China portable plastic dehumidifying dryer

Plastic dehumidifying dryer was engineered and designed to effectively remove moisture (in the vapor state) from hygroscopic plastic resins. This process is accomplished by the continuously rotating desiccant wheel and the three air streams (Process, Purge and Regeneration). The Process return air is exposed to an adsorbing media (desiccant wheel) in a sealed air stream, where the desiccant adsorbs the moisture from process air. After the desiccant has adsorbed the moisture, it is exposed to a Regeneration air stream which has been pre-heated to a temperature of about 380°F. (190°C). This causes the moisture to be driven out from the desiccant and prepares it for more moisture adsorption. Now the desiccant media passes through third air stream called purge air stream. Here the desiccant media is cooled down by some of the process air before entering back into the process to provide for better performance. The three air streams (process, regeneration and purge) are separated by special Teflon fabric coated silicon seals. The process air and regeneration air is compressed by using regenerative blowers.

The dry air from the dryer is then heated to the desired drying temperature by an electric heater located in the cabinet. The hot dry air enters the hopper at the bottom and removes moisture vapor from the resin in the hopper. The air from the top of the hopper is returned to the dryer, where it is filtered, passed through the desiccant wheel to remove moisture from the air stream and cooled before the process blower sends the air back through the heater and into the bottom of the hopper again in a continuous process.

Resin Conveying

A regenerative blower pulls resin from a bulk container through a pickup wand and flexible hose to an appropriately-sized vacuum receiver where the material is fed into the drying hopper, as needed. As the material passes through the drying hopper it is metered through a vacuum takeoff valve to a machine mount vacuum receiver mounted on the process machine, thereby maintaining a constant flow of dry material to the feed throat.