Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1988-06-20
1990-08-28
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 451, 264255, 264311, B29C 6722
Patent
active
049523503
ABSTRACT:
A method and apparatus for forming a product, and the product, such as a buoy with a plastic outer skin or shell and a plastic foam interior are provided. A first charge including, in one exemplary embodiment, a cross-linkable resin is added to a mold component, followed by a second charge, isolated from the first, and including in the exemplary embodiment expandable polystyrene beads. The apparatus is rotated about two mutually perpendicular axes. Initially, the cross-linkable composition is rotation molded against the walls of the mold to form the outer shell. Thereafter, the second charge of polystyrene beads is released within the mold, at a sufficient temperature to cause expansion of said beads against the shell.
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Kuhns Allan R.
Nelson A. Taylor Co., Inc.
Silbaugh Jan H.
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