JPH08258165A - Tubular body and its manufacture - Google Patents

Abstract

PURPOSE: To provide a tubular body of high strength and superior durability and also provide its manufacturing method without damaging the design for reducing the weight. CONSTITUTION: In a tubular body, in which a prepreg composed of high strength fiber impregnated with a synthetic resin is wound and a reinforced layer 16 thinner than a main body layer composed of high strength fiber mainly oriented almost in the circumferential direction on the inner peripheral side of a main body layer 14 mainly oriented in the axial length direction is formed, a given thin film 18 composed mainly of thermosetting and thermoplastic synthetic resin is heat molded integrally with the reinforced layer 16 on the further inner side of the innermost surface of the reinforced layer formed by the prepreg.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular body formed by a prepreg in which high strength fiber is impregnated with a synthetic resin.
Therefore, it can be used for a rod pipe of a fishing rod, a shaft of a golf club, or the like.

[0002]

2. Description of the Related Art It has been conventionally known to form a reinforcing layer on the innermost layer of a fishing rod. For example, the actual fairness 2-16628
Japanese Patent Laid-Open Publication No. 6-7923 discloses a fishing rod in which a reinforcing layer is formed by winding a fiber sheet in which the fiber direction is aligned in the circumferential direction in the innermost layer. A structure in which a reinforcing layer in which the fiber direction is oriented in the circumferential direction is formed in the innermost layer in a laminated body having a reduced amount is disclosed. These tubular bodies are usually formed by winding a prepreg sheet around a core metal, applying pressure from the outside with a tightening tape, and pulling out the core metal after heating and curing.

[0003]

However, when the cored bar is pulled out, a strong frictional force is applied to the inner surface of the tubular body from the surface of the cored bar, but the innermost layer in contact with the cored bar has fine irregularities. The reinforcing fiber of the innermost layer surface portion is damaged or cut due to scratches or scratches to reduce the reinforcing effect of the tubular body. In particular, when the amount of synthetic resin impregnated in the prepreg is small, this tendency is remarkable, and the strength is lowered, or the damage of the reinforcing fiber expands due to long-term use and the fiber breakage progresses into the innermost layer and the tubular body is damaged. May lead to.

Therefore, an object of the present invention is to provide a tubular body having high strength and excellent durability and a method for producing the tubular body without impairing weight reduction.

[0005]

SUMMARY OF THE INVENTION In view of the above object, the present invention provides a method of winding a prepreg in which high strength fibers are impregnated with a synthetic resin, and the high strength fibers are oriented mainly in the axial direction. On the side, in the tubular body in which the high-strength fibers are mainly oriented in the substantially circumferential direction and a reinforcing layer thinner than the main body layer is formed, thermosetting is further performed inside the innermost surface of the reinforcing layer formed by the prepreg. Provided is a tubular body, characterized in that an ultrathin coating film composed mainly of a synthetic resin having thermoplasticity or thermoplasticity is integrally formed by thermoforming with the reinforcing layer.

Further, a mold release agent is applied to the core metal, and a material mainly composed of a thermosetting synthetic resin is coated on the mold release agent to form a cured or semi-cured ultrathin film. A prepreg in which high-strength fibers are impregnated with a synthetic resin is wound on the outside of the coating, and the prepreg is pressed from the outside of the prepreg with a pressure member and heat-cured, and the pressure member is removed and the core metal is pulled out. A method for manufacturing a tubular body is provided.

[0007]

The high-strength fiber of the reinforcing layer is directly formed on the core metal because the ultra-thin coating is integrally formed on the inner side of the innermost surface of the thin reinforcing layer in which the high-strength fiber is mainly oriented in the substantially circumferential direction. Contact is prevented, and the direction of pulling out the core metal is the direction crossing the high-strength fiber oriented in the circumferential direction of the reinforcing layer, but the presence of the coating does not damage or cut in the direction crossing the high-strength fiber. The reduction of the reinforcing action of the thin reinforcing layer is prevented, resulting in a high-strength tubular body, and even if it is used for a long period of time, the high-strength fiber does not spread and the durability is excellent. Further, since the coating film is present on the inner side, even if a fishing line, a small-diameter pipe, or a different member such as a part hits the inner side, the high-strength fiber can be protected by the coating film, so that it has durability. Furthermore, since this coating is extremely thin, the weight reduction is not impaired.

In the method, since a cured or semi-cured film is first formed, this film exists between the wound prepreg and the core metal, and even if the core metal is pulled out after heat molding,
The high-strength fibers of the prepreg are prevented from being damaged by the fine irregularities on the surface of the cored bar, and a lightweight, high-strength and durable tubular body can be easily manufactured.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail based on the embodiments shown in the accompanying drawings. FIG. 1 shows a partially cutaway view of a tubular body according to the present invention, FIG. 2 shows an enlarged view of part A, and FIG. 3 shows an enlarged view of part B. The tubular body 10 has a thin outer reinforcing layer 12 and an inner reinforcing layer on the outer surface and the inner surface of a thick intermediate layer (main body layer) 14 formed by a prepreg in which high strength fibers are impregnated with a synthetic resin. A layer 16 is provided, and a coating layer 18 of an extremely thin thermosetting synthetic resin is formed inside the inner reinforcing layer 16. Most of the high-strength fibers of the intermediate layer 14 are oriented in the longitudinal direction, and most of the reinforcing layers 12 and 16 are oriented in the circumferential direction.

A method of manufacturing the tubular body 10 will be described with reference to FIG. The cored bar 20 has a taper shape of about 3/1000 or less or a straight taper shape, and is made of a hard material such as metal. A mold release agent is applied to the surface of the cored bar 20. As the release agent, fluorine resin, silicon resin, or the like is used. A thermosetting synthetic resin is applied extremely thinly thereon. In this embodiment, the epoxy resin is coated by the sprayer 22 (a).

After that, the epoxy resin film is cured by heating,
Alternatively, it is semi-cured. After this, as shown in FIG. 4 (b) and below, the prepreg is wound to form a tubular body.
At this time, if the adhesiveness between the (semi) cured epoxy resin coating and the prepreg is insufficient, a more viscous epoxy resin may be coated on this coating.

A tubular body is formed by using a prepreg obtained by impregnating a high-strength fiber such as carbon fiber, glass fiber, alumina fiber or aramid fiber with a thermosetting synthetic resin such as epoxy resin, phenol resin or unsaturated polyester resin.
In this embodiment, carbon fiber and epoxy resin are used. The prepreg P1 has an aligning sheet 16A whose fiber direction is oriented in the circumferential direction and an aligning sheet 14A which is oriented in the longitudinal direction on the outside. In addition, a small sheet 24 is provided inside the front end of the aligning sheet 16A so as to reinforce the end portion of the tubular body. . After winding this prepreg P1, a longitudinally oriented aligning sheet 14B is arranged on the inside, a circumferentially oriented aligning sheet 12A is arranged on the outer side, and a tubular shape is further provided on the outer edge thereof. The prepreg P2 provided with the woven cloth-like small sheet 26 for reinforcing the end portion of the body is wound (c).

Finally, a clamping tape 28 is used for clamping and pressing (d) to heat and cure. An external mold may be used instead of the tightening tape. After molding, the tightening tape 28 may be removed, the cored bar 20 may be extracted, processed into a desired length dimension, and the outer peripheral surface may be painted or printed for decoration or protection. The winding operation of the prepregs P1 and P2 is not limited to this embodiment, and the number of prepregs, the combination of fiber directions, and the like are arbitrary.

As shown in FIG. 3, a thermosetting synthetic resin coating layer 18 is formed on the inner side of the tubular body 10 thus formed so as to protect the high-strength fibers oriented in the circumferential direction of the inner reinforcing layer 16. However, as can be seen from the description with reference to FIG. 4, the coating layer 18 that was in contact with the surface of the cored bar 20
When the cored bar is pulled out, the inner surface thereof is scratched by the microscopically unevenness on the surface of the cored bar, resulting in a finely concavo-convex portion 18A. However, the high-strength fibers of the reinforcing layer 16 are protected by this coating layer 18 and prevented from being damaged,
The tubular body 10 having high strength and excellent durability can be provided. In addition, the thickness of the reinforcing layer 16 is 50 μm or less, preferably 30 μm or less, and the weight ratio of the resin amount is 50% or less, and the resin amount ratio is as low as that of the main body layer. Is preferable for weight reduction.

The ultra-thin coating layer 18 is thicker than the irregularities on the surface of the cored bar 20 and has a thickness equal to or smaller than the average diameter of the innermost high-strength fiber of the reinforcing layer 16. Therefore, the thickness is usually about 10 microns or less, and the wall thickness is as thin as possible within a range in which the high strength fibers are not rubbed by the surface irregularities when the cored bar 20 is pulled out. Therefore, the weight of the tubular body 10 is hardly increased, and the protection of the high-strength fiber is achieved without violating the weight reduction. Since the coating layer 18 is formed of an epoxy resin of the same system as the epoxy resin used for the prepreg, the adhesiveness is high, and peeling and strength reduction due to temperature change at the time of pulling out the core bar or in the use environment are unlikely to occur. . In addition, if the prepreg uses a polyester resin, the coating layer 18 is made of the same resin so that the coating layer 18 is made of the same resin, so that the adhesion is high.

Although the coating layer 18 of the above embodiment is an epoxy resin, it may be a layer of thermoplastic resin other than such thermosetting synthetic resin, and particles or short fibers may be mixed therein. Good. Reinforcing layer 1 for these particles and short fibers
If particles or staple fibers having a smaller diameter than the high-strength fiber of No. 6 are used, or if a material softer than the high-strength fiber is used, the high-strength fiber of the reinforcing layer will be damaged by these mixed particles or short fibers during drawing. It is possible to prevent an influence such as bending by being pressed or pressed.

As the mixed particles, expandable particles, hollow particles, and other synthetic resin particles can be used, and the expandable and hollow particles contribute to weight reduction. In addition, from the viewpoint of preventing damage, a substantially spherical shape is preferable, but using ceramic particles improves the wear resistance of the tubular body. In addition, if talc (talc) particles, Teflon particles, or silicon particles are used, the slidability is improved, and the withdrawal property is also improved when the core metal is withdrawn. If the particles are made of a flat material, they can be pressed at the time of pressure molding so that the wide surfaces are aligned along the longitudinal direction, and the thickness of the coating layer can be made thin.

Furthermore, the short fibers may be whiskers, but need not be high strength fibers. Wear resistance improves when mixed with whiskers. The mixing ratio of particles and short fibers is 50% or less by volume ratio, and usually 35% or less. Increasing the amount of resin can reduce the influence of the reinforcing layer 16 on the high-strength fiber. By mixing particles or short fibers in this way, even if the coating layer corresponding portion is not cured during heating of the prepreg, the resin flow of the coating layer corresponding portion is suppressed and held in a layered state, and during molding. It is possible to prevent the high-strength fibers of the reinforcing layer 16 from contacting the cored bar.

The ultra-thin coating layer 18 is for preventing damage to the high-strength fibers in the inner layer of the main portion of the tubular body, and is formed in the winding region of the reinforcing small sheets 24, 26. You don't have to.

[0020]

As is apparent from the above description, according to the tubular body of the present invention, an ultrathin coating is formed on the inner side of the layer of the prepreg in which the high-strength fiber direction is substantially the circumferential direction and further inside the thin reinforcing layer surface. Since it is integrally formed, it is possible to prevent the high-strength fibers of the reinforcing layer from directly contacting the core metal, and the core metal pulling is a direction crossing the circumferentially oriented high-strength fibers,
Since the high-strength fiber is not damaged or cut, a high-strength tubular body can be obtained, and even if it is used for a long period of time, the high-strength fiber does not spread and the durability is excellent. Further, since the coating film is present on the inner side, even if a foreign member such as a fishing line, a small-diameter pipe, or a part hits, the high-strength fiber can be protected by the coating film, so that it has durability. Furthermore, since this coating is extremely thin, the weight reduction is not impaired. In the manufacturing method, since a cured or semi-cured film is formed first, this film exists between the wound prepreg and core metal, so even if the core metal is pulled out after heat molding, the high strength of the prepreg The fibers are prevented from being damaged by fine irregularities on the surface of the core metal, and the tubular body can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a tubular body according to the present invention.

FIG. 2 is an enlarged view of part A of FIG.

FIG. 3 is an enlarged view of portion B in FIG.

FIG. 4 is an explanatory view of a tubular body manufacturing method.

[Explanation of symbols]

 10 Tubular Body 12 Outer Reinforcing Layer 14 Intermediate Layer (Main Body Layer) 16 Inner Reinforcing Layer 18 Ultrathin Coating Layer

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // B29L 23:00

Claims (2)

[Claims] 1. A prepreg in which high-strength fibers are impregnated with a synthetic resin is wound, and the high-strength fibers are mainly oriented substantially in the axial direction, and the high-strength fibers are mainly oriented substantially in the circumferential direction. In a tubular body in which a reinforcing layer thinner than the main body layer is formed, an ultrathin film mainly composed of a thermosetting or thermoplastic synthetic resin is further inside the innermost surface of the reinforcing layer formed by the prepreg. A tubular body, characterized in that the film of (1) is heat-molded integrally with the reinforcing layer. 2. A core metal is coated with a release agent, and a material composed mainly of a thermosetting synthetic resin is coated on the release agent to form a cured or semi-cured ultrathin film, A prepreg in which high-strength fibers are impregnated with a synthetic resin is wound around the outside of the coating, pressure is applied from the outside of the prepreg with a pressure member and heat curing is performed, and the pressure member is removed and the core metal is pulled out. And a method for producing a tubular body.