Metal container and manufacturing method therefor

Abstract

To obtain a shape for preventing a blocking phenomenon in a stacked state. In a metal container according to the disclosure, an opening portion includes a curled portion or a flange portion that is curved outward. The inner surface of the opening portion includes an inner surface contact portion that comes into contact with an outer surface contact portion provided at the outer surface of a sidewall portion when stacking the metal containers. A holding portion formed by causing a periphery of the sidewall portion to bulge outward is provided between the outer surface contact portion and the inner surface contact portion, and a sidewall portion is provided at the outer surface of the holding portion.

1 . A metal container including an opening portion, a sidewall portion, and a bottom portion, wherein
 the opening portion includes a curled portion or a flange portion that is curved outward,   an inner surface of the opening portion includes an inner surface contact portion that comes into contact with an outer surface contact portion provided at an outer surface of the sidewall portion when stacking the metal container,   a holding portion formed by causing a periphery of the sidewall portion to bulge outward is provided between the outer surface contact portion and the inner surface contact portion, and   an inclined wall is provided at an outer surface of the holding portion.   
     
     
         2 . The metal container according to  claim 1 , wherein
 a holding width is set to 0.3 mm or more, the holding width being a maximum width between a perpendicular line that connects the outer surface contact portion with the inner surface contact portion and the outer surface of the holding portion.   
     
     
         3 . The metal container according to  claim 1 , wherein
 an inclination angle of the inclined wall with respect to the outer surface is in a range from 10° to 50°.   
     
     
         4 . The metal container according to  claim 1 , wherein
 the inclined wall is a tapered surface, and a taper angle of the tapered surface is in a range from 10° to 50°.   
     
     
         5 . The metal container according to  claim 1 , wherein
 the opening portion, the sidewall portion, and the bottom portion are an integrally molded portion made of aluminum, an aluminum alloy, or steel.   
     
     
         6 . The metal container according to  claim 1 , wherein
 an upper side and a lower side of the holding portion are diameter-reduced drawn portions.   
     
     
         7 . The metal container according to  claim 1 , wherein
 an outer diameter of the holding portion is smaller than an outer diameter of the opening portion.   
     
     
         8 . A manufacturing method for a metal container including an opening portion, a sidewall portion, and a bottom portion, the manufacturing method comprising the steps of:
 forming a bottomed cup by performing drawing processing on a sheet metal material;   trimming the bottomed cup;   performing tip diameter reduction drawing on the bottomed cup;   forming the opening portion including a curled portion or a flange portion; and   forming the sidewall portion having a tapered profile by performing diameter reduction drawing at a location closer to the bottom portion than a portion at which the tip diameter reduction drawing is performed.   
     
     
         9 . The manufacturing method for the metal container according to  claim 8 , wherein
 the diameter reduction drawing is performed from the bottom portion side toward the opening portion.   
     
     
         10 . The manufacturing method for the metal container according to  claim 8 , wherein
 tapered portions and vertical portions are alternately formed at the sidewall portion by the diameter reduction drawing.   
     
     
         11 . The manufacturing method for the metal container according to  claim 10 , wherein
 a longest tapered portion having a longest length, among the tapered portions, is formed in a vicinity of a height center of the sidewall portion.   
     
     
         12 . The manufacturing method for the metal container according to  claim 11 , comprising performing printing on the longest tapered portion. 
     
     
         13 . The manufacturing method for the metal container according to  claim 8 , wherein
 a base material of the sheet metal material is aluminum, an aluminum alloy, or steel.   
     
     
         14 . The manufacturing method for the metal container according to  claim 8 , wherein
 the sheet metal material is a resin-coated base material.   
     
     
         15 . The manufacturing method for the metal container according to  claim 14 , comprising locally heating a portion to be processed in the curled portion or the flange portion. 
     
     
         16 . The manufacturing method for the metal container according to  claim 14 , wherein
 cleaning is not performed between or after a series of the steps.