| 摘要 |
The matter of invention is the fabrication method of stretch pentalayer polyolefin film, in particular the plane film. the fabrication method of stretch pentalayer polyolefin film composed of following substrates: low density polyethylene, very low density polyethylene and metalocene linear polyethylene of low density, with the use of screw extruders feeding sheet die characteristic of that: - the copolymer of ethylene and n-hexene of mass flow rate (MFR) 1.0 to 6.0 g/10min; the best 4.0 g/min, was introduced to the first extruder feeding sheet die, used for the formation of first layer of thickness corresponding to 10-12% of total film thickness, - the mixture of copolymer of ethylene and n-hexene of MFR 1.0 to 6.0 g/10min; the best 4.0 g/min with copolymer of ethylene and n-hexene obtained in presence of metalocene catalyst, with MFR 1.0 to 6.0 g/10min; the best 4.0 g/min, in proportions 20-80% of the former; the best 50%, was introduced to the second extruder feeding sheet die, used for the formation of second layer of thickness corresponding to 28-32% of total film thickness, - the copolymer analogous to that introduced to first extruder, was introduced into third extruder feeding sheet die, used for the formation of third layer of thickness corresponding to 14-18% of total film thickness, - the mixture of copolymer of ethylene and n-hexene of MFR 1.0 to 6.0 g/10min, consisting 20-80%o contribution; the best 60% with polypropylene of MFR 2.0 to 6.0 g/10min, consisting 80-20% contribution; the best 40%, was introduced to the fourth extruder feeding sheet die, used for the formation of fourth layer of thickness corresponding to 28-32% of total film thickness, - the mixture of copolymer of ethylene and n-hexene of MFR 1.0 to 6.0 g/10min, consisting 40-95%) contribution; the best 80%, with copolymer of ethylene and n- hexene obtained in presence of metalocene catalyst, of MFR 1.0 to 6.0 g/10min, consisting 60-5% contribution; the best 20%, was introduced to the fifth extruder feeding sheet die. The temperature of sheet and separator was 260 °C. |
