PE , PP and other polymer films tend to stick to each other making it difficult to separate between different layers of film without causing rupture. This phenomenon is known as ‘blocking’. Anti block additives are added to the skin layer and act as a physical separator between two adjacent layers. PE , PP and other polymer films tend to stick to each other making it difficult to separate between different layers of film without causing rupture. This phenomenon is known as ‘blocking’. Anti block additives are added to the skin layer and act as a physical separator between two adjacent layers. They also increase the film’s roughness which reduces the adhesion between the two layers and cause easy opening and filling of packaging bags.