KR20230096596A - A method of forming a combustible heat source for a smoking article, the combustible heat source manufactured by the method, and a smoking article comprising the same - Google Patents

Abstract

The present invention relates to a method for forming a combustible heat source, comprising the steps of preparing a combustible heat source composition including carbon powder, an organic binder, and an ignition accelerator (S1); treating the combustible heat source composition with glycerin or propylene glycol (S2); and a step (S3) of compressing and molding the composition after the treatment, wherein the compression of step S3 is performed at an intensity of 0.5 to 10 MPa.

Description

A method of forming a combustible heat source for a smoking article, the combustible heat source manufactured by the method, and a smoking article comprising the same the same}

The present invention relates to a method for shaping a combustible heat source for a smoking article, a combustible heat source made by the method, and a smoking article comprising the same.

A number of smoking articles have recently been proposed in which smoking articles are heated rather than combusted. Unlike conventional smoking articles, these non-combustion smoking articles are used by sucking an aerosol generated by heating a smoking article medium without burning the smoking article medium. As one of these types of heated smoking articles, there is a smoking article product to which a carbon heat source is applied.

A smoking article to which the carbon heat source is applied generates an aerosol by heat transfer from the carbon heat source to a smoking article medium located downstream of the carbon heat source.

A smoking article to which a carbon heat source is applied has a smoking form similar to that of a traditional smoking article, unlike general heated electronic smoking articles using a dedicated device, so that consumers' smoking convenience and satisfaction can be improved.

Korean Patent Publication No. 2020-0030364

It is an object of the present invention to provide a method for forming a combustible heat source having excellent combustion sustainability, and a smoking article comprising the combustible heat source and the heat source.

The present invention is a method for forming a combustible heat source,

Preparing a combustible heat source composition including carbon powder, an organic binder, and an ignition accelerator (S1);

treating the combustible heat source composition with glycerin or propylene glycol (S2); and

After the treatment, a step (S3) of compressing and molding the composition,

The step S3 is performed at a pressure of _PO ,

The P _o provides a method for forming a combustible heat source, characterized in that 1.5 to 2 times the strength of compression P _w when water is treated.

In one embodiment of the present invention, the heat source may have a diameter of 7 to 8 mm and a length of 10 to 12 nm.

In another embodiment of the present invention, the intensity of compression of the step S3, P _{o ,} may be an intensity of 0.5 to 10 MPa.

In another embodiment of the present invention, the P _o may be 1.5 to 3 MPa.

In another embodiment of the present invention, the P _w may be 0.5 to 1.5 MPa.

In another embodiment of the present invention, the oil may be treated in an amount of 0.8 to 2 parts by weight based on 100 parts by weight of the solid content of the combustible heat source composition.

In another embodiment of the present invention, the heat source is ignited within 30 seconds, and combustion may continue for 140 seconds or more.

In addition, the present invention provides a combustible heat source formed by the above method.

In addition, the present invention provides a smoking article comprising the combustible heat source.

Conventional combustible heat sources are manufactured by a compression molding method, and there is a limit in that the internal density of the combustible body excessively increases to affect the durability of combustion. Accordingly, the present invention provides an optimal molding method for compression molding in a combination form in which oil/moisture is applied. The heat source molded by the method of the present invention has superior surface roughness compared to conventional heat sources, and accordingly, combustion It is characterized by excellent durability.

1 is a view showing the external appearance of a combustible heat source according to the oil content of the present invention.
Figure 2 is a view showing the results of confirming that the surface is improved by the pressure adjustment of the present invention.

Demand for heated electronic smoking articles is increasing. Most heated electronic smoking articles have a device in the structure of [device + dedicated stick]. As a new type of smoking article, a product having a smoking form similar to that of a general smoking article is developed by applying a carbon-based heat source to the tip of the smoking article. It is becoming. Accordingly, the present invention has attempted to develop a combustible heat source that can have a smoking form (ignition, smoking start point) similar to that of general smoking articles.

Existing combustible carbon heat sources are mainly manufactured by compression molding. It can be manufactured using only powder using the powder molding metallurgy method, but since the internal density of the combustion body may be excessively large, it may affect the combustion continuity, so it is preferable to perform compression molding in the form of oil / moisture applied mixture. Accordingly, in the present invention, a method for forming a combustible heat source according to oil/moisture and mixing pressure is proposed.

Accordingly, the present invention is a method for forming a combustible heat source,

Preparing a combustible heat source composition including carbon powder, an organic binder, and an ignition accelerator (S1);

treating the combustible heat source composition with glycerin or propylene glycol (S2); and

After the treatment, a step (S3) of compressing and molding the composition,

The step S3 is performed at a pressure of _PO ,

The compression strength Po is 1.5 to 2 times the compression strength Pw when water is treated.

Further, the present invention can provide a combustible heat source molded by the above method and a smoking article comprising the heat source.

Hereinafter, the present invention will be described in more detail.

Step S1 of the present invention is a step of preparing a combustible heat source composition. The combustible heat source composition may include carbon powder, an organic binder, and an ignition accelerator. In addition, the heat source composition may further include moisture (water). By including moisture in the heat source composition, it can serve as a binder during compression. The water may be included in an amount of 1 to 1.2% based on the solid content.

Step S2 of the present invention is a step of treating glycerin or propylene glycol as an oil component in order to optimize the internal density of the combustible heat source. Preferably, propylene glycol having better combustion sustainability may be used. The oil may increase the ignition property when heated so that the combustion is better performed.

Step S3 of the present invention is a step of compressing the composition and finally molding it in the form of a heat source.

In the present invention, it was confirmed that the surface roughness of the heat source is greatly improved when a stronger pressing pressure is applied when processing oil compared to when processing water.

Accordingly, the intensity of compression in step S2 was defined as P _o , and the intensity of compression when moisture was treated was defined as P _w . That is, P _o , which is the strength of compression in step S3 of the present invention, may have a value 1.5 to 2 times greater than P _w , which is the strength of compression when water is treated. For example, if the pressure when water is treated is 1.2 MPa, the pressure when oil is treated may be 2.0 MPa.

As another embodiment of the present invention, the P _o may be 0.5 to 10 MPa, and P _w may be 0.5 to 1.5 MPa. Preferably, P _o may be 1.5 to 3.0 MPa to produce a heat source having a diameter of 7 to 8 mm and a length of 10 to 12 nm.

The heat source may be ignited within 30 seconds, and combustion may last for 140 seconds or longer. In the present invention, the size of the heat source is 7 to 8 mm in diameter and 10 to 12 nm in length, and the present invention proposes a preferred method of forming the heat source having the diameter and length. A heat source having a size within the above range has a size suitable for use as a combustible heat source applied smoking article.

As another embodiment of the present invention, the oil may be treated in an amount of 0.8 to 2 parts by weight based on 100 parts by weight of the solid content of the combustible heat source composition. More preferably, it has excellent surface roughness and formability when treated with 1 to 1.5 parts by weight.

Thus, the present invention can provide a combustible heat source manufactured by the above method.

Combustible heat sources for use in smoking articles according to the present invention have a carbon content of at least about 50%. For example, a combustible heat source in smoking articles according to the present invention may have at least about 60 dry weight of the combustible heat source, or at least about 70 dry weight, or at least about 80 dry weight of the combustible carbon-based heat source.

As an embodiment of the present invention, one or more binders may be combined with the heat source. Preferably, the at least one binder is an organic binder. Known suitable organic binders include, but are not limited to, gums (eg guar gum), modified cellulose and cellulose derivatives (eg methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methylcellulose). Contains flour, starch, sugar, vegetable oil and combinations thereof.

Additionally, a combustible heat source for use in smoking articles according to the present invention may include one or more additives to enhance the properties of the combustible heat source. Suitable additives include additives that promote consolidation of the combustible heat source (eg, sintering aids), additives that promote ignition of the combustible heat source (eg, perchlorates, chlorates, nitrates, peroxides, permanganates, zirconium and oxidizing agents, such as combinations thereof), additives that promote combustion of the combustible heat source (e.g., potassium and potassium salts, such as potassium citrate), and additives that promote decomposition of one or more gases produced by combustion of the combustible heat source (eg, potassium citrate). catalysts such as CuO, Fe2O3 and Al2O3).

In addition, the combustible heat source may further include an ignition aid. As used herein, the term 'ignition aid' is used to denote a substance that releases one or both of energy and oxygen during ignition of a combustible heat source, wherein one of the energy and oxygen by the substance or both, the rate of release is not limited by ambient oxygen diffusion. That is, the rate of release of either or both energy and oxygen by a material during ignition of a combustible heat source is largely independent of the rate at which ambient oxygen can reach the material. As used herein, the term 'ignition aid' is also used to denote an elemental metal that releases energy during ignition of a combustible heat source, wherein the ignition temperature of the elemental metal is less than about 500°C and elemental The heat of combustion of metal is at least about 5 kJ/g. The ignition aids are alkali metal salts of carboxylic acids (alkali metal citrate salt, alkali metal acetate salt and alkali metal succinate salt), which are believed to modify carbon combustion. etc.), an alkali metal halide salt (alkali metal chloride salt, etc.), an alkali metal carbonate salt, or an alkali metal phosphate salt.

Examples of suitable oxidizing agents include, but are not limited to, nitrates such as, for example, potassium nitrate, calcium nitrate, strontium nitrate, sodium nitrate, barium nitrate, lithium nitrate, aluminum nitrate and iron nitrate; nitrite; other organic and inorganic nitro compounds; chlorates such as, for example, sodium chlorate and potassium chlorate; perchlorates such as, for example, sodium perchlorate; chlorite; bromate salts such as, for example, sodium bromate and potassium bromate; perbromate; bromite; borates such as, for example, sodium borate and potassium borate; ferrates such as, for example, barium ferrate; ferrite; manganates such as, for example, potassium manganate; permanganates such as, for example, potassium permanganate; organic peroxides such as, for example, benzoyl peroxide and acetone peroxide; inorganic peroxides such as, for example, hydrogen peroxide, strontium peroxide, magnesium peroxide, calcium peroxide, barium peroxide, zinc peroxide and lithium peroxide; superoxides such as, for example, potassium acetate and sodium acetate; iodate; Periodoxate; iodite; sulfate; sulfite; other sulfoxides; phosphate; phospinate; phosphite; and phosphanite.

While advantageously improving the ignition and combustion performance of the combustible heat source, inclusion of ignition and combustion additives can create undesirable decomposition and reaction products during smoking article use. For example, the decomposition of nitrates contained in the combustible heat source to aid ignition allows nitrogen oxides to be formed. Including a combustible heat source in a smoking article according to the present invention advantageously substantially prevents or inhibits decomposition and reaction products from entering the air drawn through the smoking article according to the present invention during its use.

Combustible carbonaceous heat sources for use in smoking articles according to the present invention may be prepared as described in the prior art known to those skilled in the art.

A combustible carbonaceous heat source for use in smoking articles according to the present invention preferably comprises mixing one or more carbonaceous materials with one or more binders and other additives, if included, and preforming the mixture into the desired shape. is formed by The mixture of one or more carbon-containing materials, one or more binders, and optional other additives can be formed into the desired shape using any suitable known ceramic forming methods, such as, for example, slip casting, extrusion, injection molding, and mold pressing. may be pre-formed. In certain preferred embodiments, the mixture is pre-formed into a desired shape by pressing or extruding or a combination thereof.

Preferably, the mixture of one or more carbon-containing materials, one or more binders and other additives is pre-formed into an elongate rod. However, it will be appreciated that the mixture of one or more carbon-containing materials, one or more binders and other additives may be pre-formed into other desired shapes.

In one embodiment of the present invention, the combustible heat source may preferably have a porosity between about 20% and about 80%, more preferably between about 20% and 60%. More preferably, the combustible heat source may have a porosity of between about 50% and about 70%, as measured, for example, by mercury porosimetry or helium pycnometry. The required porosity may be easily achieved during the method of manufacturing the heat source using conventional methods and techniques.

Advantageously, combustible heat sources for use in smoking articles according to the present invention have an apparent density between about 0.6 g/cm3 and about 1 g/cm3.

Preferably, the combustible heat source has a mass between about 300 mg and about 500 mg, more preferably between about 400 mg and about 450 mg.

Preferably, the combustible heat source has a length between about 7 mm and about 17 mm, more preferably between about 7 mm and about 15 mm, and most preferably between about 7 mm and about 13 mm.

Preferably, the combustible heat source has a diameter between about 5 mm and about 9 mm, more preferably between about 7 mm and about 8 mm.

Preferably, the combustible heat source has a substantially uniform diameter. However, the combustible heat source may alternatively be tapered so that the diameter of the rear portion of the combustible heat source is greater than the diameter of its front portion. In such embodiments, the rear portion of the combustible heat source has a transverse cross-sectional area of at least about 60% of the transverse cross-sectional area of the smoking article.

It is particularly preferred that the combustible heat source is substantially cylindrical. The combustible heat source may be, for example, a cylinder or tapered cylinder of substantially circular cross-section or a cylinder or tapered cylinder of substantially elliptical cross-section.

Accordingly, the combustible heat source may be used in a combustible heat source applied smoking article.

The "smoking article" means any smokeable product or smoking experience, whether based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. It can mean any product that can. For example, the smoking article may mean a smokeable article capable of generating an aerosol, such as a cigarette, cigar, or cigarillo.

The smoking article may include a combustible heat source, a medium portion, a thermally conductive wrapper and cigarette paper, a cooling portion, a filter portion, etc. composed of the composition, comprising a combustible heat source; medium unit; cooling unit; And the filter unit may be arranged in order based on the longitudinal direction, but the order can be freely changed except for the case where the combustible heat source is located upstream. In addition to this, additional configurations may be further included or one or more of the above configurations may be omitted. The smoking article may have a diameter of, for example, 4 mm to 10 mm, and a circumference of 14 mm to 29 mm. Also, the length may be 45 mm to 100 mm.

The media portion may include, for example, at least one of cut cut sheath, planar cut sheath, smoking article leaf, puffed smoking article, and nicotine extract. The medium part may contain a nicotine component. In addition to the medium part, an aerosol generating material may be further included. Aerosol-generating substances include polyhydric alcohols, esters of polyhydric alcohols such as glycerol mono-, di- or triacetate, and mono-, di- or esters of polyhydric alcohols such as dimethyl dodecanedioate and dimethyl tetradecanedioate. It may be an aliphatic ester of a polycarboxylic acid. More specifically, for example, at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol may be included. For example, the medium part may include planar cut grass soaked in glycerin. However, this is an example and the present invention is not necessarily limited to the above bar.

The medium portion may have a length between about 5 mm and about 20 mm, more preferably between about 8 mm and about 12 mm. The media portion is surrounded by a paper or other wrapper and may be in the form of a plug or portion containing a material capable of releasing volatile compounds in response to heating. As described above, when the medium part is in the form of a plug or part, the entire plug or part including any wrapper is considered to be the medium part.

The cooling unit may include a cooling material. The cooling unit includes a tubular hollow body with an open end, and may cool airflow passing through the heat source and the medium unit. The cooling unit may be made of a polymer material or a biodegradable polymer material and may have a cooling function. For example, the cooling unit may be paper, cardboard, plastic, such as cellulose acetate, ceramic, and combinations thereof. Additionally, the cooling section may comprise a corrugated sheet of material selected from the group consisting of metal foil, polymeric material, and substantially non-porous paper or cardboard. In certain embodiments, the aerosol cooling element is polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA), and aluminum. It may also include a corrugated sheet of material selected from the group consisting of foils. The cooling unit may have a length of between 5 mm and about 30 mm, more preferably between about 8 mm and about 25 mm, but the length may be freely adjusted in consideration of the temperature of heat generated from a heatable heat source.

The filter unit includes a filter material, and the shape of the filter unit is not limited. For example, the filter unit may be a cylindrical rod or a tube rod having a hollow inside. Alternatively, it may be a recess type rod. If the filter unit is composed of a plurality of segments, at least one of the plurality of segments may be manufactured in a different shape. For example, the filter unit may include, but is not limited to, a fibrous, filament, or filter tow including at least one of polymer, paper, cellulose acetate, activated carbon, and carbon. The filter unit, for example, may have a length of 5 to 20 mm.

In addition to this, a tipping paper in contact with the mouth surrounding the filter material may be further included. The tipping paper may have one or more perforations.

The filter unit may be manufactured to generate flavor. As an example, the flavoring liquid may be sprayed onto the filter material, and a separate fiber coated with the flavoring liquid may be inserted into the filter unit.

The cooling unit and the filter unit may contain an aerosol modifier. For example, one or more of the cooling section, filter section, and tipping paper of smoking articles according to the present invention may comprise one or more aerosol modifiers. Suitable aerosol modifiers include, but are not limited to, flavoring agents; Contains a chemesthetic agent. The flavoring agent is used to describe any substance that, when used, imparts one or both taste or aroma to aerosols generated by tobacco materials and aerosol-generating substances in smoking articles.

In addition, the cigarette paper is composed of cellulose fibers obtained from wood, flax, or other materials, and may be wrapped around a medium part, wrapped around the entire smoking article including the medium part, or wrapped around a part except for a filter part. The base paper of the cigarette paper may have a thickness of about 30 μm to about 100 μm, and a basis weight of the base paper may be about 15 g/m ² to about 80 g/m ² .

Smoking articles according to the present invention may also contain downstream one or more aerosol modifiers that are both flavoring agents and sensory agents. For example, one or more of the cooling portion and filter portion of smoking articles according to the present invention may include menthol or another flavoring agent that provides a cooling object sensory effect.

In addition, the smoking article including the combustible heat source may include a thermally conductive wrapper surrounding the combustible heat source and the medium unit. The thermally conductive wrapper may completely cover the heat source and the medium unit, may partially cover the heat source and the medium unit, or may entirely cover a part of the heat source and the medium unit. The thermally conductive wrapper transfers heat generated from a combustible heat source to the tobacco material, and the wrapper includes a metal foil wrapper such as an aluminum foil wrapper, a steel wrapper, an iron foil wrapper, and a copper foil wrapper; And it may be a metal alloy foil wrapper, and is not limited to the above material as long as it is a material capable of efficiently transferring heat.

A metal barrier may be formed between the heatable heat source and the medium portion. Here, the metal barrier can prevent the combustible heat source unit from directly contacting the medium unit, and can prevent some of components generated in the combustible heat source unit from moving to the medium unit.

The thickness of the barrier can be appropriately adjusted to obtain good smoking performance. In certain embodiments, the barrier may have a thickness between about 10 microns and about 500 microns. The barrier may include one or more metallic materials that are substantially thermally stable and non-combustible at the temperatures obtained by the combustible heat source upon ignition and combustion. Suitable materials are known in the art and include, but are not limited to, aluminum, copper, stainless steel, and combinations thereof.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes can be made to the embodiments, the scope of the patent application is not limited or limited by these embodiments. It should be understood that all changes, equivalents or substitutes to the embodiments are included within the scope of rights.

Terms used in the examples are used only for descriptive purposes and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiment belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

In addition, in the description with reference to the accompanying drawings, the same reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted. In describing the embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description will be omitted.

[Example]

One. Manufacturing of combustible heat sources

According to the composition shown in Table 1 below, a combustible heat source composition including charcoal and an excipient was prepared. The heat source was made in the form of a cylinder with a diameter of 7 mm and a height of about 11 mm. Materials for producing a heat source were prepared according to the mixing ratio and then mixed using an atmospheric pressure mixer (ARE-310 from THINKY). When mixing, each material was mixed at 1500 RPM for 1 minute each time it was added.

The mixed powder was mixed at 1500 RPM for 5 minutes by adding an appropriate amount of moisture or oil in parts by weight shown in Table 1. The mixed sample was divided into about 0.6 g and compressed through a press to form a cylinder shape. At this time, the pressure for compression was the conditions presented in Table 1. In particular, in the case of Examples 2, 3, 5, and 6 in which oil was added, compression was performed at a higher pressure than when water was added.

The compressed sample was dried at 80° C. for 30 minutes in a drying oven.

Solids formulation percentage (%, by weight) Oil and moisture content (parts by weight) enter
(MPa) Charcoal excipient Sum moisture glycerol PG Example 1 70% 30% 100% 0 One 0 2.0 Example 2 0 0 One 2.0 Example 3 0 1.5 0 2.0 Example 4 0 0 1.5 2.0 Comparative Example 1 One 0 0 1.2 Comparative Example 2 1.2 0 0 1.2 Comparative Example 3 0 0.5 0 2.0 Comparative Example 4 0 0 0.5 2.0 Comparative Example 5 0 2 0 2.0 Comparative Example 6 0 0 2 2.0 Comparative Example 7 0 One 0 1.2 Comparative Example 8 0 0 One 1.2

2. Check the formability of the combustible heat source

The appearance of the manufactured heat source was confirmed and shown in FIG. From FIG. 1, good moldability was confirmed when the oil and water content was contained at 1%.

In addition, the results evaluated according to the following criteria are shown in Table 2.

<Surface State>

A: good

B: There are cracks and broken parts on the surface

C: There are many cracks and broken parts on the surface

<Formability>

A: good molding

B: Hardness is weak and has a sticky or crumbly appearance

C: Adheres to the container wall and is not molded

surface state formability Example 1 A A Example 2 A A Example 3 A A Example 4 A A Comparative Example 1 C C Comparative Example 2 C C Comparative Example 3 C B Comparative Example 4 C B Comparative Example 5 B C Comparative Example 6 B C Comparative Example 7 C B Comparative Example 8 C B

As can be seen from the results of Table 2, good surface roughness and moldability were confirmed when the oil content was 1 to 1.5% as in Examples 1 to 4. In comparison, Comparative Examples 1 and 2 containing 1% and 1.2% moisture were found to have slightly poor moldability due to cracking, cracking, and crumbly surfaces during molding, and Comparative Examples 3 and 4 containing 0.5% oil was molded, but the surface was cracked and cracked. Comparative Examples 5 and 6 containing 2% of oil had no cracks on the surface, but were weak in hardness and did not adhere well to the container wall. In addition, the result of being smaller compared to other heat sources in size was also confirmed.

As shown in FIG. 2, it was confirmed that the surface roughness of Example 2 to which a pressure of 2 MPa was applied was greatly improved compared to Comparative Example 8 to which a pressure of 1.2 MPa was applied.

In Comparative Examples 7 and 8 in which the pressure was applied at 2.0 MPa, surface cracking was confirmed, and it can be seen that the surface roughness is greatly improved by increasing the pressure when oil is added compared to the case where water is added thereto.

3. Check combustion results of combustible heat sources

The prepared heat source was ignited and then burned, and the observation results are shown in Table 3 below.

Ignitability Soft water retention/surface burning rate Retain shape after burning Example 1 ○
16s start burning surface burning
(takes 180s) ○ Example 2 ○
14s start burning surface burning
(takes 160s) ○ Example 3 ○
11s start burning surface burning
(takes 150s) ○ Example 4 ○
12s start burning surface burning
(takes 135s) ○ Comparative Example 1 △
40s start burning △
stop burning X Comparative Example 2 X
ignition failure X
ignition failure X Comparative Example 3 △
42s start burning △
large amounts of smoke X Comparative Example 4 X
ignition failure X
(ignition failure) X Comparative Example 5 △30s
start burning
break occurrence △
large amounts of smoke X Comparative Example 6 △30s
start burning
break occurrence △
large amounts of smoke X Comparative Example 7 △20s
start burning △
Cracking Severe smoke generation X Comparative Example 8 △20s
start burning △
Cracking Severe smoke generation X

As can be seen from the results of Table 3, good ignition and combustibility were confirmed when an appropriate pressure was applied and the oil content was 1 to 1.5% as in Examples 1 to 4. In comparison, in the heat source containing moisture, the ignition property was reduced and cracking occurred, and Comparative Examples 3 and 4 containing 0.5% oil did not ignite or started slowly, and the surface cracked and cracked. In addition, Comparative Examples 5 and 6 containing 2% oil were well ignited, but the combustion did not proceed stably due to their small size.

In addition, Comparative Examples 7 and 8 in which the pressure was applied as small as 1.2 MPa were quickly ignited, but the surface was also cracked and smoke generation was severe.

As described above, although the embodiments have been described with limited drawings, those skilled in the art can apply various technical modifications and variations based on the above. For example, the described techniques may be performed in an order different from the method described, and/or components of the described system, structure, device, circuit, etc. may be combined or combined in a different form than the method described, or other components may be used. Or even if it is replaced or substituted by equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

Claims (9)

As a method of forming a combustible heat source,
Preparing a combustible heat source composition including carbon powder, an organic binder, and an ignition accelerator (S1);
treating the combustible heat source composition with glycerin or propylene glycol (S2); and
After the treatment, a step (S3) of compressing and molding the composition,
The step S3 is performed at a pressure of _PO ,
The P _o is 1.5 to 2 times the strength of compression P _w when water is treated, characterized in that, the method of forming a combustible heat source. According to claim 1,
The heat source is
A method for forming a combustible heat source, characterized in that the diameter is 7 to 8 mm and the length is 10 to 12 nm. According to claim 1,
The _PO is a method for molding a combustible heat source, characterized in that 0.5 to 10 MPa. According to claim 3,
The _PO is a method for forming a combustible heat source, characterized in that 1.5 to 3.0 MPa. According to claim 1,
Wherein P _w is 0.5 to 1.5 MPa, characterized in that, the method of forming a combustible heat source. According to claim 1,
The method of forming a combustible heat source, characterized in that the oil is treated in an amount of 0.8 to 2 parts by weight based on 100 parts by weight of the solid content of the combustible heat source composition. Formed by the method of any one of claims 1 to 6, combustible heat source. According to claim 7,
Wherein the heat source is ignited within 30 seconds, and combustion lasts for 140 seconds or more, a combustible heat source. A smoking article comprising the combustible heat source of claim 7 .

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