Method of thermally treating plastics material
OwnerRaymond S. Edwardsinventor
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Abstract
A method of thermally treating plastics material includes the steps of heating a treatment chamber at least to the melting point of at least a fraction of the plastic material, maintaining an oxygen level in the treatment chamber below combustion level of liquid or gaseous products from the plastic material, feeding the plastic material into the treatment chamber at a rate ensuring a built-up of a film of liquified plastic material on at least a part of the interior of the surface of the treatment chamber, with the liquified plastic material undergoing a transition into the gaseous phase as a result of the heating of the treatment chamber, and exiting of the gaseous phase out of the treatment chamber caused by vaporization pressure of the gaseous phase within the treatment chamber.
Claims28
A Method of thermally treating plastics material, including the following steps:
- heating a treatment chamber to a temperature in the range between the melting point of at least a fraction of said plastic material and a point not significantly exceeding the point where the liquid phase of the molten material undergoes a transition into a gaseous phase;
- maintaining an oxygen level in said treatment chamber below combustion level of liquid or gaseous products from said plastic material;
- feeding said plastic material into said treatment chamber at a rate ensuring a build-up of a film of liquified plastic material on at least a part of the interior of the surface of said treatment chamber, with said liquified plastic material undergoing a transition into the gaseous phase as a result of the heating of said treatment chamber;
- and
- exiting of the gaseous phase out of said treatment chamber caused by vaporization pressure of the gaseous phase within said treatment chamber.
Dependencies are inferred from the claim text.