Apparatus for accurately forming plastic sheet

摘要

A sheet of thermoformable plastic material is positioned by air pressure adjacent a planar surface of a heating plate to heat and at least soften the sheet. The softened sheet is draped over a mold by the force of air pressure to form a molded part upon cooling. Registration pins engaging the sheet maintain the sheet in registration with the mold to insure correct positioning of any indicia on the sheet with corresponding elements of the mold. A plurality of sheets may be fused to one another during heating of the sheets.