Patent ID: 6713009
Filing Date: 2004-03-30
Classification: E06C

Abstract:
A method for rotomoiding a thermoplastic article which comprises placing a quantity of a thermoplastic inside a rotomold, heating said rotomold, and rotating said heated rotomold, the improvement which comprises:a) disposing at least a portion of a metallic core, that includes a heating passage, in said rotomold; b) flowing heated air through said heating passage during at least a portion of time wherein said rotating step is performed; c) bonding a layer of said thermoplastic onto said metallic core during at least a portion of said rotating step; d) said disposing step comprises providing a pair of openings through said rotomold, and clamping said metallic core with respect to said rotomold; and e) said flowing step comprises communicating said heated air through one of said openings and into said heating passage, and communicating said heated air from said heating passage through the other of said openings to air outside said rotomold.