JP3011285B2 - Cylindrical unidirectional reinforced fabric for fiber reinforced composite material and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing fabric for a fiber-reinforced composite material such as fiber-reinforced plastic (FRP), and more particularly to a tubular reinforcing fabric suitable for forming a tubular fiber-reinforced composite material. The present invention relates to a tubular fiber reinforced composite material for forming a fishing rod, a golf shaft, a tennis racket frame, a bicycle frame, or the like, which is formed using a tubular reinforcing fabric, and a method of manufacturing the tubular reinforcing fabric.

[0002]

2. Description of the Related Art In forming a tubular FRP constituting a fishing rod, a golf shaft, a tennis racket frame, a bicycle frame, or the like, a core material such as a rod-shaped foam, a rubber tube or a metal mandrel is formed into a cylindrical material made of reinforcing fibers. It is often inserted into a round braid, impregnated with resin, and then molded into a mold.

[0003] In this molding, if a normal round braid is used, the reinforcing fiber yarns are oriented only in the bias direction of ± α °, so that the torsional strength and rigidity of the tubular body are increased. Since the reinforcing fiber yarns are not oriented in the vertical direction, the bending strength and rigidity are small. The reinforcing fiber woven fabric may be cut as a reinforcement against bending, and wrapped around the braid so that the reinforcing fiber yarns are oriented in the longitudinal direction of the tubular body. bad. In addition, there is a problem that the surface of the tubular body is uneven at the wrap portion of the wound fabric, or a portion having a large amount of fiber is partially formed, so that a tubular body having uniform physical properties cannot be obtained.

On the other hand, a triaxial round braid in which reinforcing fiber yarns extend in a length direction and a bias direction of ± α ° is known, but although reinforcing fiber yarns are oriented in the longitudinal direction of a tubular body, Since the reinforcing fiber yarns in the three directions are interlaced with each other, the bending of the reinforcing fiber yarns becomes large, and stress concentration occurs when the FRP is formed, and the FRP having a large fiber volume content does not become heavy and has high strength. There was a problem that it could only be a small tubular body.

[0005] In the case of forming a tubular body, when a braid or a triaxial braid whose fibers are oriented in the above-mentioned normal bias direction is put on the core, the braid is made larger than the outer diameter of the core. When the braid is inserted into the core material, the braid once expanded must be manually corrected so as to be in close contact with the core material after insertion, and setting the braid to the core material is complicated. Further, in the case of a normal three-axis braid, when the braid is expanded in the radial direction, the length of the braid contracts in the opposite direction, so that the reinforcing fiber yarns in the longitudinal direction meander.

Further, since the fiber-reinforced composite material has extremely large anisotropy, sheet-shaped prepregs are laminated and formed so that the fibers are oriented in a predetermined direction. For example, in a golf shaft, a prepreg in which fibers are arranged in parallel in one direction with respect to a tapered mandrel is cut so that the fibers are directed in the axial direction of the shaft, and a bias direction of ± 45 ° with respect to the axial direction. A prepreg cut so as to face is prepared, and these are wound, for example, alternately around a mandrel, and are formed by heating and pressing. However, since the mandrel is tapered and the fibers of the prepreg are arranged in parallel, all of the fibers of the prepreg cut so as to face the axial direction of the shaft do not all face the axial direction, and the characteristics of the reinforcing fiber At present, it cannot be fully demonstrated. To solve such a problem, Japanese Patent Laid-Open No.
No. 0369 proposes a prepreg in which fibers are radially arranged, but the production of such a prepreg is troublesome, and it is difficult to orient the fibers with high accuracy.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a tubular reinforcing fabric and a high-performance tubular fiber reinforced composite material having good workability in forming a tubular body. An object of the present invention is to provide a method for producing a tubular reinforcing fabric.

[0008]

[MEANS FOR SOLVING THE PROBLEMS] To achieve this object
In the present invention,For fiber reinforced composite materialsTubularUnidirectional reinforced fabric
Is the warpTensile modulus of elasticity is 7,000 kg / mm ^Two More than
The reinforcing fiber yarn and weft are crimped yarn, and the crimped yarn is crimped
Characterized by being interlaced with reinforcing fiber yarns in a state
Consists of

The tubular fiber-reinforced composite material of the present invention is formed by using the above-mentioned tubular one - way reinforcing fabric for a fiber-reinforced composite material .

Furthermore fiber-reinforced composite material tubular aspect of the present invention
The manufacturing method of the directionally reinforced fabric has a tensile modulus of 7,000 k.
g / mm ² or more, the reed width of the warp made of reinforcing fiber yarn is set to 1.2 times or more and 2.0 times or less of the width of the woven fabric. It consists of a method of shrinking the weft into a crimped state.

The above-mentioned tubular reinforcing fabric and a method for producing the same will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the method for producing a tubular reinforcing fabric of the present invention. In FIG. 1, first, a reinforcing fiber yarn 2 serving as a warp is pulled out from a package 1 (the number of which is equal to the number of warp yarns), and entangled with at least four healds a, b, c, and d at a joint 3, 4, 5, and 6. Arrange them so that they do not match. Next, the reinforcing fiber yarn 2 passed through each heddle is put into the reed feather, and the arrangement is a, b, c, d,
a, b, c, d,... are passed through the reed 7 in order, the heald b is raised, the healds a, c, d are lowered, and the crimped yarn as the weft is inserted with the shuttle 12 and beaten. Then, healds a, b, and d are raised, heald c is lowered, the next crimped yarn as a weft is inserted and beaten, and then heald d is raised, and healds a, b, and c
Then, the next crimped yarn as the weft is inserted and beaten, then the healds b, c and d are raised, and the heald a is lowered, and the next crimped wire as the weft is inserted and beaten. By repeating these operations sequentially, the outer fabric 8 made of the reinforcing fiber yarns passed through the healds b and d, and the lining 9 made of the reinforcing fiber yarns passed through the healds a and c.
To form a tubular woven fabric having a flat structure. This is taken up by a pair of take-up rollers 10 and 11, as shown in FIG. 2, to form a reinforcing fiber yarn 2 as a warp and a crimped yarn 1 as a weft.
Thus, a tubular reinforcing fabric of the present invention having a flat structure is obtained.

When the wound crimped yarn as the weft is inserted with the shuttle 12, the beating is performed in a state where the crimped yarn is stretched by the unwinding resistance when the weft is unwound from the package,
Inserted as weft. When the reinforcing fiber yarn 2 is put into the reed feathers, the width of the reed must be at least 1.2 times the width of the fabric, and
If it is set to twice or less, the reinforcing fiber yarn and the crimped yarn are interlaced by beating and from the fabric width immediately after forming the fabric structure,
Before winding, the width of the woven fabric is reduced by the crimping of the crimped yarn. Therefore, the diameter can be increased by at least 20 to 100% by increasing the crimp of the woven fabric after weaving.

In the above-described manufacturing method, the case where the reinforcing fiber yarn of the warp and the crimped yarn of the weft have a flat structure has been described. However, the present invention is not limited to this. May be.

In order for the reinforcing fiber yarn used in the present invention to exhibit the performance as a tubular body constituting a fishing rod, a golf shaft, a tennis racket frame, a bicycle frame and the like,
That tensile elastic modulus is 7,000 kg / mm ² or more
It is necessary, and the tensile strength is preferably 200 kg / mm ² or more. For example, there are carbon fiber yarn, glass fiber yarn, polyaramid fiber yarn and silicone carbide fiber yarn. Above all, the tensile modulus is 20,000kg / mm
Carbon fiber yarns having a tensile strength of at least ² and a tensile strength of at least 200 kg / mm ² are preferred because the weight of the sports and leisure goods can be reduced. The fineness of the reinforcing fiber yarn is 500 to
20,000 denier, more preferably 1,500 to 1,
It is 0000 denier. Further, the reinforcing fiber yarn constituting the tubular reinforcing fabric of the present invention is not limited to one kind. For example, in order to have a damping property as an FRP tubular body, for example, carbon fiber yarn and polyaramid fiber A yarn or a carbon fiber yarn and a vinylon fiber yarn can be used in combination.

The crimped yarn of the weft holds the reinforcing fiber yarns integrally, and when the fabric is put on the core during molding, the fabric is expanded and the core is inserted, and then the fabric comes into close contact with the core. In this way, the outer ring contracts in the radial direction. When the woven fabric is located on the inner surface side of the core, the woven fabric plays a role of extending in the radial direction so that the woven fabric comes into close contact with the inner surface of the core. Further, in the case of following a ring-shaped object such as a tennis racket frame, it plays a role of contracting or extending so as to be in close contact with the ring-shaped core material.
In the tubular reinforcing fabric of the present invention, since the crimped yarn is used as the weft, the fabric can be easily contracted or elongated in the radial direction at the time of molding, and the fabric can be easily and accurately cored. It can adhere to the material.

Examples of such a crimped yarn include a false twisted yarn obtained by processing a multifilament yarn or a monofilament yarn made of a thermoplastic resin such as a nylon resin, a polybutylene terephthalate resin, or a polyester resin. For the false twisted yarn, for example, a twisted yarn obtained by subjecting a nylon fiber yarn, a polybutylene terephthalate fiber yarn, or a polyester fiber yarn to a strong twist of about 500 to 5,000 turns / m is heat-set at 160 to 240 ° C. Thereafter, it is cooled to room temperature, and this twist is obtained by untwisting about 0 times. Since the form is fixed in a twisted state, when it is untwisted, a wool-like crimp develops. False twisted yarn is in a crimped state when tension is not applied, and when tension is applied to it, the length of the crimped yarn is extended, but when it is in no tension, it returns to the original state. It has the property of shrinking. Such properties of the false twisted yarn are as follows: Crimping ratio = [length at load (0.1 g / denier) −length at initial load (0.02 g / denier)] / [initial load (0 .02g / denier)
Although represented as × 100 (%), the crimping ratio of the false twisted yarn used in the present invention is preferably 100% or more. 10
If it is less than 0%, the radial elongation of the woven fabric is reduced,
Insertion into the core material becomes difficult. Further, after insertion into the core material, the amount of contraction or elongation in the radial direction is reduced, and the adhesion to the core material is deteriorated.

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

The radial expansion of the woven fabric of the present invention is 20% or more at a load of 100 g per 10 mm width in the radial direction of the woven fabric in a state where the tubular woven fabric is folded so as to be creased in the length direction. Is preferred. When it is less than 20%, the elongation of the woven fabric in the radial direction is small, and it becomes difficult to insert it into the core material. After insertion into the core material, the amount of shrinkage in the radial direction is reduced, and the adhesion to the core material is deteriorated.

According to the present invention, using the fabric of the present invention,
For example, an FRP tubular body can be manufactured, for example, 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 appropriately inserted into the core material so that the braids are alternately layered. This is installed in the cavity formed by the male and female molds,
After sealing the male mold and the female mold, a thermosetting resin such as an epoxy resin, an unsaturated polyester resin or a phenol resin is injected into the cavity, and the resin is cured by heating. Then, if necessary, by extracting the core material,
A tubular FRP is obtained.

Further, by using the woven fabric of the present invention, even when forming a tapered tubular body such as a fishing rod or a golf shaft, the crimped yarn is uniformly stretched when the woven fabric is expanded. When put on, the reinforcing fiber yarns oriented in the length direction can be oriented at equal intervals in the circumferential direction, and all the reinforcing fiber yarns can be oriented in the ridge direction of the tubular body, so that the performance of the reinforcing fibers can be fully exhibited. Can be.

[0021]

As described above, the woven fabric of the present invention is
The warp yarn is a reinforcing fiber yarn having a tensile modulus of elasticity of 7,000 kg / mm ² or more , and the weft yarn is a wound crimp yarn, and is a tubular reinforcing woven fabric in which the crimped yarn intersects with the reinforcing fiber yarn. As a result, the fiber can be oriented in the direction of the ridge line of the tubular body without wrapping, and a tubular fiber-reinforced composite material having excellent physical properties can be obtained. In addition, even when the woven fabric is inserted into the core material during molding, the woven fabric can be naturally and satisfactorily adhered to the core material after the insertion. A tubular composite material is obtained.

Further, since the crimped yarns are organized with the reinforcing fiber yarns in a crimped state, the reinforcing fiber yarns in the length direction of the woven fabric are arranged densely so that the yarns come into contact with each other due to the contraction of the crimped yarns. As a result, a tubular fiber-reinforced composite material having a large fiber volume content is obtained.

Further, the reed width of the warp is set to 1.50 of the fabric width.
Since it is woven using a wound crimp as a weft, the tubular reinforcing fabric in which the weft is crimped can be reliably and easily obtained by shrinking the wound crimp. .

[Brief description of the drawings]

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Package 2 Reinforcement fiber yarn (warp) 3, 4, 5, 6 Overall 7 Reed 8 Outer material 9 Lining 10, 11 Winding roller 12 Shuttle 13 Winding crimped yarn (weft) a, b, c, d Heald

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-165040 (JP, A) JP-A-2-74321 (JP, A) JP-A-60-25774 (JP, U) US Patent 4,840,024 (US) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) D03D 1/00-1/04

Claims (3)

(57) [Claims] 1. The warp yarn has a tensile modulus of 7,000 kg / m.
m ² or more reinforcing fiber yarns, the weft is a wound contraction yarn, fiber-reinforced composite material tubular unidirectional reinforcing fabric, characterized in that Makichijimiito is interlaced with reinforcing fiber yarns while crimped . 2. The cylindrical one for the fiber reinforced composite material according to claim 1.
A tubular fiber reinforced composite material using a directional woven fabric . 3. A tensile modulus 7,000 kg / mm ² or more
The reed passing width of the warp composed of the above reinforcing fiber yarn is set to 1.2 times or more and 2.0 times or less of the fabric width, and after weaving using a wound crimp as the weft, the weft is contracted by the wound crimp. Cylindrical unidirectional reinforcing weave for fiber-reinforced composite material , characterized by crimping
Method of manufacturing a product .