To resolve a technical problem that a finger touch with a cut mark generated at the upper end surface of an opening cylinder part by UPI method is restricted by a shape of the opening cylinder part and provide a container made of synthetic resin under a low cost that can be used safely and peacefully.
An opening cylinder part of a container made by an injection blow molding is formed such that the upper end surface of the opening cylinder part is formed into such a shape that the outer peripheral part is located at a slight lower position stepwise as compared with the inner peripheral part of the upper end surface, a plug is pushed into the container from above a parison held in a blow molding shell mold during a blow molding operation, and a non-required portion above the upper end surface of the opening cylindrical part is cut and removed by a cutting part constituted by the shell mold and the plug at the outer peripheral edge of the inner peripheral part.
WATANABE TOMOHIRO
KISHIGAMI HARUO
| JP2005170409A | 2005-06-30 | |||
| JPH09142532A | 1997-06-03 | |||
| JP2002347731A | 2002-12-04 | |||
| JPS6349371U | 1988-04-04 | |||
| JPH08183561A | 1996-07-16 | |||
| JP2002205719A | 2002-07-23 |
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