BS EN ISO 4119-1995 Pulps Determination of stock concentration《纸浆 浆料浓度的测定》.pdf

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1、BRITISH STANDARD BS EN ISO 4119:1996 Incorporating Amendment No. 1 BS ISO 4119:1995 renumbered Implementation of EN ISO 4119:1996 Pulps Determinationof stock concentration The European Standard EN ISO 4119:1996 has the status of a British StandardBSENISO4119:1996 This British Standard, having been p

2、repared under the directionof the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15 October 1995 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference PAI/11 Draft for comment 92/4948

3、0 DC ISBN 0 580 24762 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PAI/11, Methods of test for paper, board and pulps, upon which the following bodies were represented: British Apparel and Textile Confederation Briti

4、sh Carton Association British Fibreboard Packaging Association British Printing Industry Federation Envelope Makers and Manufacturing Stationers Association Her Majestys Stationery Office Institute of Paper Conservation Ministry of Defence Paper Federation of Great Britain Pira International Univers

5、ity of Manchester Institute of Science and Technology Amendments issued since publication Amd. No. Date Comments 9266 October 1996 Indicated by a sideline in the marginBSENISO4119:1996 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Foreword iii

6、Text of ISO 4119 1BSENISO4119:1996 ii BSI 08-1999 National foreword This British Standard has been prepared by Technical Committee PAI/11 and isthe English language version of EN ISO4119:1996 Pulps Determination ofstock concentration, published by the European Committee for Standardization(CEN). It

7、is identical with ISO 4119:1995 published by the International Organization (ISO). It supersedes BS5878:1980, which is withdrawn. EN ISO 4119:1996 was produced as a result of international discussions in whichthe United Kingdom took an active part. EN ISO 4119:1996 has been approved by CEN member bo

8、dies under the weightedvoting procedures introduced in 1988 to coincide with the introductionof “NewApproach” Directives from the Commission of the European Community. This British Standard is published under the direction of the Sector Board for Materials and Chemicals whose Technical Committee PAI

9、/11 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOT

10、EInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their corr

11、ect application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, page 2, the ISO title page, pages ii to iv, pages 1 and 2 and aback cove

12、r. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4119 April 1996 ICS 85.040 Descriptors: Paper pulps, tests, determination

13、of content, dry matter English version Pulps Determination of stock concentration (ISO 4119:1995) Ptes Dtermination de la concentration en pte (ISO 4119:1995) Halbstoffe Bestimmung der Stoffdichte (ISO4119:1995) This European Standard was approved by CEN on 1996-04-05. CEN members are bound to compl

14、y 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 the Central Secr

15、etariat 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 Central Secretariat has the same status as the offi

16、cial versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de

17、Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN ISO 4119:1996 EENISO4119:1996 BSI 08-1999 2 Foreword The

18、text of the International Standard from Technical Committee ISO/TC6, Paper, board and pulp, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC172, Pulp, paper and board, the secretariat of which is held by DIN. This Eu

19、ropean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 1996, and conflicting national standards shall be withdrawn at the latest by October 1996. According to the CEN/CENELEC Internal Regulations, the n

20、ational standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.ISO4119:1995(E)

21、 ii BSI 08-1999 Contents Page Foreword iii 1 Scope 1 2 Definitions 1 3 Apparatus 1 4 Sampling and sample preparation 1 5 Procedure 1 6 Expression of results 2 7 Test report 2ISO4119:1995(E) BSI 08-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of

22、 national 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. Int

23、ernational 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. Draft International Standards adopted by the technical c

24、ommittees are circulated to the member bodies for voting. Publication as an InternationalStandard requires approval by at least75% of the member bodies casting a vote. International Standard ISO 4119 was prepared by Technical Committee ISO/TC6, Paper, board and pulps, Subcommittee SC5, Test methods

25、and quality specifications for pulp. This second edition cancels and replaces the first edition (ISO4119:1978), of which it constitutes a technical revision.iv blankISO4119:1995(E) BSI 08-1999 1 1 Scope This International Standard specifies a method for determining the stock concentration of aqueous

26、 pulp suspensions. It is used in laboratory procedures for the determination of other pulp properties and is referred to in a range of other ISOstandards where pulp suspensions are involved. It is not intended for determining the saleable mass of slush pulps. In principle, this method is applicable

27、to all kinds of aqueous pulp suspensions. 2 Definitions For the purposes of this International Standard, the following definitions apply. 2.1 stock aqueous suspension of one or more pulps, which may contain fillers and additives 2.2 stock concentration ratio of the oven-dry mass of material that can

28、 be filtered from a stock sample, to the mass of unfiltered sample, when determined as specified in this International Standard NOTE 1In this International Standard, the stock concentration is expressed as a percentage by mass % (m/m). 3 Apparatus Ordinary laboratory apparatus and 3.1 Weighing conta

29、iners, of sufficient size for weighing the stock sample or the filter (seeclause5,note4). 3.2 Balance, capable of weighing a mass of100g to500g with an error of less than0,1%. 3.3 Filtering device, such as a Bchner funnel, of diameter 90mmto150mm, a large filtering flask, and circular filter paper t

30、o fit the funnel; the paper shall be such that all visible fibre and inorganic material will be retained. 3.4 Means for drying the sample, for example suitable drying oven or hotplate. The temperature of the drying oven shall be105 C 2 C and that of the hotplate150 C 15 C. NOTE 2A microwave oven may

31、 optionally be used if the operating conditions (power setting and drying time) are experimentally determined to produce the same drying effect on pulp as produced by a normal drying oven. Incorrect operating conditions may cause charring of the sample. NOTE 3A temperature of150 C for the hotplate m

32、ay be too high for some pulps and cause charring of the sample. 3.5 Balance, capable of weighing the dried mat of fibres with an error of less than0,1%. 4 Sampling and sample preparation 4.1 General Mix the stock thoroughly, and stir it while the sample is being taken. Samples shall be removed with

33、a suitable vessel by a scooping action, to minimize the separation of fibres from the water. The entire sample may be obtained in one dipping action, or several smaller samples may be combined, but all of the stock removed shall be included in the sample to be weighed. Incorrect sampling techniques

34、can introduce significant errors at higher concentrations. Take samples for two determinations, or as many as are indicated in the test method for which the determination of stock concentration is being made. 4.2 Stock concentrations less than 0,3% (m/m) Take a sample of at least500g (500ml), and su

35、fficient to ensure a mass of oven-dry fibre of between1g and5g. Weigh the sample in a tared container (3.1) and determine the net mass (m 1 ) with an error of less than 0,5g, using the balance(3.2). 4.3 Stock concentration between 0,3 % (m/m) and 1 % (m/m) Take a sample of approximately500g, pour it

36、 into a tared container(3.1) and determine the net mass(m 1 ) with an error of less than0,5g, using the balance(3.2). 4.4 Stock concentration more than 1 % (m/m) Take a sample of approximately500g, pour it into a tared container(3.1) and determine the net mass (m 1 ) with an error of less than0,5g,

37、using the balance(3.2). Dilute with water, the mass of which(m 2 ) is known with an error of less than0,5%, to give a stock concentration of less than1%. Mix thoroughly, take an aliquot of about500g, pour into a tared container(3.1) and determine the mass (m 3 ) of the aliquot. 5 Procedure Dry a fil

38、ter paper(3.3) in a drying oven or on a hotplate(3.4) at the appropriate temperature to constant mass. Weigh it immediately and record the mass (m 4 ). Carry out all weighings to the nearest0,01g. The filter paper is considered as having reached constant mass when two consecutive weighings do not di

39、ffer by more than0,01g. In all cases the drying period between two consecutive weighings shall be no longer than necessary, but at least one-fourth of the total drying time previously applied. NOTE 4Weighing of the dried filter paper can also be carried out after cooling in a tared container(3.1).IS

40、O4119:1995(E) 2 BSI 08-1999 Place the filter paper in the Bchner funnel (see3.3), and wet it. Apply suction and filter the stock sample (seeclause4) contained in the measuring cylinder or a tared container(3.1), rinse the inner walls of the cylinder or container, and add the rinsings to the funnel.

41、Make sure that the filtrate is clear and, if not, filter again through the same filter, or run another test, with a denser filter paper. Wash the mat of fibres with successive small quantities of distilled or deionized water. Remove the filter paper and the mat of fibres carefully from the funnel, t

42、aking care that all the solid matter from the funnel walls is included. Dry and weigh the mat of fibres and the filter paper as specified above, using the same procedure as when drying and weighing the filter paper. Record the mass (m 5 ). 6 Expression of results The stock concentration X, expressed

43、 as a percentage by mass, is given by the formula where If the sample has been prepared according to4.4, the stock concentration is given by the formula where Report the result as the mean of the determinations to two decimal places. 7 Test report The test report shall include the following informat

44、ion: a) reference to this International Standard; b) all the information necessary for complete identification of the sample; c) the stock concentration, expressed as a percentage by mass; d) any unusual features observed in the course of the test; e) any operations not specified in this Internation

45、al Standard, which might have affected the results. m 1 is the mass, in grams, of the initial sample taken; m 4 is the dry mass, in grams, of the filter paper; m 5 is the dry mass, in grams, of the fibre mat and filter paper. m 1 is the mass, in grams, of the initial sample taken; m 2 is the amount

46、of water added to dilute the initial sample taken, in grams; m 3 is the mass of the aliquot taken, in grams; m 4 is the dry mass, in grams, of the filter paper; m 5 is the dry mass, in grams, of the fibre mat and filter paper.3 blankBS EN ISO 4119:1996 BSI 389 Chiswick High Road London W4 4AL BSIBri

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