| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical injection-molded object, which is excellent in packing properties, generates no air bubbles and is extremely useful as a joint or seal member for the automatic ice machine of a refrigerator, and an injection mold which can mold a cylindrical molded object having undercut- shaped pleats stably and continuously without generating molding failure and relying on labor. SOLUTION: The cylindrical injection-molded object, especially the cylindrical injection-molded object made of a thermplastic elastomer has a cylindrical body part, the cylindrical packing part formed to one end part of the body part and the undercut-shaped pleats which are projected into the cylinder of the packing part and formed so as to be inclined toward the cylindrical body part. |
