Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – With internal application of fluid pressure
Patent
1990-03-22
1992-05-12
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, 425812, B29C 4500, B29C 4534, B29D 2200
Patent
active
051125633
ABSTRACT:
A process for producing an injection molded product includes introducing a stream of plastic material into a mold space at a first pressure. A quantity of gas is stored in a storage chamber at a second pressure which is at least as high as the first pressure. The gas is introduced into the molten stream of plastic material immediately after the molten material has passed the position at which the gas is introduced thereby forming a gas cavity in the molten material. The gas exerts pressure on the surrounding plastic material to urge the material toward the surfaces of the mold space. As the feeding of the plastic material into the mold space continues, the injection of the gas is also continued. The supply of molten material is terminated when the surfaces of the mold space are completely covered by the molten material. A pressure is held within the gas cavity as the plastic material cools. Subsequently, the pressure is released to bring the mold space to ambient pressure. Then the mold is opened to remove the hollow shaped article. An apparatus for producing an injection molded product is also disclosed.
REFERENCES:
patent: 2940123 (1960-06-01), Beck et al.
patent: 3184524 (1965-05-01), Whiteford
patent: 4106887 (1978-08-01), Yasuike et al.
patent: 4855094 (1989-08-01), Hendry
"The Best of Two Worlds in Plastic Processing", Machine Design, Dec. 9, 1962, Donald R. Dreger, Staff Editor.
Nitrojection Corporation
Tentoni Leo B.
LandOfFree
Process of injection molding with pressurized gas assist does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process of injection molding with pressurized gas assist, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of injection molding with pressurized gas assist will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2425561