Pouch container and method of manufacturing the same

A method of continuously manufacturing a plurality of pouch containers, each of the plurality of pouch containers being provided with a storage space for storing contents and a gas filling space that is a space different from the storage space inside each of the plurality of pouch containers, using a single belt-like film member including more than one portion to be a gusset section of each of the plurality of pouch containers and a plurality of tubular sheet film members, each of the plurality of tubular sheet film members including at least a portion to be a body section of each of the plurality of pouch containers as materials, the method comprising:

• preparing the plurality of tubular sheet film members;
• transporting the single belt-like film member on a transport path along a longitudinal direction of the single belt-like film member;
• supplying each of the plurality of tubular sheet film members to the single belt-like film member being transported on the transport path;
• closing a gusset section-side open end located at one end of each of the plurality of tubular sheet film members in an axis direction supplied to the single belt-like film member with the portion to be the gusset section of the single belt-like film member;
• and
• after the gusset-section-side open end is closed by the portion to be the gusset section of the single belt-like film member, forming the body section and the gusset section by cutting off an excess portion from a joint margin provided at the gusset section-side open end and the portion to be the gusset section of the single belt-like film member, wherein
• in the supplying of each of the plurality of tubular sheet film members to the single belt-like film member, each of the plurality of tubular sheet film members is supplied in a state that the joint margin is expanded and the joint margin is overlapped with the portion to be the gusset section of the single belt-like film member,
• in the closing of the gusset-section-side open end by the portion to be the gusset section of the single belt-like film member, a seal portion is formed by joining an edge portion of the joint margin and an edge portion of the portion to be the gusset section of the single belt-like film member being overlapped,
• in the forming of the body section and the gusset section by cutting off the excess portion, a gas injection portion is provided in which an injection port that communicates with the gas filling space at the edge portion of the body section and the edge portion of the gusset section at a portion where the seal portion is formed by a first tongue-shaped portion formed at an edge portion of one of the body section and the gusset section and projecting outward from the edge portion and a second tongue-shaped portion formed at an edge portion of the other of the body section and the gusset section, overlapping the first tongue-shaped portion by projecting outward from the edge portion, and having a projection length longer than a projection length of the first tongue-shaped portion, and
• when the joint margin is superimposed on the portion to be the gusset section of the single belt-like film member, of the edge portion of the joint margin and the edge portion of the portion to be the gusset section of the single belt-like film member, the edge portion where the second tongue-shaped portion is formed is positioned outside the edge portion where the first tongue-shaped portion is formed, of the edge portion of the joint margin and the edge portion of the portion to be the gusset section of the single belt-like film member, and in the forming of the body section and the gusset section by cutting off the excess portion, by joining both end portions of both the first tongue-shaped portion and the second tongue-shaped portion that overlap each other in a width direction when the seal portion is formed, the injection port is defined by a tip end portion of the first tongue-shaped portion in a projection direction and the second tongue-shaped portion at a portion facing the tip end portion.