EN ISO 5263-3-2004 en Pulps - Laboratory wet disintegration - Part 3 Disintegration of mechanical pulps at greater than 85 degrees C《纸浆 实验室湿解离 第3部分 机械浆解离(≥85oC)［代替 CEN EN ISO 5263］.pdf

1、BS EN ISO5263-3:2004ICS 85.040NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPulps Laboratorywet disintegrationPart 3: Disintegration of mechanicalpulps at 85 C (ISO 5263-3:2004)This British Standardwas published under theauthority of the StandardsPolicy and St

2、rategyCommittee on 30 April2009. BSI 2009ISBN 978 0 580 53926 8Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 5263-3:2004National forewordThis British Standard was published by BSI. It is the UK implementation of EN ISO 5263-3:2004. Together with BS EN ISO The UK participation

3、in its preparation was entrusted to TechnicalCommittee PAI/11, Methods of test for paper, board and pulps.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are

4、 responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.5263-1:2004 and BS EN ISO 5263-2:2004 it supersedes BS EN ISO 5263:1997 which is withdrawn.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 5263-3September 2004ICS 85.040 Sup

5、ersedes EN ISO 5263:1997 English versionPulps - Laboratory wet disintegration - Part 3: Disintegration ofmechanical pulps at 85 degrees C (ISO 5263-3:2004)Ptes - Dsintgration humide en laboratoire - Partie 3:Dsintgration des ptes mcaniques 85 degrs C(ISO 5263-3:2004)This European Standard was approv

6、ed by CEN on 2 August 2004.CEN members are bound to comply with the 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 nationalstand

7、ards may be obtained on application to the Central Secretariat or 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 th

8、e Central Secretariat has the same status as the officialversions.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,

9、 Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland 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 mean

10、s reservedworldwide for CEN national Members.Ref. No. EN ISO 5263-3:2004: EBS EN ISO 5263-3:2004ISO 5263-3:2004(E) ISO 2004 All rights reserved iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Definition 1 4 Apparatus. 2 5 Preparation of test portion. 2 6 Procedure. 3 7 Test repor

11、t 4 Annex A (normative) Construction of the Standard disintegrator 5 Annex B (normative) Checking the Standard disintegrator. 7 Annex C (normative) Circulation disintegrator . 8 Annex D (informative) The effect of latency in mechanical pulps. 9 Bibliography . 11 BS EN ISO 5263-3:2004ISO 5263-3:2004(

12、E) iv ISO 2004 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body int

13、erested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnic

14、al Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules 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

15、technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at 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.

16、ISO shall not be held responsible for identifying any or all such patent rights. ISO 5263-3 was prepared by Technical Committee ISO/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 whic

17、h has been technically revised. In the revision, ISO 5263 has been divided into three parts; Part 1 which is applicable to chemical 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 A

18、nnex has been inserted describing the effect of latency in mechanical pulps. ISO 5263 consists of the following parts, under the general title Pulps Laboratory wet disintegration: Part 1: Disintegration of chemical pulps Part 2: Disintegration of mechanical pulps at 20 C Part 3: Disintegration of me

19、chanical pulps at W 85 C BS EN ISO 5263-3:2004INTERNATIONAL STANDARD ISO 5263-3:2004(E) ISO 2004 All rights reserved 1Pulps Laboratory wet disintegration Part 3: Disintegration of mechanical pulps at W 85 C 1 Scope This part of ISO 5263 specifies an apparatus and the procedures for the laboratory we

20、t disintegration of mechanical pulps that exhibit latency. This apparatus and procedure are required for preparation of the test portion in a number of other International Standards dealing with pulps. ISO 5263-3 is applicable to all kind of mechanical pulps (i.e. mechanical, semi-chemical and chemi

21、-mechanical pulps) exhibiting latency. Mechanical pulps not exhibiting latency shall be disintegrated according to ISO 5263-2. The procedure specified in ISO 5263-2 should be used to disintegrate all mechanical pulps to be measured for brightness. NOTE Brightness is not significantly altered by the

22、presence of latency; 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 referen

23、ces, the latest 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,

24、the following 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 3.2 latency condition of a mechanical pulp

25、in which some of its properties are inhibited and require disintegration of the pulp at elevated temperature to be developed BS EN ISO 5263-3:2004ISO 5263-3:2004(E) 2 ISO 2004 All rights reservedNOTE 1 Latency is due to the distorted form of the fibres, acquired in mechanical processing, especially

26、at high consistency, and subsequently preserved upon cooling at 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 late

27、ncy removal procedure using a combination of mechanical treatment, i.e. disintegration, and heat treatment using a temperature exceeding the softening temperature of lignin NOTE In this part of ISO 5263, the temperature for latency removal is stated to be not less than 85 C. 4 Apparatus Ordinary lab

28、oratory apparatus and the following: 4.1 Disintegrator with heat supply or hot-water supply capable of maintaining a temperature of W 85 C in the suspension during the entire disintegration procedure. Use either the Standard disintegrator (4.1.1) or the Circulation disintegrator (4.1.2). Since the t

29、wo types of disintegrator do not treat the fibres in the same way (see 6), the disintegrator used must be reported. 4.1.1 Standard disintegrator, constructed as described in Annex A. For latency removal, the Standard disintegrator shall be equipped with an electrically heated container or shall have

30、 a supply of hot water, capable of keeping the temperature of the fibre-water suspension at the temperature stated in 4.1. NOTE 1 The procedure for checking the Standard disintegrator is given in Annex B. NOTE 2 For safety reasons, it is not recommended to use a Standard disintegrator intended for d

31、isintegration at 20 C and an electric hot plate for boiling water. 4.1.2 Circulation disintegrator, of Domtar type, constructed as described in Annex C. The disintegrator shall have a supply of water of a temperature of between 90 C and 95 C. There must be a means of running the pump for short inter

32、vals of time. To prevent damage to the pump, the pump must not run dry for more than 3 s. 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 ma

33、tter content in accordance 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

34、 done by sedimentation of 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 quali

35、ty as required in the procedure for which the pulp is disintegrated. BS EN ISO 5263-3:2004ISO 5263-3:2004(E) ISO 2004 All rights reserved 3For the Standard disintegrator (4.1.1), take a test portion corresponding to a mass of (50 5) g of oven-dry pulp. For the Circulation disintegrator (4.1.2), take

36、 a test portion corresponding to a mass of (56 1) 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 comprises 20 % or more of the sample, soak the test portion in 1 l to 1,5 l of water (standard water or other) at (20 5) C for at

37、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 specified, for example overnight, has been found not to have any significa

38、nt 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. Table 1 Recommended soaking time for mechanical pulps Dry matter content of the pulp, % by mass Minimum soaking time 6

39、0 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 6.1 Disintegration and latency removal WARNING Since the hot-disintegration procedure involves the treatment of the test portion at a temperatur

40、e exceeding 85 C, cautions must be taken to prevent scalding. Information regarding the effect of latency in mechanical pulps (or in pulps having a high lignin content) is given in Annex D. 6.2 Standard disintegrator Transfer the test portion, after preparing as described in Clause 5, into the conta

41、iner of the Standard disintegrator (4.1.1). Add water of the same quality as used in Clause 5 to give a total volume of (2 500 25) ml. Use the heater to heat the mixture to W 85 C. Set the revolution counter to zero. Switch the motor on and allow the propeller to make 30 000 revolutions. Stop the pr

42、opeller 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 separation

43、 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. At the end of the disintegration, the temperature shall not be less than 85 C. If for any reason a different pulp charge or a different number of revolutions is

44、used, this shall be stated in the test report. Immediately after disintegration, dilute the pulp suspension using cold water of the same quality as used in Clause 5, to a concentration not less than 3 g/l. If necessary, cool the suspension to approximately 20 C. BS EN ISO 5263-3:2004ISO 5263-3:2004(

45、E) 4 ISO 2004 All rights reserved6.3 Circulation disintegrator To heat the Circulation disintegrator (4.1.2), fill the disintegrator container with water at a temperature between 90 C and 95 C to within 4 cm of the top of the container. Close the lid tightly. Start the recirculation pump and allow i

46、t to operate for (2,0 0,1) min. After the pump has stopped, open the drain of the container slightly and measure the temperature of the water leaving the container. Drain the water completely and repeat this cycle until this temperature exceeds 90 C. NOTE This preliminary step with hot water is done

47、 to heat the container, piping and pump. Immediately add water, of the same quality as used in Clause 5, at a temperature between 90 C and 95 C until the container is approximately half-full. Transfer the test portion, after preparing as described in Clause 5, to the Circulation-disintegrator contai

48、ner and add water at a temperature between 90 C and 95 C to within 4 cm of the top of the container. Close the lid tightly and start the timer to operate the pump for (2,0 0,1) min. Use caution when removing the lid, since pressure might build up during the operation. Measure the temperature and rep

49、eat the disintegration if the temperature is below 85 C. If fibre bundles and fragments are not separated to the extent expected in the pulp at the time of manufacture, continue the disintegration. When the disintegration is completed, open the drain valve and run the pump for a brief interval to drain the test portion into a collection pail. Open the lid and, with the drain valve closed, add about 4 l of hot water into the container. Close the lid, run the pump for 2 s, then open the dr