POLYMER FILMS | ADDITIVES
opening of rolls, especially in thin films. The company has also developed new high- performance antiblock additives for BOPE films. Kafrit says that these ‘next generation’ films are produced from PE without the need for additional polymer layers. They allow a significant reduction in thickness compared to unstretched film — from 100 to 40 microns — without loss of mechanical properties. The new additives provide the film with improved properties, including a coefficient of friction of less than 0.25 (for a 20 micron thickness) and turbidity (haze) of less than 3%. In addition, Kafrit has developed antifogging additives for PETG films. These are claimed to provide immediate good results in both cold and hot antifogging tests. Applications include sheets and films used either for agricultural purposes or for food packaging. In agriculture, the additive allows maximum penetration of light into a greenhouse by keeping the sheet transparent and preventing water from dripping from the greenhouse roof onto the plants, which can cause crops to heat and burn when sunlight passes through the water droplets that function as optical lenses. In food applications, the coating serves
mostly an aesthetic purpose, allowing the customer a better view of the product by keeping the film transparent or reducing condensation. Antifogging solutions for polyamide and
biodegradable films have also been developed. Kafrit says a new masterbatch has shown good results in layers of PA6 and/or PA copolymer 6/66. The product was developed in collaboration with a leading European polyamide manufacturer. It is approved for food applications and is used for packaging fruit and vegetables, as well as for multi-layer food packaging. A 6% addition level is required. An antifogging masterbatch for biodegradable films is also commercially available. It is suitable for a variety of biodegradable polymers and its recommended usage percentage is 10-15%.
Mineral moves HPF The Mineral Engineers, a division of Quarzwerke Group, has developed a number of mineral raw material additives for influencing various properties of plastic films and has recently undertaken studies on packaging films requiring good antiblocking and optical properties, as well as agricultural films with high requirements for high
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www.compoundingworld.com Bringing the plastics industry together. Robust research and expert data for the global plastics industry January 2020 | COMPOUNDING WORLD 35
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