1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21225-4 SANS 5323:2008Edition 3.1SOUTH AFRICAN NATIONAL STANDARD Breaking strength of seams in textiles Published by Standards South Afric
4、a 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 5323:2008 Edition 3.1 Table of changes Change No. Date Scope Amdt 1 2008 Amended to update the referenced standard. Foreword This
5、South African standard was approved by National Committee StanSA SC 5110.04D, Textile test methods Physical tests, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This document was published in July 2008. This document supersedes SANS 532
6、3:2005 (edition 3). A vertical line in the margin shows where the text has been technically modified by amendment No. 1. SANS 5323:2008 Edition 3.1 1 Breaking strength of seams in textiles 1 Scope This standard specifies a method for the determination of the breaking strength of seams in textiles. 2
7、 Normative reference The following standard contains provisions which, through reference in this text, constitutes provisions of this standard. All standards are subject to revision and, since any reference to a standard is deemed to be a reference to the latest edition of that standard, parties to
8、agreements based on this standard are encouraged to take steps to ensure the use of the most recent edition of the standard indicated below. Information on currently valid national and international standards can be obtained from Standards South Africa. SANS 1095 (SABS SM 95), Breaking strength of t
9、extile fabrics: grab method. Amdt 1 SANS 13934-2/ISO 13934-2:2008, Textiles Tensile properties of fabrics Part 2: Determination of maximum force using the grab method. Amdt 1 3 Principle The breaking strength of a prescribed number of specimens with a seam is determined in accordance with a prescrib
10、ed method. The highest force during the breaking (individual results and mean value) and details about where the break occurred on each specimen are reported. 4 Apparatus a) Testing machine. As described in section 6 of SANS 13934-2:2008. Amdt 1 b) Template. A rigid template having the shape and dim
11、ensions shown in figure 1. SANS 5323:2008 Edition 3.1 2 Figure 1 Template for the preparation of test specimens 5 Preparation of test specimens From the conditioned sample prepare six test specimens by so placing the template on the seam under test that the notches in the template coincide with the
12、appropriate of the following: a) when there is a single row of stitches: the row of stitches; b) when there are two or more rows of stitches: the midpoint between the two outer rows of stitches; or c) when the seam has been bonded only: the midpoint in the width of the seam. Mark the outline of the
13、test specimen on the fabric of the test sample by drawing around the outside (but ignoring the notches) of the template. Draw the jaw-positioning marks (see figure 1 and figure 2) and then cut out the test specimen. Figure 2 Positioning of the test specimen in the jaws SANS 5323:2008 Edition 3.1 3 6
14、 Procedure 6.1 Set the testing machine so that the free distance between the jaws is 75 mm at the start of the test. Clamp the conditioned test specimen symmetrically in the jaws, with the longer dimension parallel to and the shorter dimension (and seam) at right angles to the direction of applicati
15、on of the force. Clamp the test specimen in such a way that the jaw-positioning marks on the fabric are aligned with the jaws of the machine (see figure 2). 6.2 Operate the machine, record the highest force registered during the breaking of the test specimen, and note whether failure occurred in a)
16、the body of the fabric, b) the fabric at the seam, c) the sewing thread, or d) two or all of the above. NOTE When a test specimen slips in the jaws, breaks at a jaw, or, for any other reason attributable to faulty operation, shows a result markedly below the average for the set of specimens, discard
17、 the result and, where possible, carry out a duplicate test on another specimen. Include the value so obtained in the average of the set of test specimens. If a duplicate test cannot be made, use the results of the valid tests, provided that these number not less than five. 7 Calculation Calculate the arithmetic mean of the forces recorded, and record the individual results, the mean value, and the part(s) in which failure occurred (see 6.2). Standards South Africa
