Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1974-05-03
1976-02-03
Van Balen, William J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
264 454, 264 455, 264 457, 428321, 428322, 428516, 428520, B32B 326
Patent
active
039365654
ABSTRACT:
A rigid plastic article includes an outer skin surface of a polyolefin plastic material such as cross-linked high density polyethylene tightly secured to a foam core the latter preferably of a high density or medium density polyethylene. Such a laminated plastic article has substantial rigidity and strength, particularly flexural strength, the latter being greater for the laminate than the sum of the individual flexural strengths of the skin and foam separately. Due to the thermal and sound insulation, rigidity, flotation, impact resistance, relative lightweight and weatherability characteristics, the laminate offers particular advantages for use in complex shapes such as automotive doors and tops, camper tops, boats and recreational vehicles and containers such as water tanks, carboys and the like. Such products may be manufactured by a rotational molding procedure in which each of the plastic materials is sequentially introduced into a rotating heated mold. The first plastic material coats the mold surface and the second is sequentially released so that both plastics are fused together in a single cycle with the result that a strong natural bond is formed at the interface of the laminate thus contributing substantially to the overall strength of the resultant product. A third plastic material may be used to form a second surface skin. Typical materials are high, medium, low density polyethylene, cross-linked polyethylene, polycarbonates, and acrylic modified vinyl chloride plastics. The foam core is preferably of high or medium density linear polyethylene having a closed cell structure and a density of 12 to 20 pounds per cubic foot.
REFERENCES:
patent: 3317363 (1967-05-01), Weber
patent: 3419455 (1968-12-01), Roberts
patent: 3455483 (1969-07-01), Inklaar
patent: 3541192 (1970-11-01), Shapero et al.
patent: 3642965 (1972-02-01), Nuttall et al.
patent: 3812225 (1974-05-01), Hosoda et al.
Hollowform, Inc.
Roston Ellsworth R.
Van Balen William J.
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