RU2851108C2 - Test product for use in an aerosol generating device - Google Patents

Abstract

FIELD: test product.

SUBSTANCE: invention relates to a test product for insertion into the heating chamber of an aerosol generating device. The test product comprises an elongated main body designed to be placed inside the heating chamber of an aerosol generating device. The test article contains a heatable substrate designed to be placed inside the elongated main part. The heatable substrate is designed to be heated when the test article is placed inside the heating chamber of the aerosol generating device. The heatable substrate is a substrate that does not generate aerosol. In other words, the heated substrate is not a heated substrate that can be designed to generate an aerosol that is suitable for consumption by a consumer. A test system containing the test article and the aerosol generating device, and a method for testing the aerosol generating device using the test article are also provided.

EFFECT: method for testing an aerosol generating device using a test article is provided.

15 cl, 12 dwg

Description

The present invention relates to a test article for insertion into a heating chamber of an aerosol-generating device (for generating an aerosol) or a heating device. The present invention further relates to a test system comprising the test article and the aerosol-generating device, and a method for testing the aerosol-generating device using the test article.

Aerosol-generating devices that heat a heated substrate to produce an aerosol without burning the heated substrate are known in the art. The heated substrate is typically provided with a test article along with other components, such as filters. The test article may be in the form of a rod for inserting the test article into the heating chamber of the aerosol-generating device. A heating element is typically located in or around the heating chamber to heat the heated substrate after the test article is inserted into the heating chamber of the aerosol-generating device. During use of the test article, volatile compounds are released from the heated substrate via heat transfer from the heat source and are entrained in air drawn through the test article. As the released compounds cool, they condense to form an aerosol.

The heating chamber may be located within the housing of the aerosol-generating device and form part of the airflow passageway through the aerosol-generating device. Testing the heating efficiency of an aerosol-generating device may require heating various articles adapted for use with the device. It is known that an aerosol-generating device may be required to withstand a relatively high number of successive heating cycles, particularly if the device's power supply is consumed and recharged during each heating cycle. Using original aerosol-generating articles containing aerosol-generating substrates, such as tobacco material, can be quite expensive and time-consuming, as performing such testing would require regular replacement of the articles during the testing period. This may be particularly appropriate when performing long-term life-cycle performance testing of the power supply or heating element of an aerosol-generating device. Life-cycle performance testing of an aerosol-generating device may involve activation and deactivation of the aerosol-generating device and its heating element for more than 10,000 heating cycles. During each heating cycle, the aerosol-generating device may need to be replaced, consumed, and discarded multiple times.

Accordingly, it would be desirable to provide a test fixture for an aerosol generating device or a heating device that reduces test costs and test duration.

According to the present invention, a test article can be provided for insertion into a heating chamber configured to accommodate aerosol-generating articles. The test article can comprise an elongated base configured to be positioned within the heating chamber. The test article can comprise a heatable substrate configured to be positioned within the elongated base. The heatable substrate can be configured to heat upon placement of the test article within the heating chamber. The heatable substrate can be a non-aerosol-generating substrate. In other words, the heatable substrate need not be a heatable substrate that can be configured to generate an aerosol suitable for consumption or inhalation by a consumer.

The heating chamber may be the heating chamber of an aerosol-generating device. However, one skilled in the art will recognize that any heating or testing device with a heating chamber capable of heating an aerosol-generating article may be suitable.

According to the present invention, a test article is provided for insertion into the heating chamber of an aerosol-generating device. The test article comprises an elongated base portion configured to be positioned within the heating chamber of the aerosol-generating device. The test article comprises a heatable substrate configured to be positioned within the elongated base portion. The heatable substrate is configured to heat upon placement of the test article within the heating chamber of the aerosol-generating device. The heatable substrate is a non-aerosol-generating substrate. In other words, the heatable substrate is not a heatable substrate that can be configured to generate an aerosol suitable for consumption or inhalation by a consumer.

The present invention provides a testing system comprising a test article according to the present invention and a heating device comprising a heating chamber for housing aerosol-generating articles. The heating device may comprise a heating chamber and a heating element for heating the article located within the heating chamber. Preferably, the heating element is designed to externally heat the article located within the heating chamber. Preferably, the heating element is an induction heating element. Preferably, the heating device is an aerosol-generating device.

By providing a test article adapted for use in an aerosol-generating device that contains a heated substrate that is not an aerosol-generating substrate, the test article can be used and heated within the aerosol-generating device multiple times. This advantageously makes such an article suitable for testing, thereby eliminating the need for constant removal and replacement of the article and reducing testing costs and operating time compared to testing using original heated test articles.

A heated substrate is a non-aerosol-generating substrate. A non-aerosol-generating substrate is considered a substrate that is not capable of generating an aerosol suitable for consumption or inhalation by a consumer. For example, a heated substrate may not contain plant material. A heated substrate may not contain tobacco material. A heated substrate may not contain an aerosol-forming substance, such as glycerin.

Preferably, the heated substrate comprises a fibrous material. Preferably, the fibrous material is substantially heat-resistant. The heated substrate may comprise synthetic fibers. Preferably, the synthetic fibers are substantially heat-resistant. The heated substrate may comprise carbon fibers, carbon fabric, carbon bundle, carbon thread, or carbon fibrous mass. The heated substrate may comprise aramid fibers, aramid fabric, aramid bundle, aramid thread, or aramid fibrous mass. The heated substrate may comprise para-aramid fibers, para-aramid fabric, para-aramid bundle, para-aramid thread, or para-aramid fibrous mass. The heated substrate may comprise Kevlar fibers, Kevlar fabric, Kevlar bundle, Kevlar thread, or Kevlar fibrous mass. Kevlar ^™ may be commercially available from DuPont de Nemours, Inc.

The heated substrate may comprise a mixture of any of the materials mentioned above. In particular, the heated substrate may comprise a mixture of carbon fibers, fabric, thread, bundle, or fibrous mass and aramid fibers, fabric, thread, bundle, or fibrous mass. The heated substrate may comprise a mixture of carbon fibers, bundle, or fibrous mass and Kevlar fibers, bundle, or fibrous mass. Preferably, the heated substrate is breathable, thus allowing air to flow through the heated substrate if air is to be drawn through the test article. The inventors of the present invention have discovered that such materials, such as carbon or aramid, provide a non-aerosol-generating heated substrate that is reusable and durable, while simulating the draw resistance and energy absorption characteristics of a heated substrate, such as a tobacco-based substrate.

The aerosol-generating device or heating device of the testing system may have a distal end and a mouthpiece (proximal) end. The aerosol-generating device or heating device may comprise a main body. The main body or housing of the aerosol-generating device or heating device may form a cavity for removably housing the test article at the mouthpiece end of the device. The aerosol-generating device or heating device may comprise a heating element or heater for heating the heated substrate when the test article is positioned within the cavity of the device.

In use, the test article may be partially inserted into the cavity of the device or the heating chamber of the corresponding aerosol-generating device (or heating device). To heat the heated substrate, the heated substrate is substantially aligned with one or more electrical heating elements of the aerosol-generating device when the test article is fully inserted into the cavity. It should be understood that the term "fully inserted" describes the position of the test article within the cavity of the aerosol-generating device when it is in the intended heating position. This does not require the entire length of the test article to be within the cavity. A portion of the test article (e.g., the mouthpiece end) may protrude from the cavity when the test article is fully inserted into the cavity.

In the context of this document, the term "length" means the dimension of a component of a test article or heating device (or aerosol generating device) in the longitudinal direction from the furthest upstream or distal point of the component to the furthest downstream or proximal point of the component.

For the purposes of this document, the term "longitudinal" refers to the direction corresponding to the major longitudinal axis of the test article or aerosol-generating device, which extends between the upstream and downstream ends of the test article or aerosol-generating device. For the purposes of this document, the terms "upstream" and "downstream" describe the relative positions of elements or portions of elements of the test article or aerosol-generating device with respect to the direction in which air may be drawn through the test article or aerosol-generating device during use. During testing, air may be drawn through the test article in the longitudinal direction.

The cavity of the device may be referred to as the heating chamber of the aerosol-generating device. The cavity may extend between the distal end and the mouthpiece, or proximal, end. The distal end of the cavity may be the closed end, and the mouthpiece, or proximal, end of the cavity may be the open end. The test article may be inserted into the cavity of the device or the heating chamber through the open end of the cavity. The cavity of the device may be cylindrical in shape to match the shape of the test article.

The term "contained within" may refer to the fact that a component or element is fully or partially contained within another component or element. For example, the term "a test article is contained within a device cavity" refers to the test article being fully or partially contained within the device cavity of the test article. When a test article is contained within a device cavity, the test article may be adjacent to the distal end of the device cavity. When a test article is contained within a device cavity, the test article may be substantially adjacent to the distal end of the device cavity. The distal end of the device cavity may be defined by an end wall.

The length of the device cavity may range from approximately 10 mm to approximately 50 mm. The length of the device cavity may range from approximately 20 mm to approximately 40 mm. The length of the device cavity may range from approximately 25 mm to approximately 30 mm.

The cavity diameter of the device may be from approximately 4 mm to approximately 10 mm. The cavity diameter of the device may be from approximately 5 mm to approximately 9 mm. The cavity diameter of the device may be from approximately 6 mm to approximately 8 mm. The cavity diameter of the device may be from approximately 7 mm to approximately 8 mm. The cavity diameter of the device may be from approximately 7 mm to approximately 7.5 mm.

The diameter of the device cavity may be substantially the same as or larger than the diameter of the test article. The diameter of the device cavity may be the same as the diameter of the test article to form a tight fit with the test article.

The cavity of the device may be configured to form a tight fit with a test article positioned within the cavity. The tight fit may be a sliding fit, a press fit, or an interference fit. The aerosol-generating device may comprise a peripheral wall. This peripheral wall may define the cavity of the device or a heating chamber. The peripheral wall, defining the cavity of the device, may be configured to engage the test article positioned within the cavity of the device via a tight fit such that there is substantially no gap or void between the peripheral wall forming the cavity of the device and the test article when positioned within the device.

Such a tight fit may form an airtight fit or configuration between the cavity of the device and the test article placed therein.

With such an airtight configuration, there will be essentially no gap or empty space between the peripheral wall forming the cavity of the device and the test article for air to flow through.

A tight fit with the test article may be formed along the entire length of the device cavity or along a portion of the length of the device cavity.

An aerosol-generating device may comprise an airflow channel extending between the channel's inlet and outlet. The airflow channel may be configured to create fluid communication between the interior of the device's cavity and the exterior of the aerosol-generating device. The airflow channel of the aerosol-generating device may be defined within the housing of the aerosol-generating device to provide fluid communication between the interior of the device's cavity and the exterior of the aerosol-generating device. When the test article is positioned within the device's cavity, the airflow channel may be configured to provide airflow into the article.

The airflow path of the aerosol-generating device may be defined within the peripheral wall of the aerosol-generating device's housing or by this peripheral wall. In other words, the airflow path of the aerosol-generating device may be defined within the thickness of the peripheral wall, by the inner surface of the peripheral wall, or by a combination of both. The airflow path may be partially defined by the inner surface of the peripheral wall or partially defined within the thickness of the peripheral wall. The inner surface of the peripheral wall defines the peripheral boundary of the device cavity.

The airflow channel of the aerosol-generating device may extend from an inlet located at the mouthpiece end or proximal end of the aerosol-generating device to an outlet located away from the mouthpiece end of the device. The airflow channel may extend along a direction parallel to the longitudinal axis of the aerosol-generating device.

The heater may be any suitable type. Preferably, the heater is an external heater.

Preferably, the heater can externally heat the test article when placed within the aerosol-generating device. Such an external heater can surround the test article when inserted into or positioned within the aerosol-generating device.

In some embodiments, the heater is configured to externally heat the heated substrate. In some embodiments, the heater is configured to be inserted into the heated substrate when the heated substrate is positioned within the cavity. The heater may be located within the cavity of the device, or a heating chamber.

The heater may comprise at least one heating element. The at least one heating element may be a heating element of any suitable type. In some embodiments, the device comprises only one heating element. In some embodiments, the device comprises multiple heating elements. The heater may comprise at least one resistive heating element. Preferably, the heater comprises multiple resistive heating elements. Preferably, the resistive heating elements are electrically connected in a parallel arrangement. Advantageously, providing multiple resistive heating elements electrically connected in a parallel arrangement can facilitate the delivery of the desired electrical power to the heater, while reducing or minimizing the voltage required to provide the desired electrical power. Advantageously, reducing or minimizing the voltage required to operate the heater can contribute to reducing or minimizing the physical size of the power supply.

Suitable materials for forming at least one resistive heating element include, but are not limited to, semiconductors such as doped ceramics, electrically conductive ceramics (such as, for example, molybdenum disilicide), carbon, graphite, metals, metal alloys, and composite materials made of a ceramic material and a metallic material. Such composite materials may comprise doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbides. Examples of suitable metals include titanium, zirconium, tantalum, and platinum group metals. Examples of suitable metal alloys include stainless steel, nickel-, cobalt-, chromium-, aluminum-, titanium-, zirconium-, hafnium-, niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese-, and iron-based alloys, as well as nickel-, iron-, cobalt-, stainless steel-, Timetal®-, and iron-manganese-aluminum-based superalloys.

In some embodiments, at least one resistive heating element comprises one or more stamped portions of an electrically resistive material, such as stainless steel. Alternatively, at least one resistive heating element may comprise a heating wire or filament, such as a Ni-Cr (nickel-chromium), platinum, tungsten, or alloy wire.

In some embodiments, at least one heating element comprises an electrically insulating substrate, wherein at least one resistive heating element is provided on the electrically insulating substrate.

The electrically insulating substrate may comprise any suitable material. For example, the electrically insulating substrate may comprise one or more of paper, glass, ceramic, anodized metal, coated metal, and polyimide. Ceramic may comprise mica, aluminum oxide (Al2O3), or zirconium dioxide (ZrO2). Preferably, the electrically insulating substrate has a thermal conductivity of less than or equal to approximately 40 watts per meter-Kelvin, preferably less than or equal to approximately 20 watts per meter-Kelvin, and ideally less than or equal to approximately 2 watts per meter-Kelvin.

The heater may comprise a heating element comprising a rigid, electrically insulating substrate with one or more electrically conductive tracks or wires located on its surface. The size and shape of the electrically insulating substrate may allow it to be inserted directly into the substrate being heated. If the electrically insulating substrate is not sufficiently rigid, the heating element may comprise additional amplifying means. Current may flow through one or more electrically conductive tracks to heat the heating element and the substrate being heated.

In some embodiments, the heater comprises an induction heating device. The induction heating device may comprise an induction coil and a power supply configured to supply a high-frequency oscillating current to the induction coil. In the context of this document, "high-frequency oscillating current" means an oscillating current with a frequency of from approximately 500 kHz to approximately 30 MHz. The heater may advantageously comprise a DC-to-AC converter for converting the DC current supplied by the DC power supply into an AC current. The induction coil may be designed to generate a high-frequency oscillating electromagnetic field upon receiving the high-frequency oscillating current from the power supply. The induction coil may be designed to generate a high-frequency oscillating electromagnetic field in the cavity of the device. In some embodiments, the induction coil may substantially surround the cavity of the device. The induction coil may extend at least partially along the length of the cavity of the device.

The heater of the aerosol-generating device or heating device may comprise an induction heating element. The induction heating element may be a susceptor element. As used herein, the term "susceptor element" refers to an element comprising a material capable of converting electromagnetic energy into heat. When the susceptor element is placed in an alternating electromagnetic field, the susceptor heats up. Heating of the susceptor element may result from at least one of hysteresis losses and eddy currents induced in the susceptor, depending on the electrical and magnetic properties of the susceptor material.

The current-receiving element can be designed such that, when the test article is placed in the cavity of the aerosol-generating device, the oscillating electromagnetic field generated by the induction coil induces a current in the current-receiving element, which leads to heating of the current-receiving element. In these embodiments, the aerosol-generating device is preferably capable of generating a fluctuating electromagnetic field having a magnetic field strength (field strength H) from 1 to 5 kiloamperes per meter (kA/m), preferably from 2 to 3 kA/m, for example, approximately 2.5 kA/m. The electrical aerosol-generating device is preferably capable of generating a fluctuating electromagnetic field having a frequency from 1 to 30 MHz, for example from 1 to 10 MHz, for example from 5 to 7 MHz.

In these embodiments, the current-receiving element is preferably positioned in contact with the heated substrate. In some embodiments, the current-receiving element is positioned within an aerosol-generating device. In these embodiments, the current-receiving element may be positioned within a cavity of the device or a heating chamber. The aerosol-generating device may comprise only one current-receiving element. The aerosol-generating device may comprise multiple current-receiving elements. In some embodiments, the current-receiving element is preferably configured to heat the outer surface of the heated substrate.

Most preferably, the test article comprises a current collector or current collector element. The current collector is preferably located within the heated substrate. The current collector may be positioned in contact with the heated substrate. The current collector may extend along the heated substrate. The current collector may extend substantially parallel to the longitudinal axis of the elongated base portion. The current collector may be substantially aligned with the central longitudinal axis defined by the elongated base portion. The current collector is preferably embedded within the heated substrate.

The current collector can be configured to be inserted into a heated substrate. The material of the heated substrate can surround the current collector. The material of the heated substrate can be wrapped around the current collector. The heated substrate can form a housing into which the current collector can be inserted. This advantageously allows for replacement of the current collector, as the current collector may wear out before the surrounding heated substrate. The current collector and the heated substrate can define a heated segment or a segment of the heated substrate.

The current collector may comprise any suitable material. The current collector may be formed from any material that can be inductively heated to a temperature sufficient to release volatile compounds from the heated substrate. Suitable materials for an elongated current collector include graphite, molybdenum, silicon carbide, stainless steel, niobium, aluminum, nickel, nickel compounds, titanium, and metallic composites. Some current collectors contain metal or carbon. Advantageously, the current collector may comprise or consist of a ferromagnetic material, such as ferritic iron, a ferromagnetic alloy such as ferromagnetic steel or stainless steel, ferromagnetic particles, and ferrite. A suitable current collector may be made of or comprise aluminum. The current collecting element preferably contains more than about 5 percent, preferably more than about 20 percent, more preferably more than about 50 percent, or more than about 90 percent ferromagnetic or paramagnetic materials. Some elongated current collecting elements can be heated to a temperature in excess of about 250 degrees Celsius.

The current-collecting element may comprise a non-metallic core with a metallic layer located on the non-metallic core. For example, the current-collecting element may comprise metallic tracks formed on the outer surface of a ceramic core or substrate.

Preferably, the elongated base portion is configured to support a heated substrate. The test article may comprise a substrate cavity for accommodating the heated substrate. The substrate cavity may be formed within the elongated base portion. The substrate cavity may extend along the elongated base portion. The cross-section of the substrate cavity may correspond to the cross-sectional shape of the heated substrate or a segment of the heated substrate. The segment of the heated substrate preferably has a substantially rectangular cross-section. Thus, the cross-section of the substrate cavity may be rectangular to correspond to the shape of the segment of the heated substrate.

Preferably, the elongated main portion is formed from a polymeric material. More preferably, the elongated main portion is formed from a plastic material. Even more preferably, the elongated main portion is formed from a thermoplastic material, such as polyetheretherketone (PEEK). Plastic materials such as PEEK have been found to be suitable for withstanding the high temperatures within the heating chamber. PEEK also has the appropriate heat resistance and mechanical strength for actual testing applications.

The elongated main body may extend between the far end and the near end. The far end may also be called the first end or upstream end. The near end may also be called the second end, the mouthpiece end, or the downstream end.

Both ends of the elongated base portion may be open. In other words, each end of the elongated base portion forms an opening. In such embodiments, the elongated base portion may be hollow. The elongated base portion may comprise a hollow tube, preferably cylindrical.

The elongated main body may form an air passage extending downstream from the distal end to the proximal end. The elongated main body may form an air passage extending from the upstream end to the downstream end. This air passage allows for airflow testing through the aerosol-generating device and the test article, as well as testing of any puff sensors present within the aerosol-generating device.

Alternatively, both ends of the elongated main portion are substantially closed. In other words, both ends of the elongated main portion comprise an end surface or wall. In such embodiments, a portion of the elongated main portion need not be hollow. In other words, a portion of the elongated main portion may be solid. Preferably, the near or upper portion of the elongated main portion is solid. This allows the elongated main portion to absorb heat.

The substrate cavity may have dimensions or sizes such that the heated substrate is retained within the substrate cavity upon insertion. Preferably, the substrate cavity is formed by the surface of the inner cavity of the elongated base portion, and the surface of the cavity is configured to form an interference fit or press fit with a portion of the heated substrate. In other words, the substrate cavity may engage a portion of the heated substrate to retain the heated substrate within it. The heated substrate, particularly when comprising fibrous or fabric material, may expand within the substrate cavity, thereby facilitating retention of the substrate material within the elongated base portion.

The test article may comprise an insertion opening for providing a heated substrate with access to the substrate cavity. The insertion opening may be formed on the elongated base portion. Before inserting the test article into the heating chamber of the test article, the heated substrate may be inserted into the substrate cavity of the article through the insertion opening. The insertion opening may allow for the easy removal of the heated substrate from the test article and easy insertion into it. A portion of the insertion opening may be configured to accommodate or retain the heated substrate within the elongated base portion. A portion of the insertion opening may be configured to accommodate the heated substrate within the elongated base portion. A portion of the insertion opening may be configured to retain the heated substrate within the elongated base portion. A portion of the insertion opening may be configured to accommodate and retain the heated substrate within the elongated base portion.

An insertion opening may extend between two opposing end portions of the insertion opening. The opposing end portions of the insertion opening may be configured to accommodate or retain a heated substrate within the elongated main portion. A portion of the insertion opening may be configured to form an interference fit, a press fit, or a tight fit with a portion of the heated substrate. In other words, portions of the heated substrate may engage the end portions of the insertion opening to retain the heated substrate within the substrate cavity. The insertion opening may be an insertion slot. The insertion slot or insertion opening may advantageously facilitate the replacement of the heated substrate and the susceptor, if present, and also facilitate the placement of the substrate cavity during such replacement.

The insertion opening may be positioned along the elongated base portion. In other words, the insertion opening may extend along the elongated base portion. The insertion opening may extend along a direction parallel to the longitudinal axis defined by the elongated base portion. The insertion opening may be provided on a lateral or peripheral wall of the elongated base portion. In such embodiments, the heated substrate, along with the current collector, if present, may be inserted into the elongated base portion through the side of the base portion. The insertion opening may be provided on the lower portion or the upstream half of the elongated base portion.

Alternatively, the insertion opening may be located at the end of the elongated main portion. In other words, the insertion opening may be provided on the end wall of the elongated main portion. The insertion opening may extend along a direction perpendicular to the longitudinal axis defined by the elongated main portion. The insertion opening may be located at the distal or upstream end of the elongated main portion. In such embodiments, the heated substrate, along with the current collector, if present, may be inserted into the elongated main portion through the end of the main portion.

The insertion opening is preferably located above the substrate cavity of the test article. This facilitates insertion and removal of the substrate, which may contain a susceptor, into and from the test article. The shape of the insertion opening is preferably substantially rectangular.

The test article may further comprise one or more cooling holes for establishing fluid communication between the heated substrate and the outer portion of the test article, wherein one or more cooling holes are formed on the elongated base portion. The cooling hole may be positioned along the elongated base portion. In other words, the cooling hole may extend along the elongated base portion. The cooling hole may extend along a direction parallel to the longitudinal axis defined by the elongated base portion. The test article may comprise two cooling holes, wherein the two cooling holes may be spaced apart in the longitudinal direction on the elongated base portion. The cooling hole may be provided on the lower, distal, or upstream half of the elongated base portion. One or more cooling holes may be at least partially located above the substrate cavity.

The cooling hole may be located circumferentially around the periphery of the elongated main portion. The insertion slot or opening may be spaced apart relative to the cooling hole along the periphery of the elongated main portion. The insertion opening may be positioned at an angular or circumferential offset relative to one or more cooling holes. The insertion opening may be positioned circumferentially offset by approximately 90 degrees relative to one or more cooling holes.

One or more cooling holes, particularly in embodiments in which the ends of the elongated main portion are closed, allow heat to dissipate from the heated substrate during heating, thereby allowing the test article to accurately simulate the air flow and cooling conditions that the aerosol-generating article will experience during normal use.

The test article may further comprise a thermal insulation element surrounding a portion of the elongated base portion. If the test article comprises an insertion opening or a cooling hole, the thermal insulation element may be positioned at least above one or more openings or apertures formed on the elongated base portion. The thermal insulation element may be positioned tightly around the periphery of the elongated base portion. While the thermal insulation element is preferably positioned tightly around the elongated base portion, the thermal insulation element may be slidable along the elongated base portion, preferably with the application of force to overcome any friction. This allows access to the insertion opening and adjustment of the degree of overlap of the cooling hole. The thermal insulation element preferably surrounds the entire periphery of the elongated base portion.

Each or each thermal insulation element may be in the form of a sleeve or sheath. The test article may contain multiple thermal insulation elements arranged in different longitudinal positions along the elongated base portion. Each or each thermal insulation element may be wrapped around the elongated base portion.

The thermal insulation element may primarily prevent heat dissipation from the substrate cavity of the test article during testing. The thermal insulation element may comprise a polyimide material, polyimide film, or tape. The thermal insulation element may be an adhesive polyimide film. The thermal insulation element may comprise a Kapton film or tape. Kapton ^™ is available commercially from DuPont de Nemours, Inc.

The thickness of the thermal insulation element may be from approximately 0.2 mm to approximately 0.3 mm. The thickness of the thermal insulation element may be from approximately 0.2 mm to approximately 0.25 mm. The thickness of the thermal insulation element may be from approximately 0.24 mm to approximately 0.3 mm.

As discussed above, the elongated main portion may comprise a hollow tube extending between the distal end and the proximal end. The substrate to be heated may be housed within the hollow tube. The substrate to be heated may be housed within a substrate cavity formed within the hollow tube.

The test article may contain a filter segment (element). The filter segment may be located within the elongated main portion. The filter segment may be positioned downstream of the heated substrate. The filter segment may be positioned at the downstream end or mouthpiece end of the test article. The filter segment may extend from the downstream end or mouthpiece end of the test article.

The filter segment may comprise at least one mouthpiece filter segment formed from a fibrous filter material. Suitable fibrous filter materials will be known to those skilled in the art. Particularly preferred is that at least one mouthpiece filter segment comprises a cellulose acetate filter segment formed from cellulose acetate tow.

In certain preferred embodiments, the filter segment consists of a single mouthpiece filter segment. In alternative embodiments, the filter segment comprises two or more mouthpiece filter segments, axially aligned with one another in end-to-end contact.

Preferably, the filter segment has a low particle filtration efficiency.

The mouthpiece diameter may range from approximately 5 mm to approximately 10 mm. The mouthpiece diameter may range from approximately 6 mm to approximately 8 mm. The mouthpiece diameter may range from approximately 7 mm to approximately 8 mm. The filter segment diameter may be approximately 7.2 mm, plus or minus 10 percent. The filter segment diameter may be approximately 7.25 mm, plus or minus 10 percent.

Unless otherwise specified, the resistance to draw (RTD) of a component or test article is measured in accordance with ISO 6565-2015. RTD refers to the pressure required to force air through the entire length of the component. The terms "pressure drop" or "resistance to draw" of a component or article may also refer to "resistance to draw." Such terms generally refer to measurements in accordance with ISO 6565-2015, which are typically performed under test conditions at a volumetric flow rate of approximately 17.5 milliliters per second at the outlet or downstream end of the component being measured, a temperature of approximately 22 degrees Celsius, a pressure of approximately 101 kPa (approximately 760 Torr), and a relative humidity of approximately 60%.

The resistance to draw (RTD) of the filter segment may be at least about 0 mm H2O. The RTD of the filter segment may be at least about 3 mm H2O. The RTD of the filter segment may be at least about 6 mm H2O.

The RTD of the filter segment may be no more than approximately 12 mm H2O. The RTD of the filter segment may be no more than approximately 11 mm H2O. The RTD of the filter segment may be no more than approximately 10 mm H2O.

The draw resistance of the filter segment may be greater than or equal to approximately 0 mm H2O and less than approximately 12 mm H2O. Preferably, the draw resistance of the filter segment may be greater than or equal to approximately 3 mm H2O and less than approximately 12 mm H2O. The draw resistance of the filter segment may be greater than or equal to approximately 0 mm H2O and less than approximately 11 mm H2O. Even more preferably, the draw resistance of the filter segment may be greater than or equal to approximately 3 mm H2O and less than approximately 11 mm H2O. Even more preferably, the draw resistance of the filter segment may be greater than or equal to approximately 6 mm H2O and less than approximately 10 mm H2O. Preferably, the draw resistance of the filter segment may be approximately 8 mm H2O.

As mentioned above, the filter segment or the filter segment of the mouthpiece may be formed from a fibrous material. The filter segment may be formed from a porous material. The filter segment may be formed from a biodegradable material. The filter segment may be formed from a cellulosic material, such as cellulose acetate. For example, the filter segment may be formed from a bundle of cellulose acetate fibers having a denier per fiber of approximately 10 to approximately 15. For example, the filter segment is formed from a relatively low-density cellulose acetate tow, such as a cellulose acetate tow containing fibers with a denier per fiber of approximately 12.

The filter segment can be formed from a polylactic acid-based material. The filter segment can be formed from a bioplastic material, preferably a starch-based bioplastic material. The filter segment can be produced by injection molding or extrusion. Bioplastic-based materials are advantageous because they can provide filter segment structures that are simple and inexpensive to manufacture with a defined and complex cross-sectional profile, which can contain multiple relatively large airflow channels passing through the filter segment material, providing suitable RTD characteristics.

The filter segment may be formed from a sheet of suitable material that has been corrugated, pleated, gathered, woven, or folded into an element that forms a plurality of longitudinally extending channels. Such a sheet of suitable material may be formed from paper, cardboard, a polymer such as polylactic acid, or any other cellulose-based material, paper-based material, or bioplastic-based material. The cross-sectional profile of such a filter segment may show the channels as randomly oriented.

The filter segment may be formed in any other suitable manner. For example, the filter segment may be formed from a bundle of longitudinally extending tubes. The longitudinal tubes may be formed from polylactic acid. The filter segment may be formed by extrusion, casting, layering, injection, or milling of a suitable material. Thus, it is preferable to have a small pressure drop (or RTD) from the upstream end of the filter segment to the downstream end of the filter segment.

The length of the filter segment may be at least approximately 3 mm. The length of the filter segment may be at least approximately 5 mm. The length of the filter segment may be equal to or less than approximately 11 mm. The length of the filter segment may be equal to or less than approximately 9 mm. The length of the filter segment may range from approximately 3 mm to approximately 11 mm. The length of the filter segment may range from approximately 5 millimeters to approximately 9 millimeters. Preferably, the length of the filter segment may be approximately 7 mm.

The test article may comprise an upstream segment or a leading segment. The upstream segment may be located within the elongated main portion. The upstream segment may be positioned upstream of the heated substrate. The upstream segment may be positioned adjacent to the heated substrate. The upstream segment may be positioned at the upstream end or distal end of the test article. The upstream segment may extend from the upstream end or distal end of the test article.

The upstream element may be a porous plug-like element. The upstream element may be formed from an air-impermeable material.

The upstream element is formed from a hollow tubular segment that defines a longitudinal cavity, providing a channel for unrestricted flow. In such embodiments, the upstream element can provide protection for the heated substrate, as described above, while minimally impacting the overall resistance to draw (RTD) and filtration properties of the product.

The upstream element of the upstream section may be formed from any material suitable for use in the test article. The upstream element may, for example, be formed from the same material as one of the other components of the test article, such as a filter segment. Suitable materials for forming the upstream element include filter materials, polymeric material, cellulose acetate, or cardboard. The upstream element may comprise a cellulose acetate plug. The upstream element may comprise a hollow cellulose acetate tube or a cardboard tube.

The test article may contain a hollow tubular segment (element). The hollow tubular segment may be located within the elongated main portion. The hollow tubular segment may be positioned downstream of the heated substrate. The hollow tubular segment may be positioned upstream of the heated substrate. The hollow tubular segment may be positioned adjacent to the heated substrate. The hollow tubular segment may be positioned adjacent to the filter segment. The hollow tubular segment may be positioned between the heated substrate and the filter segment. The hollow tubular segment may comprise a cardboard or paper tube.

The hollow tubular segment may have an outer diameter of 5 millimeters to 12 millimeters, such as 5 millimeters to 10 millimeters, or 6 millimeters to 8 millimeters. In a preferred embodiment, the hollow tubular segment has an outer diameter of 7.2 millimeters plus or minus 10 percent.

The hollow tubular segment may have an internal diameter. Preferably, the hollow tubular segment may have a constant internal diameter along its length. However, the internal diameter of the hollow tubular segment may vary along its length.

The hollow tubular segment may have an internal diameter of at least approximately 2 millimeters. For example, the hollow tubular segment may have an internal diameter of at least approximately 4 millimeters, at least approximately 5 millimeters, or at least approximately 7 millimeters.

The hollow tubular segment may have an internal diameter of no more than approximately 10 millimeters. For example, the hollow tubular segment may have an internal diameter of no more than approximately 9 millimeters, no more than approximately 8 millimeters, or no more than approximately 7.5 millimeters.

The hollow tubular segment may have an internal diameter of from about 2 millimeters to about 10 millimeters, from about 4 millimeters to about 9 millimeters, from about 5 millimeters to about 8 millimeters, or from about 6 millimeters to about 7.5 millimeters.

The hollow tubular segment may have an outer diameter of approximately 7.1 or 7.2 mm. The hollow tubular segment may have an inner diameter of approximately 6.7 mm.

The lumen or cavity of a hollow tubular segment can have any cross-sectional shape. The lumen of a hollow tubular segment can have a circular cross-sectional shape.

The hollow tubular segment may comprise a paper-based material. The hollow tubular segment may comprise at least one layer of paper. The paper may be a very rigid paper. The paper may be a corrugated paper, such as corrugated heat-resistant paper or corrugated parchment paper.

Preferably, the hollow tubular segment may comprise cardboard. The hollow tubular segment may be a cardboard tube. The hollow tubular segment may be formed from cardboard.

The hollow tubular segment may be a paper tube. The hollow tubular segment may be formed from a tube of spirally wound paper. The hollow tubular segment may be formed from multiple layers of paper. The paper may have a basis weight of at least about 50 grams per square meter, at least about 60 grams per square meter, at least about 70 grams per square meter, or at least about 90 grams per square meter.

The hollow tubular segment may comprise a polymeric material. For example, the hollow tubular segment may comprise a polymeric film. The polymeric film may comprise a cellulose film. The hollow tubular segment may comprise low-density polyethylene (LDPE) or polyhydroxyalkanoate (PHA) fibers. The hollow tubular segment may comprise cellulose acetate tow.

When the hollow tubular segment comprises cellulose acetate tow, the cellulose acetate tow may have a denier per fiber of from about 2 to about 4 and a total denier of from about 25 to about 40.

Preferably, the cavity for the test article substrate is formed between the hollow tubular segment and an upstream segment. The filter, hollow tubular, and upstream segments, as well as the heated substrate (and susceptor, if present), are preferably inserted into the elongated base portion. Such segments preferably form an interference fit or press fit with the inner peripheral surface of the elongated base portion. Such segments preferably form an airtight fit with the inner peripheral surface of the elongated base portion.

The length of the test article may range from approximately 35 mm to approximately 50 mm. The length of the test article may range from approximately 38 mm to approximately 47.5 mm. The length of the test article may be approximately 40 mm. The length of the test article may be approximately 45 mm.

The outside diameter of the test article may range from approximately 6 mm to approximately 8 mm. The outside diameter of the test article may range from approximately 6.5 mm to approximately 8 mm. The outside diameter of the test article may range from approximately 6.5 mm to approximately 7.5 mm. The outside diameter of the test article may range from approximately 7 mm. The outside diameter of the test article may range from approximately 7.25 mm.

The test article may include a cooling channel for coolant flowing through it. The cooling channel may extend through the heated substrate, and the cooling channel may be configured to be in fluid communication with a source of coolant. The inlet and outlet of the cooling channel may be configured to be in fluid communication with the source of coolant, forming a cooling circuit. The cooling circuit may act as a heat exchanger.

The test system may further comprise a coolant source and a pump for pumping coolant from the coolant source through a cooling channel. The coolant source may comprise a thermostatic bath, with the pump and coolant located therein. The thermostatic bath may be configured to maintain the coolant temperature at a predetermined temperature level. The pump may be in fluid communication with the inlet and outlet of the cooling channel, so that the coolant can be pumped from the thermostatic bath through the cooling channel. Providing such a cooling channel and cooling device may be advantageous for preventing overheating of the heated substrate and the susceptor, if present, thereby maximizing the service life of the heated substrate and reducing testing costs. Additionally, providing such a cooling device may also simulate the heat exchange and dissipation that occur during tightening, thereby eliminating the need to tighten relative to the test article during testing.

According to the present invention, a method for testing an aerosol-generating device with a test article according to the present invention is provided. The method may include the steps of: inserting the test article into a heating chamber containing a heating element; performing a test cycle, wherein the test cycle includes: activating the heating element to heat the test article placed inside the heating chamber; and deactivating the heating element. The heating chamber may be a heating chamber of an aerosol-generating device.

The heating element can be activated by pressing a button on the heating or aerosol-generating device, or by drawing air through the test article, which can be detected by the device's puff sensor. The controller in the device can be configured to control the power supply to the heating element to heat it.

Each test cycle may include drawing air through the test article. The method preferably includes performing multiple test cycles. The method preferably includes performing at least 100 test cycles, preferably at least 1,000 test cycles, more preferably at least 2,500 test cycles, and even more preferably at least 5,000 test cycles.

The testing method may further include the step of replacing the heated substrate of the test article with a new heated substrate. This step may be performed after the aforementioned plurality of test cycles have been completed.

In embodiments providing a test system having a cooling device as described above, the testing method may include the steps of: inserting a test article into a heating chamber containing a heating element; and performing a test cycle, wherein the test cycle includes: activating the heating element to heat the test article placed inside the heating chamber; controlling a pump to cause coolant from a coolant source to flow through a cooling channel; and deactivating the heating element. The heating chamber may be a heating chamber of an aerosol generating device.

The test article may include a pressure sensor to provide pressure data during the test. The test article may include a temperature sensor to provide temperature data during the test. The test method may further include the step of obtaining measurement data during the test cycle. The test method may further include the step of recording measurement data during the test cycle. The measurement data may include one or more of pressure data, draw resistance data, airflow data, and temperature data within the test article or in the heating chamber of the aerosol-generating device. The measurement data may include power information regarding the power supplied by the device's power source to the heating element.

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

EX1. A test article for insertion into a heating chamber configured to accommodate aerosol-generating articles, the test article comprising:

an elongated main portion adapted to be placed inside the heating chamber; and

a heated substrate configured to be placed within the elongated base portion, wherein the heated substrate is configured to be heated when the test article is placed within the heating chamber, wherein the heated substrate is a non-aerosol generating substrate.

EX1A. A test article for insertion into the heating chamber of an aerosol generating device, the test article comprising:

an elongated main portion configured to be placed within the heating chamber of the aerosol generating device; and

a heated substrate configured to be placed within the elongated base portion, wherein the heated substrate is configured to be heated when the test article is placed within the heating chamber of the aerosol generating device, wherein the heated substrate is a non-aerosol generating substrate.

EX2. A test article according to any preceding example, wherein the heated substrate does not contain tobacco material.

EX3. A test article according to any preceding example, wherein the heated substrate comprises fibrous material.

EX4. A test article according to any of the examples EX1-EX3, wherein the heated substrate comprises carbon fibers, a bundle, or a fibrous mass.

EX5. A test article according to any of the examples EX1-EX3, wherein the heated substrate comprises aramid fibers, bundle or fibrous mass.

EX6. A test article according to any of the examples EX1-EX3, wherein the heated substrate comprises Kevlar fibers, bundle or fibrous mass.

EX7. A test article according to any of the examples EX1-EX3, wherein the heated substrate comprises a mixture of carbon fibers, bundle or fibrous mass and aramid fibers, bundle or fibrous mass.

EX8. A test article according to any preceding example, wherein the elongated base portion is configured to hold a heated substrate.

EX9. A test article according to any preceding example, further comprising a substrate cavity for receiving a heated substrate, wherein the substrate cavity is formed within the elongated base portion.

EX10. A test article according to any preceding example, wherein the elongated main portion is formed of a polymeric material.

EX11. A test article according to any preceding example, wherein the elongated main part is formed of a plastic material.

EX12. A test article according to any preceding example, wherein the elongated main portion is formed from a thermoplastic material, preferably polyetheretherketone (PEEK).

EX13. A test article according to any one of EX1-EX12, wherein the elongated main portion extends between the distal end and the proximal end, wherein both ends of the elongated main portion are open.

EX14. A test article according to any one of EX1-EX13, wherein the elongated main portion forms an air passage extending downstream from the far end to the near end.

EX15. A test article according to any one of Examples EX1-EX12, wherein the elongated main portion extends between the distal end and the proximal end, wherein both ends of the elongated main portion are closed.

EX16. A test article according to example EX9, wherein the substrate cavity has dimensions such that the heated substrate is retained within the substrate cavity when inserted.

EX17. A test article according to example EX9, wherein the cavity for the substrate is formed by the inner surface of the cavity of the elongated main part, and the surface of the cavity is designed to form an interference fit with a portion of the heated substrate.

EX18. A test article according to any preceding example, further comprising an insertion opening for providing a heated substrate with access to the substrate cavity, wherein the insertion opening is formed on the elongated base portion.

EX19. A test article according to example EX18, wherein the insertion opening portion is configured to accommodate or retain a heated substrate within the elongated base portion.

EX20. A test article according to example EX18, wherein the opposite end portions of the insertion opening are configured to accommodate or retain a heated substrate within the elongated base portion.

EX21. A test article according to example EX18, wherein a portion of the insertion opening is configured to form an interference fit with a portion of the heated substrate.

EX22. A test article according to any of EX18-EX21, wherein the insertion opening is an insertion slot.

EX23. A test article according to any of the examples EX18-EX22, wherein the insertion opening is located in a position along the elongated base portion.

EX24. A test article according to example EX23, wherein the insertion opening extends along a direction parallel to the longitudinal axis formed by the elongated base portion.

EX25. A test article according to example EX23 or EX24, wherein the insertion opening is provided on the side or peripheral wall of the elongated main part.

EX26. A test article according to any of the examples EX18-EX22, wherein the insertion opening is located at the distal end of the elongated base portion.

EX27. A test article according to example EX26, wherein the insertion opening extends along a direction perpendicular to the longitudinal axis formed by the elongated base portion.

EX28. A test article according to example EX26 or EX27, wherein the insertion opening is provided in the wall of the far end of the elongated main part.

EX29. A test article according to any preceding example, further comprising a cooling hole for forming a fluid communication between the heated substrate and the exterior of the test article, wherein the cooling hole is formed on the elongated base portion.

EX30. A test article according to any preceding example, further comprising a thermal insulation element surrounding a portion of the elongated main part.

EX31. A test article according to any preceding example, wherein the thermal insulation element is located over one or more openings or apertures formed in the elongated base portion.

EX32. A test article according to any one of Examples EX1-EX14, wherein the elongated main portion comprises a hollow tube extending between the distal end and the proximal end, and wherein the heated substrate is located within the hollow tube.

EX33. The test article according to example EX32, further comprising a filter segment, wherein the filter segment is located within the elongated main part and further downstream of the heated substrate.

EX34. A test article according to example EX32 or EX33, further comprising a hollow tubular segment, wherein the hollow tubular segment is located within the elongated main portion and further downstream of the heated substrate.

EX35. A test article according to any of the examples EX32-EX34, further comprising an upstream segment, wherein the upstream segment is located within the elongated main portion and upstream of the heated substrate.

EX36. The test article according to example EX32, further comprising an upstream segment located adjacent to the heated substrate, a hollow tubular segment located adjacent to the heated substrate, and a filter segment located adjacent to the hollow tubular segment, wherein the upstream segment, the hollow tubular segment, and the filter segment are located within the hollow tube.

EX37. A test article according to example EX34 or EX36, wherein the hollow tubular segment comprises a cardboard or paper tube.

EX38. A test article according to any preceding example, further comprising a current collector, wherein the substrate is located within the heated substrate.

EX39. Test article according to example EX38, with the current collector passing along the heated substrate.

EX40. A test article according to example EX38, wherein the current collector extends substantially parallel to the longitudinal axis of the elongated base portion.

EX41. A test article according to example EX38, wherein the current collector is substantially aligned with the central longitudinal axis formed by the elongated base portion.

EX42. A test article according to any preceding example, further comprising a cooling channel for coolant to flow therethrough, wherein the cooling channel extends through the heated substrate, and wherein the cooling channel is configured to be in fluid communication with a source of coolant.

EX43. A test article according to example EX42, wherein the inlet and outlet of the cooling channel are configured to be in fluid communication with a source of coolant to form a cooling circuit.

EX44. A test article as per any preceding example, wherein the length of the test article is between 35 mm and 45 mm.

EX45. A test article as in any preceding example, wherein the outside diameter of the test article is between 6 mm and 8 mm.

EX46. Test article according to example EX30 or EX31, wherein the thickness of the thermal insulation element is from 0.2 mm to 0.3 mm.

EX47. A test system comprising a test article according to any preceding example and an aerosol generating device, wherein the aerosol generating device comprises a heating chamber and a heating element for externally heating the article located within the heating chamber.

EX48. Test system according to EX47, wherein the heating element is an induction heating element.

EX49. A test system comprising a test article according to example EX42, or EX43, or EX47, a coolant source, and a pump for pumping coolant from the coolant source through a cooling channel.

EX50. A method for testing an aerosol generating device using a test article according to any of the preceding examples, comprising the steps of:

inserting the test article into the heating chamber of an aerosol generating device containing a heating element; and

execution of a test cycle, where the test cycle includes:

activating a heating element to heat a test article placed inside the heating chamber; and

deactivation of the heating element.

EX51. A method for testing an aerosol generating device according to EX50, wherein each test cycle includes drawing air through the test article.

EX52. A method for testing an aerosol generating device according to example EX50 or EX51, wherein a plurality of test cycles are performed.

EX53. A method for testing an aerosol generating device according to any of Examples EX50-EX52, further comprising the step of replacing the heated substrate of the test article.

EX54. A method for testing an aerosol generating device using a test article of a test system according to EX49, comprising the steps of:

inserting the test article into the heating chamber of an aerosol generating device containing a heating element; and

execution of a test cycle, where the test cycle includes:

activating the heating element to heat the test article placed inside the heating chamber;

controlling the pump so that coolant from the coolant source flows through the cooling channel; and

deactivation of the heating element.

The present invention will now be further described with reference to the accompanying drawings, in which:

Fig. 1 is an exploded isometric view of a test article in accordance with one embodiment of the present invention;

each of Fig. 2A and 2B shows a schematic side view of the test article shown in Fig. 1;

each of Fig. 3A and 3B further shows a schematic side view of an embodiment of the test article shown in Fig. 1;

each of Fig. 4A and 4B shows a schematic side view of another embodiment of a test article in accordance with the present invention;

Fig. 5 is a schematic side view of another embodiment of a test article in accordance with the present invention;

each of Figs. 6A and 6B shows a schematic side view of another embodiment of a test article in accordance with the present invention;

Fig. 7 shows a schematic side sectional view of a test system article in accordance with the present invention; and

Fig. 8 shows a schematic side sectional view of another test system in accordance with the present invention.

Fig. 1 shows a test article 1 for use in an aerosol-generating device. The test article 1 is designed to be inserted into a heating chamber of the aerosol-generating device and is designed to be heated therein.

Test article 1 comprises a cylindrical elongated main portion 14 extending between a distal end 2 and a proximal end 3. Test article 1 comprises a heated substrate 12, which is configured to be placed in the elongated main portion 14. Test article 1 further comprises a current collector 11, configured to be placed inside the heated substrate 12, as shown in Fig. 1. The heated substrate 12 and the current collector 11 form a segment 23 of the heated substrate. The heated substrate 12 comprises a mixture of carbon fiber and aramid fibers and does not contain a material of plant origin, such as tobacco. The elongated main portion 14 is formed from PEEK.

Test article 1 comprises a substrate cavity 18 formed inside an elongated main portion 14. A segment 23 of the heated substrate is configured to be placed entirely inside the substrate cavity 18 (or inserted into it) by means of an insertion slot 15, as shown in Fig. 2B. The insertion slot 15 is located along the elongated main portion 14. In other words, the insertion slot 15 is located on the side of the elongated main portion 14. Consequently, the segment 23 of the heated substrate is inserted through the side of the elongated main portion 14.

As shown in Fig. 2B, the opposite portions 181, 182 of the inner surface forming the cavity 18 for the substrate are configured to engage with the segment 23 of the substrate and retain it in the cavity 18 when the segment 23 of the substrate is inserted. The slot 15 for insertion also provides means for guiding the segment 23 of the substrate into the cavity 18.

As shown in Fig. 1 and 2A, the test article 1 comprises at least two cooling holes 16, 17 located above the cavity 18 for the substrate. As shown in Fig. 2A, the cooling holes 16, 17 are located along the lower (or located upstream) part of the elongated main part 14 and are spaced apart in the longitudinal direction relative to each other. The cooling holes 16, 17 are configured to provide fluid communication between the cavity 18 and the outer part of the test article 1, so that heat from the segment 23 of the heated substrate can be dissipated when the test article 1 is heated inside the aerosol generating device or the heating device during the test.

Additionally, the test article 1 comprises three thermal insulation sleeves 13 surrounding the elongated main part 14. The three thermal insulation sleeves 13 are spaced apart in the longitudinal direction along the elongated main part 14. One of the thermal insulation sleeves 13A is partially located above both cooling openings 16, 17, as shown in Fig. 2A. As shown in Fig. 3B, the same thermal insulation sleeve 13A is partially located above the insertion slot 18. Each of the thermal insulation sleeves 13 is formed from a polyimide material.

In the embodiment shown in Fig. 1, 2A and 2B, both ends 2, 3 of the elongated main part 14 are closed. Fig. 3B schematically illustrates the insertion of a segment 23 of a heated substrate into the elongated main part 14 through an insertion slot 15. The length h of the elongated main part 14 is approximately 40 mm, and the outer diameter b of the elongated main part 14 is 7 mm.

The embodiment shown in Fig. 4A and 4B is similar to the first embodiment in Fig. 1, 2A, 2B, 3A and 3B and is characterized in that the elongated main part 104 is a hollow tube having open distal and proximal ends. Therefore, the test article 10 comprises a hollow elongated main part 104, which forms an air passage passing between the open distal end 2 and the open proximal end 3. Air can therefore flow through the test article 10 during the puff test. In the embodiment in Fig. 4A and 4B, the length h of the elongated main part 14 is approximately 40 mm, and the outer diameter b of the elongated main part 14 is 7 mm. Considering that the elongated main part is hollow, the inner diameter r _i is determined. As an example, such an internal diameter may be approximately 5 mm. A thermal insulation sleeve (not shown) may be provided around the insertion slot 15.

The embodiment shown in Fig. 5 is similar to the second embodiment in Fig. 4A and 4B, but differs in that the opening 1005 for inserting the test article 100 is located at the distal end 3 of the elongated main part 1004 instead of being located along the side of the elongated main part, and heat-insulating sleeves and cooling holes are not provided. The elongated main part 1004 is also hollow. The upstream or lower part of the elongated main part 1004 forms a cavity 18 for the substrate. The cavity 18 for the substrate is formed by the inner surface of the hollow elongated main part 1004. Such an inner surface has such dimensions that it is designed to accommodate and hold the segment 23 of the substrate to be heated inside the cavity 18 for the substrate. As shown in Fig. 5, the cross-section of the cavity 18 is substantially rectangular to match the substantially rectangular cross-section of the segment 23 of the heated substrate. Air can flow through the distal end 3 of the elongated main portion 1004, through the segment 23 of the heated substrate and exit from the near end 2 of the elongated main portion 1004. The length h and the outer diameter b can be equivalent to the embodiment in Fig. 4A and 4B.

The embodiment shown in Fig. 6A and 6B is intended to more accurately simulate a heated aerosol-generating article in terms of components. Test article 40 comprises an elongated main portion 414, which has the shape of a hollow tube. The elongated main portion 414 is made of PEEK. The elongated main portion 414 accommodates, in a linear sequential order and with an adjoining connection, an upstream segment 413, a heated substrate segment 423, a hollow tubular segment 416, which forms an empty cavity 422, and a filter segment 418. The upstream segment 413 and the hollow tubular segment 422 form a substrate cavity in which the heated substrate segment 423 is placed.

The heated substrate segment 423 comprises the heated substrate 413 and an elongated current-collecting element 411 located centrally within the heated substrate 413. In other words, the current-collecting element 411 is embedded within the heated substrate 413. The heated substrate 413 comprises aramid fibers. The hollow tubular segment 416 is made of cardboard. The filter segment 418 is a plug made of cellulose acetate. The upstream segment 413 is also a plug made of cellulose acetate, but may also comprise a hollow tubular segment. Air may flow axially through the test article 40. In the embodiment shown in Fig. 6A and 6B, the length of the elongated main portion 14 is approximately 45 mm, and the outer diameter of the elongated main portion 14 is approximately 7.25 mm.

Fig. 7 shows a testing system 700 comprising a test article 1, 10, 40, 100 according to any embodiment described in the present invention, and an aerosol generating device or a heating device 70 comprising a power source 706. As shown in Fig. 7, the test article 1 is placed inside a heating chamber 710 of the aerosol generating device 70. The aerosol generating device 70 comprises a heating element or heater 702 surrounding a portion of the heating chamber 710. The heating element 702 is an induction heating element and is configured to externally and inductively heat a segment of the heated substrate of the test article 1. The heating element 702 is configured to be activated or powered by the power source 706 using a controller (not shown). A puff sensor (not shown) may also be provided in the heating device 70. Air may be drawn through the air flow channel of the device 70 and through or around the test article 1.

Fig. 8 shows a schematic illustration of a testing system 800 comprising a test article, in accordance with one of the embodiments described in the present invention, inserted inside a heating chamber 17 of a testing device or an aerosol generating device. The test article 1 comprises a cooling channel 24 for coolant flowing therethrough. The cooling channel 24 passes through the heated substrate 12, and the cooling channel 24 is configured to be in fluid communication with a coolant source 5. The coolant source 5 comprises a pump 51 located therein. An inlet and an outlet of the cooling channel 24 are configured to be in fluid communication with the coolant source 5 to form a cooling circuit. Namely, the inlet and the outlet of the cooling channel 24 are in fluid communication with the pump 51 to form a cooling circuit. Pump 51 is configured to pump coolant from coolant source 5 through cooling channel 24. A portion of cooling channel 24 is located near current-collecting element 11 to extract heat from it. Cooling channel 24, passing through heated substrate 12, also extracts heat from heated substrate 12. Such test system 800 is designed without the possibility of tightening, and the cooling circuit is configured to simulate the level of cooling provided by air flowing through an aerosol-generating article.

For the purposes of the present description and the appended claims, except where otherwise indicated, all numbers expressing quantities, amounts, percentages, etc., are to be understood as modified in all instances by the term "about." Also, all ranges include the disclosed maximum and minimum points and include any intermediate ranges therebetween, which may or may not be specifically listed herein. Therefore, in this context, the number A is to be understood as A ± 10% of A. In this context, the number A can be considered to include numerical values that are within the normal standard error for measuring the property that the number A modifies. The number A, in some instances, when used in the appended claims, may deviate by the percentages listed above, provided that the amount by which A deviates does not materially affect the fundamental and novel characteristic(s) of the claimed invention. Also, all ranges include the disclosed maximum and minimum points and include any intermediate ranges therebetween, which may or may not be specifically listed herein.

Claims (26)

1. A test article for insertion into a heating chamber of an aerosol generating device for testing the device, comprising: an elongated main portion configured to be placed in the heating chamber of the aerosol generating device; and a heated substrate for placement within the elongated main portion, wherein the heated substrate is capable of being heated when the test article is placed in the heating chamber of the aerosol generating device, wherein the heated substrate is a non-aerosol generating substrate. 2. The article according to claim 1, wherein the heated substrate is free of tobacco material. 3. An article according to any one of paragraphs 1, 2, in which the heated substrate comprises a fibrous material. 4. An article according to any one of paragraphs 1-3, in which the heated substrate comprises carbon fibers, a carbon bundle or a carbon mass. 5. An article according to any of the preceding paragraphs, further comprising a cavity for accommodating a heated substrate, wherein the cavity for the substrate is formed in the elongated main portion. 6. An article according to any one of the preceding claims, wherein the elongated main portion is formed from a thermoplastic material, preferably polyetheretherketone (PEEK). 7. An article according to any one of the preceding claims, further comprising a cooling hole for fluid communication between the heated substrate and the outer portion of the test article, wherein the cooling hole is formed on the elongated base portion. 8. An article according to any of the preceding paragraphs, further comprising a thermal insulation element surrounding a portion of the elongated main part. 9. An article according to any of the preceding paragraphs, further comprising a susceptor located within the heated substrate. 10. The article according to claim 9, wherein the susceptor extends along the heated substrate. 11. A test system comprising a test article according to any of the preceding claims and an aerosol generating device, the device comprising a heating chamber and a heating element for externally heating the test article placed inside the heating chamber. 12. A method for testing an aerosol generating device using a test article according to any one of paragraphs 1-10, comprising the steps of: inserting the test article into a heating chamber of an aerosol generating device containing a heating element; and execution of a test cycle, including: activating a heating element to heat a test article placed within the heating chamber; and deactivation of the heating element. 13. The method of claim 12, wherein each test cycle includes drawing air through the test article. 14. The method according to any one of paragraphs 12, 13, in which a plurality of test cycles are performed. 15. A method for testing an aerosol generating device using a test article according to any one of claims 1-10, wherein the test article further comprises a cooling channel for flowing coolant, passing through the heated substrate and configured to communicate via a fluid medium with a source of coolant, wherein the inlet and outlet of the cooling channel are configured to communicate via a fluid medium with a source of coolant to form a cooling circuit, wherein the method includes the following steps: inserting the test article into a heating chamber of an aerosol generating device containing a heating element; and execution of a test cycle, including: activating a heating element to heat a test article placed inside the heating chamber; controlling a pump to flow coolant from a coolant source through a cooling channel; and deactivation of the heating element.