Direct Thermal Variable Printing Substrate
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United States of America Patent
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app pub date -
Oct 2, 2014
filing date -
Oct 2, 2014
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Abstract
The invention is an article and method of discretely recording confidential information especially for lottery applications and comprises:
- providing a substrate assembly comprisinga) a substrate,b) a first layer of an acid developer material coated on the substrate,c) a meltable barrier layer applied over the acidic developer material, the meltable barrier layer being meltable in response to the applied heat of a thermal printhead or laser,d) a scratch-off layer coated over the meltable barrier layer, ande) pressure-sensitive microcapsules containing a dye precursor and solvent dispersed in any of the layers and, recording non-visible information by selective application of heat to the substrate assembly using a thermal printhead or laser, the barrier layer being “activated” by melting in discrete areas where heat is selectively applied from the thermal printhead or laser.
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