Nippon Steel Composite Co., Ltd.

Nippon Steel Chemical & Material Co., Ltd.

Hidehiko Hino

Masaki Shimada

Toshikazu Takeda

Masaki Arazoe

It is an object of the present invention to provide round fiber-reinforced plastic strand, a manufacturing method thereof, and a fiber-reinforced sheet which eliminate limitation in forming speed and limit on number of products capable of being manufactured at a time, do not require use of a release agent, eliminate the necessity of operations such as roughing after forming, and thus permit a considerable reduction of the manufacturing cost and a remarkable increase in the product quality. The manufacturing method of the round fiber-reinforced plastic strand of the present invention comprises (a) a step of continuously feeding reinforcing fiber bundles feach comprising a plurality of reinforcing fibers arranged in a direction while twisting the reinforcing fiber bundles f(b) a step of impregnating the reinforcing fiber bundles ffed continuously with a matrix resin R; and (c) a step of heating the resin-impregnated reinforcing fiber bundles fwhile tensioning to a prescribed intensity, thereby forming the reinforcing fiber bundle into a circular cross-section and hardening the resin, and manufactures a fiber-reinforced plastic strandhaving a circular cross-section.

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Tokyo, Japan

Hidehiko Hino