| 摘要 |
PURPOSE:To easily peel off between layers of a multiple-layer container to open the container by a method wherein the thickness of a seal part of a flange where a cover material is sealed, the thickness of the boundary part of the innermost layer and the breaking strength of the innermost layer are specified, ad the strength of the boundary part of the innermost layer is lower than the peel strength of the contact face between the innermost layer and the layer contacting the innermost layer. CONSTITUTION:The peel strength between an innermost layer of a plastic multiple-layer container and a layer contacting the inner most layer is less than 2.0 kg/15 mm, and a flange is provided around the brim of an opening of a container main body. Where the thickness of a seal part 7 of the innermost layer on which a cover material is sealed is A mum, the thickness of a boundary part 10 between the side wall of the container main body and the flange is B mum and the breaking strength of the innermost layer is C kg/cm<2>, A>=1.1XB, and B<=(1.33/C)X10<4>. The breaking strength of the boundary part of the innermost layer is lower than the peel strength of the contact face between the innermost layer and a layer which contacts the innermost layer. Breaking of the innermost layer occurs along the boundary part 10 which is Bmum thick and located between the side wall of the container main body and the flange. Thereby, sealing can be easily done with flat sealing and the multiple-layer container easily opened as peeling occurs between the layers. |
