| 摘要 |
PROBLEM TO BE SOLVED: To permit inspection by a metal detector and heating by a microwave oven and improve disposability after use by laminating a light blocking ink layer to the inner surface of a paper layer, specifying the optical transmittance of a cover material, and laminating an easy-peeling resin layer through an adhesive layer to the light blocking ink layer. SOLUTION: A heat sealable cover material 10 is constructed such that, as a base material of a paper layer 1 supplied with a water retentive, at the side of the outer surface an ink layer 2 such as letters or designs is printed, and a transparent over-printed layer 3 is printed thereon, while at the side of the inner surface of the paper layer 1 a light blocking ink layer is laminated, and an easy peeling resin layer 5 of the innermost layer is laminated thereon through an adhesive layer 5. The optical transmittance of the cover material 10 in the wavelength region of 200-800 nm is 15% or less, and the paper layer 1 is a double face coating paper having a basis weight of 80-110 g/m2. The easy peeling resin layer 6 of the innermost layer is polyethylene, and an uneven pattern is shaped to the cover plate 10, which is in the form of sheet punched to a predetermined shape.
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