| 摘要 |
PURPOSE:To make a molding cycle shorter by press-molding fiber reinforced thermosetting resin in a mold having been heated, thereafter opening the mold to replace a section of the mold to which the resin is not attached, and closing the mold to inject polyurethane rein containing alkali glass into the mold. CONSTITUTION:As polyurethane resin to be used, well-known thermosetting polyurethane resin which exhibits fluidity at its molding temperature can be employed; however resin of two-part system is desirable. Alkali glass acts as a catalyst which accelerate curing of polyurethane resin and any alkali glass such as glass C can be used regardless of its shape. The amount of the glass for use is usually 1-90wt.%, preferably 2-50wt.%. Press-molding is effected by the use of a combination of a bottom force and a top force so designed that the FRP molded item is attached to the top force when the mold is opened by providing an undercut 1 and by sucking air in the mold through an air pipe 2. Then, the lower section is replaced and the mold is again closed to injected thermosetting polyurethane resin containing alkali glass through a feed port 3 of the lower section into the mold, so that a composite resin molded item is obtained. |
