Process for thermoremanent duplication of magnetic recording master tape onto slave tape with reduced dimensional changes of slave tape
AssigneeTeijin Limited
InventorTakeo Asai
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Abstract
A process for thermoremanent duplication of a magnetic recording tape, which comprises recording magnetic signals by thermoremanent duplication on a slave tape consisting of a polyester film base and a layer of a ferromagnetic material coated thereon, and then heat-treating said magnetic recording slave tape without stretch at a temperature of at least 40.degree.C. but less than the Curie point of said ferromagnetic material. Dimensional changes of the slave tape after thermal duplication are thereby reduced.
Claims10
A process for thermoremanent duplication of magnetic signals of a magnetic recording master tape on a magnetic recording slave tape consisting of a polyester film base and a layer of a ferromagnetic material coated thereon, which comprises the following steps of
- i. heating said slave tape above the Curie point of said ferromagnetic material,
- ii. contacting said master tape and said slave tape,
- iii. cooling said slave tape below its Curie point while contacted with said master tape,
- iv. separating said master tape and said slave tape, and then
- v. heat-treating said slave tape without stretch at a temperature of at least 40.degree.C. but less than the Curie point of said ferromagnetic material for at least 0.1 second.
Dependencies are inferred from the claim text.