Method for manufacturing sheet material container

A method for manufacturing a sheet material container

• wherein the sheet material container comprises:
• one or a plurality of sheet members including a main-body forming sheet member that has an outer film layer and an inner film layer which are mutually stacked,
• a containing region that accommodates contents, and
• a container body that is configured from the main-body forming sheet member and that surrounds the containing region, and
• the main-body forming sheet member having a main-body sealing portion, which is an attached region between the outer film layer and the inner film layer, and a non-attached region where the outer film layer and the inner film layer are partially not attached, and further having a filling portion where a filler is enclosed between the layers of the outer film layer and the inner film layer in the non-attached region,
• the method comprising:
• introducing gas into the containing region so as to expand the container body;
• injecting the filler between the layers of the outer film layer and the inner film layer in the non-attached region in a state where the container body has been expanded,
• wherein the sheet material container has an inner bag that defines the containing region,
• wherein the inner bag is configured from an inner-bag forming sheet member, which is an innermost-layer sheet member among the one or plurality of sheet members,
• wherein the main-body forming sheet member has an external air intake hole, through which external air is taken in, in a gap between an outer surface of the inner bag and an inner surface of the container body,
• wherein closing the external air intake hole is performed after the expanding of the container body, and
• wherein injecting the filler is performed in a state where the external air intake hole is closed.