What are anti blocks?
Anti-blocking is a term used to describe measures to prevent film sheets to stick together. Polyolefin films tend to adhere to each other due to strong van der Waals interaction or electrostatic charges when being in close contact (adjacent layers).
What is a slipping agent?
Slip additives are products which can be added to polymers to control friction. They are added directly into the polymer during the extrusion process and migrate to the surface as the polymer cools, allowing a solid lubricating layer to form.
What is plasticizer in PVC?
Plasticizers are used to convert PVC, a rigid plastic, into a soft, flexible, and elastic material. A plasticizer that is compatible with PVC and exhibits low volatility, good permanence, and high efficiency is referred to as a primary plasticizer.
What are slip agents made of?
Traditional slips are based on unsaturated fatty acid amides, most commonly oleamide and erucamide.
What are antiblock additives?
Antiblock Additives. An antiblock additive present in the resin microscopically protrudes from the film surface. This creates asperities (i.e. “little bumps”), which help to minimize the film-to-film surface contact, increasing the distance between the two layers, thereby minimizing blocking.
How do antiblock additives affect the coefficient of friction?
Antiblock Additives. The blocking between adjacent layers results in increased friction (resistance to motion), and the addition of an antiblock generally contributes to a reduction in the film-to-film coefficient of friction (COF). COF is a measure of the relative difficulty with which one surface will slide over an adjoining surface.
What is antiblock resin?
An antiblock additive present in the resin microscopically protrudes from the film surface. This creates asperities (i.e. “little bumps”), which help to minimize the film-to-film surface contact, increasing the distance between the two layers, thereby minimizing blocking.
What is the difference between organic and inorganic anti-blocking additives?
But the organic anti-blocking additives have a lower anti-blocking ability as compared to inorganic anti-blocking additives whereas they have a better slip effect than the inorganic additives.