Title:
ボトル缶の製造方法
Document Type and Number:
Japanese Patent JP7060349
Kind Code:
B2
Abstract:
To finish an outer surface from a shoulder part to a diameter-reduced part in an outer shape in which a curved surface has a continuous smooth round shape.SOLUTION: A bottle can includes: a shoulder part which has a curved convex surface having an outward convex shape by reducing a diameter of an upper end of a cylindrical body part toward an inner side in a radial direction by pressing an annular molding surface of a mold to an opening end of a cylindrical cylinder body and relatively moving in a can axis direction; an inflection part which has a curved concave surface having a concave shape when viewed from an outer side by reducing a diameter of an upper end of the shoulder part; and a diameter-reduced part of which a diameter is gradually reduced as closer to the opening end above the inflection part. In a manufacturing method of the bottle can, processing from the shoulder part to the inflection part is carried out by dividing into a preforming process and a reforming process, and a diameter-reduced part forming process for forming a diameter-reduced part is between the preforming process and the reforming process.SELECTED DRAWING: Figure 3
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Inventors:
Yoshino Masuhiro
Atsushi Yamashita
Atsushi Yamashita
Application Number:
JP2017183430A
Publication Date:
April 26, 2022
Filing Date:
September 25, 2017
Export Citation:
Assignee:
Universal Can Corporation
International Classes:
B21D51/26; B65D1/00; B65D1/02
Domestic Patent References:
| JP2002292434A | ||||
| JP2013227083A | ||||
| JP2017526591A |
Attorney, Agent or Firm:
Masakazu Aoyama