Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1993-06-03
1995-04-04
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
26432815, 264DIG46, 425549, 425DIG13, B29C 4503, B29C 4520, B29C 4572
Patent
active
054035368
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.
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Hanyuda Takashi
Kasuga Toshihide
Onuma Susumuhide
Lillie Raymond J.
Olstein Elliot M.
Seiki Kabushiki Kaisha
Squire William
Vargot Mathieu D.
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