| http://www.w3.org/ns/prov#value | - In particular, the range of 0.05 to 0.1 is preferred as the foregoing ratio.When an anionic surfactant is used as lubricant, the coverage thereof is preferably in the range of 0.001 to 0.5 g/m.sup.2, particularly 0.01 to 0.2 g/m.sup.2.It is desirable in the present invention that the protective layer be constituted of two or more layers.
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