EN ISO 287-2009 en Paper and board - Determination of moisture content of a lot - Oven-drying method《纸和纸板 批水分含量的测定 烘干法［代替 CEN EN 20287］》.pdf

1、BS EN ISO287:2009ICS 85.060NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPaper and board Determination ofmoisture content ofa lot Oven-dryingmethod (ISO 287:2009)This British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee

2、 on 31 July 2009 BSI 2009ISBN 978 0 580 59137 2Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 287:2009National forewordThis British Standard is the UK implementation of EN ISO 287:2009. Itsupersedes BS EN 20287:1994 which is withdrawn.The UK participation in its preparation was

3、 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 responsible for its c

4、orrect application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 287June 2009ICS 85.060 Supersedes EN 20287:1994 English VersionPaper and board - Determination of moisture content of a lot -Oven-drying method (IS

5、O 287:2009)Papier et carton - Dtermination de la teneur en humiditdun lot - Mthode par schage ltuve (ISO 287:2009)Papier und Pappe - Bestimmung des Feuchtegehalteseines Lieferpostens - Wrmeschrankverfahren (ISO287:2009)This European Standard was approved by CEN on 27 May 2009.CEN members are bound t

6、o 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 nationalstandards may be obtained on application to the CEN Man

7、agement 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as t

8、heofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia,

9、 Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN n

10、ational Members.Ref. No. EN ISO 287:2009: EBS EN ISO 287:2009EN ISO 287:2009 (E) 3 Foreword This document (EN ISO 287:2009) 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 whic

11、h 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 December 2009, and conflicting national standards shall be withdrawn at the latest by December 2009. Attention is drawn to the pos

12、sibility 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 20287:1994. According to the CEN/CENELEC Internal Regulations, the national standards o

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

14、, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 287:2009 has been approved by CEN as a EN ISO 287:2009 without any modification. BS EN ISO 287:2009ISO 287:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv Introducti

15、on v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Principle. 1 5 Apparatus 2 6 Preparation of containers 2 7 Sampling 2 8 Selection, preparation and weighing of test pieces 2 9 Procedure 5 10 Calculation and expression of results 6 11 Precision 6 12 Test report . 7 Bibliograph

16、y . 9 BS EN ISO 287:2009ISO 287:2009(E) iv ISO 2009 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 techn

17、ical 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, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely

18、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/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft In

19、ternational 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 member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document

20、may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 287 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee SC 2, Test methods and quality specifications for paper and board. This third edition cance

21、ls and replaces the second edition (ISO 287:1985), which has been technically revised. The title has been elucidated so that it can be seen from the title that the method is intended for determination of the moisture content of a lot at the time of sampling. For determinations of the dry matter cont

22、ent of a sample of paper or board, e.g. for calculation of the dry mass of the sample, ISO 638 1is recommended. BS EN ISO 287:2009ISO 287:2009(E) ISO 2009 All rights reserved vIntroduction The determination of dry matter content and moisture content are carried out for different purposes. ISO 638 1i

23、s used in cases where the dry matter content is needed to calculate the result of chemical analysis or physical testing and when the determination of the moisture content of a sample, rather than a lot, is required. As an example, the dry matter content of the sample is needed to express the content

24、 of elements, such as cadmium and manganese, in relation to the oven-dry mass of the sample. This International Standard is used for the purpose of determining the average moisture content and the variation in moisture content (maximum and minimum values) of a lot. In the paper and board trade, the

25、moisture content is important since it influences converting processes, such as printing and copying. The moisture content also has an influence on curl and dimensional stability. BS EN ISO 287:2009BS EN ISO 287:2009INTERNATIONAL STANDARD ISO 287:2009(E) ISO 2009 All rights reserved 1Paper and board

26、 Determination of moisture content of a lot Oven-drying method 1 Scope This International Standard specifies an oven-drying method for the determination of the moisture content of a lot of paper and board. The procedure in Clause 8, describing how the test pieces are drawn from the lot, is performed

27、 at the time of sampling. This International Standard is applicable to every type of lot of paper and board, including corrugated board and solid board, provided that the paper or board does not contain any substances, other than water, that are volatile at the temperature specified in this Internat

28、ional Standard. For the determination of the dry matter content of a sample, ISO 638 1can be used. 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

29、t edition of the referenced document (including any amendments) applies. ISO 186, Paper and board Sampling to determine average quality 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 moisture content 2HOw content of water in paper or board,

30、i.e. the ratio of the loss of mass of a test piece, when dried according to the procedure described in this International Standard, to its mass at the time of sampling NOTE The moisture content is normally expressed as a percentage mass fraction. 3.2 constant mass mass reached by a test piece of pap

31、er or board after drying at a temperature of (105 2) C until the difference between two successive dryings and weighings, separated in time by at least half the initial drying period, does not exceed 0,1 % of the initial mass of the test piece at the time of sampling 4 Principle At the time of sampl

32、ing, weighing of test pieces taken from a lot and weighing the test pieces again after drying to constant mass. From the mass of a test piece before and after drying, the moisture content is calculated. BS EN ISO 287:2009ISO 287:2009(E) 2 ISO 2009 All rights reserved5 Apparatus 5.1 Balance, having a

33、n accuracy of 0,05 % of the mass to be weighed, or better. 5.2 Containers, for the transport and weighing of test pieces, which shall be water-vapour proof and made from a lightweight material that is not subject to change under the conditions of test. 5.3 Oven, capable of maintaining the air temper

34、ature at (105 2) C, and suitably ventilated to maintain a uniform temperature in the usable volume whilst extracting the moisture driven off the test pieces. 5.4 Desiccator. 6 Preparation of containers Before sampling, number a sufficient number of clean, dry containers (5.2). Allow the containers t

35、o attain temperature equilibrium with the atmosphere. Use a balance (5.1) and weigh each container. Keep the containers closed until the sample is about to be taken. 7 Sampling Select the units to be sampled in accordance with ISO 186. Precautions shall be taken when handling the paper or board to a

36、void contamination and any gain or loss of moisture if the atmosphere at the place of sampling is warm and damp. It is recommended to wear plastic or rubber gloves. To avoid moisture changes due to atmospheric exposure, it is important to enclose all test pieces in their containers immediately after

37、 taking them. 8 Selection, preparation and weighing of test pieces 8.1 General For each unit withdrawn from the lot, proceed as specified in 8.2 or 8.3. 8.2 If the unit is a package that can be and may be unwrapped 8.2.1 When the unit is not subdivided 8.2.1.1 Average moisture content, grammage 225

38、g/m2Discard the three outermost sheets and all damaged sheets. The number of layers discarded may need to be increased according to the efficiency of wrapping and the influence of storage conditions. Take at least four consecutive sheets; quickly fold or cut them and enclose them together in one of

39、the containers. The contents of a container constitute a test piece, which shall have a mass of at least 50 g. Weigh the container with its contents and calculate the mass of the test piece at the time of sampling, m0. Prepare duplicate test pieces for each unit sampled. Where the bulk of a 50 g tes

40、t piece is very large, as for instance for very lightweight papers, a smaller mass of at least 25 g may be used. If a smaller mass is used, state this mass in the test report. BS EN ISO 287:2009ISO 287:2009(E) ISO 2009 All rights reserved 38.2.1.2 Average moisture content, grammage W 225 g/m2Discard

41、 the three outermost sheets and all damaged sheets. The number of layers discarded may need to be increased according to the efficiency of wrapping and influence of storage conditions. Take one or more sheets to provide sufficient strips, of width 50 mm to 75 mm and length not less than 150 mm, to g

42、ive a total mass of at least 50 g. The strips constitute the test piece. Immediately enclose the test piece in one of the containers. Weigh the container with its contents and calculate the mass of the test piece at the time of sampling, m0. Prepare duplicate test pieces for each unit sampled. 8.2.1

43、.3 Variation in moisture content of the sheets For the determination of the variation between the centre and edges of the sheets, select a layer of sheets in accordance with 8.2.1.1 or 8.2.1.2. Take sufficient consecutive sheets to give one edge test piece and one centre test piece, as described bel

44、ow, each having a mass of at least 50 g. From the selected layer of sheets, cut four sets of strips of width 50 mm to 75 mm, one strip from each edge and two strips near the centre, as shown in Figure 1, taking care not to separate either the sheets or the strips comprising a set. Cut the strips wit

45、h their longer dimension in the cross-direction. Trim the ends of the strips to remove any paper or board within 150 mm of the edge of the original layer of sheets. NOTE This direction of cut is chosen because any moisture variation across the width of the machine remaining in the paper from the pap

46、ermaking operation will then be equally represented on each strip. Dimensions in millimetres Key A cross-direction of paper B edge test strip C centre test strip D centre test strip E edge test strip Figure 1 Positions of edge and centre test strips BS EN ISO 287:2009ISO 287:2009(E) 4 ISO 2009 All r

47、ights reservedDiscard the top and bottom strip from each set; combine the two sets representing the centre to form one test piece and the two from the edges to form another test piece. Each test piece shall have a mass of at least 50 g. Immediately, place each test piece in a container. Weigh each c

48、ontainer with its contents and calculate the mass of each test piece at the time of sampling, m0. Prepare duplicate test pieces for each unit and position sampled. Where the bulk of a 50 g test piece is very large, as for instance for very lightweight papers, a smaller mass of at least 25 g may be u

49、sed. If a smaller mass is used, state this mass in the test report. 8.2.2 When the unit is composed of elements Select reams, parcels, etc. in accordance with ISO 186 and proceed as specified in 8.2.2.1 to 8.2.2.3, as appropriate. 8.2.2.1 Average moisture content, grammage 225 g/m2From the centre of each ream or parcel, take at least four consecutive sheets and then proceed as specified in 8.2.1.1. 8.2.2.2 Average moisture content, grammage W 225 g/m2From the centre of each ream or parcel, take at least four consecutive s