To facilitate separation of an outside container from an inside container, and to prevent the paper peeling during separation by joining at least one resin layer with an inner side of the outside container through a joining layer, and setting the strength to initiate the cohesive failure of the whole outside container to be larger than the interface peeling strength between the paper layer and the resin layer.
In a composite container, an outside container 1 mainly consisting of paper is joined with a plastic inside container 2 through an adhesive layer 3. In the outside container 1, a paper layer 1a and a resin layer 1c are joined with the whole surface by a joining layer 1b consisting of the adhesive or the adhesive resin, and the joining force of the joining layer 1b is weaker than the adhesive force of the adhesive layer 3. That means, the relationship to satisfy the inequality of B<A is kept between the range of the strength A to initiate the cohesive failure of the whole outside container 1 and the range of the interface peeling strength B between the joining layer 1b and the resin layer 1c of the outside container 1. The material of the joining layer 1b is the adhesive to adhere the regular paper, and the resin of the resin layer 1c is the polyolefine resin.
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KASHIMA HIROTO
NAKAMURA KEIKO
KAWASAKI HIROSHI
