Method of manufacturing contents-filled packaging container

A method of manufacturing a contents-filled packaging container, in which a packaging container is filled with contents,

• the packaging container, includes:
• a packaging container-filler member;
• and
• a bag body provided with an opening facing a predetermined side and accommodating the packaging container-filler member,
• the packaging container-filler member, includes:
• a front-side sheet and a back-side sheet disposed to oppose each other;
• a first connecting sheet connecting outer edges of the front-side sheet and the back-side sheet on a first side in a first direction along the front-side sheet;
• a second connecting sheet connecting outer edges of the front-side sheet and the back-side sheet on a second side in the first direction;
• and
• a third connecting sheet connecting outer edges of the front-side sheet and the back-side sheet on a first side in a second direction along the front-side sheet, the second direction crossing the first direction,
• the front-side sheet, the back-side sheet, the first connecting sheet, and the second connecting sheet constitute a cylindrical body whose cross section is rectangular when the cylindrical body has a three-dimensional shape,
• the first connecting sheet, the second connecting sheet, and the third connecting sheet are each folded in an opposing direction in which the front-side sheet and the back-side sheet oppose each other, and
• the packaging container-filler member is disposed such that a second side thereof in the second direction is the same as the predetermined side,
• the method, comprising:
• opening peripheral edge portions facing each other of the opening of the bag body;
• deforming the first connecting sheet, the second connecting sheet, and the third connecting sheet so as to extend in the opposing direction inside the bag body;
• filling the contents between the front-side sheet and the back-side sheet of the packaging container-filler member through the opening of the bag body:
• closing the opening of the bag body;
• after deforming the first connecting sheet, the second connecting sheet, and the third connecting sheet, and before filling the contents, bending a side flap extending outward from a first surface of the bag body by a pressing force from an outside to adhere the side flap to the first surface, the first surface of the bag body corresponding to the first connecting sheet or the second connecting sheet, wherein
• when adhering the side flap to the first surface, the third connecting sheet deformed and extending in the opposing direction supports the first surface of the bag body.