| 摘要 |
PROBLEM TO BE SOLVED: To provide a hollow body of a synthetic resin in which a crack hardly develops at a junction part, even if a tensile force by an external pressure, letting alone a compression force, acts on it. SOLUTION: A pair of primary semi-hollow bodies (A, B) formed by primary injection molding are united together by the molten resin injected for secondary injection molding to fill a joint space (S) defined about the butt ends (T, T) of the primary semi-hollow bodies (A, B) having their open ends butted against each other. The molten resin for secondary molding fills the space between the butt ends (T, T), or the notch portion, too. Alternatively, the molten resin is compressed after filling the joint space (S) and the space between the butt ends (T, T). COPYRIGHT: (C)2004,JPO&NCIPI |
