Bag-in-box inner bag

Abstract

A bag-in-box inner bag which has compatibility established therein between excellent self-standing ability and practical strength when the inner bag is to be handled without an outer box and which allows less liquid to remain during liquid discharge and makes it easy to hold container and is superior in container handling and handiness and which is rugged. This bag-in-box is a bag-in-box inner bag in the form of a self-standing bag comprising a front film having a charging/discharging spout, a rear film and a bottom film inserted between these two films, the three films being adhered by sealing, characterizing in that the bag-in-box inner bag has a corner part in the upper region divided from the containing part by the heat sealed part.

What is claim:  
     
         1 . An inner bag for bag-in-box comprising, a front film with a spout, a rear film and a self-standing bag prepared by adhering a bottom film to be folded in between said front film and rear film by heat sealing with said front and rear films, wherein said inner bag for bag-in-box possesses a corner part divided from a containing part by a heat sealed part at the upper position.  
     
     
         2 . The inner bag for bag-in-box of  claim 1 , wherein a hole is made in at least one corner part.  
     
     
         3 . The inner bag for bag-in-box in accordance with  claim 1  or  claim 2 , wherein the self-standing bag is a bag with a rectangular sole.  
     
     
         4 . The inner bag for bag-in-box of  claim 3 , wherein the triangle part locating to the lower part of the rectangular sole is cut off.  
     
     
         5 . The inner bag for bag-in-box in accordance with any one of claims  claim 1  to  claim 4 , wherein the bottom film is made of a laminate prepared by laminating so as a resin layer which is hard to be adhered by heat sealing is arranged on the outermost surface, and the front film and the rear film are adhered by heat sealing at or closely to the crossing point of the side periphery and the folding line of the bottom film by making a cut off part on said bottom film.