Box-shaped drink package preparing method, involves bending flat rectangular body around bending line above center of rectangular body about angle of specific degrees, so that upper corners are inserted into housing packet

摘要

The method involves bending half side surfaces of respective base parts (7.1) along a bending line (11) from both sides. The bending line is overlapped with respective side edges of front and rear sides about an angle of 180 degrees on one side and not on a base, so that the bent base parts form a housing packet (8) on a flat rectangular body. The flat rectangular body is bent around the bending line above the center of the rectangular body about an angle of 180 degrees, so that upper corners (6.1) are inserted into the packet.