Bags

Abstract

Disclosed is a bag ( 11 ), and a method of making the bag, having a welded end ( 12 ) and an open end ( 13 ) having a series of flaps or tie parts ( 14 ) formed thereon. The bag is formed from a tubular body folded upon itself along its longitudinal central region whereby no more than two gussets are formed along each longitudinal edge of the bag. A roll ( 10 ) of bags ( 11 ) is also disclosed in which the welded end ( 12 ) of one bag is joined by a line of weakness ( 15 ) to the flap or tie parts ( 14 ) of the next bag in the roll.

1 . A bag having a welded end and an open end having a series of alternating valleys and projections formed thereon with said projections providing flaps or tie parts, wherein the bag is formed from the tubular body folded upon itself at least once along its longitudinal central region, and wherein no more than two gussets are formed along each longitudinal edge of the bag.  
   
   
       2 . A bag as claimed in  claim 1 , wherein the tubular body is folded upon itself whereby at least one fold overlies another portion of the bag along each longitudinal edge thereof.  
   
   
       3 . A method of forming a bag having a welded end and an open end having a series of alternating valleys and projections formed thereon with said projections providing flaps or tie parts, wherein a tubular body is folded upon itself at least once along its longitudinal central region and whereby no more than two gussets are formed along each longitudinal edge of the bag.  
   
   
       4 . A method of forming a bag as claimed in  claim 3 , wherein outer side edge portions of the tubular body are firstly folded inwardly across adjacent portions of the remainder of the tubular body and to the centre line of the tubular body but on opposite sides thereof, whereafter the tubular body is folded upon itself along its longitudinal centre line.  
   
   
       5 . A method of forming a bag as claimed in  claim 3 , wherein outer side edge portions of the tubular body are firstly folded inwardly across adjacent portions of the remainder of the tubular body to the centre line of the tubular body and on the same side thereof, whereafter the tubular body is folded upon itself along its longitudinal centre line.  
   
   
       6 . A method of forming a bag as claimed in  claim 5 , wherein the tubular body is folded upon itself along its longitudinal centre line on the side opposite to the folded side edge portions.  
   
   
       7 . A method of forming a bag as claimed in  claim 5 , wherein the tubular body is folded upon itself along its longitudinal centre line on the same opposite as the folded side edge portions.  
   
   
       8 . A method of forming a bag as claimed in  claim 3 , wherein the tubular body is folded upon itself along its longitudinal centre line, whereafter the tubular body is once again folded upon itself along the longitudinal centre line of the previously folded tubular bag.  
   
   
       9 . A method of forming a bag as claimed in  claim 3 , whereinafter folding of the tubular body the welded end of the bag, and the valleys and projections of the open end of the bag, are formed.  
   
   
       10 . A bag produced in accordance with the method of  claim 3 .  
   
   
       11 . A roll of bags of the type defined in  claim 1 , wherein the welded end of one bag is joined by a line of weakness to the projections of the open end of the next bag in the roll.  
   
   
       12 - 14 . (canceled)