JPH0341061B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention [Field of Industrial Application] The present invention relates to a method for manufacturing a laminated tube that is applied to, 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 above-mentioned sheet rolling manufacturing method includes impregnating the above-mentioned high-strength fibers with a thermosetting resin and cutting the semi-cured prepreg into trapezoidal shapes, winding this around a core metal and wrapping a tape around the outer periphery, or The outer mold is clamped and pressurized, heated and hardened, and after cooling, the tape is removed, the outer mold is removed, and the core is removed to obtain a laminated tube. The following steps are required.

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 prepregs vary widely depending on the material of the yarn, the thickness of the prepreg, warp yarn, weft yarn density, etc., which requires a very large space for cold storage and is difficult to manage.

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

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

(3) Rolling...Place the cross-attached core metal on the table and roll it under pressure.

(4) Taping... After rolling, wrap a cellophane, polyester, etc. tape around the outer circumference with a tension of 3 to 5 kg, or tighten the outer mold.

(5) Firing: Place in a heating furnace and heat at 100 to 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) Both ends cutting...Cut the material to the specified size.

(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 an accuracy of ±0.02.

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

Structure of the molded product (laminated pipe) (1) In the sheet rolling method, there is always a start and end of the roll, and this overlapping part a is shown in Figure 6-I.
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 threads are broken at the overlapped part a, so peeling is likely to occur) (3) Also, an overlapped part a of the warp threads occurs. As a result, a uniform wall thickness cannot be obtained in the circumferential direction, and defects such as bending (distortion) during molding are likely to occur, and the weight of the overlapped portion a increases.

For example, in the case of an overlap of 36 degrees as shown in FIG. 7, the weight increases by 10% compared to a case with no overlap.

(4) When the prepreg b is cut into trapezoids and isosceles trapezoids as shown in Figure 8 A and B, the longitudinal fibers change as shown in the figure with respect to the axial direction (0 degrees) of the core c. As the angle increases, the physical property values decrease.

(5) Similarly, when the weft thread is angled, it becomes as shown in Figure 9 A and B and Figure 10 A and B, respectively.

Figure 9 A and B show the case of a scalene trapezoid;
Figure 0 A and B show the case of an equilateral trapezoid, and 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, in the case of a normal scalene trapezoid, there are problems such as the worst situation, and also,
As is known from the publication, the first layer is constructed using the filament winding method, and an appropriate number of vertical fibers of different lengths such as short fibers, medium fibers, and long fibers are taken and bundled with one end aligned. , a synthetic resin is infiltrated into a molded product with equal fiber density in each cross section and hardened into a cone shape to create a fiber reinforced resin cone with a size that is several divisions of the circumference of the core metal. A second layer is arranged around the circumference of the first layer, and a third layer is formed on the outer periphery with a large helical angle by the filament winding method, and a fourth layer is formed with a large helical angle in the opposite direction. A method of manufacturing a laminated pipe is known in which the thickness of the tapered resin pipe as a whole can be made uniform, and the fiber density in the cross section can be made equal.

However, according to this method, to make a fiber-reinforced resin cone, short fibers, medium fibers, and long fibers are aligned and bundled, and the fiber density of each cross section is made uniform, and then synthetic resin is infiltrated into the cone shape. The curing process is a separate process, and a large number of fiber-reinforced resin cones are required to make one laminated pipe.
In the filament winding process using the large helical angle of the fourth layer, the short pieces were made into straight bundles.
There was a problem that the medium and long fibers were bent, resulting in a decrease in strength.

[Problems to be Solved by the Invention] Therefore, the present invention eliminates the problems of the above-mentioned conventional method, and makes it possible to obtain lightweight and high strength, as well as easy work and inexpensive molding. That is the purpose.

B. Structure of the invention [Means for solving the problem] That is, the present invention uses a woven yarn made of high-strength fiber, a plurality of continuous warp yarns arranged radially with respect to a core bar, and gaps between these warp yarns. warp threads cut in units of at least two arranged radially to fill the space;
These warp yarns and a plurality of continuous weft yarns that are orthogonal to each other are used to weave a fabric using the core bar as a reference, and this fabric is woven in multiple layers at the same time, thereby layering the material. After impregnating the material with a thermosetting resin and semi-drying, the material is pressurized by a conventional method to harden it, and then the pressure is released and the core is removed to obtain a laminated tube, thereby obtaining the above-mentioned material. It solved the problem.

〔Example〕

Examples of the method of the present invention will be described in detail below.

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

High-strength fibers such as graphite, carbon, and glass are used as constituent materials.

In this case, the type of constituent material mentioned above is only the yarn size and material type, for example, in the case of carbon, 1000 filaments (φ7μ x 1000 pieces)
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, 105, 150, 175, 200, 225, and 250.

Obtain yarn wound around a bobbin or shuttle, and set this on the 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 above-mentioned yarn orthogonally around the outer circumference 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 as shown in FIG. 2, the warp 2 has a plurality of continuous warp threads 2a,
It consists of at least two cut warp threads 2b arranged so as to fill the gaps between the warp threads 2a, and the cut warp threads 2b are arranged on the larger diameter side of the tapered core bar 1. On the other hand, the weft threads 3 are arranged continuously so that weaving starts from the proximal end 1a of the core bar 1 and ends at the distal end 1b, and the weaving density of the weft threads 3 is as shown in FIG. As shown in the basic weft density changes, the density is denser on the proximal end 1a side of the core bar 1, and the density is gradually coarser on the intermediate part 1c from the proximal end side to the distal end side. It is changed and woven.

Also, 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. 3, so the warp threads 2 are woven inward. They approach each other at a predetermined distance.

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 of books decreases to 4, and when the weaving is completed, the number returns 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.

In this way, a thermosetting resin (e.g. epoxy resin, polyester resin) is woven around the outer periphery of the core bar 1.
After impregnating a predetermined amount of the layered material, semi-drying it, and removing the solvent, taping or attaching an outer mold to the outer periphery of this layered material is applied, pressure is applied, and the material is heated to a temperature of 100 to 150 degrees.
After heating and curing at ℃ for 2 hours, the core bar 1 is separated from the cured material, the tape or outer mold is removed, both ends are cut to the desired length, and the outer diameter is polished and matched. Then, the laminated pipe is obtained by painting.

The structure of the laminated pipe 5 formed in this way is as follows:
As shown in Figure 4, a material 4 with uniform thickness on the circumference
A was obtained, 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 Figure 5 A to F, and the inner warp threads 2 and weft threads 3 of this structure are made of high-strength threads such as graphite, carbon, Kepler, and glass. Either can be used. Figure 5 A to F show an example of the cross-sectional structure of a laminated pipe. In A, all three layers are crossed; in B, both the inner and outer layers are crossed; in the middle layer, only the warp 2 is crossed; in C, the inner layer is crossed. , the middle layer has only 2 warps, and the outer layer has 3 wefts.
Only, D is the inner layer has 3 weft threads, the middle layer has only 2 warp threads, and the outer layer is cloth; E has the inner layer is cloth, the middle layer is cloth, and the outer layer is only warp 2; However, the outer layer is only the weft thread 3.

〔Effect of the invention〕

As explained above, according to the method of manufacturing a laminated pipe for fishing rods, etc. of the present invention, a cylindrical fabric is layered by weaving the front woven yarn with a core metal as a reference, and this is impregnated with a thermosetting resin. This makes the weaving work extremely easy, and the method of weaving with yarn prepreg pre-impregnated with a thermosetting resin is difficult to weave and does not improve work efficiency. However, according to the method of the present invention, the thermosetting resin impregnated with the yarn prepreg dripped onto the traveling path of the yarn prepreg, and it adhered to various parts of the loom, staining the machine. , the weaving efficiency can be significantly improved compared to the above method, and the types of raw materials are reduced compared to the conventional method, the consumption of thermosetting resin is also reduced, and the stock space is reduced and Management becomes capacity, various weaving structures and material structures can be selected arbitrarily, and weaving can be done at high speed in accordance with the core metal, resulting in excellent productivity and significant cost reductions. Since the tube 5 is formed to have a uniform wall thickness on the circumference, the occurrence of defective products due to bending and warping is extremely reduced, and since there are no overlapping parts, there is no directionality, and the warp threads 2 are aligned with the core metal 1. Since the fibers are arranged radially so that the angle is always 0°, weight, rigidity, and strength can be improved by about 10% compared to conventionally formed laminated pipes. The weft threads 3 can be woven into any desired density, making it possible to form a high-strength, lightweight laminated pipe. , has many excellent advantages.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the core metal and weft arrangement density in the method for manufacturing laminated pipes such as fishing rods according to the present invention, Fig. 2 is an explanatory diagram showing an example of warp arrangement in the same method, and Fig. 3 is an explanatory diagram showing the same method. FIG. 4 is a schematic cross-sectional view of a laminated tube formed by the same method, and FIGS. Each schematic cross-sectional view showing an example of a multilayer structure of a molded laminated pipe with a partial cross section,
Figures 6A, 6B and 6C are schematic cross-sectional views of the material formed by the conventional sheet rolling method, Figure 7 is an explanatory diagram showing the overlapping part of the material in the conventional method, and Figure 8A, B is a plan view showing the relationship between the prepreg and the core bar in the conventional method, and FIGS. They are each side view and each arrow direction view. DESCRIPTION OF SYMBOLS 1...Core metal, 2...Warp thread, 2a...Multiple continuous warp threads, 2b...Two cut warp threads, 3...Weft thread, 4...Weaving fabric.

Claims (1)

[Claims] 1 High-strength fiber is used as a woven yarn, and a plurality of continuous warp threads are arranged radially with respect to the core bar, and warp threads cut in units of at least two warp threads are arranged radially to fill the gaps between the warp threads. A fabric is woven with the core metal as a reference using these warp yarns and a plurality of continuous weft yarns that are perpendicular to each other, and this fabric is simultaneously woven in multiple layers to layer the material. The material is impregnated with a thermosetting resin, semi-dried, and then pressurized and cured by a conventional method, and then the pressure is released and the core is removed to obtain a laminated pipe. A method of manufacturing laminated pipes for fishing rods, etc.