EP 0060878 B1 19850605 - A METHOD OF DEWATERING A WEB IN THE PRESS SECTION OF A PAPER MACHINE
Title (en)
A METHOD OF DEWATERING A WEB IN THE PRESS SECTION OF A PAPER MACHINE
Publication
Application
Priority
FI 803021 A 19800925
Abstract (en)
[origin: WO8201203A1] A procedure in the press section of a paper machine both with a view to improving the paper technology characteristics of the paper web (W) being manufactured and to boosting the dewatering action and improving the runability of the paper machine. The press section comprises three or more consecutive press nips (N), between which the web (W) to be treated passes in closed conduction. The first nip (N<u1>u) is defined between a water-receiving roll (2a) and a suction roll (2b). The second nip (N<u2>u) is defined between said suction roll (2b) and a smooth-surfaced roll (2c). The smooth-surfaced roll (2c) serves as one of two rolls in the next nip or nips (N<u3>u). On the web (W) from both sides thereof is directed a heating effect. With a first set of means (60) a heating effect is directed from the first side of the web in the interval between the first and second nips (N<u1>u, N<u2>u). A second heating effect is directed from the second side of the web (W) in the interval of the second and third nips (N<u2>u, N<u3>u) on a substantially extensive sector (//c) of said roll (2c). The heating effects are such of their power that the temperature of the web rises before the last nip (N<u1>u) of the closed press section substantially above 50`C, but the last-mentioned temperature still remains below about 95`C.
IPC 1-7
IPC 8 full level
D21F 3/04 (2006.01)
CPC (source: EP)
D21F 3/04 (2013.01)
Designated contracting state (EPC)
AT DE FR GB SE
DOCDB simple family (publication)
WO 8201203 A1 19820415; CA 1170883 A 19840717; EP 0060878 A1 19820929; EP 0060878 B1 19850605; ES 505752 A0 19830101; ES 8302147 A1 19830101; FI 803021 A 19820326; IT 1138640 B 19860917; IT 8124168 A0 19810925
DOCDB simple family (application)
FI 8100074 W 19810922; CA 386347 A 19810921; EP 81902752 A 19810922; ES 505752 A 19810924; FI 803021 A 19800925; IT 2416881 A 19810925