JPS62280026A - Manufacture of hollow tubular body such as angling rod or the like - Google Patents

Abstract

PURPOSE:To prevent the strength of a hollow tubular body in which the tapering rate changes abruptly, such as an angling rod or the like, from lowering by a method wherein a prepreg is wound round a tapered mandrel, in which the tapering rate changed abruptly, and, after that, high strength fiber yarns are braided cross-wise throughout before and behind portions, across which the tapering rate changes in order to bring the prepreg into close contact with the mandrel. CONSTITUTION:After a prepreg 2 is wound round a tapered mandrel, in which the tapering rate changes in (a), (b) and (c) in the order named from the tip in such an abrupt manner that the difference between the tapering rates at the boundary portion, across which the tapering rate changes, is 15/1000 or more, high strength fiber yarns 3 are braided cross-wise throughout before the boundary portion, across which the tapering rate changes from (a) to (b) and behind the boundary portion, across which the tapering rate changes from (b) to (c) in order to bring the prepreg 2 over said portions into close contact with the mandrel 1. Next, a tightly binding tape 4 is helically bound from one end of the prepreg 2 by conventional procedure. Further, heat curing treatment, mandrel releasing treatment and tape peeling- off treatment are performed in the order named in order to manufacture a hollow cylinder. Consequently, the lowering in bending strength or a weak point on structure and at molding of the hollow cylinder such as an angling rod or the like can be prevented from generating.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention Purpose of the Invention The present invention relates to a method for manufacturing a hollow tubular body such as a fishing rod by winding prepreg around a metal core, and the present invention relates to a method for manufacturing a hollow tubular body such as a fishing rod. The purpose is to prevent the strength of hollow tubular bodies such as fishing rods from decreasing.

Conventional technology The taper of a fishing rod formed by winding conventional prepreg is such that the taper ratio of one core metal is O/1000 to 20/20.
Currently, the taper ratio is gradually changed within a range of 0.00, and even when the taper ratio is changed rapidly in some areas, the difference in the taper ratio is 10/1000 or less.

The reason for this is that if the taper ratio suddenly changes, the wrapped prepreg will not be tightly wound accurately along the boundary part of the core where the taper ratio has changed, and the bonding tape will be wound in a spiral after the prepreg is wound. At the boundary where the ratio changes, the prepreg is pulled with tape and wrinkled to one side, the reinforcing fibers are bent or twisted, and the impregnated resin becomes coarse and dense during heat curing, resulting in a significant decrease in strength. It is.

However, in recent years, a grip has been formed directly on the rod body in order to improve the detection of fish (fish hit). The difference is 20/1000 to 80/100
There are defects in which the strength decrease reaches 0 and the strength decrease becomes even more remarkable.

Structure of the Invention The present invention prevents a decrease in strength of a tubular body having a taper in which the difference in taper ratio changes greatly, and a prepreg is wrapped around a core bar having a taper in which the taper ratio changes rapidly. After that, high-strength fiber threads are braided in a cross pattern before and after the portion where the taper ratio changes, and the prepreg in this portion is brought into close contact with the core metal, and then taping, thermosetting treatment, decoring treatment, and tape are sequentially performed by conventional methods. The gist of this is to perform a peeling treatment.

To explain the present invention in detail, the difference between the taper ratios a, b, c sequentially from the tip and the taper ratio at the boundary is 1.5/10.
After wrapping the prepreg 2 around the core metal 1 having a taper that rapidly changes to 00 or more, the taper ratio C is calculated from the front of the boundary between the taper ratios a and b, which is the range shown by the arrow in FIG. 3. High-strength fiber threads 3 are braided in a cross-like manner at the rear of the boundary area, and the prepreg 2 in this area is brought into close contact with the core metal 1, and then a binding tape 4 is spirally bound from one end of the prepreg 2 in the usual manner. The tubular body is then manufactured by sequentially performing a heat curing treatment, a decore treatment, and a tape peeling treatment.

However, as the prepreg 2, an aligned fiber sheet i of reinforcing fibers such as glass fibers and carbon fibers that have been used conventionally is used.
~ or a woven fabric impregnated with a thermosetting synthetic resin, and the high-strength fiber yarn 3 is a high-strength fiber such as carbon fiber, glass fiber, aramid fiber, impregnated with or not impregnated with a thermosetting synthetic resin. Use bundles or twisted ones.

FIGS. 6 and 7 show the core bar 1 in another embodiment, and in FIG. 6, high-strength fiber threads are applied to the prepreg portion in the range indicated by the arrow in the core bar whose taper ratio is changed to a and b. It is braided in a criss-cross pattern, and the taper ratio shown in Figure 7 is;
High-strength fiber threads are braided in a criss-cross pattern in the prepreg portions shown by arrows in the core bars that have changed from i, b, and c.

Effects of the Invention The present invention wraps a prepreg around a core bar having different rapid taper ratios, and then braids high-strength fiber threads in a cross shape on the surface of the prepreg before and after the boundary parts with different taper ratios. After the prepreg is closely attached to the metal core, taping, thermosetting, de-coring, and tape peeling are performed using conventional methods, so the prepreg in areas where the taper ratio drastically differs may wrinkle or twist due to taping. This type of tapered rod, which adheres to the core in an evenly wound state without any twisting, is excellent in that it can prevent a decrease in bending strength, which is a weak point in the structure and molding of tubular bodies such as fishing rods that have sharply different tapers. It has the characteristics that
In particular, the grip handle can be molded integrally with the fishing rod, improving the fish detection performance.

[Brief explanation of the drawing]

1 to 4 are explanatory diagrams showing the manufacturing process of the present invention, FIG. 5 is a sectional view taken along line A-A in FIG. 2, FIG. 6 is a sectional view of FIG. 3, and FIG. The enlarged front view of the figure, and FIGS. 8 and 9 are front views of core bars of different embodiments, respectively. DESCRIPTION OF SYMBOLS 1...Core metal, 2...Prepreg, 3...High strength fiber yarn, 4...Tape, a, b, c...Taper ratio.

Claims (1)

[Claims] After wrapping the prepreg around a core metal having a taper where the taper ratio changes rapidly, high-strength fiber threads are braided in a crisscross pattern before and after the area where the taper ratio changes, and the prepreg in this area is tightly attached to the core metal. 1. A method for producing a hollow tubular body such as a fishing rod, which is characterized by sequentially applying taping, thermosetting, de-coring, and tape peeling according to conventional methods.