Drying process

Details Drying process Drying process

1988-03-09

1989-10-10

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 26, 4273722, F26B 302, F26B 1300

Patent

active

048722707

ABSTRACT:
A latex paint containing water and one or more higher boiling organic solvents is coated on a carrier film and dried by a process which yields a dried paint layer free of bubble defects. The film is passed continuously through a series of at least three drying stages in contact with warm, moderately humid air and more than half of the heat required for evaporation is supplied to the underside of the film. Drying conditions in at least each of the first three stages are controlled to maintain a film temperature profile which causes the water to evaporate at a moderate rate but more rapidly than the organic solvents, thus achieving coalescence of the paint and avoiding the trapping of liquids in a surface-hardened paint layer.

REFERENCES:
patent: 2681294 (1954-06-01), Beguin
patent: 3151950 (1964-10-01), Newman et al.
patent: 3231985 (1966-02-01), Smith
patent: 4051278 (1977-09-01), Democh
patent: 4365423 (1982-12-01), Arter et al.
patent: 4719132 (1988-01-01), Porter

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