Anti Blocking

Blocking is a common problem encountered by manufactures of polyolefin films and it is discribe as the adhesion of two adjacent film layers occurs due to the presence of Van der Waal's force between the amorphous regions of the polymer. These forces increase with reduced distance between the two layers, thereby increasing blocking when two layers are pressed together (e.g. winding onto a takeup roll of stacking of finished, converted films). Another possible reason for blocking is the presence of low molecular weight species (such as oligomers), which tend to migrate to the surface of the film.

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