Treatment of hot melt ink images

Details Treatment of hot melt ink images Treatment of hot melt ink images

1991-02-06

1992-05-19

Lawrence, Evan

Coating processes

Optical element produced

Transparent base

427256, 427271, 4273745, 4273982, B05D 300, B05D 302, B05D 506

Patent

active

051147475

ABSTRACT:
In the embodiment described in the specification, a hot melt ink coating such as an image on a substrate is treated in a continuous manner by moving it along a platen having a heating zone to melt drops of hot melt ink and cause them to spread on the substrate. The platen has a flat central portion and curved portions at each end with curvatures sufficient to prevent formation of cockle. At the output end of the heating zone, the substrate is moved continuously into a quenching zone where a cooling platent cools the substrate by thermal contact at a rapid rate of at least 50.degree. C. per second to prevent crystallization or frosting of the hot melt ink image thereby minimizing light transmission losses. After the quenching zone, the substrate is moved along a surface having a reverse curvature with respect to the curved portions of the heating platen to eliminate residual curvature of the substrate resulting from the curved portions of the heating platen.

REFERENCES:
patent: 4751528 (1988-06-01), Spehrley, Jr. et al.
patent: 4801473 (1989-01-01), Creagh et al.
patent: 4853706 (1989-08-01), Van Bromer
patent: 4889761 (1989-12-01), Titterington et al.
patent: 4928112 (1990-05-01), Hock et al.

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