Manufacture of resin platen roll

Abstract

Abstract PURPOSE:To prevent void in a product and sink of the surface thereof by a method wherein a central layer is formed by the first injection molding with a shaft as insert and then, the second injection molding is done using the said molding as insert to form a surface layer. CONSTITUTION:A metal shaft 2 is set into a mold 5 as insert and a central layer 3 comprising a crystalline resin such as polyethylene or polypropyrene is injection molded around the shaft 2. Said molding is set into a die 6 as insert and a surface layer 4 comprising a crystalline resin such as polyethylene or polypropyrene is injection molded around the central layer 3. The use of two injection moldings allow the formation of a relatively thin molding by the first injection molding thereby preventing void in a product and sink of the surface thereof.

Inventors

• 👤 Akihiro Miyaji
• 👤 明弘 宮地
• 👤 Toyoji Ito
• 👤 伊藤　豊司
• 👤 Yoshinori Masuda
• 👤 増田　吉則

Bibliographic Details