1、BRITISH STANDARD BS 4736:1985 ISO 7771:1985 Method for Determination of dimensional changes of fabrics induced by cold-water immersion ISO title: Textiles Determination of dimensional changes of fabrics induced by cold-water immersion UDC 677.074.017.635:620.192.5BS4736:1985 This British Standard, h
2、aving been prepared under the directionof the Textiles and Clothing Standards Committee, was published underthe authorityof the BoardofBSI andcomes intoeffecton 31October 1985 BSI 07-1999 First published March 1971 First revision October 1985 The following BSI references relate to the work on this s
3、tandard: Committee reference TCM/25 Draft for comment 83/39392 DC ISBN 0 580 14661 8 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/25 upon which the following
4、 bodies were represented: Association of Manufacturers of Domestic Electrical Appliances British Interlining Manufacturers Association Consumers Association Home Laundering Consultative Council International Institute for Cotton International Wool Secretariat Man-made Fibres Producers Committee Manc
5、hester Testing House Ministry of Defence Soap and Detergent Industry Association Textile Research Council Amendments issued since publication Amd. No. Date of issue CommentsBS4736:1985 BSI 07-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and field of app
6、lication 1 2 References 1 3 Definition 1 4 Principle 1 5 Apparatus and reagents 1 6 Conditioning and testing atmospheres 1 7 Test specimens 1 8 Test procedure 2 9 Expression of results 2 10 Test report 2 Figure 1 Measurement points for marking the specimen from wide fabrics 3 Figure 2 Marking of spe
7、cimens 4 Publications referred to Inside back coverBS4736:1985 ii BSI 07-1999 National foreword This British Standard has been prepared under the direction of the Textiles and Clothing Standards Committee and forms a revision of the first edition published in 1971 which is withdrawn. This standard i
8、s identical with ISO 7771 “Textiles Determination of dimensional changes of fabrics induced by cold-water immersion”, published in1985 by the International Organization for Standardization (ISO). Terminology and conventions. The text of the international standard has been approved as suitable for pu
9、blication 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 as a decimal marker. In British Standards it is current practice to use a full p
10、oint on the baseline as the decimal marker. Wherever the words “International Standard” appear referring to this standard, they should be read as “British Standard”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible
11、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 ISO 139:1973 BS 1051:1981 Glossary of terms relating to the conditioning, testing and mass determination
12、 of textiles (Technically equivalent a ) ISO 3759:1984 BS 4931:1973 Procedure for the preparation, marking and measuring of fabric specimens and garments in tests for assessing dimensional change (Technically equivalent) a This British Standard glossary contains all the relevant information which, i
13、n the international standard, is written in terms of requirements. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorp
14、orated. This will be indicated in the amendment table on the inside front cover.BS4736:1985 BSI 07-1999 1 1 Scope and field of application This International Standard specifies a method for determination of the dimensional changes that occur when a fabric is subjected to immersion in cold water with
15、out agitation, and dried. It is applicable to fabrics which, in use, are subjected to cold water without agitation. 2 References ISO 139, Textiles Standard atmospheres for conditioning and testing. ISO 3759, Textiles Preparation, marking and measuring of fabric specimens and garments in tests for de
16、termination of dimensional change. 3 Definition For the purposes of this International Standard, the following definition applies. dimensional change the change in dimensions taking place in either the lengthways or widthways direction when a specimen is soaked and dried without agitation under the
17、prescribed conditions 4 Principle The specimen is cut from the sample and, after conditioning, is measured, soaked, dried under the prescribed conditions, reconditioned and remeasured. The dimensional changes are calculated in the lengthways and/or widthways directions. 5 Apparatus and reagents 5.1
18、Watertight tray or container, approximately100mm deep and of sufficient area to contain the specimen horizontally without folding. 5.2 Steel rule, graduated in millimetres. 5.3 Means of marking reference points on the specimen, as described in ISO3759. 5.4 Plate glass, two pieces each measuring at l
19、east600mm 600mm and approximately6mm thick. 5.5 Means of producing and maintaining the standard atmosphere for testing textiles specified in clause6. 5.6 Sodium hexametaphosphate or sodium triphosphate 5.7 Efficient wetting agent 1) 6 Conditioning and testing atmospheres Conditioning and testing sha
20、ll be carried out according to ISO139. 7 Test specimens 7.1 Number of specimens Test at least one specimen taken from wide fabrics as specified in7.2 and at least three specimens of narrow fabrics as specified in7.3. 7.2 Specimens from wide fabrics Cut each specimen at least500mm 500mm, free from cr
21、eases, with the edges parallel to the lengthways and widthways directions respectively. Do not take any specimen within1m of either end of the piece and do not include selvedges. For knitted fabrics, make up the specimens in double thickness, the free edges being sewn together with dimensionally sta
22、ble thread. When fabrics with fancy weave structures are being tested, ensure as far as possible that exact numbers of repeats are taken in each test specimen. Mark on the specimen three pairs of reference points in each direction (lengthways and widthways) with 350 mm between points that comprise a
23、 pair (seeFigure 1). No reference point shall be nearer than35mm to the edge of the specimen. 7.3 Specimens from narrow fabrics Cut each specimen full width and at least450mm in length. Do not take any specimen within1m of either end of the piece. Mark each specimen with one or more pairs of referen
24、ce points according to fabric width as set out inFigure 2. Ensure that each point is approximately50mm from the end of the specimen. 7.4 Means of marking specimens Specimens shall be marked according to the procedure in ISO3759. 7.5 Conditioning Expose the specimen to the standard atmosphere for tes
25、ting textiles for not less than12h. 7.6 Measuring Lay the conditioned specimen free from tension on one of the pieces of plate glass (5.4) and place the other piece of plate glass over the specimen. Measure and record the distances between corresponding reference points to the nearest millimetre, ta
26、king care to avoid parallax errors. 1) For example: sodium di-octyl sulpho-succinate or dodecyl benzene sodium sulphonate.BS4736:1985 2 BSI 07-1999 8 Test procedure 8.1 Soak the measured specimen, lying flat, for2h in the tray or container (5.1) containing water to which has been added0,5g/l of the
27、efficient wetting agent (5.7) (calculated on active matter content). The water shall be at a temperature between15 and20C. The water should be of zero hardness or, alternatively, of not more than5 parts/100000 of calcium carbonate hardness to which sodium hexametaphosphate (5.6) has been added at th
28、e rate of0,08g/l per1 part/100000 of calcium carbonate. Ensure that the depth of liquid above the specimen is at least25mm. If necessary, keep the specimen submerged, for example by use of small weight pieces, ensuring that these are as small as possible. 8.2 After 2 h, pour off the liquid and remov
29、e the specimen without distortion from the tray and place it flat on a towel. In this process, care is necessary in handling the specimen. The most convenient method is to fold the corners to the centre so that the whole specimen is supported when lifted onto the towel. Remove excess moisture by lig
30、htly pressing another towel on top of the specimen. 8.3 Lay the specimen on a smooth flat surface and allow it to dry at a temperature of20 5C. NOTEFor thick, absorbent fabrics an excessive drying time may be required. Dry using any other convenient means, e.g. an open rack, and record the drying me
31、ans used in the test report. 8.4 Condition the specimen in the standard atmosphere for testing textiles until it reaches equilibrium and measure the distances between corresponding reference points as specified in7.6. 9 Expression of results Calculate the percentage change of each individual dimensi
32、on and the mean percentage dimensional change in each direction. Record the mean dimensional changes to the nearest0,1%. 10 Test report The test report shall include the following information: a) a statement that the procedure was conducted in accordance with this International Standard; b) whether
33、the specimens were from wide or narrow fabrics and the number tested; c) the mean percentage change in dimensions in the lengthways and widthways directions for wide fabrics, and in the lengthways direction for narrow fabrics. Use a positive sign to indicate extension and a negative sign to indicate
34、 shrinkage; d) details of any deviation from the specified procedure.BS4736:1985 BSI 07-1999 3 Figure 1 Measurement points for marking the specimen from wide fabricsBS4736:1985 4 BSI 07-1999 Figure 2 Marking of specimensBS4736:1985 BSI 07-1999 Publications referred to See national foreword.BS 4736:1
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