Continuous gradient dyeing of plastic ribbon

Details Continuous gradient dyeing of plastic ribbon Continuous gradient dyeing of plastic ribbon

1982-09-30

1984-04-17

Clingman, A. Lionel

Coating apparatus

Immersion or work-confined pool type

Work extending through pool-confining wall area

8506, 8478, 68175, 118 45, 118 67, 118 68, 118419, 118694, 118712, B05C 302

Patent

active

044427883

ABSTRACT:
There is described a process for producing, in a continuous manner, a gradient dyeing across the width of a long strip of a plastic sheet and an apparatus used therefor. In a preferred embodiment of the invention, the orientation of the plastic strip is maintained substantially constant during the passage through a dye bath, and the dye liquid level is repetitively varied by use of a liquid level control means. This invention is particularly useful for making gradient-dyed plastic sheets which in turn are used for making sunglass lenses.

REFERENCES:
patent: 2522071 (1950-09-01), Tait
patent: 2588973 (1952-03-01), Fitch
patent: 3385745 (1968-05-01), Mears
patent: 3964434 (1976-06-01), Adler et al.
patent: 4084541 (1978-04-01), Ito
patent: 4190418 (1980-02-01), Buzzell
patent: 4258653 (1981-03-01), Buzzell
patent: 4259379 (1981-03-01), Britton et al.
patent: 4327130 (1982-04-01), Pipkin

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