Smokable synthetic food-packaging film

A smoked food package produced by packaging a foodstuff with a smokable film and smoking the packaged foodstuff wherein the smokable film comprises:

• a layer of a mixture of 50 to 80 wt.% polyamide having a melting point of 120.degree. to 210.degree. C. and a recrystallization temperature of not lower than 50.degree. C. and 20 to 50 wt.% of an .alpha.-olefin-vinyl alcohol copolymer;
• at least one layer of a thermoplastic material selected from the group consisting of (a) an .alpha.-olefin copolymer of polyethylene, polypropylene or polybutene-1, (b) a copolymer of ethylene, propylene or butene-1 and vinyl acetate or methacrylic ester, (c) a copolymer of ethylene, propylene or butene-1 and methacrylic acid, or a metal salt thereof, (d) an elastomer of a plasticized polyvinyl chloride, polyester or a styrene rubber, (e) a cellulose and (f) polyamide, said film having properties of an initial stress of not higher than 0.6 Kg/mm.sup.2 at a 25% elongation, a transmission to 50% concentration of methanol of not less than 200 g/m.sup.2.day.atm at a temperature of 60.degree. C. and a relative humidity of 0%, and an oxygen gas-transmission of not more than 50 cc/m.sup.2.day.atm at a temperature of 30.degree. C. and a relative humidity of 60%, and the thickness of the layer of said mixture being 20 to 60 .mu.m and the thickness of the layer of said thermoplastic material being 10 to 50 .mu.m.

A smoking process comprising packaging foodstuff with a smokable film and smoking the packaged foodstuff wherein a smokable film comprises a smokable food-packaging film comprising:

• a layer of a mixture of 50 to 80 wt.% polyamide having a melting point of 120.degree. to 210.degree. C. and a recrystallization temperature of not lower than 50.degree. C. and 20 to 50 wt.% of an .alpha.-olefin-vinyl alcohol copolymer;
• at least one layer of a thermoplastic material selected from the group consisting of (a) an .alpha.-olefin copolymer of polyethylene, polypropylene or polybutene-1, (b) a copolymer of ethylene, propylene or butene-1 and vinyl acetate or methacrylic ester, (c) a copolymer of ethylene, propylene or butene-1 and methacrylic acid, or a metal salt thereof, (d) an elastomer of a plasticized polyvinyl chloride, polyester or a styrene rubber, (e) a cellulose and (f) a polyamide, said film having properties of an initial stress of not higher than 0.6 Kg/mm.sup.2 at a 25% elongation, a transmission to 50% concentration of methanol of not less than 200 g/m.sup.2.day.atm at a temperature of 60.degree. C. and a relative humidity of 0%, and an oxygen gas-transmission of not more than 50 cc/m.sup.2.day.atm at a temperature of 30.degree. C. and a relative humidity of 60%, and the thickness of the layer of said mixture being 20 to 60 .mu.m and the thickness of the layer of said thermoplastic material being 10 to 50 .mu.m.