ISO 2971:1987
(Main)Cigarettes and filters — Determination of nominal diameter — Pneumatic method
Cigarettes and filters — Determination of nominal diameter — Pneumatic method
Cigarettes et filtres — Détermination du diamètre nominal — Méthode pneumatique
Cigarete in filtri - Določanje nominalnega diametra - Pnevmatska metoda
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IS0
INTERNATIONAL STANDARD
297 1
Second edition
1987-09-01
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEWYHAPOflHAR OPrAHM3AUMR Il0 CTAHAAPTM3AuMM
Cigarettes and filters - Determination of nominal
diameter - Pneumatic method
Cigarettes et filtres - Détermination du diamètre nominal - Méthode pneumatique
Reference number
[SO 2971 : 1987 (E)
---------------------- Page: 1 ----------------------
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
IS0 Council. They are approved in accordance with IS0 procedures requiring at
the
least 75 % approval by the member bodies voting.
International Standard IS0 2971 was prepared by Technical Committee ISO/TC 126,
Tobacco and tobacco products.
This second edition cancels and replaces the first edition (IS0 2971 : 1976), of which it
constitutes a technical revision.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
O International Organization for Standardization, 1987 0
Printed in Switzerland
---------------------- Page: 2 ----------------------
INTER NAT1 ON AL STANDARD IS0 2971 : 1987 (E)
Cigarettes and filters - Determination of nominal
diameter - Pneumatic method
O Introduction 4.2 nominal diameter of a measuring head QI: The
diameter in millimetres of the metal measuring rod ground to an
The determination of the diameter of cigarettes and filters is dif- accuracy of f 0,005 mm with which the reading is situated in
ficult to achieve with sufficient accuracy by usual metrology
the centre of the measuring range, this position corresponding
using a sliding caliper or a micrometer gauge, particularly to maximum sensitivity.
because of:
- possible distortion during measurement,
5 Principle
- a slight ovality in practice of the cigarettes and filters.
Introduction of the test piece into a measuring head having a
slightly larger circular cross-section through which compressed
It is therefore necessary to use a method overcoming these dif-
air is applied to the test piece, and determination of the average
ficulties, as with the use of a pneumatic instrument.
loss of pressure, which is directly related to the diameter of the
test piece.
1 Scope
6 Apparatus
This International Standard specifies a method for determining
the nominal diameter of cigarettes and filters by the pneumatic
measuring head process. Conditioning chamber, regulated in accordance with
6.1
the requirements of IS0 3402.
2 Field of application
Pneumatic micrometer, giving one reading, based on
6.2
the principle shown schematically in figure 1.
The method is generally applicable to cylindrically shaped
cigarettes and filters, enclosed in a wrapper having a
permeability to air less than 200 cm3/(min.cm2.kPa).
-
3 References
Compressed air at constant 4
pressure H -.-c
P
IS0 2965, Material used as cigarette papers - Determination of
S
air permeability.
IS0 3402, Tobacco and tobacco products - Atmospheres for
Figure 1 - Principle of a pneumatic micrometer
conditioning and testing.
Two apertures with cross-section Gand S are placed in series in
4 Definitions
an air circuit at constant pressure H. The pressure p which
exists between the two apertures depends directly on the ratio
For the purpose of this International Standard, the following
of cross-sections of these apertures. It is shown that
definitions apply.
H
4.1 nominal diameter of a cigarette or filter: The
P=
1 + k (S/G)2
diameter in millimetres of a cylindrical metal measuring rod
ground to an accuracy of f 0,005 mm giving in the same
G being the fixed Cross-section of the main jet, the pressurep
measuring head the same pressure reading (water height h) as
depends solely on Sand the variations inp reflect the variations
the cigarette or filter submitted to the measurement.
in S. In addition, if G is small, it is seen that slight variations in S
bring about large variations in p.
NOTE - By convention, it is accepted that the results obtained define
the nominal diameter of cigarettes or filters which may possibly not be
perfectly circular. k is a constant for the pneumatic micrometer used.
1
---------------------- Page: 3 ----------------------
IS0 2971 : 1987 (E)
IS0 3402). For newly manufactured cigarettes, conditioning is
S is the outflow cross-section between the measuring head
not necessary.
used and the test piece. The outflow at this aperture decreases
as the diameter of the test piece increases. A given outlet
section, and thus a certain pressure, corresponds to a given
7.2 Calibration
diameter. The scale of pressures can therefore be graduated
directly in diameters on the water column (in practice H - p is
For each measuring head (6.3) calibrate the apparatus using a
measured); it is sufficient to calibrate the apparatus
set of metal measuring rods (6.4).
beforehand.
Transfer to the graduated scale corresponding to each measur-
Measuring head (see annex B)
6.3
ing head the value of the diameter D of the metal measuring
-
inside diameter of the internal rings: nomin
...
SLOVENSKI STANDARD
SIST ISO 2971:1995
01-maj-1995
&LJDUHWHLQILOWUL'RORþDQMHQRPLQDOQHJDGLDPHWUD3QHYPDWVNDPHWRGD
Cigarettes and filters -- Determination of nominal diameter -- Pneumatic method
Cigarettes et filtres -- Détermination du diamètre nominal -- Méthode pneumatique
Ta slovenski standard je istoveten z: ISO 2971:1987
ICS:
65.160 7REDNWREDþQLL]GHONLLQ Tobacco, tobacco products
RSUHPD and related equipment
SIST ISO 2971:1995 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST ISO 2971:1995
---------------------- Page: 2 ----------------------
SIST ISO 2971:1995
IS0
INTERNATIONAL STANDARD
297 1
Second edition
1987-09-01
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEWYHAPOflHAR OPrAHM3AUMR Il0 CTAHAAPTM3AuMM
Cigarettes and filters - Determination of nominal
diameter - Pneumatic method
Cigarettes et filtres - Détermination du diamètre nominal - Méthode pneumatique
Reference number
[SO 2971 : 1987 (E)
---------------------- Page: 3 ----------------------
SIST ISO 2971:1995
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
IS0 Council. They are approved in accordance with IS0 procedures requiring at
the
least 75 % approval by the member bodies voting.
International Standard IS0 2971 was prepared by Technical Committee ISO/TC 126,
Tobacco and tobacco products.
This second edition cancels and replaces the first edition (IS0 2971 : 1976), of which it
constitutes a technical revision.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
O International Organization for Standardization, 1987 0
Printed in Switzerland
---------------------- Page: 4 ----------------------
SIST ISO 2971:1995
INTER NAT1 ON AL STANDARD IS0 2971 : 1987 (E)
Cigarettes and filters - Determination of nominal
diameter - Pneumatic method
O Introduction 4.2 nominal diameter of a measuring head QI: The
diameter in millimetres of the metal measuring rod ground to an
The determination of the diameter of cigarettes and filters is dif- accuracy of f 0,005 mm with which the reading is situated in
ficult to achieve with sufficient accuracy by usual metrology
the centre of the measuring range, this position corresponding
using a sliding caliper or a micrometer gauge, particularly to maximum sensitivity.
because of:
- possible distortion during measurement,
5 Principle
- a slight ovality in practice of the cigarettes and filters.
Introduction of the test piece into a measuring head having a
slightly larger circular cross-section through which compressed
It is therefore necessary to use a method overcoming these dif-
air is applied to the test piece, and determination of the average
ficulties, as with the use of a pneumatic instrument.
loss of pressure, which is directly related to the diameter of the
test piece.
1 Scope
6 Apparatus
This International Standard specifies a method for determining
the nominal diameter of cigarettes and filters by the pneumatic
measuring head process. Conditioning chamber, regulated in accordance with
6.1
the requirements of IS0 3402.
2 Field of application
Pneumatic micrometer, giving one reading, based on
6.2
the principle shown schematically in figure 1.
The method is generally applicable to cylindrically shaped
cigarettes and filters, enclosed in a wrapper having a
permeability to air less than 200 cm3/(min.cm2.kPa).
-
3 References
Compressed air at constant 4
pressure H -.-c
P
IS0 2965, Material used as cigarette papers - Determination of
S
air permeability.
IS0 3402, Tobacco and tobacco products - Atmospheres for
Figure 1 - Principle of a pneumatic micrometer
conditioning and testing.
Two apertures with cross-section Gand S are placed in series in
4 Definitions
an air circuit at constant pressure H. The pressure p which
exists between the two apertures depends directly on the ratio
For the purpose of this International Standard, the following
of cross-sections of these apertures. It is shown that
definitions apply.
H
4.1 nominal diameter of a cigarette or filter: The
P=
1 + k (S/G)2
diameter in millimetres of a cylindrical metal measuring rod
ground to an accuracy of f 0,005 mm giving in the same
G being the fixed Cross-section of the main jet, the pressurep
measuring head the same pressure reading (water height h) as
depends solely on Sand the variations inp reflect the variations
the cigarette or filter submitted to the measurement.
in S. In addition, if G is small, it is seen that slight variations in S
bring about large variations in p.
NOTE - By convention, it is accepted that the results obtained define
the nominal diameter of cigarettes or filters which may possibly not be
perfectly circular. k is a constant for the pneumatic micrometer used.
1
---------------------- Page: 5 ----------------------
SIST ISO 2971:1995
IS0 2971 : 1987 (E)
IS0 3402). For newly manufactured cigarettes, conditioning is
S is the outflow cross-section between the measuring head
not necessary.
used and the test piece. The outflow at this aperture decreases
as the diameter of the test piece increases. A given outlet
section, and thus a certain pressure, corresponds to a given
7.2 Calibration
diameter. The scale of pres
...
IS0
NORME INTERNATIONALE
297 1
Deuxième édition
1987-09-0 1
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXAYHAPOflHAR OPiAHMSAUMR il0 CTAHAAPTM3AUMM
Cigarettes et filtres - Détermination du diamètre
- Méthode pneumatique
nominal
Cigarettes and filters - Determination of nominal diameter - Pneumatic method
Numéro de référence
IS0 2971 : 1987 (F)
---------------------- Page: 1 ----------------------
L'ISO (Organisation internationale de normalisation) est une fédération mondiale
d'organismes nationaux de normalisation (comités membres de I'ISO). L'élaboration
des Normes internationales est normalement confiée aux comités techniques de I'ISO.
Chaque comité membre intéressé par une étude a le droit de faire partie du comité
technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec I'ISO participent également aux travaux.
Les projets de Normes internationales adoptés par les comités techniques sont soumis
aux comités membres pour approbation, avant leur acceptation comme Normes inter-
nationales par le Conseil de 1'1S0. Les Normes internationales sont approuvées confor-
mément aux procédures de I'ISO qui requièrent l'approbation de 75 % au moins des
comités membres votants.
La Norme internationale IS0 2971 a été élaborée par le comité technique ISO/TC 126,
Tabac et produits du tabac.
Cette deuxième édition annule et remplace la première édition (IS0 2971 : 1976), dont
elle constitue une révision technique.
L'attention des utilisateurs est attirée sur le fait que toutes les Normes internationales
sont de temps en temps soumises à révision et que toute référence faite à une autre
Norme internationale dans le présent document implique qu'il s'agit, sauf indication
contraire, de la dernière édition.
O Organisation internationale de normalisation, 1987
Imprimé en Suisse
---------------------- Page: 2 ----------------------
NORM E I NTE R NAT1 ON ALE IS0 2971 : 1987 (F)
Cigarettes et filtres - Détermination du diamètre
nominal - Méthode pneumatique
O Introduction 4.2 diamètre nominal d'une tête de mesurage (LIn):
Diamètre, en millimètres, de la pige métallique rectifiée à f
La détermination du diamètre des cigarettes et des filtres est
0,005 mm pour lequel la lecture se situe au milieu de l'échelle
' difficilement accessible avec une précision suffisante par la
des mesures, position qui correspond à la sensibilité maximale.
métrologie habituelle, à l'aide du pied à coulisse ou du palmer,
notamment à cause de
5 Principe
- la déformation possible au mesurage,
I)
Introduction de l'éprouvette dans une tête de mesurage de sec-
- I'ovalisation pratique légère,
tion circulaire légèrement supérieure par laquelle de l'air com-
primé est appliqué sur l'éprouvette, et détermination de la perte
des cigarettes et des filtres.
de charge moyenne qui est en relation directe avec le diamètre
de l'éprouvette.
II est donc nécessaire d'utiliser une méthode surmontant ces
difficultés, telle qu'une méthode employant un instrument
pneumatique.
6 Appareillage
1 Objet Enceinte de conditionnement, réglée selon les spécifi-
6.1
cations de I'ISO 3402.
La présente Norme Internationale spécifie une méthode de
détermination du diamètre nominal des cigarettes et des filtres,
6.2 Micromètre pneumatique à une lecture, basé sur le
par le procédé pneumatique à tête de mesurage.
principe illustré schématiquement sur la figure 1.
2 Domaine d'application
La méthode est généralement applicable aux cigarettes et aux
filtres de forme cylindrique, enveloppés dans un papier ayant
Air comprimé à pression I I
une perméabilité à l'air inférieure à 200 cms/(min .cmz.kPa).
a constante H -c -
MP I
G- S
3 Références
Figure 1 - Principe d'un micromètre pneumatique
IS0 2965, Matériaux utilisés comme papier à cigarettes -
Détermination de la perméabiïité à rair.
Le principe de l'appareil repose sur l'utilisation de deux orifices
IS0 3402. Tabac et produits du tabac - Atmosphères de con-
de section G et S placés en série sur un circuit d'air à pression
ditionnement et &essai.
constante H. La pression p qui règne entre les deux orifices
dépend directement du rapport des sections de ces orifices. On
démontre que
4 Définitions
H
4.1 diamètre nominal d'une cigarette ou d'un filtre: Dia-
P=
1 + k (S/G)2
mètre, en millimètres, d'une pige métallique cylindrique recti-
fiée à f 0,005 mm, donnant, dans une même tête de mesu-
G étant la section fixe du gicleur de tête, la pression p dépend
rage, la même indication de pression (hauteur d'eau h), que la
uniquement de Set les variations dep reflètent les variations de
cigarette ou le filtre soumis à la mesure.
S. D'autre part, si G est petit, on voit que de faibles variations
de S se traduisent par de fortes variations de p.
NOTE - Par convention, il est admis que les résultats obtenus définis-
sent le diamètre nominal de cigarettes ou de filtres qui, éventuellement,
peuvent ne pas être parfaitement circulaires.
k est une constante pour le micromètre pneumatique utilisé.
1
---------------------- Page: 3 ----------------------
IS0 2971 : 1987 (FI
S est la section de fuite entre la tête de mesurage utilisée et (voir IS0 3402). Pour les cigarettes fraîchement fabriquées, le
conditionnement n'est pas nécessaire.
l'éprouvette. S diminue quand le diamètre des éprouvettes aug-
A un diamètre donné correspond une section de fuite
mente.
donnée, donc une certaine pression. On peut ainsi graduer
7.2 Étalonnage
l'échelle des pressions directement en diamètres sur la colonne
d'eau (en pratique on mesureH - p); il suffit d'étalonner préa-
Pour chaque tête de mesurage (6.3) étalonner l'appareil à l'aide
lablement l'appareil.
du jeu de piges métalliques (6.4).
6.3 Tête de mesurage (voir annexe B)
Porter sur l'échelle graduée
...
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