1、 STD-BSI BS EN IS0 13738-1-ENGL 1977 m 1624667 0807277 T89 E BRITISH STANDARD Textiles - Bursting properties of fabrics - Part 1: Hydraulic method for determination of bursting strength and bursting distension The European Standard EN IS0 139381: 1999 has the status of a British Standard ICs 59.080.
2、30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGH LAW BS EN IS0 13938-1:1999 BS EN IS0 1393 - present to the responsible intemationaVEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related international
3、 and European developments and promulgate them in the UK. A ist of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which iists normative references to int
4、emational 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 entitled “international Standards Correspondence Index”, or by using the “Find” faci
5、lity of the BSI Standards Electronic Caalogue. A British Standard does not purport to include all the necessary provisions of a conixact Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligati
6、ons. Summary of pages This document comprises a front cover, an inside front cover, the EN IS0 title page, pages 2 to 10, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. STD-BSI BS EN IS0 13938-1-ENGL I999 EUROPE
7、AN STANDARD NORME EUROPENNE EUROPISCHE NORM Lb24669 0807279 851 EN IS0 1393 - highly expansive; - if the diaphragm is to be used several times, it shall be elastic within the range of height at burst observed during the test; - resistant against pressurizing fluids used. Page 6 EN IS0 13938-11999 7
8、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 conditioned in the relaxed state in acco
9、rdance with clause 7. During conditioning and testing maintain the test specimens in the atmosphere for conditioning and testing in accordance with clause 7. 8.2 Set a test area of 50 cm2 (see 6.1.5). NOTE 1 : For most fabrics, particularly knitted fabrics, the test area of 50 cm2 is applicable. For
10、 fabrics with low extensibility (known from previous experience or preliminary testing), e.g. for fabrics for technical application, a test area of 1 O0 cm2 is recommended. In cases where these conditions cannot be met or are not appropriate alternative test areas in accordance with 6.1.5 may be use
11、d if mutually agreed. NOTE 2 : Comparison of results requires the test to be performed with the same test areas and rates of increase in volume. 8.3 Set a constant rate of increase in volume of between 100 cm3/min and 500 cm3/min depending on test area and fabric requirements. Or adjust a time to di
12、stend a test specimen to burst of (20 15) s using preliminary trials, if a constant rate of increase in volume is not applicable. 8.4 Place the test specimen over the diaphragm so that it lies in a flat tensionless condition, avoiding distortion in its own plane. Clamp it securely in the circular ho
13、lder, avoiding jaw damage, to prevent slippage during the test. Place the distension recording device into the measuring position and adjust it to the zero position. Fasten the safety cover in position according to machine requirements. Apply pressure to the test specimen until the fabric bu rs t s.
14、 Immediately after burst, reverse the apparatus to starting position. Note bursting pressure and height at burst and/or bursting volume. If the test specimen bursts close to the edge of the clamping device, report this fact. Reject jaw breaks occurring within 2 mm of the clamping line. Repeat the te
15、st 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 rate of increase in volume or time to burst as that employed in the above tests, distend the diaphragm without the pre
16、sence of a test specimen by an amount equal to the mean height at burst or the mean volume at burst of the test specimen. Note the pressure at this distension of the diaphragm as the “diaphragm pressure“. STD=BSI BS EN IS0 1393B-L-ENGL 2999 = lb24bb9 0809285 U55 Page 7 EN IS0 13938-1 11 999 8.6 Wet
17、test For tests in the wet condition, immerse the test specimen for a period of 1 h in grade 3 water in accordance with EN IS0 3696:1995 at a temperature of (20 12) C. For tropical regions, temperature according to IS0 139:1973 may be used. An aqueous solution containing not more than 1 g of a nonion
18、ic wetting agent per litre may be used 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 ihe test according lo 8.2-to 8.5. 9 Calculation and expression of results 9.1 Calculate the arithmetic mean o
19、f 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 Calculate the arithmetic mean of the height at burst values in millimetres. Roun
20、d the result to two significant figures. 9.3 If required, calculate the arithmetic mean of the volume at burst values in cubic centimetres. Round the result to three significant figures. 9.4 If required, calculate the coefficient of variation and the 95 % confidence limits for the bursting pressure
21、and height at burst and, if required, volume at burst. Round the coefficient of variation to the nearest 0,l YO and the 95 YO confidence limits in accordance with the mean values. Page 8 EN IS0 13938-1 1999 1 O Test report The test report shall include the following information 10.1 General The numb
22、er and year of publication of this part of this standard and date of test; identification of test sample and sampling procedure, if required; make and model of bursting tester used; test area used, in square centimetres; rate of increase in volume or time to burst; number of test specimens tested an
23、d number of bursts close to clamping device and number of tests rejected; observation of bursting behaviour (e.g. rupture of one or both thread directions); state of test (conditioned or wet); any deviation from the given procedure. 10.2 Test results a) b) c) d) e) Mean bursting strength, in kilopas
24、cals; mean height at burst, in millimetres; mean volume at burst, in cubic centimetres, if required; the coefficient of variation of the relevant values, in percent, if required; the 95% confidence limits, in units of the relevant mean values, if required. STD-BSI BS EN IS0 L3938-L-ENGL 1999 H Lb24b
25、b9 0809287 928 W Page 9 EN IS0 13938-1 :1999 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. Figure A.l - Recommended position of testing areas or test specimens STD.BSI ES EN IS0 L3938-L-ENGL 1999 L
26、b24bb9 OO2AJ 8b4 m Page 10 EN IS0 13938-1 : 1999 Annex ZA (normative) Normative references to International publications with their relevant European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cit
27、ed at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply btohisEucopean standard only when incorporated in it by amendments or revision. For undated references the latest edition
28、 of the publication referred to applies. Publication EN - IS0 139:1973 Textiles - Standard atmospheres EN 201 39 1992 for conditioning and testing STD.BSI BS EN IS0 13938-1-ENGL 1999 W Lb24669 0809289 7T0 BS EN IS0 13938-1 : 1999 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Insti
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