JPS6230095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a laminated tube used for, for example, fishing rods, golf shafts, badminton racket shafts, and the like.

Conventionally, boron, carbon, Kepler, glass,
A sheet rolling manufacturing method is known as a method for manufacturing laminated tubes made of high-strength fibers such as graphite.

The sheet rolling production method described above involves impregnating the high-strength fibers with a thermosetting resin and cutting the semi-cured prepreg into trapezoids, winding this around a core metal and wrapping a tape around the outer periphery, or The mold is clamped and pressurized, heated and cured, and after cooling, the tape is
The laminated tube is obtained by removing the outer mold and removing the core metal, but this manufacturing method requires the following steps.

On the material manufacturer side When making one-way aligned prepreg (1) Arrange the yarn bobbins.

(2) Spread the aligned yarn to make the thickness uniform.

(3) A thermosetting resin film, which has been finished to a predetermined thickness, is welded to the aligned yarns using hot melt.

(4) Attach release paper and separate film to this.

(5) Pack and ship the completed prepreg.

At this point, the types of prepreg vary widely, depending on the yarn material, prepreg thickness, warp, weft density, etc., and they require a very large refrigerator/freezer space and are difficult to manage.

On the molding manufacturer's side: (1) Cutting: The obtained prepreg is unpacked, and the roll is stretched and cut into trapezoids.

(2) Cloth attachment: Paste the cut prepreg onto the core coated with release agent and adhesive using an iron, etc.

(3) Rolling...Place the core metal that has been cross-attached on the table and roll it in while applying pressure.

(4) Taping... After rolling, tape the outer circumference of Heselophane, polyester, etc.
Wrap it around with a tension of ~5Kg or clamp the outer mold.

(5) Firing: Place in a heating furnace and heat at 100-150°C for 2 hours to harden.

(6) Core metal separation: Separate the core metal and the hardened material.

(7) Removal of tape or outer mold...The blown out resin makes it difficult to remove the tape and remove the outer mold, so use tape or outer mold coated with a release agent.

(8) Double-end cutting: Cutting the material to the specified dimensions.

(9) External mold polishing: Polish with abrasive paper, etc. to remove steps or parting lines created by the tape on the surface of the material. At this time, the fibers are polished and cut, resulting in a significant decrease in strength.

(10) Sealing processing...In the case of fishing rods, the joints are particularly processed to achieve an accuracy of ±0.02.

(11) Painting: Apply a topcoat after sealing, curing, and polishing processes.

Structure of the molded product (laminated pipe) (1) In the sheet rolling method, there is always a beginning and end of rolling, and this overlap part a is shown in Figure 1
As shown in (c), this occurs in at least one or more locations.

(2) This causes a decrease in the strength of the overlapped part (particularly when compressed, the weft is broken at the overlapped part a, so peeling is likely to occur).

(3) Also, due to the occurrence of the warp overlap part a, uniform wall thickness cannot be obtained in the circumferential direction, so defects such as bending (distortion) during molding are likely to occur, and the weight of the overlap part a increases. occurs.

For example, in the case of an overlap of 36 degrees as shown in FIG. 2, the weight increases by 10% compared to a case without an overlap.

(4) When prepreg b is cut into trapezoids and isosceles trapezoids as shown in Figures 3A and 4A, the vertical fibers are As shown in FIG. 4B, the physical property values decrease as the angle increases.

(5) Similarly, if the weft is also angled, Figure 3 C and 4
The result will be as shown in Figure C.

FIG. 3C shows the case of a scalene trapezoid, and FIG. 4C shows the case of an equilateral trapezoid. In the case of a scalene trapezoid, there is no connection between the weft threads because the weft does not return to the starting position. On the other hand, in the case of an equilateral trapezoid, it returns to the starting position.

Changes in the angles of these warp and weft threads significantly reduce the physical properties.

In addition, in the sheet rolling method, all the weft threads are independent and cut, so if the single weft threads do not overlap, the strength in the transverse direction (circumferential direction) will be significantly reduced. Therefore, the worst situation is in the case of a normal scalene trapezoid.

The present invention aims to eliminate the drawbacks of the conventional manufacturing method described above, and uses a yarn prepreg made by impregnating high-strength fiber with a thermosetting resin and semi-curing it as a woven yarn, and woven yarn prepreg radially to the core metal. A core is formed by a plurality of continuous warp threads arranged, a warp thread cut in units of at least two radially arranged to fill the gaps between the warp threads, and a plurality of continuous weft threads orthogonal to these warp threads. A fabric is woven using gold as a reference, and this fabric is woven in multiple layers at the same time to form a layered material. After the material is pressurized and cured by a conventional method, the pressure is released, The main idea is to obtain a laminated pipe by removing the core metal, which is lightweight and has high strength.
Moreover, the purpose is to provide a method for manufacturing laminated pipes such as fishing rods that can be formed at low cost.

The method of the present invention will be explained in detail below based on specific examples.

First, the steps of the method of the present invention will be explained.

The constituent material used is yarn prepreg, which is made by semi-curing high-strength fibers such as graphite, carbon, and glass impregnated with a predetermined amount of thermosetting resin.

In this case, the type of constituent material mentioned above is only the size and material type of the yarn prepreg, for example, in the case of carbon, 1000 filaments (φ7μ x 1000 filaments)
0.0667g/m 3000 〃 (φ7μ×3000 pieces) 0.2g/m 6000 〃 (φ7μ×6000 pieces) 0.4g/m Only the above three types are sufficient.

In the case of sheets, the fiber weight (g) per 1 ^m2 is
Nine types were required: 55, 75, 100, 150, 175, 200, 225, and 250.

Yarn prepreg is obtained wound around a bobbin or shuttle, and this is set on a loom.

Input the specifications of the laminated pipe Number of warp yarns (for each layer) Warp yarn cutting position and number (for each layer) Weft yarn density (for each layer) and density change position Length Weaving start position Core bar coated with release agent and adhesive Insert into loom.

Depending on the weaving process input, it is also possible to weave with only 0 warp threads (only weft threads) and 0 threads only with weft threads (only warp threads).Thus, the method of the present invention, as shown in FIG.
A woven fabric is woven by arranging warp threads 2 and weft threads 3 made of the yarn prepreg at right angles around the outer periphery of the core bar 1, and this is woven with the core bar 1 set on a loom.

Further, the warp threads 2 are arranged radially at appropriate intervals in the length direction of the core bar 1, and the weft threads 3 are arranged perpendicularly thereto.
are arranged, and the warp threads 2 are made up of a plurality of continuous warp threads 2a and at least two cut warp threads 2b arranged so as to fill the gaps between the warp threads 2a, warp yarn 2b
are arranged on the larger diameter side of the tapered core bar 1, as shown in FIG.
starts weaving from the base end 1a of the core bar 1, and starts weaving from the base end 1b of the core bar 1.
They are arranged consecutively so that the weaving ends at
In addition, the weave density of the weft thread 3 is dense on the proximal end 1a side and the distal end part 1b side of the core bar 1, as shown in the basic weft density change in FIG. It is woven with varying density so that it becomes gradually coarser from the proximal end side to the distal end side.

Furthermore, when the fabric 4 is woven with the warp threads 2 and weft threads 3 arranged as described above, the tension of the weft threads 3 acts in the direction of arrows P and P in FIG. 7, so the warp threads 2 are squeezed inward and mutually , and are at a predetermined interval.

Moreover, the cut warp yarns 2b are made into multiple units with different lengths, as illustrated in FIG.
It is arranged with one end aligned with the base end portion 1a of the core metal 1.

Then, the fabric 4 is simultaneously woven into a desired multilayer structure to form a layered material.

The weaving speed is 1m/30 at a weft density of 4 threads/cm.
Seconds are possible.

Further, the cut warp threads 2b are cut and simultaneously held in a position unrelated to weaving, while the continuous warp threads 2a are cut and held when weaving is completed.

Therefore, if the number of warp threads 2 is 10 at the start of weaving, there are 8 and 6 warp threads.
The number will gradually decrease to 4, and when the aperture is completed, it will return to 10 as at the initial start.

On the other hand, the weft threads 3 are in a continuous state without being cut, and are pulled out as the core bar 1 is fed while the weaving is stopped.

The next core metal is fed in a continuous state with the previous core metal, and weaving is then started from the specified weaving start position.

The outer periphery of the layered material woven and layered on the outer periphery of the core bar 1 was taped or fitted with an outer mold, pressurized, and then placed in a heating furnace and heated at 100 to 150°C for 2 hours to harden. After that, the core bar 1 is separated from the hardened material, the tape or outer mold is removed, both ends are cut to the desired length, and the outer diameter is polished.
Laminated pipes are obtained by laminating and painting.

The structure of the laminated tube formed in this way, as shown in FIG. 8, provides a material 5 with uniform thickness on the circumference, with no overlapping of vertical fibers and no openings.

Since the weft yarn 3 is continuous, the compression strength has been improved by 20% compared to conventional products.

By obtaining a material with uniform thickness, the weight was reduced by 10%, and bending and warping of the material was halved.

Since the warp threads 2 are arranged radially with respect to the core bar 1, both rigidity and strength are improved by 10%.

The angle of the weft thread 3 changes depending on the feed pitch, but since it is continuous, the compressive strength is improved.

The structure of the multilayer loom can be any structure shown in Fig. 9 A to F, and the materials of the inner warp threads 2 and weft threads 3 of this structure may be graphite, carbon, Kepler,
Any high strength thread such as glass can be used. Figure 9 A to F show an example of the cross-sectional structure of a laminated pipe. , the middle layer has only warp 2, the outer layer has only weft 3,
D has only 3 weft threads in the inner layer, only warp threads in the middle layer, and cloth in the outer layer; E has cloth in the inner layer and cloth in the middle layer;
The outer layer has only warp threads 2, the inner layer has only weft threads, the middle layer has only warp threads, and the outer layer has only weft threads.

As explained above, according to the method for manufacturing laminated pipes for fishing rods, etc. according to the present invention, the types of raw materials are reduced,
Reduces stock space and makes management easier.
In addition, various weave structures and material structures can be selected arbitrarily.
Moreover, since the weaving is done quickly in accordance with the core metal 1, productivity is excellent and costs can be reduced.Also, since the laminated pipe is formed with a uniform wall thickness on the circumference, defective products with bending and warping are avoided. There is less generation, and since there are no overlapping parts, there is no directionality, and the weight can be reduced by 10% compared to the laminated tube obtained by the conventional method.Furthermore, the warp threads 2 are arranged radially so that they are always at 0° with respect to the core metal 1. So rigid,
Both strength can be improved by 10% compared to that obtained by conventional methods,
Furthermore, since the fibers are arranged evenly at any position in the circumferential direction, smooth bending without any curls can be obtained, and the weft threads 3 can be woven to any desired density, making it possible to form with the minimum necessary weft threads. This method has many advantages, such as being able to form a high-strength, lightweight laminated tube and eliminating any material loss caused by cutting the prepreg as in conventional methods.

[Brief explanation of the drawing]

Figure 1 A, B, and C are schematic cross-sectional views of the material formed by the conventional sheet rolling method, Figure 2 is an explanatory diagram showing the overlapping part of the material in the conventional method, and Figure 3 I and Fig. 4A are plan views showing the relationship between the prepreg and core bar in the conventional method, and Figs. 3B and 4B are explanations showing examples of warp yarn arrangement of materials obtained by the conventional method. Figure 3C and Figure 4C are explanatory diagrams respectively showing examples of the weft arrangement of materials obtained by conventional methods, and Figure 5 is the core bar and weft in the method for manufacturing laminated pipes for fishing rods, etc. according to the present invention. FIG. 6 is an explanatory diagram showing an example of the arrangement of warp yarns in the same method; FIG. 7 is a partially enlarged plan view of a fabric showing an example of the arrangement of warp and weft yarns in the same method; FIG. The figure is a schematic cross-sectional view of a laminated pipe formed by the same method, and FIGS. It is a diagram. 1...core bar, 2a...multiple continuous warp threads,
2b... Two cut warp threads, 3... Weft thread, 4... Woven fabric.

Claims (1)

[Claims] 1 A yarn prepreg made by impregnating high-strength fiber with a thermosetting resin and semi-curing is used as a woven thread, and a plurality of consecutive warp threads are arranged radially around the core metal, and the gaps between these warp threads are filled. A woven fabric is woven with a core bar as a reference by warp threads arranged radially and cut in units of at least two, and a plurality of continuous weft threads orthogonal to these warp threads, and the woven fabric is simultaneously multi-layered. A fishing rod characterized in that the material is layered by weaving, the material is pressurized and hardened by a conventional method, and then the pressure is released and the core is removed to obtain a laminated pipe. Method for manufacturing equal laminated pipes.