1、BRITISH STANDARD BS 5131-3.7: 1991 Methods of test for Footwear and footwear materials Part 3: Uppers, textiles and threads Section 3.7 Breaking strength of shoe laces NOTEIt is recommended that this Section should be read in conjunction with BS5131-0, published separately.BS5131-3.7:1991 This Briti
2、sh Standard, having been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was published under the authority of the Board ofBSI and comes into effect on 31January 1991 BSI 10-1999 First published January 1979 Second edition January 1991 The following BSI references
3、 relate to the work on this standard: Committee reference TCM/39 Draft for comment 89/36224 DC ISBN 0 580 18821 3 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 Commi
4、ttee TCM/39, upon which 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 Footw
5、ear Distributors Federation 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
6、 SATRA Footwear Technology 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
7、 Technology Ltd. Amendments issued since publication Amd. No. Date CommentsBS5131-3.7:1991 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 Calculation and expres
8、sion of results 1 8 Test report 1BS5131-3.7:1991 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 It supersedes BS5131-3.7:1979, which is withdrawn. A British Standard does not purport to include all the nec
9、essary 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, pagesi andii, page1
10、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.BS5131-3.7:1991 BSI 10-1999 1 1 Scope This Section of BS5131 describes a method for the determination of the breakin
11、g strength of shoe laces both in equilibrium with a reference atmosphere and also in the wet state. 2 Principle Test specimens, cut from the shoe laces, are tested in a tensile testing machine. The force required to break the test specimen is determined. 3 Apparatus 1) 3.1 Conditioning cabinet or ro
12、om, maintaining an atmosphere of20 2 C and652%r.h. 3.2 A tensile testing machine, having a rate of traverse of100 20mm/min. A force range of0N to1000N (0kgf to100kgf) is suitable for most shoe laces though some of the strongest may give breaking strengths up to about1500N (150kgf). The machine provi
13、des means for gripping the shoe laces securely without inducing jaw breaks. Suitable gripping devices are bollards or serrated or rubber covered jaws. 4 Conditioning Where the shoe laces are to be tested by the dry test method (6.2), place them in the conditioning cabinet or room (3.1). After48h, cu
14、t the test specimens (seeclause5). Carry out the test in this atmosphere. Where the shoe laces are to be tested by the wet test method (6.3), do not condition them. 5 Preparation of test specimens Cut three lengths of shoe lace which are sufficiently long to allow for a test length of200mm between t
15、he grips on the tensile testing machine (3.2). If the test material is supplied as made-up shoe laces, cut each test specimen from a different shoe lace. 6 Procedure 6.1 General Select the appropriate bollards or jaws and fit them to the tensile testing machine (3.2). NOTEA preliminary test to deter
16、mine the most suitable type of clamp is recommended. 6.2 Dry test method Clamp the test specimen in the bollards or jaws so that there is a distance of200mm between the edges of the clamps in the bollards or between the edges of the jaws. Run the machine at a rate of traverse of100mm/min and note th
17、e force required to break the test specimen. Test the other two test specimens in the same way. If any of the test specimens breaks at the jaws, reject these results and carry out further tests on new test specimens until three results are obtained for test specimens which do not break at the jaws.
18、6.3 Wet test method Soak the test specimens in distilled or de-ionized water at20 C for1h. Where complete wetting of test specimens that are normally resistant to wetting is essential, use an aqueous solution containing not more than1g/L of a non-ionic wetting agent instead of water. While the test
19、specimens are still wet, determine the force required to break them using the method described in6.2. 7 Calculation and expression of results Calculate the arithmetic mean of the three results obtained using the methods described in clause6. Use this to express the mean breaking strength of the test
20、 material. 8 Test report The test report shall include the following items: a) results expressed in accordance with clause7, including an indication as to whether the tests were carried out with the shoe laces in the wet or dry state; b) nature and full identification of the sample(s); c) reference
21、to this method of test, i.e. BS5131-3.7; d) date of testing. 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 items concern
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