WO2024235949A1

WO2024235949A1 - Aerosol-generating system with adjustable ventilation

Info

Publication number: WO2024235949A1
Application number: PCT/EP2024/063188
Authority: WO
Inventors: Matteo Bologna; CHEUNG (張), Yiu Chi (耀之)
Original assignee: Philip Morris Products S.A.
Priority date: 2023-05-17
Filing date: 2024-05-14
Publication date: 2024-11-21

Abstract

An aerosol-generating device (210) is provided, configured to receive a rod-shaped aerosol-generating article (220), the aerosol-generating article having a plurality of perforations (224) arranged in a side wall (214) of the aerosol-generating article, the aerosol-generating device includes a housing defining a device cavity at a mouth end (202) of the aerosol-generating device having a central longitudinal axis, wherein the device cavity is configured to at least partially receive the aerosol-generating article. The aerosol-generating device also includes a movable collar member (230), extending axially at least partially around the central longitudinal axis from the device cavity at the mouth end of the aerosol-generating device, and an actuator (236) engaged with the moveable collar member. The collar member is selectively moveable relative to the central longitudinal axis from a first position, in which the plurality of perforations are uncovered, to a second position in which at least some of the plurality of perforations are covered by the collar member.

Description

AEROSOL-GENERATING SYSTEM WITH ADJUSTABLE VENTILATION

[0001] The present invention relates to an aerosol-generating system, including an aerosolgenerating device configured to receive an aerosol-generating article, with adjustable ventilation. [0002] Aerosol-generating articles in which an aerosol-forming substrate, such as a tobaccocontaining substrate, is heated rather than combusted, are known in the art. Typically in such heated smoking articles, an aerosol is generated by the transfer of heat from a heat source to a physically separate aerosol-forming substrate or material, which may be located in contact with, within, around, or downstream of the heat source. During use of the aerosol-generating article, volatile compounds are released from the aerosol-forming substrate by heat transfer from the heat source and are entrained in air drawn through the aerosol-generating article. As the released compounds cool, they condense to form an aerosol.

[0003] A number of prior art documents disclose aerosol-generating devices for consuming aerosol-generating articles. Such devices include, for example, electrically heated aerosol generating devices in which an aerosol is generated by the transfer of heat from one or more electrical heater elements of the aerosol-generating device to the aerosol-forming substrate of a heated aerosolgenerating article.

[0004] Aerosol-generating articles are known that include ventilating perforations (referred to as a ‘ventilation zone’) on its outer wrapper. During use of the article within the aerosol-generating device, the ventilating perforations provide dilution of the aerosol flowing through the article to be delivered to the consumer.

[0005] Known systems have a peripheral wall of the aerosol-generating device arranged to overlie the ventilation zone of the aerosol-generating article. This arrangement ensures that, during use of the aerosol generating system, the ventilation zone of the aerosol-generating article is covered by the housing of the aerosol-generating device and is not exposed to the exterior of the device. Additionally, this means that the ventilation zone can serve its function of providing ventilation to the article without being obscured or blocked by a consumer.

[0006] Use of known ventilating aerosol-generating systems in warmer environments, such as tropical climates, results in the aerosol delivered to the consumer at an increased temperature which is unpleasant for the user, a so called 'warm aerosol perception phenomenon'.

[0007] It is an aim of certain examples of the present invention to solve, mitigate or obviate, at least partly, at least one of the problems and/or disadvantages associated with the prior art. [0008] According to an aspect of the invention, there is provided an aerosol-generating device configured to receive a rod-shaped aerosol-generating article, the aerosol-generating article having a plurality of perforations arranged in a side wall of the aerosol-generating article, the aerosolgenerating device including: a housing defining a device cavity at a mouth end of the aerosol-generating device having a central longitudinal axis, wherein the device cavity is configured to at least partially receive the aerosol-generating article, a collar member extending axially at least partially around the central longitudinal axis from the device cavity at the mouth end of the aerosol-generating device, wherein at least one of the collar member and the received aerosol-generating article is selectively moveable relative to the central longitudinal axis from a first position, in which the plurality of perforations are uncovered, to a second position in which at least some of the plurality of perforations are covered by the collar member.

[0009] According to a further aspect of the invention, there is provided an aerosol-generating device configured to receive a rod-shaped aerosol-generating article, the aerosol-generating article having a plurality of perforations arranged in a side wall of the aerosol-generating article, the aerosol-generating device including: a housing defining a device cavity at a mouth end of the aerosol-generating device having a central longitudinal axis, wherein the device cavity is configured to at least partially receive the aerosol-generating article; a moveable collar member extending axially at least partially around the central longitudinal axis from the device cavity at the mouth end of the aerosol-generating device; and an actuator engaged with the collar member; wherein the collar member is selectively moveable relative to the central longitudinal axis from a first position, in which the plurality of perforations are uncovered, to a second position in which at least some of the plurality of perforations are covered by the collar member.

[0010] According to another aspect of the invention, there is provided an aerosol-generating system, the aerosol-generating system including: a rod-shaped aerosol-generating article including a plurality of perforations arranged in a side wall of the aerosol-generating article; an aerosol-generating device including: a housing defining a device cavity at a mouth end of the aerosol-generating device having a central longitudinal axis, wherein the device cavity is configured to at least partially receive the aerosol-generating article, and a collar member extending axially at least partially around the central longitudinal axis from the device cavity at the mouth end of the aerosol-generating device; and wherein at least one of the collar member and the aerosol-generating article is selectively moveable relative to the central longitudinal axis from a first position, in which the plurality of perforations are uncovered, to a second position in which at least some of the plurality of perforations are covered by the collar member.

[0011] In certain known aerosol-generating systems, ventilation zones provide dilution of the aerosol flowing through the aerosol-generating article to be delivered to the consumer. The amount of dilution is dependent upon a predetermined porosity of the ventilation zone in order to permit air to be drawn into the aerosol-generating article to dilute the aerosol. That is, the ventilation level of the aerosol-generating article, is predetermined by selecting the number and / or the size of the perforations in the ventilation zone, as well as by selecting a side wall and the layers underneath the side wall with desired permeability to air.

[0012] Known systems have a peripheral wall of the aerosol-generating device arranged to overlie the ventilation zone of the aerosol-generating article. This arrangement ensures that, during use of the aerosol generating system, the ventilation zone can serve its function of providing a predetermined ventilation of air to the article without being inadvertently obscured or blocked by a consumer.

[0013] Aspects of the present invention provides an aerosol-generating device or an aerosolgenerating system in which the ventilation level is adjustable by a user. In contrast to known aerosol-generating systems and aerosol-generating devices, the user is able to optimise the ventilation level to produce a comfortable level of aerosol. In particular, the user is able to adjust dilution of the aerosol produced by the aerosol-generating article during use to mitigate warm aerosol perception phenomenon.

[0014] The user is able to optimise the ventilation level of the aerosol-generating article to produce improved nucleation of the aerosol. In particular, the user may easily and readily determine a preferred dilution setting for the aerosol-generating device so that a consistent ventilation level is achieved for subsequent aerosol-generating articles. [0015] Moreover, with at least some aspects of the present invention, the user is also able to change or otherwise adjust the resistance-to-draw (RTD) of the aerosol-generating device and article, for example to adjust the RTD value to a his or her preferred level.

[0016] Furthermore, the invention provides adjustable ventilation levels for an aerosol-generating article in a simple manner by use of convenient collar member. In particular, the collar member is incorporated into the aerosol-generating system without substantially increasing manufacturing complexity.

[0017] The moveable collar member may extend axially at least partially around the central longitudinal axis from the device cavity at the mouth end of the aerosol-generating device. That is the moveable collar member extends both axially from the device cavity at the mouth end of the aerosol-generating device and at least partially around the central longitudinal axis from the device cavity.

[0018] An inner surface of the collar member may be dimensioned to be in contact with the side wall of the aerosol-generating article at an area where the plurality of perforations are provided when the aerosol-generating article is at least partially received into the device cavity. In this way, each perforation may be effectively blocked or sealed by the collar member to prevent fluid flow through the respective perforation or perforations. Fluid flow through the ventilation zone through any uncovered perforations is more consistent.

[0019] The aerosol-generating device may include an actuator engaged with the collar member and the aerosol-generating article. The actuator is arranged to be manually operable to selectively move either the collar member or the aerosol-generating article from the first position to the second position.

[0020] An actuator may be engaged with the collar member and the aerosol-generating article. The actuator is arranged to be manually operable to selectively move either the collar member or the aerosol-generating article from the first position to the second position.

[0021] The collar member may include an actuator projecting radially outwards from the collar member. The actuator is arranged to project through an elongate slot through a peripheral wall of the housing. The actuator is selectively moveable relative to the elongate slot.

[0022] In these ways, the user may control relative movement between the collar member and the aerosol-generating device more easily. [0023] The device cavity may be cylindrically-shaped and have a diameter to allow rotation of the aerosol-generating article around the central longitudinal axis when the aerosol-generating article is at least partially received in the device cavity. In this way, the aerosol-generating article is moveable between the first position and the second position, and vice versa.

[0024] The aerosol-generating article may be moveable relative to the aerosol-generating device by rotating around the central longitudinal axis. The aerosol-generating article may be moveable to a first intermediary position and a second intermediary position between the first position and the second position. Each intermediary position is a rotational position of the aerosol-generating article, relative to the aerosol-generating device. That is, a rotational position between the first position of the aerosol-generating article and the second position of the aerosol-generating article.

[0025] The aerosol-generating article may be free to rotate entirely around the central longitudinal axis. The aerosol-generating article may be positioned relative to the aerosol-generating device so that the collar member covers all but one of the series of perforations.

[0026] By providing relative movement, for example rotational movement, of the aerosolgenerating article the user may selective a position for the collar member more easily.

[0027] The aerosol-generating system may include a visual guide. The visual guide may include an indicator to show the relative rotational position of the aerosol-generating article around the central longitudinal axis. In certain examples, a visual guide may be provided on one or more of the aerosol-generating article or the aerosol-generating device. A visual guide may be provided on the collar member of the aerosol-generating device.

[0028] The aerosol-generating article may include an indicator on the side wall. The indicator may be configured to be covered by a tip of the edge portion as the aerosol-generating article rotates within the device cavity. In this way, the indicator provides a user with a visual guide as to the dilution corresponding to the rotational position of the aerosol-generating article.

[0029] The indicator, or a portion of the indicator, may be aligned with the edge portion as the aerosol-generating article rotates within the device cavity.

[0030] The visual guide may include an indicator and a registration mark.

[0031] A portion of the indicator, may be aligned with a registration mark provided on the collar portion. The indicator, or a portion of the indicator, may be aligned with a registration mark provided on the peripheral wall at the mouth end of the aerosol-generating device. [0032] The indicator, or a portion of the indicator, may be provided on either the collar portion or provided on the peripheral wall at the mouth end of the aerosol-generating device, and configured to be aligned with a registration mark provided on the aerosol-generating article.

[0033] In these ways, a visual guide, or a part of the visual guide allows the user to readily determine rotational orientation of the aerosol-generating article within the aerosol-generating device.

[0034] The collar member may include an annular core. The collar member may be mounted to the aerosol-generating device with the annular core arranged to be coaxial with the central longitudinal axis. The aerosol-generating article is mounted within the device cavity by passing through the annular core.

[0035] The collar member may include a locating element configured to mount the collar member to a complementary engagement means within in the device cavity. Typically, the locating element mounts the collar member to an engagement means provided on an inner surface of the peripheral wall. Any suitable locating element and engagement means may be provide so as to give a limited relative axial movement between the collar member and aerosol-generating device. For example, the collar member may mounted using complementary clipping or snap-fitting parts. The complementary clipping or snap-fitting parts may be formed of a rigid, or semi-rigid, or soft material, including one or more of a plastic material, an elastomer material, or a metal material.

[0036] The collar may also be mounted with other suitable means, including screws, magnetic engagement or adhesive provided on a sub-assembly. For example, the complementary clipping or snap-fitting parts may provide an interference fit. The locating element may include a series of axial ribs on the collar member and with the engagement means formed as a series of corresponding grooves on the inner surface of the peripheral wall. Each groove on the inner surface of the peripheral wall may be configured to receive an axial rib and allow axial movement along each groove.

[0037] In these ways, the collar member may be formed so as to be provide simple assembly to the aerosol-generating device. Manufacturing costs of the aerosol-generating device are reduced.

[0038] The collar member may include at least one projecting portion arranged to extend axially away from the peripheral wall at the mouth end of the aerosol-generating device.

[0039] The at least one projecting portion may be one of a series of projecting portions arranged circumferentially around the collar member with a gap between each projecting portion. [0040] The at least one projecting portions may be regularly spaced apart. In particular, a spacing of the at least one projecting portions may match with a spacing of the plurality of perforations.

[0041] The collar member may be configured to cover the plurality of perforations in the second position.

[0042] The collar member may include a series of projecting portions arranged circumferentially around the collar member with a gap between each projecting portion.

[0043] Each projecting portion may extend sufficiently to span a circumferential distance on the side wall of an aerosol-generating article to cover a perforation and a region of the side wall between the perforation and each of the adjacent perforations.

[0044] The gaps between each projecting portion may correspond to a circumferential length of a perforation of the plurality of perforations.

[0045] By providing suitable projecting portions and gaps, the effect of the collar member on fluid flow through the underlying perforations may be readily designed into the collar member. The RTD may be more easily controlled by the collar member. The collar member thereby may be modified easily to provide a range of predetermined dilution rates of the aerosol.

[0046] The collar member may be moveably mounted to the aerosol-generating device, typically at the mouth end of the aerosol-generating device.

[0047] The collar member may be slidably mounted to the aerosol-generating device to move axially from the first position to the second position.

[0048] In the first position, the collar member may be retracted within the device cavity. In the second position, the collar member may extend an axial distance from the mouth end of the aerosolgenerating device. The axial distance at the second position may be in a range of from 1mm to 40mm, or in a range of from 1mm to 30mm, or in a range of from 1mm to 25mm, or in a range of from 1mm to 15mm, or in a range of from 1mm to 3mm.

[0049] The collar member may be further selectively moveable relative to the central longitudinal axis to at least one intermediary position. The intermediary position may be at a position between the first position and the second position. The intermediary position may any one of a first intermediary position, a second intermediary position, a third intermediary position or any one of a series of intermediary positions. The axial distance at an intermediary position may be in a range of from 1mm to 40mm, or in a range of from 1mm to 30mm, or in a range of from 1mm to 25mm, or in a range of from 1mm to 15mm, or in a range of from 1mm to 3mm. The axial distance at an intermediary position may 1mm from the first position, or 2mm from the first position, or 3mm from the first position, or 5mm from the first position, or 10mm from the first position, or 20mm from the first position. The axial distance at an intermediary position may 1mm from the second position, or 2mm from the second position, or 3mm from the second position, or 5mm from the second position, or 10mm from the second position, or 20mm from the second position.

[0050] In the intermediary position, the collar member may partially cover the plurality of perforations. In the second position, the collar member may cover the plurality of perforations.

[0051] In the intermediary position, the collar member at least partially covers a first proportion of the plurality of perforations. In the second position, the collar member at least partially covers a different, second proportion of the plurality of perforations.

[0052] In the second position, the collar member may cover both the first proportion of the plurality of perforations and the second proportion of the plurality of perforations.

[0053] By providing one or more intermediary positions between the first position and the second position, the collar member may provide an incremental adjustment of the fluid flow through the ventilation zone. That is, the collar member may provide a range of dilution settings. The aerosolgenerating device, and the aerosol-generating system, may be more adaptable to varying climates.

[0054] The first proportion of the plurality of perforations may be distributed around the ventilation zone at a first axial position, and the second proportion of the plurality of perforations may be distributed around the ventilation zone at a second axial position.

[0055] The first proportion of the plurality of perforations may include a number of perforations in the range from 1 to 20.

[0056] The second proportion of the plurality of perforations may include a number of perforations in the range from 1 to 20.

[0057] The aerosol-generating device may be configured so that the aerosol-generating article is moveably mountable to the aerosol-generating device. The aerosol-generating article may be rotatable around the central longitudinal axis of the device cavity.

[0058] The collar member may be fixedly mounted to the mouth end of the aerosol-generating device. The collar member may be integrally formed with the peripheral wall. In these ways, the number of parts is optimised, reducing manufacturing costs.

[0059] The collar member may include at least one projecting portion. The at least one projecting portion may be a wedge-shaped projecting portion including a base portion extending circumferentially around the collar member, and an edge portion depending from the base portion at an angle to the base portion.

[0060] The edge portion may be oriented to give a helical edge portion.

[0061] The edge portion may define a cut-out portion of the collar member.

[0062] The aerosol generating article may have a rod-shaped form and including a plurality of perforations circumferentially arranged around a side wall.

[0063] The plurality of perforations may be distributed axially along the aerosol-generating article so that, in rotating the aerosol-generating article from the first position to the second position, the projecting portion at least partially covers an increasing proportion of the plurality of perforations.

[0064] The plurality of perforations may be distributed circumferentially around the aerosolgenerating article. The perforations may be circumferentially-spaced apart around the aerosolgenerating article. The perforations may be circumferentially-spaced at an angular spacing in the range of from 18 degrees to 72 degrees, or at an angular spacing in the range of from 25 degrees to 60 degrees. The perforations may be circumferentially-spaced at an angular spacing according to the equation

360 degrees n where n is whole number selected from the list: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20.

[0065] The plurality of perforations may include a first proportion of perforations and a second proportion of perforations. The plurality may include a third proportion of perforations. The plurality may include a fourth proportion of perforations. In an example, a first proportion of perforations may be interspaced circumferentially between a second proportion of perforations, for example to provide alternating larger and smaller perforations, where the first proportion of perforations are larger in cross-sectional area and the second proportion of perforations are smaller in cross-sectional area. In an example, the distribution of perforations may include a series of the first proportion of perforations followed circumferentially by a series of the second proportion of perforations.

[0066] The aerosol-generating article may be further selectively moveable relative to the central longitudinal axis to at least one intermediary position, typically at a position between the first position and the second position. [0067] In the intermediary position, the collar member may partially cover the plurality of perforations. In the second position, the collar member may cover the plurality of perforations.

[0068] In the intermediary position, the collar member may at least partially cover a first proportion of the plurality of perforations. In the second position, the collar member may cover a different, second proportion of the plurality of perforations.

[0069] In the second position, the collar member may cover both the first proportion and the second proportion of the plurality of perforations.

[0070] Each perforation of the first proportion of the plurality of perforations may have a first cross-sectional area and each perforation of the second proportion of the plurality of perforations may have a second cross-sectional area. The second cross-sectional area may be greater than the first cross-sectional area. In this way, each proportion of perforations may provide different rates of air infusion for the user.

[0071] The aerosol-generating device may further include a heater for heating an aerosol-forming substrate provided in the aerosol-generating article at least partially received within the device cavity. The aerosol-generating device may include a power source for supplying power to the heater. A controller may also provide control such supply of power to the heater. The heater may be configured to heat the aerosol-generating article during use, when the aerosol-generating article is received within the aerosol-generating device.

[0072] The aerosol-generating article may include a fluid reservoir suitable for use with an electrically operated aerosol-generating device. The fluid contained in the fluid reservoir forms an aerosol when heated. The aerosol-generating system may include a heater for heating the fluid of the fluid reservoir to form an aerosol. The heater may be mounted within the aerosol-generating article of the aerosol-generating system. The aerosol-generating article may include a wicking element to controllably release fluid from the fluid reservoir to the heater.

[0073] As used herein, movement of parts relative to the central longitudinal axis may mean rotation of a first member around the central longitudinal axis relative to the second member, may mean translation of a first member along the central longitudinal axis relative to the second member, or may mean concurrent rotation of the first member around the central longitudinal axis and translation of the first member along the central longitudinal axis relative to the second member.

[0074] As used herein, to "partially cover" refers to positioning a first member, including at least one perforation, and a second member in order to limit or restrict fluid communication between the ambient atmosphere and the perforation. For example, relative movement between a collar member and an aerosol-generating article may partially cover a perforation with an element of the collar member so that the effective surface area of the perforation is reduced. Fluid flow into the perforation from the ambient atmosphere is thereby decreased.

[0075] As used herein, to "cover" refers to positioning a first member, including at least one perforation, and a second member in order to block fluid communication between the ambient atmosphere and the perforation. For example, relative movement between a collar member and an aerosol-generating article may cover a perforation with an element of the collar member so that the effective surface area of the perforation is substantially zero. Fluid flow into the perforation from the ambient atmosphere is prevented.

[0076] As used herein, “uncover” refers to positioning a first member, including at least one perforation, and a second member without limiting or restricting fluid communication between the ambient atmosphere and the perforation. For example, relative movement between a collar member and an aerosol-generating article may uncover a perforation so that the effective surface area of the perforation is the whole surface area of each perforation. Fluid flow into the perforation from the ambient atmosphere is unobstructed.

[0077] As used herein, “at least partially received”, refers to a first member receiving at least a proportion of a second member therein. That is, the second member may be wholly received in within the first member, or the second member received within the first member leaving a portion of the second member external to the first member.

[0078] As used herein, a “peripheral wall” refers to the outer casing or outer layer of the aerosolgenerating device.

[0079] As used herein, “integrally formed” refers to first member that is adjoined to a second member. The first member is in a fixed position relative to the second member. For example, a collar member may be integrally formed with a peripheral wall of an aerosol-generating device so that the collar member is in a fixed position relative to the peripheral wall.

[0080] As used herein, a “gap” refers to a circumferential spacing between adjacent members. That is, an opening or slot is provided in a circumferential direction between adjacent members.

[0081] As used herein, “at an angle” refers to the relative non-parallel orientation between members or axes. For example, an edge portion of a projecting portion may be at an angle to, that is non-parallel to, a circumferentially-extending base portion. [0082] As used herein, a “side wall” may be any suitable outer jacket or casing of the aerosolgenerating article. The side wall may be a wrapper or other flexible sheet. The side wall may be formed from a cellulose-based material, for example a paper material or a cardboard material. The side wall may be formed from a plastic material or from a metal such as aluminium.

[0083] As used herein, "perforation" refers to at least one opening or fluid passageway through the side wall, or through at least one layer of the side wall. The opening or fluid passageway may be provide through one or more of: a wrapper, a wrapper and sub-layer material combination, a permeable region within a wrapper, or a permeable region within a sub-layer material.

[0084] The invention is defined in the claims. However, below there is provided a non-exhaustive list of non-limiting examples. Any one or more of the features of these examples may be combined with any one or more features of another example, embodiment, or aspect described herein.

[0085] Example Exl : An aerosol-generating device configured to receive a rod-shaped aerosolgenerating article, the aerosol-generating article having a plurality of perforations arranged in a side wall of the aerosol-generating article, the aerosol-generating device including: a housing defining a device cavity at a mouth end of the aerosol-generating device having a central longitudinal axis, wherein the device cavity is configured to at least partially receive the aerosol-generating article; a collar member extending axially at least partially around the central longitudinal axis from the device cavity at the mouth end of the aerosol-generating device; wherein at least one of the collar member and the received aerosol-generating article is selectively moveable relative to the central longitudinal axis from a first position, in which the plurality of perforations are uncovered, to a second position in which at least some of the plurality of perforations are covered by the collar member.

[0086] Example Ex2: An aerosol-generating device according to example Exl, further including an actuator engaged with the collar member and the aerosol-generating article, wherein the aerosolgenerating device is arranged to be manually operable to selectively move either the collar member or the aerosol-generating article from the first position to the second position.

[0087] Example Ex3: An aerosol-generating device according to example Exl or example Ex2, wherein the device cavity is cylindrically-shaped and has a diameter to allow rotation of the aerosolgenerating article around the central longitudinal axis when the aerosol-generating article is at least partially received in the device cavity, so that the aerosol-generating article is moveable between the first position and the second position, and vice versa. [0088] Example Ex4: An aerosol-generating device according to any of examples Exl to Ex3, wherein the collar member includes an actuator projecting radially outwards from the collar member, and wherein the actuator is arranged to project through an elongate slot through a peripheral wall of the housing.

[0089] Example Ex5: An aerosol-generating device according to example Ex4, wherein the actuator is selectively moveable relative to the elongate slot.

[0090] Example Ex6: An aerosol-generating device according to any of examples Exl to Ex5, further including an electro-mechanical means operably engaged with at least one of the collar member and the aerosol-generating article to selectively move either the collar member or the aerosol-generating article from the first position to the second position.

[0091] Example Ex7: An aerosol-generating device according to any of examples Exl to Ex6, wherein collar member includes an annular core, and wherein the collar member is mounted to the aerosol-generating device with the annular core arranged to be coaxial with the central longitudinal axis.

[0092] Example Ex8: An aerosol-generating device according to example Ex7, wherein the aerosol-generating article is mounted within the device cavity by passing through the annular core. [0093] Example Ex9: An aerosol-generating device according to any of examples Exl to Ex8, wherein the collar member includes a locating element configured to mount the collar member to a complementary engagement means within in the device cavity.

[0094] Example ExlO: An aerosol-generating device according to any of examples Exl to Ex9, wherein the collar member includes at least one projecting portion arranged to extend axially away from the peripheral wall at the mouth end of the aerosol-generating device.

[0095] Example Exl 1 : An aerosol-generating device according to example ExlO, wherein the at least one projecting portion is a series of projecting portions arranged circumferentially around the collar member with a gap between each projecting portion.

[0096] Example Exl 2: An aerosol-generating device according to example Exl 1, wherein the at least one projecting portions are regularly spaced apart, and wherein a spacing of the at least one projecting portions matches with a spacing of the plurality of perforations of the received the aerosol-generating article.

[0097] Example Exl3: An aerosol-generating device according to any of examples Exl to Exl2, wherein the collar member is configured to cover the plurality of perforations in the second position. [0098] Example Exl4: An aerosol-generating device according to any of examples Exl to Exl3, further including a heater for heating an aerosol-forming substrate provided in the aerosolgenerating article at least partially received within the device cavity.

[0099] Example Exl5: An aerosol-generating device according to any of examples Exl to Exl4, wherein the collar member is moveably mounted to the aerosol-generating device.

[0100] Example Exl 6: An aerosol-generating device according to example Exl 5, wherein the collar member is moveably mounted to the mouth end of the aerosol-generating device.

[0101] Example Exl 7 An aerosol-generating device according to example Exl 5 or Exl 6, wherein the collar member is slidably mounted to the aerosol-generating device to move axially from the first position to the second position.

[0102] Example Exl 8: An aerosol-generating device according to example Exl 7, wherein the aerosol-generating device is configured so that, in the first position, the collar member is retracted within the device cavity and, in the second position, the collar member extends an axial distance from the mouth end of the aerosol-generating device.

[0103] Example Exl 9: An aerosol-generating device according to example Exl 8, wherein the axial distance is in a range of from 1mm to 12mm and, optionally, in a range of from 2mm to 6mm.

[0104] Example Ex20: An aerosol-generating device according to any of examples Exl to Exl 9, wherein the collar member includes a series of projecting portions arranged circumferentially around the collar member with a gap between each projecting portion.

[0105] Example Ex21 : An aerosol-generating device according to example Ex20, wherein each projecting portion extends sufficiently to span a circumferential distance on the side wall of an aerosol-generating article to cover a perforation and a region of the side wall between the perforation and each of its adjacent perforations.

[0106] Example Ex22: An aerosol-generating device according to example Ex20, wherein the gaps between each projecting portion corresponds to a circumferential length of a perforation of the plurality of perforations.

[0107] Example Ex23: An aerosol-generating device according to any of examples Exl 5 to Ex22, wherein the collar member is further selectively moveable relative to the central longitudinal axis to at least one intermediary position. [0108] Example Ex24: An aerosol-generating device according to any of examples Exl5 to Ex23, wherein the collar member is further selectively moveable relative to the central longitudinal axis to at least one intermediary position, at a position between the first position and the second position.

[0109] Example Ex25: An aerosol-generating device according to example Ex24, wherein, in the intermediary position, the collar member partially covers the plurality of perforations and, in the second position, the collar member covers the plurality of perforations.

[0110] Example Ex26: An aerosol-generating device according to example Ex24, wherein, in the intermediary position, the collar member at least partially covers a first proportion of the plurality of perforations and, in the second position, the collar member at least partially covers a different, second proportion of the plurality of perforations.

[0111] Example Ex27: An aerosol-generating device according to example Ex26, wherein, in the second position, the collar member covers both the first proportion of the plurality of perforations and the second proportion of the plurality of perforations.

[0112] Example Ex28: An aerosol-generating device according to example Ex26, wherein the first proportion of the plurality of perforations is distributed around the ventilation zone at a first axial position, and the second proportion of the plurality of perforations is distributed around the ventilation zone at a second axial position.

[0113] Example Ex29: An aerosol-generating device according to any of examples Ex26 to Ex28, wherein the first proportion of the plurality of perforations includes a number of perforations in the range from 1 to 20.

[0114] Example Ex30: An aerosol-generating device according to any of examples Ex26 to Ex29, wherein the second proportion of the plurality of perforations includes a number of perforations in the range from 1 to 20.

[0115] Example Ex31 : An aerosol-generating system including: the aerosol-generating device of any of the examples Exl to Ex30; and a rod-shaped aerosol-generating article, the aerosol-generating article having a plurality of perforations arranged circumferentially around a side wall of the aerosol-generating article.

[0116] Example Ex32: An aerosol-generating device according to any examples Exl to Exl4, wherein the aerosol-generating device is configured so that the aerosol-generating article is moveably mountable to the aerosol-generating device. [0117] Example Ex33: An aerosol-generating device according to example Ex32, wherein the aerosol-generating article is moveably mounted to be rotatable around the central longitudinal axis of the device cavity.

[0118] Example Ex34: An aerosol-generating device according example Ex32 or Ex33, wherein the collar member is fixedly mounted to the mouth end of the aerosol-generating device.

[0119] Example Ex35: An aerosol-generating device according to example Ex34, wherein the collar member is integrally formed with the peripheral wall.

[0120] Example Ex36: An aerosol-generating device according to any of examples Ex32 to Ex25, wherein the collar member includes at least one projecting portion.

[0121] Example Ex37: An aerosol-generating device according to example Ex36, wherein the at least one projecting portion is a wedge-shaped projecting portion including a base portion extending circumferentially around the collar member, and an edge portion depending from the base portion at an angle to the base portion.

[0122] Example Ex38: An aerosol-generating system including: the aerosol-generating device of any of the examples Ex32 to Ex37; and a rod-shaped aerosol-generating article, the aerosol-generating article having a plurality of perforations arranged circumferentially around a side wall of the aerosol-generating article.

[0123] Example Ex39: An aerosol-generating system including: the aerosol-generating device according to example Ex37; and an aerosol generating article having a rod-shaped form and including a plurality of perforations circumferentially arranged around a side wall; wherein the plurality of perforations are further distributed axially along the aerosolgenerating article, and wherein, in rotating the aerosol-generating article from the first position to the second position, the projecting portion at least partially covers an increasing proportion of the plurality of perforations.

[0124] Example Ex40: An aerosol-generating system including: the aerosol-generating device according to example Ex36 or Ex37; and an aerosol generating article having a rod-shaped form and including a plurality of perforations circumferentially arranged around a side wall; wherein the at least one projecting portion is a series of projecting portions arranged circumferentially around the collar member with a gap between each projecting portion. [0125] Example Ex41 : An aerosol-generating system according to example Ex39 or Ex40, wherein the aerosol-generating article is further selectively moveable relative to the central longitudinal axis to at least one intermediary position, typically at a position between the first position and the second position.

[0126] Example Ex42: An aerosol-generating system according to example Ex41, wherein, in the intermediary position, the collar member partially covers the plurality of perforations and, in the second position, the collar member covers the plurality of perforations.

[0127] Example Ex43: An aerosol-generating system according to example Ex41, wherein, in the first position, the collar member at least partially covers a first proportion of the plurality of perforations and, in the second position, the collar member covers a different, second proportion of the plurality of perforations.

[0128] Example Ex44: An aerosol-generating system according to example Ex43, wherein in the second position, the collar member covers both the first proportion and the second proportion of the plurality of perforations.

[0129] Example Ex45: An aerosol-generating system according to example Ex43 or Ex44, wherein each perforation of the first proportion of the plurality of perforations has a first cross-sectional area, wherein each perforation of the second proportion of the plurality of perforations has a second cross- sectional area, and wherein the second cross-sectional area is greater than the first cross-sectional area.

[0130] Example Ex46: An aerosol-generating device according to any of examples Exl to Ex45, wherein an inner surface of the collar member is dimensioned to be in contact with the side wall of the aerosol-generating article at an area where the plurality of perforations are provided when the aerosol-generating article is at least partially received into the device cavity.

[0131] Examples will now be described further with reference to the figures in which:

FIG. 1 shows a schematic cross-sectional view of a comparative aerosol-generating device and a comparative aerosol-generating system;

FIG. 2A shows a side view of a first example aerosol-generating system, including a collar member and an aerosol-generating article, with the collar member a first position relative to the aerosol-generating article;

FIG. 2B shows a side view of the first example aerosol-generating system of FIG. 2A with the collar member in a second position relative to the aerosol-generating article; FIG. 3A shows a side view of a second example aerosol-generating system, including a collar member and an aerosol-generating article, with the collar member in a first position relative to the aerosol-generating article;

FIG. 3B shows a side view of the second example aerosol-generating system of FIG. 3 A, with the aerosol-generating article in an intermediary position relative to the aerosol-generating article;

FIG. 3C shows a side view of the second example aerosol-generating system of FIG. 3 A, with the aerosol-generating article in a second position relative to the aerosol-generating article;

FIG. 4A shows a side view of a third example aerosol-generating system, including a collar member and an aerosol-generating article, with the collar member in a first position relative to the aerosol-generating article;

FIG. 4B shows a side view of the third example aerosol-generating system of FIG. 4A, with the aerosol-generating article in a second position relative to the aerosol-generating article;

FIG. 5 shows a side view of a fourth example aerosol-generating system, including a collar member and an aerosol-generating article, with the aerosol-generating article in a first position relative to the collar member;

FIG. 6A shows an isolated view of the side wall of the aerosol-generating article of FIG. 5;

FIG. 6B shows a plan view of the side wall of FIG. 6A demounted from the aerosolgenerating article;

FIG. 7 shows a side view of a fifth example aerosol-generating system, including a collar member and an aerosol-generating article, with the aerosol-generating article in a first position relative to the collar member;

FIG. 8A shows a plan view of a portion of the circumference of the collar member of the aerosol-generating system of FIG. 7, with the aerosol-generating article in a second position relative to the collar member;

FIG. 8B shows a plan view of a portion of the circumference of the collar member of the aerosol-generating system of FIG. 7, with the aerosol-generating article in an intermediary position relative to the collar member;

FIG. 8C shows a plan view of a portion of the side wall of the aerosol-generating article of FIG. 8A and FIG. 8B demounted from the aerosol-generating article. [0132] FIG. 1 illustrates an aerosol-generating system 100 comprising a comparative aerosolgenerating device 110 and an aerosol-generating article 120. The aerosol-generating device 110 comprises a housing 104, extending between a mouth end 102 and a distal end (not shown). The housing 104 comprises a peripheral wall 106. The peripheral wall 106 defines a device cavity for receiving an aerosol-generating article 120. An extractor 108 is located within the device cavity defined by the peripheral wall 106 and is configured to receive and extract the aerosol-generating article 120 from the device cavity. The extractor 108 comprises a body having an open, mouth end 102 and a closed end. The closed end of the extractor 108 body is defined by an end- wall. The device cavity is further defined by a closed, distal end and an open, mouth end 102. The mouth end 102 of the device cavity is located at the mouth end of the aerosol-generating device 110. The aerosol-generating article 120 is configured to be received through the mouth end 102 of the device cavity and is configured to abut either the closed end of the device cavity or a closed end of the extractor 108. The closed end of the extractor 108 is configured to substantially abut, or to be in proximity of, the closed end of the device cavity.

[0133] An air-flow path 132 is defined around the external surface of the extractor 108 and between the peripheral wall 106 of the aerosol-generating device housing 104 and an external surface of the extractor 108. Air is allowed to enter the extractor 108 via an aperture (not shown) present at the closed end of the extractor 108 body. This enables air to flow through the rod of aerosol-forming substrate 112 and further downstream through the rest of the aerosol-generating article 120 upon suction being created by user at the mouth end 102 of the article 120.

[0134] The aerosol-generating device 110 further comprises a heater (not shown) and a power source (not shown) for supplying power to the heater. A controller (not shown) is also provided to control such supply of power to the heater. The heater is configured to heat the aerosol-generating article 120 during use, when the aerosol-generating article 120 is received within the aerosolgenerating device 110.

[0135] The aerosol-generating article 120 comprises a rod of aerosol-forming substrate 112, a hollow support segment 114, a hollow tubular segment 116 and a mouthpiece segment 118. These four elements are arranged in an end-to-end, longitudinal alignment and are circumscribed by a wrapper 122 to form the aerosol-generating article 120. The aerosol-generating article 120 shown in FIG. 1 is particularly suitable for use with an electrically operated aerosol-generating device 110 including a heater for heating the rod of aerosol-forming substrate 112. [0136] The rod of aerosol-forming substrate 112 has a length of about 12 millimetres and a diameter of about 7 millimetres. The rod 112 is cylindrical in shape and has a substantially circular cross-section. The rod 112 comprises a gathered sheet of homogenised tobacco material. The hollow cellulose acetate tube (hollow support segment 114) has a length of about 8 millimetres and a thickness of 1 millimetre. The mouthpiece segment 118 comprises a plug of cellulose acetate tow of 8 denier per filament and has a length of about 7 millimetres.

[0137] The hollow tubular segment 116 is provided as a cylindrical tube having a length of about 18 millimetres and a thickness of the tube wall is about 100 micrometres.

[0138] The aerosol-generating article 120 comprises a ventilation zone 126 provided at least about 5 millimetres from an upstream end of the mouthpiece segment 118. The ventilation zone 126 is at least about 12 millimetres from the downstream end of the aerosol-generating article 120. The ventilation zone 126 is at least about 21 millimetres from a downstream end of the rod 112 . The ventilation zone 126 comprises a series or line of perforations extending through the wrapper 122.

[0139] As shown in FIG. 1, the ventilation zone 126 of the aerosol-generating article 120 is exposed during use of the aerosol-generating system 100.

[0140] In alternative aerosol-generating systems, the aerosol-generating article may include a fluid reservoir suitable for use with an electrically operated aerosol-generating device. The fluid contained in the fluid reservoir forms an aerosol when heated. The aerosol-generating system may include a heater for heating the fluid of the fluid reservoir to form an aerosol. The heater may be mounted within the aerosol-generating article of the aerosol-generating system. The aerosolgenerating article may include a wicking element or other type of fluid distribution element or device to controllably release fluid from the fluid reservoir to the heater.

[0141] Referring now to FIG. 2A and FIG. 2B, there is shown an aerosol-generating system 200 including an aerosol-generating device 210 and an aerosol-generating articles 220. In FIG. 2A, the collar member 230 is shown in a first position relative to the aerosol-generating article 220 mounted to the aerosol-generating device 210. In FIG. 2B, the collar member 230 is shown in a second position relative to the aerosol-generating article 220 mounted to the aerosol-generating device 210.

[0142] The aerosol-generating device 210 is configured to receive a rod-shaped aerosol-generating article 220, the aerosol-generating article 220 having a plurality of perforations 224 arranged in a side wall 214 of the aerosol-generating article 220. The aerosol-generating device 210 includes a housing defining a device cavity at a mouth end 202 of the aerosol-generating device 210 having a central longitudinal axis, wherein the device cavity is configured to at least partially receive the aerosol-generating article 220. The aerosol-generating device 210 also includes a collar member 230 extending axially at least partially around the central longitudinal axis from the device cavity at the mouth end 202 of the aerosol-generating device 210. The collar member 230 is selectively moveable relative to the central longitudinal axis from a first position, in which the plurality of perforations 224 are uncovered, to a second position in which at least some of the plurality of perforations 224 are covered by the collar member 230.

[0143] The device cavity of the aerosol-generating device 210 is cylindrically-shaped, in similar fashion to the device cavity defined by the peripheral wall 106 of the aerosol-generating device 110 of FIG. 1. In the present example, the device cavity has a diameter to allow axial movement of the collar member 230 in the direction of the central longitudinal axis when the aerosol-generating article 220 is at least partially received in the device cavity.

[0144] The collar member 230 includes an annular core. The collar member 230 is mounted to the aerosol-generating device 210 with the annular core arranged to be coaxial with the central longitudinal axis. The annular core is circumscribed by a body portion 242. The collar member 230 mounted to the aerosol-generating device 210 so that the body portion 242 is oriented so that the aerosol-generating article 220 is at least partially received into the device cavity along the central longitudinal axis. The collar member 230 is mounted to the device cavity to be selectively moveable along the central longitudinal axis. In this way, the collar member 230 is selectively moveable relative to the aerosol-generating article 220 at least partly received within the device cavity.

[0145] The collar member includes a locating element. The locating element is provided on the portion of the aerosol-generating article 220 received within the device cavity. The locating element is configured to mount the collar member 230 to a complementary engagement means within in the device cavity. The complementary engagement means of the locating element and device cavity provide an interference fit between the collar member 230 and the aerosol-generating device 210. Typically, the locating element mounts the collar member 230 to an engagement means provided on an inner surface of the peripheral wall 204. Any suitable locating element and engagement means may be provide so as to give a limited relative axial movement between the collar member 230 and aerosol-generating device 210. For example, the locating element may include a series of axial ribs on the collar member 230 and with the engagement means formed as a series of corresponding grooves on the inner surface of the peripheral wall 204 configured to each receive an axial rib and allow axial movement along each groove. [0146] The collar member includes a series of projecting portions 232. The projecting portion 232 are arranged to extend axially away from the peripheral wall 204 at the mouth end 202 of the aerosol-generating device 210. The projecting portions 232 are disposed circumferentially around the collar member 230 with a gap 234 between adjacent projecting portions 232. The collar member 230 thereby includes a portion in which the projecting portions 232 are arranged around the collar member 230, with gaps 234 interposed therebetween.

[0147] The collar member 230 is moveably mounted to the aerosol-generating device 210 at the mouth end 202 of the aerosol-generating device 210. The collar member 230 is slidably mounted to the aerosol-generating device 210 to move axially relative to the aerosol-generating device 210, from the first position to the second position. The first position and the second position represent limits of the axial movement of the collar member 230 relative to the aerosol-generating device 210.

[0148] The aerosol-generating device 210 includes an actuator 236 engaged with the collar member 230. In the example, the actuator 236 projects radially outwards from the body portion of the collar member 230.

[0149] The actuator 236 is arranged so that, with the collar member 230 mounted to the aerosolgenerating device 210 for use, the actuator 236 projects through an elongate slot 238 through the peripheral wall 204 of the housing. The collar member 230 is mounted to the aerosol-generating device 210 so that the actuator 236 is selectively moveable within the elongate slot 238. In this way, the collar member 230 manually operable to selectively move either from the first position to the second position.

[0150] With the aerosol-generating article 220 mounted to the aerosol-generating device 210, the aerosol-generating system 200 is ready for use.

[0151] An aerosol-generating system 200 includes the aerosol-generating article 220 with a plurality of perforations 224 arranged circumferentially around the side wall 214 of the aerosolgenerating article 220. The aerosol-generating article 220 is mounted within the device cavity by being received through the annular core of the collar member 230.

[0152] The aerosol-generating device 210 further includes a heater (not shown) for heating an aerosol-forming substrate provided in the aerosol-generating article, in a similar manner to the comparative example described with reference to FIG. 1. The heater is activated by the user pressing a button 240 mounted in the peripheral wall 204 of the aerosol-generating device 210.

[0153] Referring particularly to FIG. 2A, in the first position, the collar member 230 is retracted within the device cavity. Thus, the collar member 230 is positioned so that the body portion of the collar member 230 is located within the device cavity. The projecting portions 232 are outside the device cavity and proximal to the mouth end 202 of the aerosol-generating device 210. In the first position, each perforation 224 is uncovered.

[0154] Referring particularly to FIG. 2B, in the second position, the collar member 230 is positioned an increased axial distance from the mouth end 202 of the aerosol-generating device 210. The collar member 230 is positioned so that the body portion of the collar member 230 is substantially outside of the device cavity. The projecting portions 232 are outside the device cavity and an increased distance from the mouth end 202.

[0155] In the example shown, moving the collar member 230 from the first position to the second position, moves the collar member 230 an axial distance of 5mm. The projecting portions 232 are thereby moved 5mm axially away from the mouth end 202.

[0156] In the second position, a first proportion of the perforations 224 are covered.

[0157] In the second position, a second proportion of the perforations 224 are uncovered. The second proportion of the perforations 224 are each axially aligned with a gap 234 between projecting portions 232. Movement of the collar member 230 from the first position to the second position leaves the second proportion of perforations 226 uncovered.

[0158] Due to the size and spacing of the projecting portions 232 and the perforations 224, the first proportion and the second of the perforations 224 are each 50 percent of the perforations 224. In particular, in the second position, the projecting portions 232 and gaps each overlap an equal number of the perforations 224 on the aerosol-generating article 220. Thus the collar member 230 spans a circumference of the side wall 214 of the aerosol-generating article so that perforations 224 are alternately covered and uncovered in the second position. In this way, fluid flow into 50 percent of the perforations 224, the first proportion of the perforations 224 is prevented. The user is thus able to reliably restrict dilution of the aerosol generated in the aerosol-generating system 200 by around half. The user can selectively adjust dilution of the aerosol produced by the aerosolgenerating article during use to mitigate warm aerosol perception phenomenon.

[0159] Any suitable size of projecting portions may be provide to deliver alternative dilution levels by ensured the first proportion of perforation 224 covered by the projecting portions is selected appropriately. For example the projecting portions may be sized and oriented so that first proportion of perforation 224 covered in the second position is one quarter, one third, two thirds, three quarters or any other desirable first proportion. [0160] Referring now to FIG. 3A, FIG. 3B and FIG. 3C, there is shown another example aerosolgenerating system 300. The aerosol-generating system 300 is similar to the example described with reference to FIG. 2 A and FIG. 2B other than the collar member 330 is further selectively moveable relative to the central longitudinal axis to an intermediary position. Features that are common with the example of FIG. 2A and FIG. 2B have the same numerals other than the initial digit is a ‘3’.

[0161] In FIG. 3A, the collar member 330 is shown in a first position relative to the aerosolgenerating article 320 mounted to the aerosol-generating device 310. In FIG. 3B, the collar member 330 is shown in an intermediary position relative to the aerosol-generating article 320 mounted to the aerosol-generating device 310. In FIG. 3C the collar member 330 is shown in a second position relative to the aerosol-generating article 320 mounted to the aerosol-generating device 310.

[0162] The collar member 330 is moveable relative to the aerosol-generating device 310 along the central longitudinal axis to an intermediary position between the first position and the second position. The intermediary position is an axial position of the collar member 330, relative to the aerosol-generating device 310 that is between the first position of the collar member 330 and the second position of the collar member 330.

[0163] The first position and the second position represent limits of the axial movement of the collar member 330 relative to the aerosol-generating device 310. The intermediary position is an axial position of the collar member 330 that is between the limits of the axial movement of the collar member 330 relative to the aerosol-generating device 310.

[0164] The collar member 330 is slidably mounted to the aerosol-generating device 310 to move axially from the first position to the intermediary position and, subsequently, to the second position.

[0165] With the aerosol-generating article 320 mounted to the aerosol-generating device 310, the aerosol-generating system 300 is ready for use.

[0166] The aerosol-generating article 320 includes a plurality of perforations 324 arranged circumferentially around the side wall 314 of the aerosol-generating article 320. The aerosolgenerating article 320 is mounted within the device cavity by being received through the annular core of the collar member 330.

[0167] Referring particularly to FIG. 3 A, in the first position, the collar member 330 is retracted within the device cavity. Thus, the collar member 330 is positioned to that a body portion 342 of the collar member 330 is located within the device cavity. The projecting portions 332 are outside the device cavity and proximal to the mouth end 302 of the aerosol-generating device 310. In the first position, each perforation 324 is uncovered. [0168] Referring particularly to FIG. 3B, in the intermediary position, the collar member 330 is partially retracted within the device cavity. Thus, the collar member 330 is positioned to that a body portion 342 of the collar member 330 is located partially within the device cavity. The projecting portions 332 are outside the device cavity and an axial distance from the mouth end 302 of the aerosol-generating device 310. The collar member 330 partially covers the plurality of perforation 324. Each perforation 324 is partially covered. That is, each projecting portion 332 of the collar member 330 partially covers a respective perforation 324 on the side wall 314. In this way, fluid flow into each perforation 324 is reduced. The user is thus able to reliably restrict dilution of the aerosol generated in the aerosol-generating system 300 to a first dilution level.

[0169] Referring particularly to FIG. 3C, in the second position, the collar member 330 is positioned an increased axial distance from the mouth end 302 of the aerosol-generating device 310. The collar member 330 is positioned so that the body portion 342 of the collar member 330 is substantially outside of the device cavity and the projecting portions 332 are outside the device cavity and an increased distance from the mouth end 302. In the second position, each perforation 324 is covered. In this way, fluid flow into each perforation 324 is blocked. The user is thus able to reliably disable dilution of the aerosol generated in the aerosol-generating system 300.

[0170] In the example shown, moving the collar member 330 from the first position to the intermediary position moves the collar member 330 an axial distance of 3mm. In moving the collar member 330 from the intermediary position to the second position the collar member 330 moves a further axial distance of 3mm. The projecting portions 332 are thereby moved axially a total of 6mm away from the mouth end 302.

[0171] Referring now to FIG. 4A and FIG. 4B, another example aerosol-generating system 400. The aerosol-generating system 400 is similar to the example described with reference to FIG. 2A and FIG. 2B other than the collar member 430 is further selectively moveable relative to the central longitudinal axis of the device cavity to an intermediary position. Features that are common with the example of FIG. 2A and FIG. 2B have the same numerals other than the initial digit is a ‘4’.

[0172] The collar member 430 includes a body portion 442 and a cover portion 434. The body portion 442 is axially spaced from the cover portion 434. With the collar member 430 mounted to the aerosol-generating device 410, the collar member 430 is oriented with the body portion 442 to be received within the device cavity. The cover portion 434 is oriented towards the mouthpiece segment 416 of the aerosol-generating article 420 that is received into the device cavity. The cover portion 434 is substantially annular, forming an annular end of the collar member 430. [0173] In FIG. 4A, the collar member 430 is shown in a first position relative to the aerosolgenerating article 420 mounted to the aerosol-generating device 410. In FIG. 4B, the collar member 430 is shown in an intermediary position relative to the aerosol-generating article 420 mounted to the aerosol-generating device 410. The collar member 430 is also moveable to a second position relative to the aerosol-generating article 420 mounted to the aerosol-generating device 410.

[0174] The collar member 430 is moveable relative to the aerosol-generating device 410 along the central longitudinal axis to an intermediary position between the first position and the second position. The intermediary position is an axial position of the collar member 430, relative to the aerosol-generating device 410 that is between the first position of the collar member 430 and the second position of the collar member 430.

[0175] The first position and the second position represent limits of the axial movement of the collar member 430 relative to the aerosol-generating device 410. The intermediary position is an axial position of the collar member 430 that is between the limits of the axial movement of the collar member 430 relative to the aerosol-generating device 410.

[0176] The aerosol-generating system 400 includes the aerosol-generating article 420 with a ventilation zone 422. The ventilation zone 422 includes a plurality of perforations 424a, 424b arranged circumferentially around the side wall 414 of the aerosol-generating article 420.

[0177] The ventilation zone 422 includes a first proportion of perforations 424a and a second proportion of perforations 424b. The first proportion of perforations 424a is distributed around the ventilation zone 422 at a first axial position along the side wall 414. The second proportion of perforations 424b is distributed around the ventilation zone 422 at a second axial position along the side wall 414. The second proportion of perforations 424b is positioned axially between the mouthpiece segment 416 and the first proportion of perforations perforation 424a.

[0178] The aerosol-generating article 420 is mounted within the device cavity by being received through the annular core of the collar member 430. The collar member 430 is slidably mounted to the aerosol-generating device 410 to move axially from the first position to the intermediary position and, subsequently, to the second position.

[0179] With the aerosol-generating article 420 mounted to the aerosol-generating device 410, the aerosol-generating system 400 is ready for use.

[0180] Referring particularly to FIG. 4A, in the first position, the collar member 430 is retracted towards the device cavity. The collar member 430 is positioned to that a body portion 442 of the collar member 430 is substantially located within the device cavity. The cover portion 434 is located outside the device cavity and proximal to the mouth end 402 of the aerosol-generating device 410. In the first position, the ventilation zone 422 is uncovered. That is, in the first position, the first proportion of perforation 424a are uncovered and the second proportion of perforations 424b are uncovered.

[0181] Referring particularly to FIG. 4B, in the intermediary position, the collar member 430 is partially retracted within the device cavity. Thus, the collar member 430 is positioned to that the body portion 442 of the collar member 430 is located partially within the device cavity. The collar member 430 is positioned an increased axial distance from the mouth end 402 of the aerosolgenerating device 410. The collar member 430 covers the first proportion of perforation 424a. The user is thus able to reliably restrict dilution of the aerosol generated in the aerosol-generating system 400 to a first dilution level.

[0182] In the second position (not shown), a second proportion of the perforations 424b are also covered. The first proportion of perforations 424a and the second proportion of the perforations 424b are both covered by the cover portion 434 of the collar member 430. In this way, fluid flow into each perforation 424a, 424b is blocked. The user is thus able to reliably disable dilution of the aerosol generated in the aerosol-generating system 400.

[0183] In the example shown, moving the collar member 430 from the first position to the intermediary position moves the collar member 430 an axial distance of 3 mm. In moving the collar member 430 from the intermediary position to the second position the collar member 430 moves a further axial distance of 3mm. The cover portions is thereby moved axially a total of 6mm away from the mouth end 402 of the aerosol-generating device 410.

[0184] Due to the size and axial spacing of the first proportion of perforations 424a and the second proportion of perforations 424b, the first proportion and the second of the perforations 224 are each 50 percent of the perforations 224. In particular, the first proportion of perforations 424a provide 50 percent of the effective area of the ventilation zone 422 and the second proportion of perforations 424b provide 50 percent of the effective area of the ventilation zone 422. In this way, in the intermediary position, fluid flow is prevented into 50 percent of the perforations 424a. The user is thus able to reliably restrict dilution of the aerosol generated in the aerosol-generating system 200 by half. The user can selectively adjust dilution of the aerosol produced by the aerosol-generating article during use to mitigate warm aerosol perception phenomenon.

[0185] Any suitable size of projecting portions may be provide to deliver alternative dilution levels by ensured the first proportion of perforation 224 covered by the projecting portions is selected appropriately. For example the projecting portions may be sized and oriented so that the effective area of the first proportion of perforations 424a is one quarter, one third, two thirds, three quarters or any other desirable proportion.

[0186] In alternative arrangements, the collar member 430 may be moveable to a first intermediary position and a second intermediary position. The ventilation zone 422 of the aerosol-generating article 420 may include a first proportion, second proportion and third proportion of perforations. The first proportion, second proportion and third proportion of perforations are each distributed at a different axial position along the aerosol-generating article. In the first position all the perforations in the ventilation zone 422 are uncovered. In the first intermediary position, the collar member at covers a first proportion of the plurality of perforations. In the second intermediary position, the collar member covers the first proportion and second proportion of perforations. In the second position the collar member covers all of the perforations in the ventilation zone. The user is thus able to selectively adjust dilution of the aerosol to range of dilutions.

[0187] Referring now to FIG. 5, there is shown an example aerosol-generating system 500 in which the aerosol-generating article is moveable. The aerosol-generating system 500 is similar to the example described with reference to FIG. 2A and FIG. 2B other than the aerosol-generating article 520 is selectively moveable relative to the central longitudinal axis of the device cavity to an intermediary position. Features that are common with the example of FIG. 2A and FIG. 2B have the same numerals other than the initial digit is a ‘5’.

[0188] The aerosol-generating device 510 is configured to receive a rod-shaped aerosol-generating article 520 which includes a plurality of perforations 524 arranged in a side wall 514 of the aerosolgenerating article 520. The aerosol-generating device 510 a housing defining a device cavity 508 at a mouth end 502 of the aerosol-generating device 510 having a central longitudinal axis. The device cavities 508 is configured to partially receive the aerosol-generating article 520.

[0189] A collar member 530 extends axially from the device cavity and extends around the central longitudinal axis at the mouth end 502 of the aerosol-generating device 510. The received aerosolgenerating article 520 is selectively moveable relative to the central longitudinal axis from a first position, in which the plurality of perforation 524 are uncovered, to a second position in which the plurality of perforation 524 are covered by the collar member 530. The aerosol-generating article 520 is rotatable around the central longitudinal axis of the device cavity 508. [0190] The collar member 530 includes a projecting portion 534 arranged to extend axially away from the peripheral wall 504 at the mouth end 502 of the aerosol-generating device 510. The collar member 530 and the projecting portion 534 are is integrally formed with the peripheral wall 504.

[0191] The collar member is fixedly mounted to the mouth end of the aerosol-generating device. The collar member 530 remains static relative to the peripheral wall 504 as the aerosol-generating article 520 is rotated around the central longitudinal axis.

[0192] The projecting portion 534 is a wedge-shaped projecting portion. The projecting portion 534 has a cut-out portion extending circumferentially around the collar member, and an edge portion 536 depending from the cut-out portion at an angle to the base portion. In the example, the edge portion 536 is oriented to give a helical edge portion.

[0193] Referring additionally to FIG. 6A, there is shown a side view of the side wall 514 of the aerosol-generating article 520 of the example. The aerosol-generating article 520 includes series of perforations 524 arranged circumferentially around the side wall 514. Each series of perforations 524 includes three perforations 524.

[0194] Referring additionally to FIG. 6B, there is shown a plan view of the side wall 514 demounted from the aerosol-generating article 520 of the example. In the example, the side wall 514 is a paper wrapper which is demounted from the aerosol-generating article 520 and laid flat. It will be apparent however, that the arrangement of perforations 524 shown by the plan view may equally be provided on side walls of any suitable material as described herein.

[0195] As shown in FIG. 6B, each series 528 of perforations 524 is spaced apart from an adjacent series. In this way, each series of perforations 524 is spaced apart circumferentially from an adjacent series when the side wall 514 is mounted to the aerosol-generating article 520.

[0196] The aerosol-generating article 520 is moveable relative to the aerosol-generating device 510 by rotating around the central longitudinal axis. The aerosol-generating article 520 is moveable to a first intermediary position and a second intermediary position between the first position and the second position. Each intermediary position is a rotational position of the aerosol-generating article 520, relative to the aerosol-generating device 510, that is between the first position of the aerosolgenerating article 520 and the second position of the aerosol-generating article 520.

[0197] The aerosol-generating article 520 is free to rotate entirely around the central longitudinal axis. The aerosol-generating article 520 may be positioned relative to the aerosol-generating device 510 so that the collar member 530 covers all but one of the series of perforations 524. [0198] The spacing of the series of perforations 524 corresponds to the width of the cut-out portion. One series of perforations 524 may be uncovered, or partly uncovered, by the provision of the cut-out portion of the collar member 530. One series of perforations 524 may be revealed, or partly revealed, by the provision of the cut-out portion of the collar member 530. In this way, regardless of the general rotational orientation of the aerosol-generating article 520 within the aerosol-generating device 510, the aerosol-generating article 520 is incrementally moveable between a first position, a first intermediary position, a second intermediary position and a second position.

[0199] The aerosol-generating article 520 includes an indicator 526 on the side wall 514. The indicator 526 is configured to be covered by a tip of the edge portion 536 as the aerosol-generating article 520 rotates within the device cavity 508. In this way, the indicator 526 provides a user with a visual guide as to the dilution corresponding to the rotational position of the aerosol-generating article 520.

[0200] In certain examples, other visual guides may be provided on one or more of the aerosolgenerating article and the collar member. In an example, the indicator, or a portion of the indicator may be aligned with the edge portion as the aerosol-generating article rotates within the device cavity. In an example, the indicator, or a portion of the indicator may be aligned with a registration mark provided on the collar portion or provided on the peripheral wall at the mouth end of the aerosol-generating device.

[0201] With the aerosol-generating article 520 mounted to the aerosol-generating device 510, the aerosol-generating system 500 is ready for use.

[0202] In the first position, the aerosol-generating article 520 is rotated within the device cavity 508 so that each perforation of a series of perforations 524 is located within the cut-out portion of the collar member 530. In the first position, each perforation 524 is uncovered. Fluid flow through the ventilation zone 522 is at a maximal flow rate.

[0203] By rotating the aerosol-generating article 520 to the first intermediary position, a first perforation of the series of perforations 524 is covered by the collar member 530. The remaining two perforations 524 are located within the cut-out portion of the collar member 530. In this way, fluid flow through the ventilation zone 522 is partly reduced.

[0204] By rotating the aerosol-generating article 520 to the second intermediary position, a first and second perforation of the series of perforations 524 is covered by the collar member 530. The remaining perforation 524 is located within the cut-out portion of the collar member 530. In this way, fluid flow through the ventilation zone 522 is further reduced. [0205] In the second position, the aerosol-generating article 520 is rotated within the device cavity 508 so that each perforation of a series of perforations 524 is covered by the collar member 530. In this way, fluid flow into each perforation 524 of the series is blocked.

[0206] The user is thus able to incrementally adjust dilution of the aerosol generated in the aerosol-generating system 300.

[0207] Referring now to FIG. 7, there is shown another example aerosol-generating system 700 in which aerosol-generating article 720 is moveable. The aerosol-generating system 700 is similar to the example described with reference to FIG. 5 to FIG. 6B, other than the collar member 730 includes a plurality of projecting portions 734. Features that are common with the example of FIG. 5 to FIG. 6B have the same numerals other than the initial digit is a ‘7’.

[0208] A collar member 730 extends axially from the device cavity and extends around the central longitudinal axis at the mouth end 702 of the aerosol-generating device 710. The aerosol-generating article 720 is rotatable around the central longitudinal axis of the device cavity. The received aerosol-generating article 720 is selectively moveable relative to the central longitudinal axis from a first position, in which a first series of perforations 718 are uncovered by the collar member 730, to a second position in which a different, second series of perforations 728 are uncovered by the collar member 730. The first series of perforations 718 may be regarded as a first proportion of perforations and the second series of perforations 728 may be regarded as a second proportion of perforations.

[0209] The aerosol-generating article 720 is free to rotate entirely around the central longitudinal axis. The collar member 730 selectively covers either the first series of perforations 718 or the second series of perforations 728. Regardless of the general rotational orientation of the aerosolgenerating article 720 relative to the collar member 730, the aerosol-generating article 720 is rotatable between a first position and a second position.

[0210] The collar member 730 includes a series of projecting portions 734 arranged to project axially away from the peripheral wall 704 at the mouth end 702 of the aerosol-generating device 710. The collar member 730 and each projecting portion of the series of projecting portions 734 are is integrally formed with the peripheral wall 704.

[0211] The collar member 730 is fixedly mounted to the mouth end 702 of the aerosol-generating device 710. The collar member 730 remains static relative to the peripheral wall 704 as the aerosolgenerating article 720 is rotated around the central longitudinal axis. [0212] The collar member 730 includes a body portion 742 and the series of projecting portions 734 extending from the body portion 742. The projecting portions 734 form a crenellated end portion of the collar member 730.

[0213] Referring additionally to FIG. 8C, there is shown a plan view of the side wall 714 demounted from the aerosol-generating article 720 of the example of FIG. 7. In the example, the side wall 714 is a paper wrapper which is demounted from the aerosol-generating article 720 and laid flat. It will be apparent however, that the arrangement of perforations shown by the plan view may equally be provided on side walls of any suitable material as described herein.

[0214] As shown in FIG. 8C, the first series of perforations 718 is interdigitated with the second series of perforations 728. Each perforation of the first series of perforations 718 has a first cross- sectional area. Each perforation of the second series of perforations 728 has a second cross-sectional area. The first cross-sectional area is greater that the second cross-sectional area, for example two times greater. In this way, the total first cross-sectional area may be twice the second cross-sectional area.

[0215] With the aerosol-generating article 720 mounted to the aerosol-generating device 710, the aerosol-generating system 700 is ready for use.

[0216] Referring additionally to FIG. 8A, there is shown a circumferential schematic of the collar member 730 in the first position. In the first position, the aerosol-generating article 720 is rotated within the device cavity so that each perforation of the first series of perforations 718 is uncovered. Each perforation of the second series of perforations 728 is covered by a respective projecting portion 734. Each perforation of the second series of perforations 728 is blocked so fluid flows only through the first series of perforations 718. Fluid flow through the ventilation zone 722 is at a first flow rate.

[0217] Referring additionally to FIG. 8B, there is shown a circumferential schematic of the collar member 730 in the second position. In the second position, the aerosol-generating article 720 is rotated within the device cavity so that each perforation of the first series of perforations 718 is uncovered. Each perforation of the first series of perforations 718 is covered by a respective projecting portion 734. Each perforation of the first series of perforations 718 is blocked so fluid flows only through the second series of perforations 728. Fluid flow through the ventilation zone 722 is at a second flow rate. Due to the relative cross-sectional areas, the first flow rate is nominally twice the second flow rate. [0218] The user is thus able to selectively adjust dilution of the aerosol generated in the aerosolgenerating system 700.

[0219] It will be appreciated by persons skilled in the art that the above detailed examples have been described by way of example only and not in any limitative sense, and that various alterations and modifications are possible without departing from the scope of the invention as defined by the appended claims. Various modifications to the detailed examples described above are possible.

[0220] For the purpose of the present description and of the appended claims, except where otherwise indicated, all numbers expressing amounts, quantities, percentages, and so forth, are to be understood as being modified in all instances by the term "about". Also, all ranges include the maximum and minimum points disclosed and include any intermediate ranges therein, which may or may not be specifically enumerated herein. Within this context, a number A may be considered to include numerical values that are within general standard error for the measurement of the property that the number A modifies. Also, all ranges include the maximum and minimum points disclosed and include any intermediate ranges therein, which may or may not be specifically enumerated herein.

Claims

1. An aerosol-generating device configured to receive a rod-shaped aerosol-generating article, the aerosol-generating article having a plurality of perforations arranged in a side wall of the aerosolgenerating article, the aerosol-generating device comprising: a housing defining a device cavity at a mouth end of the aerosol-generating device having a central longitudinal axis, wherein the device cavity is configured to at least partially receive the aerosol-generating article; a moveable collar member extending axially at least partially around the central longitudinal axis from the device cavity at the mouth end of the aerosol-generating device; and an actuator engaged with the moveable collar member; wherein the collar member is selectively moveable relative to the central longitudinal axis from a first position, in which the plurality of perforations are uncovered, to a second position in which at least some of the plurality of perforations are covered by the collar member.

2. An aerosol-generating device according to claim 1 , wherein the aerosol-generating device is arranged to be manually operable to selectively move the collar member from the first position to the second position.

3. An aerosol-generating device according to claim 1 or claim 2, wherein the collar member comprises an actuator projecting radially outwards from the collar member, and wherein the actuator is arranged to project through an elongate slot through a peripheral wall of the housing.

4. An aerosol-generating device according to any of claims 1 to 3, wherein collar member comprises an annular core, and wherein the collar member is mounted to the aerosol-generating device with the annular core arranged to be coaxial with the central longitudinal axis.

5. An aerosol-generating device according to any of claims 1 to 4, wherein the collar member includes at least one projecting portion arranged to extend axially away from the peripheral wall at the mouth end of the aerosol-generating device.

6. An aerosol-generating device according to claim 5, wherein the at least one projecting portion is a series of projecting portions arranged circumferentially around the collar member with a gap between each projecting portion.

7. An aerosol-generating device according to any of claims 1 to 6, wherein the collar member is moveably mounted to the aerosol-generating device, typically at the mouth end of the aerosolgenerating device.

8. An aerosol-generating device according to claim 7, wherein the collar member comprises a series of projecting portions arranged circumferentially around the collar member, wherein each projecting portion extends sufficiently to span a circumferential distance on the side wall of an aerosolgenerating article to cover both a first perforation and a region of the side wall extending from the first perforation to at least one of its adjacent perforations.

9. An aerosol-generating device according to claim 7 or claim 8, wherein the collar member is further selectively moveable relative to the central longitudinal axis to at least one intermediary position.

10. An aerosol-generating device according to claim 9, wherein, in the intermediary position, the collar member at least partially covers a first proportion of the plurality of perforations and, in the second position, the collar member at least partially covers a different, second proportion of the plurality of perforations.

11. An aerosol-generating device according to any of claims 1 to 10, further including an electromechanical means operably engaged with the collar member to selectively move either the collar member from the first position to the second position.

12. An aerosol-generating device according to any of claims 1 to 11, wherein the collar member includes a locating element configured to mount the collar member to a complementary engagement means within the device cavity.

13. An aerosol-generating device according to any of claims 1 to 12, wherein the collar member is slidably mounted to the aerosol-generating device to move axially from the first position to the second position.

14. An aerosol-generating device according to any of claims 1 to 13, wherein the aerosol-generating device is configured so that, in the first position, the collar member is retracted within the device cavity and, in the second position, the collar member extends an axial distance from the mouth end of the aerosol-generating device.

15. An aerosol-generating system comprising: the aerosol-generating device of any of claims 1 to 14; and a rod-shaped aerosol-generating article, the aerosol-generating article having a plurality of perforations arranged circumferentially around a side wall of the aerosol-generating article.