Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1995-09-27
1999-10-26
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
156 82, 156196, 1563082, 264 464, 264 80, 264295, B29C 4406, B29C 5336
Patent
active
059722592
ABSTRACT:
A method for forming an angled plastic article of varying density whereby a blowing agent is added to a plastic material and the material is injected into a mold cavity of a mold unit. The interior walls of the mold cavity are maintained at a temperature sufficient to prevent the outer skin of the hardening plastic article from producing gas bubbles. The volume of the mold cavity is increased to allow bubbles to produce and uniformly distribute themselves throughout the mold cavity and then a reconversion phase is instituted whereby the desired density of the finished plastic article is achieved without voids or aberrations appearing in the surface of the plastic article. The mold unit is provided with extensible beveled edges which extend and retract as the mold cavity is enlarged and compressed. By this method, a resulting plastic article of varying density is produced having grooves running the length of the article. After the molding process is complete, an adhesive is applied to the grooves and the molded article is bent whereafter the adhesive maintains the article in the angled orientation. By this method, a complex structure having a smooth outer skin and a lightweight interior may be produced quickly and efficiently.
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Gilchrist Michael C.
Kuhns Allan R.
Laurenzo Brian J.
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