We are trying to screen print polyethylene banner material and aren having any luck. What do we need to do to make the paint or ink stick?
Polyethylene is almost chemically inert. Paints and inks won’t stick to the material because their solvents can’t penetrate its surface. You need to use a corona-treated polyethylene. Corona treating involves putting tiny parallel lines on the film via an electrostatic process. The inks then stick to the lines on the film.
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