The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 18, 2006
Filed:
Dec. 26, 2001
Hiroshi Yamaki, Kawasaki, JP;
Yuji Tanaka, Yokosuka, JP;
Hiroshi Yamaki, Kawasaki, JP;
Yuji Tanaka, Yokosuka, JP;
Asahi Kasei Kabushiki Kaisha, Osaka, JP;
Abstract
Disclosed is a method for foam-injection molding a thermoplastic resin, comprising: (1) providing a mold comprising a fixed mold half and a movable mold half mating with the fixed mold half to thereby form a mold cavity defined by an inner wall of the fixed mold half and an inner wall of the movable mold half, wherein the mold cavity has an inner wall which has a molten resin releasing means, (2) injecting a foamable thermoplastic resin in a molten form into the mold cavity of the mold, thereby forming a foamable molten resin mass in the mold cavity, (3) applying a pressure to the foamable molten resin mass in the mold cavity to press the surface of the foamable molten resin mass against the inner wall of the mold cavity, thereby allowing a surface portion of the foamable molten resin mass to be solidified to form a surface skin layer of the foamable molten resin mass, and (4) releasing a portion of the foamable molten resin mass under the foaming pressure exerted by the foamable molten resin mass to the outside of the mold cavity through the molten resin releasing means, thereby lowering the pressure exerted on the foamable molten resin mass, so that foaming of the foamable molten resin mass in the mold cavity is caused to occur to form a foamed resin mass having the surface skin layer remaining substantially non-foamed.