| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive paper container to be manually opened when opening capable of preventing opening of a hole on an inner face layer by discharging expanded air or water vapor generated between a paper layer and an inner face layer by bubbling when heating a heat bonding part of the paper container for liquid to the laminate outside, and keeping sealability.SOLUTION: A paper container for liquid is assembled by using a laminate laminated with a thermoplastic resin layer, a paper layer, an adhesive resin layer, an aluminum foil, and a thermobonding resin layer in this order from an outer face, and heating the inside of a heat bonding part to be joined of an opening end of the cylindrically formed paper container before assembling completion by bonding with the thermobonding resin layer set as an inner face, then by press-joining the heat bonding part. A cutting line is formed in a region from a position near to an outer edge from an inner edge of the heat bonding part to the outer edge of the heat bonding part, from the thermobonding resin layer side. |
