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Multilayer Film Extrusion
Optical clarity. Applied to multilayer films that need to stay clear.
Using multilayer blown or cast film for applications like meat barrier packaging can lead to unacceptable defects affecting how clear it is. This can be down to the different layer thicknesses and type of polymer resins, with varying rheologies and functionalities, meeting at conflicting rates. This velocity gradient can cause turbulence at the interface, disrupting the optical clarity. This phenomenon, known as interfacial instability, can be solved by adding PPA to the formulation. Our technical support teams will help determine exactly what you need.
Blown Film
High performance polyolefins such as LLDPE and mLLDPE deliver exceptional film characteristics, but they are prone to process problems including melt fracture (or “sharkskin”), die build-up, gel formation, bubble instability, and surface defects.
3M Dyneon Polymer Processing Additives resolve all these issues, and can be added in several layers of the film. To the right are just some of the possible usages – contact our technical service to find your best fit.
Products for Blown Film
Cast Film
Cast film processing typically requires higher processing temperatures and/or shear rates. The result can be die build-up and film defects that cause excessive machine down-time.
Adding small amounts of FX 9613 or FX 5917, typically at lower loadings than those used for blown film, will delay the onset of deposition at the die exit. Levels of 300 ppm or lower can deliver a significant up-turn in production.
In special applications such as breathable film, with high loadings of inorganic fillers, there can be a rapid deposit formation at the die lip, as well as a higher torque loading, which can affect product quality and output. In this case, the most suitable PPA is FX 5911, at up to 1000 ppm.
Products for Cast Film
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