Method for producing hollow articles of thermoplastic materials

Details Method for producing hollow articles of thermoplastic materials Method for producing hollow articles of thermoplastic materials

1986-12-22

1989-11-28

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264522, 264550, 4253871, 425130, B29C 4906, B29C 4912, B29C 4922, B29C 4964

Patent

active

048836303

ABSTRACT:
A method of manufacturing hollow articles of thermoplastic materials. Initially, a compact blank, such as a tablet, a palette, a disk or the like, is formed by injection molding into a mold cavity. The blank may be composed of a plurality of layers which surround each other. Subsequently, the blank is compression-molded in the heated state to reduce its thickness and increase its surface area size. Finally, again in the heated state, the compressed blank is formed into a hollow article by a stretching and blow-molding operation. During each injection-molding step, the volume of the mold cavity is adjusted from a minimum volume to a maximum volume at a rate which corresponds to the rate of injection of the respective plastics material. While still in the heated state, at least portions of the injection molded blank are conditioned by additional heat treatments and, subsequently and/or simultaneously, a compressed and condensed mold is formed by a compression molding operation and, finally, a hollow article is formed by a stretching and blow-molding operation.

REFERENCES:
patent: 3586748 (1971-06-01), Ayres
patent: 3825637 (1974-07-01), Robin
patent: 4265852 (1981-05-01), Sauer
patent: 4390487 (1983-06-01), O'Mara
patent: 4419320 (1983-12-01), Perkins et al.
patent: 4717524 (1988-01-01), Aoki

Affiliated with

Also associated with

Rating

Method for producing hollow articles of thermoplastic materials 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 for producing hollow articles of thermoplastic materials, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing hollow articles of thermoplastic materials will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-580763