New High Barrier Lidding Materials: Optimization Studies to Understand Seal Peel Characteristics to Different Consumer Cup Substrates

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Extrusion coated paper based & aluminum free high barrier lidding materials have been developed by StoraEnso specialty papers with good oxygen barrier properties, die cutting, print and seal peel properties. Since foil based lidding materials have poor abuse resistance and are hampered by metal detection systems, aesthetically valued & user friendly coated paper based paper/poly lidding materials can be developed. Using polymer combos & the knowledge on cohesive failure mechanisms, optimization techniques were developed to characterize seal peel mechanisms to various consumer cup substrates made with polypropylene (PP), polystyrene (PS), high impact polystyrene (HIPS), high density polyethylene (HDPE) & low density polyethylene (LDPE). These laboratory optimization techniques can be used to characterize the effect of polymer interactions with cup substrates in terms of sealing, peeling and leak mechanisms as it relates to field performance.