| 摘要 |
<p>A process for extruding plastic film or otherwise forming plastic parts is disclosed in which a liquified plastic resin is initially prepared from a starting material of solid resin particles. These resin particles are first partially liquified by conventional means such as in a screw ram extruder equipped with heating devices. A highly viscous fluid output intermixed with some partially melted semi-solid resin particles is forced by the pressure of the extruder through one or more heated conditioners constructed to substantially liquify the remaining partially melted particles. Each of these conditioners is formed of a housing for receiving the partially liquified particles under pressure and a plurality of spaced parallel plates arranged therein in a stack so as to present free space separations between adjacent plates through which the liquid and semi-solid particles are forced. During passage between the plate faces the unmelted solids are flattened and thereby disposed in a geometrical configuration conducive to complete melting of the semi-solids. Following these conditioners the liquid resin is removed of moisture and extraneous gas occluded therein by flowing the liquid over a knife edge disposed in a heated chamber filled with inert gas. Periodically, the chamber is exhausted to remove the impurities dislodged by the internal pressure of the melt into the inert gas upon the emergence of the occluded moisture and gas into the inert gas environment which surrounds the knife edge.</p> |
