Multi-layer rotational plastic molding

Details Multi-layer rotational plastic molding Multi-layer rotational plastic molding

2006-01-03

2006-01-03

Staicovici, Stefan (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

C264S310000, C264S311000, C425S144000, C425S270000, C425S435000

Reexamination Certificate

active

06982057

ABSTRACT:
A multi-layer rotational-molded plastic article has an area, such as a sight line for viewing content levels, where an inside layer protrudes through the outside layer and may be bonded to it. A first flowable material such as plastic resin is introduced into a mold having an insulating member extending through an aperture or slot into the mold. The mold is rotated and heated to less than full cure. The insulating member is removed, a second, transparent flowable material is introduced into the mold, and a cover member replaces the insulating member. The mold is rotated and heated to cure both resins, and only then cooled and opened.

REFERENCES:
patent: 4043721 (1977-08-01), Lemelson
patent: 4106745 (1978-08-01), Carrow
patent: 4548779 (1985-10-01), Steinberg et al.
patent: 5529481 (1996-06-01), Guzikowski
patent: 6383437 (2002-05-01), Grieve
patent: 1150018 (1969-04-01), None
patent: 2 341 340 (2000-03-01), None

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