Browse Prior Art Database

Multi-Pass Thermal Transfer Inks

IP.com Disclosure Number: IPCOM000043418D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Anderson, CW: AUTHOR [+4]

Abstract

Thermal ink formulations having an increased proportion of carbon black permit multiple printing. Preferred formulas comprise thermoplastic polyamides with about 20% of total solid weight carbon black. The multiple use provides draft quality, while the same transfer media are used at higher printing temperatures for letter quality. Typical formulations for the ink layer of thermal ribbons release almost completely from the ribbon substrate to the paper. This is true when the substrate contacted is the metallic layer in a resistive ribbon, such as the aluminum layer in the ribbon of U.S. Patent 4,384,797. This is also true when the substrate contacted is an organic polymer, such as polyethylene terephthalate, employed for printing from an internally-heated typehead.

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Multi-Pass Thermal Transfer Inks

Thermal ink formulations having an increased proportion of carbon black permit multiple printing. Preferred formulas comprise thermoplastic polyamides with about 20% of total solid weight carbon black. The multiple use provides draft quality, while the same transfer media are used at higher printing temperatures for letter quality. Typical formulations for the ink layer of thermal ribbons release almost completely from the ribbon substrate to the paper. This is true when the substrate contacted is the metallic layer in a resistive ribbon, such as the aluminum layer in the ribbon of U.S. Patent 4,384,797. This is also true when the substrate contacted is an organic polymer, such as polyethylene terephthalate, employed for printing from an internally-heated typehead. If such ribbons are used in the same areas more than once, voids occur in the images printed. The following formulations provide ink layers for both resistive- ribbon and heated-typehead transfer media which may be reused three to five times. This multiple use provides draft quality printing. These same ribbons provide letter quality, single-use operation at print temperatures in the order of magnitude of fifty percent greater than the printing temperatures for the drafts. In the multi-pass mode, the ribbon may be advanced periodically less than the length of printing or may be advanced by existing feed mechanisms for one-use and rewind a lesser amount as the printer is...