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A mathematical model for the prediction of water vapour transmission rate at different temperature and relative humidity combinations
Author(s) -
Piergiovanni Luciano,
Fava Patrizia,
Siciliano Antonio
Publication year - 1995
Publication title -
packaging technology and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 50
eISSN - 1099-1522
pISSN - 0894-3214
DOI - 10.1002/pts.2770080203
Subject(s) - water vapor , relative humidity , low density polyethylene , materials science , gravimetric analysis , humidity , permeance , transmission rate , polyethylene , vapour pressure of water , composite material , thermodynamics , transmission (telecommunications) , analytical chemistry (journal) , chemistry , chromatography , organic chemistry , physics , selectivity , electrical engineering , engineering , catalysis
A simple mathematical procedure for the estimation of water vapour transmission rate under different conditions is presented and discussed. The ASTM dynamic and gravimetric methods were used for measuring the water vapour transmission rate of four thin plastic films (PET 19 μm, PVC 16 μm, EVA 15 μm and LDPE 23 μm) under 38 different conditions of temperature and relative humidity and the corresponding permeance values were drawn. On the basis of the Clausius Clapeyron's relationship between temperature and water vapour pressure, a simple equation was derived for a rapid transformation of water vapour transmission rate data. The mathematical procedure was applied to the data collected for the four thin films and good agreement was found between observed and predicted values for the PET and LDPE films, while for the PVC and EVA films the equation developed led to an overestimate of water vapour transmission at the lower temperatures.