Packing bag structure
A packing bag structure formed of inner and outer bag members made of synthetic resin inner and outer films having different moisture permeabilities enables easy-to-dry moist foods or other perishable products to be packed in a suitable state and stored in a non-soggy and untarnished condition. The inner film has moisture permeability of 9 to 200 g/(m 2 ·24 h), preferably 20 to 30 g/(m 2 ·24 h), and the outer film has moisture permeability of 4 to 15 g/(m 2 ·24 h), preferably 7 to 10 g/(m 2 ·24 h). The packing bag is produced by folding a long film sheet formed of the inner and outer films into two, having an article such as food placed between the twofold film sheet, thermally sealing the film sheet by using an end sealer and cutting off the packed and sealed portion.
1. A packing bag structure for Maitake mushroom, comprising an inner bag member made of an inner film of synthetic resin, and an outer bag member made of an outer film of synthetic resin and provided outside to cover said inner bag member, said inner film having moisture permeability of 9.2 to 186 g/(m 2 ·24 h), said outer film having moisture permeability of 5.3 to 9.2 g/(m 2 ·24 h), said inner and outer films having their end parts thermally welded together to form an air layer between said inner and outer bags and proportion in moisture permeability of 1.16 to 20.22.
2. The packing bag structure as claimed in claim 1 wherein at least one of the inner and outer films is coated on its inner surface with 0.1 to 5% by weight of anticlouding agent in aggregate.