Most plastic resins absorb humidity from ambient air. Humidity absorbed by resin (hygroscopic material) or found on the surface of pellets (non-hygroscopic material) cause troubles during the production e.g. processing failure, surface defect or loss of mechanical properties. The Modular Resin Dryer RDL uses pre dried compressed air either from the customers' air system, from an integrated compressor system or from the exhaust air of the blowing process of an injection stretch blowmoulding machine (ISBM) for drying. Resin drying FREE OF CHARGE The compressed air used to inflate bottles in an ISBM is of high quality and very low and constant dew point (-68C). This air is then exhausted into the atmosphere without further use. The RDl-R resin dryer uses the exhaust air for material drying. Collecting the dry exhaust air this system assures continuous air flow and cost savings up to 80% compared to conventional desiccant drying systems. Applicable for all resins, including PET