B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/71.06
B32B 27/08 (2006.01) B29D 7/01 (2006.01) B32B 27/28 (2006.01) B32B 27/30 (2006.01) B32B 27/32 (2006.01)
Patent
CA 1221610
ABSTRACT OF THE DISCLOSURE A film laminate comprising a base film and a first sealant web with a coating of polyvinylidene chloride (PVDC) sandwiched therebetween is disclosed. The first sealant web is selected from the group consisting of a) film made from a copolymer of ethylene and vinyl acetate, and b) a film made from a blend of i) a copolymer of ethylene and vinyl acetate with ii) a homopolymer of ethylene, or a copolymer of ethylene and one or more C4 to C10 .alpha.-olefins, said homo- polymer or copolymer having a density of from about 0.915 to about 0.955 g/cm3, or blends of said homopolymer and copoly- mer. The base film is selected from the group consisting of unmetallized or metallized oriented nylon film, oriented polyester film, oriented polypropylene film, cast nylon film, polyethylene film and a second sealant web, said second sealant web being selected from the same group as said first sealant web and having a slip coefficient of less than about 0.4. The PVDC coating consists of at least one layer, the layers being characterized by failing a Solvent Haze Test, and preferably having a crystallinity index of less than 1.15 if dried and allowed to stand for 30 days at 20°C and, if the base film is selected from nylon film, polyester film or polypropylene film, the layer in contact with the base film being further characterized by having a crystallinity index of from 1.12 to 1.25 if dried and allowed to stand for 5 days at 40°C. If the base film is metal coated, then the PVDC is in direct contact with the metal. A process for forming the laminate is also disclosed. The process comprises bringing the base film and the first sealant web together between a nip roll and a hot roll, said PVDC coating having been applied to at least the base film or the first sealant web, with the proviso that if the first or second sealant web is in contact with the hot roll then said web which contacts the hot roll has a slip coefficient of less than about 0.4. The laminates may be used for packaging comestibles e.g. bacon, wieners and cheese. DC-0160A
433854
Liqui-Box Canada Inc.
Mccallum Brooks & Co.
LandOfFree
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