JPH0450901B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Fields> The present invention is applicable to reinforcing sheets made of various synthetic resin composites, molded into tubular shapes, and used for golf clubs, gateball stakes, shafts such as badminton and tennis rackets, ski stocks, etc. The present invention relates to a fiber-reinforced sheet that can be used for.

<Conventional technology> Carbon fiber composites made of synthetic resin are lightweight, have high strength, and are highly elastic, so they are used in golf shafts, fishing rods, ski stocks, handles for various tools, and other industrial uses. It is used in transportation-related applications, and new uses are being developed.

<Problems to be Solved by the Invention> From the perspective of impact resistance, composites made mainly of carbon fiber can also be damaged by strong impacts.
This includes the problem that the carbon fibers may break or break. In particular, carbon fiber itself has drawbacks in terms of bending durability and impact resistance, which has been a problem when used as a material for shafts and the like.

<Means for Solving the Problems> Therefore, the fiber-reinforced sheet of the present invention was developed to solve the problems of carbon fibers by integrating carbon fibers with other fibers.

Its structural feature is that a laminate of one layer of carbon fiber filament, a layer of synthetic fiber filament, and a layer of synthetic fiber paper is impregnated with epoxy resin. The laminate referred to here may be one in which one carbon fiber filament layer, a synthetic fiber filament layer, and a synthetic fiber paper layer are sequentially laminated as shown in Figure 1a, or a synthetic fiber as shown in Figure 1b. A filament layer, a carbon fiber filament layer 1, and a synthetic fiber paper layer are laminated in sequence, or a layer in which synthetic fiber filaments and carbon fiber filament 1 are alternately arranged and a synthetic fiber paper layer as shown in Fig. 1c. Furthermore, as shown in FIG. 1d, there may be a layer consisting of a mixture of synthetic fiber filament and carbon fiber filament 1, and a layer of synthetic fiber paper. Synthetic fiber filaments include vinylon, nylon, polyester, acrylic, aramid fibers (trade name: Kevlar), among others, vinylon filament is preferred, and it is preferable to use vinylon paper as the synthetic fiber paper.

<Function> The fiber-reinforced sheet with the above structure has the advantages of carbon fiber, which is lightweight, high strength, and highly elastic, as well as the synthetic fiber filament and synthetic fiber paper, which exhibit folding and impact resistance. This improves the impact resistance of the composite and improves the difficulty of workability.

The present invention will be explained in detail below with reference to Examples.

Example 1 Carbon fiber filament 1 thinly spread in a planar shape
Vinylon filament 2 (1200 denier x 3, manufactured by Kuraray Co., Ltd., trade name Cremona) is placed in a layer on the layer (7μ x 6000 pieces, manufactured by Toray Industries, Inc., trade name: Trading Card) as a synthetic fiber filament. The epoxy resin is impregnated and supplied onto vinylon paper 3 (thickness 50 μm, manufactured by Nakao Paper Co., Ltd., trade name: Eslon), squeezed and pressurized between rollers, wound onto release paper, and printed. A fiber reinforced sheet of the invention was obtained.

After forming such a laminate into a sheet as shown in Fig. 2 and wrapping it around a core metal in five layers, a polypropylene tape was wrapped under pressure on the surface and a heat treatment furnace (example of construction, 1986-110 (see issue).
After cooling, the core metal was removed, and as shown in Figure 3, a tubular body with a multilayer structure consisting of vinylon paper, carbon fiber, and vinylon fiber as repeating units was obtained, making it ideal for the shaft of a golf club. It became something. In addition, we also supply shafts for badminton and tennis rackets, gateball stands, etc.
It has also become suitable for sports equipment such as ski stocks, table tennis rackets, and shinai for Kendo, fishing rods, and antennas.

Example 2 Using the same material as in the previous example, vinylon paper 3
First, a carbon fiber filament 1 is placed on top, and then a vinylon filament 2 is laminated in layers, and a fiber-reinforced sheet of a laminate as shown in FIG. Created.

As shown in Figure 4, this composite sheet toy is
A sheet of carbon fiber impregnated with an epoxy resin was laminated, the resulting sheet was wound around a core metal, and heat treated in a heat treatment furnace in the same manner as in the previous example.

After cooling, the core metal was removed, and as shown in Figure 5, a carbon fiber layer, vinylon fiber layer,
A tubular body with a multilayer structure having carbon fiber/vinylon paper layers as repeating units was obtained.

Like the tubular body obtained in the previous example, this tubular shape is also suitable for shafts of various tools.

<Effects of the Invention> The fiber-reinforced sheet of the present invention as detailed above compensates for the flexibility and toughness that are lacking in the case of carbon fiber alone, and can have strength, elasticity, flexibility, and toughness depending on the purpose of use. The effect was obtained.

[Brief explanation of the drawing]

FIGS. 1a to 1b are longitudinal sectional views of embodiments of the fiber reinforced sheet of the present invention. 2 and 4 are plan views of the sheet. 3 and 5 are end cutaway perspective views of a tubular body made using the fiber-reinforced sheet of the present invention. 1... Carbon fiber filament, 2... Vinylon filament, 3... Vinylon paper.

Claims (1)

[Scope of Claims] 1. A fiber-reinforced sheet obtained by impregnating a laminate of a carbon fiber filament layer, a synthetic fiber filament layer, and a synthetic fiber paper layer with an epoxy resin. 2. The fiber-reinforced sheet according to claim 1, wherein the laminate is formed by sequentially laminating a carbon fiber filament layer, a synthetic fiber filament layer, and a synthetic fiber paper layer. 3. The fiber-reinforced sheet according to claim 1, wherein the laminate is formed by sequentially laminating a synthetic fiber filament layer, a carbon fiber filament layer, and a synthetic fiber paper layer. 4 The laminate consists of two layers: a layer in which synthetic fiber filaments and carbon fiber filaments are alternately arranged, and a synthetic fiber paper layer.
The fiber-reinforced sheet according to claim 1, which comprises a layer. 5. The fiber-reinforced sheet according to claim 1, wherein the laminate comprises two layers: a layer in which synthetic fiber filaments and carbon fiber filaments are mixed and a synthetic fiber paper layer. 6. The fiber reinforced sheet according to any one of claims 1 to 5, wherein the synthetic fiber filament is a vinylon filament. 7. The fiber reinforced sheet according to any one of claims 1 to 5, wherein the synthetic fiber paper is vinylon paper.