Global Patent Index - EP 0824157 B1

EP 0824157 B1 2001-12-05 - Headbox and process for the distribution of a fibrous suspension in the headbox of a paper making machine

Title (en)

Headbox and process for the distribution of a fibrous suspension in the headbox of a paper making machine

Title (de)

Stoffauflauf und Verfahren zur Verteilung einer Faserstoffsuspension im Stoffauflauf einer Papiermaschine

Title (fr)

Caisse de tête et procédé pour la répartition d'une suspension fibreuse dans la caisse de tête d'une machine à papier

Publication

EP 0824157 B1 (DE)

Application

EP 97112824 A

Priority

  • DE 19632673 A
  • DE 19632672 A

Abstract (en)

[origin: EP0824157A2] In a process for distributing a suspension of fibrous material (stock) in the head box of a paper machine, different additive materials are injected into the stock at two or more different levels relative to the plane of the paper. Also claimed is a process in which different stock streams are supplied through two or more separate distributors, guiding devices, nozzles and slots in the head box. The stock supplied to form the outer (i.e. surface) layers of the paper contains: (i) fibres with a higher degree of milling; (ii) more filler or fines; or (iii) fibrous material which has been refined with a lesser amount of chemicals and has stronger fibres than the stock forming the inner layers. Further claimed is a head box in which the processes are carried out. Preferably the additives may be injected into the stock in the middle section (12), the nozzle (14), and/or the distributor (11) parts of the head box. The additives are fillers, chemicals (especially retention media), starch, suspensions of fibrous materials, or mixtures thereof. Less retention medium and/or less filler and/or fines are added to the centre of the stock flow than to the outer layers. The additives supplied to the centre of the web are those which increase strength, and those supplied to the outer layers increase printability. The concentration of the fibrous material in the stock may be adjusted in zones across the web width, whilst the volume flow rate of the suspension is kept substantially constant. Similarly, the additive streams may be adjusted in zones across the machine width and/or in the direction perpendicular to the web surface volume whilst flow rate is kept constant by the addition, as necessary, of water.

IPC 1-7 (main, further and additional classification)

D21F 1/02; D21F 1/08

IPC 8 full level (invention and additional information)

D21F 1/02 (2006.01)

CPC (invention and additional information)

D21F 1/022 (2013.01); D21F 1/02 (2013.01); D21F 1/026 (2013.01); D21F 1/028 (2013.01)

Designated contracting state (EPC)

DE FI SE

EPO simple patent family

EP 0824157 A2 19980218; EP 0824157 A3 19980401; EP 0824157 B1 20011205

INPADOC legal status


2013-09-26 [REG DE R119] APPLICATION DEEMED WITHDRAWN, OR IP RIGHT LAPSED, DUE TO NON-PAYMENT OF RENEWAL FEE

- Document: DE 59705631

- Effective date: 20130201

2013-04-30 [PG25 FI] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: FI

- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

- Effective date: 20120725

2013-04-30 [PG25 DE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: DE

- Free text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

- Effective date: 20130201

2011-11-30 [PGFP DE] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: DE

- Payment date: 20110722

- Year of fee payment: 15

2011-11-30 [PGFP FI] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: FI

- Payment date: 20110714

- Year of fee payment: 15

2002-11-27 [26N] NO OPPOSITION FILED

2002-03-05 [PG25 SE] LAPSED IN A CONTRACTING STATE ANNOUNCED VIA POSTGRANT INFORM. FROM NAT. OFFICE TO EPO

- Ref Country Code: SE

- Free text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

- Effective date: 20020305

2002-01-17 [REF] CORRESPONDS TO:

- Document: DE 59705631 20020117

2001-12-05 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE FI SE

2000-12-20 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: VOITH PAPER PATENT GMBH

2000-03-01 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20000112

1999-01-13 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: VOITH SULZER PAPIERTECHNIK PATENT GMBH

1998-12-16 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: DE FI SE

1998-12-16 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

- Designated State(s): DE FI SE

1998-06-24 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19980424

1998-06-24 [RIN1] INVENTOR (CORRECTION)

- Inventor name: RUF, WOLFGANG

1998-06-24 [RIN1] INVENTOR (CORRECTION)

- Inventor name: LOSER, HANS

1998-06-24 [RIN1] INVENTOR (CORRECTION)

- Inventor name: LEHLEITER, KLAUS

1998-06-24 [RIN1] INVENTOR (CORRECTION)

- Inventor name: BEGEMANN, ULRICH

1998-04-01 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A3

- Designated State(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

1998-02-18 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): DE FI SE