Carton production method

A carton production method for a carton including

• a box body having an upper surface that is opened,
• a suspension piece extending upward from an upper end of one side surface of the box body,
• a lid body that is provided so as to be rotatable about an upper end of another side surface of the box body and closes the upper surface of the box body,
• an inserting flap provided to the lid body and on an opposite side of the upper end of the another side surface of the box body, so as to be inserted in an inner side of the one side surface of the box body, and
• a suspension hole penetrating the suspension piece,
• the method comprising:
• a first insertion step of rotating the lid body toward the one side surface of the box body to a position where the inserting flap overlaps the suspension hole;
• an application step of applying an adhesive to the inserting flap through the suspension hole;
• a second insertion step of curving the one side surface of the box body so as to protrude away from the inserting flap, inserting the insertion flap, and closing the upper surface of the box body with the lid body;
• and
• an adhesion step of bonding the inserting flap, to which the adhesive is applied, to the inside of the one side surface of the box body.