Patent ID: 8167489
Filing Date: 2012-05-01
Classification: B65D

Abstract:
1. A packaging bag for secondary packaging to be accommodated in a transport container configured to transport an infectious substance in primary packaging, secondary packaging, and tertiary packaging, the packaging bag comprising: a front surface material and a back surface material, the front surface material being placed on top of the back surface material, the front surface material and the back surface material being formed into a bag member by heat-sealing both side edge portions and a bottom edge portion, and an opening being provided at an upper end edge portion of the bag member by not heat-sealing the upper end edge portion; partitioning materials disposed respectively on inner surfaces of the front surface material and the back surface material on the side of upper ends which corresponds to the opening, the partitioning materials being attached respectively to the front surface material and the back surface material by heat-sealing the upper end edge portion and the both side edge portions to form pocket portions; and a sealing material for being stuck with an adhesive device to the back surface material on the outside of an upper end portion thereof so as to close the opening, wherein a surface contact between the partitioning materials is maintained even when an internal pressure in the packaging bag is increased such that a pressure difference with respect to the internal pressure reaches 95 kPa or larger, and the corresponding internal pressure is received by any one of the pocket portions, wherein a length of the partitioning materials is ¼ to ½ of a length of the opening of the packaging bag, wherein each of the front surface material and the back surface material is formed of a plastic sheet or film which has a three-layer structure of PET20/NY20/LLDPE70, and wherein each of the partitioning materials is formed of a plastic sheet or film having a three-layer structure of LLDPE30/NY20/LLDPE70, and the LLDPE30 layer on the surface-contact side contains EVA in an amount of 3 to 10%.