METHOD FOR PREVENTING PINHOLE FROM OCCURRING TO INNER BAG OF BAG-IN-BOX

摘要

PROBLEM TO BE SOLVED: To prevent liquid in an inner bag from surging, and to prevent pinholes from being made to the inner bag because of repeated bending and rubbing by a method wherein the upper part of the inner bag of a bag-in-box is pressed with a pressing plate that follows lowering of liquid level that occurs, following swelling of the bag at its trunk. ;SOLUTION: A pressing plate 6 serving as a lid is mounted directly on the upper part of an inner bag 2, and a pressing member 7 is laid on top of the pressing plate, and the upper part of the pressing member 7 is bound crosswise with a band 8 and fixation is made therewith. Springs 9 are fixed on four positions at the underside of the pressing member 7, and the pressing plate 6 presses the inner bag 2 with force of the springs 9. Effective range of the spring 9 is set at an extent larger than the distance of lowering of the level of the liquid that occurs when the bag swells at its trunk. As the pressing plate 6 constantly presses the inner bag 2 with expansion of the springs 9 even though the level of the liquid is lowered with the bag swelled at its trunk during transportation, a vacant space is not produced in the bag-in-box, preventing the liquid from surging during transportation. Furthermore, pinholes that are liable to be produced by repeated bending or rubbing on contacting with a corrugated board box can be prevented, resulting in prevention of bag breaking.;COPYRIGHT: (C)1997,JPO