EN ISO 5263-2-2004 en Pulps - Laboratory wet disintegration - Part 2 Disintegration of mechanical pulps at 20 degrees C《纸浆 实验室湿态分解 第2部分 20℃时机械纸浆的分解［代替 CEN EN ISO 5263］》.pdf

《EN ISO 5263-2-2004 en Pulps - Laboratory wet disintegration - Part 2 Disintegration of mechanical pulps at 20 degrees C《纸浆 实验室湿态分解 第2部分 20℃时机械纸浆的分解［代替 CEN EN ISO 5263］》.pdf》由会员分享，可在线阅读，更多相关《EN ISO 5263-2-2004 en Pulps - Laboratory wet disintegration - Part 2 Disintegration of mechanical pulps at 20 degrees C《纸浆 实验室湿态分解 第2部分 20℃时机械纸浆的分解［代替 CEN EN ISO 5263］》.pdf（16页珍藏版）》请在麦多课文档分享上搜索。

1、BRITISH STANDARDBS EN ISO 5263-2:2004Pulps Laboratory wet disintegration Part 2: Disintegration of mechanical pulps at 20 CThe European Standard EN ISO 5263-2:2004 has the status of a British StandardICS 85.040g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g

2、50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 5263-2:2004This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 March 2007 BSI 2007ISBN 978 0 580 50418 1National forewordTh

3、is British Standard was published by BSI. It is the UK implementation of EN ISO 5263-2:2004. This standard, together with BS EN ISO 5263-1 and BS EN ISO 5263-3, supersedes BS EN ISO 5263:1997, which will be withdrawn on publication of these standards.The UK participation in its preparation was entru

4、sted to Technical Committee PAI/11, Methods of test for paper, board and pulps.A list of organizations represented on PAI/11 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct appl

5、ication.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 5263-2September 2004ICS 85.040 Supersedes EN ISO 5263:1997 English versionPulps - Laboratory wet di

6、sintegration - Part 2: Disintegration ofmechanical pulps at 20 degrees C (ISO 5263-2:2004)Ptes - Dsintgration humide en laboratoire - Partie 2:Dsintgration des ptes mcaniques 20 degrs C (ISO5263-2:2004)This European Standard was approved by CEN on 2 August 2004.CEN members are bound to comply with t

7、he CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or

8、 to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions

9、.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland

10、and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 5263

11、-2:2004: EForeword This document (EN ISO 5263-2:2004) has been prepared by Technical Committee ISO/TC 6 “Paper, board and pulps“ in collaboration with Technical Committee CEN/TC 172 “Pulp, paper and board“, the secretariat of which is held by DIN. This European Standard shall be given the status of

12、a national standard, either by publication of an identical text or by endorsement, at the latest by March 2005, and conflicting national standards shall be withdrawn at the latest by March 2005. This document supersedes EN ISO 5263 :1997. According to the CEN/CENELEC Internal Regulations, the nation

13、al standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Port

14、ugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 5263-2:2004 has been approved by CEN as EN ISO 5263-2:2004 without any modifications. EN ISO 5263-2:2004Reference numberISO 5263-2:2004(E)INTERNATIONAL STANDARD ISO5263-2First edition2004-09-0

15、1Pulps Laboratory wet disintegration Part 2: Disintegration of mechanical pulps at 20 C Ptes Dsintgration humide en laboratoire Partie 2: Dsintgration des ptes mcaniques 20 C EN ISO 5263-2:2004ii iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Definition 1 4 Apparatus. 2 5 Prepar

16、ation of test portion. 2 6 Procedure. 3 7 Test report 3 Annex A (normative) Construction of the Standard disintegration 4 Annex B (normative) Checking the Standard disintegrator. 6 EN ISO 5263-2:2004iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of nat

17、ional 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. Interna

18、tional 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. International Standards are drafted in accordance with the r

19、ules given in the ISO/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 a

20、t least 75 % of the member 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 5263-2 was prepared by Technical Committee ISO/

21、TC 6, Paper, board and pulps, Subcommittee SC 5, Test methods and quality specifications for pulps. This first edition cancels and partially replaces ISO 5263:1995 which has been technically revised. In the revision, ISO 5263 has been divided into three parts; Part 1 which is applicable to chemical

22、pulps, Part 2 which is applicable to mechanical pulps without latency and Part 3 which is applicable to mechanical pulps exhibiting latency. In Part 3, an informative Annex has been inserted describing the effect of latency in mechanical pulps. ISO 5263 consists of the following parts, under the gen

23、eral title Pulps Laboratory wet disintegration: Part 1: Disintegration of chemical pulps Part 2: Disintegration of mechanical pulps at 20 C Part 3: Disintegration of mechanical pulps at W 85 C EN ISO 5263-2:20041Pulps Laboratory wet disintegration Part 2: Disintegration of mechanical pulps at 20 C 1

24、 Scope This part of ISO 5263 specifies an apparatus and the procedures for the laboratory-wet disintegration of mechanical pulps that do not exhibit latency or mechanical pulps where latency has already been removed. This apparatus and procedure are required for preparation of the test portion in a

25、number of other International Standards dealing with pulps. In principle, this method is applicable to all kind of mechanical pulps (i.e. mechanical, semi-chemical and chemi-mechanical pulps) that do not exhibit latency, including recovered fibres from mechanical pulps. It is not suitable for mechan

26、ical pulps exhibiting latency for which the disintegration procedure described in ISO 5263-3 shall be used. The procedure specified by ISO 5263-2 should also be used to disintegrate all mechanical pulps to be measured for brightness. NOTE Brightness is not significantly altered by the presence of la

27、tency; however, hot disintegration of mechanical pulps can lead to significant loss of brightness. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the lates

28、t edition of the referenced document (including any amendments) applies. ISO 638, Pulps Determination of dry matter content ISO 4119, Pulps Determination of stock concentration ISO 14487, Pulps Standard water for physical testing 3 Definition For the purposes of this part of ISO 5263, the following

29、definitions apply. 3.1 disintegration of mechanical pulp mechanical treatment in water so that interlaced fibres, which were free in the pulp stock, are again separated from one another without appreciably changing their structural properties EN ISO 5263-2:20042 3.2 latency condition of a mechanical

30、 pulp in which some of its properties are inhibited and require disintegration of the pulp at elevated temperature to be developed NOTE 1 Latency is due to the distorted form of the fibres, acquired in mechanical processing, especially at high consistency, and subsequently preserved upon cooling at

31、high consistency. It is assumed that its preservation is caused by the hardening of the lignin. NOTE 2 The degree of latency in a pulp is generally related to the consistency and energy applied during the mechanical processing. 3.3 latency removal procedure using a combination of mechanical treatmen

32、t and heat treatment, i.e. disintegration at a temperature exceeding the softening temperature of lignin NOTE The procedure for latency removal is described in ISO 5263-3. 4 Apparatus Ordinary laboratory apparatus and the following: 4.1 Standard disintegrator, as described in Annex A. NOTE The proce

33、dure for checking the Standard disintegrator is given in Annex B. 4.2 Balance, capable of weighing with an accuracy of 0,2 g. 4.3 Standard water, for physical testing, as specified in ISO 14487. 5 Preparation of test portion If the pulp is wet or air-dry, determine the dry matter content in accordan

34、ce with ISO 638. If the pulp is in slush form, determine the dry matter content in accordance with ISO 4119. If the concentration of a slush pulp sample is less than 1,5 % by mass, thicken it to the appropriate volume, carefully avoiding the loss of fines. This is most easily done by sedimentation o

35、f the suspension and removing a part of the water phase or by dewatering through a filter paper on a Bchner funnel. Use standard water (4.3) for disintegrating pulps to be used in tests where drainability properties are of importance. In all cases, use water of the same quality as required in the pr

36、ocedure for which the pulp is disintegrated. For each disintegration, take a test portion corresponding to a mass of (50 5) g of oven-dry pulp. If the sample is in sheet-form, do not cut the sheets and avoid taking cut edges. If the dry matter content of the pulp is 20 % or more, soak the test porti

37、on in 1 l to 1,5 l of water (standard water or other) at (20 5) C for at least the minimum soaking time specified in Table 1. If the pulp is in the form of sheets or slabs, after soaking tear the sample into pieces of dimensions approximately 25 mm 25 mm. Soaking for a time longer than the minimum s

38、pecified, for example overnight, has been found not to have any significant effect on the results. The soaking time shall, however, never be longer than 24 h for any pulp grade. NOTE Flash-dried mechanical pulp needs to be soaked for a minimum of 10 min. EN ISO 5263-2:20043Table 1 Recommended soakin

39、g time for mechanical pulps Dry matter content of the pulp, % by mass Minimum soaking time 60 4 hWhere necessary for climatic reasons, a temperature of between 25 C and 30 C may be used, provided that this is stated in the test report. 6 Procedure Transfer the test portion after preparing as above i

40、nto the container of the Standard disintegrator (4.1). Add water of the same quality as used in Clause 5, at (20 5) C, to give a volume of (2 500 25) ml. Set the revolution counter to zero. Switch the motor on and allow the propeller to make the number of revolutions specified in Table 2. Stop the p

41、ropeller and check visually that the pulp is completely disintegrated, for instance by diluting a small portion from the disintegrator with water in a glass cylinder and inspecting it under transmitted light. If it is not completely disintegrated, continue the disintegration until complete separatio

42、n of fibres is achieved and/or the fibre bundles and fragments are separated to the extent expected in the pulp at the time of manufacture. Table 2 Recommended number of revolutions for mechanical pulps Dry matter content of the pulp % by mass Number of revolutions 20 10 000 W 20 30 000 If for any r

43、eason a different pulp charge or a different number of revolutions is used, this shall be stated in the test report. 7 Test report The test report shall include the following particulars: a) reference to this part of ISO 5263 (e.g., ISO 5263-2:2004); b) all the information necessary for complete ide

44、ntification of the sample; c) the water grade (standard water, distilled water or tap water) used; d) the soaking time; e) the dry matter content of the sample; f) any unusual features observed in the course of the test; g) any operations not specified in this International Standard, or that are reg

45、arded as optional, which might have affected the results. EN ISO 5263-2:20044 Annex A (normative) Construction of the Standard disintegration A.1 Materials All components that come into contact with pulp suspensions shall be resistant to water and to dilute acids and alkalis. Stainless steel or glas

46、s-fibre-reinforced plastic material is normally used. A.2 Standard disintegrator The cylindrical container, Figure A.1, is fitted with four equally spaced spiral baffles extending between 32 mm from the bottom and 57 mm from the lid, each baffle traversing half the internal circumference of the cont

47、ainer. The baffles spiral downwards in a clockwise direction. There is a fillet of radius 13 mm around the inside of the base of the container. The three-bladed propeller is mounted on a vertical shaft centrally in the container, at a fixed distance above the bottom. It is driven at the specified sp

48、eed in the stock and a counter is fitted to record the number of revolutions. The counter should preferably be of the pre-set type, which will switch off the disintegrator after the required number of revolutions. Viewed from above, the propeller rotates in a clockwise direction. The container is pr

49、ovided with a lid, which, in most disintegrators, is fitted to the propeller/motor assembly. The container is fixed firmly in position during operation of the disintegrator, but it is capable of being removed and replaced easily and quickly. A.3 Dimensions Part Dimension Specified value (unless otherwise stated) Tolerance container internal height iInternal diameter radius of fillet 191 mm 152 mm 13 mm 2 mm 2 mm 2mm baffles square section height from container base distance from rim ends radiused edges ra