1、BRITISH STANDARD BS5131-4.5: 1990 Methods of Test for footwear and footwear materials Part4: Other components Section4.5 Tensile strength of fibreboard NOTEIt is recommended that this Section should be read in conjunction with BS5131-0, publishedseparately.BS5131-4.5:1990 This British Standard, havi
2、ng been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was published underthe authority of the BoardofBSI and comesintoeffecton 31December1990 BSI 12-1999 First published1976 Second edition1990 The following BSI references relate to the work on this standard: Co
3、mmittee reference TCM/39 Draft for comment89/36228DC ISBN 0 580 18757 8 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 the following bodi
4、es 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 Federation Institute of T
5、rading 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 Technology Centre The foll
6、owing bodies were 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. Amendments issued since public
7、ation Amd. No. Date CommentsBS5131-4.5:1990 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 Calculation and expression of results 2 8 Test report 2 Figure 1 Test
8、 specimen 2 Publication referred to Inside back coverBS5131-4.5:1990 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 It supersedes BS5131-4.5:1976, which is withdrawn.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 and 2, an inside back cover 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.BS5131-4.5:1990 BSI 12-1999 1 1 Scope This Section of BS5131 descri
11、bes a method for the determination of the tensile strength of fibreboard both in the air-conditioned state and in the wet state. Information provided by the results of the test is considered to provide a good guide to the general quality of the fibreboard. NOTEThe title of the publication referred t
12、o in this standard is listed on the inside back cover. 2 Principle Test specimens, cut from the fibreboard, are tested in a tensile testing machine after air conditioning or soaking with water. The force required to break the test specimen is determined in each case. 3 Apparatus 1) 3.1 Conditioning
13、cabinet or room, maintaining an atmosphere of20 2 C and652% r.h. 3.2 Tensile testing machine, with a range of0kN to5kN(0kgf to500kgf) plus one or more lower ranges (see6.3) and a rate of extension of100 20mm/min. 3.3 Measuring device, capable of measuring the width of the test specimens to an accura
14、cy of0.1mm. 3.4 Dial micrometer gauge, standing on a firm base and dead-weight loaded such that the presser foot applies a pressure of495kPa (5.0 0.5gf/mm 2 ). The gauge has a presser foot which is flat, circular, and10.0mm in diameter. The gauge complies with the accuracy requirements of BS907 and
15、has scale divisions of0.01mm. 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 5.1 From the conditioned sample of fibreboard cut six test spec
16、imens parallel to the machine direction of the board, and six test specimens parallel to the cross direction. Mark the twelve test specimens to show their orientation. Reserve three test specimens from each direction for testing in the air-conditioned state and three for testing after soaking in wat
17、er. 5.2 Cut each test specimen in the shape of a dumb-bell having the preferred dimensions shown in Figure 1. If the dimensions of the test specimen are such that the tolerances shown in Figure 1 are exceeded, the result of the test may be affected. Therefore, if for any reason test specimens of dif
18、ferent dimensions are tested by this procedure, include in the test report the dimensions of the test specimens, and ensure that these dimensions meet the following conditions. a) The width of the central narrow section is between10mm and30mm. b) The ratio of the length of the central section to its
19、 width is between3.5 and6.5. c) The width of the ends is at least1.2times the width of the central section. d) The ends are long enough to be properly gripped by the testing machine. e) The shoulders between the ends and the central section are rounded. 5.3 After cutting, examine the test specimens
20、and reject any that show signs of damage. 6 Procedure 6.1 Thickness Measure the thickness of each test specimen, using the dial micrometer gauge(3.4), at the centre of the narrow portion and at two points midway between the centre and the shoulders. 6.2 Width Measure the width to the nearest0.1mm, o
21、n one surface of each test specimen at the centre of the narrow portion and at two points midway between the centre and the shoulders, using a suitable device(3.3), thereby obtaining three width measurements. If the sides of the narrow portion of the test specimen are not at right angles to the surf
22、ace, take three such width readings for each surface, thereby obtaining six width measurements. 6.3 Dry test For each of the six test specimens to be tested dry, proceed as follows. 1) For information on the availability of suitable apparatus to perform this test apply to Enquiry Section, BSI, Linfo
23、rd Wood, Milton Keynes, MK146LE, quoting the number of this standard and the clause number referring to the item(s) concerned. Enclose a stamped addressed envelope for reply.BS5131-4.5:1990 2 BSI 12-1999 Set the tensile testing machine to a range such that the breakage of the test specimen is antici
24、pated to lie at a point between30% and100% of the range. Clamp the test specimen centrally in the jaws of the tensile testing machine(3.2). Start the tensile testing machine, and run it until the test specimen breaks. Record the breaking force, and stop the tensile testing machine. If the break does
25、 not occur within the narrow portion of the test specimen, prepare another test specimen as described in5.1 and repeat the test. If the break does not occur between10% and100% of the range, prepare another test specimen as described in5.1, set the tensile testing machine to a lower range and repeat
26、the test. Repeat the test until six valid test results are obtained. 6.4 Wet test Soak the six test specimens for wet testing in distilled or deionized water at20 2 C for6h, keeping them fully immersed but clear of the bottom of the vessel and of each other. Remove the test specimens from the water
27、one at a time, blot their surfaces, and immediately carry out on each the procedure described in6.3. 7 Calculation and expression of results 7.1 Calculate the mean of the measurements obtained in6.1 to give the thickness of each test specimen. 7.2 Calculate the mean of the measurements obtained in6.
28、2 to give the width of each test specimen. 7.3 Calculate the area of the cross section of each test specimen by multiplying the mean thickness by the mean width. 7.4 Calculate the tensile strength by dividing the force at breaking point (see6.3) by the area of cross section (see7.3) for each of the
29、following categories: a) air conditioned test specimens cut in the machine direction; b) air conditioned test specimens cut in the cross direction; c) soaked test specimens cut in the machine direction; d) soaked test specimens cut in the cross direction. Express each result correct to three signifi
30、cant figures. 8 Test report The test report shall include the following items: a) results expressed in accordance with7.4; b) nature and full identification of the sample; c) reference to this method of test, i.e.BS5131-4.5; d) details of any deviation from the preferred test specimen (see5.2); e) d
31、ate of testing. NOTEThe radii of curvature of the concave and convex curves which form the edge of the shoulders of the test specimen are equal, as judged by eye. Figure 1 Test specimenBS5131-4.5:1990 BSI 12-1999 Publication referred to BS907, Specification for dial gauges for linear measurement. BS
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