1、EN290753 June 1992 A UDC 677,076.4 : 677.017.42 : 620.172 Descriptors: Textiles, fabrics, nonwoven fabrics, tests, tension tests, tensile strength, elongation at break English version Textiles - Test methods for nonwovens - Part 3: Detekalion of tensile strength and elongation Textile - Mhodes dessa
2、i pour nontisss Partie 3 Dlembation de la rsistance la Textilien - PrUfverfahren von Viiesstoffe - nil3 Bestlmm a ung der H.k- und der traction et de ialongement H-hW This European Standard was approved by CEN on 1992-06-26. CEN members are bound to comply with the CEN/CENELEC Jntema Regulations whi
3、ch stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Upto-date lists and bibliographical references concemg such national stanhds may be obtained on application to the Centrai Secretariat or to any CEN member. This European standard
4、exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member inta its own language and notifed to the Central Secretariat has the same status as the officiai venions. CEN members are the national standards b
5、odies of Austria, Belgium, Denmark, Finland, Rance, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Sec
6、retariat: rue de Stassart 36, B-1050 Brussels O 1992 Copynght reserved to CEN members Ref. No. EN 290733 : 1992 E Ir Page 2 I EN 290733 : 1992 CEN EN+29073-3 92 m 3404589 0034b90 03T m Foreword The European Standard has been taken over by CEN/IY: 248 Textile and textile products from the work of Iso
7、/M: 38 kxtiies of the international Organization for Stanardkhon (IS). The document was submitted to the CEN members to the Unique Acceptance Procedm and was appmved without any modication. National standards identical to this European Standard shall be published at the iatest by 19921231 and the la
8、test by 19921231. Foliowing the CEWCENELEX Common Rules the following countries are bound to implement this European standard: Austria, Belgium, Denmark, Fniand, France, Germany, Greece, Iceland, Ireland, ItAy, Luxembourg, Netherlands, Norway, Poxtugal, conflicting national standards shallbe withdmw
9、n at Spain, Sweden, Switzerland, united Kirlgdom. CEN ENx29073-3 72 D 3404587 0034b9L T76 INTERNATIONAL STANDARD IS0 9073-3 : 1989 (E) Textiles - Test methods for nonwovens - Part 3: Determination of tensile strength and elongation 1 Scope This part of IS0 9073 specifies a method for the determinati
10、on of the tensile properties of nonwovens by the cut strip method. NOTE - Anomalies can occur when testing some spun-laid and glass fibre nonwovens. This may require modification of the test procedure. 2 Normative references The following standards contain provisions which, through reference in this
11、 text, constitute provisions of this part of IS0 9073. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this patt of IS0 9073 are encouraged to investigate the possibility of applying the most recent editions of
12、the standards listed below. Members of IEC and IS0 main- tain registers of currently valid International Standards. IS0 139 : 1973, Textiles - Standard atmospheres for con- ditioning and testing. IS0 186 : 1985, Paper and board - Sampling to determine average quality. IS0 5081 : 1977, Textiles - Wov
13、en fabrics - Determination of breaking strength and elongation (Strip method). 3 Principle Application of a force longitudinally to a test piece of a specified length and width at a constant rate of extension. Determination of values for breaking strength and elongation from the recorded force-elong
14、ation curve. 4 Apparatus 4.1 Tensile testing machine, constant rate of extension type, equipped with an autographic recorder to register applied force and clamp separation. 4.2 securely across their full width without damage. Clamps, with jaws capable of holding the test pieces 5 Sampling Carry out
15、sampling in accordance with IS0 186, where possible taking test specimens of an approximate length at 1 m from the full width of the material. Ensure that the areas from which the specimens are taken have no visible flaws and are not creased. NOTE - This method of sampling recognizes and makes provi
16、sions for “anisotropy“ (differences in properties along various directions, princi- pally machine and cross directionl in the final specimens. However, these specimens are random representatives of the material and in some cases it may be desirable to investigate systematic variations of properties
17、(including anisotropy), for example across the width, or in certain positions along the length of a given reel. In all such cases, spe- cial provisions should be agreed between purchaser and vendor and recorded in the test report. A procedure for more detailed examination of variability within a giv
18、en batch of material is available in TAPPI T 11-05-74 and may be found helpful. This publicatlon may be obtained from: The Technical Association of Pulp and Paper Industries. 1 Dun- woody Park, Atlanta, Georgia 30338, USA. 6 Preparation and conditioning of test pieces 6.1 Unless otherwise specified,
19、 cut five test pieces in the machine direction and five in the cross-machine direction, ensuring that they are all taken at least 100 mm from the edge and are equally distributed across the width and length of the specimen. 6.2 Cut the test pieces 50 mm k 0.5 mm wide and of suf- ficient length to al
20、low a jaw separation of 200 mm, thus avoiding risks due to local heterogeneity of nonwovens or to undue cutting of long-fibre nonwovens. NOTE - Wider test pieces and different forms of clamping, e g C-form or piped form, may be used by agreement between the Interested parties. a note of these specia
21、l conditions should be included in the test report. 6.3 Condition the test pieces as specified in IS0 139. 6.4 If wet tensile tests are required, soak the test pieces, without conditioning, for at least 1 h in a solution containing 1 IS0 9073-3 : 1989 (E) 1 g of a non-ionic wetting agent per litre o
22、f distilled water. Remove a test piece, shake off excess water, and test im- mediately. Repeat the operation for each of the other nine test pieces. NOTE - A wetting time of less than 1 h may be used by agreement between the interested parties; if so, it should be noted in the test report. 7 Procedu
23、re 7.1 testing (see IS0 139). Carry out the testing in the standard atmosphere for 7.2 Set the jaws of the tensile testing machine Mo mm f 1 mm apart and clamp the test piece between them; straighten out the test piece until the force curve is on the zero line. NOTES 1 Pretensioning may be applied a
24、s described in IS0 5os1; if so, it should be noted in the test report. 2 Where 200 mm is not available, a shorter test piece may be tasted by agment bennieen the interested parties; if so, this should be noted in the test report. 7.3 Apply a constant rate of extension of 100 mmlmin and record the fo
25、rce-dongation curve for each test piece. NOTE - Other rates of extension may be desirable and should be agreed between the interested parties; if sa, they should be noted in the test report. 8 Expression of results 8.1 Use the force-elongation curve to determine the maxi- mum breaking strength in ne
26、wtons. If several peak values for the breaking strength occur during the test, take the highest value as the maximum breaking strength, and note this occur- rence in the test report. 8.2 Determine the elongation of the test piece at the maxi- mum breaking strength and express this as a percentage of
27、 the nominal gauge length, that is, the original jaw separation. 8.3 Discard the results from any test piece where the break occurs in the clamp or where any break reaches the jaws at a minimum of one point. 8.4 Determine the means of the results, expressing the average breaking strength, in newtons
28、, to the nearest 0.1 N, and the average percentage elongation at break to the nearest 0,5 %. Calculate the coefficients of variation of the results. NOTE - Rupture energy may also be calculated from the total area under the curve. 9 Test report The test report shall include the following information
29、 : ai a reference to this part of IS0 9073; bl all details necessary for the identification of the material; c) the results of the test in both the machine direction and cross direction (see 8.41; d) the conditioning atmosphere used; e) any unusual features noted during the testing, or devi- ations from the standard procedure.
