1、BRITISH STANDARD BS 5131-4.2: 1990 Methods of test for Footwear and footwear materials Part 4: Other components Section 4.2 Flexing index of fibreboard NOTEIt is recommended that this Section should be read in conjunction with BS5131-0, published separately.BS5131-4.2:1990 This British Standard, hav
2、ing been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was published underthe authority of the BoardofBSI and comes into effect on 31 December 1991 BSI 10-1999 First published 1975 Second edition December 1990 The following BSI references relate to the work on
3、this standard: Committee reference TCM/39 Draft for comment 89/36225 DC ISBN 0 580 18756 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Textiles and Clothing Standards Policy Committee (TCM/-) to Technical Committee TCM/39, upon which
4、 the following bodies were represented: British Footwear Manufacturers Federation British Leather Confederation British Rubber Manufacturers Association British Steel plc Consumer Standards Advisory Committee of BSI Cork Industry Federation Footwear Components Federation Footwear Distributors Federa
5、tion Institute of Trading Standards Administration Iron and Steel Trades Confederation Lancashire Footwear Manufacturers Association Mail Order Traders Association of Great Britain Ministry of Defence National Union of Footwear, Leather and Allied Trades Office of Fair Trading SATRA Footwear Technol
6、ogy Centre The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Adhesives and Sealants Association British Paper and Board Industry Federation British Plastics Federation Multiple Shoe Retailers Association RAPRA Technology Ltd. Amendm
7、ents issued since publication Amd. No. Date CommentsBS5131-4.2:1990 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Apparatus 1 4 Conditioning 1 5 Preparation of test specimens 1 6 Procedure 1 7 Expression of results 3 8 Test report 3 Figur
8、e 1 Jaw system with test specimen and weighted clamp 2BS5131-4.2:1990 ii BSI 10-1999 Foreword This Section of BS5131 has been prepared under the direction of the Textiles and Clothing Standards Policy Committee. It supersedes BS5131-4.2:1975, which is withdrawn. A British Standard does not purport t
9、o include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover,
10、 pages i and ii, pages1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5131-4.2:1990 BSI 10-1999 1 1 Scope This Section of BS5131 describes a method for ass
11、essing the flexing endurance of fibreboards. Results of the method provide a good guide to the general quality of the fibreboards used in footwear. The method is applicable to all fibreboards other than those used for insole seats and heel lifts. 2 Principle Fibreboard is flexed mechanically and rep
12、eatedly until failure occurs. From the number of flex cycles to failure, a flexing index is calculated. 3 Apparatus 1) 3.1 Conditioning cabinet or room, maintaining an atmosphere of20 2 C and652% r.h. 3.2 Flexing apparatus, with accommodation for the simultaneous testing of three test specimens, eac
13、h test station having the following essential features. a) Jaw system, in which the upper end of a vertical test specimen can be clamped, and which can be mechanically rocked about an axis immediately below the jaws in a plane perpendicular to the plane of the vertical test specimen, and to90 1 each
14、 side of the vertical, at a rate of60 10 cycles per minute. The tips of the jaws are wedge shaped with a wedge angle of38 and with the wedge line rounded to a radius of0.8 0.1mm. The axis about which the jaw system rocks is at the line where the extension of the sloping external faces of the jaws wo
15、uld intersect, as shown inFigure 1. b) Weighted clamp, with a mass of2.00 0.01kg, which can be suspended from the lower end of the test specimen. The clamp and mass are constrained to move vertically up and down below the jaws, i.e.prevented from swinging, when the test specimen is flexed. c) Counte
16、r, which indicates the total number of completed flex cycles during a test and which stops automatically on failure of the test specimen. 3.3 Double rotating blade strip cutter comprising two rotating circular sharp blades of maximum width not greater than1.06mm and equipped with spacers between the
17、 blades to provide a distance between the cutting edges of10 0.1mm. 4 Conditioning Place the sample of fibreboard in the conditioning cabinet or room (3.1). After48h, cut the test specimens (see clause5). Carry out the test in this atmosphere. 5 Preparation of test specimens From the conditioned fib
18、reboard cut one set of three rectangles using the rotating blade cutter (3.3) so as to produce test specimens of nominal width10mm and length approximately80mm, with the80mm sides parallel to the machine direction of the fibreboard, and a second set of three similar rectangles with the80mm sides par
19、allel to the cross direction of the fibreboard. 6 Procedure 6.1 Test the three test specimens from one of the two principal directions of the fibreboard simultaneously by the following procedure. 6.2 Align the test specimen in the jaws of the flexing apparatus (3.2) so that the80mm sides are perpend
20、icular to the horizontal edges of the jaws and approximately15mm of the length of the specimen is clamped by the jaws. Insert small strips of fibreboard between the jaws above the test specimen, if necessary, to ensure that the two clamping faces of the jaws stay parallel. Clamp the test specimens t
21、ightly in position, and attach the weighted clamps to the free ends. Run the flexing apparatus until all three test specimens have broken and record, using the counter, the number of flex cycles to breakage for each test specimen (X). 6.3 Repeat the procedure using the second set of test specimens w
22、hich were cut in the other principal direction of the fibreboard. 1) For information on the availability of suitable apparatus to perform this test, apply to Enquiry Section, BSI, Linford Wood, Milton Keynes, MK146LE. quoting the number of this standard and the clause number referring to the item(s)
23、 concerned. Enclose a stamped addressed envelope for reply.BS5131-4.2:1990 2 BSI 10-1999 NOTEAll dimensions are in millimetres. Figure 1 Jaw system with test specimen and weighted clampBS5131-4.2:1990 BSI 10-1999 3 7 Expression of results 7.1 Calculate the flexing index for each of the two principal
24、 directions of the fibreboard as follows: Flexing index = 1 / 3 (log 10X 1+ log 10X 2+ log 10X 3 ) where X 1 , X 2 , X 3are the respective numbers of cycles to cause failure of the three test specimens. 7.2 State the results corrected to one decimal place. 8 Test report The test report shall include
25、 the following items: a) results, expressed in accordance with clause7; b) nature and full identification of the sample; c) reference to this method of test, i.e.BS5131-4.2; d) date of testing.BS 5131-4.2: 1990 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the indepe
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