JP2011219889A - Fabric woven from reinforced fiber yarn and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fabric woven from reinforced fiber yarn enabling easy recognition of direction even after cutting, having an excellent drapeability, and suitable especially for the molding of a fiber reinforced plastic body with a curved surface molded by pasting pieces of fabric, and to provide a method for manufacturing the fabric woven from reinforced fiber yarn.SOLUTION: The fabric woven from reinforced fiber yarn comprises warp a1, a2, a3...an and weft b1, b2, b3...bn both composed of reinforced fiber yarn crossing each other without sticking. Auxiliary yarn 3 composed of non-sticking material is disposed on either the warp or the weft along the length of yarn in the shape of a stripe to be direction indicating yarn. A couple of mails disposed vertically is used for disposing the auxiliary yarn 3 on the middle part in the width direction on the upper side of the reinforced fiber yarn, the auxiliary yarn is passed through the upper mail and the reinforced fiber yarn is passed through the lower mail.

Description

  The present invention relates to a reinforcing fiber yarn woven fabric in which auxiliary yarns as direction indicating yarns are arranged only in one of a warp yarn and a weft yarn, and the warp direction and the weft direction of the fabric can be easily recognized, and a method for manufacturing the same.

Reinforcing fibers, such as carbon fibers with excellent mechanical properties such as specific strength and elastic modulus, are processed into intermediate materials such as woven fabrics, woven prepregs and unidirectional prepregs, and these are laminated and impregnated with a matrix resin material. Carbon fiber reinforced plastics are used in a wide range of fields. Conventionally, it is difficult to distinguish the warp direction from the weft direction in bi-directional carbon fiber fabrics and fabric prepregs in which carbon fiber yarns are used for both warp and weft.
Therefore, when cutting a fabric or a fabric prepreg and laminating a plurality of the cut pieces, it is not possible to recognize the direction of the warp and the width of the fabric piece, and the predetermined laminated configuration is wrong. Sometimes.

  In order to solve such a problem, a method of arranging an auxiliary yarn so that the direction of the fabric piece can be easily recognized even after cutting the fabric or the fabric prepreg has been conventionally performed. However, even if the auxiliary yarn is arranged, the auxiliary yarn may deviate from the center of the reinforcing fiber yarn or may be difficult to see because it is hidden behind the reinforcing fiber yarn, and the auxiliary yarn is surely displayed at the center of the reinforcing fiber yarn width. It was strongly desired to make it come out.

  Therefore, a reinforcing fiber yarn woven fabric obtained by fusing the auxiliary yarn as a sizing agent to the reinforcing fiber yarn and arranged on the warp yarn or the weft yarn and substantially at the center of the yarn width is disclosed in, for example, Japanese Patent Application Laid-Open No. 10-317247 ( Patent Document 1). According to this woven fabric, the auxiliary yarn which is a setting agent is fused on the warp yarn or the weft yarn at the approximate center of the yarn width and does not deviate from the approximate center of the yarn width. However, when the reinforcing fiber yarn and the auxiliary yarn are fused, the shear deformation performance of the fabric is lowered, the fitting property is not obtained, and the fabric is difficult to follow along the curved surface. Here, as a material as a squeezing agent, Patent Document 1 mentions a low-melting point thermoplastic polymer, and the auxiliary yarn as a squeezing agent is an auxiliary yarn made of a low-melting point thermoplastic polymer, or glass. It is described that an auxiliary yarn in which a clogging agent made of a low melting point thermoplastic polymer is wound around the fiber yarn is used.

Japanese Patent Laid-Open No. 10-317247

Thus, there has been a strong demand for the development of a reinforced fiber yarn fabric that can easily recognize the direction of the fabric after cutting and is particularly suitable for forming a curved surface of a fiber reinforced plastic that is molded while a fabric piece is attached. It had been.
Accordingly, an object of the present invention is to make it possible to easily recognize the direction of a woven fabric in a reinforcing fiber yarn woven fabric using reinforcing fiber yarns when manufacturing a composite molded body having a curved surface while cutting and bonding the woven fabric. It is an object of the present invention to provide a reinforced fiber yarn fabric excellent in drapability in which a laminated structure is reliably formed and a fiber reinforced plastic having a desired shape can be formed.

In order to solve the above-mentioned problems, the reinforcing fiber yarn fabric of the present invention is a reinforcing fiber yarn fabric in which warp yarns and weft yarns made of reinforcing fiber yarns are interlaced with each other without being stopped, and is made of an auxiliary material made of non-awakening material. The yarn is linearly arranged in the longitudinal direction of the yarn on the selected warp yarn or weft yarn to form a direction indicating yarn. Here, it should be noted that the auxiliary yarn is made of a non-agitating material such as glass fiber that does not melt even at the thermosetting temperature of the matrix resin during molding.

  According to a preferred embodiment, the auxiliary yarn is arranged on the selected warp or weft in the approximate center of the yarn width, and is arranged linearly in the longitudinal direction of the warp or weft at intervals of 30 to 100 mm. Has been. The reinforcing fiber yarn is preferably a carbon fiber yarn.

  In the manufacture of reinforced fiber yarn fabrics, healds with mails in the upper and lower stages are used, auxiliary yarns that are made of non-awakening material and serve as direction indicating yarns are supplied from the upper stage of the healds, and reinforcing fiber threads are supplied from the lower stage. It is desirable to supply the auxiliary yarn so that the auxiliary yarn is arranged approximately at the center of the yarn width on the reinforcing fiber yarn.

  The auxiliary yarns are preferably arranged at intervals of approximately 30 to 100 mm. If it is less than 30 mm, the shear deformation performance of the woven fabric will be reduced, resulting in a non-fit woven fabric, and the auxiliary yarn setting work will increase, resulting in poor weaving preparation workability. If the interval is larger than 100 mm, the direction may not be recognized when cutting to a small size.

  Auxiliary yarns are supplied using healds with mails in the upper and lower two stages. Conventionally, since the reinforcing fiber yarn and the auxiliary yarn are supplied by being aligned with a heald having one mail, the auxiliary yarn is shifted between adjacent reinforcing fiber yarns, and it is difficult to recognize from the appearance.

  In the reinforcing fiber yarn fabric of the present invention, since the auxiliary yarn as the direction indicating yarn is arranged on the reinforcing fiber yarn at approximately the center of the yarn width, the reinforcing fiber yarn fabric or its prepreg is sized to a required size. When producing a composite molded body having a curved surface while cutting and bonding a plurality of the cut pieces along the curved surface, the direction of the reinforcing fiber yarn fabric can be easily recognized, and the predetermined laminated structure is ensured. can get. As a result, desired mechanical characteristics can be obtained even with a complex molded body having a complicated shape.

It is a partial top view of the reinforced fiber yarn fabric which concerns on one Embodiment of this invention. It is a perspective view of the mail part of the heald which has mail in the upper and lower two steps used for supply of the auxiliary yarn in the reinforced fiber yarn fabric of FIG. It is a perspective view of the mail part of a normal heald.

Below, an example of desirable embodiment of arrangement | positioning of the reinforcing fiber yarn fabric and auxiliary yarn of this invention is demonstrated, referring drawings.
FIG. 1 shows an example of the arrangement of auxiliary yarns. Reinforcing fiber yarns made of warp yarns a1, a2, a3, a4, a5,... And weft yarns b1, b2, b3, b4, b5,. A portion composed of the two weft yarns b1 and b2 constitutes one completed woven fabric structure, and the auxiliary yarn 3 is arranged at an arbitrary position of the warp yarn.

FIG. 2 is a perspective view of the mail portion of the heald that supplies the auxiliary yarn. The mail 2 is formed in two upper and lower stages. The auxiliary yarn 3 is arranged at approximately the center of the yarn width of the reinforcing fiber reinforced fiber yarn 1 passed through the upper mail 2a and passed through the lower mail 2b.
Since the auxiliary yarn 3 is a direction indicating yarn, it is not necessary to supply it to all the warp yarns, and the auxiliary yarn 3 is arranged within a range of 30 to 100 mm pitch in which the direction of the fabric can be recognized even if it is cut into small pieces.

Hereinafter, the present invention will be specifically described with reference to examples.
In the following embodiments, an example in which an auxiliary yarn is attached to the warp yarn is given, but an auxiliary yarn may be attached to the weft yarn. This type of reinforcing fiber yarn fabric is woven using, for example, a rapier loom. The weft insertion is performed by a not-shown weft insertion device of a rapier loom. In this weft insertion device, a weft yarn delivery head and a receiving head are usually fixed opposite to each other at the end of a rapier band driven by a pair of rapier wheels, and the weft yarn reciprocates in a contact and separation direction. And the receiving head are inserted into a weft insertion opening formed between the warp yarns. When the auxiliary yarn is attached on the weft yarn, an auxiliary yarn guide is disposed in the vicinity of the retreat limit position of the weft delivery head of the weft insertion device and above the center in the yarn width direction of the weft yarn supply path, The auxiliary yarn may be supplied onto the weft yarn through the auxiliary yarn guide. Even in other types of looms, as described above, an auxiliary yarn guide can be disposed immediately above the weft supply portion of the weft insertion device to supply the auxiliary yarn.

  Since no squeezing material is used as the auxiliary yarn 3, the warp yarns a1, a2, a3, a4, a5,... And the weft yarns b1, b2, b3, b4, b5,. All the reinforcing fiber yarn fabrics obtained are excellent in drape.

Carbon fiber yarns (Pyrofil TR50S 6L manufactured by Mitsubishi Rayon Co., Ltd.), which are reinforcing fiber yarns having 6,000 filaments, were used as warp yarns and weft yarns. Glass fiber (ECE225 1/2 4.4S: ECE225 1/0 1.0Z double twisted 4.4 times / 25 mm product manufactured by Nippon Electric Glass Co., Ltd.) was used as the auxiliary yarn. This auxiliary yarn is supplied through a normal heald mail in a state of being aligned at the center of the upper surface of the warp yarn at an interval of about 50 mm, and the weave density is 3.5 yarns / cm for both warp and weft. A plain weave with a basis weight of 288 g / m ² was woven.
Observation of the resulting woven fabric revealed that a portion of the auxiliary yarn arranged on the carbon fiber yarn and a portion displaced between the adjacent warp yarns were reinforced, but the drapeability was good and easy to handle. It was a yarn fabric.

2. A guide for supplying the auxiliary yarn above the weft supply position of the same warp and weft as in Example 1 is provided, and the weave density is adjusted for the warp and the weft while aligning the auxiliary yarn on the weft. A plain weave with 5 pieces / cm and a carbon fabric basis weight of 304 g / m ² was woven.
When the obtained woven fabric was observed, the auxiliary yarn was arranged on all the weft yarns, and the weft direction of the woven fabric could be easily recognized.

Weaving was performed in the same manner as in Example 1 except that the glass fiber 3 of the auxiliary yarn was supplied from the upper stage of the heald having the mail in two upper and lower stages, and the warp was supplied from the lower stage.
When the obtained woven fabric was observed, the auxiliary yarn was arranged at the center of the warp yarn width, and the warp direction of the woven fabric could be easily recognized.

Weaving was performed in the same manner as in Example 3 except that the glass fiber of the auxiliary yarn was supplied onto the warp yarn at intervals of approximately 200 mm.
When the obtained woven fabric was observed, the auxiliary yarn was arranged at the center of the warp yarn width, and the warp direction of the woven fabric could be easily recognized. However, when this carbon fiber woven fabric was cut into a 100 mm square, a carbon fiber woven fabric without auxiliary yarns was formed, and the direction of the fabric piece could not be recognized.

Comparative Example 1

Weaving was performed in the same manner as in Example 1 except that no auxiliary yarn was disposed.
When the obtained woven fabric was observed, the direction of the woven fabric piece could not be recognized because there was no auxiliary yarn serving as a direction indicating yarn.

DESCRIPTION OF SYMBOLS 1 Reinforcing fiber yarn 2 Mail 2a Upper mail 2b Lower mail 3 Auxiliary yarns a1, a2, a3, a4, a5, ... Warp yarns b1, b2, b3, b4, b5, ... Weft

Claims (5)

  Reinforced fiber yarn woven fabric in which the warp yarn and weft yarn of the reinforcing fiber yarn are interlaced with each other without being sealed, and the auxiliary yarn made of non-awakening material is linear in the longitudinal direction on the selected warp yarn or weft yarn Reinforced fiber yarn woven fabric that is arranged in the direction direction yarn.   The reinforcing fiber yarn fabric according to claim 1, wherein the auxiliary yarn is arranged on the selected warp or weft at approximately the center of the yarn width.   The reinforcing fiber yarn fabric according to claim 1, wherein the auxiliary yarns are linearly arranged in the longitudinal direction of the warp yarns or weft yarns at intervals of 30 to 100 mm.   The reinforcing fiber yarn fabric according to any one of claims 1 to 3, wherein the reinforcing fiber yarn is a carbon fiber yarn.   In a method for manufacturing a reinforced fiber yarn fabric in which warp yarns and weft yarns of reinforcing fiber yarns are interlaced with each other, a heald having a mail in two upper and lower stages is used, and a non-awakening material is formed from the upper stage of the heald to become a direction indicating yarn A method for producing a reinforced fiber yarn fabric, wherein an auxiliary yarn is supplied, a reinforcing fiber yarn is supplied from the lower stage, and the auxiliary yarn is arranged on the reinforcing fiber yarn at approximately the center of the yarn width.

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