FORD FLTM BN 157-02-2010 DETERMINATION OF LEATHER STIFFNESS《皮革刚度的测定》.pdf

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1、 FORD LABORATORY TEST METHODBN 157-02Date Action Revisions 2010 01 13 Activated J. Williams, EU Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 1 of 3 DETERMINATION OF LEATHER STIFFNESS Application To assess the flexural stiffness of leather (45 Cantilever Method)

2、Scope This procedure is applicable to all types of leather. Apparatus and Materials Required Constructed from smooth planed wood, having the dimensions shown below with a graduated scale on the top surface, from 0 to 200mm (1mm graduations), with 0mm at the right angled end of the block. Steel press

3、er plate. Dimensions: Wood Block: Length (base) 285mm Height 85mm Width 34mm Presser Plate: Steel Bar Length 200mm Height 5mm Width 25mm Graduation Scale: 0 200mm with 1mm graduations Preparation Cut two pairs of test pieces, 25 mm x 200mm, parallel to and perpendicular to the backbone. Conditioning

4、 The test pieces must be flat and be conditioned for 24 hours at 23 2 C and 50 5% Relative Humidity. Procedure 1. Place the test piece on the horizontal top surface of the test block so that the narrow end of the test piece is aligned with the zero on the scale 2. Press the test piece with the press

5、er plate and slide both slowly towards the 45 slope at a speed of approximately 10mm/second. 3. When the sample first touches the 45 slope, the value is taken at A (The end of the test piece) against the corresponding graduations. FORD LABORATORY TEST METHODBN 157-02Printed copies are uncontrolled C

6、opyright 2010, Ford Global Technologies, LLC Page 2 of 3 4. Measure each test piece four times, reversing its direction and by turning it over (i.e. measure both the grain and the flesh side) e.g. Test piece parallel to backbone Measurement 1: Grain side up/Right hand side Measurement 2: Grain side

7、up/Left hand side Measurement 3: Flesh side up/Right hand side Measurement 4: Flesh side up/Left hand side Repeat for samples taken perpendicular to the backbone and for the other samples. REPORT 1. The stiffness is determined by the average values taken at A, this value is calculated for both sides of the hide as well as for the direction of the samples, i.e. parallel to and perpendicular to the backbone. Total of eight measurements for each pair of samples. FORD LABORATORY TEST METHODBN 157-02Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 3 of 3