| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to multilayered flat or sleeve envelope for food products, in particular for packing food products. Multilayered envelope or film, manufactured by method of blow extrusion and stretched on two axes by method of triple bubble, contains, at least, seven layers, and as component part layers contain: first outer layer - polycaprolactam (PA6), polyhexamethylene adipineamide (PA66), PA6/66, PAH, PA12 or mixtures of said polyamides, polyolefin or mixtures of different polyolefins, cycloolefic copolymer (COC) or mixture of cycloolefic copolymer (COC) and polyolefin, polucarbonate (PC) or polystirol (PS); second outer layer - adhesion promoter; third layer from outside- ionomer; fourth layer from outside- adhesion promoter; fifth layer from outside - copolymer of ethylene and vinyl alcohol (EVOH); sixth layer from outside - adhesion promoter; seventh layer from outside - polyolefin.EFFECT: invention provides possibility of essential increase of processing rate (number of working cycles), along with good optic properties, such as luster an transparency, as well as high thermal stability of outer layer, satisfactory degree of shrinkage and reliable barrier properties for oxygen and water vapour, with considerable mechanical strength.8 cl |
