Browse Prior Art Database

Manufacture of Magnetic Tape

IP.com Disclosure Number: IPCOM000095346D
Original Publication Date: 1965-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Friedman, H: AUTHOR

Abstract

The cross-section of magnetic tape shows a flexible dielectric substrate 2. There is a first layer 4 containing conducting material such as carbon black in a suitable polymeric binder. Also there is a second layer 6 containing magnetically susceptible material such as gamma iron oxide dispersed in a suitable polymeric binder.

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Manufacture of Magnetic Tape

The cross-section of magnetic tape shows a flexible dielectric substrate 2. There is a first layer 4 containing conducting material such as carbon black in a suitable polymeric binder. Also there is a second layer 6 containing magnetically susceptible material such as gamma iron oxide dispersed in a suitable polymeric binder.

Normally in the manufacture of magnetic recording media, magnetically susceptible material and conducting material are dispersed in a binder and applied in a single substantially homogeneous coat. The purpose of the conducting material is to reduce the resistance of the tape. It also, however, greatly reduces the volume of signal output produced by the magnetically susceptible material. Such tapes are in effect a compromise between minimum resistance and maximum signal output due to the physical interaction of the components.

This magnetic recording media allows resistance and signal output to be varied at will. Each can be varied independently of the other without the disadvantageous interactions occurring in one-coat recording media.

The recording media is prepared by dispersing the magnetically susceptible material and the conductive material in separate binder aliquots. The dispersion containing the conductive material is then applied to substrate 2 by coating. Layer 4 is air-dried or forced-dried or kept semidry. Directly on top is applied layer 6 containing the magnetically susceptible material. By proper s...