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EN ISO 5267-1:2000

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

Edition date: 2010-03-08
In Force
Summary: 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.

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».

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.
ICS: 85.040-Pulps
CTN: CEN/TC 172 - 6153

Correcciones Normas

Es corregida por EN ISO 5267-1:2000/AC:2002

Otras Relaciones

Adoptada de ISO 5267-1:1999

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