For all samples Kw values increased as the DRH range moved
from lower to higher values (Table 3). For the DRH ranges of 2–33%
and 64–90%, Kw of P50 films presented values approximately 3.7
and 1.5 times lower if compared with starch films without fibers
(WF). However, at the intermediate gradient (33–64%), water vapor
permeabilities of WF films and P50 were of the same order
(3.43107 and 3.08 107 g/hmPa). For the P30 formulation the
Kw value was about 10 times higher when the DRH range passed
from 2–33% to 64–90%. This result can be explained by the
increasing of 8.3 times observed for the solubility coefficient b,