EN ISO 5267-1:2000

Pulps - Determination of drainability - Part 1: Schopper-Riegler method (ISO 5267-1:1999)

This part of ISO 5267 specifies a method for the determination of the drainability of the drainability of a pulp suspension in water in terms of the Schopper-Riegler (SR) number. The Schopper-Riegler test is designed to provide a measure of the rate at which a dilute suspension of pulp may be dewatered. It has been shown that the drainability is related to the surface conditions and swelling of the fibres, and constitutes a useful index of the amount of mechanical treatment to which the pulp has been subjected.

Faserstoffe - Prüfung des Entwässerungsverhaltens - Teil 1: Schopper-Riegler-Verfahren (ISO 5267-1:1999)

Diese internationale Norm legt ein Verfahren zur Prüfung der Entwässerungsfähigkeit von wäßrigen Papierfaserstoff-suspensionen,
ausgedrückt in Schopper-Riegler-Einheiten (SR), fest. Das Schopper-Riegler-Verfahren liefert ein geeignetes Maß für die Entwässerungsgeschwindigkeit einer verdünnten Papierfaserstoffsuspension. Das Entwässerungsverhalten ist abhängig von der Oberflächenbeschaffenheit und dem Quellungszustand der Fasern. Der gemessene Schopper-Riegler-Wert stellt eine nützliche Kennzahl zur Beurteilung der mechanischen Behandlung der Fasern dar. Grundsätzlich ist dieses Verfahren für alle Sorten von Zellstoffen in wäßrigen Suspensionen anwendbar. In der Praxis liefert die Prüfung nach Schopper-Riegler nur dann akzeptable Ergebnisse, wenn ein genügend dichter Faserkuchen auf dem Sieb gebildet wird. Das Verfahren wird daher für einige Kurzfaserstoffe, wie hochgemahlene
Laubholzzellstoffe, nicht empfohlen, da ein großer Anteil der Fasern durch das Sieb läuft, wodurch sich der SR-Wert abnormal verringert. Die verläßlichsten Ergebnisse werden im Bereich von 10 SR bis 90 SR erhalten. Ergebnisse dieser Prüfung stimmen nicht grundsätzlich mit dem Entwässerungsverhalten von Papierfaserstoff-suspensionen auf Papiermaschinen überein. ANMERKUNG: Ein Verfahren zur Prüfung des Entwässerungsverhaltens, ausgedrückt in "Canadian Standard freeness"-Einheiten ist in ISO 5267-2 : 1980 "Pulps - Determination of drainability - Part 2: "Canadian Standard" freeness Verfahren festgelegt.

Pâtes - Détermination de l'égouttabilité - Partie 1: Schopper-Riegler (ISO 5267-1:1999)

La présente partie de l'ISO 5267 spécifie une méthode de détermination de l'égouttabilité d'une suspension aqueuse de pâte en fonction de l'indice Schopper-Riegler (SR).  L'essai Schopper-Riegler est conçu pour donner la mesure de la vitesse à laquelle l'eau peut être extraite d'une suspension de pâte diluée. Il a été démontré que l'égouttabilité est fonction de l'état de la surface et du gonflement des fibres, et qu'elle constitue un indice utile de l'importance du traitement mécanique subi par la pâte.  En principe, cette méthode est applicable à tous les types de pâtes en suspension aqueuse. En pratique, cependant, l'essai Schopper-Riegler ne donne des résultats acceptables que si un gâteau suffisamment dense de fibres est formé sur la toile. L'essai n'est donc pas recommandé pour certaines pâtes à fibres extrêmement courtes, comme les pâtes de feuillus fortement raffinées, du fait que la majeure partie des fibres passe à travers la toile, occasionnant ainsi une réduction anormale de l'indice SR. Les résultats les plus fiables sont obtenus pour des indices SR compris entre 10 et 90.  Du point de vue de l'égouttabilité, les résultats de cet essai ne correspondent pas nécessairement au comportement de la pâte sur une machine à papier industrielle.  
NOTE On donne dans l'ISO 5267-2:1980, Pâtes - Détermination de l'égouttabilité - Partie 2: Méthode freeness «Canadian Standard», une méthode pour déterminer l'égouttabilité en fonction de l'indice freeness «Canadian Standard».

Vlaknine - Določevanje odvodnjavanja - 1. del: Schopper-Rieglerjeva metoda (ISO 5267-1:1999)

General Information

• Status: Published
• Publication Date: 18-Jul-2000
• ICS: 85.040 - Pulps
• Technical Committee: CEN/TC 172 - Pulp, paper and board
• Drafting Committee: CEN/TC 172 - Pulp, paper and board
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 08-Mar-2010
• Completion Date: 08-Mar-2010
• Ref Project: SIST EN ISO 5267-1:2000 - Pulps - Determination of drainability - Part 1: Schopper-Riegler method (ISO 5267-1:1999)

Relations

• Corrected By: EN ISO 5267-1:2000/AC:2002 - Pulps - Determination of drainability - Part 1: Schopper-Riegler method (ISO 5267-1:1999/Cor.1:2001)
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2000
9ODNQLQH'RORþHYDQMHRGYRGQMDYDQMDGHO6FKRSSHU5LHJOHUMHYDPHWRGD,62

Pulps - Determination of drainability - Part 1: Schopper-Riegler method (ISO 5267-
1:1999)
Faserstoffe - Prüfung des Entwässerungsverhaltens - Teil 1: Schopper-Riegler-Verfahren
(ISO 5267-1:1999)
Pâtes - Détermination de l'égouttabilité - Partie 1: Schopper-Riegler (ISO 5267-1:1999)
Ta slovenski standard je istoveten z: EN ISO 5267-1:2000
ICS:
85.040 Vlaknine Pulps
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 5267-1
Second edition
1999-03-01
Pulps — Determination of drainability —
Part 1:
Schopper-Riegler method
Pâtes — Détermination de l'égouttabilité —
Partie 1: Méthode Schopper-Riegler
A
Reference number
ISO 5267-1:1999(E)
ISO 5267-1:1999(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 5267-1 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps,
Subcommittee SC 5, Test methods and quality specifications for pulp.
This second edition cancels and replaces the first edition (ISO 5267-1: 1979), of which it constitutes a minor
revision. The main amendment is the addition of ISO 14487 to clause 6 (formerly clause 7) to specify the water
used in the test.
ISO 5267 consists of the following parts, under the general title Pulps — Determination of drainability:
 Part 1: Schopper-Riegler method
 Part 2: “Canadian Standard” freeness method
Annexes A and B form an integral part of this part of ISO 5267.
©  ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
Printed in Switzerland
ii
INTERNATIONAL STANDARD  © ISO ISO 5267-1:1999(E)
Pulps — Determination of drainability — Part 1: Schopper-Riegler
method
1 Scope
This part of ISO 5267 specifies a method for the determination of the drainability of a pulp suspension in water in
terms of the Schopper-Riegler (SR) number.
The Schopper-Riegler test is designed to provide a measure of the rate at which a dilute suspension of pulp may be
dewatered. It has been shown that the drainability is related to the surface conditions and swelling of the fibres, and
constitutes a useful index of the amount of mechanical treatment to which the pulp has been subjected.
In principle, this method is applicable to all kinds of pulp in aqueous suspension. However, in practice, the
Schopper-Riegler test provides acceptable results only if a sufficiently dense mat of fibres is formed on the wire
screen. For this reason, the test is not recommended for some extremely short-fibred pulps, such as those from
well-beaten hardwoods, as most of the fibres will pass through the wire screen, resulting in anomalous reduction of
the SR number. The most reliable results are obtained within the range of 10 to 90 SR number.
The results of this test do not necessarily correlate with the drainage behaviour of a pulp material on a commercial
paper machine.
NOTE A method for the determination of drainability in terms of the "Canadian Standard" freeness number is specified in
ISO 5267-2:1980, Pulps — Determination of drainability — Part 2: “Canadian Standard” freeness method.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 5267. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of ISO 5267 are encouraged to investigate the possibility of applying the
most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid
International Standards.
ISO 4119:1995, Pulps — Determination of stock concentration.
ISO 14487:1997, Pulps — Standard water for physical testing.
3 Definition
For the purposes of this part of ISO 5267, the following definition applies.
3.1
Schopper-Riegler number scale
scale on which a discharge of 1 000 ml corresponds to a SR number of zero and zero discharge to a SR number of
3.2
stock
aqueous suspension of disintegrated pulp
ISO 5267-1:1999(E) © ISO
4 Principle
Draining, through a fibre mat formed during the test on a wire screen, of a given volume of pulp in aqueous
suspension into a funnel provided with a bottom and a side orifice. Collection of the discharge from the side orifice in
a measuring cylinder, graduated in Schopper-Riegler numbers.
5 Apparatus
Ordinary laboratory apparatus and
5.1  Schopper-Riegler apparatus, as described in annex A.
Instructions for maintenance of the apparatus are given in annex B.
5.2  SR measuring cylinder, graduated in Schopper-Riegler numbers.
6 Preparation of sample
Take a sample of aqueous suspension of disintegrated pulp. If the concentration is not known exactly, dilute the
suspension to a mass fraction of approximately 0,22 % with standard water in accordance with ISO 14487 (see
note 2), and determine the stock concentration (mass fraction) in accordance with ISO 4119. Then dilute the
suspension to a mass fraction of 0,2 % – 0,002 % and adjust the temperature to 20,0 °C – 0,5 °C (see note 3).
Throughout the preparation of the sample, take care to avoid the formation of air bubbles in the suspension.
With time, an aqueous pulp suspension, withdrawn from the stock preparation system or laboratory pulp evaluation
equipment, can undergo a change in Schopper-Riegler number. To avoid the effect of this reversion phenomenon,
pulp suspensions subjected to testing more than 30 min after sampling shall first be treated in the disintegration
apparatus for 6 000 revolutions of the propellor, at or near the stock concentration specified for the SR test.
NOTE 1 The test result is sensitive to the quantity of pulp fines, or “crill”, in the suspension. Thickened pulp samples may
lose some of this fibre fraction. To avoid such losses during the course of thickening, the filtrate should be recirculated through
the pulp-pad until the filtrate is clear, and the pulp redispersed by disintegrating as described in the previous paragraph. This
procedure should be used to concentrate dilute pulp suspension to the mass fraction required for the Schopper-Riegler test.
NOTE 2 As the drainage of a pulp suspension is affected considerably by dissolved solid and the pH of the water, standard
water in accordance with ISO 14487 should be used throughout the test.
NOTE 3 Where necessary for climatic reasons, a temperature of 25 °C – 5 °C may be applied, provided that this is noted in
the test report. In any case, during the test the basic temperature chosen should be kept constant within – 0,5 °C.
7 Procedure
Clean the funnel and drainage chamber of the Scho
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