Patent ID: 8424482

Claim:
Apparatus for coating a web-shaped material with a coating medium ( 6 ), with a rotating transfer roll ( 3 ), which comprises depressions on its circumferential surface ( 5 ) for the transfer of the coating medium ( 6 ) to the web-shaped material, with an application apparatus ( 10 ) for the filling of the depressions of the transfer roll ( 3 ) with coating medium ( 6 , 6 ′), whereby the application apparatus ( 10 ) comprises a coating chamber ( 12 ) for the coating medium ( 6 ′) and a pre-filling area for the coating medium, which coating chamber ( 12 ) and which pre-filling area are respectively bounded on a free outer side thereof by the circumferential surface ( 5 ) of the transfer roll ( 3 ), whereby a rear gap of the coating chamber between the circumferential surface ( 5 ) and the coating chamber ( 12 ) is bounded by a doctor blade ( 13 ), which lies in a sealed manner on the circumferential surface ( 5 ) of the transfer roll ( 3 ), wherein the rear gap is located on a downstream side of the coating chamber with respect to a motion direction of a rotation of the transfer roll, whereby a forward gap of the coating chamber between the circumferential surface ( 5 ) and the coating chamber is bounded by a seal element ( 2 ) , wherein the forward gap is located on an upstream side of the coating chamber with respect to the motion direction of the transfer roll, between the pre-filling area and the coating chamber, whereby the transfer roll ( 3 ) is impinged upon with coating medium ( 6 ) in the pre-filling area upstream from the seal element ( 2 ) with respect to the motion direction of the transfer roll ( 3 ), characterized in that: the coating medium ( 6 ) streams out of plural holes ( 15 , 15 ′) which are arranged in the pre-filling area distributed over the width of the transfer roll ( 3 ), whereby an open upstream side of the pre-filling area with respect to the motion direction is open and unsealed relative to the circumferential surface of the transfer roll, and the plural holes are spaced apart from one another with sufficiently large free spaces therebetween, so that the pre-filling area is open to atmospheric air which can enter the pre-filling area and so that a portion of the coating medium flows through the free spaces between the plural holes and out of the pre-filling area through the open upstream side of the pre-filling area, the plural holes ( 15 , 15 ′) are provided in a common mounting support comprising a nozzle carrier in the application apparatus, and outlet openings ( 151 ) of the plural holes ( 15 , 15 ′) are provided in equal height to each other at a height of an upper plateau surface ( 141 ) of the nozzle carrier ( 14 ).