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This work is licensed under a Creative Commons Attribution 3.0 License.


The goal of this work was to study the effects of relative humidity (RH) and temperature on the barrier properties of biaxially-oriented polyvinyl alcohol (BOVLON) and polypropylene (BOPP) films. The water vapor transmission rate (WVTR) and the oxygen transmission rate (OTR) of the BOVLON and BOPP films were determined with MOCON PERMATRAN-W and MOCON OX-TRAN at 10℃-40℃ and 35%-90% RH. The results indicated that RH and temperature had different influence on the WVTR and OTR of the BOVLON and PP films. The OTR and WVTR values of the BOVLON films increase both exponentially with RH. Their WVTR values increase exponentially with temperature, but the OTR values decrease exponentially with the increase of temperature. For the PP films, the relationship between temperature and the WVTR and OTR followed an exponential grow curve [y=Aexp(x/B)+C], but the WVTR and OTR values were linear with the increase of RH. There was different linear tendency: the WVTR of the BOPP films increased with the increase of RH, the OTR of the BOPP films decreased.