JPH04355120A - Manufacture of tubular body - Google Patents

Abstract

PURPOSE:To constitute a manufacture of a tubular body which can eliminate a grinding process after firing. CONSTITUTION:A thermoplastic resin film 4, which is separated from a thermal shrinkage tape 3 and unified with prepreg 1, is formed into the thermal shrinkage tape 3 under a temperature at the time of firing, the thermal shrinkage tape 3 is wound round the outside of the prepreg 1, which is under a condition wound round a core metal 2, and fired.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention involves winding prepreg, which is a high-strength fiber impregnated with a thermosetting resin, around a core metal.
Regarding the manufacturing method of the tubular body in which the prepreg is hardened by applying pressure by the tightening force of the heat shrinkable tape by wrapping a heat shrink tape around the outer surface of the prepreg and firing it, please refer to the following for details. It is about transformation.

0002

[Prior Art] Taking as an example a fishing rod whose tubular body is called a carbon rod, in this type of fishing rod, prepreg formed into a sheet by impregnating carbon fiber with epoxy resin is wound around a core metal (mandrel). The prepreg is hardened by turning the prepreg, wrapping a heat shrink tape around its outer surface, and baking it. After baking, the core is removed, the heat shrink tape is removed, and the surface is polished. ,
Furthermore, rod materials are manufactured using surface treatments such as painting. In this method, a release agent such as silicone oil is applied to the inner surface of the tape in order to facilitate removal of the heat-shrinkable tape after firing.

0003

[Problems to be Solved by the Invention] Considering the conventional method described above, this method has the advantage that the heat shrink tape can be easily peeled off by applying a release agent. However, in order to remove this mold release agent, the surface is currently subjected to treatments such as polishing as described above. Note that this mold release agent originally has low adhesion to the tubular body after firing and to the heat shrink tape, so if this mold release agent remains on the surface, it will not work even after painting. , the paint film may easily peel off, or problems such as blisters (a type of bubbles) may occur. In addition, such polishing work has the disadvantage that the thickness of the tubular body decreases, resulting in a decrease in strength.
This is a relatively time-consuming process that would be desirable to omit, but from the perspective of forming a strong coating film, it cannot be omitted with current technology, and improvements are desired. An object of the present invention is to rationally configure a method for manufacturing a tubular body that can omit a polishing step after firing.

0004

[Means for Solving the Problems] As described at the beginning, the present invention is characterized by a method for manufacturing a tubular body, which comprises further winding a heat shrink tape around the outer surface of a prepreg wound around a core metal and firing the prepreg, which comprises: A thermoplastic resin film that separates from the heat-shrinkable tape and becomes integrated with the prepreg at the firing temperature is formed on the heat-shrinkable tape, and the outer surface of the prepreg is wound with the heat-shrinkable tape around a core metal. The functions and effects are as follows.

[0005]

[Operation] When the above characteristics are configured as shown in FIGS. 1 to 4, for example, the prepreg 1 is hardened in a state where a tightening force is applied to the prepreg 1 by the contraction force of the heat shrinkable tape 3 during firing, and this During firing, the resin film 4 formed on the heat-shrinkable tape 3 is softened and deformed into a shape that follows the outer surface of the prepreg 1, and is integrated with the prepreg 1 and separated from the heat-shrinkable tape 3. The shrink tape 4 can be easily removed, and since the resin film 4 separated from the heat shrink tape 4 is formed on the outer surface of the tubular body with a relatively smooth outer shape, this can be done without the conventional polishing work. It also becomes possible to directly paint the outer surface of the resin film 4. In other words, conventional heat shrink tape 3
On the other hand, compared to using a mold release agent with good separability for the tape 3 and the tubular body, the present invention uses a resin film that is easily attached to the tubular body and easily separated from the tape 3. 4, the time and effort required to remove the heat shrink tape 3 is not increased, and the thickness of the tubular body is not reduced by polishing.

[0006]

[Effects of the Invention] Therefore, by forming a resin film on a heat-shrinkable tape, which is a relatively simple improvement, it is possible to omit the polishing step after firing, and to create a tubular body without reducing the strength of the completed tubular body. A manufacturing method has been established.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. 1 to 4 show the manufacturing process of a fishing rod as an example of a tubular body, and in this process, the steps shown in FIGS.
As shown in , first, a sheet-like prepreg 1 made of aligned carbon fibers impregnated with epoxy resin is aligned with the fiber direction in the circumferential direction, axial direction, and circumferential direction of the mandrel 2 (an example of a core metal). At the same time, a heat shrink tape 3 is wound around the outer surface of this prepreg.

This heat-shrinkable tape 3 has a polyester base with polyurethane, polyvinyl alcohol, etc. on the inner surface, which makes it easy to separate from the tape base after baking the prepreg.
A resin film 4 is formed which is thermoplastic and has a property of being integrated with the epoxy resin during firing. Next, roll this roll into 1
By firing at a temperature of about 20 degrees to 180 degrees, the prepreg 1 is cured in a state where a tightening force is applied to the prepreg 1 by the shrinkage force of the heat-shrinkable tape 3, and
During this firing, the resin film 4 formed on the heat-shrinkable tape 3 is softened and becomes integrated with the prepreg 1 in a state in which it is deformed into a shape along the outer surface of the prepreg 1, and reaches a state where it is easy to separate from the heat-shrinkable tape 3.

Next, the mandrel 2 is pulled out and the tape 3
By removing , a fishing rod material R is obtained as shown in FIG. 3 (the material in which the three layers of prepreg 1 are integrated by firing is referred to as the fishing rod material R). The outer surface of the material R of the fishing rod is coated with the resin 4 transferred from the heat shrink tape 3, and then, as shown in FIG. 4, the outer surface of the resin 4 is directly coated to form a coating film. The fishing rod is completed by forming the wafer and performing predetermined printing.

[Other Embodiments] In addition to the above embodiments, the present invention includes
The heat-shrinkable tape may be of any material as long as it shrinks when heated, and the resin film formed on the tape may be easily separated from the tape during firing and blend easily with the prepreg. Any material may be used.

[0011] Note that although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure of the accompanying drawings by such entry.

[Brief explanation of drawings]

[Figure 1] Perspective view showing the winding state of heat shrink tape

[Figure 2]
Cross-sectional view of heat shrink tape wrapped

[Figure 3] Cross-sectional view of the completed tubular body

[Figure 4] Cross-sectional view of the tubular body after painting

[Explanation of symbols]

1 Prepreg 2 Core metal 3 Heat shrink tape 4 Resin film

Claims (1)

[Claims] Claim 1: A prepreg (1) made of high-strength fiber impregnated with a thermosetting resin is wound around a core metal (2), and a heat shrink tape (3) is wound around the outer surface of this prepreg (1). A method for producing a tubular body in which a prepreg (1) is cured under pressure applied by a tightening force of a heat-shrinkable tape (3) by firing the prepreg at a temperature during the firing. A thermoplastic resin film (4) that is separated from the tape (3) and integrated with the prepreg (1) is formed on a heat-shrinkable tape (3), and this heat-shrinkable tape (3)
A method for manufacturing a tubular body, in which the prepreg (1) is wound around a core metal (2), and the prepreg (1) is wound around the outer surface of the prepreg (1), and then fired.