JP2596587Y2 - Fiber reinforced plastic cylinder - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] This invention is based on synthetic resin film,
Fiber reinforced plastic (FRP) suitable for manufacturing rolls for transporting paper, cloth, etc., contact rolls used in the winding process of these synthetic resin films, paper, cloth, etc., and rolls for printing presses ) It relates to a cylindrical body.

[0002]

2. Description of the Related Art Conventionally, most rolls are made of metal such as steel or aluminum alloy. Among them, those made of aluminum alloy occupy the mainstream because they are relatively lightweight and have high rigidity. However,
In recent years, lighter FRP rolls have attracted attention.

[0003] As such a roll made of FRP, for example, a roll described in JP-A-2-238930 is known. In this roll, the reinforcing fiber is laid in the innermost layer with respect to the cylinder axis direction in a range of ± 75 to 90.
Arranged at an angle, it is arranged at an angle of 0 to ± 35 ° in the outermost layer. However, this conventional roll has a problem that the innermost layer has many voids and cracks, or the innermost layer is partially lifted up.

That is, in a roll made of FRP, stress is generated by heating and cooling during forming. In addition, a metal plating layer may be formed on the surface, a metal tube may be covered, or a rubber layer may be formed. In this case, stress is also generated. These stresses are mainly applied in the radial direction, and the stress is mainly supported by the innermost layer in which the reinforcing fibers are arranged at ± 75 to 90 ° with respect to the cylinder axis direction. Therefore, in order for the innermost layer to integrally share the stress, the strength between the reinforcing fibers in the innermost layer is required, and the interlayer strength between the adjacent layers is required. However, especially when the molding is performed by the filament winding method, the filament winding method winds the resin-impregnated reinforcing fibers one after another on the mandrel. Therefore, in the innermost layer, the strength between the reinforcing fibers and the interlaminar strength between adjacent layers are low, and bubbles are trapped, voids are likely to remain, and voids and cracks are easily generated. In addition, since the strength between the reinforcing fibers is only the resin and the strength is not so high, when the stress in the radial direction is applied, the innermost layer is easily lifted so as to partially bulge.

[0005]

The object of the present invention is to solve the above-mentioned problems in the conventional FRP cylinder used for a roll or the like, and the reinforcing fibers are arranged at an angle of ± 75 to 90 °. An object of the present invention is to provide an FRP cylinder having almost no voids, cracks, or lifts in layers.

[0006]

In order to achieve the above-mentioned object, the present invention provides a method in which a nonwoven fabric is disposed on an innermost layer, and a layer adjacent to the innermost layer has an angle of ± 75 to 90 ° with respect to the cylinder axis direction. Provided is a fiber-reinforced plastic cylinder in which reinforcing fibers are arranged at an angle. In order to ensure the strength and rigidity required in the cylinder axis direction, in the outermost layer, the reinforcing fibers, 0 to ± 30 ° with respect tube axis direction, preferably distribution at an angle of 0 to ± 15 °.

The cylindrical body of the present invention may be subjected to metal plating, for example, a well-known hard chrome plating using nickel and / or copper as a base layer, as it is or on the surface thereof.
After a metal tube such as a thin aluminum tube is covered, a rubber layer is formed, or a resin layer such as a thermoplastic resin or a thermosetting resin is formed, and then the roll can be provided.

[0008] The cylindrical body in the present invention is made of FRP. High-strength, high-modulus fibers such as carbon fibers, glass fibers, and polyaramid fibers can be used as the reinforcing fibers. As the matrix resin, a thermosetting resin such as an epoxy resin, an unsaturated polyester resin, a vinyl ester resin, and a polyimide resin can be used.

[0009] The cylindrical body has reinforcing fibers arranged at an angle of ± 75 to 90 ° with respect to the cylindrical axis direction for mainly supporting the compressive strength in the radial direction. However, since the strength and rigidity in the cylinder axis direction are not sufficient with only the so-called circumferentially wound layer, the reinforcing fibers are usually set at 0 with respect to the cylinder axis direction.
Arranged at an angle of ~ ± 30 °, it provided the combined-called axial winding layer. Of course, there may be other layers. And, as is evident from the dynamics, the axially wound layer should be on the outside. Therefore, the circumferential winding layer is formed on the inner side. However, in this case, the above-mentioned problems of voids, cracks, and floating due to insufficient resin arise. Therefore, in the present invention, a nonwoven fabric that easily holds the resin is disposed inside the circumferentially wound layer, that is, on the innermost layer. As a result, the resin shortage in the circumferential direction winding layer is eliminated, the strength between the reinforcing fibers is improved, and problems such as voids, cracks, and floating can be solved.

[0010] The nonwoven fabric must be able to withstand the temperature during molding. In addition, a fiber made of an organic fiber such as a polyester fiber or a polyamide fiber is preferably used.
This is because these fibers have a large elongation and can effectively prevent cracks between the reinforcing fibers forming the circumferentially wound layer. However, a nonwoven fabric of a reinforcing fiber such as a carbon fiber or a glass fiber may be used depending on the use.

The cylinder of the present invention can be manufactured by various methods known as a method of forming FRP.
Among them, a filament winding method, a prepreg method, a tape wrapping method and the like are preferable.

[0012]

In FIG. 1, a cylindrical body is composed of a layer (innermost layer) 3 using a nonwoven fabric and a reinforcing fiber of 0.degree.
And ~ layers are arranged at an angle of ± 30 ° (outermost layer) 1, located between these layers 3 and the layer 1, distribution in ± 75 to 90 ° angle reinforcing fibers with respect to the cylinder axis Layer 2 having That is, there is a layer adjacent to the innermost layer using the nonwoven fabric, in which the reinforcing fibers are arranged at an angle of ± 75 to 90 ° with respect to the cylinder axis direction. When a roll is manufactured using such a cylindrical body, a shaft body generally called a header is attached to both ends. As described above, a metal plating layer or a rubber layer can be formed on the surface, a metal tube can be covered, or a resin layer can be formed as necessary.

[0013]

EXAMPLE A nonwoven polyester fabric was spirally wound around a metal mandrel having an outer diameter of 200 mm and a length of 4000 mm so that the ends overlapped each other.

Next, the nonwoven fabric on the mandrel was impregnated with a solvent-free epoxy resin, and then preheated from the surface with hot air at 40 to 50 ° C. while rotating the mandrel for defoaming.

Next, carbon fibers containing epoxy resin (carbon fibers: 56% by volume) are moved by ± 85% with respect to the axial direction of the mandrel by a filament winding method.
Wrapped around.

Next, the above-mentioned carbon fiber containing an epoxy resin is wound on the above-mentioned ± 85 ° layer so that its direction becomes ± 10 ° with respect to the axial direction of the mandrel. The process was repeated three times so that the composition ratio of the ± 85 ° layer and the ± 10 ° layer in the final thickness was 1: 7.2.

Thereafter, the polyester tape is wound, heated at 150 ° C. for 420 minutes, and molded, and the above-described operations of winding and molding the carbon fiber are repeated twice.
A cylinder having a thickness of 22 mm was obtained.

Next, the surface of the cylindrical body is cut and polished to obtain an outer diameter of 2 mm.
It was finished into a roll tube having a thickness of 41 mm, a wall thickness of 20.5 mm and a length of 3600 mm.

Next, neoprene rubber was wrapped around the above-mentioned roll base tube, tightened with a cotton tape, and then vulcanized through a temporary shaft. The vulcanization operation uses a vulcanizing pot, 150 ° C,
20 hours. After the operation, the surface was polished to obtain a rubber-coated roll having an outer diameter of 270 mm.

On the other hand, for comparison, a roll tube was prepared in the same manner as above except that the polyester nonwoven fabric was not used, and a rubber-coated roll was obtained.

Observing the cross section of both roll base tubes,
The status of the ゜ layer was examined. No voids or cracks were observed in the case where the nonwoven fabric was used, but 1.6% of the voids existed in the case where the nonwoven fabric was not used. The inner surface of the latter had larger irregularities than that of the former.

Next, the inner surfaces of both rubber-coated rolls were observed. The inner surface of the non-woven fabric was the same as that of the raw tube, but ± 85
゜ The carbon fibers in the layer were partly peeled off and floated. This is presumably because the rubber expanded due to heating during vulcanization, but could not expand due to the restraint by the cotton tape, and a large stress was applied to the ± 85 ° layer.

[0023]

According to the present invention, the cylindrical body has a nonwoven fabric disposed in the innermost layer, and the layer has reinforcing fibers in a layer in which the reinforcing fibers are disposed at an angle of ± 75 to 90 ° with respect to the cylinder axis direction. It supplements the inter-strength. Therefore, as shown in the example,
The layer in which the reinforcing fibers are arranged at an angle of ± 75 to 90 ° with respect to the cylinder axis direction has almost no voids, cracks, or rising of the inner surface.

When a roll is manufactured using the cylindrical body according to the present invention, a roll having excellent mechanical properties such as strength and rigidity can be obtained. Of course, even if the rolls are long and large in diameter, they are lightweight, have low inertia and can perform accurate speed control, and can be easily replaced.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing one embodiment of a cylindrical body according to the present invention.

[Explanation of symbols]

1: a layer that is disposed at an angle of 0 to ± 30 ° reinforcing fiber relative to the cylinder axis (the outermost layer) 2: by disposing at ± 75 to 90 ° angle reinforcing fibers with respect to the cylinder axis Layer (innermost layer) 3: Layer in which nonwoven fabric is arranged (innermost layer)

Claims (5)

(57) [Scope of request for utility model registration] 1. A fiber-reinforced plastic cylinder in which a nonwoven fabric is disposed in an innermost layer, and reinforcing fibers are disposed in a layer adjacent to the innermost layer at an angle of ± 75 to 90 ° with respect to a cylinder axis direction. 2. A non-woven fabric is disposed on the innermost layer, reinforcing fibers are disposed on the layer adjacent to the innermost layer at an angle of ± 75 to 90 ° with respect to the cylinder axis direction, and a reinforcing fiber is disposed on the outermost layer in the cylinder axis direction. ± 0
A fiber-reinforced plastic cylinder in which reinforcing fibers are arranged at an angle of 30 °. 3. The fiber-reinforced plastic cylinder according to claim 1, wherein the nonwoven fabric is a nonwoven fabric of organic fibers. 4. A roll made of a fiber-reinforced plastic having the cylindrical body according to claim 1, 2 or 3. 5. The fiber-reinforced plastic roll according to claim 4, wherein a metal plating layer, a metal layer, a rubber layer or a resin layer is formed on the surface.