DIN EN ISO 13938-2-1999 Textiles - Bursting properties of fabrics - Part 2 Pneumatic method for determination of bursting strength and bursting distension (ISO 13938-2 1999) German.pdf

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1、DEUTSCHE NORM October 1999 Texti I es Part 2: Pneumatic method for determination of bursting strength and bursting distension (IS0 13938-2 : 1999) English version of DIN EN IS0 13938-2 DIN - Bursting properties of fabrics EN IS0 13938-2 ICs 59.080.30 This standard, together with October 1999 edition

2、, supersedes DIN 53861 -1, November 1992 edition, and DIN 53861-2, March 1978 edition. DIN EN IS0 13938-1, Textilien - Bersteigenschaften von textilen Flchengebilden - Teil 2: Pneumatisches Verfahren zur Bestimmung von Berstdruck und Berstwlbung (IS0 13938-2 : 1999) European Standard EN IS0 13938-2

3、: 1999 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been prepared by CEN/TC 248. The responsible German body involved in its preparation was the Normenausschu Materialprfung (Materials Testing Standards Committee), Technical Committee P

4、hysikalisch-technologische Prf- verfahren fr Textilien. The DIN Standards corresponding to the European and International Standards referred to in clause 2 of the EN are as follows: EN IS0 3696 IS0 139 EN 3001 2-1 DIN IS0 1 O01 2-1 DIN IS0 3696 DIN EN 201 39 Amendments DIN 53861 -1, November 1992 ed

5、ition, and DIN 53861 -2, March 1978 edition, have been superseded by the specifications of EN IS0 13938-2, which is identical to IS0 13938-2. Previous editions DIN 53801 -4: 1937-01 DIN 53861 -1 : 1958-08, 1970-08, 1992-1 1 DIN 53861 -2: 1970-08, 1978-03. National Annex NA Standard referred to (and

6、not included in Normative references and Annex ZA) DIN EN 201 39 Textiles - Standard atmospheres for conditioning and testing EN comprises 8 pages. No pari of this standard may be reproduced without the prior permission of Ref. No. DIN EN IS0 13938-2 : 1999-1 V Deutsches Institut fur Normung e. V.,

7、Berlin. Luth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). English price group 06 Sales No. 11 06 03.00 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 13938-2 August 1999 ICs 59.080.30 English version Text i I es Part 2: Pneumatic method fo

8、r determination of bursting strength and bursting distension Bursting properties of fabrics (IS0 13938-2 : 1999) Textiles - Proprits de rsistance Textilien - Bersteigenschaften von lclatement des toffes - Partie 2: Mthode pneumatique pour la dtermination de la rsistance et de la dformation lclatemen

9、t textilen Flchengebilden -Teil 2: Pneumatisches Verfahren zur Bestimmung von Berstdruck und Berstwlbung (IS0 13938-2 : 1999) (IS0 13938-2 : 1999) This European Standard was approved by CEN on 1998-1 2-06. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the c

10、onditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in thr

11、ee official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Au

12、stria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr

13、Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1999. CEN - All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN IS0 13938-2 : 1999 E Page 2 EN IS0 13938-2 : 1999 Foreword International Standard IS0 13938-2 : 1999 Textile

14、s - Bursting properties of fabrics - Part 2: Pneumatic method for determination of bursting strength and bursting distension, which was prepared by ISO/TC 38 Textiles of the International Organization for Standardization, has been adopted by Technical Committee CEN/TC 248 Textiles and textile produc

15、ts, the Secretariat of which is held by BSI, as a European Standard. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by February 2000 at the latest. In accordance with

16、 the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal

17、, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard IS0 13938-2 : 1999 was approved by CEN as a European Standard without any modification. NOTE: Normative references to international publications are listed in Annex ZA (normative). Page 3 E

18、N IS0 13938-2 : 1999 1 Scope This standard describes a pneumatic pressure method for the determination of bursting strength and bursting distension of textile fabrics. NOTE : EN IS0 13938-1 describes a method using hydraulic pressure. The method is applicable to knitted, woven, nonwoven and laminate

19、d fabrics. It may be suitable for fabrics produced by other techniques. The test is suitable for test specimens in either the conditioned or wet state. From the available data there appears to be no significant difference in the bursting strength results achieved using hydraulic or pneumatic burst t

20、esters, for pressures up to 800 kPa. This pressure range covers the majority of performance levels expected of general apparel. For speciality textiles requiring high bursting pressures, the hydraulic apparatus is more suitable. 2 Normative references The following normative documents contain provis

21、ions which, through reference in this text, constitute provisions of this pari of this International Standard dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to inv

22、estigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IS0 and IEC maintain registers of curently valid International Standards. IS0 139:1973 Textil

23、es - Standard atmospheres for conditioning and testing EN IS0 3696 Water for analytical laboratory use - Specification and test methods (IS0 3696: 1987) EN 30012-1 :i 993 Quality assurance requirements for measuring equipment - Part 1 :Metrological confirmation system for measuring equipment (IS0 1

24、O01 2-1 1992) 3 Definitions For the purposes of this standard the following definitions apply: 3.1 test area: Area of the test specimen within the circular clamping device. 3.2 bursting pressure (pressure at burst): Maximum pressure applied to a test specimen clamped over an underlying diaphragm unt

25、il the test specimen ruptures. 3.3 bursting strength (strength at burst): Pressure obtained by subtracting the diaphragm pressure from the mean bursting pressure. 3.4 diaphragm pressure: Pressure applied to the diaphragm, with no test specimen present, to distend it to the mean bursting distension o

26、f the test specimen. Page 4 EN IS0 13938-2 : 1999 3.5 bursting distension (distension at burst): Expansion of a test specimen at the bursting pressure. It is expressed as height at burst. 3.6 height at burst: Distance between the upper surface of the test specimen before distension and the top of th

27、e test specimen at the bursting pressure. 3.7 time to burst: Time taken to distend a test specimen to burst. 4 Principle A test specimen is clamped over an expansive diaphragm by means of a circular clamping ring. Increasing compressed air pressure is applied to the underside of the diaphragm, causi

28、ng distension of the diaphragm and the fabric. The pressure is increased smoothly until the test specimen bursts. The bursting strength and bursting distension are determined. 5 Sampling Either select samples in accordance with the procedure laid down in the material specification for the fabric, or

29、 as agreed between the interested parties. In the absence of an appropriate material specification an example of a suitable sampling procedure is given in annex A. Avoid areas that are folded or creased, selvedges and areas not representative of the fabric. The system of clamping used generally perm

30、its tests to be applied without cutting out test specimens. 6 Apparatus 6.1 Bursting tester Metrological confirmation of the bursting tester shall be carried out in accordance with EN 3001 2-1 11 993. The bursting tester shall comply with the following requirements: 6.1.1 The apparatus shall be capa

31、ble of producing an increase in air pressure to achieve a testing time to burst of (20 15) s. To achieve responsive adjustment of the air velocity, an indicating control valve is needed in addition to the main air valve of the apparatus. 6.1.2 Bursting pressure shall be indicated with an accuracy of

32、 + 2 % of full scale range above the first 20 % of range. 6.1.3 Height at burst up to 70 mm shall be indicated with an accuracy of 11 mm. Zero position of the measuring gauge shall be adjustable to accommodate the thickness of the test specimen. 6.1.4 A test area of 50 cm2 (79,8 mm diameter) shall b

33、e used. Page 5 EN IS0 13938-2 : 1999 Other test areas of 1 O0 cm2 (1 12,8 mm diameter) or 1 O cm2 (357 mm diameter) or 7,3 cm2 (30.5 mm diameter) may be used, if the preferred test area is not applicable in the existing testing equipment or due to high or low expansion of the fabric or other fabric

34、requirements, or by mutual agreement. 6.1.5 The clamping device shall provide for clamping of the test specimen securely without distortion or damage and prevent slippage during the test. The clamping ring shall allow undisturbed vaulting of highly expansive fabrics (e.g. fabric test specimens whose

35、 height at burst is greater than half of the test specimen diameter). All test specimen clamping ring inner diameters shall be accurate to 10,2 mm. To avoid test specimen damage a small curvature at the inner edge of the clamping ring facing the test specimen is recommended. 6.1.6 A safety cover sha

36、ll enclose the clamping device during the test when the expansion of the test specimen takes place. It shall allow clear observation of the expansion of the test specimen during the test. 6.1 -7 The diaphragm shall meet the following requirements: - thickness up to 2 mm; - highly expansive; - if the

37、 diaphragm is to be used several times, it shall be elastic within the range of height 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 ar

38、e not required for wet tests. 8 Procedure 8.1 Prior to testing the sample shall be 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. Page 6 EN IS0 13938-2 : 1999 8.2 Set

39、 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 cm* is recomm

40、ended. 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 tester

41、so that the mean time to distend a test specimen to burst falls within (20 f 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 specimen ov

42、er 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 posi

43、tion. 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 devic

44、e, 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 of th

45、e 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“. 8.6 Wet test For tests in the wet

46、 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 used i

47、nstead 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. Page 7 EN IS0 13938-2 : 1999 9 Calculation and expression of results 9.1 Calculate the arithmetic mean of the burst

48、ing 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. Round the result

49、 to two significant figures. 9.3 If required, calculate the coefficient of variation and the 95 Yo confidence limits for the bursting pressure and height at burst. Round the coefficient of variation to the nearest 0,1% and the 95 o/o confidence limits in accordance with the mean values. 1 O Test report The test report shall include the following information 10.1 General The number and year of publication 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,