Side fold sack with roll bottom

Abstract

A side fold sack of polyolefin material that includes a tubular segment having side folds between front and rear walls of the tube. The bottom of the sack exhibits at least one fold of the tubular segment made at 180° about an axis which is generally transverse to the side folds. At least part of the folded area is covered with a label that provides support to the bottom of the sack.

1 . Side fold sack from polyolefin material, which exhibits following features: 
 an area of a tubular segment, with front walls and side walls of the sack, whereby the side walls exhibit side folds,    a bottom area at an end of the area of the tube segment, which exhibits at least one fold of the tube piece material made at 180° about the axis, which runs essentially transversally to the side folds, characterized by a label, which covers at least parts of the folded area.    
   
   
       2 . Side fold sack according to the preceding claim, characterized in that the sack material includes fabrics of oriented polyolefin material.  
   
   
       3 . Side fold sack according to  claim 1 , characterized in that the joints of the label with the tube material, and/or of the flapped over tube material with at least one wall of the segment of the tube material, are heat induced.  
   
   
       4 . Side fold sack according to  claim 1  one of the preceding claim, characterized in that at least one bottom area comprises two folds of the tubular segment material folded at 180° about an axis, which runs essentially transversally to the side folds.  
   
   
       5 . Method for fabrication of side fold sack, 
 in which segments of a side fold tube are provided and    in which in at least one end area of the segment, a fold of the tubular segment material is made at 180° about an axis, which is essentially transversal to the side folds, characterized in that at least parts of the folded regions are covered with a label.    
   
   
       6 . Method according to  claim 5 , characterized in that the bonding processes, which lead to the seaming of the folded tubular segment material with at least one wall of an area of the tubular segment and or the bonding processes which lead to the seaming of the flapped over tubular segment material with the label, are heat induced at least in part.  
   
   
       7 . Method according to the preceding claim, characterized in that the heat for the heat induced bonding process is supplied at least in part by means of air.  
   
   
       8 . Method according to  claim 6 , characterized in that at least a part of the coating made on the sack material is bonded by melting by means of heat.  
   
   
       9 . Method according to  claim 5 , characterized in that the sack is made from a tube segment.  
   
   
       10 . Method according to the preceding claim, characterized in that the tube segment is made from a tube with staggered cuts and/or straight cuts.  
   
   
       11 . Side fold sack according to  claim 2 , characterized in that the joints of the label with the tube material, and/or of the flapped over tube material with at least one wall of the segment of the tube material, are heat induced.  
   
   
       12 . Side fold sack according to  claim 2 , characterized in that at least one bottom area comprises two folds of the tubular segment material folded at 180° about an axis, which runs essentially transversally to the side folds.  
   
   
       13 . Side fold sack according to  claim 3 , characterized in that at least one bottom area comprises two folds of the tubular segment material folded at 180° about an axis, which runs essentially transversally to the side folds.  
   
   
       14 . Method according to  claim 7 , characterized in that at least a part of the coating made on the sack material is bonded by melting by means of heat.  
   
   
       15 . Method according to  claim 6 , characterized in that the sack is made from a tube segment.  
   
   
       16 . Method according to  claim 7 , characterized in that the sack is made from a tube segment.  
   
   
       17 . Method according to  claim 8 , characterized in that the sack is made from a tube segment.