| 摘要 |
Apparatus for purifying, devolatilizing and/or sheeting a thermoplastic material in which a high density, flowable heat exchange material, having a density substantially above the density of the thermoplastic material and which is essentially immiscible therewith, is continuously circulated through a contact zone in a manner to maintain an extended surface area body of the high density heat exchange material in the contact zone, the thermoplastic material is introduced into and withdrawn from the contact zone in a manner to form a continuously flowing layer of the thermoplastic material across the surface of the body of high density heat exchange material. Thermoplastic material may be introduced into the contact vessel as a powder, melted in an intermediate section of the contact vessel, resolidified at the opposite end of the contact vessel and withdrawn as a sheet of thermoplastic material. Volatilizible impurities or carriers for the thermoplastic material are volatilized while the thermoplastic is being sheeted or a liquid form, solution emulsion or dispersion of the thermoplastic material may be devolatilized and purified. An apparatus is also provided in which a vessel contains the body of high density heat exchange material, the thermoplastic material is introduced above the body of high density heat exchange material or into the body of high density heat exchange material adjacent the bottom thereof and the layer of thermoplastic material is withdrawn.
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