| 摘要 |
PROBLEM TO BE SOLVED: To obtain a preliminary judging method and coating method for suppressing the unevenness of coating thickness of a magnetic layer formed on a base film for a floppy (registered trade mark) disk within a manufacturing standard and for reducing the ratio of defective products. SOLUTION: Since the hardness distribution in the width direction of a base film tends to be similar to the unevenness distribution of coating thickness when the base film is coated with a magnetic paint by a die, the unevenness of thickness of a magnetic layer formed on the base film is estimated by measuring the hardness distribution in the width W direction of the base film in a raw roll state 10. The propriety of magnetic layer formation is judged by comparing the difference of a maximum value and a minimum value among the measured values with a standard value. Thereby, the ratio of the defective products can be reduced by eliminating the base film discriminated as negative.
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