1、BRITISH STANDARD BS5880:1990 ISO5637:1989 Method for Determination of water absorption of paper and board after immersion in waterBS5880:1990 This BritishStandard, having been prepared under the directionof the Paper and PrintingStandards Policy Committee, was published underthe authority of the Boa
2、rdofBSI and comes into effecton 30June1990 BSI 11-1999 First published October1982 Second edition June1990 The following BSI references relate to the work on this standard: Committee reference PAM/11 Draft for comment88/37929DC ISBN 0 580 18519 2 Committees responsible for this BritishStandard The p
3、reparation of this BritishStandard was entrusted by the Paper and Printing Standards Policy Committee (PAM/-) to Technical Committee (PAM/11), upon which the following bodies were represented: British Fibreboard Packaging Association British Paper and Board Industry Federation (PIF) British Printing
4、 Industries Federation British Telecommunications plc Envelope Makers and Manufacturing Stationers Association Her Majestys Stationery Office Man-made Fibres Producers Committee Ministry of Defence Paper Sack Development Association Ltd. Pira (the Research Association for the Paper and Board, Printi
5、ng and Packaging Industries) Post Office Society of British Printing Ink Manufacturers University of Manchester Institute of Science and Technology Amendments issued since publication Amd. No. Date CommentsBS5880:1990 BSI 11-1999 i Contents Page Committees responsible Inside front cover National for
6、eword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Principle 1 5 Reagent 1 6 Apparatus 1 7 Sampling preparation of test pieces 1 8 Procedure 1 9 Expression of results 2 10 Test report 2 Publications referred to Inside back coverBS5880:1990 ii BSI 11-1999 National foreword This BritishStan
7、dard has been prepared under the direction of the Paper and Printing Standards Policy Committee. It is identical with ISO5637:1989 “Paperand board Determination of water absorption after immersion in water”, published by the International Organization for Standardization (ISO). Itsupersedes BS5880:1
8、982 which is withdrawn. ISO769:1972, for which there is no corresponding BritishStandard, is referred to for information only. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Complian
9、ce with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding BritishStandard ISO186:1985 BS3430:1986 Method for sampling to determine the average quality of paper and board (Identical) ISO187:1977 BS3431:1973 Method for t
10、he conditioning of paper and board for testing (Technically equivalent) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments in
11、corporated. This will be indicated in the amendment table on the inside front cover.BS5880:1990 BSI 11-1999 1 1 Scope This International Standard specifies a method for the determination of the water absorption of paper and board after total immersion in water for a specified time. The method is app
12、licable to all types of paper and board which have a degree of water resistance, it is not applicable to very absorbent papers such as toilet tissue. NOTEThe method is analogous to that specified in ISO769:1972, Fibre building boards Hard and medium boards Determination of water absorption and of sw
13、elling in thickness after immersion in water. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to rev
14、ision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO186:1985, Paper and boar
15、d Sampling to determine average quality. ISO187:1977, Paper and board Conditioning of test samples. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 water absorption the mass of water absorbed per unit area under the specified conditions of test 3.2
16、 relative water absorption the ratio of the mass of water absorbed to the mass of the conditioned test piece 4 Principle Weighing the test piece before and after immersion in water and calculating the water absorption, in grams per square metre, or the relative water absorption as the percentage inc
17、rease in mass. 5 Reagent Water, freshly distilled or deionized, at23 C 1 C. Keep in a closed container until required for use. 6 Apparatus 6.1 Balance, accurate to0,01g. Check the balance frequently by applying accurately measured masses, with both increasing and decreasing loads. 6.2 Tank of water,
18、 large enough to hold at least10test pieces in a vertical position, and thermostatically controlled without circulation. Take care to ensure that the tank has been carefully washed with the reagent water (see clause5) so that it is free from surfactants. 6.3 Support system that prevents a limp test
19、piece from folding over on itself (see8.3 and8.4), such as a wire drainage jig with spring clips or similar to hold three corners of the test piece. 6.4 Tared containers of suitable size, such as pre-weighed polyethylene bags. 7 Sampling preparation of test pieces 7.1 Sampling Select the sample in a
20、ccordance with ISO186. 7.2 Preparation of test pieces Cut at least10pieces each of them measuring200mm 1mm 250mm1mm, with the longer side in the machine direction. Cut the test pieces one at a time, ensuring that the edges are straight, cleanly cut and undamaged. Cut an extra piece for checking satu
21、ration (see8.2). NOTEAny accurately known area, e.g.die-cut test pieces at least100mm 100mm, may be used, provided that the precision of the balance(6.1) and the calculations(9.1) are adjusted accordingly and provided that it has been established that the adjusted results are equivalent to those for
22、 standard size test pieces for the specific type of paper or board. The effect of a change in test piece dimensions may depend on the product when testing products which absorb slowly at the surface and quickly at the edges. 7.3 Conditioning Condition the test pieces in accordance with ISO187. 8 Pro
23、cedure 8.1 Weigh each test piece separately in a tared container(6.4) to an accuracy of 0,01g. 8.2 Select the appropriate immersion time from the following: low water resistance:5min 5s; medium water resistance:30min1min; high water resistance:24h 15min.BS5880:1990 2 BSI 11-1999 Unless it is known t
24、hat the immersion time chosen will not cause complete saturation of the test pieces, verify using the extra test piece (see7.2). After immersion for the selected time and determination of mass(8.4 and8.5), replace in the water for a further immersion period equal to at least half the initial time. I
25、f the selected immersion time causes the test piece to be completely saturated, use the next shorter immersion time (unless otherwise specified). NOTESaturation of a test piece is achieved when continued immersion results in no further increase in mass. 8.3 Immerse each test piece vertically in clea
26、n water (clause5) in the tank(6.2), suspending the test piece by the clips, so that the machine direction is vertical and the upper edge is at least20mm below the surface. Ensure that the test pieces are well separated from each other and from the bottom and sides of the tank. 8.4 After the selected
27、 immersion time has expired, remove the test pieces from the water and, suspending them vertically from one corner, allow the water to drain off for2min. If necessary, for limp test pieces such as towelling, use the support system(6.3) to prevent the test piece from folding over on itself and entrap
28、ping water between the folds. Otherwise, discard test pieces that fold over upon themselves during draining. Return each drained test piece to its tared container(6.4). 8.5 Repeat the mass determination on each test piece. 8.6 From the measurements made, calculate for each test piece the water absor
29、ption or the relative water absorption as required, using the appropriate method given in clause9. Report the mean value and the range of results or standard deviation or coefficient of variation of the property required. 9 Expression of results 9.1 Water absorption The water absorption, expressed i
30、n grams per square metre, is given by the formula where m 1 is the mass, in grams, of the conditioned test piece before immersion; m 2 is the mass, in grams, of the test piece immediately after immersion for the specified period; A is the test piece area, in square centimetres. Express the result to
31、 the nearest1g/m 2 . 9.2 Relative water absorption The relative water absorption, expressed as a percentage, is given by the formula where m 1and m 2are as defined in9.1. Express the result to the nearest1%. 10 Test report The test report shall include the following particulars: a) reference to this
32、 International Standard; b) time of immersion (see8.3); c) mean value of the property required; d) range or standard deviation or coefficient of variation of the property required; e) number of tests; f) temperature and relative humidity of test atmosphere; NOTEThis requirement is included because,
33、at the present time, the water temperature of23 C may not be the same as the temperature of the conditioning room. g) any deviation from the procedure specified in this International Standard, including the use of non-standard size test pieces. NOTEIf the test pieces delaminate, the test report shou
34、ld be limited to a statement that this has occurred. m 2 m 1 () 10 000 A - m 2 m 1 () 100 m 1 - BS5880:1990 BSI 11-1999 Publications referred to See national foreword.BS5880:1990 ISO5637:1989 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body
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