materials feature | Multilayer films “The barrier property becomes established during
retort sterilisation,” said Suzuki. Toppan says the development should lead to oxygen
barrier containers that are resistant to retort-shock: ordinarily, the sterilisation process temporarily diminishes the effectiveness of the oxygen barrier, he said.
Alpha Mara- thon’s die
technology allows the creation of multiple
‘nanolayers’, to improve barrier properties
Migration control Irina Shtein Rozenman, antifog development specialist in the R&D department at Tosaf Compounds, explained how the company used a combination of surface treatment and barrier layers to control the migration of additives in multilayer films. “Our goal is to direct the migration to
the desired surface,” she said. For example, anti-fog additives –
which prevent water condensation – are directed to the food contact side of a film. Tosaf says that its new barrier
additive, called BR7483PE MB, is used
in the core layer of a typical three-layer film. The outer layer is a PE skin that is corona-treated, while the inner layer is also PE, and includes an anti-fog (AF) additive. Using a 10-15% loading of the new additive in the
core layer had no effect on optical or mechanical properties – and helped to halve the loading of anti-fog additive in the inner layer. “It prevents anti-fog migration from
the anti-fog side to the corona side,” she said.
Deep draw
Ube said that nylon copolymers can be used to create deeper draw thermoforming films. Nylon is already widely used in flexible packaging. Sergi Salva Saez, business development manager at Ube America, told delegates that new grades of nylon copolymer could be used to create barrier packaging with deeper thermo-
forming depths. He said that copolymerisation led to
STRONGER - FASTER - GREENER ... NOW IN PINK
in cooperation with
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