Method of manufacturing can main body, and can main body

Abstract

A method of producing a can body in which, when a barrel section of the can body is held between the outer peripheral surfaces of first and second rotation bodies (20, 21), the barrel section is pressed radially inward by a second projection (21a) from the outer periphery side of the barrel section such that at least a part of the quantity of deformation in the direction of the pressing is elastic deformation, the second projection (21a) is fitted into a first recess (20a) with the barrel section in between and with that portion of the inner periphery side of the barrel section which corresponds to the elastically deformed portion advanced into the first recess (20a), and after that, when the holding of the barrel section by the outer peripheral surfaces of the first and second rotation bodies (20, 21) is released, that portion of the barrel section that corresponds to the first recess (20a) and the second projection (21a) is caused to restore radially outward, thereby the outer peripheral surface of that portion of the barrel section which corresponds to the first projection (20b) is caused to position more outside than that outer peripheral surface of the barrel section which excludes the outer peripheral surface of that portion of the barrel section which corresponds to the first recess (20a) and the second projection (21a).

Description

technical field [0001] The present invention relates to a method for manufacturing a can body in which a cylindrical portion of a bottomed cylindrical can base is embossed to form a can body, a can body, and a can body manufacturing apparatus. [0002] This application is based on Japanese Patent Application No. 2004-310774 filed on October 26, 2004, Japanese Patent Application No. 2004-367905 filed on December 20, 2004, and Japanese Patent Application No. 2005-186463 filed on June 27, 2005. priority, and its content is hereby incorporated. Background technique [0003] As is well known, in so-called cans or bottles filled with soft drinks, etc., in order to arouse consumers' desire to purchase, etc., various patterns are added to the barrel portion, and product identification is given to these cans. As a method of providing such a pattern, for example, a method of applying coating or embossing is conventionally known. [0004] For the latter embossing process, for example...

AI Technical Summary

Problems solved by technology

Therefore, when it is desired to form a plurality of the above-mentioned clear embossed portions, it is necessary to increase the distance between adjacent embossed portions, and there is a problem that it is difficult to perform so-called microfabrication in which a plurality of embossed portions are densely formed.

[0019] Furthermore, the above-mentioned convex portion 101a and the above-mentioned concave portion 102a are generally formed by laser processing, but if the height and depth of these 101a, 102a become larger, the processing accuracy decreases accordingly, so there is a problem that the forming accuracy of the embossed portion decreases.

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