| CPC B29B 13/065 (2013.01) [B29B 9/16 (2013.01); B29C 48/287 (2019.02); B29C 48/288 (2019.02); B29C 48/397 (2019.02); B29C 48/793 (2019.02); B29C 48/92 (2019.02); B29B 2009/168 (2013.01); B29C 2035/0283 (2013.01); B29C 2948/92038 (2019.02); B29C 2948/92047 (2019.02); B29C 2948/92838 (2019.02)] | 10 Claims |
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1. A process for treating polymer granular material (2), the process comprising:
providing the polymer granular material in a drying hopper (10),
introducing into the drying hopper a drying gas having a predefined flow rate and temperature so as to heat the polymer granular material up to a discharge temperature and to dry the polymer granular material up to a predefined residual humidity value,
discharging, from the hopper, a portion of the polymer granular material which is heated to the discharge temperature into a transformation unit (100) for the polymer material, which transformation unit comprises an extruder (101) inside which the polymer granular material discharged from the hopper is brought to a molten or semi-molten state and transported along the extruder by a rotating screw (104) in order to be injected into a mold (102) or caused to pass through an extrusion head,
measuring a control parameter which is correlated with the rotation of the screw inside the extruder, wherein the control parameter is the power consumed by a motor rotating the screw, and
regulating the flow rate of the drying gas on the basis of said measured control parameter.
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