1、English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 59.140.30!%X9x“2532285www.din.deDIN EN ISO 172
2、36Leather Physical and mechanical tests Determination of extension set (ISO 17236:2016);English version EN ISO 17236:2016,English translation of DIN EN ISO 17236:2016-07Leder Physikalische und mechanische Prfungen Bestimmung der bleibenden Dehnung (ISO 17236:2016);Englische Fassung EN ISO 17236:2016
3、,Englische bersetzung von DIN EN ISO 17236:2016-07Cuir Essais physiques et mcaniques Dtermination de la dformabilit (ISO 17236:2016);Version anglaise EN ISO 17236:2016,Traduction anglaise de DIN EN ISO 17236:2016-07SupersedesDIN EN ISO 17236:2003-10www.beuth.deDocument comprises 9 pagesDTranslation
4、by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.July 201607.16DIN EN ISO 17236:2016-07 2 A comma is used as the decimal marker. National foreword This document (EN ISO 17236:2016) has been prepared by Technical Committee IULTCS “International Un
5、ion of Leather Technologists and Chemists Societies” in collaboration with Technical Committee CEN/TC 289 “Leather” (Secretariat: UNI, Italy). The responsible German body involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee
6、 NA 062-05-51 AA Anforderungen und physikalische Prfverfahren fr Leder und seine Ausgangsprodukte. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 2418 DIN EN ISO 2418 ISO 2419 DIN EN ISO 2419 ISO 2589 DIN EN ISO 2589 ISO 7500-1 DIN EN
7、ISO 7500-1 Amendments This standard differs from DIN EN ISO 17236:2003-10 as follows: a) in Clause 8 “Test report”, item d) has been aligned with ISO 2419; b) the standard has been editorially revised. Previous editions DIN EN ISO 17236:2003-10 National Annex NA (informative) Bibliography DIN EN ISO
8、 2418, Leather Chemical, physical and mechanical and fastness tests Sampling location DIN EN ISO 2419, Leather Physical and mechanical tests Sample preparation and conditioning DIN EN ISO 2589, Leather Physical and mechanical tests Determination of thickness DIN EN ISO 7500-1, Metallic materials Ver
9、ification of static uniaxial testing machines Part 1: Tension/compression testing machines Calibration and verification of the force-measuring system EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 17236 March 2016 ICS 59.140.30 Supersedes EN ISO 17236:2002 English Version Leather Physical
10、and mechanical tests Determination of extension set (ISO 17236:2016) Cuir Essais physiques et mcaniques Dtermination de la dformabilit (ISO 17236:2016) Leder Physikalische und mechanische Prfungen Bestimmung der bleibenden Dehnung (ISO 17236:2016) This European Standard was approved by CEN on 23 Jan
11、uary 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions 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 ob
12、tained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three 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
13、CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Irela
14、nd, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Cent
15、re: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 17236:2016 E EN ISO 17236:2016 (E) Contents Page European foreword . 3 Foreword 4 1 Scope 5 2 Normative references 5 3 Principle . 5 4 A
16、pparatus . 5 5 Sampling and sample preparation 6 6 Procedure. 6 7 Expression of results 7 8 Test report . 7 2DIN EN ISO 17236:2016-07 EN ISO 17236:2016 (E) European foreword This document (EN ISO 17236:2016) has been prepared by Technical Committee IULTCS “International Union of Leather Technologist
17、s and Chemists Societies” in collaboration with Technical Committee CEN/TC 289 “Leather” the secretariat of which is held by UNI. 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 September 2016, an
18、d conflicting national standards shall be withdrawn at the latest by September 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. T
19、his document supersedes EN ISO 17236:2002. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former
20、Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 17236:201
21、6 has been approved by CEN as EN ISO 17236:2016 without any modification. 3DIN EN ISO 17236:2016-07 ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally c
22、arried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the wor
23、k. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the diffe
24、rent approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may
25、 be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patent
26、s).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles
27、 in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationISO 17236 was prepared by the Physical Test Commission of the International Union of Leather Technologists and Chemists Societies (IUP Commission, IULTCS) in collaboration with the European Committee
28、 for Standardization (CEN) Technical Committee CEN/TC 289, Leather, the secretariat of which is held by UNI, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). It is based on IUP 43 which was published in J. Soc. Leather Tech. Chem. 84, p. 399, (2000) a
29、nd confirmed as an official method of the IULTCS in March 2001.IULTCS, originally formed in 1897, is a world-wide organization of professional leather societies to further the advancement of leather science and technology. IULTCS has three Commissions, which are responsible for establishing internat
30、ional methods for the sampling and testing of leather. ISO recognizes IULTCS as an international standardizing body for the preparation of test methods for leather.This second edition cancels and replaces the first edition (ISO 17236:2002), of which it constitutes a minor revision to align item d) o
31、f Clause 8 with ISO 2419:2012.EN ISO 17236:2016 (E) 4DIN EN ISO 17236:2016-07 1 ScopeThis International Standard specifies a method for determining the extension set of leather. It is intended for use on upholstery leather but is applicable to all flexible leathers.2 Normative referencesThe followin
32、g documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 2418, Leather Ch
33、emical, physical and mechanical and fastness tests Sampling locationISO 2419, Leather Physical and mechanical tests Sample preparation and conditioningISO 2589, Leather Physical and mechanical tests Determination of thicknessISO 7500-1, Metallic materials Verification of static uniaxial testing mach
34、ines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system3 PrincipleA test piece is repeatedly extended at a specified rate until the forces reach a predetermined level and the permanent extension is calculated as a percentage of the original length
35、.4 Apparatus4.1 Tensile testing machine, having a force range appropriate to the specimen under test and consisting of a means of recording the force (4.1.1) and jaws that operate at a uniform speed of separation of 50 mm 5 mm/min.4.1.1 Means of recording the force, to an accuracy as specified by Cl
36、ass 2 of ISO 7500-1.4.1.2 Jaws, minimum length 30 mm in the direction of the applied load, designed to apply constant clamping by mechanical or pneumatic means. The texture and design of the inside faces of the jaws shall be such that at the maximum load attained in the test, the test piece does not
37、 slip at either jaw.4.2 Thickness gauge, as specified in ISO 2589.4.3 Press knife, the inner wall of which is a rectangle 250 mm 5 mm 10,0 mm 0,5 mm, conforming to the requirements of ISO 2419.4.4 Ruler, reading to 0,5 mm.4.5 Stopwatch, reading to 1 s.EN ISO 17236:2016 (E) 5DIN EN ISO 17236:2016-07
38、5 Sampling and sample preparation5.1 Sample in accordance with ISO 2418.5.2 Cut six test pieces by applying the press knife (4.3) to the grain surface. Cut three test pieces with the longer edge parallel to the backbone and three with the longer edge perpendicular to the backbone.NOTE In the case of
39、 small skins, the number of test pieces is to be reduced because of the size of the test piece.If there is a requirement for more than two hides or skins to be tested in one batch, then only one test piece in each direction need be taken from each hide or skin, provided that the overall total is not
40、 less than three test pieces in each direction.5.3 Condition the test pieces in accordance with ISO 2419.5.4 Measure the thickness in accordance with ISO 2589.6 Procedure6.1 Mark a line 35 mm 5 mm from each short edge of the test piece with the line parallel to the short edges.6.2 Using the ruler me
41、asure the distance, L0, between the two lines to the nearest 1 mm.6.3 Set the jaws of the tensile testing machine (4.1) 200 mm apart. Clamp the test piece in the jaws such that the short edges of the test piece are parallel to the edges of the jaws, and about 25 mm of the test piece is clamped in ea
42、ch jaw. When the test piece is clamped its grain surface shall lie in one plane.6.4 Run the tensile test machine until a load of 20,0 N 0,5 N is reached. Immediately this load is reached stop the crosshead and keep the crosshead stopped in that position for 10 s 1 s.NOTE Stopping the crosshead keeps
43、 the sample under load although relaxation of the test piece means that the load will fall slightly.6.5 Return the crosshead to its start position as rapidly as possible.6.6 Repeat 6.4 to 6.5 so that the test piece is subjected to a total of 5 extension cycles.NOTE The cycling of the tensile test ma
44、chine is carried out manually using the stopwatch for timing or programming the load and timing into the tensile test machine.6.7 Remove the test piece from the tensile test machine immediately after the final load cycle (6.4). Start the stopwatch and lay the test piece on a flat surface with the li
45、nes applied as described in 6.1 uppermost. 60 s 5 s after removing the test piece from the tensile tester, measure the distance, L1, between the lines to the nearest 1 mm.6.8 Repeat 6.1 to 6.7 for other test pieces.6.9 If there is slippage of the test piece at either jaw, reject the result and repea
46、t the determination with a new test piece.EN ISO 17236:2016 (E) 6DIN EN ISO 17236:2016-07 7 Expression of resultsThe percentage extension set, Es, shall be calculated using Formula (1):ELLLS=()100100(1)whereL1is the final distance between the marks, in millimetres measured as described in 6.7;L0s th
47、e initial distance between the marks, in millimetres measured as described in 6.2.8 Test reportThe test report shall include the following:a) a reference to this International Standard, i.e. ISO 17236;b) the mean percentage extension set, Es, in each direction;c) the mean thickness of the test piece
48、 in each direction;d) the standard atmosphere used for conditioning and testing as given in ISO 2419;e) any deviations from the method specified in this International Standard;f) full details for identification of the sample and any deviation from ISO 2418 with respect to sampling.EN ISO 17236:2016 (E) 7DIN EN ISO 17236:2016-07
