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:
Apr. 04, 1995
Filed:
Jun. 03, 1993
Seiki Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of injection molding of polyethylene terephthalate resin which includes a process to heat and melt polyethylene terephthalate resin by means of plasticizing system, and inject the molten polyethylene terephthalate resin under a desirable injection molding pressure from nozzle part 8 through manifold part 9 and runner part 1 into cavity 4, and at the same time of the injection molding, to perform the opening and closing motion of gate 3 part by melting or solidifying the solidified or molten polyethylene terephthalate resin remaining at the gate 3 part by means of the intermittent temperature control apparatus 7 made of a platinum wire provided with along the vicinity of the gate 3, so as to produce the moldings removing the residual sprue at the gate 3 part. By the present invention, the polyethylene terephthalate resin which is very difficult to process by injection molding, is produced as moldings not accompanying a whitening phenomenon but of a high quality with superior transparency.