of the warp and weft is bonded, so that weaving (texture collapse) of the weft in the reinforced fiber fabric after winding It was not observed at all.

(Example 3)
A bi-directional fabric C was produced in the same manner as in Example 1 except that a copolyamide fiber yarn having a total fineness of 5.6 tex was used.

The obtained bi-directional woven fabric C is a woven fabric having a fabric basis weight of 201 g / m ² and a rapier having two weft gripping portions when inserting the weft of the fabric. Since the fiber can be gripped and inserted stably, the insertion position of the hot melt fiber is stable, and the crossing point of the warp and weft yarns is adhered, so that weaving (texture collapse) of the weft yarn is completely observed in the wound fabric Was not.

Example 4
A polyacrylonitrile (PAN) carbon fiber yarn (total fineness: 800 tex) having a tensile strength of 4,500 MPa, a tensile modulus of 230 GPa, and a filament number of 12,000 is used as the warp yarn, and the same as the warp yarn as the weft yarn Using carbon fiber and a copolymerized polyamide fiber yarn having a melting point of 110 ° C. (total fineness: 5.6 tex), the density of the plurality of warps 2 drawn from the bobbin 1 and the density of the weft yarn are 1.25 yarns / cm. A bi-directional fabric D was produced in the same manner as in Example 2 except that it was arranged as described above.

The obtained bi-directional woven fabric D is a woven fabric having a fabric basis weight of 201 g / m ² and a rapier having two weft gripping portions when inserting the weft of the fabric. Since the fiber can be gripped and inserted stably, the insertion position of the hot melt fiber is stable, and the crossing point of the warp and weft yarns is adhered, so that weaving (texture collapse) of the weft yarn is completely observed in the wound fabric Was not.

(Comparative Example 1)
In the apparatus shown in FIG. 1, a bi-directional fabric E was produced in the same manner as in Example 1 except that weaving was performed using a rapier having a single weft gripping portion.

The obtained bi-directional woven fabric E is a woven fabric having a fabric basis weight of 209 g / m ² plain structure, a rapier gripping portion at one place, and when trying to insert two weft yarns having different finenesses simultaneously, an aramid fiber The gripping position of the aramid fibers was not stable, and a gripping error of the aramid fibers occurred, resulting in a woven fabric in which aramid fibers were not partially inserted. A schematic plan view of the unidirectional fabric E is shown in FIG.

(Comparative Example 2)
In the apparatus shown in FIG. 1, a bidirectional fabric F was produced in the same manner as in Example 3 except that weaving was performed using a rapier having a single weft gripping portion.

The obtained bi-directional woven fabric F is a woven fabric having a fabric weight of 201 g / m ^{2 in a} plain structure, and as in Comparative Example 1, a mishandling of the hot melt fiber occurs when inserting the weft yarn, and the hot melt fiber is partially inserted. The fabric was not made. The results of the above examples and comparative examples are shown in Table 1.

  According to the method for manufacturing a reinforced fiber fabric of the present invention, two fibers having different fineness are inserted simultaneously in one weft insertion so that the two fibers having different fineness are alternately arranged in the warp yarn direction. Can be woven. In particular, when the weft yarn is carbon fiber and heat-melt fiber, the carbon fiber and heat-melt fiber are gripped and inserted separately by the rapier, so there is no occurrence of grip errors, and the insertion position of the carbon fiber and heat-melt fiber Therefore, the reinforced fiber woven fabric that has been agitated after melting the hot-melt fiber suppresses the collapse of the structure (the bending of the weaving yarn), and the woven structure maintains its shape stably.

  The reinforcing fiber woven fabric obtained by the production method of the present invention is not only exhibiting mechanical properties such as high strength and elastic modulus but also excellent when molded into FRP because the reinforcing fibers are oriented straight. Appearance quality can be achieved. Such a reinforced fiber fabric is suitably used as a reinforcing material for FRP used in other general industries including repair and reinforcement of structures, transportation equipment (automobiles, ships, aircraft, bicycles, etc.), sporting goods, and FRP types. .

1: Bobbin 2, 2a, 2b: Warp
3, 4: Back rollers 5, 5a, 5b: 綜 絖 6, 6a, 6b: Weft bobbins 7, 7a, 7b: Weft 8: 筬 9: Rapier 10: Weaving 11, 14, 15: Take-up guide roller 12: Take-up roller 13: Core 16: Heating source 17: Scrolls 21, 24: Warp yarn (carbon fiber)
22, 25: Weft yarn (carbon fiber)
23, 26: Weft (heat-melted fiber)

Claims (4)

At least a method for producing a reinforcing fiber fabric in which a warp yarn is composed of reinforcing fibers and a weft yarn is woven with a rapier loom comprising two fibers having different finenesses.
The rapier loom has two weft thread gripping sections. By alternately inserting the weft threads in one weft insertion while gripping the two fibers with each gripping section, the weft threads alternately in the warp direction. A method for producing a reinforced fiber fabric, characterized by weaving in a line.   The method for producing a reinforced fiber fabric according to claim 1, wherein a fineness ratio of two fibers having different finenesses is 5 times or more.   The method for producing a reinforced fiber fabric according to claim 1 or 2, wherein the two fibers having different finenesses are a carbon fiber and a hot-melt fiber. At least a reinforcing fiber fabric manufacturing apparatus for weaving a reinforcing fiber fabric in which warp yarns are composed of reinforcing fibers and weft yarns are composed of two fibers having different finenesses,
An apparatus for producing a reinforcing fiber fabric, comprising two weft yarn gripping portions capable of simultaneously inserting weft yarns in one weft insertion and capable of weaving so that the weft yarns are alternately arranged in the warp yarn direction.

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