RU2772252C1 - Aerosol-forming component for a tobacco heating apparatus and mouthpiece thereof - Google Patents

Abstract

FIELD: smoking devices.

SUBSTANCE: invention relates to an aerosol-generating component for a tobacco heating apparatus, a mouthpiece therefor, and to methods for manufacturing an aerosol-generating component and a mouthpiece. An aerosol-forming component for a tobacco heating apparatus containing an aerosol-forming material; a mouthpiece located downstream of the aerosol-forming material; a connecting wrapper connecting the mouthpiece with the aerosol-forming material; a first wrapper containing a first sheet material and surrounding at least part of the aerosol-forming material, directly in contact therewith; and a second wrapper containing a second sheet material and surrounding at least part of the mouthpiece, wherein the heat conductivity of the first sheet material is greater than the heat conductivity of the second sheet material.

EFFECT: configuration of the components according to the invention can ensure great heat transfer to the rod of the aerosol-forming material, facilitating the formation of aerosol and simultaneously reducing the heat transfer through one or both second wrappers, thereby reducing the temperature of the components brought into contact with the mouth or fingers of the user.

8 cl, 5 dwg, 2 tbl

Description

The field of technology to which the invention belongs

The invention relates to an aerosol generating component for a tobacco heating device, a mouthpiece for it, and to methods for manufacturing an aerosol generating component and a mouthpiece.

State of the art

Some tobacco industry products release an aerosol when used, which is inhaled by the user. For example, smoking articles such as cigarettes burn tobacco during use to create tobacco smoke. Tobacco heating devices heat an aerosol-forming material such as tobacco to form an aerosol by heating the material without burning it. Such products from the tobacco industry typically include mouthpieces through which the aerosol passes into the user's mouth.

Disclosure of invention

The first object of the invention is an aerosol-forming component for a tobacco heating device, containing an aerosol-forming material; a mouthpiece located downstream of the aerosol-forming material; a first wrapper containing a first sheet material and surrounding at least a portion of the aerosol-forming material; and a second wrapper comprising a second sheet material and surrounding at least a portion of the mouthpiece, wherein the thermal conductivity of the first sheet material is greater than that of the second sheet material.

The thermal conductivity of the first sheet material may exceed 0.06 W·m ^-1 ·K ^-1 .

The thermal conductivity of the second sheet material may be less than 0.06 W·m ^-1 ·K ^-1 .

The density of the first sheet material may be greater than the density of the second sheet material.

The thickness of the second wrap may be greater than the thickness of the first wrap.

The second object of the invention is an aerosol-forming component mouthpiece for a tobacco heating device, containing one or more wrappers, at least one of the wrappers contains a sheet material with a density of from 0.2 to 0.45 g/cm ³ .

At least one of the wrappers may contain sheet material with a density of from 0.30 to 0.45 g/cm ³ .

The thickness of one or each wrapper may be from 20 to 100 microns. The thickness of one or each wrapper may be from 30 to 70 microns.

The mouthpiece may contain several wrappers, at least one of which contains a porous material.

The mouthpiece may include a housing of filter material, wherein at least one of the wrappers partially surrounds this housing and contains material with a density of 0.2 to 0.45 g/cm ³ .

The mouthpiece may further comprise a flavor modifying agent located within the filter material housing.

The aroma modifying additive may be contained in a brittle capsule.

The mouthpiece may include ventilation holes provided in the wraps.

A third aspect of the invention is an aerosol-forming component for a tobacco heating device, comprising the mouthpiece described above.

Such an aerosol-forming component may further comprise an aerosol-forming material. The aerosol-forming material may contain tobacco material.

Such an aerosol forming component may have a substantially cylindrical shape with a circumference of 16 to 19 mm.

A fourth aspect of the invention is a method for manufacturing an aerosol-forming component for a tobacco heating device, comprising: wrapping the aerosol-forming material with a first sheet wrapper such that the first sheet wrapper surrounds at least a portion of the aerosol-forming material; placing the mouthpiece downstream of the aerosol-forming material; and wrapping the mouthpiece with the second sheet wrapper so that the second sheet wrapper surrounds at least a portion of the mouthpiece, wherein the thermal conductivity of the thickness of the first sheet wrapper is higher than the thermal conductivity of the second sheet wrapper.

The fifth object of the invention is a method for manufacturing the mouthpiece described above, which includes the steps of taking a body of filter material and wrapping it with a sheet material with a density of from 0.2 to 0.45 g/cm ³ .

The invention is illustrated by drawings.

Brief description of the drawings

In FIG. 1 shows a tobacco industry product including a mouthpiece, a sectional side view;

in fig. 2 - another product of the tobacco industry, including a mouthpiece, side view in section;

in fig. 3 is a cross section of the mouthpiece shown in FIG. 2;

in fig. 4 is a flow diagram of a method for manufacturing an aerosol generating component for a tobacco heating device;

in fig. 5 is a block diagram of a method for manufacturing a mouthpiece.

Implementation of the invention

The term "product of the tobacco industry" means smoking products, including combustible smoking products and their components, such as cigarettes, cigarillos, cigars, pipe tobacco or cigarettes that you can roll yourself (based on tobacco, tobacco derivatives, exploded tobacco, reconstituted tobacco, tobacco substitutes or other smoking material), electronic smoking products and their components, such as electronic cigarettes, heating devices that release compounds from substrate materials without combustion (where the substrate material may be tobacco, tobacco derivatives, exploded tobacco, reconstituted tobacco, tobacco substitutes or other smoking material) and components thereof, such as tobacco heating products and components of tobacco heating products, including aerosol generating components and mouthpieces for such components, as well as hybrid systems for generating aerosol from a combination of substrate materials, e.g. hybrid systems containing liquid or gel or solid substrate; and aerosol-free nicotine delivery products and components thereof, such as products containing respirable powders. Components of the aforementioned articles include consumable smoking article components, mouthpieces, filter assemblies, filter plugs, filter inserts, and tubes for use in products such as smoking articles.

The products of the tobacco industry described herein may be consumable components for use with heating devices, such as aerosol generating components for a tobacco heating device. Alternatively, tobacco industry products as described herein may be combustible smoking products such as cigarettes, cigarillos, and cigars.

Products of the tobacco industry, such as consumables and smoking articles, are often referred to as “regular” (usually in the range of 68-75 mm, e.g., about 68 to 72 mm), “short” or “mini” according to the length of the product (68 mm or smaller), "large size" (typically in the range of 75-91 mm, for example, about 79 to 88 mm), "long" or "extra large" (typically in the range of 91-105 mm, for example, from about 94 to 101 mm) and "extra long" (usually in the range of about 110 to 121 mm).

They are also called, depending on the circumference of the product, "regular" (about 23-25 mm), "wide" (more than 25 mm), "thin" (about 22-23 mm), "semi-thin" (about 19-2 mm), "super thin" (approximately 16-19 mm) and "micro thin" (approximately less than 16 mm).

Accordingly, a large size ultra-thin cigarette would, for example, have a length of about 83 mm and a circumference of about 17 mm. Many buyers prefer regular format cigarettes of large size, namely, with a circumference of 23 to 25 mm and an overall length of 75 to 91 mm.

Each format can be made with mouthpieces of various lengths, with smaller mouthpieces typically being used in formats with smaller lengths and circumferences. Typically, the length of the mouthpiece ranges from about 15 mm for the short regular formats to 30 mm for the extra long extra thin formats. The rim paper should be longer than the mouthpiece, eg 3-10 mm longer, so that the rim paper covers the mouthpiece and overlaps the tobacco rod to connect the mouthpiece to the tobacco rod.

Products of the tobacco industry, including smoking articles and their components, aerosol generating components, and mouthpieces can be made in any of the above formats, but are not limited to them.

Used in the description, the terms "before" and "after" are relative terms, defined in relation to the direction of the main stream of aerosol (eg, smoke) drawn through the used product or component of the tobacco industry.

The filter material may comprise a tow of cellulose acetate fibers. The filter material can also be formed using other materials used to form fibers such as polyvinyl alcohol (PVOH), polylactic acid (PLA), polycaprolactone (PCL), poly(1-4 butanediol succinate) (PBS), poly(butylene adipate coterephthalate) (PBAT), starch-based materials, paper, cotton, aliphatic polyester materials and polysaccharide polymers, or a combination thereof. The filter material may be plasticized using a suitable filter material plasticizer, such as triacetin, where the filter material is cellulose acetate tow, or may be unplasticized. The tow may be of any suitable size, such as fibers, may have a Y-shape or other cross-section, denier for threads from 2.5 to 15 denier per thread, for example from 8.0 to 11.0 denier per thread, and total denier values from 5000 to 50000, for example from 10000 to 20000.

The term "tobacco material" refers to any material containing tobacco or its derivatives or substitutes. "Tobacco material" may include one or more of the following: tobacco, tobacco derivatives, exploded tobacco, reconstituted tobacco, or tobacco substitutes. The tobacco material may also contain ground tobacco, tobacco fiber, shredded tobacco, blasted tobacco, tobacco stem, reconstituted tobacco, and/or tobacco extract.

The terms “flavour” and “flavoring agent” refer to materials that, if permitted by local law, may be used to create a desired flavor or aroma in a product for adult consumers. They may include extracts (eg, licorice, hydrangea, white-barked Japanese magnolia leaves, chamomile, fenugreek, clove, menthol, Japanese mint, anise, cinnamon, herb, wintergreen, cherry, berry, peach, apple, drambuie, bourbon , scotch, whiskey, mint, peppermint, lavender, cardamom, celery, cascarilla, nutmeg, sandalwood, bergamot, geranium, honey essence, rose oil, vanilla, lemon oil, orange oil, cassia, cumin, cognac, jasmine, ylang -ylang, sage, fennel, pimento, ginger, anise, coriander, coffee or peppermint oils of any species of the genus Mentha), flavor enhancers, bitterness receptor blockers, sensory receptor activators or stimulants, sugars and/or sugar substitutes (e.g. sucralose, acesulfame potassium, aspartame, saccharin, cyclamates, lactose, sucrose, glucose, fructose, sorbitol or mannitol), as well as other additives or substances such as charcoal, chlorophyll, minerals, herbal or breath freshening agents. They may be artificial, synthetic or natural ingredients or mixtures thereof. They may be in any suitable form, such as an oil, liquid or powder.

In the figures, like reference numerals are used to refer to similar features, articles, or components.

In FIG. 1 shows a product from the tobacco industry, in this case a consumable component 100, for use with a heating device.

Consumable component 100 includes a mouthpiece 10 and a cylindrical rod of aerosol forming material 50, in this case tobacco, connected to the mouthpiece 10. In this example, the outer circumference of the consumable component 100 is about 17 mm (ie, ultra-fine format).

In other examples, the product of the tobacco industry may be a smoking article, such as a cigarette, in any of the formats described above. In such examples, the mouthpiece may include a filter to filter the smoke produced by the smoking article.

The aerosol forming material rod 50 is wrapped in the first wrap 60 such that the first wrap 60 surrounds the side surface of the aerosol forming material rod 50. In this case, the first wrapper 60 is made of paper. The first wrap 60 directly contacts the rod of aerosol forming material 50. The first wrap 60 in this example has a density of 0.60 g/cm ³ and is formed from a 40 µm thick material with a density of 24 g/m ² . In alternative examples, the first wrap 60 may have a density in the range of 0.5 to 1.0 g/cm ³ , such as 0.50 to 0.70 g/cm ³ . The length of the rod of aerosol forming material 50 is 42 mm, although it can be any length from 20 to 80 mm, such as 30 to 60 mm or 35 to 55 mm. A connector wrap 70, in this case made of paper, covers the first wrap 60 and connects the mouthpiece 10 to the rod of aerosol forming material 50.

The consumable component 10 comprises one or more second wrappers, in this case an inner wrap 15a and an outer wrap 15b, each of which at least partially surrounds the mouthpiece 10. Both the inner wrap 15a and the outer wrap 15b are formed from a sheet material, in this case paper . In this example, the density of the outer second wrap 15b is 0.38 g/cm ³ . The outer second wrap 15b has a thickness of 60 µm and a density of 23 g/m ² . At least the inner or outer second wrapper 15a, 15b may contain sheet material with a density of 0.2 to 0.45 g/cm ³ . The density of the sheet material forming the inner or outer second wrapper 15a, 15b may be 0.30 to 0.45 g/cm ³ or 0.35 to 0.45 g/cm ³ .

The sheet material forming the first wrap 60 has a higher thermal conductivity than the sheet material forming one or each of the second wraps 15a, 15b. This can be achieved by selecting suitable density values for the first and second wraps 60, 15a, 15b. The thermal conductivity of the sheet material forming the first wrap 60 is 0.07 W·m ^-1 ·K ^-1 . In other examples, the thermal conductivity of the sheet material forming the first wrap 60 may be greater than 0.06 W·m ^-1 ·K ^-1 . The thermal conductivity of the sheet material forming the first wrap 60 may, for example, be from 0.06 to 1.2 W m ^-1 K ^-1 , for example from 0.08 to 1.1 W m ^-1 K ^-1 . The specified thermal conductivity values refer to the materials forming the respective sheet wrappers, regardless of their thickness.

The thermal conductivity of the sheet material forming the outer second wrap 15b is 0.04 W·m ^-1 ·K ^-1 , and the thermal conductivity of the sheet material forming the inner second wrap 15a is 0.07 W·m ^-1 ·K ^-1 . In other examples, the thermal conductivity of the sheet material forming one or both of the inner and outer second wraps 15a, 15b is less than 0.06 Wm ^-1 K ^-1 , such as 0.02 to 0.06 Wm ^{- 1} K ^-1 .

The thermal conductivity can be measured in a known manner, for example using a Model C-2500-HTS Thermal Conductivity Measurement System from International Thermal Instrument Company Inc., Del Mar, CA, USA. Device calibration and test performance are in accordance with the current ASTM C177 standard.

Although the mouthpiece 10 is described as having two second wraps 15a, 15b in the present example, the number of second wraps is not limited to this. The mouthpiece 10 may include three or more second wraps, or alternatively may include one second wrap, whether it be an inner second wrap 15a or an outer second wrap 15b. If there are three second wraps, an additional middle wrap may be located between the inner and outer second wraps 15a, 15b. The outermost of the three second wraps 15b may have at least the low density and/or thermal conductivity characteristics given above.

Alternatively, the connecting wrap 70 may be a second wrap or one of several second wraps. In particular, the density of the material forming the connecting wrap 70 may be 0.38 g/cm ³ . The connecting wrap 70 may have a thickness of about 60 microns and a density of about 23 g/m ² . Alternatively, the density of the material forming the connecting wrap 70 may be from 0.2 to 0.45 g/cm ³ , for example, from 0.30 to 0.45 g/cm ³ or from 0.35 to 0.45 g/ ^cm3 . The thermal conductivity of the sheet material forming the connecting wrap 70 may be 0.04 W·m ^-1 ·K ^-1 . In other examples, the thermal conductivity of the connecting wrap 70 may be less than 0.06 W·m ^-1 ·K ^-1 , for example, from 0.02 to 0.06 W·m ^-1 ·K ^-1 .

In use, the component 100 may be inserted into a heating device (not shown) such that at least a portion of the mouthpiece 10 protrudes from the heating device and can be inserted into the user's mouth. The aerosol is obtained by heating the aerosol-forming material 50 using a heating device. The aerosol produced by the aerosol-forming material 50 passes through the mouthpiece 10 to the user's mouth.

Because the sheet material forming the first wrap 60 has a higher thermal conductivity than the sheet material forming one or both of the second wraps 15a, 15b, heat transfer into, out of, and within component 100 can be improved compared to component designs in which the first and the second wrapper have the same thermal conductivity. The arrangement of the components according to the invention results in more heat passing through each unit of thickness of the first wrap 60 and into the aerosol-forming material 50 than through each unit of thickness of the second wrap(s) at least partially surrounding the mouthpiece 10. Such an arrangement, when used, can provide good heat transfer to the aerosol forming material rod 50, facilitating aerosol generation while reducing heat transfer through one or both of the second wraps 15a, 15b, which reduces the temperature of the components that come into contact with the user's mouth or fingers.

One or both of the second wraps 15a, 15b may be thicker than the first wrap 60. For example, one or both of the second wraps 15a, 15b may be 42 to 80 microns thick, such as 42 to 70 microns or 50 to 70 microns. The thickness of the first wrap 60 may be 20 to 50 microns, such as 30 to 45 microns.

Alternatively or additionally, the density of the sheet material forming the first wrap 60 may be higher than the density of the sheet material forming one or both of the second wraps 15a, 15b. It also allows greater heat transfer through the first wrap 60 compared to heat transfer through one or both of the second wraps 15a, 15b.

For example, the implementation of the second wrap containing sheet material with a density of from 0.2 to 0.45 g/cm ³ provides reduced heat transfer through this wrap. The sheet material forming the first wrap 60 may have a density of 0.50 to 0.70 g/cm ³ .

In some examples, the thickness of one or both of the second wraps 15a, 15b may be 20 to 100 microns, or 30 to 70 microns. For example, one or each of the second wraps 15a, 15b may have a thickness of approximately 60 microns. For example, the second outer wrap may have a thickness of approximately 60 microns. The second inner wrap may have a thickness of approximately 40 microns.

One or both of the second wraps 15a, 15b (or one second wrap) may contain porous sheet material. Porous material in this context means a material having a permeability of more than 200 Coresta units. The permeability of the porous sheet material of the second wrapper(s) may be greater than 500, 1000, 1500 or 2000 Coresta Units (CU). The porous sheet material of the second wrapper(s) may have a permeability of 2000 to 8000 CU. The porous sheet material of the second wrapper(s) preferably has a porosity greater than 2500 CU. Paper can be used as such a sheet material. Alternatively, one or both of the second wraps 15a, 15b (or one second wrap) may contain non-porous sheet material with a permeability of less than 200 CU. In this case, a barrier coating or similar material modification may be used to provide the correct level of permeability, eg while maintaining the desired density and/or thermal conductivity.

The first wrap 60 may contain non-porous sheet material. Non-porous material in this context means a material having a permeability of less than 200 CU. The non-porous first wrap sheet may have a permeability of less than 150, 125, or 100 CU. The permeability of the first wrapper sheet material may, for example, be 75 CU.

Tables 1 and 2 below provide various examples of wrapper configurations that can be used in consumables according to the invention, as well as the corresponding density (table 1) and thermal conductivity (table 2) wrappers.

Table 1

Density Example First wrap Inner second wrap Medium (optional) second wrap Outer second wrap Connecting wrap one 0.60 g/ ^cm3 0.65 g/ ^cm3 0.58 g/ ^cm3 0.38 g/ ^cm3 0.70 g/ ^cm3 2 0.60 g/ ^cm3 0.65 g/ ^cm3 0.58 g/ ^cm3 0.58 g/ ^cm3 0.38 g/ ^cm3 3 0.60 g/ ^cm3 0.65 g/ ^cm3 No 0.38 g/ ^cm3 0.70 g/ ^cm3 4 0.60 g/ ^cm3 0.38 g/ ^cm3 No 0.58 g/ ^cm3 0.70 g/ ^cm3 5 0.60 g/ ^cm3 0.65 g/ ^cm3 No 0.65 g/ ^cm3 0.38 g/ ^cm3

table 2

Thermal conductivity Example First wrap Inner second wrap Medium (optional) second wrap Outer second wrap Connecting wrap 6 0.06 W m ^-1 K ^-1 0.07 W m ^-1 K ^-1 0.06 W m ^-1 K ^-1 0.04 W m ^-1 K ^-1 0.08 W m ^-1 K ^-1 7 0.06 W m ^-1 K ^-1 0.07 W m ^-1 K ^-1 0.06 W m ^-1 K ^-1 0.06 W m ^-1 K ^-1 0.04 W m ^-1 K ^-1 eight 0.06 W m ^-1 K ^-1 0.07 W m ^-1 K ^-1 No 0.04 W m ^-1 K ^-1 0.08 W m ^-1 K ^-1 nine 0.06 W m ^-1 K ^-1 0.04 W m ^-1 K ^-1 No 0.06 W m ^-1 K ^-1 0.08 W m ^-1 K ^-1 ten 0.06 W m ^-1 K ^-1 0.07 W m ^-1 K ^-1 No 0.07 W m ^-1 K ^-1 0.04 W m ^-1 K ^-1

The mouthpiece 10 also includes a cylindrical body of filter material 12, in this example a tow of cellulose acetate. The length of the filter material housing 12 may be approximately 8 to 14 mm. In this example, the filter material housing 12 has a length of 10 mm. The tow has a denier per thread (d.p.f.) of 9.5 and a total denier of 12,000. The second wraps 15a, 15b partially surround the filter material housing 12.

The mouthpiece 10 also includes a first tubular segment 16 and a second tubular segment 17. The first tubular segment 16 is located in front of the filter material housing 12, and the second tubular segment 17 is located after the filter material housing 12. The second tubular segment 17 forms a recess at the end of the mouthpiece 10. The outer second wrap 15b connects the inner second wrap 15a to the first and second tubular segments 16 and 17. In this example, the first tubular segment 16 is 25 mm long and the second tubular segment 17 is 6 mm long. mm. In other examples, one or both tubular segments may be missing.

In the present example, the first and second tubular segments 16, 17 are formed from one or more layers of rigid paper. In other examples, one or both of the tubular segments may be made from a filter material such as cellulose acetate.

In this example, the rim material 70, the outer second wrap 15b, and the first tubular segment 16 are provided with vents (not shown) to ventilate the mouthpiece 10 in front of the filter material housing 12. Ventilation holes can be formed in the above components by laser or mechanical perforation.

The vents may be located at a distance of about 17 to 25 mm from the mouthpiece of the consumable component 100. In the present example, the vents are located approximately 18 mm from the mouthpiece of the consumable 100. In other examples, the vents may be formed in the rim material 70, in the outer second wrapper 15b and the second tubular segment 17 to allow ventilation of the mouthpiece after the filter material housing 12.

In FIG. 2 shows another product from the tobacco industry, which is a modified consumable component 100' which is essentially the same as the consumable component 100 of FIG. 1. The differences will be described below.

The modified consumable component 100' includes a mouthpiece 10' which contains a flavor modifying additive housed in a filter material housing 12. In this example, the flavor modifying additive is contained in a frangible capsule 20. In other examples, the flavor modifying additive may be in the form of a thread carrying flavor, or another aerosol modifying agent may be located within the filter material housing 12.

In this example, one capsule 20 is used. The capsule 20 is completely embedded in the filter material 12. In other words, the capsule 20 is completely surrounded by the filter material 12. In other examples, several fragile capsules may be located inside the filter material 12, for example 2, 3 or more. If multiple capsules are used, the individual capsules may be the same or may differ from each other in terms of size and/or useful capacity of the capsule.

Capsule 20 has a core-shell structure. In other words, the capsule 20 contains a shell containing a liquid flavor, which may be any of those described. The capsule shell may be ruptured by the user to release the flavor into the filter material 12. Making at least one of the second wraps 15a, 15b non-porous may prevent liquid flavor from flowing through the wrapper when the capsule 20 is ruptured. For example, the inner second wrap 15a may include a barrier coating. to render the material substantially impervious to liquid flavor. Alternatively or in addition, the outer barrier cover may include a second wrap 15b to render the material substantially impervious to liquid flavor.

During use, the user may remove the consumable from the heating device to break the capsule 20. The use of the second lower thermal conductivity wrap 15a, 15b as described above reduces the thermal effect on the user when gripping the wrap to remove the consumable and break the capsule 20.

Making the second wrap around the mouthpiece in the density ranges above also provides a softer surface that the user must press on to break the capsule.

In the present example, the capsule 20 has a spherical shape with a diameter of about 3 mm. In other examples, capsules of other shapes and sizes may be used. The total weight of the capsule may be in the range of about 10 to 50 mg.

In this example, the capsule 20 is located in a longitudinal central position within the filter material housing 12, i. e. the capsule 20 is positioned so that its center is 5 mm from each end of the filter material housing 12. In other examples, the capsule 20 may be located in a position other than the longitudinal center position in the filter material housing, i. closer to the downstream end of the filter material housing than its upstream end, or closer to the upstream end of the filter material housing than its downstream end. Preferably, the mouthpiece 10' is designed so that the capsule 20 and the vent holes in the mouthpiece 10' are offset relative to each other in the longitudinal direction.

In FIG. 3 shows a cross section of the mouthpiece 10'. This figure shows the capsule 20, the filter material housing 12 and the wrappers 15a, 15b. In this example, the capsule 20 is centered about the longitudinal axis (not shown) of the mouthpiece 10'. The wrappers 15a, 15b are arranged concentrically around the cylindrical body 12 of the filter material.

In the examples described above, the filter material housing is located closer to the mouthpiece of the consumable component. Alternatively, or in addition, a filter media housing may be located at the opposite (far) end of the consumable.

In the examples described above, the mouthpiece is a single housing of filter material. In other examples, the mouthpiece may include multiple housings of filter material. The mouthpiece may include a cavity between the housings of the filter material.

The method for manufacturing the aerosol forming component shown in FIG. 4 includes the steps of: wrapping the aerosol-forming material with a first sheet wrapper so that the first sheet wrapper surrounds at least a portion of the aerosol-forming material (S101); placing the mouthpiece downstream of the aerosol-forming material (S102); and wrapping the mouthpiece with the second sheet wrapper so that the second sheet wrapper surrounds at least a portion of the mouthpiece, wherein the thermal conductivity of the first sheet wrapper is higher than that of the second sheet wrapper (S103). Alternatively, steps S102 and S103 may be performed in reverse so that the mouthpiece is wrapped with a second sheet wrapper prior to placement downstream of the aerosol forming materials.

The mouthpiece manufacturing method shown in FIG. 5 includes taking the filter material body (S201); and wrap it with sheet material with a density of from 0.2 to 0.45 g/cm ³ (S202).

Various embodiments of the invention have been described above, whereby the invention can be practiced and high quality aerosol forming components can be provided. The features and advantages of embodiments of the invention are presented by way of example only and are not exhaustive and/or exclusive. They are intended only to facilitate understanding of the invention. It should be understood that the advantages, embodiments, examples, functions, features, structures, and/or other aspects of the invention should not be construed as limiting the invention, which is defined by its claims, and that other embodiments of the invention and its modifications can be used and carried out without deviations from the scope of the invention. Various embodiments of the invention may appropriately include, consist of various combinations of the described elements, components, features, parts, steps, means, etc.

Claims (12)

1. An aerosol-forming component for a tobacco heating device, containing an aerosol-forming material; a mouthpiece located downstream of the aerosol-forming material; a connector wrap connecting the mouthpiece to the aerosol-forming material; a first wrapper containing the first sheet material and surrounding at least a portion of the aerosol-forming material and in direct contact with it; and a second wrapper comprising a second sheet material and surrounding at least a portion of the mouthpiece, wherein the thermal conductivity of the first sheet material is greater than that of the second sheet material. 2. Aerosol-forming component according to claim 1, wherein the thermal conductivity of the first sheet material is greater than 0.06 W·m ^-1 ·K ^-1 . 3. Aerosol-forming component according to claim 1, wherein the thermal conductivity of the second sheet material is less than 0.06 W·m ^-1 ·K ^-1 . 4. Aerosol-forming component according to any one of paragraphs. 1-3, in which the density of the first sheet material is greater than the density of the second sheet material. 5. Aerosol-forming component according to any one of paragraphs. 1-4, in which the thickness of the second wrap is greater than the thickness of the first wrap. 6. Aerosol-forming component according to any one of paragraphs. 1-5, wherein the aerosol forming material comprises tobacco material. 7. Aerosol-forming component according to any one of paragraphs. 1-5 having a substantially cylindrical shape with a circumference of 16 to 19 mm. 8. A method for manufacturing an aerosol-forming component for a tobacco heating device, which includes the steps of: wrapping the aerosol-forming material with a first sheet wrapper such that the first sheet wrapper surrounds at least a portion of the aerosol-forming material and directly contacts it; placing the mouthpiece downstream of the aerosol-forming material; provide a connector wrap connecting the mouthpiece to the aerosol-forming material, and wrapping the mouthpiece with the second sheet wrapper so that the second sheet wrapper surrounds at least a part of the mouthpiece, wherein the thermal conductivity of the thickness of the first sheet wrapper is higher than the thermal conductivity of the second sheet wrapper.

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