1、BRITISH STANDARD BS 3424-17: 1987 Testing coated fabrics Part 17: Method20. Method for determination of dimensional stability to water immersion IMPORTANT NOTE. It is recommended that this Part be read in conjunction with the information in Part0 “Foreword and general introduction”. UDC 677.077.652:
2、678.066.2:677.017.635.2BS3424-17:1987 This British Standard, having been prepared under the directionof the Rubber StandardsCommittee, was published under the authority ofthe Board of BSI and comes intoeffect on 30 January1987 BSI04-1999 The following BSI references relate to the work on this standa
3、rd: Committee reference RUM/13 Draft for comment85/40620 DC ISBN 0 580 15483 1 Foreword A coated fabric is a composite material comprising a textile structure and a rubber or plastics coating polymer, and as such responds to immersion in cold water in a manner that differs from the response of the t
4、extile element of the composite when not constrained by the coating polymer. The net contraction (orexpansion) over the surface area usually will be considerably less than that of the uncoated textile. Consequently, as the dimensional changes in percentage terms are somewhat lower than with the unre
5、strained textile, it has been found necessary to use a specimen size larger than that used for testing the uncoated textile, so that measured differences after immersion are significant. This Part supersedes method20 of BS3424:1973. A British Standard does not purport to include all the necessary pr
6、ovisions 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 obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2,
7、 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 inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBS3424-17:1987 BSI 04-1999
8、 i Contents Page Foreword Inside front cover 1 Scope 1 2 Principle 1 3 Apparatus and reagents 1 4 Test specimens 1 5 Conditioning 1 6 Test specimen marking 1 7 Measuring 1 8 Test procedure 1 9 Calculation and expression of results 2 10 Test report 2 Figure 1 Position of marks on test specimen 2 Publ
9、ication referred to Inside back coverii blankBS3424-17:1987 BSI 04-1999 1 1 Scope This Part of BS3424 describes a method for determining the dimensional stability of a coated fabric, to immersion in cold water. NOTEThe title of the publication referred to in this standard is given on the inside back
10、 cover. 2 Principle A specimen of coated fabric is conditioned, measured, soaked, dried, reconditioned and remeasured. The dimensional changes so obtained are expressed as percentage values of the original dimensions. 3 Apparatus and reagents 3.1 Watertight tray or container approximately100mm deep
11、and of sufficient size to contain the test specimen horizontally without folding. 3.2 A steel rule at least1m in length, preferably with an engraved, bevelled edge, marked in millimetres. 3.3 Suitable means of marking reference points, for example: a) indelible ink marker; b) fine threads of a colou
12、r contrasting with that of the test specimen; c) staples. 3.4 A flat surface of sufficient size to enable the test specimen to be laid flat. 3.5 Two transparent glass or acrylic plates, each measuring not less than600mm 600mm. 3.6 Means for maintaining the standard atmosphere for conditioning specif
13、ied in BS3424-2. 3.7 A wetting agent such as sodium oleate or sodium dioctyl sulphosuccinate. 4 Test specimens Cut one test specimen not less than600mm 600mm with two sides parallel to the longitudinal direction of the roll, avoiding the first and last metre of the roll. 5 Conditioning Conditioning
14、shall be carried out in the atmosphere specified in method4 (i.e.BS3424-2). 6 Test specimen marking Place the test specimen on the flat surface(3.4) and make not fewer than three pairs of marks on the textile substrate side of a single face coated fabric or on both sides of a double texture coated f
15、abric, in both the longitudinal and transverse directions, using a suitable means of marking(3.3). The distance between the two marks in each pair shall be not less than450mm and no mark shall be less than50mm from the edges of the test specimen. The pairs of marks shall be displaced from each other
16、 in such a manner as to yield a representative measure of the whole test specimen (seeFigure 1). If staples are employed to mark the test specimen, measurements shall be made from the point of entry into the test specimen and indications made on the test specimen which end of the staple is used for
17、measurement. 7 Measuring Lay the conditioned test specimen, free from tension, on one of the plates(3.5) and place the other plate over the test specimen. Measure and record the distances between corresponding reference marks to the nearest millimetre, taking care to avoid parallax errors. 8 Test pr
18、ocedure Soak the measured test specimen, lying flat, for2h in the tray or container(3.1) containing a0.2% solution of a wetting agent(3.7), in distilled water at20 5 C or as required by the performance specification. Ensure that the depth of liquid above the specimen is at least25mm. If necessary ke
19、ep the test specimen submerged, for example by use of small weight pieces, ensuring that these are as small as possible. After2h pour off the liquid and remove the test specimen, without distortion, from the tray, and place it flat on a towel. Remove excess moisture by lightly pressing another towel
20、 on top of the specimen. Allow the test specimen to dry, unrestrained, on a horizontal flat surface at a temperature of20 5 C. Condition the test specimen in the atmosphere specified in method4 of BS3424-2 until it reaches equilibrium regain. Carefully replace the test specimen between the plates(3.
21、5). Measure and record the distances between corresponding reference marks on the test specimen to the nearest millimetre.BS3424-17:1987 2 BSI 04-1999 9 Calculation and expression of results 9.1 Calculate the mean percentage dimensional change in the longitudinal direction, L, using the following eq
22、uation: where 9.2 Calculate the mean percentage dimensional change in the transverse direction, T, using the following equation: where 10 Test report The test report shall include the following information: a) the description of the coated fabric; b) the mean percentage dimensional change in the lon
23、gitudinal direction; c) the mean percentage dimensional change in the transverse direction; d) the temperature of the water during immersion as described in clause8; e) a reference to this method of test, i.e.method20 of BS3424-17; f) any deviations from the standard test procedure. Figure 1 Positio
24、n of marks on test specimen L 1 is the mean of the original distances between the gauge marks in the longitudinal direction, i.e.distances (inmm)(see Figure 1); L 2 is the mean of the distances between the same marks in the longitudinal direction after completing the test procedure in clause8 (in mm
25、). L L 2 L 1 ()100 L 1 - = ABCDEF + + () 3 - T T 2 T 1 ()100 T 1 - = T 1 is the mean of the original distances between the reference marks in the transverse direction, i.e.distance (in mm) (seeFigure 1); T 2 is the mean of the distances between the same reference marks in the transverse direction af
26、ter completing the test procedure in clause8 (in mm). AEGHBF + + () 3 -BS3424-17:1987 BSI 04-1999 Publication referred to BS3424, Testing coated fabrics. BS3424-2:Method4, Conditioning and selection of test specimens. BS3424-17: 1987 BSI 389 Chiswick High Road London W4 4AL BSI BritishStandardsInsti
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