Toyo Seikan Kaisha, Ltd.

Kanji Kuroda

Hisashi Katoh

Norifumi Yasuda

Sunao Morishita

Kei Oohori

Kazuo Ando

Kiyotaka Yoshida

A square can capable of securing high sealing performance even if a curvature radius of a seamed portion at a seamed corner portion is reduced, enabling a reduction in a countersink depth, reduced in size, having excellent sealing ability and storage efficiency and a method and an apparatus for double seaming the square can. A second seaming roll () is guided by a model cam for second seaming having a model cam surface for second seaming formed in such a shape that it is swelled from a model cam surface for first seaming outwards at a corner seamed portion (). Accordingly, the seaming shape of the corner seamed portion () is formed in such a shape that the seaming width thereof at the center of the corner seamed portion is larger than the seaming width of a linear sealed portion () and is swelled outwards to absorb an increase in sheet thickness at the corner seamed portion. Also, a seaming wall () is formed in an obliquely inclined seamed shape so that the overlap of a cover hook () with a body hook () of a prescribed amount can be secured without allowing the cover hook () to fall from the body hook () so as to maintain excellent sealing ability.

Growing community of inventors

Yokohama, Japan

Kanji Kuroda