Method of manufacturing a magnetic storage media
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United States of America Patent
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-
May 3, 1988
Grant Date -
N/A
app pub date -
Jun 23, 1986
filing date -
Jul 1, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Transverse bowing of a plastics web coated with a magnetic thin metal film is substantially eliminated by laterally stretching the coated web such that the lateral stress applied to the metal film exceeds the tensile strength of the film and the lateral stress applied to the plastics web lies within the yield point of the plastics material. The coated web is stretched by passage over a curved roll adjusted to provide a lateral strain of at least 1% and typically 1.8% in the web, and such stretching may cause a pattern of interlaced micro-cracks to occur in the metal film. Recording tapes slit from such stretched webs exhibit negligible cupping, and the pressure of micro-cracks has no adverse effect on recording performance or wear.
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