Why doesn the film supplier treat to a higher dyne level?
Below are a few reasons a film supplier may not be able to treat the film to the high dyne level required by the converting process. • Web handling problems: Treating film to a high dyne level at the time of extrusion can cause film blocking. That is film with such high surface energy that it sticks to itself and cannot be unwound without damaging the film. • Backside Treatment: In the effort to achieve a high dyne level on one side of the film, the film wrinkles or puckers thus caus ing corona on the backside of the film where no corona treatment is wanted. • Film Limitations: Some substrates have a mild response to the corona process. Regardless of how much energy the film manufacturer applies to a given substrate, the dyne level will not exceed a given level. B.
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