Treating a substrate by flame or corona discharge treatment is necessary for creating strong, successful film-based structures, but over-treating polyester (PET) and polyamide (PA) films can be detrimental.
PET and PA films are delicate substrates. Treatment is necessary to produce the oxidized sites which will chemically bond to the primer, but too much treatment will break down a microscopic layer of the film surface, which will destroy the primer's performance.*
The liquid primer turns yellow or brown during a run. This means oligomers on the film have washed from the film back into the primer pan.
A waxy or oily residue builds up on the gravure cylinder during a production session.
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