Hot Air Dryers for Plastics Processing  

A hot air drier will do the trick to dry off the surface of non-hygroscopic resins. A hot air dryer is quite easy to use. The HB is controlled by a heater blower unit attached to the drying hopper. A heater/blower machine draws air from the surrounding environment via a filter before warming the air. Adjustable to a maximum of 350 degrees Fahrenheit. The drying hopper is equipped with a heater/blower to move hot air up and through the material within, removing moisture from the material’s surface as it rises and exits the hopper’s top. The heater/control blower’s panel may be wall-mounted or attached to the hopper’s support structure.

These heater blower units are also used in a central drying system. In this case, however, the central dryer sends dry air to the HB and recycles the process air through the central dryer.

No matter what, the hopper of an HB needs a blower of the right size to move enough air through it.

Pellets made of non-hygroscopic materials (such as Polyethylene, Polypropylene, and PVC) may have surface moisture removed using only heated air. Compressed air drying and desiccant drying are unnecessary for these uses.

The basic components of a hot air dryer are a heating element, a fan, a thermostat, and a filter. Most of the time, a drying hopper is used with this method to dry resins that don’t absorb water. When used in conjunction with a desiccant dehumidifying drier, this method may be utilized either to speed up the drying process or to remove any remaining moisture from hygroscopic resins.

HAD’s modular architecture makes it adaptable to different plant layouts and drying arrangements.


Dry the Area Out by Heating the Air Above It

Hot air dryers remove surface moisture from resin pellets in the same way that dehumidifying desiccant dryers do: by constantly passing hot air through the drying hopper. The only real distinction is that hopper air is not recycled in HAD dryers. Exhaust air is filtered via a sock before being released. Comparable to Reynold’s desiccant dryers, the company provides a housing kit that incorporates the heater, blower, intake filter, and control into a single, wheeled, freestanding device. These consolidated units can handle 75 to 250 CFM flows, which translates to throughputs of 150 to 400 lbs/hr.

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