1、BRITISH STANDARD BS2922-1: 1985 ISO3689:1983 Incorporating Amendment No.1 Strength of wet paper and board Part1: Method for determination of the bursting strength of paper and board after immersion in water ISO title: Paper and board Determination of bursting strength after immersion in water UDC676
2、.017.44:539.412BS2922-1:1985 This British Standard, having been prepared under the directionof the Paper StandardsCommittee, was published under the authority ofthe Board of BSI and comes intoeffect on 31January1985 BSI11-1999 First published as BS2922 February1958 First revision as BS2922-1 Februar
3、y1980 Second revision January1985 The following BSI references relate to the work on this standard: Committee reference PAM/11 Draft (ref84/36798) announced BSI News June1984 ISBN 0 580 14216 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by
4、 the Paper Standards 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 Industries Federation British Wood Pulp Association Envelope Makers and M
5、anufacturing 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, Printing and Packaging Industries) Post Office Society of British Printing Ink Ma
6、nufacturers University of Manchester Institute of Science and Technology Amendments issued since publication Amd. No. Date of issue Comments 6515 November 1990 Indicated by a sideline in the marginBS2922-1:1985 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword i
7、i 1 Scope and field of application 1 2 References 1 3 Definitions 1 4 Principle 1 5 Apparatus and material 1 6 Sampling 1 7 Test pieces 1 8 Procedure 1 9 Expression of results 2 10 Precision 2 11 Test report 2 Publications referred to Inside back coverBS2922-1:1985 ii BSI 11-1999 National foreword T
8、his revision of this British Standard is identical with ISO3689:1983 “Paper and board Determination of bursting strength after immersion in water”, published by the International Organization for Standardization (ISO). It supersedes BS2922-1:1980, which is withdrawn, and was prepared under the direc
9、tion of the Paper Standards Committee. This revision specifies distilled or deionized water in place of drinking water, describes the method of immersion for corrugated fibreboard, details a formula for the expression of the results and includes a number of editorial changes. Terminology and convent
10、ions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used
11、 as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. Additional information. When carrying out this test
12、on material which has been specially treated (for example with urea-formaldehyde) it is essential that care be taken to ensure that sufficient time has elapsed after treatment for the wet strength to be fully developed before soaking the test pieces. If necessary the wet strength development can be
13、accelerated by, for example, heating the test pieces at105 2 C for10min. 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. Compliance with a British Standard does not of itself confer i
14、mmunity from legal obligations. Cross-references International Standards Corresponding British Standards ISO186:1977 BS3430:1980 Method for sampling for testing paper and board (Identical) ISO187:1977 BS3431:1973 Method for the conditioning of paper and board for testing (Technically equivalent) ISO
15、2758:1974 ISO2759:1974 BS3137:1972 Methods for determining the bursting strength of paper and board (Technically equivalent) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, an inside back cover and a back cover. This standard has been updated
16、 (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS2922-1:1985 BSI 11-1999 1 1 Scope and field of application This International Standard specifies a method for the determination of the wet strength of paper and b
17、oard by measuring its bursting strength after it has been immersed in water for a specified period. In principle, the method is applicable to most kinds of paper and board, provided that an appropriate immersion time is agreed between the interested parties. Different results may be found if the sam
18、ple is re-tested after a period of time. 2 References ISO186, Paper and board Sampling for testing. ISO187, Paper and board Conditioning of samples. ISO2758, Paper Determination of bursting strength. ISO2759, Board Determination of bursting strength. 3 Definitions For the purpose of this Internation
19、al Standard, the following definitions apply: 3.1 bursting strength after immersion for X hours the limiting resistance offered by a single sheet of paper or board, after immersion in water for X hours, to a uniformly distributed pressure applied at right angles to its surface up to the point at whi
20、ch it breaks, under the specified conditions of test 3.2 bursting strength retention after immersion for X hours the percentage ratio of the bursting strength of a single sheet of paper or board after immersion in water for X hours to that of the same paper or board in the dry state measured under t
21、he specified conditions of test 4 Principle Immersion in water for the appropriate period of a test piece of the paper or board to be tested and determination of the bursting strength. 5 Apparatus and material 5.1 Burst testing apparatus, complying with the requirements of ISO2758 or ISO2759. 5.2 Th
22、ermostatically controlled water tank, large enough to hold the test pieces in a vertical position. 5.3 Water for soaking Use distilled or deionized water. 6 Sampling Specimens shall be selected in accordance with ISO186. 7 Test pieces 7.1 Preparation Test pieces shall be prepared as specified in ISO
23、2758 or ISO2759. Ten test pieces are normally required for the wet bursting test; if multiple bursting is necessary (see8.3), a larger number of test pieces is required. A duplicate set shall be prepared for the dry bursting test, if required. 7.2 Conditioning For wet testing, conditioning is not ge
24、nerally necessary. If a dry bursting strength test is also required, the test pieces shall be conditioned as specified in ISO187. 8 Procedure 8.1 Immersion Immerse the test pieces, well separated from one another and from the bottom and sides of the tank, in the water(5.3) at one of the temperatures
25、 specified in ISO187 1) , the long side of each test piece being vertical. Immerse the upper edges252mm below the surface of the water. Corrugated fibreboard shall be immersed with the flutes vertical, in order to avoid trapping air which could affect the amount of water absorbed during immersion. A
26、fter immersion for the specified period, remove the test pieces from the water, lightly blot the test pieces to remove surplus water and then immediately test them. 8.2 Immersion times The immersion time used depends on the material and the purpose to which it is to be put and shall be agreed by the
27、 interested parties. Typical immersion times are1h 1 min for papers,2h2min and24h 15min for boards. 1) Preferred temperature:23 1 C.BS2922-1:1985 2 BSI 11-1999 8.3 Determination After immersion of the test pieces, carry out the test in accordance with ISO2758 or ISO2759, unless the bursting strength
28、 after wetting is less than35kPa 2) ; if the paper is weaker, burst sufficient test pieces together to obtain a reading above35kPa. 8.4 Number of tests Carry out five replicate tests with the top side of the paper or board uppermost and five with the wire side uppermost. Repeat with the same number
29、of test pieces if the dry bursting strength is required. 9 Expression of results The results may be expressed as one of the following: a) mean bursting strength, P, in kilopascals, after wetting for X h, given by the formula b) mean burst index after wetting for X h (burst index is defined in ISO275
30、8 and ISO2759); c) mean bursting strength retention after wetting for X h for example, the results as ina) orb) expressed as a percentage of the corresponding mean value in the conditioned state. 10 Precision Insufficient information is available at present to quote details. 11 Test report The test
31、report shall include the following particulars: a) a reference to this International Standard; b) the type of bursting tester used; c) the mean results (in accordance with clause9); d) the minimum and maximum values; e) the immersion time, in hours; f) in the case of multiple sheet testing, the numb
32、er of test pieces used; g) the standard deviation; h) the temperature of the water used for immersion of the test pieces; j) details of any items regarded as optional, or not specified in this International Standard or in the International Standards to which reference is made, and any other features
33、 that may have affected the results. 2) 1kPa=1kN/m 2 1kgf/cm 2 =98,1kPa 1lbf/in 2 =6,89kPa where B is the mean bursting strength, in kilopascals; N is the number of test pieces burst together (see8.3). P B N - =BS2922-1:1985 BSI 11-1999 Publications referred to See national foreword.BS2922-1: 1985 I
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