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Lubricating Magnetic Tape

IP.com Disclosure Number: IPCOM000073429D
Original Publication Date: 1970-Dec-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Nelson, RG: AUTHOR [+3]

Abstract

Head and tape wear has always been a problem. Mixing lubricant in with the oxide coating is the method used by most tape manufacturers. Previous attempts to lubricate the tape during cure or after cure resulted in the lubricant sitting on the surface of the tape, contaminating the tape drives, and attracting dirt or dust to the surface.

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Lubricating Magnetic Tape

Head and tape wear has always been a problem. Mixing lubricant in with the oxide coating is the method used by most tape manufacturers. Previous attempts to lubricate the tape during cure or after cure resulted in the lubricant sitting on the surface of the tape, contaminating the tape drives, and attracting dirt or dust to the surface.

The method described lubricates the magnetic tape without attacking the binder or altering the tape formulation chemically in any way and also leaves the surface virtually dry. Coefficient of friction tests performed on the tape surface before and after lubricating indicate no difference between treated and untreated surfaces.

Tape from a supply reel comes down and across an idler roller at a constant tension and across a felt wick where a solution containing lubricant is applied to the tape. The solution is composed of 40% Dow Corning DC200, approximately 50 centistokes mixed with 60% FREON* TF, using the FREON TF as a carrying agent. The viscosity of the silicone fluid will vary from 20 to 500 cs. depending on the application, whether it be video tape, computer tape, or audio tape, etc. Trichloroethylene and similar solvents may also be used as the carrying agent.

The tape absorbs the lubricant between the wetting station and a doctor blade or squeegee. The excess lubricant flowing on the surface is stripped from the tape leaving the surface of the tape dry. The tape is then taken over an idler roller a...