Water Vapor Transmission Rate of Biomass Based Film Materials

Biomass based film materials have gained attention due to their carbon neutrality. Film materials which were designed for packaging of fresh produce require good water vapor transport control to extend the shelf life of the products. In this study the water vapor transmission rate was investigated and measured by a modified technique of wet cup method, according to ASTM E 96. Biomass based film materials presented higher value of water vapor transmission rate compared to the conventional polyethylene films. Loading of scallop-shell powder increased the ability of the film to absorb or immobilize water due to enhancement of the formation of pores when the film was stretched. In addition, the water vapor transmission rate increased with increasing temperature or relative humidity difference.