Patent ID: 8367194
Filing Date: 2013-02-05
Classification: B29C,C08J,E04C,Y10T

Abstract:
1. A manufacturing method of a continuous circular-shaped fiber-reinforced plastic strand, for manufacturing a fiber-reinforced plastic strand having a circular-shaped cross-section and a diameter from 0.5 to 3.0 mm, said method comprising: (a) a step of continuously feeding reinforcing fiber bundles each comprising a plurality of reinforcing fibers arranged in a direction while twisting, a number of twists of said reinforcing fiber bundles being from 5 to 40 twists/m; (b) a step of impregnating said continuously fed reinforcing fiber bundles with a matrix resin, the volume ratio of the amount of impregnation of said matrix resin to the amount of said reinforcing fibers being from 30 to 60%; and (c) a step of heating said resin-impregnated reinforcing fiber bundles while straining the bundles at an intensity of from 500 g/piece to 3,000 g/piece and hardening the resin into a circular-shaped cross-section of the reinforcing fiber bundles.