In laboratory tests, Tosaf compared the processing properties of a metallocene PE-LLD with those of compounds based on it. One of these contained Tosaf's standard fluoroelastomer-based processing aid (AP5645PE EU), while the comparison materials contained the alternative PFAS-free products. The results for the flow behaviour in the capillary rheometer and for the pressure reduction in the extruder die were largely consistent. The comparison of the optical properties – light transmission, haze and clarity – even showed slight advantages of the PFAS-free solutions over both the pure PE-LLD and the compound with the previous standard processing aid. The coefficient of friction (COF) showed a negligibly lower value for the film produced with the PFAS-free solution.
Current customer applications include a 5-layer coex-line using 1 % of Tosaf's PFAS-free processing aid AP9709PE EUin the outer layer. Compared to a standard PFAS-based processing aid, this enables a 5°C to 10°C lower melt temperature and shows a significant lower occurrence of melt fracture as well as improved optical properties such as haze. The films can be printed, sealed and laminated without any problems.
As Tosaf's Chief Innovation Scientist Dr Evgeni Zelikman comments: "This and other customer data for single and multilayer film extrusion consistently confirm the results of our extensive laboratory testing. Tosaf has once again demonstrated that its expertise, combined with its state-of-the-art research, development and testing facilities, can deliver solutions that the market is looking for, but which were previously considered unthinkable. Another particularly important factor for us is the problem-free behaviour of PFAS-free mono-material PE films in recycling. Our application engineers support manufacturers worldwide in optimising their production processes for the use of these alternative solutions."
