Global Patent Index - EP 1096063 A1

EP 1096063 A1 2001-05-02 - Method and device for fractionating a paper fibre suspension

Title (en)

Method and device for fractionating a paper fibre suspension

Title (de)

Verfahren und Vorrichtung zum Fraktionieren einer papierfaserhaltigen Suspension

Title (fr)

Procédé et dispositif de fractionnement d'une suspension de fibres à papier

Publication

EP 1096063 A1 (DE)

Application

EP 00121414 A

Priority

DE 19951711 A

Abstract (en)

To divide a suspension (S) of paper fibers into fractions, especially a suspension of used paper fibers, a sieve (1) separates it into two fractions, such as according to fiber length. A parallel flow (4) is generated by a sweeper (5) with a rough surface, so that the suspension (S) is dragged through by the sweeper (5) with virtually no slip. In a contact zone of up to 1 mm from the sweeper (5), the suspension is moved at a speed of at least 90% of the sweeper (5) speed. The sweeper (5) is moved along the line of the sieve (1), with a gap (A) between the sweeper (5) and the flow side of the sieve (1) of max. 20 mm. The sweeper (5) movement speed is at least 10 m/sec. in relation to the sieve or 20 m/sec. The sweeper (5) exerts little or no pressure or suction pulses towards the surface of the sieve (1). The surface (8) of the sweeper (5) carries a number of longitudinal recesses and pref. grooves (7), or it has a felt covering over the surface (8) which has high absorbency. The openings (6) in the sieve (1) are longitudinal, to separate a fiber fraction, set at an angle of 70-110 degrees to the direction of sweeper (5) movement. Spaced eddies are formed through projections or recesses at the sieve (1), working with the parallel flow (4). An Independent claim is included for an appts. to separate a paper fiber suspension into fractions, where the sweeper (5) has a roughened surface (8). Preferred Features: The grooves (7) at the surface (8) of the sweeper (5) have a height of max. 3 mm, at intervals of max. 3 mm. The projections or recesses at the sieve (1) have a max. height/depth of 2 mm. The sieve (1) is a cylinder, with an inner rotor as the sweeper (5), concentric to each other.

Abstract (de)

Das Verfahren dient zum Fraktionieren einer papierfaserhaltigen Suspension, insbesondere einer Altpapiersuspension. Die Suspension (S) wird durch ein Sieb (1) in zwei Fraktionen aufgeteilt, wobei beispielsweise eine Aufteilung der enthaltenen Papierfasern gemäß ihrer Länge angestrebt wird. Erfindungsgemäß wird eine Parallelströmung (4) mit Hilfe eines Räumers (5) erzeugt, der mit einer rauhen Oberfläche versehen ist, so dass die Suspension (S) vom Räumer (5) nahezu schlupffrei mitgeschleppt wird. Es werden ferner besonders geeignete Vorrichtungen zur Durchführung des Verfahrens gezeigt. <IMAGE>

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

D21D 5/02

IPC 8 full level (invention and additional information)

D21D 5/02 (2006.01)

CPC (invention and additional information)

D21D 5/026 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT DE FI FR GB SE

EPO simple patent family

EP 1096063 A1 20010502; EP 1096063 B1 20040811; AT 273415 T 20040815; CA 2324338 A1 20010427; DE 19951711 A1 20010503; US 6409023 B1 20020625

INPADOC legal status


2006-08-01 [REG SE ECNC] EUROPEAN PATENT HAS BEEN CANCELLED

2006-03-29 [27W] REVOKED

- Effective date: 20051106

2006-03-29 [GBPR] GB: PATENT REVOKED UNDER ART. 102 OF THE EP CONVENTION DESIGNATING THE UK AS CONTRACTING STATE

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2005-08-03 [R26] OPPOSITION FILED (CORRECTION)

- Opponent name: ADVANCED FIBER TECHNOLOGIES (AFT) OY

- Effective date: 20050509

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2005-03-11 [ET] FR: TRANSLATION FILED

2004-10-26 [REG SE TRGR] TRANSLATION OF GRANTED EP PATENT

2004-09-16 [REF] CORRESPONDS TO:

- Document: DE 50007359 P 20040916

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