1、BRITISH STANDARD BS 4682-2: 1988 Methods of test for Dimensional stability of textile floor coverings Part 2: Determination of dimensional changes due to changes in ambient humidity UDC 677.07:645.13:677.017.4:620.171.33:677.017.635BS4682-2:1988 This British Standard, having been prepared under the
2、directionof the Textiles and Clothing Standards Committee,was published underthe authority of the BoardofBSI and comes into effect on 30December1988 BSI 10-1999 First published June 1972 First revision December 1988 The following BSI references relate to the work on this standard: Committee referenc
3、e TCM/27 Draft for comment 87/38832 DC ISBN 0 580 16939 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Textiles and Clothing Standards Committee (TCM/-) to Technical Committee TCM/27, upon which the following bodies were represented:
4、British Carpet Manufacturers Association Ltd. British Polyolefin Textiles Association City of Bradford Conditioning House Carpet Cleaners Association Crown Suppliers Fibre Bonded Carpet Manufacturers Association International Wool Secretariat London Institute Man-made Fibres Producers Committee Nati
5、onal Institute of Carpet Fitters Textile Research Council Amendments issued since publication Amd. No. Date of issue CommentsBS4682-2:1988 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Apparatus 1 4 Sampling and specimen preparation 1 5 P
6、rocedure 1 6 Calculation and expression of results 1 7 Test report 2 Figure 1 Marking of specimen 2 Publications referred to Inside back coverBS4682-2:1988 ii BSI 10-1999 Foreword This Part of BS4682 has been prepared under the direction of the Textiles and Clothing Standards Committee and is a revi
7、sion of BS4682-2:1972, which is withdrawn. In this revision the humidity range of the test atmospheres and the specimen presentation have been modified and simplified. Changes in relative humidity occur frequently in homes and can give rise to changes in dimensions of textile floor coverings. Dimens
8、ional instability of textile floor coverings manifests itself in the form of shrinkage, extension or rucking. This Part of BS4682 allows accurate determinations to be made of dimensional changes of the order of0.1%. BS4682-3 and4682-4 describe methods for the determination of changes due to exposure
9、 to heat and immersion in water respectively. 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 immunity from legal obligati
10、ons. 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 incorporated. This will be indicated in the amendment table on the in
11、side front cover.BS4682-2:1988 BSI 10-1999 1 1 Scope This Part of BS4682 describes a method for the determination of dimensional changes of all types of machine-made textile floor coverings due to changes in ambient humidity at constant temperature. NOTEThe titles of the publications referred to in
12、this standard are listed on inside back cover. 2 Principle A measured specimen is allowed to condition for specified periods of time in different ambient humidities. Any consequent changes in dimensions in each direction are determined. 3 Apparatus 3.1 Mounting boards, at least two, flat and of the
13、same material as the baseboard(3.5) and measuring at least50mm more than the specimen in each direction. 3.2 Means for providing controlled environments with atmospheres with relative humidities of25 5%,65 2% and75 5% all at20 2 C. NOTEInformation on the provision of these atmospheres is given in th
14、e following texts. OBrien, F.E.H. Journal of Scientific I instruments, 1948,9 March,73 Young, J.F. Journal of Applied Chemistry, 1967,17,241 3.3 Humidity-measuring instrument, accurate to2% relative humidity. 3.4 Temperature-measuring instrument, accurate to1 C. 3.5 Measuring apparatus, comprising a
15、 rigid baseboard accommodating four dial gauge micrometers and metal squares for calibration of the gauge positions as described in BS5920. 4 Sampling and specimen preparation 4.1 Material in roll form Take samples and select at least two test specimens measuring not less than500mm 500mm in accordan
16、ce with BS4664 and mark the direction of manufacture. 4.2 Pre-cut carpet tiles For tiles measuring up to600mm 600mm, select at least two whole tiles as test specimens that are representative of the bulk. For larger tiles, treat them as material in roll form and select the test specimens in accordanc
17、e with4.1. Whenever possible, identify the direction of manufacture and make all measurements with respect to this. 4.3 Markings Identify and mark the sides of each specimen as shown in Figure 1 and also mark the direction of manufacture if this is identifiable. If the direction of manufacture canno
18、t be identified, make an arbitrary identification of direction. 5 Procedure 5.1 Using one mounting board(3.1) for each specimen, place the specimens use-surface uppermost successively in the conditioning atmospheres described in5.2. Allow the required conditioning period to elapse. Measure the relat
19、ive humidity of the conditioning atmosphere to an accuracy of2%(3.3) and the temperature to an accuracy of1C(3.4) and, using the mounting boards for moving the specimens, measure the dimensions of the specimens(3.5) either in the conditioning atmosphere or immediately after removal from it. NOTEIf t
20、he working arrangement does not permit the immediate measurement of the specimen dimensions at the end of a stated conditioning period, the specimens may be left in that conditioning atmosphere until measurement is possible. Measure the dimensions of the specimens, substrate upper-most, to the neare
21、st0.1mm in accordance with BS5920 and record the mean of the two values for each direction. Identify the direction of manufacture as L and that at right angles to it as W. 5.2 Make measurements after each stage of the following sequence of conditioning atmospheres: a) relative humidity65 2%, tempera
22、ture20 2 C for at least24h (dimensions L 1and W 1 ); b) relative humidity25 5%, temperature20 2 C for48h (dimensions L 2and W 2 ); c) relative humidity755%, temperature20 2 C for48h (dimensions L 3and W 3 ); and d) relative humidity255%, temperature20 2 C for48h (dimensions L 4and W 4 ). 6 Calculati
23、on and expression of results 6.1 Calculate the linear changes (in%) in the direction of manufacture %L and of width %W of the marked specimens due to changes in relative humidity from a) 255% to755%; and b) 755% to255% as a percentage of length or width at65% relative humidity.BS4682-2:1988 2 BSI 10
24、-1999 Thus, for the direction of manufacture use the equations 1) 1) where L 1 , L 2 , L 3and L 4are as given in5.2. 6.2 Assuming that changes in dimensions are directly proportional to changes in relative humidity, convert changes in dimensions for each change in relative humidity to percentage lin
25、ear change per50% relative humidity change L c(in%) from the equation 7 Test report The test report shall include the following information: a) a statement that the test procedure was conducted in accordance with this Part of BS4682, i.e.BS4682-2:1988; b) the relative humidity and temperature of all
26、 atmospheres to which the specimens were exposed, the method by which the atmospheres were controlled and the accuracy to which they were controlled; c) the percentage linear changes in the direction of manufacture and of width of the specimens calculated in accordance with6.1 and6.2 and expressed u
27、sing a negative sign () for shrinkages and a positive sign(+) for extensions. where %L is the linear change calculated in accordance with6.1 (in%); %L L 3 L 2 L 1 - 100; = %L L 4 L 2 L 1 - 100; = L c %L50 %R - = %R is the change in relative humidity (in%). Figure 1 Marking of specimenBS4682-2:1988 B
28、SI 10-1999 Publications referred to BS 4664, Methods for sampling and cutting specimens of textile floor coverings for physical tests. BS 4682, Methods of test for dimensional stability of textile floor coverings. BS 4682-3, Determination of dimensional changes after exposure to heat 1) . BS 4682-4,
29、 Determination of dimensional changes after immersion in water 1) . BS 5920, Method for determination of dimensions of textile floor covering test specimens. OBrien, F.E.H. Journal of Scientific Instruments, 1948,9March,73. Young, J.F. Journal of Applied Chemistry, 1967,17,241. 1) Referred to in the
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