POLYMER FILM MATERIAL FOR GUARDING OF GREENHOUSE AND METHOD FOR ITS PRODUCTION Russian patent published in 1996 - IPC

FIELD: agriculture. SUBSTANCE: proposed film material contains high pressure polyethylene or copolymer of ethylene with vinyl acetate and benzone (their quantities being 99.0-99.2 mass % and 0.8-1.0 mass % respectively). Desired material is prepared by cold mixing of granulated high pressure polyethylene or copolymer of ethylene with ethyl acetate and benzone within 5-10 min at 10-30 C. The process is carried out till homogeneous mixture is prepared. Then said mixture is heated to 170-180 C (for mixture which contains high pressure polyethylene) or to 130-140 C (for mixture which contains copolymer of ethylene and vinyl acetate) and film material is formed by melt extrusion under pressure. EFFECT: increases productivity of vegetables. 3 cl