FIELD: casings adapted to be filled with food product such as meat, in particular, coatings for ham and sausages.
SUBSTANCE: according to first version, casing is made in the form of sleeve manufactured from five-layered film material, with first layer making outer layer and fifth layer making inner layer. First and fifth layers are manufactured from polyamide 6 or mixture of polyamide 6, copolyamide 6/6 and amorphous polyamide, second layer is binder between first and third layers and is made from modified polyethylene serving as adhesive, third layer is made from polypropylene, forth layer serves as binder between third and fifth layers and is made from modified polyethylene . According to second version, casing is made in the form of sleeve from five-layer film material, first layer serving as outer layer and fifth layer serving as inner layer. First layer is made from polyamide 6 or mixture of polyamide 6, copolyamide 6/6 and amorphous polyamide, second layer serving as binder between first and third layers is made from modified polyethylene serving as adhesive, third and fifth layers made from high-pressure polyethylene, fourth layer serving as binder between third and fifth layers is made from modified polyethylene. In both versions, sectional thickness of casing is D=40-60 microns, thickness of first layer is d1=(0.5-0.6)D, thickness of second and forth layers is d2=d4=(0.04-0.06)D, thickness of third layer is d3=(0.2-0.3)D, and thickness of fifth layer is d5=(0.08-0.12)D. During utilization, edges of casing may be secured by means of squeezing members manufactured from plastic material, such as aluminum or alloy thereof. Edges of casing may be also secured by means of welded joint allowing hermetically sealed cavity for receiving of food product to be defined. Air is pumped out of said hermetically sealed cavity or hermetically sealed cavity is filled with inert gas medium.
EFFECT: improved protecting properties of casing used for packaging of food products.
10 cl, 5 dwg
