| 摘要 |
PROBLEM TO BE SOLVED: To manufacture an inexpensive container utilizing effectively a storage space of a warehouse or the like, satisfying the sealing properties, dropping strength and overlapping strength and reducing the number of processes and weight. SOLUTION: A plurality of annular belts 2 are formed by pressing in a manner of winding the barrel of a square container main body, and the mass production can be realized by pressing without setting and reinforcing materials on the side faces, and the dropping strength and overlapping strength are satisfied and the number of processes and weight are reduced to manufacture an inexpensive container. An opening 17 is formed by bending opening ends to the outside in a manner of winding a core bar 18 provided on the opening, and the strength of the opening 17 is increased sufficiently and the plate thickness of the container is reduced, and the deformation of the opening 17 is eliminated to keep the sealing properties. A sealing material 19 is provided on the back of the cover, and an L-shaped clamping member 20 for claming the opening 17 with the cover 21 is brought into contact with four corners of a square container in the state covering the opening 17, and respective ends of the clamping member 20 are tightened by bolts, and the surface pressure of the sealing material is uniformized to improve the sealing properties and workability.
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