JPS61185280A - Production of racket frame - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing racket frames for tennis, badminton, squash, etc. More specifically, the present invention relates to a method for manufacturing racket frames for tennis, badminton, squash, etc. It's about how to do it.

[Conventional technology]

Conventional tennis racket frames, for example, have been manufactured by processing wood, but the strength is not uniform, meaning there are some areas where the strength is poor, and they are not durable and are relatively heavy. There were drawbacks such as increased size. Recently, it has become necessary to widen the so-called sweet area and increase the frame area to improve ball control, and to achieve this, there has been a demand for frames to be made of strong material and lightweight. . Since racket frames made of processed wood cannot meet these demands, frames made of hollow light alloys or core materials wrapped around reinforcing fibers have been developed. When manufacturing a racket frame by wrapping reinforcing fibers around the outer circumference of a core material, the core material is inserted into a tube-shaped tube of reinforcing fibers, and then the racket frame is manufactured by heating and pressurizing it with a mold. was being carried out.

(Problem to be solved) In a method of inserting a core material into a tube-shaped reinforcement 1M, a tube-shaped reinforcement I! having an inner diameter almost the same as the outer circumference of the core material is used. If the core material was forcibly inserted into the cloth, the orientation of #AM would be disturbed by the core material, and as a result, there was a risk that areas with non-uniform strength would be created. In addition, if the inner diameter of the tube-shaped object is considerably larger than the outer diameter of the core material, the core material can be inserted smoothly, but the wrapping of the auxiliary 2A* miscellaneous core material will be loose and the strength This had the disadvantage that products were manufactured that were inferior in both physical and external appearance. Furthermore, a method was developed in which a sheet of reinforced I1M was wrapped around the core material, but this method was cumbersome and was disadvantageous in that the seams were conspicuous in order to achieve a beautiful finished appearance. .

Therefore, the orientation of the reinforcing fibers wrapped around the core material can be made uniform, and the reinforcing fibers can be wrapped tightly around the core material without any gaps. Moreover, it can be easily wrapped around the core material, and there is no risk of the fibers getting caught in the mold. This invention was developed for the purpose of providing a method for manufacturing a racket frame with a clean finish.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a method for manufacturing a racket frame in which reinforcing fibers are wrapped around the outer periphery of a core material, the method comprising: transporting the core material in one direction; This process consists of the steps of wrapping a large number of continuous reinforcing fibers around the core material, and setting the core material wrapped around the reinforcing fibers in a mold along the shape of the racket frame and heating and pressurizing it.

(Function) According to the present invention, the reinforcing fibers wrapped around the outer periphery of the core material are formed as the outer layer of the core material while the core material is being transported in one direction, so that the reinforcing fibers are wrapped around the core material in the following manner: The density, orientation angle, number of plies, etc. can be adjusted as appropriate, and can be easily adjusted depending on the intended racket frame.

In addition, a large number of continuous reinforcements I! on the outer periphery of the core material! It is possible to store it as a single bar with a string wrapped around it, and then heat and pressurize it with a mold to manufacture it into the shape of a racket frame.

〔Example〕

Preferred embodiments of the present invention will be described below with reference to the drawings.

In the illustrated embodiment, carbon 1 is used as the reinforcing wire 1111.
11N<Trading card (trademark) Ta2O-60 manufactured by Toshi Co., Ltd.
00) onto multiple bobbins 2..., 96
Set it on the main blader (S upper machine).

Foamed polyurethane (specific gravity 0.06) is cut to create a core material 3 with a length of 1°5 cm. After wrapping a predetermined number of glass cloth prepregs 4 around this core material 3, it is passed through a braider and then The carbon fibers are knitted at a speed of /mln. The knitted material is impregnated with epoxy resin by heating it to 30°C. Zarani edition.

The fabric was knitted in the same way through a braider at different angles, and then impregnated with epoxy resin. An epoxy resin film for prepreg is wrapped around the core material 3 made of woven carbon fibers in the form of a tape or bag, and the number and angle of the woven fibers are varied and the carbon 1iAH is woven through a braider to create a rod-like material suitable for similar purposes. Frame materials can also be prepared. The obtained rod-shaped frame material was set in a mold controlled at 170°C along the shape of the racket frame, and press-molded with a surface pressure of 80 kg/d (heating time 1).
5 minutes).

Although carbon fiber is used as the reinforcing fiber 1, other materials such as aramid fiber (trademark) and glass IIIF can also be used, and it is also possible to mix two or more of these fibers and wrap them around the core material 3. Material and orientation of reinforcing fiber 1,
The braai number is 1 for the racket frame to exhibit strength.
This is an important point. In addition, the reinforcing fibers 1 are wrapped around the core material 2 in a cloth (plain weave,
Satin weave, etc.), UD (unidirectionally aligned) single braid (bag-like fabric), etc. can be adopted. In addition, the reinforcing effect of the reinforcing layer 1 is very effective, especially since the outermost layer is a part that undergoes a large amount of repeated deformation. It is necessary to ensure strength with the rope. Therefore, the reinforcing fibers 1 wrapped around the core material 3 are continuous reinforcement I! It is important that it is thick. Especially reinforcement I!
When the fiber form of the fiber 1 is mIl, the balance in the circumferential direction and the axial direction is maintained.

The orientation angle of the reinforcing fibers 1 wound around the core material 3, the density of mesh between the fibers, the number of braids, etc. can be adjusted as appropriate. If the angles of the wrapping of the reinforcement 1111i1 are uniform, the strength will be increased, and the number of braises can be reduced, which is extremely effective for weight reduction.

It should be noted that the core material 3 is also a continuous long material, and the reinforcing fibers 1 are wound around it, that is, the frame material is wound around a roller or the like and cut to an appropriate length when heated and pressurized with a mold. As the core material 3, hollow steel, aluminum alloy, etc. can also be used.

〔effect〕

As explained above, according to the present invention, it is possible to easily manufacture a racket frame that has a large frame area to increase the sweet area and improve ball control, and also has sufficient strength. Thus, a racket frame that is lightweight can be obtained. In the conventional method of passing a core material through a tube made of woven reinforced flAH and drawing it at both ends, the orientation of the reinforcing fibers was not constant and there were many variations in performance, but the present invention can eliminate these drawbacks. In particular, compared to the method of passing the core material through a reinforced 1H4-woven tube, in this invention the angle of the fibers is more uniform, and the wrapping of the reinforcement 11aN around the core material also creates a gap between the two. Can be wrapped tightly without
Reinforcement III no longer gets caught in the mold. In the conventional method, the fiber angles were disturbed, a gap was created between the reinforcement I1M and the core material, and the reinforcing fibers were caught in the mold. Furthermore, the racket frame manufactured according to the present invention has a strength of 150 when bent at three points.
However, the conventional method of passing a core material through a tube-shaped object could only withstand up to 100 kg. Furthermore, the produced racket frame has a good appearance and is easy to post-process after being heated and pressurized with a mold.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing a preferred embodiment of the present invention, and FIG. 2 is a sectional view of a manufactured frame. 1...Reinforcement fiber, 3...Core material. Applicant Brideston Co., Ltd. Agent Patent Attorney Masu 1) Takeo Dai (Figure? Figure 2)

Claims (1)

[Claims] 1. A method for manufacturing a racket frame in which reinforcing fibers are wrapped around the outer periphery of a core material, the method comprising wrapping a large number of continuous reinforcing fibers around the core material while transporting the core material in one direction. A method for manufacturing a racket frame, which comprises the following steps: a core material wrapped with reinforcing fibers is set in a mold along the shape of the racket frame, and heated and pressurized. 2. The method for manufacturing a racket frame according to claim 1, wherein one or more of carbon fiber, aramid fiber, and glass fiber is used as the reinforcing fiber. 3. The method for manufacturing a racket frame according to claim 1 or 2, characterized in that a foamed synthetic resin is used as the core material. 4. The method for manufacturing a racket frame according to any one of claims 1 to 3, characterized in that the reinforcing fibers are impregnated with a synthetic resin.