Lens dyeing method and lens dyeing aparatus: dyeing lenses to gi

Details Lens dyeing method and lens dyeing aparatus: dyeing lenses to gi Lens dyeing method and lens dyeing aparatus: dyeing lenses to gi

1990-07-09

1992-03-17

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Nontextile, dyeing process or product, including inorganic...

8479, 8932, 351165, D06P 520, B05D 118, B05D 506, C02B 522

Patent

active

050964577

ABSTRACT:
A dyeing method for dyeing plastic lenses or the like employed as lenses for eye glasses and exhibiting excellent dyeability. The lens is dipped into a dyeing solution while being moved by a combination of a small-amplitude short-cycle time up and down reciprocating motion superimposed on a large-amplitude long-cycle time up and down reciprocating motion. The lens is minutely oscillated according to the small-amplitude short-cycle time up and down reciprocating motion while being periodically moved up and down in the dyeing solution according to the large-amplitude long-cycle time up and down reciprocating motion. The lowest position of the lens obtained by the large-amplitude long-cycle time up and down reciprocating motion is raised gradually. Also disclosed is a dyeing apparatus which is used to carry out that dyeing method.

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