Manufacture of multi-layer blown molding

Abstract

Abstract PURPOSE:To obtain readily a multi-layer molding to which a screw, etc. to be secured to another article is firmly fixed and supported, by suspending or reducing the extruding of part of an outer layer resin when the soft outer layer resin and a hard inner layer resin are extruded at the same time. CONSTITUTION:A shielding member 7 is provided in an outer layer passage 5 to block a part of the passage 5, so that the outer layer resin can not flow to the position where a fix screw, etc. of the intended multi-layer blown molding is provided. The hard inner layer resin flows to the said position in stead of the soft resin, so that an enough force is obtained to fix and support the screw, etc. If a shielding member thinner than the thickness of the passage 5 is provided, and the outer layer resin is made thinner, due to the adjacent inner layer resins, the force for fixing and supporting the screw, etc. is similarly enough.

Inventors

• 👤 Yoshihiro Kitayama
• 👤 北山　嘉宏
• 👤 Kuniaki Kajiwara
• 👤 梶原　国昭
• 👤 Mamoru Nakada
• 👤 仲田　護

Bibliographic Details