JPH04327241A - Cylindrical reinforcing woven fabric and production thereof - Google Patents

Abstract

PURPOSE:To provide a cylindrical reinforcing woven fabric having good workability on the formation of a FRP cylinder, the cylindrical FRP having high physical properties, and a method for producing the cylindrical reinforcing woven fabric. CONSTITUTION:A cylindrical reinforcing woven fabric characterized by using reinforcing fibers and twisting fibers as warps (2) and wefts (13), respectively, the twisting fibers (13) being crossed with the reinforcing fibers (2) in a twisted state. A cylindrical FRP using the reinforcing woven fabric. A method for producing the cylindrical woven fabric characterized by weaving the reinforcing fibers and the twisting fibers as the warps (2) and the wefts (13) under a condition that the reeding width of the warp (2) is 1.2 to 2.0 times the width of the woven fabric, and subsequently twisting the twisting fibers (13) into the twisted state.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to reinforcing fabrics for fiber-reinforced composite materials such as fiber-reinforced plastics (FRP), and particularly to cylindrical reinforcing fabrics suitable for molding tubular fiber-reinforced composite materials. The present invention relates to a tubular fiber-reinforced composite material molded using a cylindrical reinforcing fabric, which constitutes fishing rods, golf shafts, tennis racket frames, bicycle frames, etc., and a method for manufacturing the cylindrical reinforcing fabric.

0002

[Prior Art] When molding tubular FRP that constitutes fishing rods, golf shafts, tennis racket frames, bicycle frames, etc., core materials such as rod-shaped foam, rubber tubes, and metal mandrels are used to mold tubular FRP made of reinforcing fibers. It is often inserted into a round braid, impregnated with resin, and then placed in a mold and molded.

[0003] When a normal round braid is used in this forming, the reinforcing fiber threads are oriented only in the bias direction of ±α°, which increases the torsional strength and rigidity of the tubular body, but the length of the tubular body increases. Since the reinforcing fibers are not oriented in the horizontal direction, the bending strength and rigidity are low. In order to provide reinforcement against bending, a reinforcing fiber fabric is sometimes cut and wrapped around a braid so that the reinforcing fiber threads are oriented in the length direction of the tubular body, but it is difficult to fix the fabric, and the fabric may unravel, resulting in poor workability during molding. bad. Further, there is a problem that the surface of the tubular body becomes uneven at the lap portion of the wound fabric, and there are parts with a large amount of fiber, making it impossible to obtain a tubular body with uniform physical properties.

On the other hand, triaxial circular braids in which reinforcing fiber threads extend in the longitudinal direction and the bias direction of ±α° are known, but although the reinforcing fiber threads are oriented in the longitudinal direction of the tubular body, Since the reinforcing fiber yarns in three directions intersect with each other, the bending of the reinforcing fiber yarns becomes large, and stress concentration occurs when FRP is made.FRP does not have a high fiber volume content, and it is heavy and has low strength. The problem was that it only formed into a small tubular body.

[0005] Furthermore, when forming a tubular body, when a core material is covered with a braid or a triaxial braid with fibers oriented in the normal bias direction, the braid is made to have a diameter larger than the outer diameter of the core material. However, after insertion, the expanded braid must be manually corrected so that it comes into close contact with the core material, and setting the braid to the core material is complicated. Further, when a normal triaxial braid is expanded in the radial direction, the length direction conversely contracts, so there is a problem that the reinforcing fiber threads in the length direction meander.

Furthermore, since fiber-reinforced composite materials have extremely high anisotropy, sheet-like prepregs are laminated and molded so that the fibers are oriented in a predetermined direction. For example, golf shafts are made by cutting prepreg in which fibers are arranged parallel to one direction onto a tapered mandrel so that the fibers are oriented in the axial direction of the shaft, and in a bias direction of ±45° with respect to the axial direction. Prepare prepregs cut to face the surface, wrap them alternately around a mandrel, and heat and pressurize them to shape them. However, since the mandrel is tapered and the prepreg fibers are arranged in parallel, all of the prepreg fibers that are cut to face the axial direction of the shaft do not face in the axial direction, which affects the characteristics of the reinforcing fibers. The current situation is that they are not able to demonstrate their full potential. In order to solve this problem, Japanese Patent Laid-Open No. 51-8
No. 0369 proposes a prepreg in which fibers are arranged radially, but manufacturing such a prepreg is troublesome, and it is difficult to precisely orient the fibers.

[0007]

[Problems to be Solved by the Invention] An object of the present invention is to solve the above-mentioned problems and to provide a cylindrical reinforcing fabric with good workability in forming a tubular body, a tubular fiber reinforced composite material with high physical properties, and the like. An object of the present invention is to provide a method for manufacturing a cylindrical reinforcing fabric.

[0008]

[Means for Solving the Problems] In order to achieve this object, the cylindrical reinforcing fabric of the present invention has the warp being a reinforcing fiber yarn, the weft being a crimped yarn, and the crimped yarn is in a crimped state. It is characterized by being interlaced with reinforcing fiber threads.

Further, the tubular fiber-reinforced composite material of the present invention is molded using the above tubular reinforcing fabric.

Further, in the method for manufacturing a cylindrical reinforcing fabric of the present invention, the reed width of the warp made of reinforcing fiber yarn is set to 1 of the fabric width.
．． The weft is 2 times or more and 2.0 times or less, and after weaving using a crimp yarn as the weft, the weft is brought into a crimp state by contraction of the crimp yarn.

The above-mentioned cylindrical reinforcing fabric and its manufacturing method will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the method for producing a cylindrical reinforcing fabric of the present invention. In FIG. 1, first, the reinforcing fiber yarn 2 serving as the warp is pulled out from the package 1 (there are as many as the warp yarns), and at least four
Line up the heddles 3, 4, 5, and 6 of heddles a, b, c, and d so that they do not intertwine with each other. Next, the reinforcing fiber threads 2 passed through each heddle are put into the reed feathers, and the arrangement is a, b, c, d, a.
, b, c, d, etc. through the reed 7,
Raise heald b, lower heddles a, c, and d, insert the weft barrel crimped yarn with the shuttle 12, beat the reed, and then move healds a and b.
, raise heald d, lower heddle c, insert the next weft barrel, and beat it, then raise heald d, lower healds a, b, and c, and insert the next weft barrel, Beating the reed, then heddle b,
Raise c and d, lower heddle a, insert the next weft yarn, and beat it. By sequentially repeating these operations, the outer fabric 8 made of reinforcing fiber threads passed through the healds b and d
Then, a flat-woven cylindrical fabric is obtained, which is formed by a lining 9 made of reinforcing fiber threads passed through healds a and c. By winding this up with a pair of winding rollers 10 and 11, as shown in FIG. 2, a cylindrical reinforcing fabric of the present invention in which the reinforcing fiber yarn 2 as the warp and the curled yarn 13 as the weft are flat-woven is produced. can get.

[0012] When the crimped yarn serving as the weft is inserted by the shuttle 12, the unwinding resistance when the weft yarn is unwound from the package causes the crimped yarn to be beaten in a stretched state.
Inserted as a weft. When inserting the reinforcing fiber yarn 2 into the reed, the reed width should be at least 1.2 times the fabric width, 2.0
If the width is less than double, the width of the fabric immediately after the reinforcing fiber yarn and the crimped yarn are interlaced by beating to form a fabric structure,
The width of the fabric shrinks due to the crimping of the crimped yarn before it is wound. Therefore, it is possible to increase the diameter by at least 20 to 100% by stretching the crimps of the fabric after weaving.

[0013] In the above manufacturing method, the reinforcing fiber yarn of the warp and the curled yarn of the weft have been explained in a flat weave, but the present invention is not limited to this, and it may be a twill weave or a satin weave. It's okay.

In order for the reinforcing fiber yarn used in the present invention to exhibit its performance as a tubular body constituting fishing rods, golf shafts, tennis racket frames, bicycle frames, etc.,
It is preferable that the tensile modulus is 7,000 kg/mm2 or more and the tensile strength is 200 kg/mm2 or more. Examples include carbon fiber yarn, glass fiber yarn, polyaramid fiber yarn, and silicone carbide fiber yarn. Among these, carbon fiber yarns having a tensile modulus of 20,000 kg/mm 2 or more and a tensile strength of 200 kg/mm 2 or more are preferred because they can reduce the weight of the sports and leisure goods mentioned above. Further, the fineness of the reinforcing fiber yarn is 500 to 20,000 deniers, more preferably 1,500 to 10,000 deniers. Furthermore, the reinforcing fiber yarns constituting the cylindrical reinforcing fabric of the present invention are not limited to one type; for example, in order to provide the FRP tubular body with damping properties, for example, carbon fiber yarns and polyaramid fibers can be used. Yarn or carbon fiber yarn and vinylon fiber yarn can be used together.

[0015] The crimped yarn of the weft holds the reinforcing fiber yarn together, and when the woven fabric is placed over the core material during forming, the woven fabric is spread out and the core material is inserted, and then the woven fabric adheres to the core material. It plays the role of contracting in the radial direction. In addition, when the woven fabric is placed on the inner surface of the core material, the woven fabric serves to stretch in the radial direction so as to be in close contact with the inner surface of the core material. Furthermore, when it is placed along a ring-shaped object such as a tennis racket frame, it plays the role of shrinking or expanding so as to come into close contact with the ring-shaped core material. In the cylindrical reinforcing fabric of the present invention, since curled yarn is used as the weft, the fabric can be easily contracted or expanded in the radial direction during forming, and the fabric can be easily and accurately cored. It can be attached closely to the material.

Examples of such crimped yarns include false twisted yarns obtained by processing multifilament yarns and monofilament yarns made of thermoplastic resins such as nylon resin, polybutylene terephthalate resin, and polyester resin. False-twisted yarn, for example, is made by first twisting nylon fiber yarn, polybutylene terephthalate fiber yarn, or polyester fiber yarn at a rate of about 500 to 5,000 times/m, and heat setting the twist at 160 to 240°C. It is then cooled to room temperature and untwisted to approximately 0 twists. Since the shape is fixed in the twisted state, when it is untwisted, a woolly-like curl appears. False-twisted yarn is in a crimped state when no tension is applied, and when tension is applied to it, it stretches by the length of the crimped yarn, but when no tension is applied, it returns to its original state. It has the property of shrinking. These properties of false twisted yarn are as follows: crimp ratio = [length at load (0.1 g/denier) - length at initial load (0.02 g/denier)] / [initial load (0 .02g/denier) length]×
Although expressed as 100 (%), the crimp ratio of the false twisted yarn used in the present invention is preferably 100% or more. 100
If it is less than %, the radial elongation of the fabric will decrease, making it difficult to insert it into the core material. Furthermore, after insertion into the core material, the amount of contraction or expansion in the radial direction decreases, resulting in poor adhesion to the core material.

[0017] Since the crimped yarn used in the present invention cannot essentially serve as a reinforcing material in the fiber-reinforced composite material, the smaller the amount used, the better. The fineness of the curled yarn is preferably 50 to 500 deniers, more preferably 100 to 300 deniers. If it is less than 50 denier, the shrinkage force in the radial direction will be small, and if it exceeds 500 denier, the amount of crimped yarn will be large, and the volume content of reinforcing fibers in the composite material will be small.

The elongation in the radial direction of the fabric of the present invention is 20% or more when the cylindrical fabric is folded so that a crease is formed in the length direction, and a load of 100 g per 10 mm width is applied in the radial direction of the fabric. is preferred. If it is less than 20%, the radial elongation of the fabric will be small, making it difficult to insert it into the core material. Furthermore, after insertion into the core material, the amount of radial contraction decreases, resulting in poor adhesion to the core material.

[0019] Using the fabric of the present invention, according to the present invention,
For example, an FRP tubular body can be manufactured as follows. The woven fabric of the present invention alone, or the woven fabric of the present invention and a tubular round braid in which reinforcing fiber yarns are arranged only in the bias direction, are inserted into the core material as appropriate so as to alternately form a layered structure. This is placed in the cavity formed by the male and female molds, and after sealing the male and female molds, a thermosetting resin such as epoxy resin, unsaturated polyester resin, or phenolic resin is injected into the cavity and heated. to harden the resin. Thereafter, by removing the core material if necessary, a tubular FRP can be obtained.

Furthermore, by using the fabric of the present invention, when forming tapered tubular bodies such as fishing rods and golf shafts, the crimped yarn stretches uniformly when the fabric is expanded, so it can be inserted into the core material or When covered, the reinforcing fiber threads oriented in the length direction can be spaced at equal intervals in the circumferential direction, and all the reinforcing fiber threads can be oriented in the ridgeline direction of the tubular body, so that the performance of the reinforcing fibers can be fully demonstrated. Can be done.

[0021]

[Effects of the Invention] As explained above, the fabric of the present invention has
Since this is a cylindrical reinforcing fabric in which the warp is a reinforcing fiber yarn and the weft is a crimped yarn, and the crimped yarn intertwines with the reinforcing fiber yarn in a crimped state, there are wrap stitches in the direction of the ridgeline of the tubular body. Fiber orientation is possible in the absence of porosity, and a tubular fiber-reinforced composite material with excellent physical properties can be obtained. In addition, even if the fabric is inserted into the core material during molding, the fabric can be naturally and well adhered to the core material after insertion, which not only improves workability but also prevents the reinforcing fibers from being disarrayed and creates a homogeneous structure. A tubular composite material is obtained.

Furthermore, since the crimped yarn is organized with the reinforcing fiber yarn in a crimped state, the reinforcing fiber yarn in the length direction of the fabric is arranged so densely that the yarns come into contact with each other due to the contraction of the crimped yarn. This results in a woven fabric with a high fiber volume content, resulting in a tubular fiber-reinforced composite material with a high fiber volume content.

Furthermore, the reeding width of the warp threads is set to 1.0% of the fabric width.
Since it is 2 times or more and 2.0 times or less, and the weft is woven using a crimped yarn, it is possible to reliably and easily obtain a cylindrical reinforcing fabric in which the weft is in a crimped state due to the shrinkage of the crimped yarn. .

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an example of a method for manufacturing a cylindrical reinforcing fabric of the present invention.

FIG. 2 is a schematic cross-sectional view showing an example of a cylindrical reinforcing fabric of the present invention.

[Explanation of symbols]

1 Package 2 Reinforcement fiber yarn (warp) 3, 4, 5, 6 serpent 7. Reed 8 Outer material 9. Lining 10, 11 Take-up roller 12 Shuttle 13　Wrapped yarn (weft) a, b, c, d heddle

Claims (3)

[Claims] 1. A cylindrical reinforcing fabric characterized in that the warp is a reinforcing fiber yarn, the weft is a crimped yarn, and the crimped yarn intersects with the reinforcing fiber yarn in a crimped state. 2. A tubular fiber-reinforced composite material comprising the tubular reinforcing fabric according to claim 1. [Claim 3] The reed width of the warp made of reinforcing fibers is
Cylindrical reinforcement characterized in that the width of the fabric is 1.2 times or more and 2.0 times or less, and after weaving using a crimp yarn as the weft, the weft is brought into a crimp state by contraction of the crimp yarn. Method for manufacturing textiles.