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:
Feb. 14, 1995
Filed:
Aug. 03, 1993
Shinichi Uehara, Ueda, JP;
Koichi Sato, Ueda, JP;
Nissei ASB Machine Co., Ltd., Nageno, JP;
Abstract
A method of injection molding multi-ply products includes the step of forming an insulating barrier layer from one of different plastic materials used to injection mold multi-ply products, between an injection cavity mold and each of hot-runner nozzles, prior to the injection mold. The insulating barrier layer is formed by pre-charging one of the plastic materials which is the best thermostability into a recess formed in the hot-runner nozzle at its surface contacted by the injection cavity mold, the recess communicating with the exit port of the hot-runner nozzle. The plastic material charged in the recess is cooled and solidified by the injection cavity mold. The insulating barrier layer formed by the solidified plastic material is less thermally deteriorated by heat from a hot-runner mold for a prolonged time period. The heat-insulating property of the insulating barrier layer can be assured during a continuous injection molding process over a week.