| http://www.w3.org/ns/prov#value | - Generally, it is difficult to satisfy these properties by a single material, and a single layer film of a high-pressure low-density polyethylene (LDPE) kneaded with carbon black or a pigment as shown in FIG. 21 or a laminated film composed of LDPE and a flexible sheet such as paper, aluminum foil or cellophane, etc. has been employed.
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