| 摘要 |
PROBLEM TO BE SOLVED: To protect a magnetic disk from flaw by enhancing a degree of freedom of an ultra-fire fiber by providing a liner material mainly comprised of ultra-fine fiber of a specific diameter which is soft and raised. SOLUTION: A linear material is formed of a fiber sheet mainly comprising ultra-fine fiber of diameter of 10μm or less. Fiber diameter of this ultra-fine fiber is preferably 0.01-8μm. The ultra-fine fiber with diameter of 10μm or less is composed, for example, of two or more kinds of resin components and such ultra-fine fiber can be obtained by splitting the splittable fiber which can be split into ultra-fine fiber by the physical and/or chemical processes. Since the single surface of fiber sheet has raised hair and the raised fiber has a higher degree of freedom, the liner material does not damage the magnetic disk and it can remove dust during contact with a magnetic disk because it is raised. Moreover, it is still further preferable to knead an antistatic agent to the fiber constituting the liner material, or adhere the agent to the fiber surface.
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