| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve barrierability, to reduce material and product cost to and improve recyclability by using a laminate material comprising a plurality of layers of the same resin material laminated with boundary layers formed between the respective layers. SOLUTION: A laminate material comprising the same resin material including the same grade or different grades laminated by using coextrusion or lamination with boundary faces formed between the respective laminated layers or a laminate material wherein the layers are laminated so that molecular orientations in one layer and the other are right-angled to each other with the boundary face as a border is used to form a packaging container excellent in barrier performance. Alternatively an outer layer for an object to be packaged among two adjacent layers is formed to be thicker and a position of the boundary face between the layers is varied, thereby improving not only barrier performance but also content stability with reduction in adsorption of effective constituents.</p> |
