Process for drying granular polymeric material and plant operating according to said process
AssigneePegaso Industries S.P.A.
InventorRinaldo PIVA
Life of this patent
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Abstract
A process for drying granular polymeric material, comprising the steps of: dehumidifying the granular polymeric material by means of a first flow of gas at a first temperature of between 100° C. and 150° C.; heating the dehumidified granular polymeric material to a second temperature, greater than the first temperature; drying the granular polymeric material heated to the second temperature, by applying a predefined vacuum level; and transferring the dried granular polymeric material to a feed hopper (40) provided upstream of a working machine (100).
Claims16
A process for drying granular polymeric material, comprising:
- dehumidifying said granular polymeric material by a first flow of gas introduced into said granular polymeric material at a first temperature of between 100° C. and 150° C.;
- heating said dehumidified granular polymeric material to a second temperature that is greater than said first temperature;
- drying said granular polymeric material heated to said second temperature by applying a predefined vacuum level;
- and
- transferring said dried granular polymeric material to a feed hopper (40) that is provided upstream of a machine (100) for working said granular polymeric material.
A plant for drying granular polymeric material, comprising:
- at least one dehumidification hopper (10), which is connected to a dehumidification line (11), through which a first flow of gas for dehumidifying said granular polymeric material is introduced into said dehumidification hopper;
- at least one heating hopper (20), which is arranged downstream of said dehumidification hopper and is provided with a heating unit (21), for heating said granular polymeric material to a second temperature that is higher than the temperature of said first flow of gas;
- at least one drying hopper (30), which is provided downstream of said heating hopper and is connected to a depressurization circuit (31), for obtaining a specified vacuum level in said drying hopper and for drying said granular polymeric material;
- and
- at least one feed hopper (40), which is provided downstream of said drying hopper and upstream of a machine (100) for working said granular polymeric material.
The drying plant according to further comprising a heating unit provided in said feed hopper (40).
Dependencies are inferred from the claim text.