| 摘要 |
<p>The invention relates to a package for storing and preserving liquids and pastes, especially the alimentary ones. According to the invention, the package is of the bag-type, being provided with a valve for filling and evacuating the packed product, which is introduced into a box with rigid walls made of cardboard or other adequate material, and comprises 5-9 layers, of which at least two external layers consisting of polyolefins, non-polar olefin copolymers comprising hydrocarbon structural groups or the mixture thereof, at least a gas barrier layer consisting of polyamides, vinyl alcohol ethylene copolymer, thermoplastic polyepoxide polymer or thermoplastic polyethyleneterephthalate or polyethylene naphthenate polyesters and a polymer layer comprising both non-polar hydrocarbon groups, and polar hydroxyl, carbonyl, anhydride, carboxyl or ionomer groups, said layer being placed at each polyolefin layer interface with a barrier layer and wherein at least one of the comprised external polyolefin layers is in expanded, porous, closed pores form.</p> |
