Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Temperature control
Patent
1994-07-06
1995-11-28
Heitbrink, Jill L.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Temperature control
425548, 425549, 425564, 264 406, 2643289, 26432815, B29C 4578, B29C 4572, B29C 4523
Patent
active
054702194
ABSTRACT:
A method for runnerless injection molding of a synthetic resin, provided with a novel valve gate for performing intermittent temperature control to forcibly change the property of a molten or solidified resin material adjacent to the gate, capable of performing a precision molding operation without leaving an improper gate mark. The apparatus therefor comprises a runner 3 with a temperature maintaining means for storing a molten resin and forming an injection passage, a gate 1 in communication with a cavity 2 connected to the end of the runner 3, a valve pin 4 enclosed within the runner 3, and an intermittent temperature control assembly P.
REFERENCES:
patent: 4643664 (1987-02-01), Yoshida
patent: 4875848 (1989-10-01), Gellert
patent: 4894197 (1990-01-01), Tsutsumi
patent: 5002480 (1991-03-01), Gellert et al.
patent: 5071340 (1991-12-01), LaBianca
patent: 5106291 (1992-04-01), Gellert
patent: 5135377 (1992-08-01), Gellert
Kato Izumi
Yokoyama Kin-ichi
Heitbrink Jill L.
Lillie Raymond J.
Olstein Elliot M.
Seiki Kabushiki Kaisha
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