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 978-0-626-21407-4 SANS 5493:2008Edition 4.1 SOUTH AFRICAN NATIONAL STANDARD Ball burst strength of textile fabrics Published by Standards South Afri
4、ca 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 5493:2008 Edition 4.1 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 June 2008. This document supersedes SANS 54
6、93:2005 (edition 4). A vertical line in the margin shows where the text has been technically modified by amendment No. 1. SANS 5493:2008 Edition 4.1 1 Ball burst strength of textile fabrics 1 Scope This standard specifies a method for the determination of the ball burst strength of textile fabrics.
7、2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this standard. All standards are subject to revision and, since any reference to a standards 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 editions of the standard indicated below. Information on currently valid national and international standards can be obtained from Standards South Africa. SANS 250/ISO 10012, Measurement management s
9、ystems Requirements for measurement processes and measuring equipment. Amdt 1 SANS 5118 (SABS SM 118), Calibration and grading of machines for breaking strength test on textiles. Amdt 1 3 Principle A prescribed number of textile fabric test specimens is tested in accordance with a prescribed method
10、to determine the ball burst strength. Either the strength of each specimen or the arithmetic mean is reported. 4 Apparatus 4.1 Tensile testing machine A suitable power-driven tensile-strength testing machine (with a constant rate of traverse of the ring-clamp of 100 mm/min 10 mm/min), calibrated in
11、accordance with SANS 250. On the machine, choose the working range that will give the greatest accuracy. Use the ball burst attachment in place of jaws. Amdt 1 4.2 Ball burst attachment A ball burst attachment (see figure 1) consisting of a ring-clamp of internal diameter 44,450 mm 0,025 mm and suit
12、able for so securing a specimen that, when the machine is operated, the centre of the specimen is pressed (until it bursts) against a stationary polished steel ball of diameter 25,400 mm 0,025 mm. The direction of traverse of the ring-clamp shall be at right angles to the plane of its face. SANS 549
13、3:2008 Edition 4.1 2 5 Preparation of test specimens From each conditioned test sample, so cut 10 specimens, each of size 100 mm x 100 mm, that as many as possible of the yarns used in the manufacture of the fabric are represented. When selvedges are present, do not cut any specimen from nearer a se
14、lvedge than one-tenth of the width of the test sample. 6 Procedure Insert a specimen loosely in the ring-clamp, and, if necessary, stretch it uniformly by hand until it is taut, and then fasten it securely. Operate the machine and record the maximum force withstood by the specimen. Test the remainin
15、g specimens in the same way. 7 Calculation Either report the ball burst strength, in newtons, of each specimen or calculate the arithmetic mean of the 10 results and report it as the ball burst strength, in newtons, of the test sample. SANS 5493:2008 Edition 4.1 3 Figure 1 Typical ball burst attachment Standards South Africa
