JPH05252852A - Tubular form made from thermoplastic resin and its production - Google Patents

Abstract

PURPOSE:To provide the subject tubular form having circular cross section, partly afforded with a non-circular cross section in a simple way. CONSTITUTION:A tubular form 4 having circular cross section is first made by wrapping a core metal with a sheet prepreg formed by mixing aramid resin fibers with reinforcing carbon fibers and by covering the prepreg with a forming tape followed by baking. Then, the core metal is removed from the tubular form 4, and the resulting tubular form 4 is heated and softened, and part of the tubular form 4 softened is then put to press forming using a mold into a portion A of a non-circular and virtually ellipsoidal cross section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin tubular body used as a material for a fishing rod and a method for producing the tubular body.

[0002]

2. Description of the Related Art Conventionally, in forming a tubular body of this type,
This was done using a prepreg of thermosetting resin.

[0003]

This is because the thermosetting resin is adopted because it is hard to be deformed after molding and has high stability, but it has a drawback in that it is difficult to deform after molding. That is, when molding a tubular body, a standard prepreg cut into a predetermined shape is wound around a core metal to form a tubular body, but since it is necessary to consider decoreing, it has a loose taper as a tubular body. Since it is limited to a conical tubular body, it is difficult to integrally form a non-circular cross section, and the only thing that can be done is to use another material for padding when winding the prepreg around the core metal. When the tubular body is inserted and the core is decoreed to remove the other material, only the projecting shape is provided, and there is a particular difficulty in the recessed shape. Therefore, we adopted a sheet-shaped prepreg consisting of a thermoplastic resin with excellent moldability and high-strength reinforcing fibers, wound this prepreg on a core metal of non-circular cross section, and then covering it with a molding tape to form a non-circular cross section. Although a method of forming the tubular body may be considered, in this case, there were the following problems. That is, it is necessary to heat the thermoplastic resin to a temperature equal to or higher than its melting temperature to defoam to reduce voids and bring the sheet-like prepreg into close contact. At this time, the pressure of the molding tape increases due to the large curvature of the non-circular cross section, the pressure is insufficient in the small curvature portion, and unevenness of the wall pressure occurs. Also,
Where the pressure is high, the amount of resin is insufficient, and when the pressure is low, the amount of resin is large. An object of the present invention is to propose a tubular body having good moldability and a high degree of freedom in selecting a manufacturing method at the time of manufacturing by selecting a rational material as a resin material forming a prepreg.

[0004]

According to a first aspect of the present invention, a sheet-like prepreg made of a thermoplastic resin and high-strength reinforcing fibers forms a tubular body having a circular cross section, and a part of the tubular body. Is formed in a non-circular cross section, and the operation and effect are as follows.

[0005]

In other words, compared with the thermosetting resin, a part of the tubular body formed into a circular cross section is used to form a non-circular cross section such as a convex portion and a concave portion by utilizing the property that the molding process can be further performed after the molding. Can be formed into

[0006]

As described above, the non-circular cross section can be easily formed only by changing the resin material, and the manufacturing method at the time of manufacturing can be freely selected. Moreover, by making a part of the hollow tubular body into a non-circular cross section, work hardening can be applied to the non-circular cross section. It can be used for parts that are used.

[0007]

According to the second aspect of the present invention, a sheet-like prepreg made of a thermoplastic resin and high-strength reinforcing fiber is wound around a core metal, and further covered with a molding tape. A tubular body having a circular cross section is formed by firing, and the tubular body is heated and softened after decoreing,
A part of this softened tubular body is formed in a non-circular cross section by molding, and its function and effect are as follows.

[0008]

In other words, the tubular body once formed into a circular cross section is forcibly deformed by molding to a part of the tubular body softened by reheating by utilizing the point that the thermoplastic resin is softened by reheating, Form a non-circular cross section. In the step of forming a tubular body having a circular cross section, the pressure of the molding tape becomes uniform due to the circular cross section, so that the high-strength reinforcing fibers and the thermoplastic resin are evenly distributed within the wall thickness of the tubular body. It is possible to obtain a uniform wall thickness. In the process of forming this tubular body with a circular cross section into a non-circular cross section, it is only necessary to heat it to a softening temperature lower than the melting temperature of the resin, the resin does not flow even by molding, and the thickness is uniform and high. It is possible to form a non-circular cross section in which the strength-enhancing fiber and the thermoplastic resin are uniformly dispersed.

[0009]

Therefore, a non-circular cross section can be easily formed by changing the resin material and adding a processing step of reheating and softening the once formed tubular body, and the manufacturing method selection at the time of manufacturing is also reheated. Since it is a material that can be softened by, it can be freely selected. Moreover, by making a part of the hollow tubular body into a non-circular cross section, work hardening can be applied to the non-circular cross section. It can be used for parts that are used.

[0010]

The third aspect of the present invention is characterized in that a sheet-like prepreg made of a thermoplastic resin and high-strength reinforcing fibers is wound around a core metal and further covered with a molding tape. A tubular body having a circular cross section is formed by firing, and the tubular body is heated and softened after decoreing,
In the tubular body in which a part of the softened tubular body is formed in a non-circular cross section by molding, the sheet-like prepreg is a mixture of thermoplastic resin fiber and high strength reinforcing fiber. There are the following effects.

[0011]

In other words, the fact that the thermoplastic resin fiber softens the tubular body once formed into a circular cross section by reheating,
A part of the tubular body softened by reheating is forcibly deformed by molding to form a non-circular cross-section portion in the part of the tubular body.

[0012]

Therefore, a non-circular cross section can be easily formed by changing the resin material and adding a processing step of reheating and softening the once formed tubular body, and the manufacturing method selection at the time of manufacturing is also reheated. Since it is a material that can be softened by, it can be freely selected. Moreover, by forming a part of the hollow tubular body into a non-circular cross section, the non-circular cross section can be worked and hardened. Can be used for required parts. Furthermore, since the prepreg has a structure in which thermoplastic resin fibers and high strength reinforcing fibers are mixed and woven, since the prepreg is flexible even at room temperature, it can be easily wound even on a thin cored bar. Further, since only the resin is not unevenly distributed on the surface of the prepreg and the resin and the reinforcing fiber are mixed at a predetermined ratio, this has the following advantages. (B) Since the thermoplastic resin and the high-strength reinforcing fiber are present substantially evenly on the surface, it is possible to perform the above-mentioned reheating in a short time because the heat conduction is good through the reinforcing fiber having good conductivity. Moreover, since it is not necessary to raise the heating source temperature so much, the burning of the thermoplastic resin is eliminated. (B) In addition, since the thermoplastic resin and the high-strength reinforcing fiber substantially evenly contact the cavity portion surface of the mold, avoiding that only the resin surface adheres to the cavity portion of the mold, A desired non-circular cross section can be formed. (C) Moreover, since the tubular body having a circular cross section is once formed before the molding, the resin can be sufficiently impregnated between the reinforcing fibers when the molding tape is wound and fired. Even after molding the non-circular cross-section, only the fibers are not unevenly distributed in the portion having a large curvature, and the predetermined strength and elastic modulus as the tubular body can be obtained. (D) From the above, it is possible to reduce the wall thickness as a tubular body,
It was lightweight and strong.

[0013]

EXAMPLE As shown in FIG. 1, a thermoplastic resin yarn 9 is used.
And a yarn 10 of high strength reinforcing fiber are woven together to form a sheet-like prepreg 1. This prepreg 1 is used to form a rod material for a fishing rod as a tubular body. (A) The prepreg 1 is placed on the work table 2 and wound around the core metal 3 to form the tubular body 4 having a circular cross section. 3 in this case
The prepreg 1 is wound around the layers, but the orientation of the reinforcing fibers in the innermost layer is set in the circumferential direction, and the prepreg 1 is wound by alternately setting the rod core direction and the circumferential direction from the second layer. (B) As shown in FIG. 2, a molding tape 5 is wound on the tubular body 4 together with the core metal 3 to compact the tubular body 4. (C) The tubular body 4 wound with the molding tape 5 is heated and fired in a furnace. Then, the resin is melt-impregnated between the reinforcing fibers and the three layers of the prepreg 1 are integrated. As shown in FIG. 3, the tubular body 4 thus formed is extracted from the cored bar 3. (D) As shown in FIG. 4, the tubular body 4 is loaded into the split mold 6 while the molding tape 5 is wound around the tubular body 4. Then, as shown in FIG. 5, a part of the tubular body 4 is press-molded while being softened by heating and press-molded into a substantially elliptical shape to form a non-circular cross-section portion A. As shown in FIG. 6, a flat surface that is recessed from the circular cross section is formed in the non-circular cross section A, and this flat surface is used as a reel sheet. By making the recesses in this way, the drop between the guide and the reel can be absorbed. (E) After molding, the molding tape 5 is peeled off.

[Other Embodiments] The non-circular cross section A may have a polygonal shape such as a triangle or a quadrangle so as to form an elbow rest on the rod end. The non-circular cross section A may be a D-shaped cross section, and the flat surface in the D-shaped cross section may be used as the guide mounting surface. The shape of the non-circular cross section A may be convex. As the thermoplastic resin fiber, PET, PA, PP
S, PEEK, etc. can be used. Glass fibers, carbon fibers, and aramid fibers can be used as the high-strength reinforcing fibers. As a mode in which the thermoplastic resin fibers and the high-strength reinforcing fibers are mixed and woven, as shown in FIG. 7, the long fibers 7 of the high-strength reinforcing fibers aligned in one direction and the thermoplastic resin between the long fibers 7 are formed. It is also possible to sandwich the short fiber nonwoven fabric 8 therebetween. The high-strength reinforcing fibers aligned in one direction may be entangled with short fibers of a thermoplastic resin. Further, a single fiber composed of a thermoplastic resin fiber and a high-strength reinforcing fiber may be aligned in one direction and bundled. Further, yarns of high-strength reinforcing fibers aligned in one direction may be mixed in the knitted thermoplastic resin fiber. The high-strength reinforcing fibers are not limited to those aligned in one direction, but may be arranged in a cross shape. The thermoplastic resin may be in the form of a sheet, in which reinforced fibers are impregnated with heat to form the prepreg 1.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a plan view showing a state before winding a prepreg around a cored bar.

FIG. 2 is a perspective view showing a state in which a molding tape is wound around a wound prepreg.

FIG. 3 is a perspective view showing a state of decoreing after firing.

FIG. 4 is a perspective view showing a state before molding.

FIG. 5 is a perspective view showing a state of molding.

FIG. 6 is a perspective view showing a state in which a flat surface is formed on a part of a circular cross section.

FIG. 7 is a cross-sectional view showing a prepreg in which a thermoplastic resin short-fiber nonwoven fabric is sandwiched between reinforcing fibers.

[Explanation of symbols]

 1 prepreg 3 core metal 4 tubular body 5 molding tape A non-circular cross section

Claims (3)

[Claims] 1. A tubular body (4) having a circular cross section is formed by a sheet-shaped prepreg (1) made of a thermoplastic resin and high-strength reinforcing fibers, and a part of the tubular body (4) has a non-circular cross section. A tubular body made of a thermoplastic resin formed in the part (A). 2. A sheet-shaped prepreg (1) made of a thermoplastic resin and high-strength reinforcing fibers is wound around a core metal (3),
Further, a tubular body (4) having a circular cross section is formed by coating with a molding tape (5) and firing, and the tubular body (4) is heated and softened after decoreing, and the softened tubular body ( 4) A method for producing a tubular body made of a thermoplastic resin, wherein a part of 4) is formed in a non-circular cross section (A) by molding. 3. The tubular body made of a thermoplastic resin according to claim 2, wherein the sheet-shaped prepreg (1) is a mixture of a thermoplastic resin fiber and a high-strength reinforcing fiber.