1、BRITISH STANDARD BS EN ISO 13938-2:1999 Textiles Bursting properties of fabrics Part2: Pneumatic method for determination of bursting strength and bursting distension The European Standard EN ISO13938-2:1999 has the status of a BritishStandard ICS 59.080.30BSENISO13938-2:1999 This BritishStandard, h
2、aving been prepared under the directionof the Sector Committeefor Materials andChemicals, was published under the authorityof the Standards Committee and comesinto effecton 15November1999 BSI04-2000 ISBN 0 580 35390 7 National foreword This BritishStandard is the English language version of EN ISO13
3、938-2:1999. It is identical with ISO13938-2:1999. Together with BSEN13938-1:1999, it supersedes BS4768:1972, which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee TCI/24, Physical testing of textiles, which has the responsibility to: aid enquirers to unders
4、tand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on t
5、his 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 lists normative references to international publications with their corresponding European publications. The BritishStandards whic
6、h 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” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include al
7、l the necessary provisions 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, pagesi andi
8、i, theEN ISO title page, pages2 to6, 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 Comment
9、sBSENISO13938-2:1999 BSI 04-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN ISO13938-2 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO13938-2 August1999 ICS 59.080.30 English version Textiles Bursting properties of fabrics Part2:Pneumatic method for
10、determination of bursting strength and bursting distension (ISO13938-2:1999) Textiles Proprits de rsistance lclatement des toffes Partie2: Mthode pneumatique pour la dtermination de la rsistance et de la dformation lclatement (ISO13938-2:1999) Textilien Bersteigenschaften von textilen Flchengebilden
11、 Tell2: Pneumatisches Verfahren zur Bestimmung von Berstdruck und Berstwlbung (ISO13938-2:1999) This European Standard was approved by CEN on6December1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the s
12、tatus 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. This European Standard exists in three official versions (English, French, German).
13、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 Austria, Belgium, CzechRepublic, Denmark, Finland,
14、 France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussel
15、s 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO13938-2:1999EENISO13938-2:1999 BSI 04-2000 2 Foreword The text of EN ISO13938-2:1999 has been prepared by Technical Committee CEN/TC248 “Textiles and textile products”, the
16、secretariat of which is held by BSI, in collaboration with Technical Committee ISO/TC38 “Textiles”. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February2000, and conflicting national standards
17、 shall be withdrawn at the latest by February2000. EN ISO13938 is in two parts as follows: EN ISO13938-1, Textiles Bursting properties of fabrics Part1: Hydraulic method for determination of bursting strength and bursting distension (ISO13938-1:1998). EN ISO13938-2, Textiles Bursting properties of f
18、abrics Part2: Pneumatic method for determination of bursting strength and bursting distension (ISO13938-2:1998). NOTENormative references to International Standards are listed in Annex ZA (normative). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the foll
19、owing countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and theUnitedKingdom. Contents Page Foreword 2 1 Scope 3 2 Normati
20、ve references 3 3 Definitions 3 4 Principle 3 5 Sampling 3 6 Apparatus 4 7 Atmospheres for conditioning and testing 4 8 Procedure 4 9 Calculation and expression of results 5 10 Test report 5 Annex A (informative) Selection of testing areas 6 Annex ZA (normative) Normative references to International
21、 publications with their relevant European publications 7 Figure A.1 Recommended position of testing areas or test specimens 6ENISO13938-2:1999 BSI 04-2000 3 1 Scope This standard describes a pneumatic pressure method for the determination of bursting strength and bursting distension of textile fabr
22、ics. NOTEEN ISO13938-1 describes a method using hydraulic pressure. The method is applicable to knitted, woven, nonwoven and laminated 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 availa
23、ble data there appears to be no significant difference in the bursting strength results achieved using hydraulic or pneumatic burst testers, for pressures up to800kPa. This pressure range covers the majority of performance levels expected of general apparel. For speciality textiles requiring high bu
24、rsting pressures, the hydraulic apparatus is more suitable. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of this International Standard dated references, subsequent amendments to, or revisions of
25、, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative doc
26、ument referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO139:1973, Textiles Standard atmospheres for conditioning and testing. EN ISO3696, Water for analytical laboratory use Specification and test methods (ISO3696:1987). EN30012-1:1993, Qua
27、lity assurance requirements for measuring equipment Part1: Metrological confirmation system for measuring equipment (ISO10012-1:1992). 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 burs
28、ting pressure (pressure at burst) maximum pressure applied to a test specimen clamped over an underlying diaphragm until 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
29、 pressure applied to the diaphragm, with no test specimen present, to distend it to the mean bursting distension of the test specimen 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 be
30、tween the upper surface of the test specimen before distension and the top of the 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. Increasin
31、g compressed air pressure is applied to the underside of the diaphragm, causing 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
32、with the procedure laid down in the material specification for the fabric, or 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
33、 not representative of the fabric. The system of clamping used generally permits tests to be applied without cutting out test specimens.ENISO13938-2:1999 4 BSI 04-2000 6 Apparatus 6.1 Bursting tester Metrological confirmation of the bursting tester shall be carried out in accordance with EN30012-1:1
34、993. The bursting tester shall comply with the following requirements: 6.1.1 The apparatus shall be capable of producing an increase in air pressure to achieve a testing time to burst of(20 5)s. To achieve responsive adjustment of the air velocity, an indicating control valve is needed in addition t
35、o the main air valve of the apparatus. 6.1.2 Bursting pressure shall be indicated with an accuracy of 2% of full scale range above the first20% of range. 6.1.3 Height at burst up to70mm shall be indicated with an accuracy of 1mm. Zero position of the measuring gauge shall be adjustable to accommodat
36、e the thickness of the test specimen. 6.1.4 A test area of50cm 2 (79,8mm diameter) shall be used. Other test areas of100cm 2 (112,8mm diameter) or10cm 2 (35,7mm diameter) or7,3cm 2 (30.5mm diameter) may be used, if the preferred test area is not applicable in the existing testing equipment or due to
37、 high or low expansion of the fabric or other fabric 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 highl
38、y expansive fabrics (e.g.fabric test specimens whose height at burst is greater than half of the test specimen diameter). All test specimen clamping ring inner diameters shall be accurate to 0,2mm. To avoid test specimen damage a small curvature at the inner edge of the clamping ring facing the test
39、 specimen is recommended. 6.1.6 A safety cover shall 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: thi
40、ckness up to2mm; 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. 7 Atmospheres for conditioning and testing The atmospheres for preconditioning, conditioning and testing shall be as specified in ISO139:
41、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 accordance with clause7. During testing maintain the test specimens in the atmosphere for conditioning and testing in accordance with clause7
42、. 8.2 Set a test area of50cm 2(see6.1.4). NOTE 1For most fabrics, particularly knitted fabrics, the test area of50cm 2is applicable. For fabrics with low extensibility (known from previous experience or preliminary testing), e.g.forfabrics for technical application, a test area of100cm 2is recommend
43、ed. In cases where these conditions cannot be met or are not appropriate, alternative test areas in accordance with6.1.4 may be used if mutually agreed. NOTE 2Comparison of results requires the test to be performed with the same test areas. 8.3 Adjust the control valve of the bursting tester so that
44、 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 specimen over the diap
45、hragm 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 position. Faste
46、n 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 device, record t
47、his fact. Reject jaw breaks occurring within2mm 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 the control val
48、ve 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”.ENISO13938-2:1999 BSI 04-2000 5 8.6 Wet test Fo
49、r tests in the wet condition, immerse the test specimen for a period of1h in grade3 water in accordance with EN ISO3696 at a temperature of(20 2) C. For tropical regions temperature according ISO139:1973 may be used. An aqueous solution containing not more than1g/l of a nonionic wetting agent 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 the test according to8.2 to8.5. 9 Calculation and expression of resu
