Gusseted bag

Abstract

To provide a gusseted tubular article made of heat-sealable resin for making a bag which is not liable to be broken in the heat-sealed section even when a heavy load is put in it and a gusseted composite tubular article on the outside of which a different material is put. More specifically the preferred heat-sealable resin is a polyethylene-type resin comprising 100 to more than 50 wt % of linear low density polyethylene having density of 0.895 to 0.925 g/cm 3 and MFR of 0.1 to 10 g/10 minute, and 0 to less than 50 wT % of high-pressure low density polyethylene having density of 0.910 to 0.930 g/cm 3 and MFR of 0.1 to 10 g/10 minute.

What we claim:  
     
         1 . A gusseted tubular article for making a bag which is made of a polyethylene-type resin comprising 100 to more than 50 weight percent of linear low density polyethylene having density of 0.895 to 0.925 g/cm 3  and a melt flow rate of 0.1 to 10 g/10 minute and 0 to less than 50 weight percent of high-pressure low density polyethylene having density of 0.910 to 0.930 g/cm 3  and a melt flow rate of 0.1 to 10 g/10 minute.  
     
     
         2 . A gusseted bag obtained by heat-sealing one of the ends of the gusseted tubular article for making a bag described in  claim 1 .  
     
     
         3 . A gusseted composite tubular article for making a bag which comprises the gusseted tubular article described in  claim 1  and a gusseted tubular article made of a different material which is put on the outside of the former gusseted tubular article.  
     
     
         4 . A gusseted composite tubular article for making a bag according to  claim 3  wherein the different material is kraft paper.  
     
     
         5 . A gusseted composite tubular article for making a bag according to  claim 3  or  4  wherein the gusseted tubular article made of a different material which is put on the outside is so structured that both of its ends are sealable.  
     
     
         6 . A composite gusseted bag obtained from the gusseted composite tubular article described in any one of claims  3  through  5 , which is so structured that one of its ends is in alignment in a straight line at its end edge, and the end is sealed and folded, and the end is enclosed and fixed by a reinforcing paper with an opening tape to form a bottom section.  
     
     
         7 . A composite gusseted bag according to  claim 6  wherein a opening end of the tubular article has either a stairstepped section formed by extruding layers like stairs or at least one auxiliary flap so bonded to the outside wall surface that it forms a stairstepped surface protruding outside which can seal th opening end with a hot melt adhesive coated on its surface.  
     
     
         8 . A composite gusseted bag according to  claim 7  wherein the opening tape is attached in the width direction to the section which can form the seal.