Patent Description:
Recently, there has been increasing demand for alternative ways of overcoming the disadvantages of common cigarettes. For example, there is an increasing demand for a method of generating aerosol by heating an aerosol generating material in cigarettes, rather than by burning cigarettes. Accordingly, research into a heating-type cigarette or a heating-type aerosol generator has been actively conducted.

Among aerosol generation devices, there is an externally heated aerosol generation device for generating an aerosol that may be inhaled by a user by heating an inserted cigarette from the outside of the cigarette. The externally heated aerosol generation device is characterized in that, when a cigarette including an aerosol generating substrate is inserted, an aerosol is generated by applying heat to the cigarette from the outside without direct contact of a heater with the inserted cigarette, and has a limit in that a sufficient amount of atomization is not obtained during an initial puff period in which a user starts to puff the cigarette through the aerosol generation device, because thermal energy of the heater is not smoothly transferred to the cigarette. An example of an externally heated aerosol generation device is known from <CIT>. Furthermore, <CIT> describes both, an externally heated aerosol generation device and an aerosol generation device with a heating element that is inserted into the aerosol-forming substrate. <CIT> relates to the design of an aerosol generating article containing an aerosol generating substrate. <CIT> is directed to the design of conventional tobacco cigarettes.

The present disclosure provides a cigarette that effectively receives thermal energy of a heater when the heater of an aerosol generation device is heated after the cigarette is inserted into an external heated aerosol generation device, and an aerosol generation device in which the cigarette is used.

The invention is directed to a system comprising an externally heated aerosol generation device and a cigarette.

The system is as set out in the appended set of claims. The cigarette is capable of generating an aerosol from an aerosol generating substrate included in a medium portion through external heating. It comprises: a medium portion wrapper that is wrapped around the medium portion; and - a final wrapper that is collectively wrapped around the medium portion wrapped by the medium portion wrapper and cigarette elements other than the medium portion, wherein the medium portion wrapper and the final wrapper comprise a thermal conductivity enhancement material coating or an internally added thermal conductivity enhancement material.

According to the present disclosure, there are provided an aerosol generation device capable of providing a sufficient amount of atomization to a user that uses the aerosol generation device even during an initial puff, and a cigarette used in the aerosol generation device.

The present invention provides a system with the features of claim <NUM>. Amongst others, the system comprises a cigarette which is capable of generating an aerosol from an aerosol generating substrate included in a medium portion through external heating. The cigarette comprises: a medium portion wrapper that is wrapped around the medium portion; and - a final wrapper that is collectively wrapped around the medium portion wrapped by the medium portion wrapper and cigarette elements other than the medium portion, wherein the medium portion wrapper and the final wrapper comprise a thermal conductivity enhancement material coating or an internally added thermal conductivity enhancement material.

In the system, the medium portion wrapper may be pearl-coated with a thermal conductivity enhancement material having a thermal conductivity of a preset value or more after calendering is performed.

In the system, the thermal conductivity enhancement material may be aluminum foil.

In the system, the medium portion wrapper may be a wrapper subjected to calendaring after being coated with a thermal conductivity enhancement material having a thermal conductivity of a preset value or more.

In the system, the material may be any one of sodium citrate and potassium citrate.

In the system, the medium portion wrapper may be obtained by changing at least one of tensile strength, smoothness, and stiffness of a normal porous wrapper by a preset ratio or more through work processing.

The attached drawings for illustrating one or more embodiments are referred to in order to gain a sufficient understanding, the merits thereof, and the objectives accomplished by the implementation.

<FIG> and <FIG> are diagrams showing examples in which a cigarette is inserted into an aerosol generating device.

Referring to <FIG> and <FIG>, an aerosol generator <NUM> includes a battery <NUM>, a controller <NUM>, a heater <NUM> and vaporizer <NUM>. Also, a cigarette <NUM> may be inserted into an inner space of the aerosol generator <NUM>.

The elements related to the embodiment are illustrated in the aerosol generator <NUM> of <FIG>. Therefore, one of ordinary skill in the art would appreciate that other universal elements than the elements shown in <FIG> may be further included in the aerosol generator <NUM>.

Also, <FIG> and <FIG> show that the aerosol generator <NUM> includes the heater <NUM>, but if necessary, the heater <NUM> may be omitted.

In <FIG>, the battery <NUM>, the controller <NUM>, the heater <NUM> and the vaporizer <NUM> are arranged in a row. Also, <FIG> shows that the vaporizer <NUM> and the heater <NUM> are arranged in parallel with each other. However, an internal structure of the aerosol generator <NUM> is not limited to the examples shown in <FIG>. That is, according to a design of the aerosol generator <NUM>, the arrangement of the battery <NUM>, the controller <NUM>, the heater <NUM>, and the vaporizer <NUM> may be changed.

When the cigarette <NUM> is inserted into the aerosol generator <NUM>, the aerosol generator <NUM> operates the heater <NUM> and/or the vaporizer <NUM> to generate aerosol from the cigarette <NUM> and/or the vaporizer <NUM>. The aerosol generated by the vaporizer <NUM> passes through the cigarette <NUM> and is delivered to the user. A description of the vaporizer <NUM> will be described in more detail below.

The battery <NUM> supplies the electric power used to operate the aerosol generator <NUM>. For example, the battery <NUM> may supply power for heating the heater <NUM> or the vaporizer <NUM> and supply power for operating the controller <NUM>. In addition, the battery <NUM> may supply power for operating a display, a sensor, a motor, and the like installed in the aerosol generator <NUM>.

The controller <NUM> controls the overall operation of the aerosol generator <NUM>. In detail, the controller <NUM> may control operations of other elements included in the aerosol generator <NUM>, as well as the battery <NUM>, the heater <NUM>, and the vaporizer <NUM>. Also, the controller <NUM> may check the status of each component in the aerosol generator <NUM> to determine whether the aerosol generator <NUM> is in an operable state.

The controller <NUM> includes at least one processor. It will be understood by one of ordinary skill in the art that the present disclosure may be implemented in other forms of hardware.

The heater <NUM> may be heated by the electric power supplied from the battery <NUM>. For example, when the cigarette <NUM> is inserted in the aerosol generator <NUM>, the heater <NUM> may be located outside the cigarette <NUM> Therefore, the heated heater <NUM> may raise the temperature of an aerosol generating material in the cigarette <NUM>.

The heater <NUM> may be an electro-resistive heater. For example, the heater <NUM> includes an electrically conductive track, and the heater <NUM> may be heated as a current flows through the electrically conductive track. However, the heater <NUM> is not limited to the above example, and any type of heater may be used provided that the heater is heated to a desired temperature. Here, the desired temperature may be set in advance on the aerosol generator <NUM>, or may be set by a user.

In addition, in another example, the heater <NUM> may include an induction heating-type heater. In detail, the heater <NUM> may include an electrically conductive coil for heating the cigarette <NUM> in an induction heating method, and the cigarette may include a susceptor that may be heated by the induction heating-type heater.

Referring to <FIG> and <FIG>, the heater <NUM> is shown to be disposed outside the cigarette <NUM>, but is not limited thereto. For example, the heater may include a tubular-type heating element, a plate-type heating element, a needle-type heating element, or a rod-type heating element, and may heat the inside or outside of the cigarette <NUM> according to the shape of the heating element.

Also, there may be a plurality of heaters <NUM> in the aerosol generator <NUM>. Here, the plurality of heaters <NUM> may be arranged to be inserted into the cigarette <NUM> or on the outside of the cigarette <NUM>. Also, some of the plurality of heaters <NUM> may be arranged to be inserted into the cigarette <NUM> and the other may be arranged on the outside of the cigarette <NUM>. In addition, the shape of the heater <NUM> is not limited to the example shown in <FIG>, but may be manufactured in various shapes.

The vaporizer <NUM> may generate aerosol by heating a liquid composition, and the generated aerosol may be delivered to the user after passing through the cigarette <NUM>. In other words, the aerosol generated by the vaporizer <NUM> may move along an air flow passage of the aerosol generator <NUM>, and the air flow passage may be configured for the aerosol generated by the vaporizer <NUM> to be delivered to the user through the cigarette <NUM>.

For example, the vaporizer <NUM> may include a liquid storage unit, a liquid delivering unit, and a heating element, but is not limited thereto. For example, the liquid storage unit, the liquid delivering unit, and the heating element may be included in the aerosol generator <NUM> as independent modules.

For example, the liquid composition may be a liquid including a tobacco-containing material including a volatile tobacco flavor component, or a liquid including a non-tobacco material. The liquid storage unit may be detachably attached to the vaporizer <NUM> or may be integrally manufactured with the vaporizer <NUM>.

For example, the liquid composition may include water, solvents, ethanol, plant extracts, flavorings, flavoring agents, or vitamin mixtures. The flavoring may include, but is not limited to, menthol, peppermint, spearmint oil, various fruit flavoring ingredients, etc. The flavoring agent may include components that may provide the user with various flavors or tastes. Also, the liquid composition may include an aerosol former such as glycerin and propylene glycol.

The heating element is an element for heating the liquid composition delivered by the liquid delivering unit.

For example, the vaporizer <NUM> may be referred to as a cartomizer or an atomizer, but is not limited thereto.

In addition, the aerosol generator <NUM> may further include universal elements, in addition to the battery <NUM>, the controller <NUM>, the heater <NUM>, and the vaporizer <NUM>. For example, the aerosol generator <NUM> may include a display capable of outputting visual information and/or a motor for outputting tactile information. In addition, the aerosol generator <NUM> may include at least one sensor (a puff sensor, a temperature sensor, a cigarette insertion sensor, etc.) Also, the aerosol generator <NUM> may be manufactured to have a structure, in which external air may be introduced or internal air may be discharged even in a state where the cigarette <NUM> is inserted.

Although not shown in <FIG>, the aerosol generator <NUM> may configure a system with an additional cradle. For example, the cradle may be used to charge the battery <NUM> of the aerosol generator <NUM>. Alternatively, the heater <NUM> may be heated in a state in which the cradle and the aerosol generator <NUM> are coupled to each other.

The cigarette <NUM> may be similar to a typical burning cigarette. For example, the cigarette <NUM> may include a first portion containing an aerosol generating material and a second portion including a filter and the like. Alternatively, the second portion of the cigarette <NUM> may also include the aerosol generating material. For example, an aerosol generating material made in the form of granules or capsules may be inserted into the second portion.

The entire first portion may be inserted into the aerosol generator <NUM>, and the second portion may be exposed to the outside. Alternatively, only a portion of the first portion may be inserted into the aerosol generator <NUM> or the entire first portion and a portion of the second portion may be inserted into the aerosol generator <NUM>. At this time, the aerosol is generated by as the outside air passes through the first portion, and the generated aerosol passes through the second portion and is delivered to a user's mouth.

For example, the outside air may be introduced through at least one air passage formed in the aerosol generator <NUM>. For example, the opening and closing of the air passage formed in the aerosol generator <NUM> and/or the size of the air passage may be adjusted by a user. Accordingly, the amount of smoke and a smoking impression may be adjusted by the user. In another example, the outside air may be introduced into the cigarette <NUM> through at least one hole formed in a surface of the cigarette <NUM>.

<FIG> is a drawing illustrating an example of a cigarette.

Referring to <FIG>, the cigarette <NUM> includes a tobacco rod <NUM> and a filter rod <NUM>. The first portion described above with reference to <FIG> include the tobacco rod <NUM> and the second portion includes the filter rod <NUM>.

In <FIG>, the filter rod <NUM> is shown as a single segment, but is not limited thereto. In other words, the filter rod <NUM> may include a plurality of segments. For example, the filter rod <NUM> may include a first segment for cooling down the aerosol and a second segment for filtering a predetermined component included in the aerosol. Also, if necessary, the filter rod <NUM> may further include at least one segment performing another function.

The cigarette <NUM> may be packaged by at least one wrapper <NUM>. The wrapper <NUM> may include at least one hole through which the outside air is introduced or inside air is discharged. For example, the cigarette <NUM> may be packaged by one wrapper <NUM>. In another example, the cigarette <NUM> may be packaged by two or more wrappers <NUM>. For example, the tobacco rod <NUM> may be packaged by a first wrapper and the filter rod <NUM> may be packaged by a second wrapper. In addition, the tobacco rod <NUM> and the filter <NUM> are respectively packaged by single wrappers, and then, the cigarette <NUM> may be entirely re-packaged by a third wrapper. When each of the tobacco rod <NUM> and the filter rod <NUM> includes a plurality of segments, each of the segments may be packaged by a single wrapper. In addition, the cigarette <NUM>, in which the segments respectively packaged by the single wrappers are coupled to one another, may be re-packaged by another wrapper.

The tobacco rod <NUM> includes an aerosol generating material. In addition, the tobacco rod <NUM> may include other additive materials like a flavoring agent, a wetting agent, and/or an organic acid. Also, a flavoring liquid such as menthol, humectant, etc. may be added to the tobacco rod <NUM> by being sprayed to the tobacco rod <NUM>.

The tobacco rod <NUM> may be manufactured variously. For example, the tobacco rod <NUM> may be fabricated as a sheet or a strand. Also, the tobacco rod <NUM> may be fabricated by tobacco leaves that are obtained by fine-cutting a tobacco sheet. Also, the tobacco rod <NUM> may be surrounded by a heat conducting material. For example, the heat conducting material surrounding the tobacco rod <NUM> may improve a thermal conductivity applied to the tobacco rod by evenly dispersing the heat transferred to the tobacco rod <NUM>, and thus, improving tobacco taste. Also, the heat conducting material surrounding the tobacco rod <NUM> may function as a susceptor that is heated by an inducting heating-type heater. Although not shown in the drawings, the tobacco rod <NUM> may further include a susceptor, in addition to the heat conducting material surrounding the outside thereof.

The filter rod <NUM> may be a cellulose acetate filter. In addition, the filter rod <NUM> is not limited to a particular shape. For example, the filter rod <NUM> may be a cylinder-type rod or a tube-type rod including a cavity therein. Also, the filter rod <NUM> may be a recess type rod. When the filter rod <NUM> includes a plurality of segments, at least one of the plurality of segments may have a different shape from the others.

The filter rod <NUM> may be manufactured to generate flavor. For example, a flavoring liquid may be sprayed to the filter rod <NUM> or separate fibers on which the flavoring liquid is applied may be inserted in the filter rod <NUM>.

Here, the capsule <NUM> may generate flavor or may generate aerosol. For example, the capsule <NUM> may have a structure, in which a liquid containing a flavoring material is wrapped with a film. The capsule <NUM> may have a circular or cylindrical shape, but is not limited thereto.

When the filter rod <NUM> includes a segment for cooling down the aerosol, the cooling segment may include a polymer material or a biodegradable polymer material. For example, the cooling segment may include pure polylactic acid alone, but the material for forming the cooling segment is not limited thereto. In some embodiments, the cooling segment may include a cellulose acetate filter having a plurality of holes. However, the cooling segment is not limited to the above examples, and may include any material provided that a function of cooling down the aerosol is implemented.

Although not shown in <FIG>, the cigarette <NUM> according to the embodiment may further include a front-end filter. The front-end filter is at a side facing the filter rod <NUM>, in the tobacco rod <NUM>. The front-end filter may prevent the tobacco rod <NUM> from escaping to the outside and may prevent the liquefied aerosol from flowing to the aerosol generator <NUM> (see <FIG>) from the tobacco rod <NUM> during smoking.

<FIG> is a view illustrating another example of a cigarette.

Referring to <FIG>, it can be seen that the cigarette <NUM> has a form in which a cross tube <NUM>, the tobacco rod <NUM>, a tube 220a, and a filter 220b are wrapped by the final wrapper <NUM>. In <FIG>, the wrapper includes individual wrappers that are individually wrapped around the cross tube <NUM>, the tobacco rod <NUM>, the tube 220a, and the filter 220b, and a final wrapper that is collectively wrapped around the cross tube <NUM>, the tobacco rod <NUM>, the tube 220a, and the filter 220b.

The first portion described above with reference to <FIG> and <FIG> includes the cross tube <NUM> and the tobacco rod <NUM>, and the second portion includes the filter rod <NUM>. For the sake of convenient description, the following description will be made with reference to <FIG> and <FIG>, and description overlapping with the description made with reference to <FIG> will be omitted.

The cross tube <NUM> refers to a cross-shaped tube connected to the tobacco rod <NUM>.

The tobacco rod <NUM> includes an aerosol generating substrate that generates an aerosol by being heated by the heater <NUM> of the aerosol generation device <NUM>.

The tube 220a performs a function of transferring an aerosol generated when an aerosol generating substrate of the tobacco rod <NUM> is heated by receiving the sufficient amount of energy from the heater <NUM> to the filter 220b. The tube 220a is manufactured in a manner in which triacetin (TA) which a plasticizer is added to a cellulose acetate tow by more than a certain amount to form a circle, and not only is different in shape but also has a difference in arrangement in that the tobacco rod <NUM> and the filter 220b are connected to each other, as compared with the cross tube <NUM>.

When the aerosol generated by the tobacco rod <NUM> is transferred through the tube 220a, the filter 220b performs a function of allowing a user to puff the aerosol filtered by the filter 220b by passing the aerosol therethrough. The filter 220b may include a cellulose acetate filter manufactured based on a cellulose acetate tow.

The final wrapper <NUM> is paper that is wrapped around the cross tube <NUM>, the tobacco rod <NUM>, the tube 220a, and the filter 220b, and may include all of a cross tube wrapper 240b, a tobacco rod wrapper 240c, a tube wrapper 240d, and a filter wrapper 240e.

In <FIG>, the cross tube wrapper 240b is wrapped by an aluminum wrapper, the tube 220a is wrapped by an MFW or <NUM> wrapper, and the filter 220b is wrapped by an oil-resistant hard wrapper or a lamination of a poly lactic acid (PLA) material. The tobacco rod wrapper 240c and the final wrapper <NUM> will be described in more detail below.

The tobacco rod wrapper 240c is wrapped around the tobacco rod <NUM> and may be coated with a thermal conductivity enhancement material to maximize efficiency of thermal energy transferred by the heater <NUM>. For example, the tobacco rod wrapper 240c may be manufactured in a manner in which a general wrapper or heterotype base paper is coated with at least one of silver foil (Ag), aluminum foil (Al), copper foil (Cu), carbon paper, filler, ceramic (AIN, Al<NUM>O<NUM>), silicon carbide, sodium citrate (Na citrate), potassium citrate (K citrate), aramid fiber, nano cellulose, mineral paper, glassine paper, single-walled carbon nanotube (SWNT). A general wrapper refers to a wrapper applied to widely known cigarettes and refers to a porous wrapper made of a proven material that has both paper manufacturing workability and a thermal conductivity exceeding a certain value through a water paper test.

In addition, in the present disclosure, the final wrapper <NUM> may be manufactured in a manner in which an MFW (a kind of steriled paper) base paper is coated with at least one of filler, ceramic, silicon carbide, sodium citrate, potassium citrate, aramid fiber, nano cellulose, and SWNT among various materials coating the tobacco rod wrapper 240c.

The heater <NUM> included in the externally heated aerosol generation device <NUM> described in <FIG> and <FIG> is a target controlled by the controller <NUM>, and heats the aerosol generating substrate included in the tobacco rod <NUM> to generate an aerosol, and at this time, thermal energy transferred to the tobacco rod <NUM> is composed of a ratio of <NUM>% by radiant heat, <NUM>% by convective heat, and <NUM>% by conductive heat. The ratio between the radiant heat, the convective heat, and the conductive heat constituting the thermal energy transferred to the tobacco rod <NUM> may be different depending on the embodiment.

In the present disclosure, in order to overcome the difficulty in quickly generating an aerosol because thermal energy may not be transferred with the heater <NUM> in direct contact with an aerosol generating substrate, the tobacco rod wrapper 240c and the final wrapper <NUM> are coated with a thermal conductivity enhancement material to prompt an efficient transfer of the thermal energy to the aerosol generating substrate of the tobacco rod <NUM>, and thus, a sufficient amount of aerosol may be provided to a user even during an initial puff before the heater <NUM> is sufficiently heated.

Depending on the embodiment, the tobacco rod wrapper 240c and the final wrapper <NUM> may also be coated with a thermal conductivity enhancement material, and the present disclosure may also be implemented in a manner in which the tobacco rod wrapper 240c or the final wrapper <NUM> is coated with organic metal, inorganic metal, fiber, or polymer material which has a thermal conductivity of a preset value, as well as the above-described examples.

Hereinafter, processes of manufacturing the tobacco rod wrapper 240c and the final wrapper <NUM> according to the present disclosure, and properties of the tobacco rod wrapper 240c and the final wrapper <NUM> manufactured according to the processes will be described.

The tobacco rod wrapper 240c may be manufactured by coating a general wrapper or a heterotype base paper with the above-described thermal conductivity enhancement material and then slitting the coated wrapper or paper. As an example of a method of coating a general wrapper or heterotype base paper with a thermal conductivity enhancement material, a pearl coating method may be used. In addition, as an example of a slitting method, a width of slitting may be <NUM>, and the width of slitting may change depending on the embodiment.

As an example of a method of manufacturing the tobacco rod wrapper 240c, a general wrapper subjected to calendering may be used as a wrapper serving as a base of the tobacco rod wrapper 240c.

Table <NUM> shows an example of physical properties of a general wrapper before being pearl-coated with a thermal conductivity enhancement material. Referring to Table <NUM>, it can be seen that a thickness of a general wrapper not pearl-coated with a thermal conductivity enhancement material is reduced by <NUM>% as compared to a state of base paper and other physical properties are changed after calendaring is performed. The tobacco rod wrapper 240c may be manufactured by a method of pearl coating a calendered general wrapper with a thermal conductivity enhancement material. As an optional embodiment, the tobacco rod wrapper 240c may be manufactured by performing calendering after being coated with a thermal conductivity enhancement material is performed on the basis of any one of a general wrapper, heterotype base paper, and MFW base paper. According to the optional embodiment, in order to increase a thermal energy transfer rate of the cigarette <NUM> to an aerosol generating substrate, a wrapper first coated with a thermal conductivity enhancement material is subjected to calendering, not the wrapper subjected to calendering.

Table <NUM> shows comparison of physical properties before and after various wrappers are coated with potassium citrate which is a thermal conductivity enhancement material. Referring to Table <NUM>, it can be seen that, depending on a material of a wrapper used as a base, tensile strength, smoothness, and stiffness of the tobacco rod wrapper 240c are changed by more than a preset ratio by different coating amount from <NUM>% to <NUM>%. Here, the preset ratio means a ratio value calculated by experimental and mathematical calculations to increase thermal energy transferred to an aerosol generating substrate by a certain value or more.

Table <NUM> shows comparison of physical properties before and after various wrappers are coated with sodium citrate which is a thermal conductivity enhancement material. Referring to Table <NUM>, it can be seen that, depending on a material of a wrapper used as a base, tensile strength, smoothness, and stiffness of the tobacco rod wrapper 240c are changed by more than a preset ratio by applying different coating amounts from <NUM>% to <NUM>%. Here, the preset ratio means a ratio value calculated by experimental and mathematical calculations to increase thermal energy transferred to an aerosol generating substrate by a certain value or more. As shown in Table <NUM> and Table <NUM>, a wrapper coated with potassium citrate or sodium citrate may be manufactured as the tobacco rod wrapper 240c through calendering. In addition, potassium citrate and sodium citrate described through Table <NUM> and Table <NUM> are examples of a thermal conductivity enhancement material, and other thermal conductivity enhancement materials other than the potassium citrate and the sodium citrate may be applied depending on the embodiment.

Table <NUM> shows results of quantifying indicators directly relating to a sense of smoking, such as the amount of atomization and a degree of flavor when an aerosol generation device operates through tobacco to which the tobacco rod wrapper 240c coated with a thermal conductivity enhancement material described through Table <NUM> to Table <NUM> is applied. A thermal conductivity enhancement material is applied only to the tobacco rod wrapper 240c to check how well thermal energy is transferred to an aerosol generating substrate included in a tobacco rod, and a thin paper inner is applied to the final wrapper <NUM>. ln Table <NUM>, a general wrapper (control plot) means a general wrapper to which no thermal conductivity enhancement material is applied, and is an experimental group for confirming effectiveness of the present disclosure. In Table <NUM>, a general wrapper (Na) and a general wrapper (K) are general wrappers respectively coated with sodium citrate and potassium citrate by <NUM>%, and heterotype base paper (Na) and heterotype base paper (K) are heterotype base paper respectively coated with sodium citrate and potassium citrate by <NUM>%. A general wrapper (pearl coating) means an experimental group in which a specific thermal conductivity enhancement material excluding sodium citrate and potassium citrate is applied to a general wrapper in a pearl coating method.

In general, according to Table <NUM>, it can be seen that better results are obtained for the amount of atomization, smoking intensity, and a degree of flavor while there is little difference between an experimental group to which a thermal conductivity enhancement material is applied and heat sensation of oral region compared to a general wrapper (control plot), and respective results are relatively calculated results by using a maximum of <NUM> points as a reference score. As described above, according to the present disclosure, a user who uses an externally heated aerosol generation device may be provided with the abundant amount of atomization and a satisfactory smoking impression by applying a thermal conductivity enhancement material to the tobacco rod wrapper 240c to increase a transfer rate of thermal energy of the heater <NUM> which is supplied to an aerosol generating substrate.

The result according to Table <NUM> is a result of applying the thermal conductivity enhancement material only to the tobacco rod wrapper 240c, and according to the embodiments, the thermal conductivity enhancement material may also be applied only to the final wrapper <NUM>.

Table <NUM> shows a numerical increase in smoking impression felt by a user and in the amount of atomization of an aerosol generated by an aerosol generation device when a thermal conductivity enhancement material is applied only to the final wrapper <NUM>. In Table <NUM>, the thermal conductivity enhancement material is applied only to the final wrapper <NUM>, and a general porous wrapper is used as the tobacco rod wrapper 240c to check how well thermal energy is transferred to an aerosol generating substrate included in a tobacco rod. In Table <NUM>, MFW (control plot) means MFW base paper to which no thermal conductivity enhancement material is applied, and is a comparative experimental group for confirming effectiveness of the present disclosure. In Table <NUM>, MFW (Na) and MFW (K) means MFW base paper respectively coated with sodium citrate and potassium citrate by <NUM>%.

According to Table <NUM>, it can be seen that higher result values are obtained for the amount of atomization, smoking intensity, and a degree of flavor while the final wrapper <NUM> to which a thermal conductivity enhancement material is applied has little difference in heat sensation of oral region with a control plot to which the thermal conductivity enhancement material is not applied, Table <NUM> shows results relatively calculated by using a maximum of <NUM> points as a reference score as shown in Table <NUM>. As described above, according to the present disclosure, a user who uses an externally heated aerosol generation device may be provided with the abundant amount of atomization and a satisfactory smoking impression by applying a thermal conductivity enhancement material to the final wrapper <NUM> to increase a transfer rate of thermal energy of the heater <NUM> which is supplied to an aerosol generating substrate.

In the present disclosure, it is obvious not only that a thermal conductivity enhancement material may be applied to both, the tobacco rod wrapper 240c and the final wrapper <NUM>, and a process of coating (pearl coating) base paper (general wrapper, heterotype base paper, MFW base paper) which becomes a base with the thermal conductivity enhancement material follows the above-described method.

As an optional embodiment, a thermal conductivity enhancement material may also be applied to the tobacco rod wrapper 240c and the final wrapper <NUM> through an internal addition method instead of a coating method. Among thermal conductivity enhancement materials, metal such as aluminum, copper, or iron, calcium carbonate, aluminum nitrate, and silicon carbide are internally added during a process of manufacturing the tobacco rod wrapper 240c and the final wrapper <NUM>, and thus, thermal energy from the heater <NUM> may be better transferred to an aerosol generating substrate.

The present disclosure provides a cigarette in which an aerosol is generated from an aerosol generating substrate included in a tobacco rod (medium portion) through external heating, and an externally heated aerosol generation device for using the cigarette, wherein the cigarette includes a tobacco rod wrapper that is wrapped around a tobacco rod and a final wrapper that is collectively wrapped around the tobacco rod wrapped by the tobacco rod wrapper and elements (a cross tube, a (circular) tube, and a filter) other than the tobacco rod, and the tobacco rod wrapper and the final wrapper are manufactured by a method of coating or internally adding a thermal conductivity enhancement material such as metal, filler, and fiber.

When a user smokes through the externally heated aerosol generation device according to the present disclosure, there is an effect of transferring sufficient thermal energy of a heater to an aerosol generating substrate, and thus, the user may have more satisfactory smoking experience than when smoking using an externally heated aerosol generation device known in the past.

In the specification (especially in the claims) of the present disclosure, use of terms "above-described" or "described above" and used of a designating term similar thereto may correspond to both the singular and the plural. In addition, when a range is described in the present disclosure, the disclosure includes an invention to which an individual value involved in the range is applied (unless otherwise stated), and is the same that each individual value constituting the range is described in the detailed description of the disclosure. Finally, if there is no explicit or contradictory description on a sequence of steps constituting the method according to the present disclosure, the steps may be performed in a suitable sequence. The present disclosure is not limited to the description sequence of the steps. Use of all examples or illustrative terms (for example, etc., and so on) in the present disclosure is merely for describing the present disclosure in detail, and the scope of the present disclosure is not limited by the above-described examples or illustrative terms, unless limited by the claims. In addition, those skilled in the art will recognize that various modifications, combinations, and changes may be configured according to design conditions and factors within the scope of the appended claims.

Claim 1:
A system comprising an externally heated aerosol generation device (<NUM>) and a cigarette (<NUM>),
wherein the cigarette is capable of generating an aerosol from an aerosol generating substrate included in a medium portion through external heating,
and wherein the cigarette (<NUM>) comprises:
- a medium portion wrapper (240c) that is wrapped around the medium portion; and
- a final wrapper (<NUM>) that is collectively wrapped around the medium portion wrapped by the medium portion wrapper (240c) and cigarette elements other than the medium portion,
wherein the medium portion wrapper (240c) and the final wrapper (<NUM>) comprise a thermal conductivity enhancement material coating or an internally added thermal conductivity enhancement material.