| 摘要 |
<p>METHOD AND APPARATUS FOR THERMOFORMING THERMOPLASTIC FOAM ARTICLES Plastic resin foam articles are thermoformed by (a) preheating the plastic foam, usually supplied in the form of a continuous sheet stock, (b) clamping, in a fixed position, that portion of the stock material which is to be thermoformed,(c) initially deforming the preheated foam stock with a portion of a male mold member to form a preform, (d) drawing a vacuum on the interior of the female mold member to assist in completion of the thermoforming operation, and (e) completing formation of the desired article by deformation of the preform between a male and female thermoforming device.</p> |
