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Method for Taking the Curl out of Magnetic Tape

IP.com Disclosure Number: IPCOM000095496D
Original Publication Date: 1964-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Bolda, FJ: AUTHOR

Abstract

The processes for applying a metallic coating to a polyester plastic substrate cause stresses in the metal coating. These stresses, in turn, cause a curl in the width dimension of the resulting magnetic tape. Aging of the metal coated polyester plastic magnetic tape in a suitable environment of tension, temperature, time and humidity will produce creep in the polyester plastic and permanently deform the plastic so that it conforms to the metal coated-layer in a manner which relieves or counteracts the stresses in the metal coating. The reduction of the stresses in the magnetic tape, in turn, reduces the magnetic tape's curl.

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Method for Taking the Curl out of Magnetic Tape

The processes for applying a metallic coating to a polyester plastic substrate cause stresses in the metal coating. These stresses, in turn, cause a curl in the width dimension of the resulting magnetic tape. Aging of the metal coated polyester plastic magnetic tape in a suitable environment of tension, temperature, time and humidity will produce creep in the polyester plastic and permanently deform the plastic so that it conforms to the metal coated-layer in a manner which relieves or counteracts the stresses in the metal coating. The reduction of the stresses in the magnetic tape, in turn, reduces the magnetic tape's curl.

Curl is reduced in a magnetic tape of 0. 001 mil in thickness and one inch in width by subjecting the tape to an environment of 150 degrees F and 90% relative humidity for fifteen hours. A tension load of one pound is applied in both the longitudinal and the transverse tape directions during the aging period. The tension is applied in the longitudinal direction by a constant tension winding device and in the transverse direction by skewed rollers positioned at both edges of the tape.

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