| 摘要 |
PROBLEM TO BE SOLVED: To eliminate curling and loss at cutting and to ensure excellent moistureproofing and lightproofing properties by a method wherein a laminated body which is made up at least with a paper made as a base for its surface while a hot melt layer being made as a heat sealant layer is provided successively with a white film, an adhesion adjustment layer and a hot melt layer at one side of its paper. SOLUTION: A lid material 20 is formed out of a laminated body comprising a paper 1 at the surface serving as a base and a hot melt layer 7 serving as a heat sealant layer with a white plastic film 3 giving lightproofness and an adhesion adjustment layer 5 for reinforcing adhesion for the hot melt layer 7 provided. At this time, a lightproofing/filling layer 2 serving concurrently for lightproofing and filling purposes is arranged between the paper base 1 and the white film 3. A layer made out of a white HDPE including a white pigment and being in the density of 0.050 or more is arranged at the white film 3. Furthermore, the light transmittance at 200-800 nm of the laminated body forming the lid material 20 is set as 10% or below, and a water retaining layer 8 is arranged at the nonlaminated side of the paper 1. |
