| 摘要 |
PROBLEM TO BE SOLVED: To widen the range of ultrasonic sealing conditions through eliminating the possibilities that the paper layer might be scorched and the adhesive properties of the sealant layer might be deteriorated by forming the sealant layer using the paper layer as a base material and setting the density of the paper layer above a specific value. SOLUTION: A paperboard 12 with 0.92 g/cm3 or more density as a paper layer is used as a base material an an ehtylene-mathacrylic acid copolymer 13 is laminated on one face side of the base material as an adhesive in order to provide barrier function to light, oxygen or moisture. Further a polyethylene terephthalate film 15 with a laminated aluminum foil 14 is applied to the copolymer 13 face. In addition, a sealant layer 16 is laminated on the film 15 and polyethylene 11 which becomes the outside of the container is laminated on the other face side of the base material. Thus it is possible to prevent the paper layer from becoming scorched and the adhesive properties of the sealant layer from being deteriorated and further widen the range of sealing process conditions during ultrasonic sealing procedures.
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