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 . Can comprising two circular end elements ( 4 ,  5 ) forming the base and the lid, and comprising a can sleeve which has fold lines ( 14 ) forming edges ( 1 ), the can sleeve ( 2 ) having a circular cross-sectional area at both ends and a polygonal cross-sectional area in its central region, characterized in that the polygonal cross-sectional area in the central region is at most decagonal.  
     
     
         2 . Can according to  claim 1 , characterized in that at least one of the two end elements ( 4 ,  5 ) is joined with a tight seal, to the can sleeve ( 2 ), or is in the form of an inserted lid or push-over lid.  
     
     
         3 . Can according to  claim 1 , characterized in that 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.  
     
     
         4 . Can according to  claim 1 , characterized in that the can sleeve ( 2 ) has an internal circumference which is 0.5 to 1 mm smaller than that circumference of the end element ( 5 ) which comes into contact with it.  
     
     
         5 . Can according to  claim 1 , characterized in that the can sleeve ( 2 ) comprises a piece of at least one of a paper or cardboard composite.  
     
     
         6 . Method for the production of a can according to claim  1 , 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 ), characterized in that 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.  
     
     
         7 . Method according to  claim 6 , characterized in that 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.  
     
     
         8 . Method according to  claim 6 , characterized in that 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 ).  
     
     
         9 . Method according to  claim 8 , characterized in that 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.  
     
     
         10 . Method according to  claim 6 , characterized in that, 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.  
     
     
         11 . Device for the production of a can by the method according to  claim 6 , characterized in that 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 ).  
     
     
         12 . Device according to  claim 10 , characterized in that the intermediate shaping mandrel ( 3 ) is displaceable about its axis relative to the device.  
     
     
         13 . Device according to  claim 11 , characterized in that 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 ).  
     
     
         14 . The can of  claim 3  wherein said sealing element is a paper or aluminum membrane.  
     
     
         15 . The method of  claim 3  wherein said sealing element is sealed or adhesively bonded to the inside of said can sleeve.  
     
     
         16 . The can of  claim 2  wherein said joined comprises rolled, flanged, adhesively bonded or sealed.  
     
     
         17 . A can of  claim 5  wherein said piece is laminated with at least one of plastic or aluminum.  
     
     
         18 . The method of  claim 6  wherein said can sleeve has a hexagonal or octagonal cross-sectional area.  
     
     
         19 . The method of  claim 7  wherein the preforming means is an intermediate shaping mandrel.  
     
     
         20 . The method of  claim 7  wherein said preshaped comprises preflanged.  
     
     
         21 . The method of  claim 8  wherein said joined comprises rolled, flanged or sealed.  
     
     
         22 . The method of  claim 10  wherein said joined comprises heat-sealed or adhesively bonded.  
     
     
         23 . The device of  claim 13  wherein said preshaped comprises preflanged,  
     
     
         24 . The can of  claim 1  wherein the polygonal cross-sectional area in the central region is hexagonal or octagonal.