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UDC 677106 : 620.192
IS0
FOR STA N DARD IZATl ON
INTERN AT I ON A L ORGAN I Z AT1 O N
IS0 RECOMMENDATION
R 675
DETERMINATION OF DIMENSIONAL CHANGE IN WOVEN FABRICS
SUBJECTED TO LAUNDERING NEAR THE BOILING POINT
1st EDITION
February 1968
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the oniy valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 675, Determination of dimensional change of woven fabrics
subjected to laundering near the boiling point, was drawn up by Technical Committee
ISO/TC 38, Textiles, the Secretariat of which is held by the British Standards Insti-
tution (BSI).
Work on this question by the Technical Committee began in 1952 and led, in
to the adoption of a Draft IS0 Recommendation.
1964,
In February 1966, this Draft IS0 Recommendation (No. 892) was circulated to
all the IS0 Member Bodies for enquiry. It was approved, subject to a few modifi-
cations of an editorial nature, by the following Member Bodies :
Argentina India Spain
Australia Sweden
Iran
Austria
Israel Swit zerland
Belgium Turkey
Japan
Canada Korea, Rep. of C.A.R.
Chile
Norway United Kingdom
Czechoslovakia Poland V.S.A.
Denmark Romania U. S.S.R.
Germany South Africa,
Rep. of
HLWary
--
Three Member Bodies opposed the approval of the Draft :
France
Italy
Netherlands
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council which decided, in February 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 675-1968 (E
. IS0 Recommendation R 675 February 1968
DETERMINATION OF DIMENSIONAL CHANGE IN WOVEN FABRICS
SUBJECTED TO LAUNDERING NEAR THE BOILING POINT
1. SCOPE
This IS0 Recommendation describes a method of test for determiningthe dimensional
of all types of woven fabrics normally subjected to
change (shrinkage or stretch)
commercial or home laundering near the boiling point.
NOTES
1. The test has been devised principally for cotton fabrics. If it is applied to other fabrics such as linen or rayon,
clause 7.5 should be consulted.
2. 71ie method is intended only for the assessment of dimensional changes undergone by a woven fabric subjected
to a single laundering. When it is desired to determine the amount of progressive dimensional change, the test
specimen may be washed repeatedly and the results reported so as clearly te indicate the amount of dimensional
change in the laundered specimen as compared with the original dimensions of the unwashed specimen and the
number of testing cycles to which the specimen has been subjected.
2. PRINCIPLE
A specimen is washed in a cylindrical reversing laundry machine under specified
conditions. It is extracted and pressed without preliminary drying. Distances marked
on the specimen in warp and weft (filling) directions are measured before and after
it is laundered.
3. REAGENTS
3.1 Detergent, soap
A stock solution may be prepared by dissolving O. 5 kg (I lb) of soap in 4litres
(I gallon CS) of hot water. When cooled, this solution forms a thick homo-
geneous jelly which may be used as required.
Soap meeting the following specification is satisfactory :
Moisture and volatile matter at 105 OC (221 OF) 10.0 % max.
Sum of free alkali, total matter insoluble in
alcohol, and sodium chloride 4.0 % max.
Free alkali, calculated as NaOH 0.2 % max.
Matter insoluble in water 1 .O % max.
Titre of the mixed fatty acids prepared
39 OC min.
from the soap
Anhydrous soap content 85.0 ’% min.
3.2 Water
Soft water (not more than 50 parts per million hardness should be used (see
Annex).
3.3 Anhydrous sodium carbonate
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ISO/R 675 -1968 (I
4. APPARATUS
Wash wheel
4.1
A horizontal cylindrical machine with rotating cage and reversing mechanism
should be used. The cage should have a diameter between 40 cm (16 in) and
60 cm (24 in) and a peripheral speed of 50 to 55 m/min (164 to 180 ft/min).
Other diameters may be used as a temporary measure, provided that the
speed of rotation is adjusted to give an equivalent peripheral speed. For pre-
ference use three or four fins of "lifters" about 8 cm (3 in) wide, equally
spaced around the interior of the cage and extending its full length. Either a
single fin or two fins may be used, however, provided that equivalent results
be obtained.
can
The cage should turn at such a speed that the load is lifted by the fins and
falls back into it. (A peripheral speed of 54 m/min (176 ft/min) has been
found satisfactory. ) The cage should make 5 to 1 O revolutions before reversing
its direction. The machine should be equipped with heating facilities, such as
live steam, gas or electricity, and with an outlet large enough to permit dis-
charge of all water from the machine in less than 2 minutes.
A thermometer in a suitable well, or equivalent equipment, should be pro-
vided to indicate the temperature of the water to within 1 OC during the washing
and there should be an outside water gauge to indicate the level
and rinsing,
of the water in the wheel.
The load to be run inthe machine should weigh between 8 and 50kg of air-dry
fabric per cubic metre (O. 5 to 3.1 lb per cubic foot) of cage space, includ-
It is made up of test specimens and as muchother
ing the volume of the fins.
similar fabric as required. The quantity of water used should be sufficient to
cover the load (from 1/7 to 1/3 of the inside diameter of the cage).
4.2
Extractor
A laundry-type centrifugai extractor with perforated basket, or equivalent
apparatus which does not distort the specimen, should be used and should be
a range between 50 and 100
capable of adjusting the moisture retention to
based on air-dry mass of the fabric.
NOTE. - Heavier fabrics of tight construction require a high moisture retention to ensure removal of
wrinkles during pressing.
Pressing equipment
4.3
A flat bed press capable of pressing a specimen 60cm x 60cm (24 in x 24 in)
is required and should be capable of providing a minimum pressure of 30 gf/cm2
(6.8ozf/in2). Thetemperatureofthepressshouldbe 150 ? 15OC(300 2- 30'F).
Marking equipment
4.4
See section 5.
4.5
Measuring scale
A rigid measuring rule, graduated in millimetres (or sixteenths of an inch)
or directly in the amount of shrinkage, marked as a percentage of the original
dimensions of the specimen (0.2% graduations), should be used.
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ISO/R 675 -1%8 (E
5. SPECIMEN
The specimen * is preferablythe fullwidth ofthe clothand at least 60 cm (24 in)long.
Cut it, do not tear it, fr
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