按照下式计算水蒸气透过率和水蒸气透过系数。
Calculate the water vapor transmission, and permeance as follow.
水蒸气透过系数；
随着紫胶用量的增加，膜的溶胀倍数、水蒸气透过系数先降低后变化不大，而拉伸强度上升；
With the increase of lac dosage, solvent swell and water vapor permeability decreased first followed by insignificant change, while tensile strength increased.
随着紫胶用量的增加，膜的溶胀倍数、水蒸气透过系数先降低后变化不大，而拉伸强度上升；
With the increase of lac dosage, solvent swell and water vapor permeability decreased first followed by insignificant change, while tensile strength increased.
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