| 摘要 |
PURPOSE:To efficiently produce a flexible disk having excellent heat resistance with good production efficiency by subjecting a coated web which is coated with a magnetic layer on a base material to an aging treatment while said web is held wound like a roll. CONSTITUTION:A coating compd. contg. a magnetic material is coated on the base material consisting of a synthetic resin film and is dried. The surface thereof is subjected to a calender treatment to form the coated web which is then taken up like roll under 10-50kg/cm<2> tension to form a web roll. After the web roll is rested for 10-170hr in 40-60 deg.C atmosphere, the web roll is aged for at least 1hr in 65-75 deg.C atmosphere, then the web roll is drawn out and is blanked to a disk shape. The coated web is subjected to two stages of the aging treatment. The web is rested for at least 10hr in 40-60 deg.C atmosphere in the first aging. The coated web having excellent dimensional stability is thus obtd. The heat resistant dimensional stability is improved in the stage of the long-sized roll and therefore, the operation is simple and the yield of production is high.
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