Controlled ink drop spreading in hot melt ink jet printing

Details Controlled ink drop spreading in hot melt ink jet printing Controlled ink drop spreading in hot melt ink jet printing

1988-06-03

1990-08-21

Reinhart, Mark J.

Recorders

Markers and/or driving means therefor

With ink supply to marker

G01D 1415, B41J 201

Patent

active

049510673

ABSTRACT:
In the particulate embodiments described in the specification, a hot melt ink jet system includes a temperature-controlled platen provided with a heater and with a thermoelectric cooler electrically connected to a heat pump, and a temperature control unit for controlling the operation of the heater and the heat pump to maintain a substrate on the platen which receives the ink at a temperature which provides a desired spot size without causing print-through. In certain embodiments, the substrate temperature is from about 20.degree. C. above to about 20.degree. C. below the melting point of the ink and is determined by subtracting half the difference between the jetting temperature and the temperature at which the ink has a viscosity of about 200-300 cp from the latter temperature. The apparatus also includes a second thermoelectric cooler to solidify hot melt ink in a selected zone more rapidly to avoid offset by a pinch roll coming in contact with the surface of the substrate to which hot melt ink has been applied. An airtight enclosure surrounding the platen is connected to a vacuum pump and has slits adjacent to the platen to hold the substrate in thermal contact with the platen.

REFERENCES:
patent: 4741930 (1988-05-01), Howard
patent: 4751528 (1988-06-01), Spehrley et al.

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