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The plastics industry processes non-hygroscopic and hygroscopic polymers. 

In non-hygroscopic polymers, the moisture is superficial and therefore eliminated by routine drying. With hygroscopic polymers, on the other hand, the moisture also penetrates into the resin, and so a drying system generating dry air using aluminium silicate, a material capable of trapping water molecules, is required.

Modern drying systems do not stop at drastically lowering residual moisture, instead they regulate the exact content to required levels for polymer processing. The systems are highly reliable - which means operating consistency and repeatable results - and energy efficient.

In developing the new Modula, Piovan has incorporated process control elements in addition to these bonus features (high operating reliability, energy efficiency): consistency in the physical characteristics of the polymer after drying, while the system is adapted automatically to the initial conditions of the polymer and those required by the process.

There are many variables in the drying process including: drying temperature; air dew-point (the quantity of residual moisture); the airflow capacity and the properties of the plastic granule to be processed; ambient temperature; initial moisture; instantaneous quantity of material processed; and residual moisture.  All these parameters have been taken into account in the Modula project, launched by  Piovan in 2010 and now offered in a new range of systems. 

Modula is a multi-hopper, central, fully  automatic drying system. [...]


Click here to read the full article on EPPM website or download the file below.