Multilayer tubular film based on polyamide

A multilayer seamless tubular film for packaging a meat product, comprising:

• a tubular shape having a wall thickness and a strength suitable for fitting on a machine for stuffing the tubular film under pressure with a meat product,
• an inner polymer layer in which the polymer comprises 40 to 100% by weight of aliphatic or partially aromatic polyamides or copolyamides or blends thereof;
• 0 to 60% by weight of carboxyl-containing ethylene copolymers or their salts and 0 to 20% by weight of other polymers, the total amount of which gives 100% by weight, the inner layer composition being selected to achieve a pre-selected degree of adhesion with respect to the type of meat product to be filled into the tubular film,
• an outer polymer layer in which the polymer comprises 70 to 100% by weight of aliphatic or partially aromatic polyamides or copolyamides or blends thereof, and 0 to 30% by weight of other polymers, and
• a middle polymer layer which consists essentially of 50 to 80% by weight of ethylene-methyl acrylate copolymers, wherein the methyl acrylate content is 5 to 30% by weight, and 20 to 50% by weight of ethylene-maleic anhydride copolymers, which contain 0.15 to 5% by weight of maleic anhydride units, the composition of the middle layer being selected to complement the composition of the inner layer and to thereby provide optimum properties for the packaged meat product depending on the type of meat product to be filled into the tubular film.