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Polyolefin and other plastic films have a tendency to adhere together, often making it difficult to separate layers. This adhesion between film layers, called blocking, is an inherent property of some polymers. Antiblocking additives can be added to the plastic to minimise this adhesion and so lower the blocking force between layers. Once compounded into a plastic these additives create a microrough surface which reduces the adhesion between film layers and lowers the blocking tendancy.
http://www.wellsplastics.com/httdocs/antiblocks.html
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