METHOD AND APPARATUS FOR THERMOFORMING OF PLASTIC SHEETS

摘要

A method of forming plastics sheets, comprises the steps of supporting a die (or substrate (12)) between plastics sheets (36) in an enclosure, heating the plastics sheets (36) by infra-red heating means (28), evacuating air from the enclosure, and urging the plastics sheets (36) into contact with opposite faces of the die (or substrate (12)) while maintaining a vacuum or a substantial vacuum between the plastics sheets (36). Apparatus for performing this method is also disclosed.