JPH05175U - FRP Butt - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a bat made of FRP, which is excellent in strength and durability as a bat. In a FRP bat which is formed by winding and laminating so that the fiber direction of the FRP reinforcing fiber has an arbitrary angle with respect to the longitudinal direction of the bat, at least the fiber direction of the reinforcing fiber in the hitting portion is set to the longitudinal direction of the bat. A bat made of FRP, wherein two or more layers wound so as to be 0 ° are dispersed and provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to baseball and softball bats. Regarding improvement of bats made of fiber reinforced synthetic resin (FRP) such as fiber and glass fiber Of.

[0002]

[Prior art]

  FRP bat, especially for forming bat by sheet winding method For the reverse taper, the outer shape of the part that transitions from the hitting part to the grip part is greatly different. -Because it has a shape, it is required as a bat such as rigidity, compressive strength and bending strength. Various methods have been devised for winding the sheet in order to satisfy the characteristics.   For example, as disclosed in Japanese Patent Publication No. 59-10229, hard foam plus Reinforcement of synthetic resin-impregnated glass, carbon, Kevlar, etc. on the outer circumference of the tic core Wound and laminated prepregs made of fibers with various angles to the central axis of the core You can see what you did.

[0003]   Regarding the winding angle of the reinforcing fiber with respect to the longitudinal direction of the bat, It is designed mainly for 0 ° layer to maintain the rigidity of Since it is difficult to follow the shape of the bat when applying it, wrinkles and sagging are easy to occur, so Angles and densities of reinforcing fibers become uneven, and there are large variations in bending, bending strength, etc. It also became a cause of cracks.

[0004]   In order to improve this drawback, as disclosed in JP-A-1-110377. In addition, 0 degree layer of prepreg is formed into a strip shape and laminated along the bat shape. Can be seen.

[0005]

[Problems to be solved by the device]

  The structure of the bat is such that rigidity, compressive strength, etc. Designing characteristics. Therefore, various winding angles of the reinforcing fiber are designed. In order to maintain the strength and rigidity of the bat, the weight of the 0 ° layer reinforcing fiber should be It requires 10-20% of the weight of the body's reinforcing fibers.

[0006]   The molding stress generated during bat molding is due to the fibers in the longitudinal direction of the bat, that is, 0 ° direction. Indicates tensile stress, and compressive stress occurs in fibers in other directions. Fiber in the 0 ° direction The larger the angle difference between the fiber and the fiber in the other direction, the larger the stress difference.   Therefore, since the conventional bat has a structure in which the 0 ° layer is concentrated at one location, The force increases and cracks occur between the 0 ° layer and the adjacent fiber layers at different angles. Or, if the 0 ° layer is thick, cracks occur in the 0 ° layer.

[0007]

[Means for Solving the Problems]

  In view of these conventional drawbacks, the present invention is an F that has excellent strength and durability as a bat. It is intended to provide an RP bat.

[0008]   The gist of the present invention is to set the direction of the reinforcing fiber of the FRP at an arbitrary angle with respect to the longitudinal direction of the bat. How to relieve the stress between layers in a bat that is formed by winding and laminating As a method, at least in the hitting portion, the winding angle of the reinforcing fiber is the longitudinal direction of the bat. The FRP bag is characterized in that two 0 or more layers are provided to disperse the layers. It is

[0009]   The thickness of the 0 ° layer above is different from other angles because the tensile stress applied during molding becomes large. There is a difference between the stress applied in the fiber direction and cracks along the fiber in the 0 ° layer. It is preferably 0.5 mm or less in order to prevent the occurrence.

[0010]   Further, a non-woven fabric layer having a thickness of about 0.1 to 0.2 mm is provided adjacent to the 0 ° layer. As a result, the stress between the layers can be more effectively relieved.

[0011]   The FRP used in the present invention is made of glass fiber, carbon fiber, polyamide fiber, etc. Machine fibers are used as reinforcing fibers, and the fibers are aligned in one direction and made into prepreg. There is.

[0012]

[Action]

  In forming the outer shell layer of the bat, the present invention aims at 0 in the longitudinal direction of the bat. The structure in which two or more layers of ゜ are dispersed is provided, so that the tensile stress is one layer. You no longer need to concentrate on.   Also, by adjusting the thickness of one layer of the dispersed 0 ° layer to 0.5 mm or less, Since the stress difference with other layers does not become large, the occurrence of cracks in the 0 ° layer and 0 It is possible to prevent the occurrence of cracks between the layer and the adjacent layer. Furthermore, in the 0 ° layer By providing non-woven fabric layers so that they are adjacent to each other, each non-woven fabric layer has no fiber orientation It has the effect of relieving the stress between.

[0013]

【Example】

  An embodiment of the present invention will be described below with reference to the drawings.   FIG. 1 is an external view of the bat of the present invention, FIG. 2 is a sectional view taken along the line AA of the bat of the present invention, and FIG. FIG. 4 shows another embodiment of the bat of the present invention. It is an AA section sectional view in   The bat 1 shown in FIG. 2 has a carbon fiber plug for forming the outer shell strength layer 2. Interlace the prepreg 4 with the longitudinal direction of the bat so that the winding angle is 60 ° and 0 °. They were wound and laminated on each other. Then, the layer 3 having the winding angle of 0 ° is divided into three layers 3a, 3b and 3c. , And are dispersed.   The bat 1 shown in FIG. 4 has a carbon fiber plug for forming the outer shell strength layer 2. Interlace the prepreg 4 with the longitudinal direction of the bat so that the winding angle is 60 ° and 0 °. They were wound and laminated on each other. Then, the layer 3 having a winding angle of 0 ° is dispersed into two layers 3a and 3b. The non-woven fabric layer 5 is wound around the portion adjacent to the 0 ° layer.

[0014]   The thickness of each of the dispersed 0 ° layers is preferably 0.5 mm or less. The nonwoven fabric layer 5 preferably has a thickness of about 0.1 to 0.2 mm.   The results of comparison of the physical properties of the obtained bat with those of the conventional product are shown in Table 1.

[0015]

[Table 1] Comparative product: A bat formed of glass / carbon fiber prepreg with a winding angle of ± 60 ° and 0 °. There is one 0 ° layer. Inventive product 1 ... A bat formed of glass and carbon fiber prepreg so that the winding angles are ± 60 ° and 0 °. The 0 ° layer was dispersed in three places. Each layer has a thickness of 0.5 mm. The bat of the present invention product 2 ... The bat of the present invention product 1 formed by providing a ± 30 ° layer between the ± 60 ° and 0 ° layers. In each case, the hitting portion was cut into 50 mm to obtain a test piece. In addition, the same effect can be obtained by providing a non-woven fabric layer adjacent to the 0 ° layer.

[0016]

[Effect of device]

  INDUSTRIAL APPLICABILITY Since the present invention is a bat having the above configuration, it has the following effects. It is a thing.   In the conventional bat, the stress at the time of forming has a winding angle of 0 °. For layers with applied force and other wrap angles, stress is applied in the radial direction. The difference in stress between the 0 ° layer and other winding angle layers was a problem, but the present invention uses the 0 ° layer. Is dispersed, and the thickness of each layer dispersed is 0.5 mm or less. As a result, the molding stress is not concentrated on one layer, and therefore the 0 ° layer and Since the stress difference with the layer at other angles can be reduced, the occurrence of cracks can be prevented.

[0017]   When the angle difference between the 0 ° layer and the layer having other fiber angles is large, the nonwoven fabric layer is Providing it adjacent to the 0 ° layer has the effect of further relaxing the stress difference.

[0018]

[Brief description of drawings]

FIG. 1 is an external view of a bat of the present invention.

FIG. 2 is a sectional view taken along the line AA of the bat of the present invention.

FIG. 3 is a perspective view of a main part showing the configuration of the bat of the present invention.

FIG. 4 is a sectional view taken along the line AA in another embodiment of the present invention.

[Explanation of symbols]

1 bat 2 Outer shell strength layer 30 ° layer 3a 0 ° layer 3b 0 ° layer 3c 0 ° layer 4 prepreg 5 Non-woven fabric layer

Claims (3)

[Scope of utility model registration request] 1. In a FRP bat formed by winding and laminating so that the fiber direction of the FRP reinforcing fibers is at an arbitrary angle with respect to the longitudinal direction of the bat, at least the fiber direction of the reinforcing fibers in the hitting portion is the longitudinal direction of the bat. An FRP bat characterized in that two or more layers are wound so that the layers are wound at 0 ° to the direction. 2. The FRP bat according to claim 1, wherein the 0 ° layer has a thickness of 0.5 mm or less. 3. An FRP layer made of non-woven fabric of reinforcing fibers is provided in a layer adjacent to the 0 ° layer.
Or the FRP bat described in 2.