LAMINATED FILM, METHOD FOR ITS PRODUCTION AND CARGO PACKAGED WITH EMPLOYMENT OF FILM Russian patent published in 2000 - IPC

FIELD: production of stretchable stiff films intended for packaging on pallets. SUBSTANCE: laminated film for packaging of pallets is made of the main layer with a yield point at stretching within 15 to 70 n/sq.mm and percentage elongation at rupture within 60 to 500%, containing the main component low-density linear polyethylene L-PENP with a density of 0.915 to 0.935 g/cu.cm. In the method for production of laminated film by coextrusion use is made of a group of extruders, and linear L-PENP with a density of 0.915 to 0.935 g/cu.cm is extruded in a mixture with low-density polyethylene PENP that is used in an amount of 8 to 40% of the mass of L-PENP. Material coming out of the extruders is laminated, forced through the slot of the expanding head and placed on the first chilled roll chilled at a temperature of 10 to 25 C. Then, it is fed to the second roll chilled at a temperature equal to or below the temperature of the first roll and making up 10 to 20 C. The second roll is rotated at a speed exceeding the rotary speed of the first roll makes up 2 to 5 mm. The distance between the edge and the point of contact on the first roll makes up 10 to 15 mm. EFFECT: enhanced stiffness and sufficiently stretchable film fitted for packaging of light cargoes, medium-weight cargoes, bales and structural members and laminates. 20 cl, 2 dwg, 3 ex