JPH1146631A - Tubular body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a tubular body prevented from bending, reduced in anisotropy and fluctuation, excellent in flexibility and rigidity, and useful as e.g. a fishing rod by constructing a part of a fiber-reinforced prepreg through impregnating a reinforcing fiber having a tensile modulus of a specified value or lower with a specific synthetic resin. SOLUTION: The tubular body is constructed by winding a fiber-reinforced prepreg made by impregnating parallel-arranged reinforcing fibers with a synthetic resin, wherein at least a part of the prepreg is produced by impregnating a reinforcing fiber such as carbon fiber <=20 ton/mm<2> in tensile modulus with a synthetic resin <=110 deg.C in curing temperature such as epoxy resin. It is preferable that the mainbody layer 11 of this tubular body is made up of an inner layer 11a of circumferential fiber prepreg, an intermediate layer 11b on the inner layer 11a consisting of longitudinally oriented fiber prepreg and an outer layer 11c of circumferential fiber prepreg, and a fishline guide 12 provided on the inner wall surface of the body layer 11 is made up of a fiber-reinforced projection 12a and a resin projection 12b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tubular body used for a fishing rod, a golf club shaft and the like.

[0002]

2. Description of the Related Art Conventionally, a fiber reinforced prepreg obtained by impregnating a synthetic fiber into a reinforced fiber that has been aligned has been used for a rod pipe of a fishing rod that is a tubular body. This fiber reinforced prepreg satisfies the requirement that the rod tube has high elasticity and high strength, does not change over time during use for a long period of time, and has a pot life and molding temperature that are easy to use in production. Therefore, as the synthetic resin, a so-called high-temperature curing type thermosetting resin having a relatively high curing temperature of, for example, 120 to 200 ° C. is used.

[0003]

However, a high-temperature curing type thermosetting resin is suitable for obtaining a rod tube exhibiting high rigidity, high strength and specific strength. The difference between the winding temperature (normal temperature) and the molding temperature is large. For this reason, in a fiber reinforced prepreg using a high-temperature curing type thermosetting resin, the obtained rod pipe may bend due to the influence of the coefficient of thermal expansion of the reinforcing fibers and the like. This phenomenon is particularly noticeable in a rod having a relatively small outer diameter, such as a tip rod. If the rod tube is bent as described above, the bent will adversely affect the directionality of the fishing rod, and the deflection will increase, and a good tone cannot be obtained.

[0004] Further, those using such a fiber-reinforced prepreg have extremely high rigidity, and thus are not suitable for a portion requiring easy bending characteristics. It is conceivable to use a synthetic resin sheet or the like that does not use reinforcing fibers in such a portion in order to satisfy the property of easily bending, but the strength of the synthetic resin sheet or the like is too weak to easily apply a load when a load is applied. There is a problem of breaking.

The present invention has been made in view of the above circumstances, and has flexibility, prevents bending, reduces directionality and blur, provides excellent tone, and has excellent specific strength and strength. An object is to provide a tubular body that can exhibit rigidity.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention relates to a tubular body formed by winding a fiber reinforced prepreg obtained by impregnating a synthetic resin into aligned reinforcing fibers. Further, at least a part of the fiber reinforced prepreg is characterized in that a reinforcing fiber having a tensile modulus of 20 ton / mm ² or less is impregnated with a synthetic resin having a curing temperature of 110 ° C. or less.

According to this structure, since a synthetic resin having a curing temperature of 110 ° C. or less is used, the difference between the winding temperature (normal temperature) and the molding temperature is reduced, and the thermal expansion coefficient of the reinforcing fiber is reduced. Can be reduced, and the resulting bending of the tubular body can be suppressed. In addition, by using a reinforcing fiber having a tensile modulus of 20 ton / mm ² or less, sufficient flexibility and sufficient strength can be obtained.

[0008]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the following embodiments, a tubular body of a fishing rod will be described as an example of the tubular body. As described above, in the present invention, at least a part of the fiber-reinforced prepreg constituting the tubular body has a tensile modulus of 20%.
It is characterized in that a reinforcing fiber (low elasticity fiber) having a ton / mm ² or less is impregnated with a synthetic resin (a low-temperature curing type resin) having a curing temperature of 110 ° C. or less. For this reason, in the present embodiment, one rod pipe having a fishing rod may be constituted only by the fiber-reinforced prepreg described above, or one rod pipe may be formed by the fiber-reinforced prepreg described above and It may be constituted by combining a fiber reinforced prepreg using a reinforcing fiber (high elastic fiber) or a synthetic resin (high-temperature curing resin) having a tensile elastic modulus other than the specified tensile elastic modulus or curing temperature. The rod tube having such a configuration is preferably used in a portion where a large diameter is required and sufficient flexibility and strength are required, such as a head rod and a former rod of a hollow rod.

FIG. 1 is a partial longitudinal sectional view showing an embodiment of a rod tube of a fishing rod. In the drawing, reference numeral 1 denotes a rod pipe. This rod tube 1
Is composed of a main body layer 11 formed by winding a fiber reinforced prepreg impregnated with a low-elasticity fiber and a low-temperature setting resin, and a fishing line guide 12 spirally formed on the inner wall surface of the rod tube 1. The fishing line guide 12 is formed so as to protrude from the inner wall surface of the rod tube 1 into a hollow portion of the rod tube 1.

As shown in FIG. 2, the main layer 11 is an inner layer 11a made of a reinforcing fiber prepreg (circumferential fiber prepreg) in which reinforcing fibers are aligned in the circumferential direction of the rod pipe.
And an intermediate layer 11b provided on the inner layer 11a and made of a reinforcing fiber prepreg (axial direction fiber prepreg) in which reinforcing fibers are aligned in the axial direction of the rod pipe.
b, and an outer layer 11c made of a circumferential fiber prepreg.

The fishing line guide 12 formed on the inner wall surface of the main body layer 11 has a fiber-reinforced projection 12a containing reinforcing fibers.
And a resin projection 12b containing a synthetic resin such as a resin that forms the prepreg. In this case, a low elastic fiber or a high elastic fiber may be used as the reinforcing fiber used for the fiber reinforcing protrusion 12a. Further, the resin used for the resin protrusion 12b may be a low-temperature curable resin or a high-temperature curable resin.

The low-temperature curing type synthetic resin constituting the main body layer 11 has a curing temperature of 110 ° C. or lower, preferably about 8 ° C.
The thing of 0-110 ° C is used. Such a low-temperature curable synthetic resin has a small difference between the temperature at the time of winding (normal temperature) and the molding temperature, so that the effect of the thermal expansion coefficient of the reinforcing fibers can be reduced. Specifically, a thermosetting resin such as an epoxy resin or a thermoplastic resin such as a polyetherimide resin can be used as the low-temperature setting resin.

The glass transition temperature of the low-temperature curable resin of the low-temperature low-elasticity resin prepreg is, for example, 80 ° C. or more in consideration of the stability of the molded article against temperature changes in the trunk of a car or the cargo compartment of a ship during transportation. The temperature is preferably about 100 ° C.

[0014] Tensile modulus of the low elastic fibers constituting the body layer 11, 20ton / mm ² or less, preferably 10ton / mm ² or less, and more preferably not more than 7 ton / mm ^2. Examples of the material of such a reinforcing fiber include an acrylic resin, a rayon-based material, a pitch-based material, and glass fiber. In particular, the low-elasticity reinforcing fiber is preferably an acrylic resin fiber having a specific gravity of 1.5 g / cm ³ or less.

Further, a fiber-reinforced prepreg (high-temperature resin prepreg) containing a high-temperature-curable resin or a fiber-reinforced prepreg (high-temperature resin prepreg) containing a low-temperature-curable resin and a low-elasticity fiber You may use in combination the member comprised by the fiber reinforced prepreg containing a high elastic fiber (high elastic prepreg). in this case,
In the production of the rod tube, after setting or winding the high-temperature resin prepreg and curing the high-temperature curing resin in relation to the curing temperature, disposing or winding the low-temperature low-elastic resin prepreg and curing the low-temperature curing resin And a method of arranging or winding a high-temperature resin prepreg and a low-temperature low-elasticity resin prepreg, curing the low-temperature curing resin, and then curing the high-temperature curing resin.

The synthetic resin content of the low-temperature low-elasticity resin prepreg is preferably 25% by weight or more in consideration of the elasticity, strength, weight, rigidity after molding, and winding workability of the composite material. The resin impregnation amount is preferably 40% by weight or more, particularly preferably 50 to 80% by weight, in order to reduce the elasticity and improve the adhesion to a mandrel or the like. When a high-temperature resin prepreg is used in combination, even in the case of a low-temperature-curable synthetic resin having a relatively high viscosity, the synthetic resin content of the high-temperature resin prepreg (15 to 35% by weight) is considered in consideration of moldability. It is desirable to raise it.

The thickness of the low-temperature low-elasticity resin prepreg is preferably 0.08 mm or less, particularly preferably 0.05 mm or less, in consideration of the molding thickness of the tip (prevention of uneven thickness). When a high-temperature resin prepreg is used in combination, it is desirable that the thickness be smaller than the thickness (0.05 to 0.20 mm) of the high-temperature resin prepreg in consideration of prevention of bending.

In the structure of the main body layer, the ratio of (axial length fiber prepreg) / (circumferential fiber prepreg) of the low-temperature low-elastic resin prepreg is 1.0 to 5.times. In consideration of improvement in rigidity and prevention of crushing. It is preferably 0 times. Also,
When a combination of high-temperature resin prepregs is used, the ratio is preferably larger than that in the high-temperature resin prepreg in consideration of prevention of bending. In this case, the rigidity of the rod tube is adjusted by increasing the diameter. Thereby, the bending of the rod pipe can be sufficiently prevented.

There is no particular limitation on the direction in which the low elasticity fibers of the low temperature low elasticity fiber reinforced prepreg are aligned. That is, the alignment direction of the low elasticity fibers may be the axial direction, the circumferential direction, or may be inclined at a predetermined angle, for example, ± 45 ° from the axial direction. Or you may comprise with a woven fabric and a nonwoven fabric.

In consideration of the elasticity, strength and weight reduction of the composite material (tubular body), the low elastic fiber content of the low temperature low elastic fiber reinforced prepreg is 30% by weight or more, especially 60% by weight of the entire rod pipe.
It is preferred that the content be at least 10% by weight. By using the low-temperature low-elastic fiber reinforced prepreg having such a low elastic fiber amount, the prepreg is lightweight, has low elasticity, is hardly damaged even by large bending, and can have improved strength.

Examples of the shape of the low-temperature low-elasticity fiber-reinforced prepreg include a tape shape and a sheet shape. The number of windings of the low-temperature low-elasticity fiber-reinforced prepreg is not particularly limited, and may be variously changed depending on the use, required characteristics, and the like. However, in consideration of rigidity, strength, and weight, the number is preferably 1 to 6 turns. By winding with such a number of turns, the stability of strength can be improved, and the flexibility can be further improved.

Further, there is no particular limitation on the thickness, fiber content, resin impregnation amount, etc. of the fiber-reinforced prepreg other than the low-temperature low-elasticity fiber-reinforced prepreg. However, when a low-temperature low-elasticity fiber-reinforced prepreg is used in combination with another fiber-reinforced prepreg, the thickness of the fiber-reinforced prepreg is determined in consideration of the rigidity of the composite material. 1/2 to 1 of the thickness of the reinforced prepreg
It is preferable that the fiber amount of the fiber-reinforced prepreg is 1/2 to 1/1 of the fiber amount of the low-temperature low-elasticity fiber-reinforced prepreg in consideration of uneven thickness and rigidity.
The resin impregnation amount is preferably 0 times, and the resin impregnation amount of the fiber-reinforced prepreg is １ ／ of the resin impregnation amount of the low-temperature low-elasticity fiber-reinforced prepreg in consideration of strength and rigidity.
It is preferably up to 1/10 times.

In the present invention, when the low-temperature low-elastic fiber reinforced prepreg is used for a rod pipe of a fishing rod, for example, there are the following embodiments. (1) A sheet-like low-temperature low-elasticity fiber-reinforced prepreg or a sheet having a width of about 5 to 10 mm and a thickness of about 0.01 to 0.03 mm, which is provided on any one of the outer layer, the intermediate layer and the inner layer of the rod pipe. Fishing rod constructed using tape-shaped low-temperature low-elastic fiber reinforced prepreg.

In this fishing rod, the condition of the rod is flexible, and the rod has such strength that it does not break even when bent. Also,
Since the elongation of the low elastic fiber is about 2%, which is close to the elongation of the synthetic resin in the prepreg, it is possible to prevent the low elastic fiber from peeling off from the synthetic resin. (2) A fishing rod having a rod tube made of a sheet or tape-like low elastic fiber reinforced prepreg containing a low elastic fiber having a specific gravity of 1.5 g / cm ³ or less.

This fishing rod has a flexible tone and is light in weight, so that it has little weight. (3) A fishing rod formed by winding one (one turn) or more low-temperature low-elastic fiber reinforced prepreg over a predetermined length (for example, about 50% of the rod pipe) in or near the outermost layer of the rod pipe.

In this fishing rod, since the impact from the outside can be absorbed by the low-temperature and low-elasticity fiber-reinforced prepreg constituting the outermost layer, the fiber-reinforced prepreg constituting the inner layer can be protected. In addition, since the outermost layer has higher strength than the protective layer made of only the synthetic resin, it can withstand external impact. (4) A relatively low temperature and low elasticity fiber reinforced prepreg is disposed at the tip of the rod tube of the head rod, and the low temperature and low elasticity fiber reinforced prepreg is not disposed at other portions or disposed at a small ratio. Fishing rod having a bent rod tube.

In this fishing rod, the tip of the tip is easy to bend and the fish signal (round) is easy to take. In addition, since the hollow rod uses low-elasticity fibers, even if the inside diameter of the rod tip is increased, a soft tone similar to that of a soft thin rod other than the hollow rod can be obtained. In addition, since the inside diameter of the rod tip can be increased, the resistance of the fishing line inserted through the rod pipe can be reduced. (5) A fishing rod having a rod tube formed by winding a sheet-like low-temperature low-elastic fiber reinforced prepreg obtained by aligning reinforcing fibers in one direction.

In this fishing rod, since a low-temperature low-elasticity fiber-reinforced prepreg in the form of a sheet is wound around the fishing rod, it can be laminated with a uniform thickness. Variation can be prevented, whereby the strength can be improved even when low-elasticity fibers are used, and a uniform rod can be obtained. (6) Tensile modulus is 7 ton / mm ² or less, preferably 2.5 ton / mm ²
A fishing rod having a rod tube formed by winding at least one or more low-temperature low-elastic fiber reinforced prepregs having a ton / mm ² or less in a predetermined range. In particular, a fishing rod using the low-temperature and low-elasticity fiber-reinforced prepreg in a tip rod tube.

This fishing rod is easy to bend and excellent in condition. Further, since fibers exist as a reinforcing material rather than a rod tube formed only of resin, even if it has low elasticity, it can contribute to strength improvement and stabilize strength as a product.

Next, an example of a method of manufacturing a rod pipe in the above-mentioned fishing rod will be described with reference to FIG. First, the surface of the core 21 is coated with a release agent such as a fluororesin or synthetic wax. Next, a projection forming tape 22 such as a fluorine tape, a resin tape, or a reinforcing fiber tape is wound around the core metal 21 at an interval corresponding to the width of the projection. At this time, a tape (typically 0.2 mm to 1.0 mm) having a thickness corresponding to the height of the projection is used as the projection forming tape 22.

Next, a fishing line guide forming member 23 made of a fiber reinforced prepreg obtained by impregnating the aligned reinforcing fibers with a synthetic resin, a bundle of fibers, a synthetic resin member, a ceramic member, a metal member and the like is used. Wrap up. The winding of the fishing line guide forming member 23 may be performed together with the winding of the projection forming tape 22. When the fishing line guide forming member 23 is a fiber reinforced prepreg, after winding the fishing line guide forming member 23, a fastening tape is wound thereon, and the fiber reinforced prepreg of the fishing line guide forming member 23 is cured. After that, it is preferable to remove the fastening tape and then wind the fiber reinforced prepreg of the main body layer.

Next, an inner layer prepreg 24 which is a circumferential fiber prepreg, an intermediate layer prepreg 25 which is an axial fiber prepreg, and an outer layer prepreg 26 which is a circumferential fiber prepreg are sequentially wound thereon. These inner layer prepreg 24 and intermediate layer prepreg 2
5 and the outer layer prepreg 26 have a tensile modulus of 2
0ton / mm ² or less, the low temperature preferably is 10ton / mm ² or less, particularly preferably 7 ton / mm ² or less is reinforcing fibers the curing temperature (molding temperature) is 110 ° C. or less, and preferably impregnated with 80 to 110 ° C. Use low elastic resin prepreg.

The prepreg 24 for the inner layer and the prepreg 26 for the outer layer include a low-temperature high-elastic resin prepreg (a fiber-reinforced prepreg using a low-temperature curable resin and a high-elastic fiber) and a high-temperature low-elastic prepreg (a high-temperature curable resin and a low-temperature resin). Fiber-reinforced prepregs using elastic fibers) or high-temperature high-elasticity prepregs (fiber-reinforced prepregs using high-temperature-curable resin and high-elasticity fibers) can also be used.

Next, after a tightening tape is wound thereon and tightened, the prepreg of the low-temperature low-elastic resin is molded at a curing temperature of a low-temperature curing resin. Thereafter, the core metal 21 is pulled out by a conventional method, the inner projection forming tape 22 is removed, and the outer fastening tape is removed to complete the rod pipe.

Since the difference between the temperature at the time of winding (normal temperature) and the forming temperature is small, the influence of the thermal expansion coefficient of the reinforcing fiber can be reduced in the rod tube obtained in this manner. The bend is suppressed. Further, it has sufficient flexibility and sufficient strength.

In the above embodiment, the case where the body layer 11 is formed after the fishing line guide forming member 23 composed of the fiber reinforced prepreg is wound and the fiber reinforced prepreg is cured, but the fiber reinforced prepreg is formed. Is wound, and a low-temperature resin prepreg constituting the main body layer 11 is further wound thereon, and the main body is cured at a curing temperature (for example, 100 ° C.) of the low-temperature curable resin constituting the main body layer 11. After the layer 11 is cured, the fishing line guide forming member 23 may be cured at a curing temperature (for example, 130 ° C.) of the high-temperature curable resin constituting the fishing line guide forming member 23.

In addition to the manufacturing method shown in FIG.
For example, as shown in FIG. 4, a low-temperature low-elasticity fiber-reinforced prepreg 31 and a fiber-reinforced prepreg 3
2, 33 are wound separately in sequence, or adjacent prepregs are appropriately superposed and wound,
After that, it can be manufactured by a process such as fastening by taping, heat hardening, removal of a mandrel, removal of a tape, and polishing. FIG. 5 is a longitudinal sectional view of the rod pipe 2 manufactured in this manner. The fiber-reinforced prepregs 32 and 33 may be low-temperature low-elasticity fiber-reinforced prepregs, low-temperature high-elasticity resin prepregs, high-temperature low-elasticity prepregs, or high-temperature high-elasticity prepregs. This rod tube has sufficient flexibility like the above, prevents bending of the rod tube, reduces directionality and blurring, exhibits excellent tone, and exhibits excellent specific strength and rigidity can do.

In this case, the proportion of the low elasticity fiber in the rod pipe is preferably 50% or more, and more preferably 65 to 95%. Further, the space factor of the low elasticity fiber in the thickness of the rod tube is preferably 50% or more, and more preferably 65 to 95%. Further, the resin impregnation amount of the low-temperature low-elasticity fiber reinforced prepreg 31 is preferably larger than the resin impregnation amount of the fiber reinforced prepregs 32 and 33. By defining in this manner, it is possible to obtain a rod tube in which the tip is soft and the base is hard, and the difference in rigidity between the tip and the base is large.

As shown in FIG. 6, the rod pipe is formed by laminating a circumferential fiber sheet 42 thinner than the axial fiber sheet 41 on the axial fiber sheet 41, Winding, then tightening by taping, taping, heat curing, mandrel removal, tape removal,
It is also possible to produce a rod tube through a process such as polishing.

In this case, the same effect as described above can be obtained by forming at least one of the axial length fiber sheet 41 and the circumferential fiber sheet 42 from a low-temperature low-elastic fiber reinforced prepreg.

In the embodiment described above, carbon fibers, glass fibers, metal fibers, aramid fibers, ceramic fibers, and the like can be used as the reinforcing fibers used in the high-temperature resin prepreg or the high elasticity prepreg. Examples include epoxy resin, urethane resin, polyester resin and the like.

The embodiment of the present invention has been described above.
The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the technical idea. For example, the fiber diameter of the reinforcing fiber, the number of turns of the prepreg, the curing conditions of the synthetic resin, and the like can be appropriately changed.

In the above-described embodiment, a fishing rod is described as an example to which the present invention is applied. However, the present invention can be applied to a golf club shaft, a tennis racket, a badminton racket, a ski pole, and a bicycle in addition to a fishing rod. The present invention can be applied to a case of a frame or the like. In this case, the low-temperature and low-elasticity fiber-reinforced prepreg as described above is appropriately used according to the required characteristics of each applied member.

[0044]

As described above, the tubular body of the present invention
A fiber reinforced prepreg obtained by impregnating a reinforcing fiber having a tensile elasticity of 20 ton / mm ² or less with a synthetic resin having a curing temperature of 110 ° C. or less has sufficient flexibility to bend the tubular body. , The directionality and blur can be reduced, and excellent tone can be exhibited, and excellent specific strength and rigidity can be exhibited.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing an embodiment in which a tubular body of the present invention is applied to a rod tube of a fishing rod.

FIG. 2 is a cross-sectional view of the rod pipe shown in FIG. 1 taken along line AA.

FIG. 3 is a view for explaining an example of a method of manufacturing the rod pipe shown in FIG.

FIG. 4 is a view for explaining a manufacturing method different from the manufacturing method of the rod pipe shown in FIG. 3;

5 is a longitudinal sectional view of a rod pipe obtained by the manufacturing method shown in FIG.

FIG. 6 is a view for explaining a manufacturing method different from the manufacturing method of the rod pipe shown in FIGS. 3 and 4;

[Explanation of symbols]

 1, 2 rod tube 11 main body layer 11a inner layer 11b intermediate layer 11c outer layer 21 core metal 24 prepreg for inner layer 25 prepreg for intermediate layer 26 prepreg for outer layer 31 low-temperature low-elastic resin fiber reinforced prepreg 32, 33 fiber reinforced prepreg 41 axial fiber Sheet 42 A circumferential fiber sheet.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08J 5/24 B29C 67/14 X // B29K 105: 08 B29L 23:00

Claims (1)

[Claims] 1. A tubular body formed by winding a fiber reinforced prepreg obtained by impregnating a synthetic resin into a aligned reinforcing fiber, wherein at least a part of the fiber reinforced prepreg has a tensile modulus of 20 ton. / tubular body mm ² or less curing temperature reinforcing fibers are characterized by a structure impregnated with synthetic resin is 110 ° C. or less.