JPH0824730B2 - Fiber-reinforced plastic bat and method for producing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bat made of fiber reinforced plastics for baseball / softball.

(Prior Art) In recent years, as the bat, FRP (thermosetting reinforced fiber plastics) has become the mainstream in place of conventionally used wood. As reinforcing fibers, long fibers, short fibers,
Whiskers are used. As a matrix resin, a thermosetting resin such as an epoxy resin is mainly used, and a thermoplastic resin such as 6-nylon, polycarbonate, or PBT resin is partially used.

(Problems to be Solved by the Invention) However, when a thermosetting resin such as an epoxy resin is used as the matrix resin, when the ball is hit, the strength required to withstand the impact with the ball and necessary to return the ball In order to maintain the strength, the rigidity of the bat in the entire length direction becomes high, and the vibration at the time of impact tends to crack the user's hand.
In addition, it is vulnerable to abrasion due to contact with the ground such as the ground, the resin is easily chipped, and if the outer surface is scratched, stress concentrates on that part, cracks occur, and eventually it breaks. Had.

Further, when a thermoplastic resin is used, short fibers are mainly used as the reinforcing fibers, and the rigidity is low and the cross-sectional area of the reinforced plastics portion becomes large and the bat weight becomes large in order to maintain the strength. There was a tendency.

In addition, when using a hollow core material using a tube made of thermoplastic resin and leaving the tube in the molded body, the adhesion between the tube made of thermoplastic resin and the thermosetting resin is not good There was a problem.

In view of these conventional drawbacks, the present invention has an object to supply a bat made of fiber reinforced plastics which is excellent in vibration damping property and fatigue strength of the bat.

(Means for Solving the Problems) A constitution of the present invention is a fiber-reinforced plastic bat comprising long-fiber-reinforced thermosetting plastics and long-fiber-reinforced thermoplastics, which is an outermost layer or an innermost layer. Is a fiber-reinforced plastics bat made of long-fiber-reinforced thermoplastics, and a step of coating a core material with a prepreg impregnated with a thermosetting resin, and a long-fiber-reinforced thermoplastics bat A method for producing a fiber-reinforced plastic bat characterized in that it has a step of covering with a sheet or a cylinder, and after setting in a molding die, the die is heated, further cooled, and demolded. Hereinafter, description will be given based on an example of a fiber-reinforced plastic bat.

(Example) In molding a bat 1 as shown in Fig. 1, Example 1: a foam synthetic resin core material 4 was coated with long fiber reinforced thermosetting plastics 5, and the outermost layer was reinforced with long fiber. Molded with thermoplastics 6. (FIG. 2) Example 2: A foam synthetic resin core material 4 is coated with long fiber reinforced thermoplastics 6, and the outer periphery of the foam synthetic resin core material 4 is coated with long fiber reinforced thermosetting plastics 5 for molding. (FIG. 3) Example 3: A thermoplastic resin tube 7 is used as a core material, the thermoplastic resin tube 7 is coated with a long fiber reinforced thermoplastic 6, and the outer periphery thereof is further provided with a long fiber reinforced thermosetting plastic. After coating with a cloth 5, it is set in a mold, liquid or gas is sent to the thermoplastic resin tube 7 to apply pressure, and the molding material is heat-molded. (FIG. 4) As the matrix resin of the long fiber reinforced thermosetting plastics 5 used in the present invention, various thermosetting resins such as epoxy, polyester and polyimide can be used. Further, as the matrix resin of the long fiber reinforced thermoplastics 6, thermoplastic resins such as urethane, ABS, nylon, polycarbonate, PET, PBT, PPO, POM and copolymers thereof can be used.
Of these, it is preferable to use low melting point copolymer nylon.
Furthermore, as the reinforcing long fibers, carbon fibers, glass fibers,
Organic fibers such as aramid and other ceramic fibers can be used.

(Operation) The present invention is a bat made of fiber reinforced plastics consisting of long fiber reinforced thermosetting plastics and long fiber reinforced thermoplastics, wherein the outermost layer or the innermost layer is long fiber reinforced thermoplastics. A fiber-reinforced plastic bat characterized by being present, and a step of coating the core material with a prepreg impregnated with a thermosetting resin, and a step of coating with a long-fiber-reinforced thermoplastic sheet or cylinder. A method for producing a fiber-reinforced plastic bat characterized in that it has, after being set in a molding die, the die is heated, further cooled, and demolded, long fiber reinforced used in the present invention Since thermoplastics consist of fiber material and matrix resin, the vibration damping properties and toughness of the fiber material should improve and maintain various characteristics of the bat. Since the matrix resin is highly flexible,
It has the effect of minimizing the effect on rigidity. Furthermore, long-fiber-reinforced thermoplastics have the effect that when the long-fiber-reinforced thermosetting plastics harden, the matrix resin melts or softens, resulting in increased adhesion to the matrix resin of the long-fiber-reinforced thermosetting plastics. Play.

Other Examples Although not shown, the moldability is greatly improved by using the sleeve as the reinforced long fiber of the long fiber reinforced thermoplastic. Further, in terms of adhesion at the interface between the long fiber reinforced thermosetting plastics and the long fiber reinforced thermoplastics, the softening point or melting point of the matrix resin of the thermoplastic long fiber plastics depends on the long fiber reinforced thermosetting plastics. It is preferable to lower the deterioration temperature of the matrix resin of the plastics by 0 to 50 ° C., and it is more preferable to reduce the resin content of the long fiber reinforced thermoplastics to about 5% to about 20% so as to reduce voids. It is possible to suppress the generation and to improve the moldability of the surface very much.

(Effect of the invention) As described above, the present invention is a bat made of fiber-reinforced plastics composed of long-fiber-reinforced thermosetting plastics and long-fiber-reinforced thermoplastics, in which the outermost layer or the outermost layer is long. Fiber-reinforced plastic bat characterized by being fiber-reinforced thermoplastics, and a step of coating a core material with a prepreg impregnated with a thermosetting resin, and a long-fiber-reinforced thermoplastic sheet or A method for manufacturing a fiber-reinforced plastic bat characterized in that it has a step of covering with a tubular body, and after setting in a molding die, the die is heated, further cooled, and demolded. It has the following effect.

The long fiber reinforced thermoplastic absorbs vibration quickly and enables stable hitting. Further, the long fiber reinforced thermoplastics are resistant to stress cracks and have higher durability.

In addition, since long-fiber reinforced thermoplastic sheet softens when heated, it can be molded well along the shape of the mold, and long-fiber reinforced heat can be integrated even in areas with irregularities or steps. Since plastic plastics can be used, the number of parts can be reduced, and the merit in manufacturing is also very large, there is no boundary between members of a molded product formed by an integral member, and there is no interface breakage at a joint or an adhesive part. Boundary destruction is significantly reduced, and it is highly durable. Also, it can be molded at the same time during bat molding, for example, the grip end can be molded at the same time as mold molding,
The work man-hour can be significantly reduced.

When used partially, the conventional FRP would increase the rigidity of that part, and there was a design constraint, but since long fiber reinforced thermoplastics has little effect on rigidity, it can be placed at any position. It can be arranged in any shape.

In addition, when long-fiber reinforced thermoplastics are used in the part that contacts the ground such as the side peripheral part, even if it wears, the matrix resin is softened by frictional heat, so that cracks are less likely to occur and wear resistance is improved. .

In addition, when long fiber reinforced thermoplastics is placed in the outermost layer, a transparent resin is placed on the surface so that the long fiber reinforced thermoplastics can be seen visually from above, below or from the side. This has the effect of visually identifying the function of vibration damping. Furthermore, it is possible to make an interesting design because the arbitrary design can be made on the top and bottom of the surface material, and it is possible to arrange the design with emphasis.

In addition, in the case of internal pressure molding, the adhesion between the thermoplastic resin tube and the long fiber reinforced thermoplastics is improved, and there is no noise or peeling of the tube.

As described above, the present invention enables the long fiber reinforced thermoplastics to be arranged in the outermost layer or the innermost layer of the bat, and the long fiber reinforced thermoplastics are composed of a fiber material and a matrix resin. Therefore, due to the vibration damping property and the toughness of the fiber material, while the various characteristics of the bat are improved and maintained, the matrix resin is highly flexible, so that the influence on the rigidity can be minimized. Moreover, since it has excellent moldability, it can be placed in a mixture with other members, and its vibration damping characteristics can be changed as desired, making it possible to design bats with excellent vibration damping. Becomes Furthermore, since resin control is also possible, it is possible to change the elasticity and rigidity of the bat, and it is possible to make a bat with more variations.

[Brief description of drawings]

1 to 4 show an embodiment of a bat according to the present invention, FIG. 1 is a front view, and FIGS. 2 to 4 are enlarged sectional views taken along the line AA in FIG. 1 ... Bat, 2 ... Hitting area, 3 ... Grip area, 4 ...
… Core material, 5 …… Long fiber reinforced thermosetting plastics, 6
...... Long fiber reinforced thermoplastics, 7 ...... thermoplastic resin tube, 8 ...... hollow part.

Claims (5)

[Claims] 1. A bat made of fiber reinforced plastics comprising long fiber reinforced thermosetting plastics and long fiber reinforced thermoplastics, wherein the outermost layer or the innermost layer is long fiber reinforced thermoplastics. A bat made of fiber reinforced plastic characterized by the above. 2. A bat made of fiber reinforced plastics according to claim 1, wherein low melting point copolymerized nylon is used as a matrix resin of said long fiber reinforced thermoplastics. 3. The fiber reinforced plastic bat according to claim 1, wherein a sleeve is used as the reinforced long fibers of the long fiber reinforced thermoplastics. 4. The core material has a step of coating a prepreg impregnated with a thermosetting resin, and a step of coating a long fiber reinforced thermoplastics sheet or cylinder, which is set in a molding die. After that, the mold is heated, further cooled, and released from the mold, which is a method for producing a fiber-reinforced plastic bat. 5. The softening point or melting point of the matrix resin of the long fiber reinforced thermoplastics is 0 to 50 ° C. lower than the deterioration temperature of the matrix resin of the long fiber reinforced thermosetting plastics. 4. The method for producing the fiber-reinforced plastic bat according to 4.