SHEET-TYPE PACKING MATERIAL TO PRODUCE PACKAGES, PACKAGE FOR PACKING AND METHOD OF ITS PRODUCTION Russian patent published in 1995 - IPC

FIELD: chemical industry. SUBSTANCE: sheet-type packing material to produce packages additionally has sliding substance wax in amount of 500 3000 shares per million shares of resin of film. Sheet-type material has partial penetrability for aromatic substances and penetrability for oxygen of no less than 600 сm³/m²/day/bar. Duration of sheet material using since the moment of its production till package production is equal to 2 - 24 weeks. Besides welded layer from film based on copolymer ethylenevynylacetate has at least 18 of vinyl acetate with layer thickness of 50 200 mcm and barrier layer thickness of 25 100 mcm. In packing package, welded to form closed volume from sheet-type material the sheet-type material additionally has sliding substance wax in amount of 500 3000 shares per million shares of resin of film. Sheet-type material has partial penetrability for aromatic substances and penetrability for oxygen of no less than 600 сm³/m²/day/bar. Duration of sheet material application since the moment of its production till package production is equal to 2 24 weeks. Besides welded layer, made of film based on copolymer ethylenevinyl acetate has at least 18 of vinyl acetate with layer thickness of 50 200 mcm and barrier layer thickness of 25 100 mcm. Upper part of package has small nose. According to method of packing packages production, welding of sheet-type material layers is exercised by method of high frequency heating. In the case connecting layers are laid with overlapping each other. They use sheet-type material, in which additionally they introduce sliding substance wax in amount of 500 - 3000 shares per million shares of resin of film. Sheet-type material has partial penetrability for oxygen of 600 сm³/m²/day/bar. Welding of sheet-type material is exercised within 2 24 weeks after its production. Besides they use sheet-type material, in which welded layer from film based on copolymer ethylenevinyl acetate has at least 18 of vinyl acetate with layer thickness of 50 200 mcm and barrier layer thickness of 25 100 mcm. Upper part of package has small nose. EFFECT: sheet-type packing material and packages are produced by chemical industry. 8 cl, 1 dwg