Apparatus for limiting the coating edge in a short dwell coater

An apparatus for limiting a coating edge in a short dwell coater comprising:

• a backing roll having a circumferential surface for guiding a web;
• a doctor blade element abutting said backing roll and extending laterally across a width of the web;
• a barrier wall oriented parallel to said doctor blade element, said barrier wall and said doctor blade element defining an application zone therebetween for applying coating to the web;
• two means for limiting the coating edge, each of said edge limiting means comprising:
• a sealing block interposed between said barrier wall and said doctor blade;
• a sliding element operatively connected to said sealing block and interposed between said barrier wall and said doctor blade element;
• each of said coating edge limiting means being arranged in an edge region of the web and movable in a direction perpendicular to a direction of movement of the web;
• a formatting plate holder having a free end and an opposite end connected to said sealing block, said formatting plate holder extending outwardly over said barrier wall;
• and
• a thin formatting plate arranged on said formatting plate holder so as to extend over said barrier wall into a space between said barrier wall and said doctor blade element and to cover the application zone in the edge region of the web;
• an upper surface of said sealing block facing said formatting plate having at least one depression extending parallel to the direction of movement of the web and connected to a water supply by a channel;
• said formatting plate and said sealing block defining therebetween a sealing gap having a width of between 1 mm and 3 mm, the water introduced into the sealing gap through the depression producing a pressure cushion and pressing said formatting plate flatly against the web.