Method of manufacturing a magnetic storage media

Details Method of manufacturing a magnetic storage media Method of manufacturing a magnetic storage media

1986-06-23

1988-05-03

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

427132, 427173, 427289, 427296, H01F 1002

Patent

active

047419229

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.

REFERENCES:
patent: 2898662 (1959-08-01), Robertson
The origin of Stress in Metal Layers Condensed from the Vapour in High Vacuum, H. P. Murbach et al., Proc. Phys. Soc. B, vol. 66, pp. 905-910, 1953.
"Magnetic Recording for Computers," by M. F. Dudson et al., Proc. IEE, IEE Reviews, vol. 119, No. 8R, Aug. 1972, pp. 956-984.

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