| 摘要 |
A method for making a flexible hollow molded body that is open on several sides, such as pipe manifolds, and particularly double-tee headers, T-headers, and Y-headers out of an elastic or a soft thermoplastic material, and a device therefor comprising a brittle one-piece molding core containing at least one predetermined breaking point which is so disposed that after breaking, the molding core may be withdrawn completely from the hollow molded body providing a passage therethrough that is always free and open even when the hollow molded body is bent or comprises geometric shapes that intersect one another. The material of the hollow molded body may be built up around the molded core by various methods, for example by molding or injection in a matrix, by immersion or by centrifugal immersion. |
