Method of injection molding with pressurized-fluid assist

Details Method of injection molding with pressurized-fluid assist Method of injection molding with pressurized-fluid assist

1989-05-10

1991-12-03

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

2643288, 26432812, 26432813, 425812, B29C 4500, B29D 2200

Patent

active

050698591

ABSTRACT:
A method and system are disclosed for locally introducing fluid, such as a gas, at a predetermined location into molten resin downstream from a resin injection aperture to form a hollow part. The gas is utilized at the localized area to distribute the molten resin, to eliminated molded in stress and to prevent formation of sink marks in the part during resin solidification. An overflow reservoir outside of the mold cavity is filled with the resin during resin injection and then the gas is introduced into the reservoir through a fluid aperture and into the part. The reservoir creates a cocoon of solidified material to act as a seal to prevent gas leakage. One hollow body formed by the method and system includes a substantially endless hollow body portion with a fluid opening for communicating the interior of the hollow body portion with the locally introduced fluid. The hollow body provides an internal gas manifold and means for greater structural integrity.

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
patent: 3021559 (1962-02-01), Strong
patent: 3044118 (1962-07-01), Bernhardt et al.
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), Eckarot
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: 4129635 (1978-12-01), Yasuike et al.
patent: 4136220 (1979-01-01), Olabisi
patent: 4140672 (1979-02-01), Kataoka
patent: 4164523 (1979-08-01), Hanning
patent: 4234642 (1980-11-01), Olabisi
patent: 4247515 (1981-01-01), Olabisi
patent: 4333608 (1982-06-01), Hendry
patent: 4357296 (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

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