Moulding process and article produced by the process

Details Moulding process and article produced by the process Moulding process and article produced by the process

1997-10-31

2000-09-19

Thibodeau, Paul

Plastic and nonmetallic article shaping or treating: processes

Treatment of material by vibrating, jarring, or agitating...

264255, 2643288, 26432812, 26432816, 264403, 425130, B29C 3110

Patent

active

061207144

ABSTRACT:
A process for forming a molded article having a multilayer structure which comprises successively injecting melts of at least two materials into the cavity portion of a mold, solidifying a part thereof in the cavity portion to form the multilayer structure, characterized in that as a first step, one of the molten materials is injected into the cavity portion and the portion of the injected molten material contacting with the mold surface is solidified to a predetermined thickness to form a skin layer; as the second step, the next molten materials is fed into the cavity, the unsolidified portion of the molten material previously fed is pushed out of the cavity and a part of the thus fed molten material is cooled and solidified from the surface of the mold to form the next layer; and the procedure of the second step is successively repeated using the remainder of the molten materials alternately, and the molded article produced by the above molding process.

REFERENCES:
patent: 4863369 (1989-09-01), Schad et al.
patent: 5008064 (1991-04-01), Sorensen
patent: 5262112 (1993-11-01), Sorenson
patent: 5543092 (1996-08-01), Ibar

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