DuPont Dow Elastomers: Latest fluoropolymer additives improve blown films

The polyolefins film industry can produce better and faster films by using the latest Viton FreeFlow process additives, according to DuPont Dow Elastomers. The company says that the RC range of rapid conditioning grades is designed to enable film converters to reduce die build-up, which increases production of smoother, clearer blown films, extruded tubing and wire jacketing.

According to the company, Viton FreeFlow works by coating the inside of the die with a microscopically thin non-stick film that reduces friction at the point where resin and die meet. This allows the extrudate to flow faster and more freely, increasing throughput of smooth, clear, fracture-free blown film made from resins, blends or masterbatches on all types of processing equipment. DuPont Dow adds that the additive shifts the processing point at which ’sharkskin’ melt fractures begin when extruding polyolefin film, resulting in improved product appearance. Additional process aid benefits of Viton FreeFlow are reductions in die swell and resin particle build-up at the die exit, which minimizes any die gap problems.

While improving clarity and surface appearance, the fluoropolymer process additive has no effect on the printability and sealability of products made of linear low density polyethylene (LLDPE), high density polyethylene (HDPE) and metallocene resins. The company says that the additive has also been used successfully with many other polymers including PP, PVC, SEBS, ABS and PET. Further benefits include extended equipment life and greater flexibility in processing speeds, pressures, melt temperatures and gauge control. The fluoropolymer additive meets all European and FDA requirements for extrusion aids used in manufacturing extruded polyolefins for continuous food contact.

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