Process for preparing thermoinsulating and/or structural double-walled molded bodies
AssigneeCentro Sviluppon Settori Impiego S.r.l.
InventorsAntonio Addeo, Annibale Vezzoli
Life of this patent
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Abstract
A process for preparing thermoinsulating and/or structural double-walled molded bodies, which includes the following steps: (a) heating two sheets made of thermoplastic polymer to a temperature equal or slightly higher than their softening point; (b) inserting between the two sheets a pre-mold made of an expanded polymeric material; (c) thermoforming in a mold the two sheets on the pre-mold; (d) soldering together the two sheets on their rims by means of a pressure applied on them by the mold.
Claims7
A process for preparing thermoinsulating and/or structural double-walled molded bodies which comprises the following steps:
- (a) heating two sheets made of thermoplastic polymer to a temperature equal to or slightly higher than their softening point;
- (b) refrigerating a pre-mold made of an expanded polymeric material at a temperature lower than 5.degree. C.;
- (c) inserting between the two sheets the refrigerated pre-mold;
- (d) thermoforming in a mold the two sheets on the refrigerated pre-mold, thus reducing the breakdown of the outer part of the expanded pre-mold when it comes into contact with the heated polymer;
- and
- (e) soldering together the two sheets on their rims by means of pressure applied on them by the mold.
Dependencies are inferred from the claim text.