ISO 3308:1986
(Main)Cigarettes — Routine analytical cigarette-smoking machine — Definitions and standard conditions
Cigarettes — Routine analytical cigarette-smoking machine — Definitions and standard conditions
Cigarettes — Machine à fumer analytique de routine pour cigarettes — Définitions — Conditions normalisées
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International Standard @ 3308
INTF RNATIONAL ORGANIZATION FOR STANDARDIZATIONOME~Y~A~RHAR OPrAHM3AUMR Il0 CTAHRAPTM3AUMM~ORGANlSATlON INTERNATIONALE DE NORMALISATION
Cigarettes - Routine analytical cigarette-smoking
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- Definitions and standard conditions
machine
Cigarettes - Machine à fumer analytique de routine pour cigarettes - Définitions et conditions normalisées
Second edition - 1986-12-15
UDC 663.974 : 620.1 Ref. No. IS0 3308-1986 (E)
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Descriptors : tobacco, cigarettes, smoking machines, definitions, specifications, testing conditions.
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Price based on 8 pages
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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
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 3308 was prepared by Technical Committee ISO/TC 126,
I
Tobacco and tobacco products.
This second edition cancels and replaces the firsbedition (IS0 3308-19773, 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, 1986 O
Printed in Switzerland
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INTERNATIONAL STANDARD IS0 3308-1986 (E)
Cigarettes - Routine analytical cigarette-smoking
machine - Definitions and standard conditions
O Introduction 3.4 free smoking : The condition that exists when the butt
end of a cigarette is, completely exposed to the atmosphere be-
This International Standard includes the requirements found tween successive puffs.
necessary in the light of knowledge and experience gained with
analytical cigarette-smoking machines.
3.5 pressure drop : The difference in static pressure be-
tween any two points of the pneumatic circuit of a smoking
Other aspects relevant to an International Standard on
machine which are passed by a current of air at a constant flow
mechanical smoking include methods of test for smoking
rate of 17.5 ml/s.
machines, cigarette sampling and expression of results. From
work on these aspects, amendment of the clauses set out
NOTE - The term draw resistance has a very similar meaning. To
below may prove necessary in a future revision.
avoid any confusion the term draw resistance is used for cigarettes and
filter rods, whereas the term pressure drop is used by analogy in the
case of the pneumatic circulation in a smoking machine.
1 Scope and field of application
3.6 puff duration : The interval of time during which a dif-
This International Standard
ference in pressure is applied between the two ends of a
cigarette.
- defines the smoking parameters and specifies the stan-
dard conditions to be provided for the routine analytical
3.7 puff volume : The volume leaving the butt end of a
machine smoking of cigarettes;
cigarette in the interval of time during which there is a pressure
- difference between the two ends of the cigarette.
specifies requirements for a routine analytical smoking
machine complying with the standard conditions.
puff number : The number of puffs necessary to smoke
3.8
NOTE - Annex A describes, by way of example, the special
a cigarette to a specified butt length.
characteristics of a typical smoking machine incorporating a piston
type of puffing mechanism.
puff frequency : The number of puffs in a given time.
3.9
Annex B includes a diagram of a puff profile and illustrates certain
definitions and standard conditions.
puff termination : The ending of the difference in
3.10
pressure applied between the two ends of the cigarette.
2 Reference
3.11 puff profile : The flow rate measured directly behind
IS0 7210, Smoking machines for tobacco and tobacco
the butt end of a cigarette, and depicted graphically as a func-
products - Non-routine test methods.
tion of time.
3.12 dead volume : The volume which exists between the
3 Definitions
butt end of a cigarette and the suction source.
3.1 ambient conditions : The whole of the variable
cigarette holder : The device for holding the butt end
3.13
parameters physically characterizing the conditions in the room
of a cigarette during smoking.
and environment in which the analytical smoking is carried out.
3.14 smoke trap : The device for collecting such smoke
butt length : The length of unburnt cigarette remaining
3.2
from a sample of cigarettes as is necessary for the determina-
at the moment when the smoking is stopped.
tion of specified smoke components.
3.15 port : The aperture of the puffing mechanism through
3.3 restricted smoking : The condition that exists when
which a puff is drawn and to which is attached a smoke trap
the butt end of a cigarette is closed to the atmosphere between
and/or a cigarette.
successive puffs.
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IS0 3308-1986 (E)
4.6 Restricted smoking
3.16 channel : An element of a smoking machine consisting
of one or more cigarette holders, one trap and a means of
An analytical smoking machine shall be a restricted smoker.
drawing a puff through the trap.
3.17 compensation : The ability to maintain constant puff 4.7 Free smoking
volumes and puff profiles when the pressure drop at the port
Free smoking is not covered by this International Standard.
changes.
3.18 cigarette position : The position of a cigarette on the 4.8 Puff number
smoking machine. In particular it is detemined by the angle
Each individual puff shall be counted and recorded, and the
made by the longitudinal axis of the cigarette and the horizontal
plane when a cigarette is inserted into a cigarette holder in an puff number rounded off to the nearest one-tenth of a puff on
the basis of the puff duration.
analytical smoking machine.
mainstream smoke : All smoke which leaves the butt 4.9 Butt length
3.19
end of a cigarette during the smoking process.
The standard butt length is 23 mm except for cigarettes with a
filter longer than 15 mm, which shall be smoked to the greater
3.20 sidestream smoke : All smoke which leaves a
of the following two lengths :
cigarette during the smoking process other than from the butt
end.
- length of filter + 8 mm, or
- length of filter overwrap + 3 mm.
NOTE - The "filter overwrap" is the external material which joins the
4 Standard conditions
tobacco rod to the filter tirx
4.1 Machine pressure drop
4.10 Cigarette holders
The pressure drop shall not exceed 300 Pa (3 mbar). The whole
The standard cigarette holder shall cover 9 mm, with a stan-
of the flow path between the butt end of the cigarette and the
dard deviation of CJ = 0,5 mm, from the butt end of a cigarette
suction source shall offer the least possible resistance.
and shall be impermeable to smoke components and to air. The
standard cigarette holder shall ensure that the leakage between
the cigarette and the cigarette holder is not greater than 0,5 %
4.2 Puff duration
of the puff volume. The draw resistance of the unlit cigarette
shall not significantly increase when it is held in the cigarette
The standard puff duration shall be 2,O s, with a standard
holder.
deviation of Q = 0,05 s for individual puffs.
4.3 Puff volume 4.11 Cigarette position
The angle formed by the longitudinal axis of the cigarette and
The standard puff volume shall be 35 ml measured on an unlit
(I)
cigarette, with a standard deviation for individual puffs of the horizontal plane shall be as small as possible; it shall not
exceed IOo if the centre of of the butt end is lower than the cen-
CJ = 0,25 ml. In one puff duration not less than 95 % of the
tre of the other end and 5O if the centre of the butt end is higher
puff volume shall leave the butt end of the cigarette.
than the centre of the other end.
4.4 Puff frequency
The ports shall be arranged so that no cigarette influences the
burning of any other cigarette.
The standard puff frequency shall be one puff every 60 s, with
a standard deviation for this time of Q = 0.5 s.
4.5 Puff profile
5 Specification for the routine analytical
smoking machine
The puff profile when measured on an unlit cigarette shall be
bell-shaped with a maximum between 0,8 s and 1,2 s from the
The smoking machine shall comply with the standard condi-
start of puffing. The increasing and decreasing parts of the pro-
tions (see 4.1 to 4.1 1) and the following special conditions.
of inflection each. The
file shall not have more than one point
maximum flow rate shall lie between 25 ml/s and 30 ml/s (see
annex 6). The curve may be amputated up to 0,02 s from the
5.1 Operating principle and puff profile
start (see A.2.2).
The machine shall include a device to draw a fixed volume of air
by applying a difference in pressure
NOTE - A description of an example of a puffing mechanism using a (puff) through a cigarette
piston pump to obtain the puff profile is given in annex A. between the front (lit) end and the butt end of the cigarette.
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IS0 3308-1986 (E)
5.1.1 The machine shall produce a bell-shaped puff profile The system shall be designed to prevent losses of smoke con-
stituents between the butt end of the cigarette and the smoke
(see 4.5).
trap.
5.1.2 The machine shall be a restricted smoker (3.3).
The distance between the butt end of the cig
...
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