EP 0251778 B1 19910502 - METHOD AND APPARATUS FOR REMOVING WATER FROM A FIBROUS WEB IN A PAPERMACHINE
Title (en)
METHOD AND APPARATUS FOR REMOVING WATER FROM A FIBROUS WEB IN A PAPERMACHINE
Publication
Application
Priority
FI 862808 A 19860702
Abstract (en)
[origin: EP0251778A1] The present invention relates to a method and apparatus for removing water from a fibrous web. The invention is intended especially for applications to be used in a twin wire former of a paper or a board machine. A problem earlier experienced in foudrinier machines has been fiber flocking in the web surface, which results from a Iong and tranquil period of flowing, during which period fibers have enough time to stick to one another and form flocks that deteriorate the paper quality. This problem has been solved by arranging rows of dewatering pressure elements (24, 32, 33) as part of the covers (25, 34, 33) of both upper and lower dewateri::g units (20, 30) so as to match or be aligned at least partly, whereby they generate an intensive turbulence field into the web surface to break the flocks that have already been formed.
IPC 1-7
IPC 8 full level
D21F 1/48 (2006.01); D21F 3/00 (2006.01); D21F 9/00 (2006.01); D21F 9/02 (2006.01)
CPC (source: EP KR)
D21F 1/48 (2013.01 - EP KR); D21F 3/00 (2013.01 - KR); D21F 9/003 (2013.01 - EP)
Designated contracting state (EPC)
AT DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0251778 A1 19880107; EP 0251778 B1 19910502; AT E63145 T1 19910515; BR 8703365 A 19880315; DE 3769710 D1 19910606; ES 2022356 B3 19911201; FI 862808 A0 19860702; FI 862808 A 19880103; JP H01118690 A 19890511; JP H0444038 B2 19920720; KR 880001887 A 19880427; KR 900002102 B1 19900402
DOCDB simple family (application)
EP 87305818 A 19870701; AT 87305818 T 19870701; BR 8703365 A 19870702; DE 3769710 T 19870701; ES 87305818 T 19870701; FI 862808 A 19860702; JP 16411087 A 19870702; KR 870007039 A 19870702