KR102694929B1 - Tobacco granules and manufacturing method thereof, and a smoking article including the tobacco granules - Google Patents

Abstract

According to one embodiment of the present invention, a tobacco granule is provided, which comprises a tobacco granule core formed from a first tobacco powder raw material and at least one tobacco granule shell layer formed from a second tobacco powder raw material and layered on the tobacco granule core.

Description

Tobacco granules and a method for manufacturing the same, and a smoking article comprising the tobacco granules {TOBACCO GRANULES AND MANUFACTURING METHOD THEREOF, AND A SMOKING ARTICLE INCLUDING THE TOBACCO GRANULES}

The present invention relates to tobacco granules and a method for manufacturing the same, and more specifically, to tobacco granules and a method for manufacturing the same, which reduce off-flavors while allowing control of the amount of vaporization and also secure a variety of smoking sensations through blending of various tobacco powder raw materials, and to a smoking article comprising the tobacco granules.

Conventional tobacco granule manufacturing methods generally use binders including hydroxypropyl methylcellulose, gum, and starch in the granule formation process to secure good binding force, surface properties, viscosity, and hardness between tobacco powder raw materials. Meanwhile, tobacco granules manufactured using such binders may cause an off-flavor such as a fibrous smell when the user smokes, and when the tobacco granules are burned or heated for smoking, the pores between the tobacco powders become smaller or disappear due to the hardening of the tobacco granules, which deteriorates the suckability and also reduces the enjoyment of smoking.

Accordingly, there is a need to develop tobacco granules and a method for manufacturing the same that can secure the binding force, surface properties, viscosity and hardness of tobacco granules required for commercialization, while also having excellent sensory characteristics such as reducing unpleasant odors and enhancing the enjoyment when smoking.

International Publication WO2009/223411 Publication of Patent Publication No. 10-2019-0049135

The present invention has been made to solve the above-described problems, and the purpose of the present invention is to provide tobacco granules and a method for manufacturing the same, which can reduce unpleasant tastes and enhance the enjoyment of smoking when smoking a smoking article including tobacco granules and improve the efficiency of the tobacco granule manufacturing process, and a smoking article including the tobacco granules.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

To solve these problems, according to some embodiments of the present invention, a tobacco granule is provided, which comprises a tobacco granule core formed from a first tobacco powder raw material; and at least one tobacco granule shell layer formed from a second tobacco powder raw material and layered on the tobacco granule core.

The above tobacco granule core may be formulated with a first binder consisting solely of propylene glycol and glycerin, and the tobacco granule shell layer may also be layered with a second binder consisting solely of propylene glycol and glycerin. Here, the dose ratio of the propylene glycol and the dose ratio of the glycerin in the first binder may be the same as the dose ratio of the propylene glycol and the glycerin in the second binder.

In some embodiments, the volume ratio of the propylene glycol to the volume ratio of the glycerin in the first binder, or the volume ratio of the propylene glycol to the volume ratio of the glycerin in the second binder, can be from 6:4 to 8:2.

Meanwhile, the capacity of the propylene glycol in the first binder may be greater than the capacity of the propylene glycol in the second binder, and the capacity of the glycerin in the first binder may be less than the capacity of the glycerin in the second binder.

In some embodiments, the first tobacco powder raw material and the second tobacco powder raw material may be different types of tobacco powder raw materials.

The particle size of the above tobacco granule core may be 0.2 mm to 0.8 mm, and the particle size of the above tobacco granule may be 0.9 mm to 2.0 mm.

Furthermore, according to some embodiments of the present invention, a smoking article is provided, comprising: a smoking material portion filled with tobacco granules in at least a portion of an area; and a filter portion positioned downstream of the smoking material portion, wherein the tobacco granules include a tobacco granule core formed of a first tobacco powder raw material, and at least one tobacco granule shell layer formed of a second tobacco powder raw material and layered on the tobacco granule core. The smoking material portion may further include a front plug positioned upstream of the smoking material portion.

According to some embodiments of the present invention, a method for manufacturing tobacco granules is provided, comprising: a step of formulating a first tobacco powder raw material to form a tobacco granule core; and a step of layering a second tobacco powder raw material on the tobacco granule core to form at least one tobacco granule shell layer. Here, at least one of the tobacco granule core and the tobacco granule shell layer can be formed of a binder composed solely of propylene glycol and glycerin.

In some embodiments, the weight ratio of the first tobacco powder raw material introduced in the step of forming the tobacco granule core and the capacity ratio of the binder may be 1:0.9 to 1:1.1, and the capacity ratio of the propylene glycol and the capacity ratio of the glycerin in the binder may be 6:4 to 8:2. In addition, the weight ratio of the second tobacco powder raw material introduced in the step of forming the tobacco granule shell layer and the capacity ratio of the binder may be 1:0.6 to 1:1, and the capacity ratio of the propylene glycol and the capacity ratio of the glycerin in the binder may be 6:4 to 8:2.

In some embodiments, the tobacco granule core may be formulated by a top spray process, and the tobacco granule shell layer may be layered by a tangential spray process.

In some embodiments, the top spray process may be performed for 50 to 70 minutes under conditions of an internal temperature of 30°C to 50°C, an internal pressure of 0.3 bar to 1.0 bar, and a binder injection pressure of 0.7 bar to 1 bar, and the tangential spray process may be performed for 40 to 60 minutes under conditions of an internal temperature of 30°C to 50°C, an internal pressure of 0.3 bar to 0.5 bar, and a binder injection pressure of 0.7 bar to 1 bar.

In some other embodiments, the top spray process is performed with a first formulation stage for 20 to 30 minutes and a second formulation stage for 30 to 40 minutes after the first formulation stage, the tangential spray process is performed with a first layering stage for 20 to 30 minutes and a second layering stage for 30 to 40 minutes after the first layering stage, the first formulation stage and the first layering stage are performed under conditions that the internal temperature is 20° C. to 40° C., the internal pressure is 0.3 bar to 0.5 bar, and the binder injection pressure is 0.7 bar to 0.8 bar, the second formulation stage is performed under conditions that the internal temperature is 40° C. to 50° C., the internal pressure is 0.5 bar to 1.0 bar, and the binder injection pressure is 0.8 bar to 1.0 bar, and the second layering stage is performed under conditions that the internal temperature is 40° C. to It can be performed under the conditions of 50℃, internal pressure of 0.3 bar to 0.5 bar, and binder injection pressure of 0.8 bar to 1.0 bar.

Meanwhile, the particle size of the first tobacco powder raw material and the particle size of the second tobacco powder raw material may be 0.05 mm to 0.1 mm, the particle size of the tobacco granule core may be 0.2 mm to 0.8 mm, and the particle size of the tobacco granules composed of the tobacco granule core and the tobacco granule shell layer may be 0.9 mm to 2.0 mm.

According to the method for manufacturing tobacco granules according to embodiments of the present invention, blending of various tobacco powder raw materials can be easily applied in the process of manufacturing a tobacco granule core and a tobacco granule shell layer, thereby ensuring product diversity, and the amount of vaporization can also be easily controlled by adjusting the amount of a moisturizing agent applied as a binder.

In addition, according to the tobacco granules of the present invention and the manufacturing method thereof, the tobacco granules can be manufactured using a binder composed only of propylene glycol and glycerin without containing components such as HPMC and GUM in the manufacturing process of the tobacco granules, and accordingly, the occurrence of unpleasant odors such as a fiber odor when the user smokes can be suppressed, and even when the tobacco granules are burned or heated for smoking, the problems of deterioration in suckability or reduction in taste do not occur.

Furthermore, when the tobacco granule core is formulated using a top spray process, and the tobacco granule shell layer is layered using a tangential spray process, and only a moisturizing ingredient is used as a binder to manufacture the tobacco granules, the tobacco granule properties such as binding strength, surface properties, viscosity, and hardness required for the commercialization of smoking articles can be secured, and further, the process efficiency can also be improved.

FIG. 1 is a flow chart exemplarily showing a method for manufacturing tobacco granules according to some embodiments of the present invention.
FIG. 2 is a diagram conceptually illustrating a process for forming a tobacco granule core according to some embodiments of the present invention.
FIG. 3 is a diagram conceptually illustrating a process for forming at least one tobacco granule shell layer according to some embodiments of the present invention.
FIG. 4 is a drawing illustrating an exemplary configuration of a smoking article according to some embodiments of the present invention.
FIG. 5 is a drawing illustrating an exemplary configuration of a smoking article according to another embodiment of the present invention.
FIG. 6 is a drawing illustrating an exemplary configuration of a smoking article according to another embodiment of the present invention.
Figure 7 is a drawing comparing the results of smoking sensory evaluations of smoking articles manufactured according to Example 1 and Comparative Example 1.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The advantages and features of the present invention and the methods for achieving them will become apparent with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and these embodiments are provided only to make the disclosure of the present invention complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with a meaning that can be commonly understood by a person of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries shall not be ideally or excessively interpreted unless explicitly and specifically defined.

Also, in this specification, the singular may also include the plural unless specifically stated otherwise in the phrase. As used in the specification, the terms "comprises" and/or "comprising" do not exclude the presence or addition of one or more other components, steps, operations and/or elements.

Terms including ordinal numbers, such as “first” or “second,” used in this specification may be used to describe various components, but the components should not be limited by the terms. The terms are used only to distinguish one component from another.

Throughout the specification, 'smoking article' may mean an article capable of generating an aerosol, such as a cigarette (cigarette), a cigar, etc. The smoking article may include an aerosol-generating material or an aerosol-forming substrate. In addition, the smoking article may include a solid material based on tobacco raw materials, such as leaf tobacco, tobacco ash, or reconstituted tobacco. The smoking material may include a volatile compound.

Meanwhile, in the description of smoking articles (100, 200, 300), 'upstream' or 'upstream direction' means a direction away from the mouth of a user smoking the smoking article, and 'downstream' or 'downstream direction' means a direction approaching from the mouth of a user smoking the smoking article. For example, in the smoking article (100) illustrated in FIG. 4, the smoking material portion (110) is located upstream or in the upstream direction of the filter portion (120).

FIG. 1 is a flow chart exemplarily showing a method for manufacturing tobacco granules according to some embodiments of the present invention.

Referring to FIG. 1, the method for manufacturing tobacco granules may include a step (S10) of formulating a first tobacco powder raw material to form a tobacco granule core, and a step (S20) of layering a second tobacco powder raw material on the tobacco granule core to form at least one tobacco granule shell layer. Here, the first tobacco powder raw material and the second tobacco powder raw material may be the same type of tobacco powder or different types of tobacco powder.

In some embodiments, the step of forming the tobacco granule core (S10) and the step of forming the tobacco granule shell layer (S20) may be performed as a fluidized bed process.

Meanwhile, conventional granule manufacturing methods generally use binders including hydroxypropyl methyl cellulose (HPMC), gum (GUM), and starch (STARCH) in the granule formation process to secure good binding force, surface properties, viscosity, and hardness between tobacco powder raw materials. Meanwhile, tobacco granules manufactured using such binders may cause an unpleasant odor such as a fibrous odor when the user smokes, and when tobacco granules are burned or heated for smoking, the pores between tobacco powders become smaller or disappear due to hardening of the tobacco granules, which deteriorates the suckability and also reduces the enjoyment of smoking.

According to the present invention, it is possible to manufacture tobacco granules using a binder composed of propylene glycol and glycerin without containing the above-mentioned components such as HPMC, GUM, etc., and thus the occurrence of unpleasant odors such as a fiber odor when a user smokes can be suppressed, and even when the tobacco granules are burned or heated for smoking, the problems of deterioration in smoky taste or reduction in smoking sensation do not occur.

Specifically, at least one of the step (S10) of forming the tobacco granule core and the step (S20) of forming the tobacco granule shell layer may be performed using a binder composed only of propylene glycol and glycerin. For example, both the tobacco granule core and the tobacco granule shell layer may be formed using a binder composed only of propylene glycol and glycerin. As another example, one of the tobacco granule core and the tobacco granule shell layer may be formed using a first binder partially containing an HPMC-type binder, and the other may be formed using a second binder composed only of propylene glycol and glycerin.

Meanwhile, in order to secure the binding force, surface properties, viscosity and hardness required for product manufacturing while increasing process efficiency when manufacturing tobacco granules using only a moisturizing ingredient as a binder, the tobacco granule core of the present invention is formulated using a top spray process, and the tobacco granule shell layer can be layered using a tangential spray process. More specific details about this will be described later with reference to FIGS. 2 and 3.

FIG. 2 is a diagram conceptually illustrating a process for forming a tobacco granule core according to some embodiments of the present invention.

Referring to FIG. 2, the first tobacco powder raw material (1a) can be formulated into a tobacco granule (or pellet) core (10) by a top spray process.

Specifically, a first tobacco powder raw material (1a) may be injected into the top spray device and a first binder (2a) composed of propylene glycol and glycerin may be sprayed. As the process progresses, the first tobacco powder raw materials (1a) inside the device may be cohesively rolled and formulated by the first binder (2a). The formulated particles (10') formed in this manner may be completed as tobacco granule cores (10) through heating and drying, etc.

Meanwhile, the weight ratio of the first tobacco powder raw material (1a) and the capacity ratio of the first binder (2a) introduced in the process of forming the tobacco granule core (10) may be approximately 1:0.9 to 1:1.1, and the capacity ratio of propylene glycol and glycerin in the first binder (2a) may be approximately 6:4 to 8:2. For example, the total weight of the first tobacco powder raw material (1a) introduced in the process of forming the tobacco granule core (10) may be approximately 450 g to 550 g, and the total capacity of the first binder (2a) sprayed may be 480 ml to 520 ml.

In some embodiments, the first binder (2a) can be sprayed substantially evenly during the top spray process, and when the total process is performed for about 60 minutes, for example, about 7 ml to 9 ml of binder can be sprayed into the device per minute.

Meanwhile, the particle size of the first tobacco powder raw material (1a) being injected may be about 0.05 mm to 0.1 mm, and the particle size of the tobacco granule core (10) whose formulation is complete may be about 0.2 mm to 0.8 mm.

In some embodiments, the top spray process can be performed under conditions of an internal temperature of about 20° C. to 60° C. (preferably 30° C. to 50° C.), an internal pressure of about 0.1 bar to 1.5 bar (preferably 0.3 bar to 1.0 bar), and a binder injection pressure of about 0.3 bar to 1.5 bar (preferably 0.7 bar to 1 bar) for about 40 minutes to 80 minutes (preferably 50 minutes to 70 minutes). The air supply temperature for the above process conditions may be about 30° C. to 60° C., the air exhaust temperature may be about 30° C. to 50° C., and the pressure of the air exhaust filter region may be about 0.1 bar to 0.3 bar, but is not limited thereto.

Meanwhile, in some embodiments, in order to form the tobacco granule core in a state optimized for the subsequent layering process, the top spray process may be performed in a first formulation stage of about 20 to 30 minutes and a second formulation stage of about 30 to 40 minutes performed after the first formulation stage. Here, the first formulation stage may be performed under conditions of an internal temperature of about 20°C to 40°C, an internal pressure of about 0.3 bar to 0.5 bar, and a binder injection pressure of about 0.7 bar to 0.8 bar, and the second formulation stage may be performed under conditions of an internal temperature of about 40°C to 60°C, an internal pressure of about 0.5 bar to 1.0 bar, and a binder injection pressure of about 0.8 bar to 1.0 bar.

FIG. 3 is a diagram conceptually illustrating a process for forming at least one tobacco granule shell layer according to some embodiments of the present invention.

Referring to FIG. 3, a second tobacco powder raw material (1b) is layered on a core particle (10x), thereby manufacturing a tobacco granule (30) in which at least one tobacco granule shell layer is formed. The core particle (10x) illustrated in FIG. 3 may be a tobacco granule core (10) described with reference to FIG. 2, or may be a particle (30") in which at least one tobacco granule shell layer (20') is layered on a tobacco granule core (10).

Specifically, a tobacco granule core (10) is injected into the tangential spray device, and a second tobacco powder raw material (1b) and a second binder (2b) composed of propylene glycol and glycerin can be sprayed. Here, the second tobacco powder raw material (1b) may be the same type of tobacco powder as the first tobacco powder raw material (1a), but may also be a different type of tobacco powder from the first tobacco powder raw material (1a). The second binder (2b) may also be a binder of the same type and composition as the first binder (2a), but may also be a binder of a different type or composition from the first binder (2a).

As the process progresses, the second tobacco powder raw materials (1b) may be rolled and layered by coagulating with each other on the surface of the core particle (10x), and the particles (30') in which the second tobacco powder raw materials (1b) are layered on the core particle (10x) may be formed into particles (30") in which at least one shell layer (20') is layered through heating and drying, etc., and by repeating this layering process, a plurality of tobacco granule shell layers (20) may be formed, thereby completing a tobacco granule (30).

In some embodiments, at least some of the shell layers of the plurality of tobacco granule shell layers (20) may be formed of a different type or grade of tobacco raw material powder from the remaining shell layers. That is, the second tobacco powder raw material (1b) input into the tangential spray process may be replaced in the repeated layering process. For example, at least one shell layer of the tobacco granule shell layers (20_1, 20_2, 20_3) illustrated in FIG. 3 may be formed of tobacco powder made of burley type leaf tobacco, and the remaining shell layers may be formed of tobacco powder made of yellow type leaf tobacco. As another example, at least one shell layer of the tobacco granule shell layers (20_1, 20_2, 20_3) may be formed of tobacco powder made of burley type upper leaves, and the remaining shell layers may be formed of tobacco powder made of burley type true leaves, but the present invention is not limited thereto. In addition, the tobacco granule (30) illustrated in FIG. 3 is illustrated as having three tobacco granule shell layers (20_1, 20_2, 20_3) formed on the tobacco granule core (10), but this is for clarity of explanation and the number of tobacco granule shell layers is not limited thereto.

Meanwhile, the ratio of the total weight of the second tobacco powder raw material (1b) and the total capacity of the second binder (2b) introduced in the process of forming the tobacco granule shell layer (20) may be approximately 1:0.6 to 1:1. In addition, the ratio of the total weight of the tobacco granule core (10) and the total weight of the second tobacco powder raw material (1b) introduced in the process of forming the tobacco granule shell layer (20) may be approximately 1:1.5 to 1:2.5 (preferably, 1:1.7 to 1:2.3). For example, the total weight of the tobacco granule core (10) introduced in the process of forming the tobacco granule shell layer (20) may be about 300 g to 400 g, the total weight of the second tobacco powder raw material (1b) may be about 600 g to 800 g, and the total volume of the second binder (2b) sprayed may be about 500 ml to 560 ml.

In some embodiments, the ratio of the amount of propylene glycol in the second binder (2b) to the amount of glycerin may be about 6:4 to 8:2. Meanwhile, according to some embodiments, the amount of propylene glycol in the second binder (2b) may be smaller than the amount of propylene glycol in the first binder (2a), and the amount of glycerin in the second binder (2b) may be larger than the amount of glycerin in the first binder (2a), thereby ensuring good physical properties (binding force, hardness, etc.) of the tobacco granules (30) while further maximizing the effect of minimizing the loss of atomization amount that may occur during combustion or heating of the tobacco granules.

In some embodiments, the second binder (2b) can be sprayed substantially evenly during the tangential spray process, and when the total process is performed for about 50 minutes, for example, about 9 ml to 10 ml of binder can be sprayed into the device per minute. The second tobacco powder raw material (1b) can also be injected substantially evenly during the tangential spray process, and when the total process is performed for about 50 minutes, for example, about 9 g to 14 g of powder can be sprayed into the device per minute.

Meanwhile, the particle size of the second tobacco powder raw material (1b) being introduced may be about 0.05 mm to 0.1 mm, and the particle size of the completed tobacco granules (30) may be about 0.9 mm to 2.0 mm.

In some embodiments, the tangential spray process can be performed under conditions of an internal temperature of about 20° C. to 60° C. (preferably 30° C. to 50° C.), an internal pressure of about 0.1 bar to 1.0 bar (preferably 0.3 bar to 0.5 bar), and a binder injection pressure of about 0.3 bar to 1.5 bar (preferably 0.7 bar to 1 bar) for about 30 minutes to 70 minutes (preferably 40 minutes to 60 minutes). The air supply temperature for the above process conditions may be about 40° C. to 70° C., the air exhaust temperature may be about 40° C. to 60° C., and the pressure in the air exhaust filter region may be about 0.1 bar to 0.3 bar, but is not limited thereto.

Meanwhile, in some embodiments, in order to secure a uniform and homogeneous tobacco granule shell layer as well as the rigidity of the final tobacco granule, the tangential spray process may be performed in a first layering stage of about 20 to 30 minutes and a second layering stage of about 30 to 40 minutes performed after the first layering stage. Here, the first layering stage may be performed under the conditions that the internal temperature is about 30°C to 40°C, the internal pressure is about 0.3 bar to 0.5 bar, and the binder injection pressure is about 0.7 bar to 0.8 bar, and the second layering stage may be performed under the conditions that the internal temperature is about 40°C to 50°C, the internal pressure is about 0.3 bar to 0.5 bar, and the binder injection pressure is about 0.8 bar to 1.0 bar.

FIG. 4 is a drawing illustrating an exemplary configuration of a smoking article (100) according to some embodiments of the present invention.

Referring to FIG. 4, the smoking article (100) may include a smoking material portion (110) wrapped with a smoking material wrapper (110a), a filter portion (120) wrapped with a filter wrapper (120a), and a tip paper (130) that combines the smoking material portion (110) and the filter portion (120). In some embodiments, the smoking article (100) may be a combustible cigarette in which the smoking material portion (100) is combusted to generate an aerosol and deliver it to a user.

The smoking material portion (110) of the present invention may be filled with the above-described tobacco granules in its entirety. Alternatively, the smoking material portion (110) may be filled with a mixture of the above-described tobacco granules and at least two of the raw tobacco leaf and plate-shaped leaf in the form of a sheet or a sliver. The smoking material portion (110) may have an elongated rod shape, and its length, circumference, and diameter may vary.

The tobacco granules to be filled may be tobacco granules manufactured by the method described with reference to FIGS. 1 to 3. That is, the tobacco granules may include a tobacco granule core and at least one tobacco granule shell layer formed by layering on the tobacco granule core.

In some embodiments, the particle size of the tobacco granule core may be about 0.2 mm to 0.8 mm (preferably, 0.3 mm to 0.7 mm), and the particle size of the tobacco granule may be about 0.9 mm to 2.0 mm (preferably, 1.0 mm to 1.8 mm).

Meanwhile, the tobacco granule core and the tobacco granule shell layer may be made of different tobacco powder raw materials. Alternatively, the tobacco granule may include a plurality of tobacco granule shell layers, and some of the tobacco granule core, some of the tobacco granule shell layers, and other some of the shell layers may all be made of different tobacco powder raw materials. For example, the tobacco granule core may be made of a first tobacco powder, some of the tobacco granule shell layers may be made of a second tobacco powder different from the first tobacco powder, and some of the other tobacco granule shell layers may be made of a third tobacco powder different from the first or second tobacco powder.

The above tobacco granule core may be formulated with a binder composed only of propylene glycol and glycerin, and thus the tobacco granule core may not contain components such as HPMC or GUM. The above tobacco granule shell layer may also be layered with a binder composed only of propylene glycol and glycerin, and thus the tobacco granule shell layer may also not contain components such as HPMC or GUM.

In some embodiments, the content ratio of propylene glycol and glycerin contained in the tobacco granule core may be substantially the same as the content ratio of propylene glycol and glycerin contained in the tobacco granule shell layer. Here, the content ratio of propylene glycol and glycerin contained in the tobacco granule core and/or the tobacco granule shell layer may be 6:4 to 8:2.

The above smoking material portion (110) can be wrapped by a smoking material wrapper (110a). Meanwhile, the tobacco granules manufactured by the above-described embodiments of the present invention have a viscosity higher than an appropriate level, and accordingly, even if the smoking material portion (110) is filled only with tobacco granules, the tobacco granules can be prevented from escaping to the outside of the smoking article (100) through the open upstream end of the smoking article (100).

In some embodiments, the smoking material wrapper (110a) may be added with glycerin and a combustion aid such as K-citrate and/or NA-citrate to promote complete combustion of the smoking material by catalytic action, etc., and may further include a filler such as calcium carbonate, titanium dioxide, or magnesium oxide.

In some embodiments, the smoking material wrapper (110a) may have a double-walled structure. Specifically, the smoking material wrapper (110a) may include an inner wrapper that contacts the smoking material portion (110) and wraps the smoking material portion (110), and an outer wrapper that contacts the inner wrapper and wraps the outside of the inner wrapper.

Furthermore, the smoking material wrapper (110a) may be a low ignition propensity (LIP) cigarette paper having one or more low ignition propensity (LIP) bands (not shown) formed thereon.

The LIP band can lower the porosity of the smoking material wrapper (110a), and accordingly, when the combustion of the cigarette reaches the LIP band, the amount of oxygen flowing into the smoking material portion (110) decreases, so that the smoking article (100) that was burning can be extinguished. Here, the LIP band can be a coating layer formed on the inner and/or outer surface of the smoking material wrapper (110a).

The filter section (120) may be positioned downstream of the smoking material section (110) and may be an area through which aerosol material generated from the smoking material section (110) passes immediately before the user inhales it.

The filter part (120) can be formed of various materials, for example, the filter part (120) can be a cellulose acetate filter.

In some embodiments, the filter unit (120) may be a cellulose acetate filter in which the fragrance material is not scented, but is not limited thereto, and the filter unit (120) may be a transfer jet nozzle system (TJNS) filter in which the fragrance material is scented.

In some embodiments, the filter unit (120) may be a tube-shaped structure including a hollow space inside. In addition, the filter unit (120) may be manufactured by inserting a structure such as a film or tube of the same or different material into the inside (e.g., the hollow space).

Meanwhile, the hardness of the filter part (120) can be adjusted by adjusting the content of the plasticizer during the manufacture of the filter part (120). Triacetin can be used as the plasticizer, but the type and content of the plasticizer are not limited thereto and can be appropriately adjusted as needed.

The filter unit (120) of the present embodiment is illustrated as a mono filter consisting of a single filter, but is not limited thereto. For example, the filter unit (120) may be provided as a dual filter or triple filter having two acetate filters to increase filter efficiency.

In addition, although not shown, the filter unit (120) may include a capsule (not shown) inside. The capsule may have a structure in which the contents including the fragrance are wrapped with a film, and for example, the capsule may have a spherical or cylindrical shape. The material forming the film of the capsule may be a natural material, starch, and/or a gelling agent. For example, in the case of the film of a natural material, it may be composed of agar, pectin, sodium alginate, and glycerin. Gellan gum or gelatin may be used as the gelling agent. In addition, a gelling agent may further be used as the material forming the film of the capsule. As the gelling agent, for example, calcium chloride may be used. In addition, a plasticizer may further be used as the material forming the film of the capsule. Here, glycerin and/or sorbitol may be used as the plasticizer. In addition, a coloring agent may further be used as the material forming the film of the capsule.

In some embodiments, as a solvent for the fragrance contained in the contents of the capsule, for example, medium chain fatty acid triglyceride (MCTG) may be used. In addition, the contents may contain other additives such as a colorant, an emulsifier, a thickener, etc. The contents of the capsule may contain a fragrance such as menthol, plant essential oil, etc., but is not limited thereto.

The filter section (120) described above is placed downstream of the smoking material section (110) and functions as a filter through which aerosol substances generated from the smoking material section (110) pass immediately before the user inhales them.

The above filter part (120) may be wrapped by a filter wrapper (120a). In some embodiments, the filter wrapper (120a) may be made of an oil-resistant paper. The filter wrapper (120a) may be made of an oil-resistant paper to prevent the contents of the capsule, which may be included in the filter part (120) and is released outside the capsule when the capsule is crushed by a smoker, from passing through the filter wrapper (120a). In some embodiments, the inner surface of the filter wrapper (120a) may further include aluminum foil.

The filter portion (120) wrapped by the filter wrapper (120a) and the smoking material portion (110) wrapped by the smoking material wrapper (110a) can be combined and wrapped by the tip paper (130). That is, the tip paper (130) can be wrapped around at least a portion (for example, a downstream portion) of the smoking material wrapper (110a) and the outer periphery of the filter wrapper (120a). Meanwhile, the tip paper (130) can include a non-combustible material to prevent the filter portion (120) from being burned along with the combustion of the smoking material portion (110).

FIG. 5 is a drawing illustrating an exemplary configuration of a smoking article according to another embodiment of the present invention.

Referring to FIG. 5, the smoking article (200) may include a smoking material portion (210), a support structure (220), a cooling structure (230), a mouthpiece portion (240), and a wrapper (260). In some embodiments, the smoking article (200) may be a non-combustion (or heated) cigarette used with an aerosol generating device (not shown), such as an electronic cigarette device.

The smoking material portion (210) of the present invention may be filled with tobacco granules described with reference to FIGS. 1 to 4 in part or in the entire area. The smoking material portion (210) may have a configuration substantially similar to the smoking material portion (210) described with reference to FIG. 3, and a detailed description thereof will be omitted.

The support structure (220) may be a tube-shaped structure including a hollow space (220H) therein. The support structure (220) may be manufactured using cellulose acetate, and thus, when a heater (not shown) of an aerosol generating device is inserted, the internal material of the smoking material portion (210) may be prevented from being pushed backwards (i.e., in a downstream direction), and a cooling effect of the aerosol may also occur.

In some embodiments, the hardness of the support structure (220) can be adjusted by controlling the content of the plasticizer during the manufacture of the support structure (220). In addition, the support structure (220) can also be manufactured by inserting a structure such as a film or tube of the same or different material into the interior (i.e., the hollow space (220H)).

The cooling structure (230) may be positioned in contact with the support structure (220) and downstream of the support structure (220). The cooling structure (230) may serve as a cooling member that cools the aerosol generated by the heater (not shown) of the aerosol generating device heating the smoking material portion (210). Accordingly, the user may inhale the aerosol cooled to an appropriate temperature.

The cooling structure (230) can be manufactured through an extrusion method or a fiber weaving method. The cooling structure (230) can be manufactured in various shapes to increase the surface area per unit area (i.e., the surface area in contact with the aerosol).

In some embodiments, the cooling structure (230) may be manufactured by weaving polymer fibers. In this case, a flavoring agent may be applied to the fibers manufactured from the polymer. Alternatively, the cooling structure (230) may be manufactured by weaving together separate fibers to which a flavoring agent has been applied and fibers manufactured from the polymer.

The cooling structure (230) may also be manufactured using a polymer material or a biodegradable polymer material. For example, the polymer material includes, but is not limited to, gelatin, polyethylene (PE), polypropylene (PP), polyurethane (PU), fluorinated ethylene propylene (FEP), and combinations thereof. In addition, the biodegradable polymer material includes, but is not limited to, polylactic acid (PLA), polyhydroxybutyrate (PHB), cellulose acetate, poly-epsilon-caprolactone (PCL), polyglycolic acid (PGA), polyhydroxyalkanoates (PHAs), and starch-based thermoplastic resins.

In some embodiments, the cooling structure (230) may be manufactured only from pure polylactic acid (PLA). For example, the cooling structure (230) may be a three-dimensional woven fabric manufactured using one or more fiber strands (hereinafter referred to as “fiber strands”) manufactured from pure polylactic acid. Here, the thickness and length of the fiber strands, the number of fiber strands constituting the cooling structure (230), and the shape of the fiber strands may vary. When the cooling structure (230) is manufactured from pure polylactic acid, the generation of a specific substance during the process in which an aerosol passes through the cooling structure (230) may be prevented.

The cooling structure (230) can be produced by one or more processes, and a process of wrapping the outside of the cooling structure (230) with a wrapper made of paper or a polymer material can be added. Here, the polymer material includes, but is not limited to, gelatin, polyethylene (PE), polypropylene (PP), polyurethane (PU), fluorinated ethylene propylene (FEP), and combinations thereof.

Meanwhile, since the cooling structure (230) is formed by woven polymer fibers or crimped polymer sheets, the cooling structure (230) may include a single or multiple channels extending in the longitudinal direction. Here, the channel means a passage through which a gas (e.g., air or aerosol) passes.

In some embodiments, the cooling structure (230) may include threads containing a volatile flavor ingredient. Here, the volatile flavor ingredient may be, but is not limited to, menthol.

Alternatively, the cooling structure (230) may be formed by winding a porous paper sheet. That is, the rolled porous paper sheet may be positioned inside the cooling structure (230) so that airflow (e.g., aerosol) may pass along the longitudinal direction of the cooling structure (230). In this case, the rolled porous paper sheet may be positioned inside the cooling structure (230) while forming various patterns so that airflow may pass along the longitudinal direction of the cooling structure (230). For example, a honeycomb-patterned airflow path, an irregularly patterned airflow path, a swirl-shaped airflow path, or a concentric airflow path may be formed inside the cooling structure (230). The porous paper may be a material having elastic restoring force and flexibility, and may be made of, for example, a cellulose-based material used in wrappers, such as birch or bamboo.

When the cooling structure (230) is formed of a porous paper sheet, a coating material composed of sucrose (e.g., sucrose powder), distilled water, and starch syrup may be applied to the porous paper material. The starch syrup included in the coating material plays a role of controlling viscosity and suppressing precipitation of sugar/glucose crystals. Meanwhile, the material included in the coating material is not limited to the above-described examples, and additional materials may be further added to increase the efficiency of the coating operation and drying operation of the cooling structure (230). In one embodiment, the concentration of sucrose (e.g., sucrose powder) relative to the total concentration of the coating material applied to the porous paper is 30% wt to 70% wt, and the weight of the starch syrup relative to the total weight of the coating material may be 40% or less, but is not limited thereto.

In another embodiment, the cooling structure (230) may be an edible film. The edible film may include a biodegradable film material. For example, starch or cellulose and their derivatives such as pectin, alginate, carrageenan, chitosan, etc. may be used as the biodegradable film material. In addition, pullulan having excellent coating and film forming properties may be further added to the edible film. The cooling structure (230) in the form of an edible film may be formed by mixing the above-described biodegradable film material with sucrose. In another embodiment, the cooling structure (230) in the form of a sheet may have a viscosity like wax. In order to have a viscosity like wax, the cooling structure (230) may be composed of an acidic solution such as sucrose, lemon juice, vinegar, and distilled water.

Meanwhile, the cooling structure (230) may be a tube-shaped structure including a hollow body (230H) inside, as illustrated in FIG. 5. The cross-sectional shape of the hollow body may be a polygon or a circle, but in this case, the inner diameter of the cooling structure (230) may be larger than the inner diameter of the support structure (220). For example, the inner diameter of the support structure (220) may be about 2.5 mm, and the inner diameter of the cooling structure (230) may be about 4.2 mm, but the size and shape of the hollow body are not limited thereto.

Since the inner diameter of the cooling structure (230) located downstream from the support structure (220) is larger than the inner diameter of the support structure (220), the mainstream smoke flowing from the hollow space (220H) of the support structure (220) to the hollow space (230H) of the cooling structure (230) can be diffused. As the diffused mainstream smoke has a reduced bias in the downstream direction of the aerosol-generating article (200), the contact area and time with the external air flowing into the interior of the cooling structure (230) increase, and accordingly, the cooling effect of the mainstream smoke can be improved. Here, when a pipe having an inner diameter of about 90% to 95% of the outer diameter is applied as the cooling structure (230), the difference between the inner diameter of the support structure (220) and the inner diameter of the cooling structure (230) can be maximized, and accordingly, the mainstream smoke diffusion effect and the resulting mainstream smoke cooling effect can be further maximized.

For example, the cooling structure (230) may include a material that allows external gas to flow into the hollow portion of the cooling structure (230) from the outside, and the material may be a mixture of a plurality of materials. The material may be, for example, cellulose acetate tow. As another example, the material of the cooling structure (230) itself may be a material that does not allow external gas to flow into the hollow portion of the cooling structure (230), and in this case, perforations may be formed in some areas of the cooling structure as needed to allow external air to flow in.

In some embodiments, a flavoring/moisturizing treatment may be applied to each of the support structure (220) and the cooling structure (230). For example, the support structure (220) may be a flavoring tube filter and the cooling structure (230) may be a moisturizing tube filter. Alternatively, the support structure (220) may be a moisturizing tube filter and the cooling structure (230) may be a flavoring tube filter. Alternatively, the support structure (220) and the cooling structure (230) may be flavoring moisturizing tube filters treated with both a flavoring component and a moisturizing component.

The mouthpiece portion (240) may serve as a mouthpiece that ultimately delivers the aerosol delivered from the upstream to the user by being located at the downstream end of the smoking article (200). In some embodiments, the mouthpiece portion (240) may be a cellulose acetate filter. Although not shown, the mouthpiece portion (240) may also be manufactured as a recessed filter.

In some embodiments, the mouthpiece portion (240) may include at least one capsule (not shown). The capsule may be, for example, a spherical or cylindrical capsule enclosing a liquid containing a flavoring agent in a film.

The wrapper (260) may be a porous paper or a non-porous paper. Meanwhile, at least one of the smoking material portion (210), the support structure (220), the cooling structure (230), and the mouthpiece portion (240) may be individually wrapped with separate wrappers before being wrapped by the wrapper (260). For example, the smoking material portion (210) may be wrapped by a smoking material wrapper (not shown), and the support structure (220), the cooling structure (230), and the mouthpiece portion (240) may be individually wrapped by a first filter wrapper (not shown), a second filter wrapper (not shown), and a third filter wrapper (not shown), respectively; however, the manner in which the smoking article (200) and its constituent parts are wrapped by the wrappers is not limited thereto.

In some embodiments, the wrappers may have different properties depending on the area they each enclose. Additionally, the inner surface of the smoking material wrapper and/or the first filter wrapper may be formed with aluminum foil.

Meanwhile, the second filter wrapper wrapping the cooling structure (230) and the third filter wrapper wrapping the mouthpiece portion (240) may be made of hard paper, but are not limited thereto.

In some embodiments, a predetermined material may be added to the wrapper (260). Here, an example of the predetermined material may be silicon, but is not limited thereto. For example, silicon has properties such as heat resistance that is less affected by temperature, oxidation resistance that does not oxidize, resistance to various chemicals, water repellency, or electrical insulation. However, even if it is not silicon, any material having the above-described properties may be applied (or coated) to the wrapper (260) without limitation.

The wrapper (260) can prevent the smoking article (200) from burning. For example, if the smoking material portion (210) is heated by a heater (not shown) of an aerosol generating device, there is a possibility that the smoking article (200) may burn. More specifically, if the temperature rises above the ignition point of any one of the materials included in the smoking material portion (210), the smoking article (200) may burn. Even in this case, since the wrapper (260) includes a non-combustible material, the smoking article (200) can be prevented from burning.

In addition, the wrapper (260) can also prevent the holder (not shown) of the aerosol generating device from being contaminated by substances generated from the smoking article (200). Liquid substances can be generated within the smoking article (200) by a user's puff. For example, liquid substances (e.g., moisture, etc.) can be generated when the aerosol generated from the smoking article (200) is cooled by external air. As the wrapper (260) wraps each segment (210, 220, 230, 240) of the smoking article, liquid substances generated within the smoking article (200) can be prevented from leaking outside the smoking article (200).

FIG. 6 is a drawing illustrating an exemplary configuration of a smoking article according to another embodiment of the present invention.

Referring to FIG. 6, the smoking article (300) may include a front filter segment (or, front plug; 350), a smoking material portion (310), a support structure (320), a mouthpiece portion (340), and a wrapper (360). The smoking article (300) may be a non-combustion (or heated) cigarette used with an aerosol generating device (not shown) such as an electronic cigarette device.

Each of the smoking material portion (310), the support structure (320), the mouthpiece portion (340) and the wrapper (360) may have a configuration substantially similar to each of the smoking material portion (210), the support structure (220), the mouthpiece portion (240) and the wrapper (260) described with reference to FIG. 5, and in the following, for the sake of simplicity, the differences from the smoking article (200) described with reference to FIG. 5 will be mainly explained.

Unlike the smoking articles (100, 200) described with reference to FIGS. 4 and 5, the smoking article (300) may further include a front filter segment (350) that borders the smoking material portion (310) upstream of the smoking material portion (310).

The shear filter segment (350) can be made of cellulose acetate. The shear filter segment (350) can physically block the smoking material portion (310) from escaping outside the smoking article (300), and can also prevent the liquefied aerosol from the smoking material portion (310) during smoking from flowing into the aerosol generating device (not shown).

Meanwhile, the pre-filter segment (350) may include a hollow channel (350H) extending from the upstream end to the downstream end as illustrated in FIG. 6. The channel (350H) may be located at the center of the pre-filter segment (350). For example, the center of the channel (350H) may coincide with the center of the pre-filter segment (350).

When a channel (350H) is provided in the pre-filter segment (350), aerosol flowing into the upstream end of the pre-filter segment (350) can more easily escape to the downstream end of the pre-filter segment (350), so that a user can easily inhale the aerosol.

Although the channel (350H) in this embodiment is illustrated as having a circular cross-sectional shape, the cross-sectional shape of the channel (350H) is not limited thereto. For example, the cross-sectional shape of the channel (350H) may be a trilobal shape.

Hereinafter, the composition of the present invention and the effects thereof will be described in more detail through examples and comparative examples. However, these examples are intended to explain the present invention more specifically, and the scope of the present invention is not limited to these examples.

Example 1

For the purpose of the examples, the smoking material portion of a cigarette manufactured for testing was removed and the smoking material portion was filled with tobacco granules to manufacture a cigarette having the same structure as the smoking article (100) illustrated in FIG. 4.

Each of the tobacco granules used had a structure including a tobacco granule core and at least one tobacco granule shell layer formed by layering on the tobacco granule core, and were selected as tobacco granules having an average particle diameter of about 1.3 mm and an average core particle diameter of about 0.5 mm. In addition, the tobacco granule core and the tobacco granule shell layer were formed with a binder composed of 70 wt% of propylene glycol and 30 wt% of glycerin, and therefore, the tobacco granule core and the tobacco granule shell layer did not contain components such as HPMC and GUM. The tobacco granule core was formed by formulating burley tobacco powder by a top spray process, and the tobacco granule shell layer was formed by layering yellow tobacco powder on the core by a tangential spray process, and therefore, the tobacco granules contained burley tobacco powder and yellow tobacco powder in a ratio of about 4:6.

Comparative Example 1

Except that tobacco powder containing burley tobacco powder and yellow tobacco powder in a ratio of about 4:6 was granulated using a binder consisting of 10 wt% HPMC, 63 wt% propylene glycol, and 27 wt% glycerin to produce tobacco granules not having a core/shell structure, a cigarette was manufactured in the same manner as in Example 1. The smoking material portion was selected and filled with tobacco granules having substantially the same average particle size as in Example 1.

Experimental Example 1: Smoking Sensory Evaluation of Example 1 and Comparative Example 1

A sensory evaluation was conducted on the smoking intensity, smoking duration, smoke volume satisfaction, fastness, off-flavor during smoking, and overall satisfaction after smoking of smoking articles. The sensory characteristic evaluation was conducted on 21 evaluation panel members using each smoking article manufactured according to the examples, and a total of 7 points were used as the standard.

Figure 7 is a drawing comparing the results of smoking sensory evaluations of smoking articles manufactured according to Example 1 and Comparative Example 1.

Referring to FIG. 7, it can be confirmed that Example 1 increased in terms of smoking intensity, smoking duration, vapor volume satisfaction, suckability, and post-smoking satisfaction characteristics, and that off-flavors during smoking were noticeably reduced compared to Comparative Example 1. In particular, the differences between the Example and Comparative Example in the characteristics of smoking duration, suckability, and off-flavors during smoking were more prominent, and among these, the improvement in smoking duration is expected to be the result of the fact that the tobacco granules of Example 1 have a core/shell structure, and the improvements in suckability and off-flavors are expected to be the result of the fact that only a humectant component was used as a binder in the formation of the tobacco granules of Example 1.

Those skilled in the art related to the present embodiment will understand that the above-described description can be implemented in a modified form without departing from the essential characteristics thereof. Therefore, the disclosed methods should be considered from an illustrative rather than a restrictive perspective. The scope of the present invention is indicated by the claims, not the above description, and all differences within the scope equivalent thereto should be interpreted as being included in the present invention.

1a, 1b: Tobacco powder raw materials
2a, 2b: binder
10: Tobacco Granule Core
20: Tobacco granule shell layer
30: Tobacco granules
100, 200, 300: Smoking Items
110, 210, 310: Smoking Substance Section
110a: Smoking Material Wrapper
120: Filter section
120a: Filter wrapper
130: Tip Paper
220, 320: Support structure
230, 330: Cooling structure
240, 340: Mouthpiece section
350: Shear Filter Segment
260, 360: Rapper

Claims (18)

Tobacco granule core formed from the first tobacco powder raw material; and
At least one tobacco granule shell layer formed of a second tobacco powder raw material and layered on the above tobacco granule core,
A tobacco granule, characterized in that the tobacco granule core is formulated with a first binder composed solely of propylene glycol and glycerin. delete In the first paragraph,
Tobacco granules, characterized in that the tobacco granule shell layer is layered with a second binder composed solely of the propylene glycol and the glycerin. In the third paragraph,
Tobacco granules, characterized in that the capacity ratio of the propylene glycol and the glycerin in the first binder is the same as the capacity ratio of the propylene glycol and the glycerin in the second binder. In the third paragraph,
Tobacco granules, characterized in that the ratio of the capacity of the propylene glycol to the capacity of the glycerin in the first binder, or the ratio of the capacity of the propylene glycol to the capacity of the glycerin in the second binder is 6:4 to 8:2. In the third paragraph,
The capacity of the propylene glycol in the first binder is greater than the capacity of the propylene glycol in the second binder,
Tobacco granules, characterized in that the capacity of the glycerin in the first binder is smaller than the capacity of the glycerin in the second binder. In the first paragraph,
Tobacco granules, characterized in that the first tobacco powder raw material and the second tobacco powder raw material are different types of tobacco powder raw materials. In the first paragraph,
The particle size of the above tobacco granule core is 0.2 mm to 0.8 mm,
Tobacco granules, characterized in that the particle size of the above tobacco granules is 0.9 mm to 2.0 mm. A smoking material portion, at least part of which is filled with tobacco granules; and
It includes a filter section located downstream of the above smoking material section,
The above tobacco granules include a tobacco granule core formed from a first tobacco powder raw material, and at least one tobacco granule shell layer formed from a second tobacco powder raw material and layered on the tobacco granule core,
A smoking article, characterized in that at least one of the tobacco granule core and the tobacco granule shell layer is formed with a binder composed solely of propylene glycol and glycerin. In Article 9,
A smoking article, characterized in that it further comprises a front plug located upstream of the smoking material section. A step of forming a tobacco granule core by formulating a first tobacco powder raw material with a binder consisting solely of propylene glycol and glycerin; and
A method for manufacturing tobacco granules, comprising the step of forming at least one tobacco granule shell layer by layering a second tobacco powder raw material on the tobacco granule core. delete In Article 11,
The weight ratio of the first tobacco powder raw material and the capacity of the binder added in the step of forming the tobacco granule core is 1:0.9 to 1:1.1.
A method for manufacturing tobacco granules, characterized in that the capacity ratio of the propylene glycol and the glycerin in the binder is 6:4 to 8:2. In Article 11,
The weight ratio of the second tobacco powder raw material and the capacity of the binder added in the step of forming the tobacco granule shell layer is 1:0.6 to 1:1.
A method for manufacturing tobacco granules, characterized in that the capacity ratio of the propylene glycol and the glycerin in the binder is 6:4 to 8:2. In Article 11,
A method for manufacturing tobacco granules, characterized in that the tobacco granule core is formulated using a top spray process, and the tobacco granule shell layer is layered using a tangential spray process. In Article 15,
The above top spray process is performed for 50 to 70 minutes under the conditions of an internal temperature of 30 to 50°C, an internal pressure of 0.3 to 1.0 bar, and a binder injection pressure of 0.7 to 1 bar.
A method for manufacturing tobacco granules, characterized in that the above tangential spray process is performed for 40 to 60 minutes under conditions of an internal temperature of 30 to 50°C, an internal pressure of 0.3 to 0.5 bar, and a binder injection pressure of 0.7 to 1 bar. In Article 15,
The above top spray process is performed with a first formulation stage of 20 to 30 minutes and a second formulation stage of 30 to 40 minutes after the first formulation stage.
The above tangential spray process is performed with a first layering stage of 20 to 30 minutes and a second layering stage of 30 to 40 minutes after the first layering stage.
The first formulation stage and the first layering stage are performed under conditions where the internal temperature is 20°C to 40°C, the internal pressure is 0.3 bar to 0.5 bar, and the binder injection pressure is 0.7 bar to 0.8 bar.
The second formulation stage is performed under the conditions of an internal temperature of 40°C to 50°C, an internal pressure of 0.5 bar to 1.0 bar, and a binder injection pressure of 0.8 bar to 1.0 bar.
A method for manufacturing tobacco granules, characterized in that the second layering stage is performed under conditions in which the internal temperature is 40°C to 50°C, the internal pressure is 0.3 bar to 0.5 bar, and the binder injection pressure is 0.8 bar to 1.0 bar. In Article 11,
The particle size of the first tobacco powder raw material and the particle size of the second tobacco powder raw material are 0.05 mm to 0.1 mm, and the particle size of the tobacco granule core is 0.2 mm to 0.8 mm.
A method for manufacturing tobacco granules, characterized in that the particle size of the tobacco granules composed of the tobacco granule core and the tobacco granule shell layer is 0.9 mm to 2.0 mm.

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