Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – With internal application of fluid pressure
Patent
1992-11-12
1993-10-12
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
With internal application of fluid pressure
264 37, 2643288, 26432812, 26432813, B29C 4500, B29D 2200
Patent
active
052522873
ABSTRACT:
A method and apparatus for injection molding of thermoplastic material to form a hollow article in a closed mold in which a molten thermoplastic material is introduced from an injection nozzle into a mold cavity through an opening in the mold, and a pressurized gas is introduced together with the molten thermoplastic material through said opening so that the gas forms a hollow cavity under pressure within the thermoplastic material filling the mold. After the thermoplastic material is solidified to form a hollow article within the closed mold, the gas pressure in the hollow cavity of the article is reduced and the mold is opened. The pressurized gas is introduced into the mold from a gas source and the gas pressure is subsequently reduced by recycling at least a portion of the gas in the hollow cavity to the gas source, thereby avoiding loss of the gas to the surrounding atmosphere.
REFERENCES:
patent: 4101617 (1978-07-01), Friederich
patent: 4824732 (1989-04-01), Hendry et al.
patent: 5066214 (1991-11-01), Baxi et al.
patent: 5078949 (1992-01-01), Strunk et al.
Dynamit Nobel AG
Tentoni Leo B.
LandOfFree
Method of injection molding hollow articles does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of injection molding hollow articles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of injection molding hollow articles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1902484