Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1997-04-24
1999-07-20
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
26432819, 264349, 425145, 425205, 425557, 425587, 366 78, 366 91, B29C 4548
Patent
active
059252952
ABSTRACT:
A pre-plasticizing type injection molding machine includes a plasticizing device for plasticizing a molding material supplied from a hopper by a first screw disposed within a first barrel, an injection device 8 for measuring a molten resin supplied from the plasticizing device 5 and for injecting the measured molten resin by a second screw disposed within a second barrel. A switching valve is provided in a resin passage between a resin outlet of the plasticizing device and a resin inlet of the injection device, and an accumulation device is provided for housing a pushing plunger having a stock chamber communicated with the resin passage at a position between the switching valve 10 and the resin outlet of the plasticizing device. The injection molding machine further includes a control portion for driving the first screw for continuous rotation during the molding step, closing the switching valve and shifting the second screw forward during an injection step, and opening the switching valve, driving the second screw for rotation and driving the pushing plunger forward during a measuring step. Thus, by continuous operation of the plasticizing device, the performance of the plasticizing device can be maximized. In conjunction therewith, the degree of mixing and uniformity of a composite resin can be enhanced.
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Rosato et al., Injection Molding Handbook, 2nd edition, International Thomson Publishing, pp. 156 and 157, 1995.
Nakamura Nobuyuki
Yamaoka Kishihiro
Heitbrink Jill L.
Nissei Plastic Industrial Co. Ltd.
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