SIST EN ISO 1973:1999

SLOVENSKI STANDARD
SIST EN ISO 1973:1999
01-marec-1999
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Textile fibres - Determination of linear density - Gravimetric method and vibroscope
method (ISO 1973:1995)
Textilien-Fasern - Bestimmung der Feinheit - Gravimetrisches Verfahren und
Schwingungsverfahren (ISO 1973:1995)
Fibres textiles - Détermination de la masse linéique - Méthode gravimétrique et méthode
au vibroscope (ISO 1973:1995)
Ta slovenski standard je istoveten z: EN ISO 1973:1995
ICS:
59.060.01 Tekstilna vlakna na splošno Textile fibres in general
SIST EN ISO 1973:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 1973:1999

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SIST EN ISO 1973:1999

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SIST EN ISO 1973:1999

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SIST EN ISO 1973:1999

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SIST EN ISO 1973:1999

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SIST EN ISO 1973:1999
INTERNATIONAL
ISO
STANDARD
1973
Second edition
1995-11-01
Textile fibres
- Determination of linear
density - Gravimetric method and
vibroscope method
Fibres textiles - Determination de Ia masse lin6ique -
Methode
gravimk Pique et methode au vibroscope
Reference number
ISO 1973: 1995(E)

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SIST EN ISO 1973:1999
ISO 1973:1995(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The work
of preparing International Standards is normally carried out through ISO
technical committees. Esch member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 1973 was prepared by Technical Committee
ISO/TC 38, Textiles, Subcommittee SC 6, Fibre testing.
This second edition cancels and replaces the first edition
(ISO 1973:1976), which has been technically revised.
Annexes A and B of this International Standard are for information only.
0 ISO 1995
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland

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SIST EN ISO 1973:1999
INTERNATIONAL STANDARD 0 ISO ISO 1973:1995(E)
Textile fibres - Determination of linear density -
Gravimetric method and vibroscope method
ISO 6989: 1981, Textile fibres - Determination of
1 Scope
length and length distribution of staple fibres (by
measuremen t of Single fibres).
This International Standard specifies a gravimetric
method and a vibroscope method for the determi-
nation of the linear density of textile fibres applicable
3 Definitions
respectively to:
For the purposes of this International Standard, the
a) bundles of fibres;
following definitions apply.
b) individual fibres.
3.1 tension: Forte tending to Cause the extension
of a body.
Useful data tan be obtained on man-made fibres and,
with less precision, on natura1 fibres.
NOTE 2 In textile testing, the tension applied is based on
the linear density or Cross-sectional area.
The procedures tan be applied only to fibres which
tan be kept straight and, in the case of bundles, par-
3.2 tensioning forte: Forte effective on a fibre
allel, during test preparation. These methods are
specimen during the vibroscope test.
properly applicable when the fibres are readily freed
of crimp. They are not applicable to tapered fibres.
4 Principle
NOTE 1 The vibroscope method may not be applicable
to hollow and flat (ribbon-like) fibres.
Two methods for determining linear density are de-
scribed:
2 Normative references
4.1
Gravimetric method (direct method by
weighing), for bundles of fibres
The following Standards contain provisions which,
through reference in this text, constitute provisions
Spetimens of a given length are weighed on a bal-
of this International Standard. At the time of publica-
ante. This method is applicable to bundles of fibres.
tion, the editions indicated were valid. All Standards
are subject to revision, and Parties to agreements
4.2 Vibroscope method, for individual fibres
based on this International Standard are encouraged
to investigate the possibility of applying the most re-
Individual fibres of a given length and under specified
cent editions of the Standards indicated below.
tension are subjected to Vibration at resonance fre-
Members of IEC and ISO maintain registers of cur-
quency. The linear density is determined from the
rently valid International Standards.
conditions of the resonance state, i.e. the resonance
frequency, the length of the fibre and the tensioning
- Standard atmospheres for
ISO 139: 1973, Textiles
forte. The linear density is read directly on the scale
conditioning and testing.
of the vibroscope apparatus. This method assumes
ISO 1130:1975, Textile fibres - Some methods of that the linear density of the tested length of the fibre
sampling for tes ting. is constant.

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SIST EN ISO 1973:1999
CJ ISO
ISO 1973:1995(E)
NOTE 3 For high-modulus fibres (e.g. aramid fibres) the
the laboratory Sample is representative of that sam-
use of the vibroscope method should be agreed on by the
ple, sampling shall be carried out in accordance with
interested Parties, because the high stiffness of such fibres
ISO 1130.
may influence the results.
8 Procedure
5 Apparatus
8.1 Gravimetric method
5.1 Gravimetric method
8.1.1 Condition the test specimens and carry out the
5.1.1 Balance, suitable for weighing the bundles of
tests in the Standard atmosphere for testing as spec-
fibres to an accuracy of at least + 1 %.
-
ified in clause 6.
5.12 Device for cutting the bundles under tension
8.1.2 From the laboratory test Sample, take ten tufts
to a length known within an accuracy of + - 1 % and
having a mass of several milligrams and bring the fi-
allowing an adjustment of the tension of the bundles
bres of each tuft into parallel alignment by carefully
to be tut.
combing them several times with the combsorter
(5.1.3).
For example, two razor blades set parallel in a suitable
holder may be used.
8.1.3 Cut the middle part of each combed tuft to a
given length (as great as possible), under the mini-
5.1.3 Combsorter, for preliminary alignment of fi-
mum tension necessary to remove crimp, by means
bres.
of the cutting device (5.1.2). Take the necessary
precautions so that there are no free fibre ends any-
5.1.4 Textile support fabric, of a colour contrasting
where except at the two ends of the tut bundle.
with th at of the fibres to be teste d .
8.1.4 Place the ten bundles so obtained on the tex-
plate, measuring approximately
5.1.5 Glass
tile support fabric (5.1.4) and cover them with the
100 mm x 200 mm, with one polished edge.
glass plate (5.1.5) from the polished edge of which
they shall protrude slightly.
5.1.6 Forceps.
8.1.5 From each of the ten bundles in turn, take out
5.2 Vibroscope method
five fibres so as to form a bundle of 50 fibres, in each
case drawing the fibres from one tut end. Make at
5.2.1 Vibroscope ‘1, having the following accuracy:
least ten of these bundles. Recondition the specimen
in the atmosphere specified in clause 6, if necessary.
a) The applied tensioning forte shall be within the
Weigh these bundles individually, using the balance
range of $- 0,5 % of the specified value;
(5.1 .l ), to an accuracy of 1 %.
b) The error in the vibroscope reading of resonance
NOTE 4 If the bundle of 50 fibres cannot be weighed on
frequency measured or applied shall not exceed
the balance to the required 1 % accuracy, the number of fi-
+ 0,5 %;
-
bres may be increased up to 500.
c) The error in the vibroscope reading of Vibration
8.2 Vibroscope method
length of the fibre shall not exceed + 1 %.
-
8.2.1 Check the vibroscope, before examining the
6 Conditioning and testing atmospheres
laboratory test Sample, as follows. Test 100 individual
fibres using the vibroscope in question. Test these
The atmospheres for preconditioning, conditioning
Same fibres, for comparison, using the gravimetric
and testing shall be in accordance with ISO 139.
method. Calculate the arithmetic mean and coefficient
of Variation of the vibroscope readings of linear den-
sity. If the coefficient of Variation of the vibroscope
7 Sampling
readings is larger than 10 %, the Sample is not suit-
To ensure that the labora tory sam ple i s represe ntative able for determination of linear density using this
of the ma
...