Method and plant for dehumidifying material in granular form

Method for dehumidifying plastic material in granular form, comprising the following operating steps:

• a) arranging a dehumidification plant comprising at least one hopper for containing the granular material to be dehumidified, which has a feed mouth and an output mouth, and at least one dry air generator, fluidically connected to means for distributing a flow of dry air inside said hopper;
• b) loading granular material into said hopper through said feed mouth;
• c) measuring the degree of initial humidity of the granular material entering the hopper;
• d) calculating, on the basis of the values of initial humidity of the granular material measured, the dehumidifying capacity of the dry air flow through the hopper needed to achieve predefined humidity values in the granular material leaving the hopper, the residence time of the granular material inside the hopper being fixed;
• e) generating a flow of dry air through said hopper having a dehumidifying capacity calculated in the calculating step d).