1、 STDaBSI BS EN IS0 13938-2-ENGL L999 1b24bbS 0809270 412 m BRITISH STANDARD Textiles - Bursting properties of fabrics - Part 2: Pneumatic method for determination of bursting strength and bursting distension I The European Standard EN IS0 139382:1999 has the status of a British Standard ICs 59.080.3
2、0 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN IS0 13938-2:1999 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesBS EN IS0 13938-2:1999 National foreword This British Standard is the English language version of EN IS0 1393821999
3、. It is identical with IS0 139382 1999. Together with BS EN 139381: 1999, it supersedes BS 4768: 1972, which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee TCE4, Physical testmg of textiles, which has the responsibility to: - aid enquirers to understand th
4、e text, - present to the responsible internatio - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is dram to the fact that CEN and CENE
5、LEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section enti
6、tled “International Standards Correspondence Index”, or by using the “l?ind” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a c0nlx-ac.t Users of British Standards are responsible for their correct application. Compl
7、iance 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, the EN IS0 tide page, pages 2 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document
8、 was last issued. This British Standard, having Amendments issued since publication been prepared under the direction of the Sector Amd. No. Chemicals, was published under Committee for Materials and Comments Date Committee and comes into effect the authority of the Standards on 15 November 1999 O B
9、SI 11-1999 ISBN O 580 36390 7 COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesSTD=BSI BS EN IS0 13738-2-ENGL 1997 Lb24bb9 08092$2 295 m EN IS0 1393 - highly expansive; - if the diaphragm is to be used several times, it shall be elastic within the range of hei
10、ght at burst observed during the test. 7 Atmospheres for conditioning and testing The atmospheres for preconditioning, conditioning and testing shall be as specified in IS0 139:1973 Preconditioning and conditioning are not required for wet tests. 8 Procedure 8.1 Prior to testing the sample shall be
11、conditioned in the relaxed state in accordance with clause 7. During testing maintain the test specimens in the atmosphere for conditioning and testing in accordance with clause 7. COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesPage 6 EN IS0 13938-2: 1999 8.
12、2 Set a test area of 50 cm2 (see 6.1.4). NOTE 1 : For most fabrics, particularly knitted fabrics, the test area of 50 cm2 is applicable. For fabrics with low extensibility (known from previous experience or preliminary testing), e.g. for fabrics for technical application, a test area of 100 cm2 is r
13、ecommended. In cases where these conditions cannot be met or are not appropriate, alternative test areas in accordance with 6.1.4 may be used if mutually agreed. NOTE 2 : Comparison of results requires the test to be performed with the same test areas. 8.3 Adjust the control valve of the bursting te
14、ster so that the mean time to distend a test specimen to burst falls within (20 * 5) s. Preliminary trials may be needed to fix the correct setting of the control valve. Time to burst is to be recorded between the beginning of vaulting and the bursting of the test specimen. 8.4 Place the test specim
15、en over the diaphragm so that it lies in a flat tensionless condition, avoiding distortion in its own plane. Clamp it securely in the circular holder, avoiding jaw damage, to prevent slippage during the test. Place the distension recording device into the measuring position and adjust it to the zero
16、 position. Fasten the safety cover in position according to machine requirements. Apply pressure to the test specimen until the fabric bursts. Immediately after burst, close the main air valve. Note bursting pressure and height at burst. If the test specimen bursts close to the edge of the clamping
17、device, record this fact. Reject jaw breaks occurring within 2 mm of the clamping line. Repeat the test at least four more times at different places on the fabric. The number of test specimens may be increased if agreed mutually. 8.5 Diaphragm correction With the same test area and the same setting
18、of the control valve as that employed in the above tests, distend the diaphragm without the presence of a test specimen by an amount equal to the mean height at burst of the test specimen. Note the pressure at this distension of the diaphragm as the “diaphragm pressure“. 0.6 Wet test For tests in th
19、e wet condition, immerse the test specimen for a period of 1 h in grade 3 water in accordance with EN IS0 3696 at a temperature of (20 f 2)“C. For tropical regions temperature according IS0 139: 1973 may be used. An aqueous solution containing not more than 1 g/l of a nonionic wetting agent may be u
20、sed instead of water. Immediately after removal of a test specimen from the liquid and briefly placing it on blotting paper to remove excess water, perform the test according to 8.2 to 8.5. COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesPage 7 EN IS0 13938-2
21、1999 9 Calculation and expression of results 9.1 Calculate the arithmetic mean of the bursting pressure values in kilopascals. From this subtract the diaphragm pressure in kilopascals as determined according to 8.5 to obtain the bursting strength. Round the result to three significant figures. 9.2 C
22、alculate the arithmetic mean of the height at burst .values in.millimetres. Round the result to two significant figures. 9.3 If required, calculate the coefficient of variation and the 95 % confidence limits for the bursting pressure and height at burst. Round the coefficient of variation to the nea
23、rest 0,1% and the 95 % confidence limits in accordance with the mean values. 10 Test report The test report shall include the following information 10.1 General a) The number and year of publication of this standard and date of test; b) identification of test sample and sampling procedure, if requir
24、ed; c) make and model of bursting tester used; a test area used, in square centimetres; e) number of test specimens tested, number of bursts close to clamping device and f) observations of bursting behaviour (e.g. rupture of one or both thread directions); 9) state of test (conditioned or wet); h) a
25、ny deviation from the given procedure. number of tests rejected; 10.2 Test results a) Mean bursting strength, in kilopascals; b) mean height at burst, in millimetres; c) the coefficient of variation of the relevant values, in percent, if required; d) the 95% confidence limits, in units of the releva
26、nt mean values, if required. COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesPage 8 EN IS0 13938-21999 ANNEX A (informative) Selection of testing areas In the absence of a specification for fabric sampling, the example given in figure A.l may be used. 150 mm
27、_z I I i I o I O“ I C- Width of fabric 150 mm - Figure A.1 - Recommended position of testing areas or test specimens. COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesPage 9 EN IS0 13938-211999 Annex ZA (normative) Normative references to International publica
28、tions with their relevant European publications This European Standard incorporates bydated.or.undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent
29、 amendments to or revisions of any of these publications apply to this European standard only when incorporated in it by amendments or revision. For undated references the latest edition of the publication referred to applies. Publication Year Title - EN Year IS0 139 1973 Textiles - Standard atmosph
30、eres for EN 201 39 1992 conditioning and testing COPYRIGHT European Committee for StandardizationLicensed by Information Handling ServicesBS EN IS0 13938-2:1999 BSI 389 Chiswick High Road London W4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing
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