EP 1088594 A3 20030827 - Method and device for spraying a moving fibrous web
Title (en)
Method and device for spraying a moving fibrous web
Title (de)
Verfahren und Vorrichtung zum Besprühen einer bewegten Faserstoffbahn
Title (fr)
Procédé et dispositif de pulvérisation d'un produit sur une nappe fibreuse en défilement
Publication
Application
Priority
DE 19946479 A 19990928
Abstract (en)
[origin: EP1088594A2] The assembly to spray the surface of a moving paper or cardboard web (12) has a jet (14) which sprays an adjustable vol. of the coating medium (16) on to the web surface. A pulsation valve (20) is in the feed of the medium to the jet, where the flow pulsations are damped or weakened. The vol. flow to the jet (14) is set by the pulsation valve (20), which is an armature or plate armature valve. The pulsations in the vol. flow of the coating medium (16) to the jet (14) are suppressed by a pulsation damper (18) in front of the jet (14) and/or by the use of a jet (14) with a larger jet width in the direction (L) of web travel and/or by the use of a flexible feed conduit to the jet (14). The jet width along the direction (L) of web travel can be 30% of the width across the web line and preferably 50% of the lateral width. The jet (14) is preferably an elliptical flat-stream jet, oriented at an angle to the web (12) to spray the surface against the direction (L) of web travel at ≤ 80 degrees and preferably ≤ 70 degrees . The jet is suitable for webs (12) moving at speeds of ≥ 1200 m/min. and preferably ≥ 1500 m/min. The jet (14) can also be a solid cone jet. The vol. flow is set by the pulsation valve (20) using pulse width modulation. The pulsation valve is controlled at a constant cycle frequency. An Independent claim is included for a web coating assembly (10) with a jet (14) to spray the web (12) surface with a coating medium (16). At least one pulsation valve (20) in the flow feed with units (18,14) to dampen or weaken pulsations in the medium flow.
IPC 1-7
IPC 8 full level
B05B 1/30 (2006.01); B05B 9/03 (2006.01); B05B 12/06 (2006.01); D21G 7/00 (2006.01); D21H 23/50 (2006.01); B05B 1/08 (2006.01)
CPC (source: EP US)
B05B 1/30 (2013.01 - EP US); B05B 9/03 (2013.01 - EP US); D21G 7/00 (2013.01 - EP US); D21H 23/50 (2013.01 - EP US); B05B 1/08 (2013.01 - EP US)
Citation (search report)
- [X] EP 0705688 A1 19960410 - ROCKWELL INTERNATIONAL CORP [US]
- [X] US 5038681 A 19910813 - HULTBERG STEN [SE], et al
- [A] US 5403617 A 19950404 - HAALAND PETER D [US]
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
DE 19946479 A1 20010329; DE 50009846 D1 20050428; EP 1088594 A2 20010404; EP 1088594 A3 20030827; EP 1088594 B1 20050323; US 6444090 B1 20020903
DOCDB simple family (application)
DE 19946479 A 19990928; DE 50009846 T 20000728; EP 00116349 A 20000728; US 67162200 A 20000928