| 摘要 |
PURPOSE:To present a cleaning effect without fail and to reduce an error by composing an almost whole side surface layer, which directly slides and contacts to a disk, at least, in a cleaning sheet of extremely fine fiber. CONSTITUTION:A cleaning sheet 10 has the thickness of 150-300mum, for example, and obtains three-layer structure. Namely, the cleaning sheet equips a disk side unwoven fabric layer 19 to face with a magnetic disk, a case side unwoven fabric layer 20 to face with a cartridge case and an intermediate unwoven fabric layer 21 to link the unwoven fabric layer 19 and case side unwoven fabric layer 20. The unwoven fabric layers 19 and 20 are composed of the single extremely fine fiber, whose fiber diameter is <=10mum. The intermediate unwoven fabric layer 21 is composed of a fiber layer, whose fiber diameter is 15-30mum, for example. Then, an interval between the unwoven fabric layers 19 and 21 and an interval between the unwoven fabric layer 20 and 21 are unitedly coupled by causing the respective fiber to get entangled each other.
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