Blocking is a common issue in plastic films where smooth surfaces stick together due to surface tension, pressure, or heat. This can create difficulties during processing, such as trouble in unwinding rolls, reduced productivity, and even damage to the film.

In packaging applications, blocking can also affect usability and customer experience. Antiblock masterbatch contains finely dispersed inorganic particles—such as silica or talc—that create microscopic protrusions on the film surface. These tiny irregularities reduce the contact area between layers, minimizing adhesion and allowing the films to separate easily.