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:
Jan. 16, 1996
Filed:
Mar. 01, 1995
Polyplastics Co., Ltd., Osaka, JP;
Abstract
An injection molding process includes using a mold provided with a resin reservoir having a retractable piston and protruding from a mold cavity in at least one of divided resin passages ranging from the point where the injected molten resin is divided into two streams to a weld formed by the union of the resin streams, feeding the molten resin into the mold while the piston is in a retracted or advanced state to form the weld, and either advancing the piston toward the mold cavity side to force the resin from the resin reservoir into the cavity or retracting the piston to withdraw the resin from the cavity side into the resin reservoir so as to cause the migration of the resin in the weld to thereby force the resin on one side of the weld into the resin on the other side, thus reinforcing the weld, and which is capable of remarkably improving the strength of the weld and its periphery of a molding which otherwise forms a weld having an extremely low strength.