Tobacco substances containing flavor substances and method for producing the same

Abstract

The present disclosure relates to a tobacco substance comprising a flavoring material and a method for producing the same, the tobacco substance having a core-shell structure in which a core comprises a first tobacco particle and a first flavoring material surrounded by a shell comprising a second tobacco particle, the core comprising a first tobacco particle and a first flavoring material, and an aerosol-generating article comprising the tobacco substance can generate a distinctive flavor.

Description

Technical Field

[0001] The present disclosure relates to a tobacco substance containing a flavoring substance and a method for producing the same.

Background Art

[0002] Recently, the demand for alternatives to traditional tobacco has been increasing. For example, there is an increasing demand for an aerosol generating device in which an aerosol generating substance (for example, a tobacco substance) in an aerosol generating article that does not generate an aerosol by burning an aerosol generating article (for example, a cigarette) is heated to generate an aerosol.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The problem to be solved by the present disclosure is to provide a tobacco substance containing a flavoring substance and a method for producing the same.

[0004] The technical problems to be solved by the present disclosure are not limited to the above technical problems, and other technical problems can be inferred from the following examples.

Means for Solving the Problems

[0005] A tobacco substance according to an embodiment of the present disclosure for solving the above technical problem includes a core containing a first tobacco mixture and a shell formed around the core and containing a second tobacco mixture, the first tobacco mixture containing first tobacco particles and a first flavoring substance, and the second tobacco mixture containing second tobacco particles.

[0006] A method for producing a tobacco substance according to an embodiment of the present disclosure includes a first step of growing a first composition to form a core and a second step of forming a shell surrounding the core.

Effects of the Invention

[0007] According to an embodiment of the present disclosure, the tobacco substance can effectively retain the fragrance and continuously provide the fragrance to the user until the end of smoking.

[0008] Also, according to the manufacturing method of the embodiment, the tobacco substance can be manufactured through relatively simple processes, and the manufacturing yield can be improved.

[0009] The effects of the present disclosure are not limited to those described above, and may include any effects that can be inferred from the configurations described below.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2A

Figure 2B

Figure 3A

Figure 3B

Figure 3C

Figure 3D

Figure 4

Figure 5A

Figure 5B

Modes for Carrying Out the Invention

[0011] According to one aspect of the present disclosure, the tobacco material according to the embodiment includes a core containing a first tobacco mixture, and a shell formed around the core and containing a second tobacco mixture. The first tobacco mixture includes first tobacco particles and a first flavoring substance, and the second tobacco mixture includes second tobacco particles.

[0012] The tobacco material contains 5.0 to 8.0 parts by weight of moisture based on 100 parts by weight of the whole tobacco material.

[0013] The second tobacco mixture further includes a second flavoring substance.

[0014] The first tobacco mixture contains the first flavoring substance in an amount of 20 parts by weight or less based on 100 parts by weight of the first tobacco mixture.

[0015] The core has a diameter of 0.1 to 0.5 mm, and the shell has a diameter of 0.4 to 1.2 mm.

[0016] The tobacco material has a viscosity of 5 to 200 cp.

[0017] The tobacco material has a surface roughness (Ra) of 0.1 to 10.0.

[0018] According to one aspect of the present disclosure, a smoking article according to the embodiment includes a tobacco rod containing the tobacco material of the above-described embodiment, and a filter segment.

[0019] According to one aspect of the present disclosure, a method for manufacturing a tobacco material according to the embodiment includes a first step of growing a first composition to form a core, a second step of forming a shell surrounding the core, and a third step of adding a second flavoring substance to the surface of the formed shell.

[0020] The first step includes a step of introducing the first composition into a chamber, and a step of growing the first composition under a temperature of 30°C to 60°C and a wind pressure condition of 1.5 bar or less.

[0021] The second stage includes positioning the core in the chamber, introducing the second composition into the chamber, and growing the second composition around the core under temperature conditions of about 50°C to 90°C and a wind pressure condition of about 1.5 bar or less.

[0022] The first composition contains 0.1 to 20% by volume of a first flavoring substance.

[0023] The terms used in the examples are, as much as possible, general terms that are currently widely used while considering the functions in the present disclosure. However, this may also vary depending on the intentions or precedents of those skilled in the art, the emergence of new technologies, etc. In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in such cases, the meaning thereof will be described in detail in the description of the invention. Therefore, the terms used in the present disclosure are not merely names of terms, but must be defined based on the meaning of the terms and the overall content throughout the present disclosure.

[0024] Throughout the specification, when a part includes an element, unless otherwise stated to the contrary, it does not exclude other elements, but means that it further includes other elements. Also, terms such as "part" and "module" described in the specification mean units that process at least one function or operation, and these can be implemented by hardware or software, or also by a combination of hardware and software.

[0025] Throughout the specification, "core-shell structure" means a structure in which a core is located inside and a shell is located outside the core. For example, the core-shell structure may mean a capsule structure in which the core is covered by a coating.

[0026] Throughout the specification, "tobacco substance" means any form of substance containing components derived from tobacco plants.

[0027] Throughout the specification, "tobacco particles" means particles of components derived from tobacco plants. For example, tobacco particles are also tobacco grains or tobacco powder.

[0028] Throughout the specification, "smoking article" means an article used by a user for smoking. A smoking article is, for example, also a combustible cigarette, or an aerosol-generating article that is heated without being combusted by an aerosol-generating device.

[0029] Throughout the specification, "surface roughness" means the roughness of a surface of an object. For example, surface roughness can be expressed by the center line average roughness (Ra) according to the KS B 0161 standard.

[0030] Throughout the specification, the term "parts by weight" means a value calculated based on 100 parts by weight of the tobacco substance, unless otherwise specified.

[0031] Terms including ordinal numbers such as "first" or "second" used in this specification can be used to describe various elements, but the elements are not limited by the terms. The terms are used for the purpose of distinguishing one element from another.

[0032] Hereinafter, embodiments of the present disclosure will be described in detail based on the accompanying drawings so that those having ordinary knowledge in the technical field to which the present disclosure belongs can easily implement them. However, the present disclosure can also be embodied in various different forms and is not limited to the embodiments described herein.

[0033] Hereinafter, embodiments of the present disclosure will be described in detail based on the drawings.

[0034] FIG. 1 is a drawing showing a tobacco substance 100 according to an embodiment. The tobacco substance 100 may have a core-shell structure and may include a core 110 containing a first tobacco mixture and a shell 120 containing a second tobacco mixture. Specifically, the first tobacco mixture may be located at the center of the tobacco substance 100, and the second tobacco mixture may be located outside the tobacco substance 100. The first tobacco mixture may be partially or entirely surrounded by the second tobacco mixture.

[0035] The core 110 may contain a first tobacco mixture. The first tobacco mixture may contain first tobacco particles and a first flavoring substance.

[0036] The first tobacco particles are, for example, tobacco powder having a size of about 0.1 to 0.3 mm, but are not limited thereto.

[0037] The first tobacco particles may contain various types of tobacco powder. The first tobacco particles may contain, for example, at least one tobacco powder of yellow variety, burley variety, native variety (fire-dried variety, sun-dried variety, air-dried variety).

[0038] The first flavoring substance is also a substance that emits a specific fragrance. For example, the first flavoring substance may contain plant-based fragrances such as cinnamon, sage, herb, chamomile, kudzu, hovenia dulcis, lavender, bergamot, lemon, orange, cinnamon bark, jasmine, ginger, vanilla, spearmint, peppermint, acacia, coffee, celery, sandalwood, cocoa, etc.

[0039] As another example, the first flavoring substance may contain animal-based fragrances such as musk, ambergris, civet, castoreum, etc.

[0040] As another example, the first flavoring substance is also an alcohol compound such as menthol, geraniol, linalool, anethole, or eugenol. Further, the first flavoring substance is also an aldehyde compound such as vanillin, benzaldehyde, or anisaldehyde. Further, the first flavoring substance is also an ester compound such as isoamyl acetate, linalyl acetate, isoamyl propionate, or linalyl butyrate. Desirably, the first flavoring substance is also menthol.

[0041] Based on 100 parts by weight of the first tobacco mixture, the first flavoring substance may be contained in an amount of about 20 parts by weight or less. However, the present disclosure is not particularly limited thereto, and various weights of the first flavoring substance may be included.

[0042] The first tobacco mixture may be, for example, a tobacco paste containing the first tobacco particles and the first flavoring substance. The first tobacco mixture may have an appropriate viscosity by being formed using a solvent such as water or ethanol. Even after the solvent is removed, the first tobacco mixture may have moisture. The process of manufacturing the first tobacco mixture will be described later.

[0043] The shell 120 may contain a second tobacco mixture. The second tobacco mixture may contain second tobacco particles. Regarding the second tobacco particles, the description of the first tobacco particles described above may be applied identically or similarly.

[0044] The second tobacco mixture may be, for example, a tobacco paste containing the second tobacco particles. The second tobacco mixture may have an appropriate viscosity by being formed using a solvent such as water or ethanol. Even after the solvent is removed, the second tobacco mixture may have moisture. The process of manufacturing the second tobacco mixture will be described later.

[0045] In one embodiment, the second tobacco mixture may further contain a second flavoring substance. Regarding the second flavoring substance, the description of the first flavoring substance described above may be applied identically or similarly.

[0046] When the second tobacco mixture further contains a second flavoring substance, the tobacco material 100 can also generate a flavor on the surface of the shell 120. Thereby, the tobacco material 100 can also generate a flavor before the start of smoking and in the initial stage of smoking.

[0047] The core 110 may have a diameter d1. The diameter d1 is, for example, about 0.1 to 0.5 mm, but is not necessarily limited thereto. The shell 120 may have a diameter d2. d2 is, for example, about 0.4 to 1.2 mm, but is not necessarily limited thereto.

[0048] The tobacco material 100 may have about 5.0 to 8.0 parts by weight of moisture. By the tobacco material 100 containing moisture within the above-described numerical range, at least one of the properties of hardness, flavor retention, and flavor expression of the tobacco material 100 can be improved. When the tobacco material 100 has less than about 5.0 parts by weight of moisture, the flavor expression of the tobacco material 100 decreases. When the tobacco material 100 has more than about 8.0 parts by weight of moisture, the tobacco material 100 may have a low hardness.

[0049] On the other hand, the core 110 may have about 8.0 to 15.0 parts by weight of moisture. By the core 110 containing moisture within the above-described numerical range, at least one of the properties of flavor retention and flavor expression of the core 110 can be improved. Further, since the moisture content of the core 110 is higher than the moisture content of the shell 120, the tobacco material 100 is excellent in hardness, flavor retention, and flavor expression.

[0050] The tobacco material 100 may not contain a binder. Generally, in order for the tobacco mixture to be firmly manufactured, the tobacco material 100 may contain a binder such as hydroxypropyl methylcellulose (HPMC) or carboxymethylcellulose (CMC). However, according to the present disclosure, the tobacco material 100 is excellent in properties such as durability, hardness, and viscosity even without containing the above-described binder.

[0051] The tobacco substance 100 can have a viscosity of about 5 to 200 cp. By having a viscosity within the aforementioned numerical range, at least one of the properties of hardness, aroma retention, and aroma expressiveness of the tobacco substance 100 can be improved. The viscosity of the tobacco substance 100 can be adjusted by the moisture content.

[0052] The tobacco substance 100 can have a hardness of about 90% or more. Specifically, the tobacco substance 100 can have a hardness of about 95% to 99.9%. The "hardness of the tobacco substance" is a physical property related to elasticity and resilience, and means the degree of resistance to the pressure applied in the vertical direction to the tobacco substance 100. The "hardness of the tobacco substance" is measured using a hardness measuring instrument and calculated through the following calculation formula.

[0053] Hardness (%) = [D - a] * 100 / D

[0054] (D: diameter of the tobacco substance, a: distance (mm) by which the tobacco substance is pushed in by a 300 g weight)

[0055] The tobacco substance 100 can have a specific gravity (density) of about 0.60 to 0.90 g / cc. Desirably, the tobacco substance 100 can have a specific gravity of about 0.62 to 0.75 g / cc.

[0056] The tobacco substance 100 can have a surface roughness (Ra) of about 0.1 to 10.0. The surface roughness of the tobacco substance 100 will be described in detail with reference to FIGS. 2A and 2B below.

[0057] By including a flavor substance in the core 110, the tobacco substance 100 can generate a flavor during combustion or heating. As an example, when the shell 120 does not contain a flavor substance, the tobacco substance 100 may not generate a flavor due to the flavor substance in the initial stage of smoking.

[0058] As another example, when the core 110 contains a first flavoring substance and the shell 120 contains a second flavoring substance, the tobacco material 100 can generate a flavor due to the second flavoring substance in the initial stage of smoking, and the tobacco material 100 can generate a flavor due to the first flavoring substance in the latter half of the smoking process. Thereby, the smoker can be provided with a flavor that changes over time during smoking.

[0059] FIG. 2A is a drawing showing a tobacco material 200 according to an embodiment.

[0060] Referring to FIG. 2A, the tobacco material 200 includes a core 210 and a shell 220. The core 210 may contain a first tobacco mixture, and the shell 220 may contain a second tobacco mixture. For the core 210 and the shell 220, the descriptions described above with reference to FIG. 1 may be applied identically or similarly.

[0061] The tobacco material 200 may have a spherical form as a whole. Since the core 210 has a spherical shape, the shell 220 formed around the core 210 may also have a spherical shape. The surface of the shell 220 may have a surface roughness (Ra) of, for example, about 0.1 to 10.0. By having the surface of the shell 220 have the surface roughness within the above-described numerical range, the flavor expressiveness of the tobacco material 200 can be improved, and a smoother surface can be formed. Therefore, when a plurality of tobacco materials 200 are filled into a smoking article (not shown), the amount of the filled tobacco material 200 can be increased.

[0062] Also, by adjusting the porosity of the surface of the shell 220, the flavor expressiveness of the tobacco material 200 can be adjusted.

[0063] FIG. 2B is a drawing showing a tobacco material 300 according to an embodiment.

[0064] Referring to FIG. 2B, the tobacco material 300 includes a core 310 and a shell 320. The core 310 may contain a first tobacco mixture, and the shell 320 may contain a second tobacco mixture. For the core 310 and the shell 320, the descriptions described above with reference to FIG. 1 may be applied identically or similarly.

[0065] The tobacco material 300 is also amorphous as a whole. In the manufacturing process of the tobacco material 300, when the shape of the core 310 is not a perfect sphere, the shape of the shell 320 growing while surrounding the core 310 may not be a perfect sphere either. As a result, as shown in FIG. 2B, the tobacco material 300 may have an uneven shape. In such a case, the surface of the shell 320 may have a surface roughness of about 5.0 to 10.0. The greater the surface roughness of the surface of the shell 320, the more the fragrance expressivity may be improved. Further, when a plurality of tobacco materials 300 are filled in a smoking article (not shown), the plurality of tobacco materials 300 are stably held in the smoking article by frictional force, and the surface area of the tobacco material 300 increases, and the amount of nicotine transfer during heating may increase.

[0066] FIG. 3A is a drawing showing a smoking article 400 according to an embodiment. The smoking article 400 is, for example, also a combustion-type cigarette.

[0067] Referring to FIG. 3A, the smoking article 400 may include a first portion 410 and a second portion 420. The first portion 410 is also a tobacco rod, and the second portion 420 is also a filter segment.

[0068] The first portion 410 may include a plurality of tobacco materials 411. The tobacco material 411 is also a tobacco material having the core-shell structure described above. The first portion 410 can be ignited and burned by a user.

[0069] The second portion 420 is also a filter segment. The second portion 420 may include a filter material. For example, the second portion 420 is also a cellulose acetate filter. The second portion 420 is also a cylindrical filter or a hollow filter, but the shape of the second portion 420 is not particularly limited. A user can smoke with the second portion 420 in the mouth.

[0070] When the first part 410 is burned, a fragrance can be generated from a plurality of tobacco substances 411. For example, when the tobacco substance 411 contains menthol in the core, no menthol fragrance is generated in the initial stage of smoking, and a menthol fragrance may be generated in the latter half of the smoking process.

[0071] As another example, when the tobacco substance 411 contains menthol in the core and also contains menthol on the surface of the shell, a menthol fragrance is generated before smoking and in the initial stage of smoking, and a menthol fragrance may also be continuously generated in the latter half of the smoking process.

[0072] Figure 3B is a drawing showing a smoking article 500 according to an embodiment. The smoking article 500 is also an article that is heated without being burned to generate an aerosol.

[0073] The smoking article 500 may include a first part 510, a second part 520, a third part 530, and a fourth part 540. The first part 510, the second part 520, the third part 530, and the fourth part 540 may be arranged along the longitudinal direction.

[0074] The first part 510 may include a tobacco substance 511. The tobacco substance 511 is also a tobacco substance having the aforementioned core-shell structure. The first part 510 may further include an aerosol-generating substance. The aerosol-generating substance may be applied to the surface of the tobacco substance 511, for example. The aerosol-generating substance is, for example, at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol. The first part 510 may be heated by an aerosol-generating device (not shown).

[0075] The second part 520 is also a support part for supporting the smoking article 500. As a specific example, the second part 520 is also a hollow filter. The second part 520 can play a role of connecting and supporting the first part 510 and the third part 530 to each other.

[0076] The third part 530 is also a cooling part for cooling the air flow. As a specific example, the third part 530 is also a hollow tube or a paper tube. The hollow tube or the paper tube may include a ventilation area (not shown) into which the air outside the smoking article 500 flows. The third part 530 can play a role in cooling the aerosol generated in the first part 510.

[0077] The fourth part 540 is also a filter segment. The fourth part 540 may contain a filter material. For example, the fourth part 540 is also a cellulose acetate filter. The fourth part 540 is also a cylindrical filter or a hollow filter, but the shape of the fourth part 540 is not particularly limited. The user can smoke with the fourth part 540 in the mouth.

[0078] FIG. 3C is a drawing showing a smoking article 600 according to an embodiment. The smoking article 600 is, for example, an article that is heated without being burned to generate an aerosol.

[0079] Referring to FIG. 3C, the smoking article 600 may include a first part 610, a second part 620, a third part 630, and a fourth part 640. The first part 610, the second part 620, the third part 630, and the fourth part 640 may be arranged along the longitudinal direction.

[0080] The first part 610 is also a filter segment. For example, the first part 610 is also a cellulose acetate filter having a hollow of a specific form inside. As a specific example, the first part 610 is also a cellulose acetate filter having a "herringbone" hollow, but not necessarily limited thereto.

[0081] The second part 620 may contain a tobacco substance 621. The tobacco substance 621 is also the tobacco substance of the core-shell structure described above. The second part 620 may further contain an aerosol generating substance. The aerosol generating substance can be applied to the surface of the tobacco substance 621, for example. The aerosol generating substance is, for example, at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol. The second part 620 can be heated by an aerosol generating device (not shown).

[0082] The third part 630 is also a cooling part for cooling the airflow. As a specific example, the third part 630 is also a hollow tube or a paper tube. The hollow tube or the paper tube may include a ventilation area (not shown) into which air outside the smoking article 600 flows. The third part 630 can play a role in cooling the aerosol.

[0083] The fourth part 640 is also a filter segment. The fourth part 640 may contain a filter substance. For example, the fourth part 640 is also a cellulose acetate filter. The fourth part 640 is also a cylindrical filter or a hollow filter, but the shape of the fourth part 640 is not particularly limited. The user can smoke with the fourth part 640 in the mouth.

[0084] FIG. 3D is a drawing showing a smoking article 700 according to an embodiment. The smoking article 700 is, for example, an article that is heated without being burned to generate an aerosol.

[0085] Referring to FIG. 3D, the smoking article 700 may include a first part 710, a second part 720, a third part 730, and a fourth part 740. The first part 710, the second part 720, the third part 730, and the fourth part 740 may be arranged along the longitudinal direction of the smoking article 700.

[0086] The first part 710 is also an aerosol. The aerosol generating substrate may include, for example, a paper sheet impregnated with an aerosol generating substance. The aerosol generating substance may be, for example, at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol. The first part 710 may be heated by an aerosol generating device (not shown).

[0087] The second part 720 is also a nicotine generating substrate. The second part 720 may include a tobacco substance 721. The tobacco substance 721 is also the tobacco substance of the core-shell structure described above. Further, the second part 720 may include, for example, a paper sheet impregnated with the tobacco substance 721 and an aerosol generating substance. The second part 720 may be heated by an aerosol generating device (not shown).

[0088] The third part 730 is also a cooling part for cooling the airflow. As a specific example, the third part 730 is also a hollow tube or a paper tube. The hollow tube or the paper tube may include a ventilation area (not shown) into which air outside the smoking article 600 can flow. The third part 730 can play a role in cooling the aerosol.

[0089] The fourth part 740 is also a filter segment. The fourth part 740 may include a filter substance. For example, the fourth part 740 is also a cellulose acetate filter. The fourth part 740 may be a cylindrical filter or a hollow filter, but the shape of the fourth part 740 is not particularly limited. The user can smoke with the fourth part 740 in the mouth.

[0090] FIG. 4 is a flowchart of a method (S100) for manufacturing a tobacco substance according to an embodiment. Referring to FIG. 4, the method (S100) for manufacturing a tobacco substance may include a first step (S110) and a second step (S120).

[0091] The first stage (S110) is also the stage of growing the first composition to form the core of the tobacco substance. The first composition may contain tobacco powder, water, and flavor substances. Specifically, the first composition may contain the flavor substance in an amount of about 0.1 to 20% by volume. For example, the first composition may be a tobacco paste containing a flavor substance.

[0092] Specifically, in the first stage (S110), the first composition can be suspended in the chamber and hot air dried for about 6 hours while supplying water at a temperature of about 60°C or less.

[0093] The second stage (S120) is also the stage of forming a shell surrounding the core of the tobacco substance. The shell can be formed from the second composition. The second composition may contain tobacco powder and water. Specifically, the second composition may contain about 40 to 70% by volume of tobacco powder and about 30 to 60% by volume of water. For example, the second composition may be a tobacco paste.

[0094] The tobacco substance produced through the first stage (S110) and the second stage (S120) may have a core-shell structure.

[0095] The core produced in the first stage (S110) may have a moisture content of about 8% to 15% based on the total weight of the tobacco substance. Also, the core may have a hardness of about 85% to 95%.

[0096] The shell produced in the second stage (S120) has relatively lower moisture content and higher hardness compared to the core. The tobacco substance produced through the second stage (S120) may have a moisture content of about 5% to 8% based on the total weight. Also, the shell may have a hardness of about 95% to 99.9%. Thus, the tobacco substance may have a hardness of about 95% to 99.9%.

[0097] The first stage (S110) and the second stage (S120) will be described in detail with reference to FIGS. 5A and 5B below.

[0098] FIG. 5A is a drawing showing the first step (S110) of a method for manufacturing a tobacco substance according to an embodiment.

[0099] Referring to FIG. 5A, the manufacturing apparatus for the tobacco substance may include a storage unit 1100, a supply unit 1200, and a chamber 1300. The storage unit 1100 can store the first composition A1. The supply unit 1200 can supply the first composition A1 from the storage unit 1100 to the chamber 1300. The chamber 1300 is also a place where the first composition A1 is formed into the core of the tobacco substance. The chamber 1300 may include an inlet 1310 through which air flows in from the outside.

[0100] The first step (S110) may include the step of moving the first composition A1 from the storage unit 1100 to the supply unit 1200. Thereby, the first composition A1 can be introduced from the supply unit 1200 into the chamber 1300.

[0101] The first composition A1 can be grown in the chamber 1300 under a temperature of about 30°C to 60°C and a wind pressure condition of about 1.5 bar or less. External air can flow from the outside to the inside of the chamber 1300 through the inlet 1310. Thereby, the first compositions A1 can aggregate and grow with each other to form the core S of the tobacco substance.

[0102] FIG. 5B is a drawing showing the second step (S120) of a method for manufacturing a tobacco substance according to an embodiment. Regarding the manufacturing apparatus for the tobacco substance, the content described above with reference to FIG. 5A may be applied identically or similarly.

[0103] Referring to FIG. 5B, in the second step (S120), the core S generated in the first step (S110) is positioned in the chamber 1300, and the second composition A2 can be introduced from the supply unit 1200 into the chamber 1300.

[0104] The second composition A2 can grow around the core S under the temperature of about 50°C to 90°C and the air pressure condition of about 1.5 bar or less in the chamber 1300. External air can flow from the outside to the inside of the chamber 1300 through the inlet 1310. Thereby, the second composition A2 can aggregate around the core S and grow into a shell. Through the first step (S110) and the second step (S120), a tobacco substance with a core-shell structure can be obtained.

[0105] Different from the first composition, the second composition A2 may contain ethanol. By adding ethanol to the second composition A2, it may have the effect of shortening the drying time of the shell and adjusting the hardness and roughness of the shell. Also, by adding ethanol to the second composition A2, it may have the effect of sterilizing the shell and removing abnormal odors.

[0106] In one embodiment, in the first step (S110), the first composition A1 can grow at a lower temperature than the second composition A2 in the second step (S120). Since the first composition A1 contains the first flavor substance, growing at a lower temperature than the second composition A2 is also advantageous for improving the aroma retention and aroma expression of the tobacco substance.

[0107] Although not shown in FIG. 5B, the method for manufacturing the tobacco substance may further include a third step. The third step is also a step of adding a second flavor substance to the surface of the tobacco substance with a core-shell structure formed in the second step. The second flavor substance is, for example, a substance that can be used as the first flavor substance, and the second flavor substance can be sprayed on the shell surface of the tobacco substance.

[0108] In one embodiment, when the tobacco substance with a core-shell structure manufactured through the first step to the third step is heated or burned, the tobacco substance emits aroma by the second flavor substance between before smoking and the initial stage of smoking, and the tobacco substance may emit aroma by the first flavor substance during the latter half of smoking.

[0109] Those having ordinary knowledge in the technical field related to this embodiment can understand that it can be embodied in a modified form within the scope not deviating from the essential characteristics described above. Therefore, the disclosed embodiments should be considered from an illustrative rather than a limiting perspective. The scope of the invention is shown not in the foregoing description but in the claims, and all differences within the equivalent scope thereof should be construed as being included in the invention.

Claims

1. A core containing a first tobacco mixture, and a shell formed around the core and containing a second tobacco mixture, wherein the first tobacco mixture is a tobacco paste containing first tobacco particles and a first flavoring substance, the second tobacco mixture is a tobacco paste containing second tobacco particles, and the tobacco substance further comprises a second flavoring substance formed on the surface of the shell.

2. The tobacco substance according to claim 1, wherein the tobacco substance contains 5.0 to 8.0 parts by weight of moisture based on 100 parts by weight of the whole tobacco substance.

3. The tobacco substance according to claim 1, wherein the first tobacco mixture contains 20 parts by weight or less of the first flavoring substance based on 100 parts by weight of the first tobacco mixture.

4. The tobacco substance according to claim 1, wherein the core has a diameter of 0.1 to 0.5 mm, and the shell has a diameter of 0.4 to 1.2 mm.

5. The tobacco substance according to claim 1, wherein the tobacco substance has a viscosity of 5 to 200 cp.

6. The tobacco substance according to claim 1, wherein the tobacco substance has a surface roughness (Ra) of 0.1 to 10.

0.

7. A smoking article comprising a tobacco rod containing the tobacco substance according to claim 1, and a filter segment.

8. A first step of growing a first composition to form a core, and a second step of growing a second composition around the core to form a shell surrounding the core, wherein the first composition is a tobacco paste containing first tobacco particles and a first flavoring substance, the second composition is a tobacco paste containing second tobacco particles, and a third step of adding a second flavoring substance to the surface of the shell formed by the first step and the second step is further included, the method for manufacturing a tobacco substance.

9. The first step includes: a step of introducing the first composition into a chamber, and a step of growing the first composition under a temperature of 30°C to 60°C and a wind pressure condition of 1.5 bar or less, the method for manufacturing a tobacco substance according to claim 8.

10. The second step includes: a step of positioning the core in the chamber, a step of introducing the second composition into the chamber, and a step of growing the second composition around the core in the chamber under a temperature of 50°C to 90°C and a wind pressure condition of 1.5 bar or less, the method for manufacturing a tobacco substance according to claim 8.

11. The method for producing a tobacco material according to claim 8, wherein the first composition contains 0.1 to 20% by volume of a first flavoring substance.

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