(57) This invention develops a new kind of vertical drawing curtain coating method and
apparatus, which contains three main parts: a higher uniform equal-flow distributing
coater, a vertical drawing short-curtain, a parallel rotated coating roller and moving
webs. This coating method can simultaneously coat one or more than one layer with
high uniformity, and is suitable for silver salt or non-silver salt photo-sensitive
materials production. It can use a liqud viscosity from 2 to 1,000 mPas at a coating
velocity 30 to 300 mm/in to get a coating weight from 20 to 240 ml/m2; and can avoid coating defects such as those usually found in the bead coating and
vertical free-falling curtain coating methods.
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