Walls for tubular cartons

Abstract

A blank ( 2 ) for a wall of a tubular carton, the blank having a first panel ( 4 ) and a second panel ( 6 ), whereby with the first panel ( 4 ) folded to a face to face relationship with the second panel, the folded blank has a first end including extension to engage the first end with an opposite second end of the folded blank ( 2 ). The first panel ( 4 ) is connected to the second panel ( 6 ) by a connecting part ( 8 ) which extends along a portion only of a mutual edge of the first and second panels ( 4, 6 ) adjacent the engaging extension ( 14 ).

I claim:  
     
         1 . A blank for a wall of a tubular carton, the blank comprising a first panel and a second panel, whereby with the first panel folded to a face to face relationship with the second panel, the folded blank has a first end with means to engage the first end with an opposite second end of the folded blank, the first panel being connected to the second panel by a connecting part, which connecting part extends along a part only of a mutual edge of the first and second panels adjacent the engaging means.  
     
     
         2 . A blank according to  claim 1 , in which the mutual edge of the first and second panels is free from non-frangible connections apart from the connecting part.  
     
     
         3 . A blank according to  claim 1 , in which the connecting part extends along a minor part only of the edge adjacent the connecting means.  
     
     
         4 . A blank according to  claim 3 , in which the connecting part extends for between about 3 cm and about 5 cm.  
     
     
         5 . A blank according to  claim 4 , in which the connecting part extends for about 4 cm.  
     
     
         6 . A blank according to  claim 3 , in which the connecting part extends for about ⅕ of the circumference of a tubular carton outer wall formed from the blank.  
     
     
         7 . A blank according to  claim 1 , in which the connecting part is generally central relative to the first and second panels.  
     
     
         8 . A blank according to  claim 1 , in which the connecting part provides a hinged connection between the first and second panels.  
     
     
         9 . A blank according to  claim 1 , in which there is provided a frangible tab between the first panel and the second panel.  
     
     
         10 . A blank according to  claim 9 , in which there is provided a plurality of frangible tabs between the first panel and the second panel.  
     
     
         11 . A blank according to  claim 10 , in which a first frangible tab is provided on one side of the connecting part and another frangible tab is provided on the other side of the connecting part.  
     
     
         12 . A blank according to  claim 9 , in which a frangible tab is provided in the region of an end of a panel.  
     
     
         13 . A tubular carton wall comprising a blank having a first panel and a second panel, the first panel overlying a substantial part of the second panel and being in a face to face relationship with the second panel in which the first and second panels are connected by a connecting part along part only of an edge of the tubular carton wall.  
     
     
         14 . A tubular carton wall according to  claim 13 , in which the connecting part extends along a minor part only of the edge.  
     
     
         15 . A tubular carton wall according to  claim 14 , in which the connecting part extends for between about 3 cm and about 5 cm.  
     
     
         16 . A tubular carton wall according to  claim 15 , in which the connecting part extends for about 4 cm.  
     
     
         17 . A tubular carton wall according to  claim 14 , in which the connecting part extends for about ⅕ of the circumference of a tubular carton wall formed from the blank.  
     
     
         18 . A tubular carton wall according to  claim 13 , in which the connecting part is generally central relative to the first and second panels.  
     
     
         19 . A tubular carton wall according to  claim 13 , in which an adhesive secures the first panel to the second panel.  
     
     
         20 . A tubular carton wall according to  claim 13 , in which the tubular carton wall is non-circular in cross-section.  
     
     
         21 . A tubular carton wall according to  claim 13 , made from a blank according to  claim 1 .  
     
     
         22 . A method of manufacturing a tubular carton wall from a blank according to  claim 1 , which method comprises the steps of providing an adhesive for securing the first and second panels, positioning the first and second panels in a substantially face to face relationship, holding the blank in the region of the connected part thereof and shaping the blank to the required shape.