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
Patent
1974-05-17
1978-08-01
Hoag, Willard E.
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
264257, 264259, 264271, 264310, B29C 504, B29D 302
Patent
active
041043570
ABSTRACT:
Low speed rotational molding of plastic objects at about ambient temperatures from a liquid thermosetting plastic material distributed in a mold substantially under gravitational force; the selected thermosetting plastic is placed as a distributable liquid in a mold having a volume much larger than the volume of the liquid polymer and slowly rotated about two axes at or about room temperature; urethane polymers to which a quantity of diamine curing agent has been added prior to the introduction of the flowable plastic into the rotatable mold are typical thermosetting materials; useful objects or shapes having thin, relatively uniform walls are produced by the disclosed process; repetition of molding steps allows the build up of same or different layers which may have interposed therebetween, lightening, stiffening, and/or strengthening members; precoating of a mold with a variety of coatings which release, interact, or decorate the thermoset resin surface is also disclosed.
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Hoag Willard E.
Monster Molding, Inc.
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