Process for preparing fiber reinforced plastics

Claim 1

A process for preparing a fiber reinforced plastic product which comprises: filament winding a strand or rovings on a mandrel in three directions of substantially +60 degrees, -60 degrees and 0 degrees to the axis of the mandrel in desired turns to form braid fabric reinforced in three directions; impregnating a resin before or after the winding step; cutting out the resin pregnated braid fabric from the mandrel to obtain a prepreg reinforced in three directions; and fabricating the prepreg in a desired configuration for a product by heating wherein a traverse is utilized and said winding step further comprises winding a strand at an angle of +60 degrees by shifting said traverse in a first direction from a first end to a second end of said mandrel while rotating said mandrel; winding the strand at an angle of -60 degrees by shifting the traverse in a second direction opposite said first direction from the second end to the first end after passing said traverse over the second end of said mandrel while rotating; stopping rotating of said mandrel; shifting said traverse from the first end; turning said mandrel half a turn and shifting said traverse from the second end to the first end after passing said traverse over the second end; and turning said mandrel half a turn to the original position after passing said traverse over the first end and again winding with an interval from the original position.