1、BSI Standards PublicationBS EN ISO 5402-2:2015Leather Determination offlex resistancePart 2: Vamp flex methodBS EN ISO 5402-2:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO5402-2:2015. It supersedes BS EN ISO 22288:2009 which is withdrawn.The UK partic
2、ipation in its preparation was entrusted to TechnicalCommittee TCI/69, Footwear, leather and coated fabrics.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users a
3、re responsible for its correctapplication. The British Standards Institution 2015. Published by BSI Standards Limited 2015ISBN 978 0 580 78900 7ICS 59.140.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theS
4、tandards Policy and Strategy Committee on 31 October 2015.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5402-2 October 2015 ICS 59.140.30 Supersedes EN ISO 22288:2009English Version Leather - Determination of flex resistance
5、- Part 2: Vamp flex method (ISO 5402-2:2015) Cuir - Dtermination de la rsistance la flexion - Partie 2: Mthode de flexion dempeigne (ISO 5402-2:2015) Leder - Bestimmung der Dauerbiegefestigkeit - Teil 2: Blattbiege-Verfahren (ISO 5402-2:2015) This European Standard was approved by CEN on 8 August 20
6、15. 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 obtained
7、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 CEN-CEN
8、ELEC 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, Ireland, Ita
9、ly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Aven
10、ue 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. EN ISO 5402-2:2015 EBS EN ISO 5402-2:2015EN ISO 5402-2:2015 (E) 3 European foreword This document (EN ISO 5402-2:2015) has been prepared by Technical C
11、ommittee CEN/TC 289“Leather”, the secretariat of which is held by UNI, in collaboration with IULTCS “International Union ofLeather Technologists and Chemists Societies“. This European Standard shall be given the status of a national standard, either by publication of anidentical text or by endorseme
12、nt, at the latest by April 2016, and conflicting national standards shall bewithdrawn at the latest by April 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject ofpatent rights. CEN and/or CENELEC shall not be held responsible for identifying any
13、 or all such patentrights. This document supersedes EN ISO 22288:2009. According to the CEN-CENELEC Internal Regulations, the national standards organizations of thefollowing countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,Croatia, Cyprus, Czech Republic, Denmark,
14、 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 the United Kingdom. Endorsement notice Th
15、e text of ISO 5402-2:2015 has been approved by CEN as EN ISO 5402-2:2015 without anymodification. BS EN ISO 5402-2:2015ISO 5402-2:2015(E)IULTCS/IUP 39-2:2015(E)Foreword iv1 Scope . 12 Normative references 13 Principle 14 Apparatus . 15 Sampling and sample preparation 46 Procedure. 47 Test report . 5
16、Annex A (informative) Sources of apparatus . 6 ISO 2015 All rights reserved iiiContents PageBS EN ISO 5402-2:2015ISO 5402-2:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Intern
17、ational 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 represented on that committee. International organizations, governmental and non-governmental, in liaison with
18、 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 this document and those intended for its further maintenance are described in the ISO/IEC Directives,
19、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 Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of th
20、e 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 development of the document will be in the Introduction and/or on the ISO list of patent declarations r
21、eceived (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 specific terms and expressions related to conformity assessment, as well as information about ISOs
22、 adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationISO 5402-2, formerly ISO 22288, was prepared by the Physical Test Commission of the International Union of Leather Technologists and Chemists Societies (IUP Commission
23、, 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 between ISO and CEN (Vienna Agreement). It was published as EN 13335.It is base
24、d on IUP 39 published in J. Soc. Leather Tech. Chem., 84 (7), p. 381, 2000, and declared an official method of the IULTCS in March 2001. The title was changed, Clause 4 revised in 2013, and the standard re-numbered as ISO 5402-2.IULTCS, originally formed in 1897, is a world-wide organization of prof
25、essional 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 standardizing body for the preparatio
26、n of test methods for leather.This first edition cancels and replaces ISO 22288:2006 which has been technically revised.ISO 5402 consists of the following parts, under the general title Leather Determination of flex resistance: Part 1: Flexometer method Part 2: Vamp flex methodIULTCS/IUP 39-2:2015(E
27、)iv ISO 2015 All rights reservedBS EN ISO 5402-2:2015INTERNATIONAL STANDARDISO 5402-2:2015(E)IULTCS/IUP 39-2:2015(E)Leather Determination of flex resistance Part 2: Vamp flex method1 ScopeThis part of ISO 5402 specifies a method for determining the wet or dry flex resistance of leather and finishes
28、applied to leather. It is applicable to all types of leather below 3,0 mm in thickness.2 Normative referencesThe 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
29、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, Leather Physical and mechanical tests Sample preparation and conditioningISO 3696, Water for analytic
30、al laboratory use Specification and test methods3 PrincipleA test piece is folded with the surface to be tested outwards over two inverted “V” shaped clamps. Relative movement of the clamps flexes the sample producing one downward crease surrounded by four upward creases. The test piece is examined
31、periodically for damage.4 Apparatus4.1 Test machine, incorporating the following.4.1.1 Two inverted “V” shaped clamps (Figures 1 and 2), aligned parallel to one another, centred on the same axis and with a minimum separation between the clamps of (9,5 1,0) mm.Each clamp shall have two parts.4.1.1.1
32、An outer part comprising a “V” form with an internal angle of (40 1) and a truncated tip radius of (6,4 0,5) mm.4.1.1.2 An inner part having the shape and size that shall complement the outer part.4.1.2 A means of applying a simple harmonic reciprocating motion between the two clamps, to move them a
33、part by (19,0 1,5) mm and return them to the minimum separation (4.1.1) at a rate of oscillation of (300 30) cycles/min.4.1.3 Counter, to indicate the number of complete cycles. ISO 2015 All rights reserved 1BS EN ISO 5402-2:2015ISO 5402-2:2015(E)Key1 clamp, outer part2 clamp, inner partA internal a
34、ngle, (40 1)B radius, (6,4 0,5) mmFigure 1 Inverted “V” shaped clampIULTCS/IUP 39-2:2015(E)2 ISO 2015 All rights reservedBS EN ISO 5402-2:2015ISO 5402-2:2015(E)a) Plan view Crease pattern formed by flexingb) Side view Crease pattern in example test pieceKey1 inverted “V” shaped clamps2 test piece3 f
35、olds with surface to be tested inwards4 folds with surface to be tested outwards5 oscillation (9,5 mm to 19,0 mm)Figure 2 Crease patternsIULTCS/IUP 39-2:2015(E) ISO 2015 All rights reserved 3BS EN ISO 5402-2:2015ISO 5402-2:2015(E)4.2 Press knife, conforming to the requirements of ISO 2419, the inner
36、 wall of which is a square of side 64 mm 1 mm.4.3 Magnifier, with a magnification of four to six times.4.4 Distilled or deionized water, conforming to the requirements of grade 3 of ISO 3696.5 Sampling and sample preparation5.1 Sample in accordance with ISO 2418. Cut four test pieces parallel to the
37、 backbone and four test pieces perpendicular to the backbone by applying the press knife (4.2) to the surface to be tested. Use two test pieces parallel to and two test pieces perpendicular to the backbone for dry tests and two test pieces parallel to and two test pieces perpendicular to the backbon
38、e for wet tests.If there is a requirement for more than two hides or skins to be tested in one batch, then only two samples in each direction need be taken from each hide or skin, giving one sample in each direction for both dry and wet, provided that the overall total is not less than four test pie
39、ces in each direction.5.2 For dry flex testing, condition the test pieces in accordance with ISO 2419 and perform the test in the conditioned atmosphere.5.3 For wet flex testing, the test pieces can be wetted by rubbing approximately 1 ml of distilled or deionized water into the flesh surface of the
40、 leather. The wetting should be repeated every 25,000 flexes during the test. Carry out wet flexing without delay.6 Procedure6.1 Remove the upper parts of the clamps (4.1.1) and adjust the test machine so that the clamps are at their maximum separation.6.2 Fold the test piece evenly over the “V” sha
41、ped clamps with the surface to be tested uppermost and hold in place by replacing the upper parts of the clamps, ensuring that there is no slack in the test piece. Position two test pieces so that the direction of the backbone is along the axis of movement of the clamps and two so that it is perpend
42、icular to the axis.6.3 Slowly move the clamps together and observe the test pieces to ensure that the centre of each test piece folds downwards (Figure 2). If this is not the case, apply gentle pressure to the centre of the ridge as the clamps move together to make a downward fold form.6.4 Run the m
43、achine for the required number of flex cycles selected from the following list: Dry flex: 50 000; 100 000; 250 000; 500 000; 1 000 000 cycles; Wet flex: 50 000; 100 000 cycles.In addition to the above inspection points, remove the wet test pieces from the machine every 25 000 cycles and examine them
44、 for spue before re-wetting and replacing in the test machine.NOTE Other inspection points are considered if required.6.5 Stop the test machine and remove the test piece. Examine visually in good light using the naked eye and with the magnifier (4.3). Examine the test piece with it both lying flat a
45、nd folded. Record any damage IULTCS/IUP 39-2:2015(E)4 ISO 2015 All rights reservedBS EN ISO 5402-2:2015ISO 5402-2:2015(E)in the flexed area, ignoring damage in the clamped area. Cut through the flexed area if required to assist identification of loose leather structure.Cutting through the test piece
46、 damages it too severely to allow further testing and may only be carried out after the final inspection.The damage can include the following:a) creasing in the central inward fold;b) cracking in the central inward fold;c) cracking in the outward folds;d) delamination or flaking of the surface finis
47、h;e) cracking extending to the edge of the test piece;f) onset of appearance of spue (wet flex only) when examined both wet (immediately after completion of the test) and after allowing to completely dry at standard room temperature as prescribed in ISO 2419.6.6 If required, replace the test piece i
48、n the clamps using the marks produced by the clamps as a guide to ensure that the test piece is returned to its original position in the clamps.6.7 Restart the machine and continue to the next required number of cycles. Repeat the inspection given in 6.5.6.8 Repeat 6.6 and 6.7 if required for other
49、numbers of flex cycles.6.9 After the final wet inspection, allow to completely dry at standard room temperature as prescribed in ISO 2419.NOTE The actual number of cycles chosen depends on the specification, the end use of the leather, and the expected performance.7 Test reportThe test report shall include the following:a) a reference to this part of ISO 5402, i.e. ISO 5402-2;b) full details for identification of the sample;c) whether the leather was tested wet or dry;d) the number of flex cycles and damage a
