Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – With internal application of fluid pressure
Patent
1988-08-25
1990-07-24
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
With internal application of fluid pressure
2642978, 2643288, 26432813, 425546, 425560, 425562, 425568, 425572, 425588, 425812, B29C 4500, B29C 4534, B29D 2200
Patent
active
049434071
ABSTRACT:
A method, system and device utilized therein for the injection molding of plastic articles of enhanced surface quality using pressurized fluid. The fluid is prevented from contaminating the molten resin in the nozzle from which it was injected to thereby eliminate splay. The method involves the initial step of injecting molten resin at a nominal injection pressure from the nozzle of an injection molding machine through a resin injection aperture at an upstream position in a mold. The resin travels along a resin flow path in the mold to a mold cavity defining the shape of the molded article at a downstream position. The device at least partially defines the resin flow path in the mold. A charge of fluid pressurized at a predetermined level is communicated to the resin flow path through an orifice in the device which opens to the resin flow path. During or after resin injection the pressurized charge of fluid enters the flow path at the orifice and passes into the mold cavity to distribute the molten plastic within the mold cavity. The fluid is contained within the mold cavity under pressure until the article has set up, and is thereafter vented to the atmosphere. The device prevents the pressurized fluid from traveling back along the resin flow path and through the injection aperture. The device thereby prevents contamination of the molten resin in the nozzle.
REFERENCES:
patent: 2331688 (1943-10-01), Hobson
patent: 2345144 (1944-03-01), Opavsky
patent: 2714747 (1955-08-01), Lindemann et al.
patent: 2714748 (1955-08-01), Stirnemann et al.
patent: 3021559 (1962-07-01), Strong
patent: 3135640 (1964-06-01), Kepka et al.
patent: 3687582 (1972-08-01), Hendry et al.
patent: 3966372 (1976-06-01), Yasuike et al.
patent: 4033710 (1977-07-01), Hanning
patent: 4078875 (1978-03-01), Eckardt
patent: 4082226 (1978-04-01), Appleman et al.
patent: 4092389 (1978-05-01), Sakurai
patent: 4101617 (1978-07-01), Friederich
patent: 4106887 (1978-08-01), Yasuike et al.
patent: 4129636 (1978-12-01), Yasuike et al.
patent: 4136320 (1979-01-01), Olabisi
patent: 4140672 (1979-02-01), Kataoka
patent: 4234642 (1980-11-01), Olabisi
patent: 4247616 (1981-01-01), Olabisi
patent: 4333608 (1982-06-01), Hendry
patent: 4367296 (1982-11-01), Hafele
patent: 4474717 (1984-10-01), Hendry
patent: 4555225 (1985-11-01), Hendry
patent: 4601870 (1986-07-01), Sasaki
patent: 4604044 (1986-08-01), Hafele
patent: 4740150 (1988-04-01), Sayer
Ladney Michael
Tentoni Leo B.
Thurlow Jeffery
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