JPS6228231A - Manufacture of angling rod - Google Patents

Abstract

PURPOSE:To manufacture an angling rod with neither bending nor decrease in strength by a method wherein tape is wound to the outer peripheral surface of a prepreg in the manufacture of a hollow angling rod with non-circular cross-section by placing the prepreg wound onto a mandrel in an outer mold. CONSTITUTION:An angling rod is obtained by pressure-molding and then curing by heating prepreg 2 which is wound on a mandrel 1 and on the outer peripheral surface of which tape 3 made of polyethylene or the like is wound, in a non- circular outer mold 4 such as elliptical, hexagonal mold or the like. Because of being wound with the tape, the prepreg does not directly contact with the outer mold and consequently neither wrinkle nor opening or mesh of fibers develop and further no decrease in strength occurs. Furthermore, because no internal strain develops after curing by heating, an angling rod without bend is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a method for manufacturing a hollow fishing rod with a non-circular cross section such as an elliptical or polygonal cross section. The purpose is to efficiently manufacture fishing rods.

Conventional technology Hexagonal fishing rods and fishing rods with an oval cross section are known to have good directional stability during bending, but in order to manufacture such fishing rods with current fiber-reinforced resins, it is necessary to wrap them around a core metal. The prepreg is placed in an outer mold with a non-circular cross section and the prepreg layer is forcibly deformed into the shape of the cavity of the outer mold and pressure molded, so the fibers of the prepreg move due to friction with the outer mold during molding. Wrinkling or opening of the fibers may occur, creating unevenness on the surface of the tube after curing, reducing the strength of the tube, and the thermal expansion coefficients of the outer mold and prepreg differing during the thermosetting process. Therefore, shrinkage of the outer mold during cooling causes internal distortion in the prepreg, causing defects that cause bending.

Structure of the Invention The present invention improves these defects and manufactures a tubular fishing rod with a non-circular cross section.A tape is wound around the outer circumferential surface of a prepreg wound around a core metal, and then this is shaped into an elliptical cross section. The gist of this method is to put it into a non-circular outer mold such as a polygon, pressurize it, mold it into a non-circular cross section, heat harden it, and remove the tape and core metal.

The details of the present invention will be explained with reference to the drawings of the embodiments. After a prepreg 2 is wound around a core metal 1 in the usual manner, a tape 3 made of polyethylene, polypropylene, sellotape, etc. is wound spirally around the outer peripheral surface of the prepreg 2. Next, this is put into an outer mold 4 having an oval cross section and pressure molded to form the outer cross section into an oval shape, and then heat cured by applying pressure and heat to remove the heat impregnated into the prepreg 2. The curable synthetic resin is fluidized and hardened within the prepreg 2, and the prepreg 2 is hardened and molded into an elliptical cross-section as shown in FIG.

Next, this is taken out from the outer mold 4, the core metal 1 is extracted, and the tape 3 is peeled off to produce a hollow fishing rod having an oval cross section.

The tape 3 is wound to such an extent that the prepreg 2 is not wrinkled during pressure molding by the outer molds 4, 4, or openings are formed between the fibers of the woven fabric or aligned fiber sheet constituting the prepreg 2. Prepreg 2 is a woven fabric or aligned fiber sheet made of high-strength reinforcing fibers such as glass fiber or carbon fiber, similar to those used in conventional fishing rods, and thermosetting resin such as epoxy resin or polyester resin is coated in half. It is impregnated in a dry state.

The embodiment shown in FIGS. 4 to 6 is a case in which a hollow hexagonal fishing rod is manufactured by pressure-molding a prepreg 2 with a tape 3 wound thereon using outer molds 4 having a hexagonal cross section.

Effects of the Invention The present invention involves wrapping a tape around the outer circumferential surface of the prepreg when the prepreg wrapped around a core metal is placed in a non-circular outer mold with an elliptical cross section or the like and pressurized to forcibly transform the prepreg. Since the prepreg does not come into direct contact with the outer mold, wrinkles do not occur in the prepreg layer, causing unevenness on the surface of the fishing rod, and the fibers of the prepreg do not become open, reducing the strength of the fishing rod. At the same time, the tape prevents the occurrence of internal distortion due to expansion and contraction due to the difference in thermal expansion coefficient between the prepreg and the outer mold during heat curing, and has an excellent feature that allows easy and efficient manufacture of non-circular hollow fishing rods without bending. has.

[Brief explanation of the drawing]

1 to 3 are sectional views showing the manufacturing process of the present invention, and FIGS. 4 to 6 are sectional views showing the manufacturing process of another embodiment of the invention. 1... Core metal, 2... Prepreg, 3... Tape,
4.4... Outer mold. Patent Applicant Daiwa Seiko Co., Ltd. Figure 4 Figure 5 Figure 11 B1- Procedure Neho JE Document (Method) % Formula % 2. Name of the invention Method of manufacturing a fishing rod 3. Relationship with the person making the amendment Patent application Address: 3-14 Ajizawa, Higashikurume City, Tokyo] 6-4
, Agent Address: 80 Kamiya Building, 5-6-2 Shinjuku, Shinjuku-ku, Tokyo
36. Subject of correction

Claims (1)

[Claims] Wrap tape around the outer surface of the prepreg wrapped around the core metal,
A method for manufacturing a fishing rod, which comprises: placing the rod in a non-circular outer mold such as a polygon with an elliptical cross-section, applying pressure to shape the rod into a non-circular cross-section, and then heating and hardening the rod to remove the tape and core metal.