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公开(公告)号：EP0906467B1
公开(公告)日：2002-10-30
申请号：EP97925594.0
申请日：1997-05-06
IPC分类号： D21F1/02
摘要： A headbox (20) has a tube bank (28) of tubes (26) arranged in machine direction rows. The tubes (26) extend from an outlet wall (30) of a header to the inlet of a nozzle (42). The upper and lower walls (44, 46) of the nozzle (42) converge toward the nozzle outlet (48), and planes extending from the walls (nozzle roof and apron) converge to define an imaginary centerline extending in the cross-machine direction. The rows of tubes (26) lie along radially extending planes defined with respect to the centerline. The injection ends of the tubes define a cylindrical surface (64) extending between the nozzle walls (44, 46). Stock from each tube (26) is directed radially toward the centerline along flow paths (47) of equal length. Trailing vanes (68) may be positioned between the rows of tubes (26) so that each flow experiences almost identical flow boundary conditions as it moves towards the nozzle outlet (48), hence contributing to more uniform fiber orientation in the resultant paper web (51).
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公开(公告)号：EP0826088B1
公开(公告)日：2001-12-12
申请号：EP96910534.5
申请日：1996-03-15
发明人： WAECH, Theodore, G.
IPC分类号： D21H23/36
CPC分类号： D21H23/36
摘要： A coater head (22) has a housing (23) which defines a coating pond (28) supplied with coating under pressure. A plurality of bars (21) extend within the coating pond (28) in the cross-machine direction, and are spaced parallel to one another in the machine direction. A paper web (36) is engaged against a backing roll (24), and travels through the coating pond (28) past a metering blade (30) which applies coating from the pond to the web. The bars (21) induce a turbulent flow which shears bubbles of air entrained in the coating pond, thereby reducing the bubble diameters and air-induced imperfections in the coating. Greater machine speed, which tends to entrain more air, induces greater shear at the bars which causes bubble size to be more greatly reduced.
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公开(公告)号：EP0906467A1
公开(公告)日：1999-04-07
申请号：EP97925594.0
申请日：1997-05-06
IPC分类号： D21F1
摘要： A headbox (20) has a tube bank (28) of tubes (26) arranged in machine direction rows. The tubes (26) extend from an outlet wall (30) of a header to the inlet of a nozzle (42). The upper and lower walls (44, 46) of the nozzle (42) converge toward the nozzle outlet (48), and planes extending from the walls (nozzle roof and apron) converge to define an imaginary centerline extending in the cross-machine direction. The rows of tubes (26) lie along radially extending planes defined with respect to the centerline. The injection ends of the tubes define a cylindrical surface (64) extending between the nozzle walls (44, 46). Stock from each tube (26) is directed radially toward the centerline along flow paths (47) of equal length. Trailing vanes (68) may be positioned between the rows of tubes (26) so that each flow experiences almost identical flow boundary conditions as it moves towards the nozzle outlet (48), hence contributing to more uniform fiber orientation in the resultant paper web (51).
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公开(公告)号：EP0826088A1
公开(公告)日：1998-03-04
申请号：EP96910534.0
申请日：1996-03-15
发明人： WAECH, Theodore, G.
CPC分类号： D21H23/36
摘要： A coater head (22) has a housing (23) which defines a coating pond (28) supplied with coating under pressure. A plurality of bars (21) extend within the coating pond (28) in the cross-machine direction, and are spaced parallel to one another in the machine direction. A paper web (36) is engaged against a backing roll (24), and travels through the coating pond (28) past a metering blade (30) which applies coating from the pond to the web. The bars (21) induce a turbulent flow which shears bubbles of air entrained in the coating pond, thereby reducing the bubble diameters and air-induced imperfections in the coating. Greater machine speed, which tends to entrain more air, induces greater shear at the bars which causes bubble size to be more greatly reduced.
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