| 摘要 |
PROBLEM TO BE SOLVED: To prevent cracks from being generated at the time of the box-making, and improve the preservation property for a content by laminating an inorganic oxide membrane layer of a specified film thickness as a barrier layer of a laminated material in such a manner that the inorganic oxide membrane layer may be located at approx. the center of the thickness of the laminated material, in a paper container which is formed into a box shape by bending a blank sheet comprising the laminated material. SOLUTION: This paper container is formed into a box-shape by bending ruled lines 1 of a blank sheet comprising a laminated material 100, wherein paperboards 120 and 170 are used as base materials, and an inorganic oxide membrane layer 140 is made a barrier layer. In such a paper container, the inorganic oxide membrane layer 140 as the barrier layer of the laminated material 100 is laminated in a manner to be located at approx. the center of the thickness of the laminated material 100. For the inorganic oxide membrane layer 140, at least on one surface of a drawn polyethylene terephthalate film layer from among the laminate constituting materials, a silicon oxide or the like is deposit-formed, and the deposited film thickness is 100 to 3,000Å. Also, the paper container is formed in such a manner that the inorganic oxide membrane layer 140 at a corner section 12 when the laminated material 100 is bent at an approx. right angle on the ruled line, may be bent inward at an obtuse angle. |
