EP 0664356 B1 20000705 - Process and apparatus for improving the quality of multi-layer papers
Title (en)
Process and apparatus for improving the quality of multi-layer papers
Title (de)
Verfahren und Vorrichtung zur Verbesserung der Papierqualität bei Mehrschicht-und Mehrlagenpapieren
Title (fr)
Procédé et dispositif pour améliorer la qualité des papiers à plusieurs couches
Publication
Application
Priority
DE 4401761 A 19940122
Abstract (en)
[origin: EP0664356A2] Improvement of multilayer paper quality in the wet working section of a paper machine entails at least two different quality pulps for paper strip mfr.; collection and recycling of dilute suspension drained from a screen in quite separate containers where at least most of a first pulp is drained through a first screen, corresp. for a second pulp and where the suspensions from each screen are separately gathered and reintroduced to the corresp. pulp i.e. paper layer. The appts. for the implementation comprises: appts. and pipework for gathering the separate dilute suspensions in accordance with quality levels and pipework for the re-introduction of the suspensions. Where a two-layer strip is formed by passing two pulp layers through a continuous double-sided screen, the gathering of the different dilute suspensions is carried out mainly in the screens' initial zone. In the formation of a triple layer sheet where the dilute suspension extracted from a first screen originates essentially from the outer layers it is reintroduced to them, while that from a later screen is reintroduced to the middle layer. The outer layers (S1, S3) can originate from approx. the same pulp and enclose a middle layer (S2).
IPC 1-7
IPC 8 full level
D21F 9/02 (2006.01); D21F 9/00 (2006.01); D21F 11/04 (2006.01); D21H 17/63 (2006.01)
CPC (source: EP US)
D21F 9/006 (2013.01 - EP US); D21F 11/04 (2013.01 - EP US)
Designated contracting state (EPC)
AT DE SE
DOCDB simple family (publication)
EP 0664356 A2 19950726; EP 0664356 A3 19960612; EP 0664356 B1 20000705; AT E194398 T1 20000715; CA 2140734 A1 19950723; CA 2140734 C 20060606; DE 4401761 A1 19950727; DE 4401761 C2 19970424; DE 59508521 D1 20000810; FI 111862 B 20030930; FI 950131 A0 19950111; FI 950131 A 19950723; JP H07300789 A 19951114; US 5639349 A 19970617
DOCDB simple family (application)
EP 95100234 A 19950110; AT 95100234 T 19950110; CA 2140734 A 19950120; DE 4401761 A 19940122; DE 59508521 T 19950110; FI 950131 A 19950111; JP 741895 A 19950120; US 37702695 A 19950120