JP2000351163A - Tubular molding and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a breakage or a decrease in a strength due to an increase in a weight or a decrease in a quality level by setting a resin content of one or more fiber-reinforced resin layers each for reinforcing a circumferential direction without gap in a plurality of fiber-reinforced resin layers to a specific ratio. SOLUTION: A resin content of at least one circumferentially oriented fiber- reinforced resin layer of the tubular molding obtained by laminating a plurality of fiber-reinforced resin layers is set to 13 to 25 wt.%. An upper limit value and a lower limit value of a width of reinforcing fiber for forming the resin layer of a low resin content are set to a predetermined value from a point of a reinforcing efficiency. As a reinforcing fiber bundle, a carbon fiber, a glass fiber, an aramid fiber or the like is used. As the resin for constituting the tubular molding, a resin used for a fiber reinforcing resin such as an epoxy resin, unsaturated polyester resin, vinyl ester resin or the like is used. The resin layer is formed by winding the bundle on a mandrel or one or more fiber- reinforced resin layers on a yet uncured fiber-reinforced resin layer on the mandrel. Thus, a strength having a quality level can be improved without largely altering a weight at a low material cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tubular molded product and a method for producing the same.

[0002]

2. Description of the Related Art When a tubular molded body is manufactured using a prepreg sheet (hereinafter referred to as a UD prepreg) in which reinforcing fibers are aligned in one direction, the fiber direction of the reinforcing fibers and the longitudinal direction of the tubular molded body coincide with each other. It is manufactured.

On the other hand, since the strength of the UD prepreg in the direction perpendicular to the fiber direction is significantly lower than the strength in the fiber direction, for example, a thin UD prepreg is wound in the circumferential direction with the fiber direction as the circumferential direction, or the UD prepreg is previously thinned. Reinforcing in the circumferential direction has been attempted by winding a prepreg around a slit tape which is slit into a narrow width in parallel with the fiber direction.

[0004] JP-A-61-14939 discloses that
In order to satisfy both weight reduction and high strength at the same time, it is described that a fiber strip not impregnated with a synthetic resin is spirally wound from one end to the other end of the tubular molded body, thereby reinforcing in a circumferential direction. ing.

[0005]

However, when a conventional thin UD prepreg is used in the circumferential direction, there are the following problems.

(1) It is necessary to manufacture a thin UD prepreg. (2) A portion of the thin UD prepreg in which the openness of the reinforcing fiber is poor appears in the form of a bamboo node on the surface of the tubular molded body, and the quality deteriorates and may be broken. (3) When a thin UD prepreg is wound in the circumferential direction, the cut portion of the fiber is substantially in the direction along the longitudinal direction of the tubular molded body. This may cause a vertical crack in the molded product.

[0007] In order to prevent the above (3), a thin UD prepreg is wound longer than the circumference to create an overlapping portion. For example, a long rod of about 10 m such as an ayu rod is used. In the case of (1), the weight increase is remarkable. In order to prevent the above problem, a slit tape is used, but in this case, there are the following problems.

(4) Even in this case, it is necessary to produce a thin UD prepreg. (5) The UD prepreg needs to be slit parallel to the fiber direction. (6) Since it is necessary to temporarily make a thin UD prepreg, the circumferential reinforcing layer also contains a resin having a resin content of 30% by weight or more,
Therefore, the resin content of the circumferential reinforcing layer of the tubular molded product is also 3%.
It becomes 0% by weight or more, and the weight increases.

(7) Since the cross section of the slit tape is substantially rectangular, if it is spirally and densely wound around a tapered material such as a rod, the slit tape will be arranged stepwise, and When a PP tape or the like is spirally wound and molded,
A space is created between the slit tape and the lower prepreg,
It inhibits adhesion after molding and causes a decrease in strength. (8) Since the slit tape has a small width, a large amount of winding on the bobbin may cause winding collapse. For this reason, the winding amount is limited to about 200 m, and it is necessary to frequently replace the slit tape during the production.

[0010] In order to solve these problems, a method of directly winding a fiber strip has been proposed. However, in this case, there are also the following problems. (9) Since the reinforcing fiber bundle is wound slightly ahead of the preceding cellotape (registered trademark), the pitch at which the reinforcing fiber bundle is wound is the same as the pitch of the cellotape. (10) The reinforcing fiber bundle is widened by winding, but since the cellophane tape winding pitch is large relative to the widening width, the reinforcing effect at a portion not reinforced by the reinforcing fiber strip is reduced, and the tubular body is broken when bent. Easier to do.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art. A first gist of the present invention is a tubular molded product obtained by laminating a plurality of fiber reinforced resin layers, and the resin content of the fiber reinforced resin layer that reinforces the circumferential direction without at least one layer gap is reduced. 13-2
5% by weight of the tubular molding.

It is preferable that the resin content of the fiber reinforced resin layer that reinforces the circumferential direction without gaps is 13 to 20% by weight. It is further preferable that the reinforcing fiber bundle constituting the fiber reinforced resin layer having a resin content of 13 to 25% by weight has a width of 3 to 8 mm.

[0013] Further, a second gist of the present invention is to provide a method for manufacturing a tubular molded body comprising a plurality of fiber reinforced resin layers laminated, wherein the uncured fiber reinforced resin layer formed on the cored bar is formed on the core metal. The reinforcing fiber bundle containing substantially no resin is widened in advance without gaps to form at least one reinforcing fiber layer, and then heated under pressure to form a reinforcing fiber bundle forming the reinforcing fiber layer. A third aspect of the present invention is a method of manufacturing a tubular molded body in which a plurality of fiber-reinforced resin layers are laminated. Is wound without gaps to form at least one reinforcing fiber layer, on which an uncured fiber-reinforced resin layer is provided, and then heated under pressure to form the reinforcing fiber layer. Of a tubular molded product that impregnates resin into the fiber bundle In the manufacturing method.

[0014] The reinforcing fiber bundle to be wound without gaps preferably has a width of 3 to 8 mm, and the reinforcing fiber bundle has a width of 4 to 6 m.
More preferably, it has a width of m.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION (Tubular molded article) The tubular molded article of the present invention is a tubular molded article formed by laminating a plurality of fiber reinforced resin layers, and the resin content of at least one fiber reinforced resin layer. Is from 13 to 25% by weight from the viewpoint of achieving both a reduction in weight and an increase in strength of the tubular molded body. It is particularly preferable that the fiber-reinforced resin layer having a low resin content is a layer in which the reinforcing fiber bundle is substantially oriented in the circumferential direction, since the crushing strength can be improved while maintaining the bending strength of the tubular molded body.
The lower limit of the width of the reinforcing fiber bundle forming the fiber-reinforced resin layer having a low resin content is preferably 3 mm from the viewpoint of the reinforcing efficiency, and more preferably 4 mm. The upper limit of the width of the reinforcing fiber bundle forming the fiber-reinforced resin layer having a low resin content is 8 mm.
Is preferred from the viewpoint of reinforcement efficiency, and 6 mm is more preferred.

[0016] The reinforcing fiber bundle constituting the tubular molded body of the present invention comprises:
There is no particular limitation as long as it is a reinforcing fiber bundle generally used for a fiber-reinforced resin, and examples thereof include carbon fiber, glass fiber, and aramid fiber.

[0017] In the present invention, as the resin constituting the tubular molded body,
There is no particular limitation so long as it is a resin generally used for a fiber reinforced resin, and examples thereof include an epoxy resin, an unsaturated polyester resin, and a vinyl ester resin. Although the molding temperature is high, a thermoplastic resin can also be used.

The tubular molded article of the present invention is a molded article formed by laminating a resin layer reinforced with reinforcing fibers, and is suitably used for golf club shafts, fishing rods and the like. The tubular molded body may be a so-called straight taper having no taper in the longitudinal direction, or may have a taper whose diameter changes in the longitudinal direction.

(Method of Manufacturing Tubular Molded Body) The reinforcing resin substantially free of a resin used in the method of manufacturing a tubular molded body of the present invention refers to a reinforcing resin which does not contain a matrix resin usually used for the above-mentioned tubular molded body. As long as it is not reinforced fiber,
Although not particularly limited, carbon fiber, glass fiber, aramid fiber, metal fiber and the like can be mentioned. In order to suppress the fluffing of the reinforcing fiber bundle during the production of the tubular molded body, it is preferable to use a reinforcing fiber bundle to which a sizing agent has been applied. From the viewpoint of ease of resin impregnation, a smaller amount is preferable. In the present invention, it is preferable to use a reinforcing fiber that has been opened because of the ease of impregnation described below.

In the present invention, pre-spread reinforcing fibers produced by the suction opening method disclosed in WO97 / 41285 and JP-A-11-172562 are particularly preferably used. The lower limit of the spread width of the pre-spread reinforcing fiber bundle used in the present invention is preferably 3 mm from the viewpoint of the reinforcing efficiency, and is preferably 4 m.
m is more preferred. The upper limit value of the spread width is also preferably 8 mm, more preferably 6 mm, from the viewpoint of the reinforcing efficiency.

In the present invention, the method of forming a reinforcing fiber layer is performed by winding the reinforcing fiber bundle around a core metal or a fiber-reinforced resin layer formed on the core metal and not yet cured. In the present invention, it is necessary to form at least one reinforcing fiber layer.

The resin used in the present invention is not particularly limited as long as it is generally used for the above-mentioned tubular molded article, and examples thereof include an epoxy resin, a vinyl ester fiber, and an unsaturated polyester fiber. Among them, epoxy resins are preferred as they are excellent in various physical properties.

The present invention utilizes the fact that the resin flows out during the molding and hardening of the UD prepreg by heating and pressing. At that time, the resin is impregnated into the reinforcing fiber layer at the same time as the resin flows out, and is simultaneously cured and integrated, so that the tubular molded body can be molded, and the excess resin is impregnated into the reinforcing fiber layer and used, so that cost is reduced. Is reduced.

[0024] In the present invention, means for applying pressure at the time of molding the tubular molded article is not particularly limited, but a method utilizing a tape wound with a polyester film and shrinking by heating during molding is preferably used. Used.

[0025] The reinforcing fiber bundle is generally 1000 to 500.
Since the bobbin is wound on the bobbin in units of 0 m, it is not necessary to frequently replace the bobbin during the manufacturing, and the manufacturing cost can be reduced. At the same time, since no prepreg is manufactured, processing costs in the manufacturing can be suppressed.

[0026]

The following is a specific example. In the examples, “% by weight” is simply indicated as “%”. (Example 1) Carbon fiber UD prepreg MR370C125S manufactured by Mitsubishi Rayon Co., Ltd. (carbon fiber MR40, basis weight 125 g / m ² , resin content 25%) and carbon fiber UD prepreg TR330K020 manufactured by Mitsubishi Rayon Co., Ltd.
(Carbon fiber TR30, basis weight 23 g / m ² , resin content 4
0%) were overlapped so that the fiber directions were orthogonal to each other, to obtain a stacked prepreg. This was wound around a 10 mmφ core metal such that TR330K020 was on the inner layer side and the fiber direction of MR370C125S was the longitudinal direction. Thereafter, high-strength high-elasticity carbon fibers HR40-2M (2000 filaments) manufactured by Mitsubishi Rayon Co., Ltd., which had been widened to 4 mm in advance, were wound on MR370C125S at a pitch of 4 mm. Further, a 12 mm-width polyester tape is wound thereon at a pitch of 2.5 mm and cured in a curing oven adjusted to 130 ° C., and has an inner diameter of 10 mmφ and an outer diameter of 11 m.
An mφ tubular molded body was obtained. The resin was impregnated and cured to the outer periphery, and weighed 16.03 g per meter. HR40-2
The resin content of the layer formed by winding M was 20%.

(Example 2) High-strength high-elasticity carbon fiber HR40-2M (2
000 filaments) was wound around the core at a pitch of 4 mm, and the carbon fiber UD prepreg MR370C125S manufactured by Mitsubishi Rayon Co., Ltd. was wound with the fiber direction aligned with the longitudinal direction of the core. Furthermore, a high-strength high-elasticity carbon fiber H manufactured by Mitsubishi Rayon Co., Ltd.
R40-2M (2000 filaments) was wound at a pitch of 4 mm. A 12 mm polyester tape was wound thereon at a pitch of 2.5 mm, and then cured in a curing oven adjusted to 130 ° C., with an inner diameter of 10 mm and an outer diameter of 11 m.
An mφ tubular molded body was obtained. The resin was impregnated and cured to the outer periphery, and weighed 15.26 g per meter. At this time, the resin content of the inner layer, the intermediate layer, and the outer layer (layer formed by winding HR40-2M) of the obtained molded product was 16% and 20%, respectively.
%, 16%.

(Example 3) Carbon fiber UD prepreg SRX350A110S manufactured by Mitsubishi Rayon Co., Ltd. (fiber tensile elasticity 50 t / mm ² , fiber weight 100 g / m ² , resin content 15%) and HRX350E026S (fiber tensile elasticity 40 t / mm ² , fiber weight 26 g / m ² ,
HRX350E026 using resin content 30%)
S is wound on a 10 mmφ straight mandrel in the direction in which the fiber direction coincides with the circumferential direction.
A110S was wound in a direction in which the fiber axis of two layers coincided with the axial direction. Furthermore, a high-strength and high-elasticity carbon fiber HR40-2M manufactured by Mitsubishi Rayon Co., Ltd., which was previously expanded to a width of 4 mm
Was wound at a pitch of 4 mm without any gap, and then a PET tape having a width of 12 mm was wound at 2.3 mm and a tension of 5 kg, and then cured in a curing furnace adjusted to 130 ° C. to obtain a tubular molded body. The resin had been impregnated and cured to the outer periphery. Inner layer, middle layer,
The resin content of the outer layer (layer formed by winding HR40-2M) was 28%, 14%, and 14%.

(Example 4) Carbon fiber UD prepreg HSX350B130S manufactured by Mitsubishi Rayon Co., Ltd. (fiber tensile elasticity 46 t / mm ² , fiber weight 125 g / m ² , resin content 20%) and HRX350E026S (fiber tensile elasticity 40 t / mm ² , fiber weight 26 g / m ² , resin content 30%).
Is wound on a 10 mmφ straight mandrel in the direction in which the fiber direction coincides with the circumferential direction, and HSX350B
130S is wound in a direction in which the fiber axis of two layers coincides with the axial direction, and high-strength high-elasticity carbon fibers HR40-2M (2000 filaments) manufactured by Mitsubishi Rayon Co., Ltd., which has been widened in advance to a width of 4 mm, are wound without gaps at a pitch of 4 mm. , Then 12m
After a PET tape having a width of m was wound at 2.3 mm and a tension of 5 kg, it was cured in a curing furnace adjusted to 130 ° C. to obtain a tubular molded body. The resin had been impregnated and cured to the outer periphery. The resin content of the inner layer, intermediate layer, and outer layer (layer formed by winding HR40-2M) was 28%, 19%, and 19%.

(Example 5) Carbon fiber UD prepreg HSX350B130S manufactured by Mitsubishi Rayon Co., Ltd. (fiber tensile elasticity 46 t / mm ² , fiber weight 125 g / m ² , resin content 20%) and HRX350E032S (fiber tensile elasticity 40 t / mm ² , fiber weight 26 g / m ² , resin content 30%), and HRX350E032S
Is wound on a 10 mmφ straight mandrel in the direction in which the fiber direction coincides with the circumferential direction, and HSX350B
130S is wound in a direction in which the fiber axis of the two layers coincides with the axial direction, and high-strength and high-elasticity carbon fibers HR40-2M manufactured by Mitsubishi Rayon Co., Ltd., which has been widened in advance to a width of 4 mm, are wound without gap at a pitch of 3 mm, and then 12 mm wide Was wound at 2.3 mm and a tension of 5 kg, and then cured in a curing furnace adjusted to 130 ° C. to obtain a tubular molded body. The resin had been impregnated and cured to the outer periphery. At this time, the inner diameter of the obtained tubular molded body was 10 mmφ, the outer diameter was 10.8 mmφ, and the weight per unit length was 21.8 g. Using the jig shown in Fig. 1 and comparing the strength with an outer span of 500 mm, an inner span of 150 mm, and a load speed of 10 mm / min, the strength was 46 kg. At this time, the resin content of the inner layer, the intermediate layer, and the outer layer (the layer formed by winding HR40-2M) of the obtained molded product is 28%, 19%, and 19%, respectively.
%Met.

(Comparative Example 1) Carbon fiber UD prepreg HSX350B130S manufactured by Mitsubishi Rayon Co., Ltd. (fiber tensile elasticity 46 t / mm ² , fiber weight 125 g / m ² , resin content 20%) and HRX350E032S (fiber tensile elasticity 40 t / mm ² , fiber weight 26 g / m ² , resin content 30%), and HRX350E032S
Is wound on a 10 mmφ straight mandrel in the direction in which the fiber direction coincides with the circumferential direction, and HSX350B
130S is wound in a direction in which the fiber axis coincides with the axial direction for two layers, and HRX350E032S is wound in one layer so that the fiber axis direction coincides with the circumferential direction. Thereafter, a 12 mm wide PET tape is 2.3 mm in tension and 5 kg in tension. After winding with 130
The mixture was cured in a curing furnace adjusted to ° C to obtain a tubular molded body. The inner diameter of the obtained tubular molded body is 10 mmφ, and the outer diameter is 10.8.
mmφ, and the weight per unit length is 21.8 g
Met. Using the jig shown in FIG. 1, the outer span is 350 mm, the inner span is 150 mm, and the load speed is 10 mm.
When the strength was compared at / kg, the weight was 39 kg. At this time, the resin content of the inner layer, the intermediate layer, and the outer layer of the obtained molded article was 30%, 20%, and 30%, respectively.

(Example 6) Carbon fiber UD prepreg HSX350B130S manufactured by Mitsubishi Rayon Co., Ltd. (fiber tensile elasticity: 46 t / smm, fiber weight: 125 g / m ² , resin content: 20%) and HRX350E026S (fiber tensile elasticity: 40 t / mm) ² , HX350E026S using a fiber basis weight of 26 g / m ² and a resin content of 30%).
Is wound on a 20 mmφ straight mandrel in the direction in which the fiber direction coincides with the circumferential direction, and HSX350B
130S is wound in a direction in which the fiber axis of three layers coincides with the axial direction, and high-strength high-elasticity carbon fibers HR40-2M (2000 filaments) manufactured by Mitsubishi Rayon Co., Ltd., which has been widened in advance to a width of 4 mm, are wound without gaps at a pitch of 3 mm. , Then 12m
After winding a PET tape having a width of 2.3 m at 2.3 mm and a tension of 5 kg, a PET tape having a width of 12 mm was wound again with a width of 2.3 m.
m, and wound with a tension of 5 kg and cured in a curing furnace adjusted to 130 ° C. to obtain a tubular molded body. The resin had been impregnated and cured to the outer periphery. The obtained tubular molded body has an inner diameter of 20 mmφ and an outer diameter of 2 mm.
It was 0.7 mmφ. This was cut at a length of 10 mm, and the circumferential compressive strength measured at a load speed of 5 mm / min as shown in FIG. 2 was 4.1 kg per unit cm. Also, the inner layer, intermediate layer, and outer layer (HR40-2M)
), The resin content of each layer is 28%,
19% and 19%.

(Comparative Example 2) Carbon fiber UD prepreg HSX350B130S manufactured by Mitsubishi Rayon Co., Ltd. (fiber tensile elasticity 46 t / mm ² , fiber weight 125 g / m ² , resin content 20%) and HRX350E026S (fiber tensile elasticity 40 t / mm ² , fiber basis weight 26 g / m ² , resin content 30%).
Wrap a 0 mmφ straight mandrel in the direction in which the fiber direction coincides with the circumferential direction, and coat HSX350B13 on the outer layer.
0S is wound in a direction in which the fiber axis for three layers coincides with the axial direction,
One layer of HRX350E026S is wound around the outer circumference so that the fiber direction is the circumferential direction, and then 12 mm wide PET
After winding the tape made of 2.3 mm and the tension of 5 kg, the PET tape having a width of 12 mm was 2.3 mm again and the tension of 5 kg.
And cured in a curing furnace adjusted to 130 ° C. to obtain a tubular molded body. The resin had been impregnated and cured to the outer periphery. The obtained tubular molded body had an inner diameter of 20 mmφ and an outer diameter of 20.7 mmφ. This was cut at a length of 10 mm, and the circumferential compressive strength measured at a load speed of 5 mm / min as shown in FIG. 2 was 3.9 kg per cm. The resin content of the inner layer, the intermediate layer, and the outer layer of this molded product is 30%, 20%, respectively.
30%.

(Example 7) Using CG tape (MR370C125S03) manufactured by Mitsubishi Rayon Co., Ltd., the UD prepreg was wound around four layers with the fiber direction of the UD prepreg matched to the longitudinal direction of the core metal of 10 mmφ with the glass thin prepreg inside the inner layer. Thereafter, a polyester tape having a width of 12 mm was wound thereon at a pitch of 2.5 mm, and then cured in a curing furnace adjusted to 130 ° C. to have an inner diameter of 10 mmφ and an outer diameter of 10.9 mm.
A tubular molded body weighing 26.8 g per 1 mm mm was obtained. A temporary fixing agent (product name: MRS-3) manufactured by Mitsubishi Rayon Co., Ltd. is applied to this outer layer, and then the high-strength high-elasticity carbon fiber HR manufactured by Mitsubishi Rayon Co., Ltd.
40-2M (2000 filaments) was wound on a UD prepreg at a pitch of 4 mm. After a polyester tape having a width of 12 mm was wound thereon at a pitch of 2.5 mm, it was cured in a curing furnace adjusted to 130 ° C. The resin was impregnated and cured to the outer periphery, and the outer diameter was 11.1 mmφ, and the weight per 1 m was 28.5 g. At this time, a tubular molded body reinforced with reinforcing fibers and a tubular molded body not reinforced with an outer layer were used for the outer layer obtained, and a jig shown in FIG.
When the strength was compared at 50 mm, inner span 150 mm, and load speed 10 mm / min, 48 kg was not reinforced by this method, and 5 kg was reinforced by this method.
It became 4 kg. In addition, the outer layer (H
The resin content of the layer formed by winding R40-2M) was 19%.

(Example 8) Using a CG tape (MR370C125S03) manufactured by Mitsubishi Rayon Co., Ltd., four layers of UD prepreg were wound with the fiber direction of the UD prepreg matching the longitudinal direction of the core metal of 10 mmφ with the glass thin prepreg inside the inner layer. Thereafter, a polyester tape having a width of 12 mm was wound thereon at a pitch of 2.5 mm, and then cured in a curing furnace adjusted to 130 ° C. to have an inner diameter of 10 mmφ and an outer diameter of 10.9 mm.
A tubular molded body weighing 26.8 g per 1 mm mm was obtained. A resin film R340R-7R manufactured by Mitsubishi Rayon Co., Ltd. (epoxy resin, basis weight 7 g /
m ² ), and then high-strength high-elasticity carbon fiber HR40-2M manufactured by Mitsubishi Rayon Co., Ltd.
(2000 filaments) was wound on a UD prepreg at a pitch of 4 mm. After wrapping a 12 mm wide polyester tape thereon at 2.5 mm pitch,
And cured in a curing oven adjusted to The resin is impregnated and hardened to the outer circumference, and the outer diameter is 11.1 mmφ, and the weight per meter is 2
It became 9.2 g. At this time, a tubular molded body reinforced with reinforcing fibers and a tubular molded body not reinforced with the outer layer were used for the outer layer obtained, and the outer span was 500 m using a jig shown in FIG.
m, inner span 150 mm, load speed 10 mm / min.
It became 54 kg to kg. In addition, the outer layer of the obtained molded body (a layer formed by winding HR40-2M)
Was 20%.

(Comparative Example 3) Using a CG tape (MR370C125S03) manufactured by Mitsubishi Rayon Co., Ltd., four layers of UD prepreg were wound with the fiber direction of the UD prepreg matching the longitudinal direction of the core metal of 10 mmφ with the glass thin prepreg inside the inner layer. Thereafter, a polyester tape having a width of 12 mm was wound thereon at a pitch of 2.5 mm, and then cured in a curing furnace adjusted to 130 ° C., with an inner diameter of 10 mmφ and an outer diameter of 10.9 mm.
A tubular molded body weighing 26.8 g per 1 mm mm was obtained. On this outer layer, a resin film R340R-7R manufactured by Mitsubishi Rayon Co., Ltd. (epoxy resin, basis weight 7 g / s)
m), and thereafter, the high-strength high-elasticity carbon fiber HR40-2M manufactured by Mitsubishi Rayon Co., Ltd.
(2000 filaments) was wound on a UD prepreg at a pitch of 4 mm. After wrapping a 12 mm wide polyester tape on it at 2.5 mm pitch,
And cured in a curing oven adjusted to The resin has been impregnated and cured to the outer periphery, and the outer diameter is 11.1 mmφ, and the weight per meter is 2
It became 9.2 g. At this time, a tubular molded body reinforced with reinforcing fibers and a tubular molded body without reinforcing the outer layer were used for the outer layer obtained, and the outer span was 500 m using a jig shown in FIG.
When the strength was compared at a load of 10 mm / min, the inner span was 150 mm, and the load was 10 mm / min.
The resin content of the outer layer of this molded product was 19%.

(Embodiment 9) Inner diameter 10 mmφ, outer diameter 12 mmφ
A temporary fixing agent (product name: MRS-3) manufactured by Mitsubishi Rayon Co., Ltd. is applied to this outer layer using an aluminum pipe manufactured by Mitsubishi Rayon Co., Ltd. 2M (2000 filaments) was wound on a UD prepreg at a pitch of 4 mm. A 2.5mm 12mm polyester tape
After winding at a pitch of mm, the composition was cured in a curing furnace adjusted to 130 ° C. The resin had been impregnated and cured to the outer periphery. The resin content of the outer layer (layer formed by winding HR40-2M) of the obtained molded body was 19%.

(Example 10) Inner diameter 10 mm, outer diameter 12 mm
Using a φ aluminum pipe, apply a resin film R340R-7R (epoxy resin, weight per unit area: 7 g / sm) manufactured by Mitsubishi Rayon Co., Ltd. to this outer layer.
4m high-strength high-elasticity carbon fiber HR40-2M (2000 filaments) manufactured by Mitsubishi Rayon Co., Ltd.
It was wound on a UD prepreg at m pitch. 1 on it
After winding a 2 mm width polyester tape at a pitch of 2.5 mm, the tape was cured in a curing furnace adjusted to 130 ° C. The resin had been impregnated and cured to the outer periphery. At this time, the resin content of the outer layer (a layer formed by winding HR40-2M) of the obtained molded body was 19%.

[0039]

According to the present invention, it is possible to overcome the problems of the prior arts (1) to (8). That is,
It is possible to realize the improvement of the strength of the tubular molded body while maintaining the quality while reducing the material cost without largely changing the weight.

[0040]

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a jig for measuring bending strength.

FIG. 2 is a conceptual diagram of a jig for measuring crushing strength. Reference Signs List 1 load cell 2 indenter 3 tubular molded body 4 aluminum bush 5 plate

Claims (9)

[Claims] 1. A tubular molded product obtained by laminating a plurality of fiber-reinforced resin layers, wherein the resin content of the fiber-reinforced resin layer for reinforcing the circumferential direction without any gap between at least one layer is 13 to 25% by weight. Tubular molded body. 2. The tubular molded article according to claim 1, wherein the resin content of the fiber reinforced resin layer for reinforcing the circumferential direction without gaps is 13 to 20% by weight. 3. The tubular molded article according to claim 1, wherein the reinforcing fiber bundle constituting the fiber-reinforced resin layer having a resin content of 13 to 25% by weight has a width of 3 to 8 mm. 4. The tubular molded article according to claim 1, wherein the reinforcing fiber bundle constituting the fiber reinforced resin layer having a resin content of 13 to 25% by weight has a width of 4 to 6 mm. 5. A method for producing a tubular molded body comprising a plurality of fiber reinforced resin layers laminated, wherein a substantially widened fiber reinforced resin layer formed on a cored bar and not yet cured is preliminarily expanded. Wrapping reinforced fiber without resin without gap,
A method for producing a tubular molded body in which at least one reinforcing fiber layer is formed and then heated under pressure to impregnate a resin into a reinforcing fiber bundle forming the reinforcing fiber layer. 6. A method for producing a tubular molded body comprising a plurality of fiber-reinforced resin layers laminated, wherein at least one layer of a reinforcing fiber bundle substantially free of resin, which is preliminarily widened on a cored bar, is wound without gaps. Forming a reinforcing fiber layer, providing an uncured fiber reinforced resin layer thereon, and then applying pressure and heating to impregnate the reinforcing fiber bundle forming the reinforcing fiber layer with a resin. . 7. The reinforcing fiber bundle to be wound without gaps is 3 to 8.
The method for producing a tubular molded article according to claim 5, wherein the molded article has a width of 7 mm. 8. The reinforcing fiber bundle to be wound without gaps is 4 to 6.
The method for producing a tubular molded article according to claim 5, wherein the molded article has a width of 7 mm. 9. The method for producing a tubular molded product according to claim 5, wherein the reinforcing fiber bundle which contains substantially no resin and which has been widened in advance is opened by suction opening.