Coating apparatus for transparent plastic film with pigmented filter strip

PURPOSE: To stably form a pigmented filter strip by controlling respective pumps for supplying two coating materials in such a manner that an equal pressure is applied on both coating materials at all times within a mixing section of a spraying pipe of a surface scraping coating head. CONSTITUTION: The components K 1 , K 2 from pumps 8, 9 and components K' 1 , K' 2 from pumps 15, 16 are respectively supplied through mixing heads 10, 17 and secondary mixers 12, 19 to the surface scraping coating head 5. A film 2 consisting of the reactive coating material (K 1 +K 2 ) is formed on a coating material support 1. The coating film of the colored coating materials (K' 1 K" 2 ) having uniform and constant transparency and colors is formed in an end edge area 2' and the coating film of the continuously changing transparency is formed in a transition area 2". A control means 25 controls the rotation of the pumps 8, 9, 15, 16 by the signals of pressure sensors 21, 22 in such a manner that the pressures on both sides are equaled to each other in the mixing section S formed of a barrier 39 in this transition area. The coating film 2 (2', 2") after curing is peeled from the coating material support 1, by which the film is formed. COPYRIGHT: (C)1991,JPO