BS EN ISO 5264-2-2011 Pulps Laboratory beating PFI mill method《纸浆 实验室打浆 PFI碾磨法》.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 5264-2:2011Pulps Laboratory beatingPart 2: PFI mill method (ISO 5264-2:2011)BS EN ISO 5264-2:2011 BRITISH STANDARDNational forewordThis British Standard is the UK imple

2、mentation of EN ISO 5264-2:2011. It supersedes BS EN ISO 5264-2:2002,which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PAI/11, Methods of test for paper, board and pulps.A list of organizations represented on this committee can be obtained on request to

3、its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 67352 8 ICS 85.040 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard

4、was published under the authority of the Standards Policy and Strategy Committee on 30 April 2011.Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5264-2 February 2011 ICS 85.040 Supersedes EN ISO 5264-2:2002English Version Pulps

5、 - Laboratory beating - Part 2: PFI mill method (ISO 5264-2:2011) Ptes - Raffinage de laboratoire - 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

6、 bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for 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 t

7、he CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three 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 Cen

8、tre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Nor

9、way, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. 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

10、 and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5264-2:2011: EBS EN ISO 5264-2:2011 EN ISO 5264-2:2011 (E) 3 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

11、 CEN/TC 172 “Pulp, 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 t

12、he latest by August 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 th

13、e CEN/CENELEC Internal 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

14、, Lithuania, Luxembourg, 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. BS EN ISO 5264-2:2011ISO 52

15、64-2:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Principle .1 4 Apparatus and auxiliary materials.1 5 Sampling 2 6 Preparation of sample.2 7 Procedure.2 8 Test report4 Annex A (normative) PFI mill.5 Annex B (normative) Control a

16、nd maintenance of the PFI mill8 Annex C (informative) Checking the stability of the PFI mill10 Bibliography11 BS EN ISO 5264-2:2011ISO 5264-2:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodie

17、s (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,

18、 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. International Standards are drafted in accordance with the rules given in the ISO

19、/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. 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 m

20、ember bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 5264-2 was prepared by Technical Committee ISO/TC 6, Paper, board an

21、d pulps, Subcommittee SC 5, Test methods and quality specifications for pulps. This third edition cancels and replaces the second edition (ISO 5264-2:2002), which has been technically revised. With regard to ISO 5264-2:2002, the following changes have been made: a) the normative references have been

22、 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) editorial updating. ISO 5264 consists of the following parts, under the general title Pulps Laboratory beating: Part 1: Valley beater

23、method Part 2: PFI mill method BS EN ISO 5264-2:2011ISO 5264-2:2011(E) ISO 2011 All rights reserved vIntroduction 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 re

24、sults with each instrument. Although both beaters show similar trends in the effect on pulp properties, 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

25、 step in the preparation of laboratory sheets for testing the physical properties of pulps. In 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 seve

26、ral beatings of the same pulp, where the beating is carried out for different numbers of roll 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 pre

27、pared according to ISO 5269-11, ISO 5269-22or ISO 5269-33. Physical testing of the laboratory sheets is performed according to ISO 52704. BS EN ISO 5264-2:2011BS EN ISO 5264-2:2011INTERNATIONAL STANDARD ISO 5264-2:2011(E) ISO 2011 All rights reserved 1Pulps Laboratory beating Part 2: PFI mill method

28、 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 equipment. NOTE Beating is a preliminary step in testing the physical properties of pulp. In principl

29、e, 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 references The following referenced documents are indispensable for the application of this document

30、. 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 Determination of dry matter content Oven-drying method ISO 4119, Pulps Determination of stock concentratio

31、n 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 drainability Part 2: “Canadian Standard” freeness method ISO 7213, Pulps Sampling for testing

32、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 in the same direction, but at different peripheral speeds. 4 Apparatus and auxiliary materials U

33、se ordinary laboratory equipment and the following. 4.1 PFI mill, as specified in Annex A. See Annexes B and C. BS EN ISO 5264-2:2011ISO 5264-2:2011(E) 2 ISO 2011 All rights reserved4.2 Disintegrator, as specified in ISO 5263-1. 4.3 Balance, capable of weighing the sample with an accuracy of at leas

34、t 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 sufficient time for the physical properties to stabilize. The reference pulp shou

35、ld, 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 time, the reference pulp should be kept at room temperature at a relative humi

36、dity 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 strength and tear strength values might be an indication that the reference pulp i

37、s 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 accordance with ISO 7213. If the beating is done on another type of sample, report

38、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 test portion for the determination of the dry-matter content in accordance w

39、ith 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 cut pulp sheets and avoid the use of cut edges. If the sample is in the form

40、 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 essential that the pulp sample be thoroughly softened by soaking, to ensure tha

41、t 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 7.3. 7.1 Disintegration Disintegrate the initially wet portion or the soake

42、d 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 fraction of dry matter of 20 % or more shall be disintegrated for 30 000 revolu

43、tions 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. BS EN ISO 5264-2:2011ISO 5264-2:2011(E) ISO 2011 All rights reserved 3After disintegration, check visually that the pulp is completely disintegr

44、ated. 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 disintegration, drain the pulp suspension on a Bchner funne

45、l 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 a total mass of (300 5) g, corresponding to a mass fracti

46、on 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 housing. It is important that the distance screw is disengaged

47、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 beating force per unit bar length could be (1,77 0,10) N

48、/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 (20 5) C (see Note to 7.1). Transfer the test portion of p

49、ulp 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 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. WARNING When beating for a high number of revolutions,