Quote Originally Posted by Hamster View Post
I used to print on PET roll material, and before the first ink roller is applied, the substrate undergoes corona treatment.
We screen print conductive ink onto polyester sheets. All of our print lines have an 'anti-static bar' to remove the static charge from the sheet prior to printing. This is probably the same as the system you are describing although for us, it is more as a handling aid than for ink adhesion.

Manual handling of polyester sheets can result in a lot of static shocks. Not so much of a problem with a web based process.