| 摘要 |
PURPOSE:To increase the molding speed for a reinforced plastic pipe and facilitate the removal of a core cylinder, by molding a reinforced plastic pipe using an endless belt with lugs or ridges on one surface thereof that will be in contact with the core cylinder driven by said endless belt. CONSTITUTION:The core cylinder 6 is made by helically winding, on a mandrel 1, a belt-like paper 3 the rear surface of which is coated with a surfactant and belt-like papers 4, 5 are coated on its rear surface with an emulsion adhesive, etc. such as vinyl acetate emulsion adhesives. The surface of the endless belt 9 that will be in contact with the core cylinder 6 is provided with the lugs 10 or ridges 11. A releasing film 12 of a polyester or the like is wound on the core cylinder 6 that is rotated and is moved along its axis by the endless belt 9, and a reinforcing material 13 of glass roving or the like impregnated with a molding material such as an unsaturated polyester or the like is wound on the releasing film 12 to form a molding material layer 14. Then they are hardened by heating it in a hardening oven 15, the resulting tube is cut by a cutter, and the inner core cylinder 6 is removed to obtain the intended reinforced plastic pipe. |
