Method of preparing a transparency having a hot melt ink pattern

Details Method of preparing a transparency having a hot melt ink pattern Method of preparing a transparency having a hot melt ink pattern

1991-02-06

1999-11-09

Bell, Janyce

Coating processes

Optical element produced

Transparent base

427256, 427271, 427375, 4273855, B05D 506

Patent

active

059809817

ABSTRACT:
A method for preparing a transparency involves application of hot melt ink to a transparent substrate to form a three-dimensional pattern with subsequent heating of the hot melt image above its melting point to change the configuration of the upper surface. In the embodiment described in the specification, a hot melt ink 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 platen cools the substrate by thermal contact at a rapid rate to prevent crystallization or frosting of the hot melt ink image. 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: 4853706 (1989-08-01), Van Brimer
patent: 5043741 (1991-08-01), Spehrley, Jr.

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