1、BRITISH STANDARD BS5131-3.6: 1991 Methods of Test for footwear and footwear materials Part3: Uppers, textiles and threads Section3.6 Abrasion resistance of shoe laces NOTEIt is recommended that this Section should be read in conjunction with BS5131-0, publishedseparately.BS5131-3.6:1991 This British
2、 Standard, having been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was published underthe authority of the BoardofBSI and comes intoeffecton 31 January1991 BSI12-1999 First published January1979 Second edition January1991 The following BSI references relate t
3、o the work on this standard: Committee referenceTCM/39 Draft for comment89/36223DC ISBN 0 580 18820 5 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,
4、 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 Footwear Distribu
5、tors 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 SATRA Footw
6、ear 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 Technology
7、Ltd. Amendments issued since publication Amd. No. Date CommentsBS5131-3.6:1991 BSI 12-1999 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 rep
8、ort 3 Figure 1 Apparatus for abrading the shoe lace 2BS5131-3.6:1991 ii BSI 12-1999 Foreword This Section of BS5131 has been prepared under the direction of the Textiles and Clothing Standards Policy Committee. It supersedes BS5131-3.6:1979, which is withdrawn. A British Standard does not purport to
9、 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、pagesi andii, pages1 to3 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.BS5131-3.6:1991 BSI 12-1999 1 1 Scope This Section of BS5131 describes a method for determi
11、ning the abrasion resistance of shoe laces. Shoe laces are tested in the dry (conditioned) state and in the wet state in cases where poor wet abrasion resistance is suspected (mainly laces containing viscose). 2 Principle A shoe lace is abraded by rubbing it backwards and forwards through a referenc
12、e eyelet under tension. The number of cycles required to break the shoe lace is determined. Tests are carried out on both dry and wet specimens. NOTEThe wear on a shoe lace, which ultimately causes it to break, is produced mainly by rubbing against the edge of the eyelet rather than by one section o
13、f shoe lace rubbing against another section of shoe lace. 3 Apparatus 1) 3.1 Conditioning cabinet or room, maintaining an atmosphere of20 2 C and652%r.h. 3.2 Apparatus for abrading the shoe lace, the essential features of which are illustrated in Figure 1. The eyelet, clenched in a rectangle of fibr
14、eboard, is held at an angle of45 to the horizontal and the shoe lace passes through it. One end of the shoe lace is held in a clamp and is moved horizontally backwards and forwards with a stroke of76 2mm by a crank worked by a wheel rotating at a uniform speed of100 10r/min. A454 5g mass is suspende
15、d from the other end of the test specimen so that the shoe lace is held under continuous tension during the abrasion cycle. This mass is guided by suitable tubes or rods so that during the test it can move only up and down and cannot swing sideways. The machine is fitted with a counter which stops w
16、hen the test specimen breaks. A simple way of achieving this is by the shoe lace tensioning weight falling on to a counter cut-out switch. The machine is also fitted with a pre-set counter switch, so that when desired the machine can be made to stop after a pre-set number of cycles. 3.3 Reference ey
17、elets, brass, nominal4.5mm internal diameter, each being individually mounted in a piece of fibreboard to enable it to be fitted in the abrasion machine. A piece of rigid fibreboard such as pattern board25mm 38mm 3mm is suitable, with a5mm diameter hole in the centre. The eyelet is then inserted and
18、 clenched in the normal way using a machine or hand tool made for this purpose. 3.4 Reference shoe lace, used for “running-in” the reference eyelets before they are used to test any other lace. A round cotton lace, with core, which has an abrasion resistance when tested with the reference eyelet in
19、the range10000 to20000cycles is suitable. 4 Conditioning Where the shoe laces are to be tested by the dry test method(6.2), place the shoe laces in the conditioning cabinet or room(3.1). After48h, cut the test specimens (see clause5). Carry out the test in this atmosphere. Where the shoe laces are t
20、o be tested by the wet test method(6.3), do not condition the shoe laces. 5 Preparation of test specimens From the shoe laces cut six test specimens, each about180mm to200mm long. If sufficient shoe laces are available, cut each test specimen from a separate shoe lace. If necessary, shoe laces as sh
21、ort as about100mm may be tested by tying string to each end of the shoe lace provided that the shoe lace and not the string rubs against the eyelet during the rubbing stroke. Record whether the test specimens consisted of shoe lace or shoe lace and string. 6 Procedure 6.1 Pre-polishing the reference
22、 eyelet Before a new eyelet is suitable for use as a reference eyelet, pre-polish it and remove any surface irregularities that would otherwise affect the test results. In order to do this, load the apparatus(3.2) as described in6.2 using a reference shoe lace(3.4) and pre-set the machine to run for
23、10000cycles. Then take the mounted eyelet out of the machine, turn it round (top-to-bottom, not back-to-front), replace it, and polish the other side of the eyelet hole diameter for10000cycles using a new length of reference shoe lace, thereby producing a reference eyelet(3.3). NOTETests have shown
24、that for the first10000cycles approximately, the eyelet is somewhat more severe in its abrasive action. After that, the test result is not dependent on the extent to which the eyelet has been used, up to about100000cycles. Consequently, reference eyelets may be re-used provided that the side of the
25、eyelet hole which is to be used has not already been subjected to100000cycles or is not expected to reach that figure during the duration of the test. 1) For information on the availability of suitable apparatus to perform this test, apply to Enquiry Section, BSI, Linford Wood, Milton Keynes, MK146L
26、E quoting the number of this standard and the clause number referring to the items concerned. Enclose a stamped addressed envelope for reply.BS5131-3.6:1991 2 BSI 12-1999 Figure 1 Apparatus for abrading the shoe laceBS5131-3.6:1991 BSI 12-1999 3 6.2 Dry test method 6.2.1 Set the counter of the appar
27、atus(3.2) to zero. Fit a reference eyelet(3.3), clenched side downwards, into the apparatus. 6.2.2 Turn the driving mechanism of the apparatus by hand until the horizontally reciprocating clamp is as near as possible to the reference eyelet. This position corresponds to the lowest position of the te
28、nsioning mass. Insert and clamp one end of a test specimen in the horizontally reciprocating clamp. Pass the other end of the test specimen through the eyelet and hang from it the454g mass so that the underside of the mass is10mm or more clear of the cut-out switch below when the shoe lace is under
29、full tension. Turn the machine through a complete cycle by hand and ensure that, firstly, at the topmost point of the movement, the weight does not come out of its guide tube or off its guide rod secondly, where short lengths of shoe lace are being used as test specimens, the eyelets are being rubbe
30、d by the shoe lace for the whole of the cycle; and thirdly, that the shoe lace rubs against the part of the eyelet which has already been run in. 6.2.3 Start the machine and leave it to run continuously until the test specimen has broken. 6.2.4 Test the remaining five test specimens in the same mann
31、er. 6.3 Wet test method 6.3.1 Soak the test specimens by total immersion in distilled or deionized water at20 C for1h. When complete wetting of test specimens that are normally resistant to wetting is essential, an aqueous solution of not more than1g/L of a non-ionic wetting agent may be used instea
32、d of water. 6.3.2 Test the wet test specimens according to the procedure described in6.2. Re-wet the wet test specimens in situ at30min intervals. To do this, either drip the water directly onto the wet test specimen or apply the water using a soft brush. 7 Expression of results Record the number of
33、 cycles necessary for each shoe lace to break as a result of abrasion. Record the highest and lowest results of the six tests and the median value (the arithmetic mean of the middle two results). Record the results for the dry and wet tests separately. NOTESome types of shoe lace tend to give result
34、s with a skew distribution. In these circumstances, the median is a better guide to average performance than the arithmetic mean of all the results. 8 Test report The test report shall include the following items: a) type of the test specimens (i.e.shoe lace, or shoe lace and string) (see clause5);
35、b) number of cycles for each test specimen to break as a result of abrasion; c) results expressed in accordance with clause7; d) nature and full identification of the sample(s); e) reference to this method of test, i.e.BS5131-3.6; f) date of testing.BS5131-3.6: 1991 BSI 389 Chiswick High Road London
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