LAYERED PACKAGING FILM (VERSIONS) AND METHOD FOR MANUFACTURING THEREOF Russian patent published in 1999 - IPC

Abstract RU 2138399 C1

FIELD: plastics. SUBSTANCE: invention relates to packaging foods such as ham, beef, and fowl brisket. Layered, preferably biaxially oriented film comprises at least five basic successive layers. First layer consists of copolymer of propylene with at least one C2-C8-alpha-olefin containing al 60 wt % propylene and preferably having melting point lower than 140 C. Second layer consists of first copolymer of ethylene with at least one C4-C8-alpha-olefin having density 0.900-0.915 g/cu.cm and melt index below 1.0 deg-min; second copolymer of ethylene with 4- 18%, preferably 4-12% of vinyl ether or alkyl acrylate modified with anhydride of third copolymer of ethylene with at least one alpha-olefin, vinyl ether, or alkyl acrylate, and optionally fourth copolymer of ethylene with at least one C3-C8-alpha-olefin having density below 0.900 g/cu.cm and melting point lower than 85 C. Third layer consists of "Evon" material. Fourth layer is analogous to the second one. Fifth layer consists of above-mentioned first ethylene copolymer, second ethylene copolymer, and optionally third copolymer of ethylene with at least one C3-C8-alpha-olefin having density below 0.900 g/cu.cm and melting point lower than 85 C. Film has required combination of oxygen-protection properties, heat sealing ability, and good optical characteristics. Packaged foods can be cooked with no damage to weld seams and film layers. EFFECT: improved consumer's characteristics. 48 cl, 14 tbl, 23 ex

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RU 2 138 399 C1

Authors

Skott Allan Idlas

Dates

1999-09-27Published

1997-07-03Filed