Process for producing a non-warped longitudinal multi-component

Details Process for producing a non-warped longitudinal multi-component Process for producing a non-warped longitudinal multi-component

1989-12-11

1992-04-14

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 466, 264 467, 264219, 264313, B29C 3910, B29C 6722

Patent

active

051045974

ABSTRACT:
A longitudinal multi-component frame element is formed by positioning at least one longitudinal member to form a first component of the frame element within a longitudinal mold. A second component of the frame element is formed by introducing into the mold a foamable and curable material such as polyurethane which cures to form a rigid plastic component connected to the longitudinal member. Before formation of the rigid plastic component, the longitudinal mold is bent in a direction opposite to a direction of anticipated warping of the frame element that would be caused by internal stresses therein. Thus, the frame element initially is formed within the mold to be of a bent configuration, and after removal of the frame element from the mold, the internal stresses transform such initial bent configuration into a straight or rectilinear configuration.

REFERENCES:
patent: 2010669 (1935-08-01), Hopkin
patent: 3789102 (1974-01-01), Hazelett, Jr.
patent: 3875280 (1975-04-01), Story
patent: 3889353 (1975-06-01), Provi
patent: 4381908 (1983-05-01), Roth
patent: 4460423 (1984-07-01), Bosnia
patent: 4481701 (1984-11-01), Hewitt

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