Enhancement of Interface Resistance and Knee Voltage in Resistive Ribbon Printing
Original Publication Date: 1985-Dec-01
Included in the Prior Art Database: 2005-Feb-19
In order to increase interface resistance and knee voltage in resistive ribbon printing, a thin polymer layer is deposited between the resistive layer and the metal ground return layer. The presence of this layer will enhance the electrical properties of the ribbon and will lower the current levels required for printing. A simple coating method can be used to coat the thin polymer layer between a resistive layer comprised of conductive polycarbonate and an Al ground return layer. The polymer materials used are: (l) octadecyltriethoxy silane dissolved in alcohol, (2) polydimethyl siloxane (acetoxy terminated) dissolved in kerosene or petroleum ether and (3) polyimide dissolved in n-methyl-2-pyrrolidinone. These materials were coated on the surface of the polycarbonate layer by a roller, then dried in air or in a heated oven.