Waterproofing of Resistive Electrothermal Print Ribbons
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-01
Resistive ribbons are known for use in electrothermal printing, where current flow from an electrode through the ribbon produces localized heat to melt an ink layer. The melted ink is transferred to a carrier, such as paper. The ribbon is sensitive to the environment, and especially temperature and relative humidity. In order to waterproof the ribbon, a plasma polymerized film of octadecyltriethoxysilane is used. A layer 10 of conductive polycarbonate is used as the resistive layer of film, and is placed in a plasma chamber that contains vapors of octadecyltriethoxysilane. This produces a thin silane layer 12 less than 1000 Ao thick. After this, the aluminum layer 14 is deposited, followed by the ink layer 16.