Fluoropolymers are an effective aid in the extrusion of polyolefins, mainly blown films. The following article is an outline of a specific group of fluoropolymers, namely, polyvinylidene fluoride and vinylidene fluoride/hexafluoropropylene copolymers that are used as fluoropolymer process aids, their benefits and high-efficiency products for film and other applications.
Fluoropolymer Process Aids (PPAs) allow extrusion of polyolefins and other polymers. Most noteably, these are used to eliminate melt fracture in Linear Low Density Polyethylene (LLDPE) films. These delay onset of die build-up, reduce operating pressure and enable quicker transitions and start-ups, resulting in higher throughput, better surface finish, lower downtime and energy savings. PPAs allow for use of narrow die gaps to accomplish better balance of properties in film extrusion. These benefits are observed in a variety of extrusion processes such as fiber, pipe, wire and cable, and blow molding.