Abstract 030
Air Ingress in Packages Sealed with Crowns Lined with Polyvinyl Chloride
J. Amer. Soc. Brew. Chem. 45: 14-18, 1987
T.J. Wisk and K.J. Siebert
GC measurements of package headspace gases indicated that significant amounts of O2 and N2 from air pass into bottles sealed with PVC-lined crowns. Transfer occurred because of differences in partial pressure of these gases inside and outside the package. Rate at which ingress occurred depended on temp., type of gas and nature and dimensions of barrier. For beer stored in air at room temp. in bottles sealed with PVC liners, the rate of ingress for O2 or N2 was about 0.002 ml/day. This was larger than expected based on the permeability of PVC. The phenomenon was not observed in bottles sealed with aluminum spot crowns or in cans. Flavour evaluation suggested that flavour stability was decreased by O2 ingress.
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