1、May 2017 English price group 8No 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!%eBn“2663175www.din.deDIN E
2、N ISO 23910Leather Physical and mechanical tests Measurement of stitch tear resistance (ISO 23910:2017);English version EN ISO 23910:2017,English translation of DIN EN ISO 23910:2017-05Leder Physikalische und mechanische Prfungen Messung der Stichausreikraft (ISO 23910:2017);Englische Fassung EN ISO
3、 23910:2017,Englische bersetzung von DIN EN ISO 23910:2017-05Cuir Essais physiques et mcaniques Mesurage de la rsistance larrachement au point de couture (ISO 23910:2017);Version anglaise EN ISO 23910:2017,Traduction anglaise de DIN EN ISO 23910:2017-05SupersedesDIN EN ISO 23910:200801www.beuth.deDo
4、cument comprises 12 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.06.17 DIN EN ISO 23910:2017-05 2 A comma is used as the decimal marker. National foreword This document (EN ISO 23910:2017) has been prepared by Technical Comm
5、ittee IULTCS “International Union of Leather Technologists and Chemists Societies” in collaboration with Technical Committee CEN/TC 289 “Leather” (Secretariat: UNI, Italy). This standard is based on the IUP 44 method originally published in J. Soc. Leather Trades Chemists 84, p. 409, (2000) and decl
6、ared an official method of the IULTCS in 2001. The responsible German body involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee NA 062-05-51 AA “Requirements and physical test methods of leather and its starting products”.
7、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 7500-1:2015 DIN EN ISO 7500-1:2016-05 Amendments This standard differs from DIN EN ISO 23910:2008-01 as follows:
8、a) technical corrections have been made in the apparatus and in the sample preparation; b) figures have been updated; c) the test report has been extended. Previous editions DIN 53329: 1944-02 DIN 53331: 1980-05 DIN EN ISO 23910: 2008-01 DIN EN ISO 23910:2017-05 3 National Annex NA (informative) Bib
9、liography DIN EN ISO 2418, Leather Chemical, physical and mechanical and fastness test 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 7500-1:2016
10、-05, Metallic materials Calibration and verification of static uniaxial testing machines Part 1: Tension/compression testing machines Calibration and verification of the force-measuring system (ISO 7500-1:2015) DIN EN ISO 23910:2017-05 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROP
11、ENNE EUROPISCHE NORM EN ISO 23910 February 2017 ICS 59.140.30 Supersedes EN ISO 23910:2007English Version Leather - Physical and mechanical tests - Measurement of stitch tear resistance (ISO 23910:2017) Cuir - Essais physiques et mcaniques - Mesurage de la rsistance larrachement au point de couture(
12、ISO 23910:2017) Leder - Physikalische und mechanische Prfungen - Messung der Stichausreikraft (ISO 23910:2017) This European Standard was approved by CEN on 21 December 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Euro
13、pean 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official version
14、s (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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Be
15、lgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Swed
16、en, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CE
17、N national Members. Ref. No. EN ISO 23910:2017 EEuropean foreword .31 Scope . 52 Normative references 53 Terms and definitions . 54 Principle 55 Apparatus . 56 Sampling and sample preparation 77 Procedure. 78 Test report . 8Contents Page2DIN EN ISO 23910:2017-05 EN ISO 23910:2017 (E) Foreword .4Euro
18、pean foreword This document (EN ISO 23910:2017) has been prepared by Technical Committee IULTCS “International Union of Leather Technologists and Chemists Societies“ in collaboration with Technical Committee CEN/TC 289 “Leather” the secretariat of which is held by UNI. This European Standard shall b
19、e given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2017 and conflicting national standards shall be withdrawn at the latest by August 2017. Attention is drawn to the possibility that some of the elements of this document m
20、ay be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 23910:2007. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound
21、 to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
22、 Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 23910:2017 has been approved by CEN as EN ISO 23910:2017 without any modification. 3DIN EN ISO 23910:2017-05 EN ISO 23910:2017 (E) ForewordISO (the International Organi
23、zation for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been establishe
24、d has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.T
25、he 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 different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the
26、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 be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any pate
27、nt 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/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.Fo
28、r an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.ISO
29、23910 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 for Standardization (CEN) Technical Committee CEN/TC 289, Leather, the secretariat of which is held by
30、UNI, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).It is based on IUP 44 originally published in J. Soc. Leather Trades Chemists, 84, p. 409, (2000) and declared an official method of the IULTCS in 2001.IULTCS, originally formed in 1897, is a world-
31、wide organization of professional leather societies to further the advancement of leather science and technology. IULTCS has three Commissions, which are responsible for establishing international methods for the sampling and testing of leather. ISO recognizes IULTCS as an international standardizin
32、g body for the preparation of test methods for leather.This second edition cancels and replaces the first edition (ISO 23910:2007), which has been technically revised with the following changes: Figure 1 to Figure 3 have been modified.DIN EN ISO 23910:2017-05 EN ISO 23910:2017 (E) 4 1 ScopeThis docu
33、ment specifies a method for determining the stitch tear resistance of leather. It can be used on all leathers but is particularly suitable for leathers over 1,2 mm in thickness.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content c
34、onstitutes requirements of this document. 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 Chemical, physical and mechanical and fastness tests Sampling locationISO 2419, L
35、eather Physical and mechanical tests Sample preparation and conditioningISO 2589, Leather Physical and mechanical tests Determination of thicknessISO 7500-1:2015, Metallic materials Calibration and verification of static uniaxial testing machines Part 1: Tension/compression testing machines Calibrat
36、ion and verification of the force-measuring systemEN 15987, Leather Terminology Key definitions for the leather trade3 Terms and definitionsFor the purposes of this document, the terms and definitions given in EN 15987 apply.ISO and IEC maintain terminological databases for use in standardization at
37、 the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp4 PrincipleA leather test piece is pulled against a mandrel of specified shape and dimensions inserted through a slit in the leather and
38、 the force required to tear the leather is recorded.5 Apparatus5.1 Tensile testing machine, with: a force range appropriate to the specimen under test; a means of recording the force as specified by ISO 7500-1:2015, Class 2; a uniform speed of separation of the jaws of (100 20) mm/min; jaws, minimum
39、 length 25 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 specimen does not slip at either jaw.DIN EN ISO 23910:2017
40、-05 EN ISO 23910:2017 (E) 5 5.1.1 Metal test piece holder, of the shape shown in Figure 1.NOTE Figure 1 shows the test piece holder with the mandrel (5.1.2) in place.5.1.2 Metal mandrel, of the shape and dimensions shown in Figure 2.5.2 Thickness gauge, as specified in ISO 2589.5.3 Press knife, conf
41、orming to the requirements of ISO 2419, the inner wall of which is a rectangle (20 1) mm (50 1) mm and incorporates a further cutting edge, the inner wall of which will cut a slit in the test piece as shown in Figure 3 in one operation. All parts of the press knife shall lie in the same plane.Key1 m
42、andreld separation of arms of test piece holder, approximately 5 mm to 7 mmFigure 1 Metal test piece holder shown with mandrel in placeDimensions in millimetresFigure 2 Metal mandrelDIN EN ISO 23910:2017-05 EN ISO 23910:2017 (E) 6 Dimensions in millimetresKey1 thickness measurement positionNOTE The
43、dimensions associated with the slit are those of the press knife (5.3).Figure 3 Test piece6 Sampling and sample preparation6.1 After conditioning in accordance with ISO 2419, sample in accordance with ISO 2418. Cut six test pieces by applying the press knife (5.3) to the grain surface. Cut three tes
44、t pieces with the longer edge parallel to the backbone and three with the longer edge perpendicular to the backbone. The slit shall be cut with the press knife. A subsequent cut with a knife or a similar tool is not permitted.If there is a requirement for more than two hides or skins to be tested in
45、 one batch, then only one sample in each direction needs to be taken from each hide or skin, provided that the overall total is not less than three test pieces in each direction.6.2 Condition the test pieces in accordance with ISO 2419.7 Procedure7.1 Measure the thickness of the test piece in accord
46、ance with ISO 2589 at a single point on each of the test pieces. This measurement should be taken at a point approximately 10 mm from the cut end of the slit (see Figure 3).7.2 Grip the upper end of the metal test piece holder (5.1.1) in the upper jaw of the tensile testing machine.7DIN EN ISO 23910
47、:2017-05 EN ISO 23910:2017 (E) 7.3 Place the perforated end of the test piece between the arms of the test piece holder and pass the mandrel (5.1.2) through both the holes in the test piece holder and the slit in the test piece.7.4 Clamp the free end of the test piece in the lower jaw of the tensile
48、 testing machine.7.5 Run the tensile test machine until the test piece is torn apart and record the maximum force, in newtons, recorded during the tearing.7.6 Repeat 7.1 to 7.5 for other test pieces.8 Test reportThe test report shall include the following:a) a reference to this document, i.e. ISO 23910:2017;b) the thickness of the leather, in millimetres;c) the mean tear load in newtons (N) to the nearest 0,1 N for test pieces with the longer edge cut parallel to the backbon
