JPS60212334A - Manufacture of tubular body such as fishing rod - Google Patents

Abstract

PURPOSE:To obtain the titled tubular body which can prevent distortion due to the difference in the adhesivity and the coefficient of thermal expansion accomplishing an integral joint by a method wherein a high-strength short fiber is impregnated with a thermosetting synthetic resin, wrapped on a core metal once and then, the end faces thereof butted together to join. CONSTITUTION:A thin woven cloth 2 is laminated on one side of a short fiber sheet 1 in which high-strength short fibers (e.g. carbon fiber 3-6mm. long and 7mum in the diameter) are arranged in one way to overlap each other as required and impregnated with a thermosetting synthetic resin (e.g. epoxy resin) to form a prepreg sheet 3. The sheet 3 thus obtained is wrapped on a core metal once and end faces thereof are butted together to join without overlapping. Then, it is taped and hardened by heat to obtain the desired tubular body.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing tubular bodies such as fishing rods.

Conventionally, tubular bodies such as fishing rods are made by winding a prepreg sheet (3) around a core metal (4) multiple times and partially polymerizing it, as shown in Figure 3. Part (a)
This is a defect that causes variations in strength, bending, twisting, etc. in each direction of the tubular body, making it impossible to manufacture a homogeneous tubular body.

In order to eliminate this individual piece 411, an attempt is made to wrap it around a prepreg core metal and butt-join the ends, but in the case of long fibers, the fibers at the joint part are not entangled ( The bonding strength of this part decreases.

At present, the bending strength, crushing strength, etc. are insufficient and it cannot be put to practical use.

The present invention improves these defects by manufacturing prepreg using a sheet formed by arranging high-strength short fibers in one direction so as to overlap each other. A prepreg sheet is formed by impregnating a short fiber sheet formed by arranging the fibers in one direction so as to overlap each other with a thermosetting synthetic resin. Join by butting without overlapping, then taping using the usual method.

The gist is to manufacture a tubular body without heat curing treatment.

According to the present invention, the short fibers at the abutted portions of the prepreg sheet wound around the core metal move slightly in the local direction due to the winding action and are intertwined with each other so as to overlap, and the impregnated fibers are synthesized in the heat curing process. This intertwining is further promoted by the flowing action of the resin, and it is possible to manufacture a tubular body such as a fishing rod that is integrally joined and has uniform strength, flexure, twist, etc.

In addition, in the tubular body according to the present invention, the short fibers are arranged densely and evenly in the circumferential direction, and it is possible to prevent vertical cracks between the fiber bundles as in the case of using conventional long fibers, so that the bending strength is 1. , crushing strong thighs can also be improved.

Furthermore, the prepreg sheet of the present invention can easily adjust the thickness, mix different types of fibers, and adjust the mixing ratio, so it is easy to manufacture tubular bodies with the required functions, and it is easier to manufacture tubular bodies with the required functions. Prepreg sheets of different types of fibers 9 It is possible to prevent differences in interlayer adhesion due to polymerization and distortion due to thermal expansion coefficients, and to fully exhibit the characteristics of different types of fibers.

To explain the present invention in detail, charcoal 1. Forming a short fiber sheet (1) in which high-strength short fibers of the same or different types, such as carbon fiber, glass, silicon carbide, silicon nitride, alumina, alumide, etc., are closely aligned in one direction so as to overlap each other, If necessary, a thin woven fabric (2) can be further polymerized on one side of this.

The length of the high-strength short fibers is preferably 0.5 to 5011111, preferably 3 to 6. to form a short fiber sheet of appropriate thickness.

Further, as the thin fiber sheet (2) to be attached as required, a thin woven fabric made of long fibers such as glass fibers and carbon fibers is used.

Next, short fibers (11) are impregnated with a thermosetting synthetic resin such as epoxy resin or polyester resin, semi-dried to form a prepreg sheet (3), and the prepreg sheet (3) is cut into core metal ( 4) - Roll it up and join both ends, then tape the upper part, heat harden it sequentially by the usual method, remove the core metal and remove the taping,
The tubular body is manufactured by polishing, etc.

Example 1 1901 i'/m'' of short carbon fibers with diameter 72 and length 5 gm 540 y/m of short glass fibers with diameter 10 μm and length 5 m
A short fiber sheet is formed by mixing the short fibers at a volume ratio of 80:20 and arranging them in one direction so that they overlap each other, and then adding epoxy resin to the short fiber sheet at a volume ratio of 60:4.
Impregnate it so that it becomes 0 and the thickness=”! 0.6111f
I manufacture prepregs.

Next, 20.7 m11. Cut into a trapezoid shape with a rear end width of 27.7 mm and a length of 1.100 tl.
This has a tip diameter of 6.011! ! 1. Rear end diameter 8. ';l
1. After wrapping the metal core part with a length of 1.100 mm and joining the joint end surfaces against each other, taping the top surface and 1
Next, a fishing rod is manufactured by sequentially performing heat curing treatment, removing the core 4L2, and removing the taping by a conventional method.

Example 2゜diameter 7P length 3gmI) Carpore short @M560f/mR and 140P/mR of short glass fiber with diameter 10×4 length 4.5g
mQ was mixed at a volume ratio of 85:15, and the mixture was pasted onto a short fiber sheet that was arranged in one direction so as to overlap each other, and then a glass fiber screen/shim sheet with a thickness of 0.02 strips was pasted. Thereafter, it is impregnated with epoxy resin at a volume ratio of short fibers to resin of 60:40 to produce a prepreg sheet with a thickness of 0.6 cm.

This prepreg sheet is used in Example 1 below. Manufacture fishing rods in the same manner.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the prepreg sheet of the present invention wrapped around a core metal, and FIG. 2 is a perspective view showing the same manufacturing process. FIG. 3 is a cross-sectional view of a prepreg sheet wrapped around a metal core by a conventional method. (1)... Prepreg Sea), +21... Core metal. Patent applicant Daiwa Seiko Co., Ltd.

Claims (1)

[Claims] High-strength short fibers are formed by arranging 51C short fibers in one direction so as to overlap each other. Impregnated with thermosetting synthetic resin to form prepreg sheet 1, and rolled around the core bar of the prepreg sheet. A method for manufacturing a tubular body such as a fishing rod, in which the ends are butted and joined without overlapping, and the tubular body is manufactured by taping and thermosetting using conventional methods.