Process for the improvement of the adhesion of photographic layers to a film web by means of a corona treatment
AssigneeAgfa-Gevaert
InventorsGunther Bayer, Hans Georg Fitzky, Herbert Hoyer, Gunter Luttgens, Wolfgang Muller-Bardorff
Life of this patent
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Abstract
Corona treatment involves the continuous subjection of the film web to a steady alternating current discharge. This treatment is carried out in two consecutive stages, the corona discharge frequency f.sub.1 in the first stage being in the range f.sub.1 = 5 to 100 kHz and the corona discharge frequency f.sub.2 in the second stage being in the range f.sub.2 = 500 to 2000 kHz.
Claims5
A process for the corona treatment of a web of polyethylene coated photographic paper in which the web is subjected to alternating current corona discharge in two consecutive stages, the frequency of the corona discharge in the first stage being from 5 to 100 kHz and the frequency in the second stage being from 500 to 2000 kHz.
Dependencies are inferred from the claim text.