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Ribbon Conservation Resistive Ribbon Inks

IP.com Disclosure Number: IPCOM000060745D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Evans, JF: AUTHOR [+4]

Abstract

Resistive ribbon thermal transfer printing employs ribbons having a resistive, support layer; a thin aluminum interlayer; and an ink outer layer, which is transferred by heat generated in the ribbon itself. U.S. Patent 4,384,797 is illustrative. Ribbon conservation is achieved by underfeeding the ribbon, with the level of current driven into the printhead and other parameters selected so that the ink layer only partially releases during each moment of printing. A ribbon for such conservation printing is achieved by providing carbon black in polyamide of low melt viscosity, with a minor amount of a hydrate which will break down at the printing temperature. The following is a representative formula by weight for such an ink layer: Polyamide 80%, carbon black 15%, hydrated aluminum 5%.

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Ribbon Conservation Resistive Ribbon Inks

Resistive ribbon thermal transfer printing employs ribbons having a resistive, support layer; a thin aluminum interlayer; and an ink outer layer, which is transferred by heat generated in the ribbon itself. U.S. Patent 4,384,797 is illustrative. Ribbon conservation is achieved by underfeeding the ribbon, with the level of current driven into the printhead and other parameters selected so that the ink layer only partially releases during each moment of printing. A ribbon for such conservation printing is achieved by providing carbon black in polyamide of low melt viscosity, with a minor amount of a hydrate which will break down at the printing temperature. The following is a representative formula by weight for such an ink layer: Polyamide 80%, carbon black 15%, hydrated aluminum 5%. The polyamide is one or a blend of adhesive-grade polyamides predominantly of a dimer acid (of oleic or linoleic acids) moiety and an ethylene diamine moiety. The melt viscosity of the polyamide at 160 degrees Cis less than 20 poise, and typically is less than 15 poise. The components are thoroughly mixed in an isopropyl alcohol toluene solvent blend, with thorough grinding of the carbon black to assure its dispersion. This is coated on the aluminum layer of an aluminized substrate. The solvent is expelled by heat, which is not at a level to disturb the hydration of the aluminum. The ribbon functions well when used in the ribbon conservation m...