1、December 2015 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!%Jn“2399675www.din.deD
2、IN EN ISO 3379Leather Determination of distension and strength of surface (Ball burst method) (ISO 3379:2015);English version EN ISO 3379:2015,English translation of DIN EN ISO 3379:2015-12Leder Bestimmung der Narbendehnfhigkeit und -bruchkraft (Lastometer-Methode) (ISO 3379:2015);Englische Fassung
3、EN ISO 3379:2015,Englische bersetzung von DIN EN ISO 3379:2015-12Cuir Dtermination de lextension et de la rsistance la traction de la surface (mthode de la bille) (ISO 3379:2015);Version anglaise EN ISO 3379:2015,Traduction anglaise de DIN EN ISO 3379:2015-12www.beuth.deDocument comprises 11 pagesDT
4、ranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.01.16DIN EN ISO 3379:2015-12 2 A comma is used as the decimal marker. National foreword This document (EN ISO 3379:2015) has been prepared by Technical Committee CEN/TC 289 “Leather” (Se
5、cretariat: UNI, Italy) in collaboration with the International Union of Leather Technologists and Chemists Societies (IULTCS). The responsible German body involved in its preparation was DIN-Normenausschuss Materialprfung (DIN Standards Committee Materials Testing), Working Committee NA 062-05-51 AA
6、 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 National Annex NA (informative) Bi
7、bliography DIN EN ISO 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 EUROPEAN STANDARD NO
8、RME EUROPENNE EUROPISCHE NORM EN ISO 3379 September 2015 ICS 59.140.30 English Version Leather - Determination of distension and strength of surface (Ball burst method) (ISO 3379:2015) Cuir - Dtermination de lextension et de la rsistance la traction de la surface (mthode de la bille) (ISO 3379:2015)
9、 Leder - Bestimmung der Narbendehnfhigkeit und-bruchkraft (Lastometer-Methode) (ISO 3379:2015) This European Standard was approved by CEN on 8 August 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the s
10、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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French,
11、 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, Belgium, Bulgaria, Cr
12、oatia, 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
13、United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No.
14、 EN ISO 3379:2015 EContents Page European foreword. 3 Foreword .41 Scope . 52 Normative references 53 Terms and definitions . 54 Principle 55 Apparatus and material 66 Sampling and sample preparation 77 Procedure. 78 Test report . 8Annex A (informative) Sources of apparatus 92 EN ISO 3379:2015 (E) D
15、IN EN ISO 3379:2015-12European foreword This document (EN ISO 3379:2015) has been prepared by Technical Committee CEN/TC 289 “Leather”, the secretariat of which is held by UNI, in collaboration with Technical Committee IULTCS “International Union of Leather Technologists and Chemists Societies”. Thi
16、s 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 March 2016, and conflicting national standards shall be withdrawn at the latest by March 2016. Attention is drawn to the possibility that some of the e
17、lements 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. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this
18、 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, Romania, Slovakia
19、, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 3379:2015 has been approved by CEN as EN ISO 3379:2015 without any modification. 3EN ISO 3379:2015 (E)DIN EN ISO 3379:2015-12ForewordISO (the International Organization for Standardization) is a
20、 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 established has the right to be represente
21、d 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.The procedures used to develop th
22、is 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 editorial rules of the ISO/IEC D
23、irectives, Part 2 (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 patent rights identified during the develop
24、ment 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.For an explanation on the meaning of ISO spe
25、cific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.ISO 3379 was prepared by the Physical Test Commission of the Internatio
26、nal 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 UNI, in accordance with the Agreement on technical cooperation betwee
27、n ISO and CEN (Vienna Agreement).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 international methods for the sampling
28、 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 3379:1976), which has been technically revised.4 EN ISO 3379:2015 (E) DIN EN ISO 3379:2015-121 ScopeTh
29、is International Standard specifies a test method for the determination of distension and strength of the leather grain or finished surface. This method is applicable to all flexible leathers and it is particularly suitable to determine the lastability of leathers for footwear uppers.2 Normative ref
30、erencesThe following 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.I
31、SO 2418, Leather Chemical, 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 thickness3 Terms and definitionsFor the purposes of this document
32、, the following terms and definitions apply.3.1wearing surfaceexposed or visible face of the leather when used in its intended applicationNote 1 to entry: The wearing surface is usually the grain side of leather, however, the wearing surface of some leathers may be otherwise dressed or finished, e.g
33、. patent leather.3.2reverse sideopposite side to the wearing surfaceNote 1 to entry: The reverse side is usually the flesh side of leather.3.3crackingsmall surface splits or tears less than approximately 0,5 mm3.4burstingcomplete rupture of the full thickness of the test piece4 PrincipleA circular t
34、est piece is clamped around its edge and is gradually distended by forcing a steel metal ball, attached to the end of a plunger, against the centre of the test piece on the reverse side. At certain distension, measured in terms of distance travelled by the plunger, cracks appear on the wearing surfa
35、ce of the test piece or it sustains other permanent physical damage; this distension is recorded as the cracking point or first damage. At a higher distension, the material usually bursts and this distension may also be recorded.5EN ISO 3379:2015 (E)DIN EN ISO 3379:2015-125 Apparatus and material5.1
36、 Test machine, incorporating the following (see Figure 1).5.1.1 Clamp, for holding securely the test piece around its edge, leaving a central circular aperture of diameter 25,0 mm 0,5 mm. The design of the clamping system of the machine shall ensure that the test piece does not slip during the test
37、and shall neither stretch nor compress the central area of the test piece as it is clamped.NOTE To ensure that the test piece does not slip in the clamp during the test, it might be necessary to add some interlocking profile, serrations, or other mechanical intervention to the face of the top and bo
38、ttom clamps.5.1.2 Moveable plunger, with a hemispherical end, nominal diameter 6,25 mm 0,05 mm.5.1.3 Means of moving the plunger, without rotation, against the centre of the test piece and in a direction normal to the plane occupied by the test piece when it is clamped, at a speed of 0,20 mm/s 0,05
39、mm/s.5.1.4 Means of monitoring and recording distension of the leather, or travel of the plunger from zero, in a direction normal to the plane occupied by the test piece with an accuracy of 0,05 mm.5.1.5 Means of monitoring and recording the force on the plunger with an accuracy of 10 N.Key1 top cla
40、mp2 bottom clamp3 plunger with hemispherical endA aperture diameter (25,0 mm)Figure 1 Clamp and plunger5.2 Press knife, as specified in ISO 2419, capable of cutting a circular test piece in one operation with suitable dimensions to be firmly clamped in the test machine.5.3 Thickness gauge, as specif
41、ied in ISO 2589.6 EN ISO 3379:2015 (E) DIN EN ISO 3379:2015-126 Sampling and sample preparation6.1 Condition the leather sample in accordance with ISO 2419.6.2 Sample in accordance with ISO 2418. Using the press knife (5.2), cut at least three test pieces in accordance with ISO 2419.NOTE If there is
42、 a requirement for more than two hides or skins to be tested in one batch, then only one test piece needs to be taken from each hide or skin, provided that the overall total is not less than three test pieces.6.3 Measure the thickness of the test pieces in accordance with ISO 2589.7 Procedure7.1 Ens
43、ure that the test machine is set with the central plunger retracted to zero or minimum distension. If it has a maximum force indicator, set it to zero.NOTE “Zero” distension is set by placing a circular, rigid, and flat material in the apparatus in place of the test piece.7.2 Clamp the conditioned t
44、est piece into the test machine so that the ball-ended plunger acts on the reverse side of the test piece and the test piece is flat.7.3 Increase the distension at a rate of 0,20 mm/s 0,05 mm/s and watch the grain or finished surface for the occurrence of a crack or first damage on the surface.7.4 W
45、hen a crack or first damage occurs, record the distension in millimetre to the nearest 0,1 mm and the force in newton to the nearest 10 N. If burst is required, continue the distension with the minimum of delay.Patent leather is a special case because often, the grain of the leather cracks before th
46、e patent surface film. Particular care is therefore required when observing patent leather test pieces. Two indications of the grain cracking are a small shallow depression in the surface of the film above the crack and a momentary drop in the force on the plunger. If the patent film cracks, this sh
47、all also be regarded as a “grain crack” whether or not a crack in the grain is visible.NOTE For some leathers, it is possible to determine grain or finish cracking of the wearing surface by analysing the force-displacement curve. When cracking occurs, there is a sudden decrease in the load, to be co
48、nsidered only as a confirmation of the visual assessment.7.5 If the test piece does not crack before bursting, report the values of distension and load at burst.If the test piece does not burst when the maximum force or distension is reached, record the displacement and report the result as “more th
49、an maximum distension” or “more than maximum load” (e.g. 15 mm or 800 N).NOTE If there is a pause during the distension of a test piece, relaxation of stresses in it occurs and the force reading tends to fall. Therefore, the test is ideally continuous with no delays, but, if necessary, any delay during distension between cracking and burst is less than 15 s.7.6 Retract the plunger, remove the test specimen, and inspect the marks left by the clamps on the wearing surface of the specimen. If there are signs of slippage having
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