Abstract
The physical properties of thermal transfer materials arc reviewed. Thermal conductivities and thermal contact resistances were measured for commercial Ink Donor Films (IDF's) with base films of condenser paper or polyethylene terephthalate, and for experimental base materials such as regenerated cellulose, polypropylene, and polyimide. Theoretical models of heat transport in IDF's are presented to demonstrate how the intrinsic thermal properties affect the IDF's performance in thermal transfer printing. To a first order approximation, the sensitivity of an IDF can be characterized by the time taken for heat to diffuse across it. Thermal transfer test patterns for commercial and experimental IDF's were evaluated for sensitivity, and the experimental results were compared to the theoretical predictions.
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