1、STDmBSI BS EN L277L-ENGL 2000 M Lb24bb9 0835L82 5T0 BS EN 12 77 1:2000 BRITISH STANDARD Footwear - Test methods for outsoles - Tear strength The European Standard EN 12771:1999 has the status of a British Standard NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW STD-BSI BS EN L
2、277L-ENGL 2000 Lb24669 0835383 437 M , BS EN 12771:2000 direction of the Sector AmdNo. Committee for Materiais and Chemicals, was published under the authority of the standards Committee and comes into effect on 15 March 2000 0 BSI 03-2000 National foreword Date Comments This British Standard is the
3、 official English ianguage version of EN 12771:1999. The UK participation in its preparation was entrusted to Technical Committee TCI/69, Footwear and leather, which has the responsibility to: It peisede J3S 5131-2.61979 which is withdrawn. - aid enquirem to understand the text; - present to the res
4、ponsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK A list of organbtions represented on this committee can be obtained on request to its
5、secrem. Cross-references The British Standards which implement internaonal or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Internationai Standards Correspondence Index”, or by using the “Find” faciity of the BSI Standards
6、Ele - 4,O mm f 0,2 mm for semiexpanded and cellular outsoles; - for leather outsole the full thickness shall be tested. The test is being performed with at least 3 specimens. Their uniform thickness (see specification below) shall be obtained by means of an appropriate splitting machine. If feasible
7、, smooth original skin” surfaces of the sample shall remain unchanged in the specimens. This leads to three possible types of specimen: specimen with 2 original “skins” - S 2; specimen with 1 original “skin” - S 1 ; specimen with no original “skin” - S O. The final result shall be based only on spec
8、imens of the same type, which shall be stated in the report. Q BSI 03-2000 STD=BSI BS EN L277L-ENGL 2000 m 1624667 0835187 755 m Page 6 EN 12771:1999 6 Test method Measure the thickness of the test pieces, using the thickness gauge (see 4.4). Mount the test piece in the testing machine; apply a stea
9、dily increasing traction force at a rate of separation of the grips of 100 mm/min f IO mm/min until the piece breaks. Record the force throughout the tearing process. 7 Expression of results The tear strength Ts expressed in newtons per millimetre thickness, is given by the formula T, = F/d where F
10、is the median force in newton, calculated in accordance with the following procedure: From the force peak values of the trace for tear strength, the median peak force (see 3.2) of peak force values is determined by the appropriate method specified below. NOTE In applying the methods described in thi
11、s standard, it should be assumed that the trace being evaluated is a time record of the variation of force during the period of test. Method A (for traces having less than five peaks) Determine the median of the values of the force peaks in the trace. If there is only one force peak, consider its va
12、lue to be the median. Method B (for traces having five to twenty peaks) Consider only the peak values of the central 80% of the complete trace and determine the median peak force of these values. d is the median thickness, in millimetres, of the test piece. The result is expressed as the average of
13、the three determinations. 8 Test report The test report shall include the following information: a) b) c) d) e) date of testing; 9 type of specimen; g) results, expressed in accordance with clause 7; thickness of the test pieces; full description of the samples tested including commercial styles, co
14、des, colours, nature, etc.; reference of this method of test; any deviations from this test method. Q BCI 03-2000 STDmBSI BS EN 12771-ENGL 2000 m 1b24bb9 0835190 b77 W Page 7 EN 12771 : 1999 Dimensions in millimetres Figure 1 - Trouser test piece Dimensions in millimetres Figure 2 - Trouser test pie
15、ce for leather outsoles Q BSI 03-2000 STD.BS1 BS EN 12771-ENGL 2000 M 1624669 0835191 503 M Page 8 EN 12771 : 1999 Figure 3 - Positioning of trouser test piece in testing machine BSI 03-2000 STD-BSI BS EN L2773-ENGL 2000 Lb24667 0835392 44T E Page 9 EN 12771:1999 Bibliography IS0 34-1 : 1994 Rubber,
16、 vulcanized or thermoplastic - Determination of tear strength - Part 1: Trouser, angle and crescent test pieces. O BSI 03-2000 BS EN 12771:2000 STDOBSI BS EN 12771-ENGL 2000 W 1624667 0635193 386 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent nati
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