MANUFACTURE OF SHAPE MADE OF FIBER REINFORCED PLASTICS

• Main Authors: BESSHO HISAMI, SASAJIMA YOICHI, SAKURADA YOSHIHIRO
• Format: Patent
• Language: English
• Published: 01.10.1986
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; PERFORMING OPERATIONS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PURPOSE:To make the thickness of formed product constant, eliminate mixing of bubbles in the corners of the product, increase the fiber content and improve the quality of the shape by winding continuous fibers, impregnated with resin, around a cylindrical mold. CONSTITUTION:The cylindrical core mold 1 is inserted into an elastic pipe 2, formed by an elastic body such as rubber or the like, while a filament layer 3 for forming FRP, whose continuous fibers consisting of glass fibers, carbon fibers or the like are impregnated with resin, is formed around the outer peripheral surface of the elastic pipe 2. Next, the core mold 1 is pulled out of the elastic pipe 2 and a corner mold 6, having an outer profile corresponding to the inner corners of the shape such as a channel, an angle or the like, is inserted into an auxiliary elastic pipe 7, arranged at the outer peripheries of the corners and made of an elastic body such as rubber or the like. Then they are loaded into a forming mold 8. An internal pressure is applied to the elastic pipe 2 through the auxiliary pipe 7 to expand forcibly the elastic pipe 2 in the forming mold 8 together with the filament layer 3 and, thereafter, the resin in the filament layer 3 is heated to cure it. Subsequently, the square pipe, obtained by this method, is divided horizontally into two parts along the lengthwise direction thereof.