| 摘要 |
A flexible pouch comprises two layers of heatsealable thermoplastics material applied to opposite surfaces of an intermediate layer other than a layer of metal foil or to surfaces of each other, the materials of the said two layers having limited compatibility and the pouch being sealed, where it will require to be opened, at a line or lines of contact between surfaces of different layers of the materials. An intermediate layer may be of transparent or opaque material or of a material loaded with a salt capable of keeping the moisture condition of contents of a pouch within limites required for their protection. |
