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Photo Engineer
11-09-2009, 10:35 PM
Yes, it is basically the electrostatic charging method used in Xerography. A charged wire over the film with a grounding plate underneath. The film passes between the two while a corona discharge takes place through the film. The top surface facing the discharge wire is then given a tooth that allows hydrophylic coating.

This charge, if done properly, will last about 24 hours or less. I've coated within 24 hours of the charge and also in-line. Just remember that the corona discharge may appear faint, even in the dark, but is high in UV and will fog film and paper.

PE

hrst
11-09-2009, 10:42 PM
Thank you so much for this information! My idea was to use hot cathode (halogen bulb) to emit electrons and accelerate them using electric field, but what you describe is indeed just like in copier, which is quite simple. So I'll abandon the hot cathode idea, this is easier. Thanks!