1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 5402-1:2011Leather Determination offlex resistancePart 1: Flexometer method (ISO5402-1:2011)Copyright European Committee for Standardization Provided by IHS under licen
2、se with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 5402-1:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO5402-1:2011. It supersedes BS EN ISO 5402:2002 which is withdrawn.The UK participation in its p
3、reparation 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 are responsible f
4、or its correctapplication. The British Standards Institution 2012ISBN 978 0 580 67803 5ICS 59.140.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2012
5、.Amendments issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5402-1 December 201
6、1 ICS 59.140.30 Supersedes EN ISO 5402:2002English Version Leather - Determination of flex resistance - Part 1: Flexometer method (ISO 5402-1:2011) Cuir - Dtermination de la rsistance la flexion - Partie 1: Mthode au flexomtre (ISO 5402-1:2011) Leder - Bestimmung der Dauerbiegefestigkeit - Teil 1: F
7、lexometer-Verfahren (ISO 5402-1:2011) This European Standard was approved by CEN on 14 December 2011. 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. U
8、p-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, German). A version in any other language made by tran
9、slation 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finla
10、nd, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KO
11、MITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5402-1:2011: ECopyright European Committee for Standardization Provided by IHS under license with CENNot
12、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 5402-1:2011EN ISO 5402-1:2011 (E) 3 Foreword This document (EN ISO 5402-1:2011) has been prepared by Technical Committee CEN/TC 289 “Leather”, the secretariat of which is held by UNI, in collaboration with IULT
13、CS “International Union of Leather Technologists and Chemists Societies“. 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 June 2012, and conflicting national standards shall be withdrawn at the la
14、test by June 2012. 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. This document supersedes EN ISO 5402:2002. According to the CEN/CEN
15、ELEC 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuan
16、ia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license f
17、rom IHS-,-,-BS EN ISO 5402-1:2011ISO 5402-1:2011(E) IULTCS/IUP 20-1:2011(E) ISO 2011 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is n
18、ormally 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 ISO, also take part i
19、n the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prep
20、are International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that s
21、ome 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. ISO 5402-1 was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 289, Leather, in collaboration with the Ph
22、ysical Test Commission of the International Union of Leather Technologists and Chemists Societies (IUP Commission, IULTCS), in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement). IULTCS, originally formed in 1897, is a world-wide organization of professiona
23、l 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 preparation of te
24、st methods for leather. This first edition of ISO 5402-1 cancels and replaces ISO 5402:2002. Subclauses 4.1.1, 4.8, 4.9, 4.10, 5.1, 6.6 and 6.10 have been technically revised. ISO 5402 consists of the following part, under the general title Leather Determination of flex resistance: Part 1: Flexomete
25、r method The following part is planned: Part 2: Vamp flex method Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 5402-1:2011Copyright European Committee for Standardiza
26、tion Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 5402-1:2011INTERNATIONAL STANDARD ISO 5402-1:2011(E)IULTCS/IUP 20-1:2011(E) ISO 2011 All rights reserved 1Leather Determination of flex resistance Part 1: Flexomete
27、r method 1 Scope This part of ISO 5402 specifies a method for determining the wet or dry flex resistance of leather and finishes applied to leather. It is applicable to all types of flexible leather which are less than 3,0 mm thick. 2 Normative references The following referenced documents are indis
28、pensable for the application 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 location ISO
29、2419, Leather Physical and mechanical tests Sample preparation and conditioning ISO 3696:1987, Water for analytical laboratory use Specification and test methods 3 Principle A test piece is folded with the surface to be tested inwards and clamped in an upper moveable clamp, with the surface to be te
30、sted outwards in a lower fixed clamp. Movement of the upper clamp causes a fold in the test piece to run along it. The test piece is examined periodically for damage. 4 Apparatus and materials 4.1 Test machine, including the parts described in 4.1.1 to 4.1.3. 4.1.1 Upper clamp, consisting of a pivot
31、ing pair of flat plates of maximum 4 mm thickness as shown in Figure 1. One plate has the basic shape of a trapezium ABCFD but with a radius of 2 mm at F. It has a ledge EF 4 mm 1 mm thick to support the folded test piece. The other plate has the shape EGHCF. The clamp tightening screw draws the pla
32、tes together and also acts as a stop to prevent the test piece from being positioned closer to AB than the vertical through C. A stop near the edge AB and approximately midway between A and B ensures that the plates clamp more effectively near point F. The upper clamp can be reciprocated by a motor
33、about a horizontal axle, descending through an angle of 22 30 0 30 at a frequency of 100 cycles/min 5 cycles/min. 4.1.2 Lower clamp, fixed and lying directly beneath (planar to) the upper clamp and consisting of a pair of flat plates to hold the test piece. The position of the lower clamp is such th
34、at the distance between the ledge EF and the upper edge of the fixed lower clamp, when the ledge EF is horizontal, is 25,0 mm 1,0 mm. 4.1.3 Counter, to indicate the number of cycles. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction
35、or networking permitted without license from IHS-,-,-BS EN ISO 5402-1:2011ISO 5402-1:2011(E) IULTCS/IUP 20-1:2011(E) 2 ISO 2011 All rights reservedDimensions in millimetres Key 1 flexing angle 22 30 0 30 2 clamp tightening screw 3 2 mm radius F 4 horizontal axle Figure 1 Upper clamp 4.2 Press knife,
36、 conforming to the requirements of ISO 2419, the inner wall of which is a rectangle (70 mm 1 mm) (45 mm 1 mm). 4.3 Magnifier, with a magnification of 4 to 6 times. 4.4 Desiccator, or other vessel that can be evacuated. 4.5 Vacuum pump, capable of reducing the pressure in the desiccator to less than
37、4 kPa. 4.6 Distilled or deionized water, of grade 3 in accordance with the requirements of ISO 3696:1987. 4.7 Glass dishes, minimum diameter 100 mm and minimum depth 25 mm. 4.8 Mandrel, having a diameter of 10 mm and a minimum length of 70 mm. 4.9 Metal clip, 70 mm wide, capable of fixing a specimen
38、 around the mandrel (4.8) at a slight stretch. 4.10 Stereomicroscope, with a magnification of 25 times. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 5402-1:2011ISO 5
39、402-1:2011(E) IULTCS/IUP 20-1:2011(E) ISO 2011 All rights reserved 35 Sampling and sample preparation 5.1 Sample in accordance with ISO 2418. From the sample, cut at least four pieces for the dry test and/or four pieces for the wet test by applying the press knife (4.2) to the grain surface. Cut at
40、least two test pieces with the long edge parallel to the backbone and two with the long edge perpendicular to the backbone. 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
41、that the overall total is not less than three pieces in each direction. 5.2 For dry-flex testing, condition the test pieces in accordance with ISO 2419 and test in the conditioned atmosphere. 5.3 For wet-flex testing, place the test pieces in a glass dish (4.7), add sufficient distilled or deionized
42、 water to give a minimum depth of 10 mm, put the dish in the desiccator and reduce the pressure to below 4 kPa for 2 min. Restore to normal atmospheric pressure and repeat the pressure reduction/restoration twice. Remove the test piece and remove excess water using blotting paper. Carry out wet flex
43、ing without delay. NOTE It may not be possible to clamp thick leathers in the upper clamp. In such cases, the thickness of the test piece can be reduced for a maximum length of 15 mm from one end only and that end inserted in the upper clamp. Even so, the leather may be too stiff to be tested by thi
44、s method. 6 Procedure 6.1 Open the upper and lower clamps (4.1.1 and 4.1.2) so that the gap is at least twice the thickness of the test piece. 6.2 Turn the motor until the ledge EF on the upper clamp (4.1.1) is parallel to the upper edge of the fixed lower clamp, as shown in Figure 2 c). 6.3 Fold th
45、e test piece in two with the surface to be tested inwards so that the two longer sides are brought together. Clamp the folded test piece as shown in Figure 2 a) with the folded edge against the ledge and the end against the stop formed by the clamping screw. a) Sample in upper clamp b) Sample folded
46、 back c) Sample fully clamped Figure 2 Loading of the test piece Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN ISO 5402-1:2011ISO 5402-1:2011(E) IULTCS/IUP 20-1:2011(E) 4
47、 ISO 2011 All rights reserved6.4 Draw the free corners of the test piece outward and downward around the clamp as shown in Figure 2 b). Bring the inner surfaces together and clamp the free end in the lower clamp as shown in Figure 2 c), keeping the part of the folded test piece in the clamps vertica
48、l and using no more force than is necessary to make the leather just taut. 6.5 Run the machine for the required number of flex cycles selected from the following lists: Dry flex: 500; 1 000; 5 000; 10 000; 20 000; 25 000; 50 000; 100 000; 150 000; 200 000; 250 000 cycles; Wet flex: 500; 1 000; 2 500; 10 000; 20 000; 25 000; 50 000 cycles. In addition to the above inspection points, remove the wet test pieces from the machine every 25 000 cycles and examine them for spue before re-wetting (5.3) them and replacing them in the test machine. T
