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:
Aug. 20, 2002
Filed:
Jun. 16, 2000
The Japan Steelworks, Ltd., Tokyo, JP;
Abstract
A method of plasticizing a material for molding thermoplastic resin foam including the steps of: rotating a screw disposed in a screw cylinder such that rotation and axial movement are permitted to plasticize thermoplastic resin, one of penetrating inactive liquid in a super critical state to molten resin in said screw cylinder and injecting inactive gas having a pressure not lower than the super critical gas pressure into said screw cylinder in a hot state not lower than the super critical temperature to realize a super critical state in said screw cylinder to cause said inactive gas to penetrate said molten resin, and injecting said molten resin for molding a foam member to which said inactive liquid has penetrated into a mold by moving said screw in the axial direction so that thermoplastic resin foam is obtained.