1、BRITISH STANDARD BS5879:1980 ISO5635:1978 Method for Measurement of dimensional change of paper after immersion in water ISO title: Paper Measurement of dimensional change after immersion in water UDC676.017.22:532.696.52BS5879:1980 This British Standard, having been prepared under the directionof t
2、he Paper StandardsCommittee, waspublished under the authorityofthe Executive Boardand comes into effect on 31 March1980 BSI10-1999 The following BSI references relate to the work on this standard: Committee reference PAS/11 Draft for comment77/60824DC ISBN 0 580 11267 5 Cooperating organizations The
3、 Paper Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and professional and industrial organizations: British Paper and Board Industry Federation (PIF)* British Printing Industries Federation* Envelop
4、e Makers and Manufacturing Stationers Association* Her Majestys Stationery Office* Institute of Trading Standards Administration National Association of Paper Merchants Pira (The Research Association for the Paper and Board, Printing and Packaging Industries)* Royal Institute of Public Health and Hy
5、giene The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Wood Pulp Association Chemical Industries Association Fibreboard Packing Case Manufacturers Asso
6、ciation Man-made Fibres Producers Committee Ministry of Defence Post Office Society of British Printing Ink Manufacturers University of Manchester (Institute of Science and Technology) Amendments issued since publication Amd. No. Date of issue CommentsBS5879:1980 BSI 10-1999 i Contents Page Cooperat
7、ing organizations Inside front cover National foreword ii 1 Scope 1 2 Field of application 1 3 References 1 4 Definition 1 5 Principle 1 6 Apparatus 1 7 Sampling 1 8 Conditioning 1 9 Preparation of test pieces 1 10 Procedure 1 11 Expression of results 1 12 Precision 1 13 Test report 1 Figure Test pi
8、ece marker 2 Publications referred to Inside back coverBS5879:1980 ii BSI 10-1999 National foreword This British Standard has been prepared under the direction of the Paper Standards Committee. It is identical with ISO5635 “Paper Measurement of dimensional change after immersion in water”, which was
9、 developed by Technical Committee ISO/TC6, Paper, board and pulps, and was published by the International Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication, without deviation, as a BritishStandard
10、. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal ma
11、rker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “BritishStandard”. NOTETextual error. In clause1, “hydro-expansivity” should be read as “hygro-expansivity”. A British Standard does not purport to include all the necessary provisions of a c
12、ontract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard ISO186:1977 BS3430:1979 Method for sampling for test
13、ing paper and board (Identical) ISO187:1977 BS3431:1973 Method for the 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
14、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.BS5879:1980 BSI 10-1999 1 1 Scope This International Standard specifies a method of measuring the dimensional change of paper after immersion in wat
15、er. This property should not be confused with hydro-expansivity. 1) 2 Field of application The method described in this International Standard is suitable for use with most kinds of paper. However, it may not be suitable for some papers, which soaking makes extremely fragile or causes to curl excess
16、ively. 3 References ISO186, Paper and board Sampling for testing. ISO187, Paper and board Conditioning of test samples. 4 Definition For the purpose of this International Standard, the following definition applies: dimensional change the change in length, in the machine or cross direction, resulting
17、 from the immersion in water of paper previously conditioned in a standard atmosphere, relative to the length measured in the conditioned state. It is normally expressed as a percentage 5 Principle Soaking of a strip of paper in water until no further change in length occurs and measurement of the c
18、hange in length. An essential requirement of the test is that the paper should not be under any load while wet; most papers are very weak when wet and an extremely small load is sufficient to stretch them. 6 Apparatus 6.1 Test piece marker, consisting of a rigid bar of a material that is stable unde
19、r the conditions of test and measuring approximately250mm 40mm 5mm, having two metal pins, filed so that the tips are chisel-shaped, set into one of the narrow edges200 2mm apart (seethe Figure). 6.2 Magnifying lens. 6.3 Accurate graticule for measurement. The graticule should be graduated to0,2mm.
20、7 Sampling Sample as described in ISO186. 8 Conditioning Condition the sample according to ISO187. 9 Preparation of test pieces Cut five test pieces for each test, each250mm long and15mm or20mm wide, the longer dimension being in the direction in which the property is to be measured. 10 Procedure Pl
21、ace the test piece on a flat surface and cut two small slits in it,200mm apart, by means of the chisel-shaped tips in the rigid bar(6.1). Then place it in a dish and soak it in distilled water at the temperature selected for conditioning (seeclause8) until maximum variation has occurred,15min usuall
22、y being sufficient. At the end of this time, remove the test piece from the dish and lay it carefully on a flat surface, taking care not to stretch the test piece. Immediately re-locate one of the chisel-shaped tips in the bar in one of the slits previously cut into the test piece and align the bar
23、along the straight line connecting the two previously cut slits. Cut a further slit with the chisel-shaped tip at the other end of the bar. Measure the distance between the first and second slits cut into the test piece with the aid of the magnifying lens(6.2) and graticule(6.3). The cuts in the pap
24、er will be chisel-shaped, with one side vertical. Measure the distance from the vertical sides of the cuts. 11 Expression of results The change in length expressed as a percentage of the original length, where the test length is2002mm as required in this method, is given by the following formula: 0,
25、5 %L % where %L is the change in length, in millimetres. 12 Precision No information is at present available on the repeatability or reproducibility of this method. 13 Test report The test report shall state the following particulars: a) reference to this International Standard; 1) At International
26、Standard concerning hygro-expansivity is in preparation.BS5879:1980 2 BSI 10-1999 b) the direction or directions of the paper for which the property has been measured; c) the conditioning atmosphere used; d) the soaking time used and the temperature of the water used; e) the average of the five resu
27、lts to the nearest0,1%; f) any deviation from this International Standard and any circumstances or influences that may have affected the results. Figure Test piece markerBS5879:1980 BSI 10-1999 Publications referred to Seenational foreword.BS5879:1980 ISO5635:1978 BSI 389 Chiswick High Road London W
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