Apparatus and method of drying and dehumidifying plastic

Details Apparatus and method of drying and dehumidifying plastic Apparatus and method of drying and dehumidifying plastic

1989-10-30

1990-12-04

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 44, 34 62, 34 72, 34 80, F26B 1900

Patent

active

049743376

ABSTRACT:
An apparatus and process for heating and dehumidifying plastic materials in a container, such as a hopper, using a current of warm dry air. The apparatus having a desiccant for removing the moisture picked up from the material, and having a heater and cooler downstream from the desiccant. The dryer control operates in three modes to control the cooler only, to control the heater and cooler, and to control the heater only. Measured temperatures and operating conditions control the selection of specific modes.

REFERENCES:
patent: 3163888 (1965-01-01), Shattuck
patent: 3194868 (1965-07-01), Shaw
patent: 3259175 (1966-07-01), Kraus et al.
patent: 3766660 (1973-10-01), Settlemyer
patent: 3950118 (1976-04-01), Adair
patent: 4508670 (1985-04-01), Janke
patent: 4541792 (1985-09-01), Zakic
patent: 4621678 (1986-11-01), Hahn et al.
patent: 4870760 (1989-10-01), Graff
Conair/Franklin Brochure entitled "Dehumidifying Dryers and Preheaters" (Form FDB-3 SEN 5/88).

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