| 摘要 |
PURPOSE:To easily mold a reinforced plastic pipe not excessively increasing the flow velocity of the fluid flowing through the pipe by winding a member having unevenness around a core mold and winding a glass fiber impregnated with a resin around the uneven member to form the reinforced plastic pipe and pulling out the core mold before peeling off the uneven member. CONSTITUTION:At first, a release cellophane tape 2 is wound around a cylindrical metal core mold 1 and a polyester cloth tape 3 having uneven parts 3a is wound around the cellophane tape 2. Next, a glass fiber impregnated with a resin is wound therearound to form an inner layer 4. At this time, an uneven parts 4a are also formed to the inner surface of the inner layer 4. A mortar layer is wound around the inner layer 4 to form an intermediate layer 5 and a glass fiber impregnated with a resin is further wound around the layer 5 to form an outer layer 6. Thereafter, the core mold 1 is pulled out of the formed reinforced plastic pipe and the polyester cloth tape 3 is further peeled off along with the cellophane tape 2. By this method, the reinforced plastic pipe 7 having the uneven part 4a formed by the transfer of the uneven part 3a of the polyester cloth tape 3 formed to the inner surface thereof and reduced in a roughness coefficient is prepared. |
