Drying system for particles

Details Drying system for particles Drying system for particles

1975-12-29

1977-06-21

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 28, 34 60, 432 18, F26B 700

Patent

active

040302059

ABSTRACT:
A system for drying particulate materials such as amorphous polyethylene teraphthalate or other materials that tend to fuse or agglomerate while being heated includes the steps of directing into the lower portion of a dispensing hopper filled with particles of the material a stream of hot dry air at a temperature above the temperature range in which the particles are unstable and tend to cling to one another and allowing the stream of air to pass upwardly through the particles in the hopper and to transfer its heat to the particles and form a temperature gradient in the body of particles in the hopper which is higher than the critical temperature range of the material at the lower portion of the hopper and which causes the particles to pass through the critical temperature range as the particles are dispensed downwardly from the hopper. The particles are agitated in the critical temperature range to prevent the particles from clinging to one another.

REFERENCES:
patent: 1920107 (1933-07-01), Richardson
patent: 2012098 (1935-08-01), Haase et al.
patent: 2427276 (1947-09-01), Hagedon
patent: 2871575 (1959-02-01), Dupont
patent: 3621585 (1971-11-01), Robertson

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