Method for manufacturing packaging for pouch container, and device for manufacturing packaging for pouch container

A method for manufacturing a pouch-type packaging material from a first body sheet material and a second body sheet material disposed face-to-face in a first direction, and a top-side sheet material disposed on a top side of the first body sheet material and the second body sheet material in a second direction perpendicular to the first direction, the method comprising:

• a sheet joining process of joining a first main region of the first body sheet material and a second main region of the second body sheet material to provide a pair of side seals spaced apart from each other in a third direction perpendicular to the first direction and the second direction, and joining a first sub-region of the first body sheet material, a second sub-region of the second body sheet material, and the top-side sheet material to provide a top-side seal, the first sub-region being located on the top side of the first main region in the second direction, the second sub-region being located on the top side of the second main region in the second direction;
• a first folding process of making a valley fold along a first boundary line between the first main region and the first sub-region so that the first main region and the first sub-region overlap, while the second main region and the second sub-region do not overlap;
• a first cutting process of cutting the top-side sheet material, the second sub-region, the first main region, and the second main region along a first cutting line that extends from a portion where the top-side sheet material and the second sub-region overlap to a portion closer toward a bottom side in the second direction beyond the first boundary line;
• a second folding process of making a valley fold along a second boundary line between the second main region and the second sub-region so that the second main region and the second sub-region overlap, while the first main region and the first sub-region do not overlap;
• and
• a second cutting process of cutting the top-side sheet material, the first sub-region, the first main region, and the second main region along a second cutting line to form a top-side sheet from the top-side sheet material, the second cutting line extending from a portion where the top-side sheet material and the first sub-region overlap to a portion closer toward the bottom side in the second direction beyond the second boundary line to intersect a first outline that is formed in the first cutting process.