Blocking is the adhesion of two adjacent film layers which occurs due to the presence of Van der Waal’s forces between the amorphous regions of the polymer or presence of low molecular weight species which tend to migrate to the surface of the film. Anti blocking agents are added to the polyolefins to combat these issues. Anti blocks present in the resin microscopically protrudes from the film surface. This creates asperities or microscopic roughening which help to minimize the film-to-film surface contact, increasing the distance between the two layers, thereby minimizing blocking.

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