SANS 960:2005 SOUTH AFRICAN NATIONAL STANDARD

SANS 960:2005 SOUTH AFRICAN NATIONAL STANDARD
Licensed exclusively to SABS.
Copying and network storage prohibited.
ISBN 978-0-626-24038-7
SANS 960:2005
Edition 4
SOUTH AFRICAN NATIONAL STANDARD
Textiles — Dimensional stability during
washing and drying procedures
Published by SABS Standards Division
1 Dr Lategan Road Groenkloof Private Bag X 191 Pretoria 0001
Tel: +27 12 428 7911 Fax: +27 12 344 1568
www.sabs.co.za
© SABS
Licensed exclusively to SABS.
Copying and network storage prohibited.
SANS 960:2005
Edition 4
Table of changes
Change No.
Date
Scope
Foreword
This South African standard was approved by National Committee SABS SC 38E, Textile test
methods – Dimensional stability & wet tests, in accordance with procedures of the SABS Standards
Division, in compliance with annex 3 of the WTO/TBT agreement.
This edition cancels and replaces the second revision (SABS SM 960:1994).
Reaffirmed and reprinted in June 2011.
This standard will be reviewed every 5 years and
either be reaffirmed, amended, revised or withdrawn.
Licensed exclusively to SABS.
Copying and network storage prohibited.
SANS 960:2005
Edition 4
Textiles — Dimensional stability during washing and drying
procedures
1 Scope
This standard specifies a method of determining the effect of washing and drying procedures on the
dimensional stability of fabrics, garments and other textile articles. Seven washing procedures and
five drying procedures are described. A complete test consists of a washing and a drying
procedure.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute
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 agreements
based on this standard are encouraged to take steps to ensure the use of the most recent editions
of the standards indicated below. Information on currently valid national and international standards
can be obtained from the SABS Standards Division.
ISO 6330, Textiles – Domestic washing and drying procedures for textile testing.
SANS 70, Conditioning of textiles and standard temperate atmosphere for determining their
physical and mechanical properties.
SANS 651, Low-foam laundry detergent (for use in automatic and non-automatic domestic washing
machines).
SANS 3759/ISO 3759, Textiles – Preparation, marking and measuring of fabric specimens and
garments in tests for determination of dimensional change.
3 Principle
A specimen is marked, conditioned, measured and then washed in an automatic washing machine
and dried in accordance with the appropriate specified procedures. After reconditioning, the
specimen is remeasured and the dimensional change is calculated.
1
Licensed exclusively to SABS.
Copying and network storage prohibited.
SANS 960:2005
Edition 4
4 Apparatus and reagents1)
4.1 Automatic washing machine, of the front-loading, rotating drum type, as follows:
a) Dimensions of rotating drum: diameter 515 mm ± 5 mm, depth 335 mm ± 5 mm, with three lifting
vanes each of height 50 mm ± 5 mm that extend the full depth of the drum and that are spaced
120° apart.
b) Rotating action of drum:
1) normal action: 12 s ± 0,1 s clockwise, 3 s ± 0,1 s stop, 12 s ± 0,1 s anticlockwise, 3 s ± 0,1 s
stop; and
2) gentle action: 3 s ± 0,1 s clockwise, 12 s ± 0,1 s stop, 3 s ± 0,1 s anticlockwise, 12 s ± 0,1 s
stop.
c) Rotating speed of drum: 52 r/min during washing; 530 r/min ± 20 r/min during hydro-extraction
(spin).
d) Water supply: tap water at 20 °C ± 3 °C. The machine has a filling time of approximately 6 min
when filled to the high dip level, and a draining time of approximately 1 min when drained from
the high dip level.
e) Heating: electric, thermostatically controlled.
NOTE Other types of horizontal drum machines, that have been determined to give comparable results, may
be used but in cases of dispute, it is recommended that the specified machine be used.
4.2 Marking and measuring equipment, that complies with the relevant requirements of
SANS 3759.
4.3 Ballast (loading cloths, make-weights), in the form of square pieces of knitted 100 %
polyester or woven polyester/cotton fabric of side length in the range 300 mm to 500 mm and of
mass in the range 180 g/m2 to 220 g/m2. (The ballast should be replaced at suitable intervals.)
4.4 Detergent, either ECE test detergent or IEC test detergent, as specified in ISO 6330, or a
commercial detergent that complies with the requirements of SANS 651. (See also NOTE to 6.1.)
4.5 Flat-bed press, that has an operating temperature of 150 °C ± 15 °C and that is capable of
drying the specimen to below its conditioned mass and of applying sufficient pressure to remove
any creases from the specimen.
4.6 Rotary tumble dryer, that
a) has a cylindrical basket of diameter approximately 750 mm and of depth approximately 450 mm;
b) is capable of operating at a rotating speed of approximately 30 r/min;
1) Details of a suitable washing machine, flat-bed press, tumble dryer and detergents can be obtained from the
SABS Standards Division.
2
Licensed exclusively to SABS.
Copying and network storage prohibited.
SANS 960:2005
Edition 4
c) is equipped with a means of maintaining a drying temperature of approximately 70 °C, measured
in the exhaust vent as close as possible to the drying cylinder; and
d) has a facility for providing a cooling period of 5 min at the end of the drying cycle.
4.7 Screen drying racks, of meshed stainless steel or of suitable plastics material.
4.8 Suitable facilities for drip-drying or line drying.
5 Preparation of test specimens
5.1 Prepare and mark the test specimen in accordance with SANS 3759.
5.2 Condition the test specimen in accordance with SANS 70, and then measure the conditioned
test specimen in accordance with SANS 3759.
6 Washing procedures
NOTE Information and guidance about suitable applications for the washing procedures are given in annex A.
6.1 Select the appropriate washing procedure given in table 1, as specified in the relevant product
specification or as agreed upon between the parties concerned.
NOTE Use the ECE test detergent, unless use of the IEC test detergent or a commercial detergent is
specified in the relevant product specification or agreed upon between the parties concerned.
Table 1 — Washing procedures
1
2
3
4
6
7
8
D
D1
3,8 to 4,0
3,8 to 4,0
Washing procedure
Test conditions
A
Mass of conditioned load
(including ballast), kg
5
A1
B
B1
C
3,8 to 4,0 3,8 to 4,0 1,9 to 2,0 1,9 to 2,0 1,9 to 2,0
Rotating action of drum
Normal
Normal
Normal
Normal
Gentle
Gentle
Normal
Washing temperature, °C
90 ± 3
60 ± 3
60 ± 3
50 ± 3
40 ± 3
40 ± 3
40 ± 3
Actual washing time, min
45
45
30
30
15
15
30
Liquor volume, L
40 ± 3
a)
Liquor level (for washing
and rinsing procedures), mm
Detergent
a
240 ± 5
Sufficient (1 g/L to 3 g/L) to form good running suds of height 20 mm to 30 mm.
Measured from the bottom of the outer cage.
6.2 Weigh the conditioned test specimen, together with sufficient conditioned ballast, to make up a
wash load of the required mass appropriate to the procedure selected. Not more than half of the
wash load shall consist of test specimens.
3
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