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Browse Prior Art Database

Self Correcting Thermal Ink

IP.com Disclosure Number: IPCOM000045658D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Bailey, WD: AUTHOR [+3]

Abstract

A polyamide suitable as a hot-melt adhesive is the single resin material in the marking layer of a self-correcting thermal transfer medium.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 68% of the total text.

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Self Correcting Thermal Ink

A polyamide suitable as a hot-melt adhesive is the single resin material in the marking layer of a self-correcting thermal transfer medium.

In thermal printing using a resistive ribbon, printing is effected by current supplied to the ribbon from small electrodes in a printhead. The ribbon typically has a resistive layer, a thin aluminum layer on the resistive layer, and marking transfer layer. During the printing process, the printhead is in contact with the resistive layer while the transfer layer is in contact with paper being printed upon.

Current is passed through the resistive layer to the aluminum, where it goes to a broad-area grounding element which contacts the ribbon elsewhere in the ribbon path. Heat produced by current through the electrodes softens the transfer layer to effect printing.

Lift-off correction is accomplished by applying a lower current than that used for printing to produce heat which softens the transfer layer to tackiness but not to a point of transfer. The ink on the ribbon bonds to the ink on the paper, and the ribbon is pulled away after a brief period which allows cooling.

In a ribbon as just described, the transfer layer is applied as a dispersion as follows: (1) n-propanol 79.0% by weight; (2) hot melt polyamide (MACROMELT 6202 Trademark of Henkel Adhesives Co.) 18.0% by weight; and (3) carbon black (RAVEN 1255 Trademark of Columbian Chemicals Co., Division of Cities Services) 3.0% by weight. The poly...