公开(公告)号：US5010840A

公开(公告)日：1991-04-30

申请号：US429260

申请日：1989-10-30

申请人： L. H. Busker ,  E. W. Wight

发明人： L. H. Busker ,  E. W. Wight

IPC分类号： B05C3/18 ,  B05C5/02 ,  B05C11/04 ,  B05C11/10 ,  B05D1/26 ,  D21G7/00 ,  D21H23/00 ,  D21H23/36

CPC分类号： B05C3/18 ,  B05C11/04 ,  B05C11/041 ,  B05C11/10 ,  D21H23/36

摘要： A short dwell coater apparatus is disclosed for coating a web with a coating material, the web moving contiguously with a rotating backing roll. The apparatus includes a housing which is disposed on the opposite side of the web relative to the backing roll. The housing defines a chamber is connected to a pressurized source of coating material. The chamber is exposed to the web such that the web supported by the backing roll is coated with the coating material during passage of the web past the coating chamber. Each of a first and second weir extend in a cross-machine direction such that the coating chamber is bounded by the weirs and the web moving between the weirs. The first and second weirs define respectively first and second overflow gaps. The arrangement is such that during use of the apparatus, when the web moves past the coating chamber, coating material is coated onto the web while excess coating material overflows through the first and second gaps for recirculating through the coating chamber. A resilient blade is disposed downstream relative to the second weir. The blade cooperates with the coating material coated onto the web such that the pressure exerted by the coating material on the blade is less than the pressure of the coating material within the coating chamber, so that mottling and streaking of the resultant web is inhibited while maintaining minimum pressure on the blade.