EP 1233105 A3 20031203 - Twin-wire former

Title (en)

Twin-wire former

Title (de)

Doppelsiebformer

Title (fr)

Section de formage à deux toiles

Publication

EP 1233105 A3 20031203 (DE)

Application

EP 02000847 A 20020115

Priority

DE 10106731 A 20010214

Abstract (en)

[origin: US2002108732A1] The invention relates to a twin wire former for the production of a fiber web specifically a paper, cardboard or tissue web, from a fiber suspension. The invention is characterized in that the rotating forming roll has an open volume and is a non-suction type; the rotating forming roll has a forming roll diameter of less than 1,400 mm; the rotating forming roll has a forming roll angle of wrap of less than 70°; a forming suction box is located immediately downstream from the rotating forming roll as viewed in direction of wire travel; and in the area of the wedge-shaped inlet nip, the fiber stock suspension has a stock density of between 0.4% and 2.0%, preferably between 0.6% and 1.5%. These characteristics result in an improved forming quality and web quality.

IPC 1-7

D21F 9/00

IPC 8 full level

D21F 9/00 (2006.01)

CPC (source: EP US)

D21F 9/003 (2013.01 - EP US)

Citation (search report)

[XDY] EP 0627523 A1 19941207 - VALMET PAPER MACHINERY INC [FI]
[Y] US 4209360 A 19800624 - STENBERG ERIK G [SE], et al
[Y] US 4619737 A 19861028 - HOLZ EMIL [DE]
[YD] WO 9747803 A1 19971218 - VALMET CORP [FI]
[A] EP 0504123 A1 19920916 - VALMET PAPER MACHINERY INC [FI]
[A] EP 0391025 A1 19901010 - ESCHER WYSS GMBH [DE]
[A] MUELLER K ET AL: "EINSATZ DER GAP-FORMIERTECHNOLOGIE BEI DER HERSTELLUNG VON TESTLINER UND WELLENPAPIEREN", PAPIER, DAS, EDUARD ROETHER KG. DARMSTADT, DE, vol. 45, no. 7, 1 July 1991 (1991-07-01), pages 347 - 354, XP000220105, ISSN: 0031-1340

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

DOCDB simple family (publication)

EP 1233105 A2 20020821; EP 1233105 A3 20031203; DE 10106731 A1 20020822; US 2002108732 A1 20020815; US 6776877 B2 20040817

DOCDB simple family (application)

EP 02000847 A 20020115; DE 10106731 A 20010214; US 7455102 A 20020213