| 摘要 |
PURPOSE:To always keep the clean surface of a magnetic disk sheet by using an unwoven fabric having contact with the disk sheet and a chemical dust suction layer formed on the inner side wall of a case to form a liner. CONSTITUTION:The liners 15 and 16 of approximately circular forms, for example, are fixed to the inner side walls 11a and 11b a case 11 which are opposite to a magnetic disk sheet 12. The liner 15 has a double layer structure of an unwoven fabric 15a having contact with the sheet 12 and a chemical dust suction layer 15b fixed to an inner wall 11a of the case 11. The liner 16 set at the opposite side also has a double layer structure of an unwoven fabric 16a and a chemical dust suction layer 16b. The fabrics 15a and 16a use a volatile oil material like 'Teflon(R)', etc. which is comparatively coarse and thin and easily melt-stuck by heat. While the layers 15b and 16b are obtained by impregnating an emulsion made by mixing a surfactant like a nonionic group, mineral oil and water and then emulsifying them into the cloth.
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