There is described a thermal printer assembly including a plurality of elongated thermal print heads and a frame adapted to fixedly mount and align the plurality of print heads in parallel across a single print media path. The present invention employs a range of ramp source program pulses to iteratively perform a program operation that employs hot hole injection. Preferred models involve an atomic level visual representation of a first polymer adhered to either a second polymer or a substrate at the interface by a force, inclusion of strain-related information, and generating data from modeling effects on the interface of strain cycles resulting from intermittently applied force.