Method and apparatus for a mechanical dryer for drying thick pol

Details Method and apparatus for a mechanical dryer for drying thick pol Method and apparatus for a mechanical dryer for drying thick pol

1993-06-15

1995-03-07

Bennett, Henry A.

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34496, 34210, F26B 1900

Patent

active

053946227

ABSTRACT:
A dryer with zone temperature controls for drying thick polymer-solvent layers on a substrate. The dryer is formed with several heating elements located in an air duct. The cool air is heated a specific amount as it passes each heating element. The heated air is then applied to the polymer-solvent solution on the substrate in a continuous fashion so that the polymer-solvent solution slowly heats up as it passes through the drying apparatus. The preferred design is to ensure a zone residence time of less than 10 seconds and a web heating rate of 10.degree. F./second or less. Most preferred design is a zone residence time less than 5 seconds and a heating rate less that 5.degree. F./second. The dryer is designed to have a continuous temperature gradient, especially in the critical later stages of drying when the solvent content of the film is less than 20%.

REFERENCES:
patent: 3151950 (1964-10-01), Newman et al.
patent: 4127945 (1978-12-01), Nothen et al.
patent: 4406388 (1983-09-01), Takashi et al.
patent: 4475294 (1984-10-01), Henricks
patent: 4495713 (1985-01-01), Williner
patent: 4786570 (1988-11-01), Yu et al.

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