EN ISO 9073-9:2008

SLOVENSKI STANDARD
01-julij-2008
1DGRPHãþD
EN ISO 9073-9:1998
Tekstilije - Metode preskušanja vlaknovin - 9. del: Ugotavljanje togosti na podlagi
koeficienta zastira (ISO 9073-9:2008)
Textiles - Test methods for nonwovens - Part 9: Determination of drapability including
drape coefficient (ISO 9073-9:2008)
Textilien - Prüfverfahren für Vliesstoffe - Teil 9: Bewertung des textilen Falls
einschließlich des Fallkoeffizienten (ISO 9073-9:2008)
Textiles - Méthodes d'essai pour nontissés - Partie 9: Détermination du drapé et du
coefficient de drapé (ISO 9073-9:2008)
Ta slovenski standard je istoveten z: EN ISO 9073-9:2008
ICS:
59.080.30 Tkanine Textile fabrics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 9073-9
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2008
ICS 59.080.30 Supersedes EN ISO 9073-9:1998
English Version
Textiles - Test methods for nonwovens - Part 9: Determination of
drapability including drape coefficient (ISO 9073-9:2008)
Textiles - Méthodes d'essai pour nontissés - Partie 9: Textilien - Prüfverfahren für Vliesstoffe - Teil 9: Bewertung
Détermination du drapé et du coefficient de drapé (ISO des textilen Falls einschließlich des Fallkoeffizienten (ISO
9073-9:2008) 9073-9:2008)
This European Standard was approved by CEN on 21 March 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9073-9:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 9073-9:2008) has been prepared by Technical Committee ISO/TC 38 "Textiles" in
collaboration with Technical Committee CEN/TC 248 “Textiles and textile products” the secretariat of which is
held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by October 2008, and conflicting national standards shall be withdrawn at
the latest by October 2008.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 9073-9:1998.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 9073-9:2008 has been approved by CEN as a EN ISO 9073-9:2008 without any modification.

INTERNATIONAL ISO
STANDARD 9073-9
Second edition
2008-04-01
Textiles — Test methods for
nonwovens —
Part 9:
Determination of drapability including
drape coefficient
Textiles — Méthodes d'essai pour nontissés —
Partie 9: Détermination du drapé et du coefficient de drapé

Reference number
ISO 9073-9:2008(E)
©
ISO 2008
ISO 9073-9:2008(E)
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ii © ISO 2008 – All rights reserved

ISO 9073-9:2008(E)
Contents Page
Foreword. iv
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle. 2
5 Apparatus . 3
6 Sampling. 4
7 Preparation and conditioning of test specimens . 5
8 Preliminary procedures. 5
9 Method A, using rings of paper. 6
10 Method B, using image processing technology. 7
11 Precision. 12

ISO 9073-9:2008(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. Each 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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 9073-9 was prepared by Technical Committee ISO/TC 38, Textiles.
This second edition cancels and replaces the first edition (ISO 9073-9:1995), which has been technically
revised.
ISO 9073 consists of the following parts, under the general title Textiles — Test methods for nonwovens:
⎯ Part 1: Determination of mass per unit area
⎯ Part 2: Determination of thickness
⎯ Part 3: Determination of tensile strength and elongation
⎯ Part 4: Determination of tear resistance
1)
⎯ Part 5: Resistance to mechanical penetration (ball burst procedure)
⎯ Part 6: Absorption
⎯ Part 7: Determination of bending length
⎯ Part 8: Determination of liquid strike-through time (simulated urine)
⎯ Part 9: Determination of drapability including drape coefficient
⎯ Part 10: Lint and other particles generation in the dry state
⎯ Part 11: Run-off
⎯ Part 12: Demand absorbency
⎯ Part 13: Repeated liquid strike-through time

1) To be published.
iv © ISO 2008 – All rights reserved

ISO 9073-9:2008(E)
⎯ Part 14: Coverstock wetback
⎯ Part 15: Determination of air permeability
⎯ Part 16: Determination of resistance to penetration by water (hydrostatic pressure)
⎯ Part 17: Determination of water penetration (spray impact)
⎯ Part 18: Determination of breaking strength and elongation of nonwoven materials using the grab tensile
test
ISO 9073-9:2008(E)
Introduction
This part of ISO 9073 is a revision of the current drape evaluation method, ISO 9073-9:1995, Textiles — Test
methods for nonwovens —– Part 9: Determination of drape coefficient. With a conventional method using
rings of paper, some manual operations of an expert, such as contour marking, mark cutting, weighting and
comparing of weights are necessary. With this new proposed method using image processing technology with
a digital camera, various drapability parameters can be easily obtained through simple and automatic
operations. For the determination of drape coefficient, both the conventional method and the automatic
method are available. Additionally, using the automatic method, drape shape parameters and statistical
information, including drape wave amplitude, wavelength and number of nodes, can be quantitatively obtained
from a captured image. For automatic evaluation, some attachments to the conventional drape tester are
needed and they include a frame and a stand for supporting the digital camera.

vi © ISO 2008 – All rights reserved

INTERNATIONAL STANDARD ISO 9073-9:2008(E)

Textiles — Test methods for nonwovens —
Part 9:
Determination of drapability including drape coefficient
1 Scope
This part of ISO 9073 specifies a test method that is used to determine the drape coefficient of fabrics
(nonwovens, wovens and knitted fabrics).
SI values are regarded as the official standard system of measurement for this standard test method.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 139:2005, Textiles — Standard atmospheres for conditioning and testing
ISO 186:2002, Paper and board — Sampling to determine average quality
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
drapability
ability of a circular specimen of fabric of known size to deform when suspended under specified conditions
3.2
node number
one of the drape shape parameters expressed in the number of drape waves/folds
3.3
wave amplitude
one of the drape shape parameters indicating the size (in centimetres) of the most dominant drape
waves/folds
3.4
wavelength
one of the drape shape parameters indicating the wavelength of the most dominant drape waves/folds
expressed in degrees of a circle (0° to 360°)
3.5
minimum amplitude
one of the statistics indicating the smallest size of drape wave/folds present, expressed in centimetres
ISO 9073-9:2008(E)
3.6
maximum amplitude
one of the statistics indicating the largest size of drape wave/folds present, expressed in centimetres
3.7
average amplitude
one of the statistics indicating the mean drape wave/folds present, expressed in centimetres
3.8
variance
one of the statistics indicating the distribution of the drape wave/folds amplitude, expressed in centimetres
3.9
Fourier transform/original and dominant/original
the three fitness factors to verify the fit of the Fourier transformation and to determine the dominant wave,
expressed as percentages
3.10
coefficient of drapability
drape coefficient
ratio between the area of the projected shadow of the draped specimen, expressed as a percentage, and the
area of the undraped (flat) specimen
4 Principle
The circular specimen of the fabric being tested is held horizontally between smaller concentric discs, and the
exterior ring of fabric is allowed to drape into folds around the lower supporting disc. Both of the following
evaluation methods are available in this procedure and are listed as methods A and B.
Method A, using rings of paper
The shadow of the draped specimen is cast from below onto a ring of paper of known mass and of the same
size as the unsupported part of the test specimen. The outline of the shadow is traced onto the ring of paper
and the paper is then cut along the trace of the shadow. The drape coefficient is the mass of that part of the
paper ring representing the shadow, expressed as a percentage of the mass of the whole paper ring.
Method B, using image processing technology
The shadow of the draped specimen is cast from below onto a white sheeting covering the top translucent lid
and centre-plates. Detailed quantitative information on the drapability of the test specimen is obtained from
digital images captured with a commercial digital camera (or a scanner) after cutting the paper around its
shadow contour. The captured images, initially having grey levels, are transformed into monochrome images
through noise filtering and thresholding. The two-dimensional monochrome images of draped shadows
described above are firstly transformed into polar (∅, r) coordinates as shown in Figure 1, where the X-axis
from 0° to 360° is the angle, in degrees, from the baseline passing through the centre of the circle, and r
(Y-axis) is the amplitude, in centimetres. The shape parameters of a two-dimensional geometric drape model
defined as the number of nodes (waves or folds), the positions of nodes, wavelength and amplitude data and
various statistical information, can then be obtained using image processing technology and frequency
analysis as well as the traditional drape coefficient. A three-dimensional drape shape can be regenerated from
its captured two-dimensional drape images, with a three-dimensional simulator.
2 © ISO 2008 – All rights reserved

ISO 9073-9:2008(E)
Figure 1 — Sample of the software printout
5 Apparatus
5.1 Apparatus for methods A and B
5.1.1 Drape meter.
This comprises
⎯ a box-like apparatus with a translucent lid, see Figure 2,
⎯ two horizontal discs, 18 cm in diameter, between which the test specimen is held, the lower disc having a
central locating pin,
⎯
...