Abstract
A new static-cell method for determining the gas transmission rates of packaging film is described. Unlike previous techniques, this technique is not limited to just two data points separated by a small change in gas concentration. A sample of film is pressed over the cell cavity which is then flushed with a starting gas mixture. The external side of the film is exposed to atmospheric air. Measurements of cavity gas concentration over time are used to obtain the exponential decay constant for the cell which leads directly to calculation of the gas transmission rate. Experiments were conducted with two polyethylene films and one Mylar film at temperatures ranging from 0 to 42 C. The test cells gave simultaneous values of O2 and CO2 transmission rates that were corroborated by independent tests in a MOCON apparatus. The variation of transmission rate with temperature was well described by an Arrhenius relationship. The static test cell functions reliably with no low-temperature condensation problems and permits collection of as many data points as necessary to obtain a reliable value for the decay constant.
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