| 摘要 |
<p>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 200-300 cp from the latter temperature.</p> |
