Can with fold lines, method and device for production thereof

Abstract

A can, and device and method for producing same, includes two circular end elements forming a base and lid. The can further includes a sleeve which has fold lines forming edges, the can sleeve having a circular cross-sectional area at both ends and a polygonal-sectional area in its central region. The polygonal cross-sectional area in the central region is at most decagonal.

1 . Method for the production of a can, said can comprising two circular end elements ( 4 ,  5 ), forming the base and the lid, the first one ( 4 ) of said circular end elements having substantially a same size as the second one ( 5 ), and a polygonally prefolded can sleeve closed all around which has fold lines ( 14 ) oriented parallel to its longitudinal axis, said fold lines forming edges ( 1 ) over their entire length, the can sleeve ( 2 ) having a circular cross-sectional area at both ends and a polygonal cross-sectional area in its central region, wherein the polygonal cross-sectional area in the central region is at least hexagonal and at most decagonal, wherein individual segments between the fold lines arch inwards and the edges formed by the fold lines arch outwards,
 wherein a can sleeve ( 2 ) having edges ( 1 ) parallel to the can axis, which is closed all round and present in a polygonally prefolded form, is folded out and initially brought into a circular shape at an opening and is provided with a circular first end element ( 4 ), whereupon, after filling of the can, the can sleeve ( 2 ) is also brought into a circular shape at its other opening and is provided with a circular second end element ( 5 ),   wherein a can sleeve ( 2 ) having at most a decagonal cross-sectional area is used and the circular shape is achieved by at least one of drawing the can sleeve ( 2 ) onto a cylindrical intermediate shaping mandrel ( 3 ), which is pulled off again after mounting of the first end element ( 4 ), or by applying at least two intermediate shaping jaws ( 6 ) from the outside.   
     
     
         2 . Method according to  claim 1 , wherein a preforming means ( 7 ), is provided so that the can sleeve ( 2 ) is preshaped at at least one end for a further step of the method. 
     
     
         3 . Method according to  claim 1 , wherein at least one of the first ( 4 ) or second ( 5 ) end element is joined with a tight seal, with the can sleeve ( 2 ) by at least one of a first or second sealing means ( 9 ). 
     
     
         4 . Method according to  claim 3 , wherein at least one of the first or the second sealing device ( 9 ) is pressed in the radial direction against the inside and outside of the first ( 4 ) or of the second ( 5 ) end element. 
     
     
         5 . Method according to  claim 1 , wherein, before mounting of the first ( 4 ) or second ( 5 ) end element, a sheet-like sealing element ( 11 ) is tightly joined in one of the two cylindrical end regions of the can sleeve to the inside ( 12 ) thereof. 
     
     
         6 . Device for the production of a can by the method according to  claim 1 , wherein it contains a cylindrical intermediate shaping mandrel ( 3 ) which is provided on its end face with a feed bevel ( 3 ) for the can sleeve ( 2 ). 
     
     
         7 . Device according to  claim 6 , wherein the intermediate shaping mandrel ( 3 ) is displaceable about its axis relative to the device. 
     
     
         8 . Device according to  claim 7 , wherein a preshaping means ( 7 ) with which the can sleeve ( 2 ) can be preshaped at least one end for a further step of the method is arranged on the intermediate shaping mandrel ( 3 ). 
     
     
         9 . The method of  claim 1 , wherein the can includes a sheet-like sealing element ( 11 ), is joined with a tight seal all round, to the inside ( 12 ) of the can sleeve ( 2 ) in one of the two end regions and said sealing element is sealed or adhesively bonded to the inside of said can sleeve. 
     
     
         10 . The method of  claim 1 , wherein said can sleeve has a hexagonal or octagonal cross-sectional area. 
     
     
         11 . The method of  claim 2 , wherein the preforming means is an intermediate shaping mandrel. 
     
     
         12 . The method of  claim 2 , wherein said preshaped comprises preflanged. 
     
     
         13 . The method of  claim 3 , wherein said joined comprises rolled, flanged or sealed. 
     
     
         14 . The method of  claim 5 , wherein said joined comprises heat-sealed or adhesively bonded.