JPH0564671A - Frp-made bat and manufacture thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] By molding a batt with reinforcing fibers and a matrix fiber made of a thermoplastic resin, the reinforcing fibers are arranged in the fiber direction having the characteristics as a batt according to the design, and are manufactured. Save time. [Structure] An outer shell material is formed on a core material having a bat shape from reinforcing fibers and thermoplastic resin fibers, and the thermoplastic resin fibers of the outer shell material are wound and laminated while being heated and melted to form a matrix. After heating, cooling, decoreing and molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a baseball / softball bat, and more particularly to a fiber reinforced resin bat formed by a filament winding method or a tape winding method and a method for producing the same. Is.

[0002]

2. Description of the Related Art Conventionally, as a bat made of fiber reinforced resin (hereinafter abbreviated as FRP), a woven fabric made of continuous fibers such as carbon and glass, roving, blade and the like are impregnated with a thermosetting resin to form a prepreg. It is common to use a sheet winding method in which the material is wound and laminated on a substantially bat-shaped core material, placed in a mold, and heat-cured and molded. In addition, as disclosed in Japanese Patent Publication No. 59-10228 and the like, a bat made of a thermoplastic fiber reinforced plastic produced by injection molding and JP-A-1-148281.
As disclosed in Japanese Patent Laid-Open Publication No. 2000-242242, a bat by a filament winding method is known in which continuous fibers are wound around a bat-shaped mandrel at a desired angle and the varnish is cured and molded by a mold.

[0003]

In the sheet winding method using the prepreg made of the thermoplastic resin,
Yield is poor, such as continuous fibers in the form of a woven fabric or a blade, further forming the woven fabric or blade into a prepreg, cutting the prepreg and laminating for bat molding, and more steps until bat molding, There is a problem that it takes a relatively long time until the thermosetting molding.
Also, the bat has a tapered shape with a complicated outer shape,
When the sheet-shaped prepreg is wound, it is difficult to wind by wrinkling and continuously changing the orientation angle of the fiber, and it is difficult to sufficiently impart the characteristics as a bat.

The injection molding method using a thermoplastic resin using the above short fibers has a drawback that it is inferior in strength and rigidity as compared with a bat using continuous fibers because short fibers are used as a reinforcing material. It was In addition, in the filament winding method, if the continuous fibers are directly filament-wound onto the substantially vat-shaped core material, the fibers tend to slip and it is difficult to wind them at the desired angle. Further, it is necessary to impregnate the matrix resin for molding after winding the fibers, which makes it difficult to impregnate the wound fibers with each other, which may cause voids. Further, in the case of filament winding a fiber impregnated with a resin, the impregnated thermosetting resin has a high viscosity, and thus it is difficult to apply the tension evenly around the core material. Therefore, the present invention aims to provide a bat having excellent impact resistance, excellent vibration damping, and a short molding cycle, and a method for manufacturing the bat.

[0005]

SUMMARY OF THE INVENTION According to the present invention, an outer shell material is formed by reinforcing fibers made of continuous fibers and fibers made of a thermoplastic resin,
The thermoplastic resin fibers of the outer shell material are wound around the core material which has been heated to a constant temperature in advance so that the thermoplastic resin fibers are melted and wrapped around the core material so that the thermoplastic resin fibers are laminated and heated. It is intended to produce an FRP bat characterized by being post-cooled, decoreed and molded.

[0006]

In the bat of the present invention, an outer shell material is formed of reinforcing fibers made of continuous fibers and thermoplastic resin fibers, and the thermoplastic resin fibers of the outer shell material are preliminarily heated to a constant temperature so as to form a matrix. The FRP vat is manufactured by heating the outer shell material to the heated core material, melting the thermoplastic resin fiber, winding the reinforcing fiber while impregnating the resin, and laminating the resin, heating, cooling and decoreing. Therefore, since the reinforcing fiber is not provided with rigidity, it is easy to apply tension when winding it, and when it is wrapped around the mandrel, the molten thermoplastic resin fiber imparts an appropriate viscosity to the reinforcing fiber so that The arrangement angle does not shift easily, and since it is a method of winding the core material while heating it, heating, pressurization, and curing are performed continuously, and it has the effect of shortening the molding cycle and improving productivity. .

[0007]

EXAMPLES The present invention will be described based on examples. FIG. 1 is a front view of the FRP bat of the present invention, and FIG.
A line sectional view. FIG. 3 is a simplified explanatory view of the manufacturing method. As the continuous fibers of the outer shell material used in the present invention, carbon fibers, glass fibers, aramid fibers and fibers having the same effect as these can be used. As the thermoplastic resin of the thermoplastic resin fiber, polyetheretherketone, polyamideimide,
Polyamide, polyethylene terephthalate, polypropylene and thermoplastic resins having the same effect as these can be used. In molding, the above-mentioned thermoplastic resin is made into a thermoplastic resin fiber state and can be used in any shape such as continuous fiber shape or short fiber shape.

(Example 1) A mandrel having a substantially bat shape is used as a core material 3, and reinforcing fibers made of continuous carbon fibers and continuous fibers made of a thermoplastic polyamide resin are added to the core material 3 as a thermoplastic resin. An FRP bat is formed by bundling fibers and fibers to form an outer shell material for the commingle yarn 2 and winding and stacking the commingle yarn 2 using a filament winding molding device.
In winding the commingle yarn 2, the core material 3 is heated to a constant temperature, and is heated immediately before winding the commingle yarn 2 around the core material to melt the polyamide fibers so as to form a matrix. Wrap around. After stacking the commingle yarns into a bat shape, cooling and curing, and removing the core material, although not shown,
The tip of the bat and the grip end are bonded together to form a bat. The orientation angle when winding the commingle yarn is an angle according to the characteristics of the bat, such as a hitting portion requiring compression strength and rigidity, a taper portion requiring bending strength, and the like. By so doing, the polyamide resin is impregnated into the carbon fiber and the batt can be formed at the same time when the commingle yarn is wound and laminated.

(Example 2) Instead of the commingle yarn 2 of Example 1, carbon fibers are aligned in one direction, and short fibers of polyether ether ketone fibers are entangled to have a width of 0.5 to 2.0 cm. Core material 3 using the tape-shaped outer shell material
Wrap and stack. The lamination method was the same as in Example 1.

[0010]

EFFECTS OF THE INVENTION Since the present invention is a bat having the above-described structure and a method for manufacturing the same, it has the following effects. That is, the bat of the present invention, by using the thermoplastic resin as a matrix with the continuous fiber as the reinforcing fiber, makes the best use of the advantages of the thermoplastic resin having good vibration damping and impact resistance, and has the same strength and rigidity as the conventional one. The bat has the same characteristics as the epoxy resin bat. Next, according to the method of the present invention, an outer shell material is formed of reinforcing fibers made of continuous fibers and thermoplastic resin fibers, and the thermoplastic resin fibers of the outer shell material are used as a matrix in advance. On the core material heated to a constant temperature, the thermoplastic resin fibers are wound and laminated while being heated and melted, and after heating, cooling and decoreing are performed, so that the impregnation of the resin at the time of molding is smooth. Therefore, the content of the reinforcing fiber can be increased. In addition, the orientation angle of the reinforcing fiber when wound around the core material is difficult to shift, it can be arranged as designed, and heating, pressing and curing are performed continuously, shortening the molding cycle and improving productivity There is.

[Brief description of drawings]

FIG. 1 is a front view of an FRP bat.

FIG. 2 is an enlarged end view of the AA line portion.

FIG. 3 is a simplified explanatory diagram of a manufacturing method.

[Explanation of symbols]

 1 FRP bat 2 Comingle yarn 3 Core material 4 FRP outer shell B Outer shell material

Claims (4)

[Claims] 1. An outer shell formed by using continuous fibers as reinforcing fibers and a thermoplastic resin as a matrix to form an outer shell.
RP bat. 2. An outer shell material is formed of reinforcing fibers made of continuous fibers and thermoplastic resin fibers on a substantially bat-shaped core material, and the thermoplastic resin fibers of the outer shell material serve as a matrix. A method for producing an FRP bat, characterized in that the thermoplastic resin fiber is wound around the core material heated in advance at a predetermined temperature while being melted by heating and laminated, and after heating, cooling and decoreing is performed. 3. The outer shell material is formed by bundling reinforcing fibers made of continuous fibers and thermoplastic resin fibers into a commingle yarn, and molding the commingle yarn by a filament winding method. The method for manufacturing the FRP bat according to claim 2. 4. The outer shell material is obtained by aligning reinforcing fibers made of continuous fibers in one direction or by making it into a woven fabric, in which short fibers of thermoplastic resin fibers are entangled to form a tape, and using the tape, The method for manufacturing an FRP bat according to claim 2, wherein the FRP bat is manufactured by a tape winding method.