1、May 2011 Translation by DIN-Sprachendienst.English price group 11No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 85
2、.040!$p_n“1776075www.din.deDDIN EN ISO 5264-2Pulps Laboratory beating Part 2: PFI mill method (ISO 5264-2:2011)English translation of DIN EN ISO 5264-2:2011-05Faserstoff Labormahlung Teil 2: PFI-Mhle-Verfahren (ISO 5264-2:2011)Englische bersetzung von DIN EN ISO 5264-2:2011-05Ptes Raffinage de labor
3、atoire Partie 2: Mthode au moulin PFI (ISO 5264-2:2011)Traduction anglaise de DIN EN ISO 5264-2:2011-05SupersedesDIN EN ISO 5264-2:2003-06www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1904.11 DIN EN ISO 5264-2:2011-05 2 A comma i
4、s used as the decimal marker. National foreword This standard has been prepared by Technical Committee ISO/TC 6 “Paper, board and pulps”, Subcommittee SC 5 “Test methods and quality specifications for pulps” in collaboration with Technical Committee CEN/TC 172 “Pulp, paper and board” (Secretariat: D
5、IN, Germany). The responsible German body involved in its preparation was the Normenausschuss Papier, Pappe und Faserstoff (Paper, Board and Pulps Standards Committee), Working Committee NA 074-02-01 AA Chemisch-technische Prfverfahren fr Papier, Pappe, Faserstoff und Chemiezellstoff. The DIN Standa
6、rds corresponding to the International Standards referred to in this document are as follows: ISO 638 DIN EN ISO 638 ISO 4119 DIN EN ISO 4119 ISO 5263-1 DIN EN ISO 5263-1 ISO 5267-1 DIN EN ISO 5267-1 ISO 7213 DIN EN 27213 Amendments This standard differs from DIN EN ISO 5264-2:2003-06 as follows: a)
7、 normative references have been updated; b) a more precise description of the PFI mill has been given in Annex A; c) a new reference pulp for internal control beating has been added to Annex C; d) slight editorial improvements have been made to the German edition; e) ISO 5264-2:2011 has been adopted
8、 as European Standard without any modification. Previous editions DIN EN 25264-2: 1994-06 DIN EN ISO 5264-2: 2003-06 DIN EN ISO 5264-2:2011-05 3 National Annex NA (informative) Bibliography DIN EN ISO 638:2009-01, Paper, board and pulps Determination of dry matter content Oven-drying method DIN EN I
9、SO 4119:1996-05, Pulps Determination of stock concentration DIN EN ISO 5263-1:2004-12, Pulps Laboratory wet disintegration Part 1: Disintegration of chemical pulps DIN EN ISO 5267-1:2000-10, Pulps Determination of drainability Part 1: Schopper-Riegler method DIN EN 27213:1993-11, Pulps Sampling for
10、testing DIN EN ISO 5264-2:2011-05 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5264-2 February 2011 ICS 85.040 Supersedes EN ISO 5264-2:2002English Version Pulps - Laboratory beating - Part 2: PFI mill method (ISO 5264-2:2011) Ptes - Raffinage de labora
11、toire - Partie 2: Mthode au moulin PFI (ISO 5264-2:2011) Faserstoff - Labormahlung - Teil 2: PFI-Mhle-Verfahren (ISO 5264-2:2011) This European Standard was approved by CEN on 15 January 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions fo
12、r giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in thre
13、e official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bod
14、ies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Ki
15、ngdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5264-2:2011:
16、EContents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Principle5 4 Apparatus and auxiliary materials .5 5 Sampling.6 6 Preparation of sample .6 7 Procedure .6 8 Test report 8 Annex A (normative) PFI mill .9 Annex B (normative) Control and maintenance of the PFI mill12 Annex C
17、 (informative) Checking the stability of the PFI mill 14 Bibliography 15 EN ISO 5264-2:2011 (E) DIN EN ISO 5264-2:2011-05 2 Foreword This document (EN ISO 5264-2:2011) has been prepared by Technical Committee ISO/TC 6 “Paper, board and pulps” in collaboration with Technical Committee CEN/TC 172 “Pul
18、p, paper and board” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2011, and conflicting national standards shall be withdrawn at the latest by Aug
19、ust 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 5264-2:2002. According to the CEN/CENELEC In
20、ternal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lux
21、embourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 5264-2:2011 has been approved by CEN as a EN ISO 5264-2:2011 without any modification. EN ISO 5264-2:2011 (E) DIN EN ISO 5264-2:20
22、11-05 3 Introduction In view of the widespread use of the following beaters: Valley beater, PFI mill, it has been decided to provide guidance on the use of these beaters in order to achieve consistency of results with each instrument. Although both beaters show similar trends in the effect on pulp p
23、roperties, there is no correlation between the actual results obtained with the different types of beaters. ISO 5264-1 specifies a method of laboratory beating using a Valley beater. Beating is a preliminary step in the preparation of laboratory sheets for testing the physical properties of pulps. I
24、n the PFI mill, each beating is performed separately, i.e. a new test portion of unbeaten pulp is taken for each beating. NOTE A complete test of physical properties normally comprises unbeaten pulp and several beatings of the same pulp, where the beating is carried out for different numbers of roll
25、 revolutions. The number of roll revolutions depends on the type of pulp and the beating load. After beating, the drainability is measured according to ISO 5267-1 or ISO 5267-2, and laboratory sheets are prepared according to ISO 5269-11, ISO 5269-22or ISO 5269-33. Physical testing of the laboratory
26、 sheets is performed according to ISO 52704. EN ISO 5264-2:2011 (E) DIN EN ISO 5264-2:2011-05 4 1 Scope This part of ISO 5264 specifies a method for the laboratory beating of pulp using a PFI mill. The description is limited to the sampling, preparation and beating of the pulp and the beating equipm
27、ent. NOTE Beating is a preliminary step in testing the physical properties of pulp. In principle, this method is applicable to all kinds of chemical and semi-chemical pulps. In practice, the method might not give satisfactory results with certain pulps having extremely long fibres. 2 Normative refer
28、ences The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 638, Paper, board and pulps Determinati
29、on of dry matter content Oven-drying method ISO 4119, Pulps Determination of stock concentration ISO 5263-1, Pulps Laboratory wet disintegration Part 1: Disintegration of chemical pulps ISO 5267-1, Pulps Determination of drainability Part 1: Schopper-Riegler method ISO 5267-2, Pulps Determination of
30、 drainability Part 2: “Canadian Standard” freeness method ISO 7213, Pulps Sampling for testing ISO 14487, Pulps Standard water for physical testing 3 Principle A measured amount of pulp at a specified stock concentration is beaten between a roll with bars and a smooth beater housing, both rotating i
31、n the same direction, but at different peripheral speeds. 4 Apparatus and auxiliary materials Use ordinary laboratory equipment and the following. 4.1 PFI mill, as specified in Annex A. See Annexes B and C. EN ISO 5264-2:2011 (E) DIN EN ISO 5264-2:2011-05 5 4.2 Disintegrator, as specified in ISO 526
32、3-1. 4.3 Balance, capable of weighing the sample with an accuracy of at least 0,2 g. 4.4 Standard water, purified to have an electrical conductivity u 0,25 mS/m at 25 C, as specified in ISO 14487. 4.5 A reference pulp, as described in Annex C, kept for beating-control purposes and stored for a suffi
33、cient time for the physical properties to stabilize. The reference pulp should, if possible, be of the same grade as that normally beaten in the beating equipment concerned. Since some pulp grades are not stable, it might be necessary to choose another grade. To minimize a change in the pulp over ti
34、me, the reference pulp should be kept at room temperature at a relative humidity range of 40 % to 60 % in a dark and dust-free place. NOTE Stored under the recommended conditions, the reference pulp will, in most cases, be stable for approximately 10 years. Changes in the level of the tensile streng
35、th and tear strength values might be an indication that the reference pulp is no longer stable. The stability can be checked by measuring the viscosity of the reference pulp, e.g. twice a year. 5 Sampling If the beating is being done to evaluate a lot of pulp, the sample shall be selected in accorda
36、nce with ISO 7213. If the beating is done on another type of sample, report the source of the sample and, if possible, the sampling procedure used. Select the test portions so that they are representative of the gross sample received. 6 Preparation of sample If the sample is wet or air-dry, weigh a
37、test portion for the determination of the dry-matter content in accordance with ISO 638. If the sample is in the form of an aqueous pulp suspension, determine the dry-matter content in accordance with ISO 4119. Take a test portion of the sample corresponding to (30,0 0,5) g of oven-dry pulp. Do not
38、cut pulp sheets and avoid the use of cut 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 standard water (4.4) at room temperature for at least 4 h. Tear the soaked pulp into pieces approximately 25 mm 25 mm in size. It is ess
39、ential that the pulp sample be thoroughly softened by soaking, to ensure that the preliminary disintegration leads to only a minimal beating effect. Wet pulps may be disintegrated without soaking. 7 Procedure For each test portion (each degree of beating), carry out the procedure described in 7.1 to
40、 7.3. 7.1 Disintegration Disintegrate the initially wet portion or the soaked test portion as described in ISO 5263-1. Use standard water (4.4) at (20 5) C to give a total volume of (2 000 25) ml. The mass fraction in the disintegrator (4.2) will then be about 1,5 %. Pulps having an initial mass fra
41、ction of dry matter of 20 % or more shall be disintegrated for 30 000 revolutions of the propeller, whereas pulps having an initial mass fraction of dry matter of 20 % shall be disintegrated for 10 000 revolutions of the propeller. EN ISO 5264-2:2011 (E) DIN EN ISO 5264-2:2011-05 6 After disintegrat
42、ion, check visually that the pulp is completely disintegrated. If not, continue the disintegration until complete separation of fibres is achieved. NOTE A temperature outside the range (20 5) C can be used for climatic reasons, provided that this is stated in the test report. 7.2 Thickening After di
43、sintegration, drain the pulp suspension on a Bchner funnel or other suitable device to a mass fraction between 11 % and 20 %. To avoid any loss of fibres, refilter the filtrate through the fibre mat, if necessary several times. Using a balance, dilute the thickened pulp with standard water (4.4) to
44、a total mass of (300 5) g, corresponding to a mass fraction of 10 % stock. 7.3 Beating 7.3.1 Beating conditions Check that the beating conditions are correct (see A.2). The beating force per unit bar length shall be (3,33 0,10) N/mm, assuming that only one bar at a time makes contact with the housin
45、g. It is important that the distance screw is disengaged during beating, i.e. no fixed gap shall be used. Experience has shown that, for some pulps, a lower beating force per unit bar length may be needed to be able to evaluate the physical properties of the pulp in a correct way. In such cases, the
46、 beating force per unit bar length could be (1,77 0,10) N/mm. This deviation from the standard procedure should be reported. 7.3.2 Beating procedure Bring the beating elements of the PFI mill (4.1) and the thickened test portion of pulp, prepared in accordance with 7.1 and 7.2, to a temperature of (
47、20 5) C (see Note to 7.1). Transfer the test portion of pulp to the beater housing, and distribute it as evenly as possible over the wall. A uniform band of pulp will ensure a smooth start-up, thus reducing unnecessary vibrations and attaining a more stable beating. Ensure that no pulp remains on th
48、e 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. WARNING When beating for a high number of revolutions, the temperature of the beating elements may increase
49、. If necessary, cool the beating elements with water to bring the temperature within the specified range before the next beating. The temperature can be measured with an infrared (IR) thermometer or similar. Set the beater housing in rotation so that the pulp is slung against the wall and start the roll motor. When both beating elements have attained full speed, apply the required beating force per unit bar length. Apply the beating load at a constant rate over a period of 2 s. At the in
