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1993
Journal Article
Titel
Barriereeigenschaften von aluminiumbedampften Kunststoffolien. Tl.2. Einfluß mechanischer Belastungen
Alternative
Barrier properties of aluminium-metallized polymer films. Part 2. Influence of mechanical stress
Abstract
Auswirkungen mechanischer Beanspruchungen auf die Barriereeigenschaften, wie sie beim Kaschieren, auf einer Verpackungsmaschine oder beim Transport der fertigen Verpackung auftreten, wurden untersucht. Abhängigkeiten zwischen Zugbeanspruchung und Durchlässigkeiten werden dargestellt. Die belasteten Folien wurden jeweils nach Fehlstellen untersucht. Zusammenhänge zwischen Fehlstellen und Durchlässigkeitseigenschaften werden diskutiert.
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The metallization of films by vacuum roll coating is a wellknown and established technique for production of high barrier packaging films. Despite the technical ability of producing such films there are general phenomena which are not understood at the moment: the mechanisms of gas permeation and adhesion, effects of both substrate properties as well as coating process parameters on both barrier properties as well as on the change of barrier properties after processing and use. Estimates on film utility for converting especially on packaging machines are currently empirical. It is known, that the evaporated metallic layer might be damaged by bending and tearing. Definitive causes are not known. Effects of mechanical stress occuring by lamination, on a packaging machine or transport of the hole package on barrier properties, have been investigated. Relations between tearing stresses and permeabilities are presented. Defects in the stressed films have been examined. Dependence between de fects and barrier properties are discussed.