Nippon Steel Composite Co., Ltd.

Other

Nippon Steel Corporation

Kyushu University

Nippon Steel Chemical Co., Ltd.

Nippon Steel Chemical & Material Co., Ltd.

Toshikazu Takeda

Hiromi Kimura

Ichiro Sasada

Shinkichi Murakami

Masaki Shimada

Makiji Miyao

Kenji Kubomura

Masaki Arazoe

Nobuyuki Tsuji

Hironori Maikuma

Hidehiko Hino

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.

Round fiber-reinforced plastic strand, manufacturing method thereof, and fiber-reinforced sheet

It is an object of the present invention to provide a separate type magnetic shield apparatus which has high access performance to a magnetically shielded space, in which magnetic shielding is very effectively achieved. In the separate type magnetic shield apparatus, first and second conductorsandextending in the longitudinal axial line direction are provided on a curved magnetic shield outer side wallof a first magnetic shield side wall bodyA at up and down symmetrical positions relative to the longitudinal plane Hp passing through the longitudinal axial line of the cylindrical space S to cause current to flow therethrough; first and second conductorsandextending in the longitudinal axial line direction, on the curved magnetic shield outer side wallof the second magnetic shield side wall bodyB, at up and down symmetrical positions relative to the horizontal plane Hp passing through the longitudinal axial line of the cylindrical space S to cause current to flow therethrough; and magnetic fluxes H coming horizontally to the first magnetic shield side wall bodyA and to the second magnetic shield side wall bodyB are deflected up and down by means of magnetic fields produced around the first and second conductorsand, thereby preventing magnetic fluxes from flowing into the cylindrical space S.

Separate type magnetic shield apparatus

A continuous reinforcing fiber sheet in which reinforcing fibers are arranged at an arbitrary angle to the main axis. The continuous reinforcing fiber sheet is well applicable to pultrusion forming without the risk of the reinforcing fibers being dispersed. This permits use of the continuous reinforcing fiber sheet in a long fiber-reinforced plastic structural member having remarkably improved torsional rigidity. The continuous reinforcing fiber sheet has a continuous resin-penetrable support sheet and a reinforcing fiber layer held by the resin-penetrable support sheet . Long reinforcing fibers in the reinforcing fiber layer have substantially a certain length (F) and are arranged in the longitudinal direction of the resin-penetrable support sheet at a prescribed angle (&agr;) to the longitudinal direction of the resin-penetrable support sheet

Continuous reinforcing fiber sheet and manufacturing method thereof

A process for producing a bicycle frame of a fiber-reinforced plastics (FRP) including the steps of: forming parts of a bicycle frame such as an upper pipe, a lower pipe, a vertical pipe, a chain stay and a rear fork, or a combination thereof, with an FRP; arranging the bicycle frame parts in a structure of the bicycle frame; forming, with an FRP, lug portions onto the arranged bicycle frame parts at a required position whereat the bicycle frame parts are to be connected and fixed to each other; and curing all of the lug portions at one time, to thereby simultaneously accomplish an assembling of the bicycle frame. A process for forming a lug portion of a FRP bicycle is disclosed which includes the steps of: providing a female mold with a cavity having a shape of a final lug portion; disposing a flexible sheet on a surface of the cavity; arranging frame parts in a structure of a bicycle frame; arranging the female mold at a lug portion of the arranged bicycle frame parts; supplying and foaming a foaming material in the female mold at the lug portion; removing the female mold to leave an assembly of the frame parts with a foamed body; removing the flexible sheet from the female mold; laminating a foaming sheet and then a prepreg of resin-impregnated continuous fibers onto the foamed body; arranging the female mold over the laminated prepreg; and heating to cure the resin while foaming the foaming sheet, to thereby form the lug portion of the FRP bicycle frame.

Process for producing a bicycle frame made of fiber-reinforced plastics

Growing community of inventors

Tokyo, Japan

Toshikazu Takeda