Process for continuously transferring heat to a moving band

Details Process for continuously transferring heat to a moving band Process for continuously transferring heat to a moving band

1975-05-28

1976-12-21

Wong, Jr., Harry

Bleaching and dyeing; fluid treatment and chemical modification

Chemical modification of textiles or fibers or products thereof

Treating textiles or fibers from synthetic resin or natural...

8 94A, 8116R, 81492, 8DIG16, 165 1, D06P 300, D06P 500

Patent

active

039985881

ABSTRACT:
Process for continuously transferring heat to a moving band of solid material, for example, a textile, a film, particles, or any shaped or unshaped article, the band preferably comprising a disperse dyeable synthetic polymer, for example, a polyester or polyamide, said process comprising passing the band through a substantially enclosed purging-drying region containing the superheated condensable vapor of a liquid having an atmospheric pressure boiling point of less than 120.degree. C., thence immediately thereafter through a substantially enclosed, heat-transfer region containing the superheated condensable vapor of a fluorocarbon having a fluorine to carbon atom ratio of at least 1.5, a solubility parameter of not more than 6.5 and a molecular weight of at least about 300, the pressure in the heat transfer region being no greater than that in the purging-drying region, thence immediately thereafter through a substantially enclosed purging region containing dry steam, the pressure in the purging region being no less than that in the heat-transfer region, and thereafter recovering the band of material, said process characterized by efficient heat transfer resulting from rapid convective movement of superheated fluorocarbon in the heat-transfer region and by minimum loss of such vapor to the atmosphere.

REFERENCES:
patent: 3542506 (1970-11-01), Case et al.
patent: 3564723 (1969-01-01), Passey et al.
patent: 3667898 (1972-06-01), Bergman et al.
"Dyeing From Organic Solvents"--Farben Revue, 1971, Special Edition 13, pp. 78-97.
Brekke et al., J. Amer. Oil Chemists' Society, 1959, 3b, pp. 256-260.

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