Rotationally molding an insulated plastic molded door with integ

Details Rotationally molding an insulated plastic molded door with integ Rotationally molding an insulated plastic molded door with integ

1996-02-14

1997-12-02

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 466, 264 467, 2642711, 264311, 425812, B29C 4406, B29C 4412

Patent

active

056932715

ABSTRACT:
A high impact resistant rotationally molded door and process for molding the door is disclosed in which a hinge member is integrally molded to the door along one edge only. This hinge member forms to the hollow door edge without door warpage during curing and shrinking of rotationally molded plastic door body. Door warpage is avoided by delaying full integral attachment of the hinge member to the door until curing of the injected foam interior which both bonds to the interior of the door and the hinge member. An improved seal and hinge seal is disclosed together with a placed window construction that can include both placement and shaping to meet the special order needs. Further improvements including the expedient of venting a rotationally molded door during the rotational molding process through an integrally molded hinge edge reinforcing member. This same venting scheme is utilized for enabling improved cooling of the door once molding of the hollow door shell has occurred. Further, the rotationally molded door keys with improved efficiency to subsequently injected foam at the manifold outlets.

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