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Ribbon Support Film Coating

IP.com Disclosure Number: IPCOM000077259D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Findlay, HT: AUTHOR [+2]

Abstract

Where a polymer matrix transfer media is used in a reversing mode such as a printer ribbon or reversible typewriter ribbon, the transfer of ink from the matrix to the back of the next succeeding layer, when wound on a spool, subsequently causes the ribbon to encounter feeding Problems due to the sticky or tacky nature of the ink that transfers under roll pressure. This ink accumulates in the ribbon guides and other feed mechanism parts and causes feed failure. To overcome the feed failure due to highly increased coefficient of friction in the ribbon guides and thus the need for large feed forces, a backcoating 10 is applied to the reverse surface 12 of the transfer medium 14.

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Ribbon Support Film Coating

Where a polymer matrix transfer media is used in a reversing mode such as a printer ribbon or reversible typewriter ribbon, the transfer of ink from the matrix to the back of the next succeeding layer, when wound on a spool, subsequently causes the ribbon to encounter feeding Problems due to the sticky or tacky nature of the ink that transfers under roll pressure. This ink accumulates in the ribbon guides and other feed mechanism parts and causes feed failure. To overcome the feed failure due to highly increased coefficient of friction in the ribbon guides and thus the need for large feed forces, a backcoating 10 is applied to the reverse surface 12 of the transfer medium 14. A backcoating which has been found to be highly beneficial is comprised of a resin blend of polyester resins, which in turn holds microfine particles of TEFLON*. An additional component of the backcoating is glycerol. The polyester resin blend acts as a binding agent to carry the TEFLON and glycerol. The glycerol being an ink repellent reduces the affinity of the ink for the backing layer of the ribbon, while the microfine TEFLON provides a very low surface energy surface for contact with the ribbon guides and feed mechanisms. A preferred formulation of the ribbon backcoating has been found to be 22.5 parts VITEL** polyester resin PE-200. 12.5 parts of VITEL polyester resin PE-207, 57.5 parts of microfine TEFLON, and 7.5 parts glycerol. This formulation is applied...