EN 25264-2:1994
(Main)Pulps - Laboratory beating - Part 2: PFI mill method (ISO 5264-2:1979)
Pulps - Laboratory beating - Part 2: PFI mill method (ISO 5264-2:1979)
Zellstoff - Labormahlung - Teil 2: PFI-Mühle-Verfahren (ISO 5264-2:1979)
Diese Internationale Norm legt ein Verfahren zur Labormahlung von Zellstoff unter Verwendung einer PFI-Mühle fest. Die Beschreibung ist auf die Desintegration und Mahlung des Stoffes, das Austragen und Verteilen der Proben sowie die Mahleinrichtung beschränkt. Das Mahlen ist eine Vorstufe beim Prüfen der physikalischen Eigenschaften von Zellstoff.
Pâtes - Raffinage de laboratoire - Partie 2: Méthode au moulin PFI (ISO 5264-2:1979)
Vlaknine - Laboratorijsko mletje - 2. del: Metoda z mlinom PFI (ISO 5264-2:1979)
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Vlaknine - Laboratorijsko mletje - 2. del: Metoda z mlinom PFI (ISO 5264-2:1979)Zellstoff - Labormahlung - Teil 2: PFI-Mühle-Verfahren (ISO 5264-2:1979)Pâtes - Raffinage de laboratoire - Partie 2: Méthode au moulin PFI (ISO 5264-2:1979)Pulps - Laboratory beating - Part 2: PFI mill method (ISO 5264-2:1979)85.040VlakninePulpsICS:Ta slovenski standard je istoveten z:EN 25264-2:1994SIST EN 25264-2:2000en01-april-2000SIST EN 25264-2:2000SLOVENSKI
STANDARD
SIST EN 25264-2:2000
SIST EN 25264-2:2000
SIST EN 25264-2:2000
SIST EN 25264-2:2000
SIST EN 25264-2:2000
International Standard 526412 , INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONWlEX&YHAPO~HAR OPrAHM3AUMR fl0 CTAH~APTkl3ALWl.ORGANISATION INTERNATIONALE DE ~ORMALISATION Pulps - Laboratory beating - Part 2 : PFI mill method P&es - Raffinage de laboratoire - Partie 2 : MGthode au moulin PFI First edition - 1979-08-15 UDC 676.1 : 542.67 Descriptors : Paper pulps, test specimen conditioning, refining, laboratory equipment. Ref l No. ISO 5264/2-1979 (E) Price based on 4 pages SIST EN 25264-2:2000
FOREWORD ISO (the International Organization for Standardization) is a worldwide federation ‘of national Standards institutes (ISO member bedies). The work of developing Interna- tional Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non- governmental, in liaison with ISO, also take patt in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 5264/2 was developed by Technical Committee ISO/TC 6, Paper, board and Pulps, and was circulated to the member bodies in December 1977. lt has been approved by the member bodies of the following countries : Belgium Iran Canada Ireland Chile Italy Czec hoslova kia Kenya Finland Mexico France Netherlands Germany, F. R. Norway Hungary Poland India Romania The member bodies of on technical grounds : 0 the following cou ntries expressed disapproval of the document South Africa, Rep. of Spain Sweden Switzerland Turkey United Kingdom USA USSR Australia New Zealand International Organkation for Standardkation, 1979 Printed in Switzerland SIST EN 25264-2:2000
INTERNATIONAL STANDARD ISO =64/2-1979 (E) Pulps - Laboratory beating - Part 2 : PFI mill method 0 Introduction lt has been agreed that the ultimate aim of standardization of laboratory beating should be to develop one test method which is internationally acceptable and which, if possible, allows the energy consumption during beating to be measured. For prac- tical reasons it has not proved possible to achieve this at pre- sent. Therefore, as an interim measure, in view of the widespread use of the following methods - Valley beater, - PFI mill, - Jokro mill, it has been decided to provide agreed guidance on the use of these equipments in Order to achieve consistency of results with each instrument. While all three methods will show a similar trend in respect of the pulp tested, the actual results cannot be correlated between different types of beater? The Position will be kept under review, and the methods will be replaced by a Single method as soon as practicable. 1 Scope This International Standard specifies a method, using a PFI mill, for the laboratory beating of pulp. The description is limited to the furnishing and beating of the stock, the withdrawal and distribution of samples, and the beating equip- ment. The beating is a preliminary step in testing the physical proper- ties of pulp. Part 1 specifies a method of laboratory beating using a Valley beater and Part 3 a method using a Jokro mill. 2 Field of application In principle, this method is applicable to all kinds of pulp. NOTE - In practice, the method may not give satisfactory results with certain extremely long-fibred pulps, such as cotton linters. 3 ISO ISO ISO 4 References 638, Pulps - Determination o f dry matter con ten t. 4119, Pulps - Determination of stock concentration. 5263, Pulps - L abora tory wet disin tegra tion. 2) Principle A measured amount of pulp of specified stock concentration is beaten between a roll with bars and a smooth beater housing, both rotating in the same direction, but at different peripheral Speeds. 5 Apparatus and auxiliary materials Ordinary laboratory equipment and 5.1 PFI mill, as described in annex A 5.2 Standard disintegrator, as described in ISO 5263. 5.3 Balance, capable of weighing the Sample to an error of less than 0,2 g. 5.4 Distilled water, or water of similar quality. NOTE - Distilled water, or water of similar quality, is particularly recommended with a view to obviating any difficulties that might arise from the use of different qualities of water by the interested Parties. 6 Preparation of Sample If the pulp is wet or air-dry, weigh out a Sample for dry matter determination in accordance with ISO 638. If the pulp is in slush form, determine the dry matter content in accordance with ISO 4119. Take an amount of the pulp corresponding to 30 + 0,5 g of oven-dry pulp (do not tut the pulp, and avoid the use of tut 1) Should one of the three methods listed become the future Standard method, that one of the methods should be Chosen which works in the most economical way and yields the highest reproducibility of results obtained in different laboratories. At present, some countries are of the opinion that the PFI mill .described in ISO 5264/2 meets these requirements best of all. 2) At present at the Stage of draft. 1 SIST EN 25264-2:2000
Iso 5264/2-1979 (EI edges). If the Sample is in the form of machine-dried sheets or flash-dried slabs, soak the pulp thoroughly in 0,5 litre of water (see 5.4) at room temperature for not less than 4 h. Tear the soaked pulp into pieces approximately 25 mm x 25 mm in size. lt is essential that the pulp be thoroughly softened by soaking, to ensure that the preliminary disintegration results in a minimal beating effect. Wet pulps may be disintegrated without soaking. 7 Procedure 7.1 Disintegration Transfer the wet-pulp Sample, and the water used for disintegration, to the disintegrator (5.2). Add water at 20 + 5 OC to give a total volume of 2 000 rt: 25 ml; the pulp concentration will then be about 1,5 % (mlm). Set the revolu- tion counter at zero. Switch the motor on and allow the disintegrator to run for a few seconds. Switch the motor off and, before the Propeller Stops, switch on again. For pulps hav- ing an initial dry matter content of 20 % (mlm) or more, have the Propeller make 30 000 revolutions. For pulps having an in- itial dry matter content of less than 20 % (mlm), allow the pro- peller to make 10 000 revolutions. When the Propeller has stopped, completely disintegrated. NOTES check that the pulp has 1 Where necessary for climatic reasons, a temperature of 25 may be applied, provided that this is noted in the test report. * 5OC 2 Ensure that the pulp is completely disintegrated. Pulps that are dif- ficult to disintegrate, such as unbleached sulphate pulps, may require a time longer than that specified above. 7.2 Thickening to a temperature of 20 + 5 OC (sec note 1 to 7.1). Transfer the pulp Suspension, prepared in accordance with 7.2, to the beater housing, and distribute it as evenly as possible over the Wall. Ensure that no pulp remains on the bottom of the beater housing within an area corresponding to the Cross-section of the roll. Insert the roll in the beater housing, and press the cover correctly into Position in the housing. Set the beater housing in rotation, so that the pulp is flung against the housing, and then Start the roll. When both elements of the beater have attained full Speed, apply the re- quired beating pressure, and simultaneo
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