| In this paper, the performance of mechanics, gas permeation and anti-bacterial of different nano-polymers'film is studied. And the quality of ber planted in torrid zone packed with films and stored at different temperature was investigated.Firstly, nano- TiO2 was prepared and used to modify thin films, the effects of the adding amounts of filler on the permeation and mechanical property of films were studied. The results showed that nano- TiO2 could be dispersed into films equably; the amounts of nano- TiO2 increased, the mechanical property appeared increasing first and then decreasing; but the gas permeation rate decreased gradually.Secondly, the anti-bacterial of nano- TiO2/polymer films and the influence of nano-TiO2 dose to anti-bacterial of LDPE film were studied. The results indicated that when the adding amount is 2, the films have anti-bacterial activity, and the anti-bacterial rate were 41.67% of PVC film,21.43%of PP film and 31.43% of LDPE film.At last, nano-TiO2/LDPE films with different gas permeation were used to pack ber , which stored at normal and refrigerate temperature. The preserving performance was analyzed. The result showed that the preserving effects of polymer film packaging is better than others, and when the nano-TiO2/LDPE films with O2 permeation to 6491.23cm3/m2·d·bar, and CO2 permeation to 24346.84 cm3/m2·d·bar, ber can be preserved more than 18 days at normal temperature and 58days at cold storage.
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