| 摘要 |
PURPOSE:To make a hollow core material thinner and lightweight, and to alleviate the impact shock when a vehicle collides with something, by injecting air into a hollow core material when a foamable resin raw liquid is foamed in molding a buffer member. CONSTITUTION:The hollow core material 1 having an integrally molded pipe 2 is held in a foaming mold 3, and a raw liquid 4 of a foamable synthetic resin is injected. The pipe 2 is positioned above the mold 3 so that the raw liquid 4 may not enter the core material 1. After the injection, an upper lid 5 is placed. The upper lid 5 is provided with a pierced hole 6 through which the pipe 2 extends, and the upper end of the pipe 2 is connected with an air pipe 7 positioned outside and connected with an air pump 8. When the raw liquid 4 is foamed and cured, the air pump 8 is actuated to inject air. Owing to the injected air, the core material 1 would not be deformed by the foaming pressure, and therefore the core material 1 maintains the shape and is molded integrally with the buffer material 9. |
