COGATION

Term describing the deposit of dried ink on a thermal resistor in a print head. It was first thought that the impurities in the water caused this but newer studies found that it was, in fact, residual dye left from the continuous heating and cooling of the thermal resistor. These deposits can build and reduce the performance of the thermal resistor. Thermal heads are found on Hewlett Packard and Canon printers, among others.

Located in: Glossary