Hopper drier

Details Hopper drier Hopper drier

1984-05-07

1986-02-18

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 54, 34169, F26B 1714

Patent

active

045703604

ABSTRACT:
An improved hopper drier for drying granular material of synthetic resin to supply it to a molding machine. The hopper drier includes two dehumidifying columns which are arranged such that dry air dehumidified in one of the dehumidifying columns at a lower temperature is delivered to a heating pipe spirally wound round the heating column disposed adjacent to the hopper drier housing. After air is preheated in the heating pipe, it is mixed with waste air coming from the hopper drier housing and the mixture is then heated in the heating column. While the one dehumidifying column is operated under normal working conditions, the other dehumidifying column is supplied with a part of the dehumidified air flowing from the one dehumidifying column so as to dry dehumidifying material held in the other dehumidifying column. When it is detected that the one dehumidifying column has reduced dehumidifying capability, a shifting operation is carried out immediately so that air dehumidified in the other dehumidifying column is delivered to the heating pipe.

REFERENCES:
patent: 1749763 (1930-03-01), Fleisher
patent: 3621585 (1971-11-01), Robertson
patent: 3737626 (1973-06-01), Davis et al.

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