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

B - Operations, Transporting

41

J

101/96.0211, 101

B41J 2/01 (2006.01) B41J 2/175 (2006.01)

Patent

CA 1321920

Controlled Ink Drop Spreading in Hot Melt Ink Jet Printing Abstract In the particular embodiments described in the specification, a hot melt ink jet system includes a temperature-controlled platen (16) provided with a heater (25) and with a thermoelectric cooler (28) electrically connected to a heat pump (26), and a temperature control unit (22) for controlling the operation of the heater (25) and the heat pump (26) to maintain a substrate (10) on the platen (16) which receives the ink (15) at a temperature which provides a desired spot size without causing print-through. In certain embodiments, the substrate temperature is from about 20°C above to about 20°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 200-300cp from the latter temperature. The apparatus also includes a second thermoelectric cooler (35) to solidify hot melt ink in a selected zone more rapidly to avoid offset by a pinch roll (12) coming in contact with the surface of the substrate (10) to which hot melt ink (15) has been applied. An airtight enclosure (17) surrounding the platen (16) is connected to a vacuum pump (21) and has slits (18,19) adjacent to the platen to hold the substrate (10) in thermal contact with the platen (16). (Fig. 2)

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