PLASTICS SHEET THERMOFORMING TOOL WITH POROUS AND NON-POROUS PARTS OF DIFFERENT THERMAL CONDUCTIVITY

摘要

The present invention relates to an improved plug or tool for use in the production of shaped articles from thermoplastic sheet materials. An important feature of the present invention is that the tool or plug comprises a body portion which incorporates one or more inserts which possess a thermal conductivity different from the thermal conductivity of the body portion.