Method for manufacturing a metal container

Abstract

Method for manufacturing a metal container including a metal body part, a metal bottom part and optionally a top part. The method includes steps of: providing a metal body part with a closed circumferential wall; providing a metal bottom part with a flanged edge, the outside of the flanged edge corresponding to the inner side of the body part at the location where the bottom part is to be connected to the body part; placing the bottom part within the body part at the location; and folding the outer end of the body part that extends beyond the flanged edge of the bottom part inward against the inside of the flanged edge of the bottom part. Furthermore, sealer is provided to ensure a liquid- and airtight seal between body part and bottom part, which sealer is included in a coating applied on the bottom part and typically activated by heating.

1 . A method for manufacturing a metal container, the metal container comprising a metal body part with a closed circumferential wall, a metal bottom part and optionally a top part, wherein the method at least comprises the following steps: 
 providing a metal body part with a closed circumferential wall,    providing a metal bottom part with a flanged edge, the outside of the flanged edge corresponding to the inner side of the body part at the location where the bottom part is to be connected to the body part,    placing the bottom part within the body part at said location, and - folding the outer end of the body part that extends beyond the flanged edge of the bottom part inward against the inside of the flanged edge of the bottom part.    
   
   
       2 . The method according to  claim 1 , wherein the outer end of the body part that extends beyond the flanged edge of the bottom part is folded such that the largest part of the inner side of said outer end of the body part butts against the inner surface of the flanged edge of the bottom part.  
   
   
       3 . The method according to  claim 1 , wherein the outer end of the body part that extends beyond the flanged edge of the bottom part is folded inward such that the edge between outer and inner side of said outer end of the body part butts against the inner side of the flanged edge of the bottom part.  
   
   
       4 . The method according to  claim 1 , wherein at least the outer side of the flanged edge of the bottom part is provided with sealing means.  
   
   
       5 . The method according to  claim 1 , wherein the bottom part is made out of a sheet provided at least at one side with a coating, the coating consisting of or comprising sealing means or provided with a coating that is suitable to be used as sealing means.  
   
   
       6 . The method according to  claim 5 , wherein the bottom part is made out of a steel sheet with at least at one side a coating comprising polyethylene terephthalate, polypropylene or a mixture of polypropylene and nylon.  
   
   
       7 . The method according to  claim 4 , wherein the sealing means are activated by means of a heating treatment.  
   
   
       8 . The method according to  claim 7 , wherein the heating treatment consist of induction heating.  
   
   
       9 . The method according to  claim 1 , wherein the bottom part is formed into a dome shape, the dome pointing in a direction opposite to the direction in which the flanged edge of the bottom part points.  
   
   
       10 . The method according to  claim 1 , wherein the container is provided with a top part such as a top part provided with a valve as used for aerosols.  
   
   
       11 . The method according to  claim 1 , wherein the body part of the container is provided with a top opening suitable to receive a valve cap.  
   
   
       12 . The method according to  claim 5 , wherein the sealing means are activated by means of a heating treatment.  
   
   
       13 . The method according to  claim 6 , wherein the sealing means are activated by means of a heating treatment.  
   
   
       14 . A metal container manufactured according to  claim 1  and provided with a top part, wherein the container is manufactured to hold a pressurized medium.  
   
   
       15 . The metal container according to  claim 14 , wherein the top part consists of a valve cap.