Method for producing a combustible heat source for smoking articles and smoking articles containing the same

Abstract

The present invention provides a method for producing a combustible heat source for a smoking article, comprising step S1 of mixing carbon powder and an organic binder, step S2 of adding a sugar aqueous solution to produce a combustible heat source composition for a smoking article after step S1, step S3 of adding an oil to the composition, and step S4 of compressing the composition. The composition contains a sugar aqueous solution to eliminate the surface cracking phenomenon during combustion of the heat source, and a smoking article for a combustible heat source made of the composition is characterized by excellent ignition and combustibility.

Description

[Technical field]

[0001] The present invention relates to a method for producing a combustible heat source for a smoking article, a combustible heat source produced by said method, and a smoking article containing the same. [Background technology]

[0002] In recent years, many smoking articles have been proposed that are heated rather than burned. Unlike conventional smoking articles, such non-combustion smoking articles do not burn the medium of the smoking article, but are used by inhaling the aerosol generated by heating the medium of the smoking article. One type of such heated smoking article is a smoking article product that uses a carbon heat source.

[0003] Smoking articles to which the carbon heat source is applied generate aerosol by heat transfer from the carbon heat source to a medium in the smoking article located downstream of the carbon heat source.

[0004] Unlike typical heated electronic smoking articles which use dedicated devices, smoking articles using a carbon heat source have a smoking style similar to that of traditional smoking articles, and are expected to improve the convenience and satisfaction of smoking for consumers.

[0005] Prior art documents Patent Literature (Patent Document 1) Korean Patent Publication No. 2020-0030364 Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present invention is to provide a method for producing a combustible heat source which reduces flame generation and surface cracking during combustion and at the same time has excellent ignition properties and combustion durability, and a smoking article containing said heat source. [Means for solving the problem]

[0007] The present invention provides a method for producing a combustible heat source for a smoking article, comprising step S1 of mixing carbon powder and an organic binder, step S2 of adding a sugar aqueous solution after step S1 to produce a combustible heat source composition for a smoking article, step S3 of adding an oil to the composition, and step S4 of compressing the composition.

[0008] In one embodiment of the present invention, the sugar solution may be contained in the composition in an amount of 5 to 15% by weight.

[0009] In another embodiment of the present invention, the sugar water solution may be prepared by mixing sugar and water in a weight ratio of 7:3 to 5:5.

[0010] In a further embodiment of the present invention, the sugar may be one or more sugar alcohols selected from the group consisting of sorbitol, xylitol, mannitol, maltitol, lactitol, erythritol, reduced palatinose, and reduced starch syrup.

[0011] In a further embodiment of the present invention, the ignition accelerator may further include potassium nitrate.

[0012] In a further embodiment of the present invention, the carbon powder may include charcoal and graphite.

[0013] In a further embodiment of the present invention, the organic binder may be at least one selected from the group consisting of carboxymethyl cellulose (CMC), guar gum, methyl cellulose (MC), and hydroxypropyl methyl cellulose (HPMC).

[0014] In a further embodiment of the present invention, the heat source may be ignited within 30 seconds and combustion may be sustained for 140 seconds or more.

[0015] The present invention also provides a smoking article comprising a combustible heat source formed from the composition. Effect of the Invention

[0016] Conventional flammable heat sources have the limitation that they are difficult to ignite because the main component is charcoal. However, the present invention uses a sugar solution to facilitate ignition of the flammable heat source, and the heat source made of the composition of the present invention is characterized by having improved ignition and combustibility compared to conventional heat sources. [Brief description of the drawings]

[0017] [Figure 1] FIG. 13 shows the results of confirming the combustion process when a heat source of an embodiment containing a sugar solution is burned. [Diagram 2] FIG. 13 shows the results of confirming the combustion process when a heat source containing solid sugar is burned in a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Demand for heated electronic smoking articles is increasing. Many heated electronic smoking articles are equipped with a device in a structure of [device + dedicated stick], and products with a smoking pattern similar to that of general smoking articles have been developed as new smoking articles by applying a carbon-based heat source to the tip of the smoking article. Here, the present invention attempts to develop a combustible heat source with a smoking pattern (ignition, smoking start point) similar to that of general smoking articles.

[0019] In order to improve the ignition ability of conventional combustible heat sources, the present invention uses an ignition accelerator composed of potassium nitrate / sugar. When mixing the materials in a combustible carbon heat source, it was confirmed that the mixture was not uniform due to the use of a small amount of powder-form potassium nitrate / sugar compared to the carbon powder that is mainly used, which caused problems during combustion. To prevent this, the present invention applies a small amount of oil / water to the carbon heat source and applies sugar in the form of a sugar water solution to distribute it evenly inside the combustion body, which confirmed that the problems that occur during combustion can be solved, and the present invention was completed.

[0020] Here, the present invention provides a method for producing a combustible heat source that has excellent ignition properties and burning durability due to the addition of sugar, and at the same time, the sugar is evenly blended so that there is no flame scattering phenomenon and stable burning is possible, as well as a combustible heat source produced thereby and a smoking article containing the same.

[0021] Here, the present invention provides a method for producing a combustible heat source for a smoking article, comprising step S1 of mixing carbon powder and an organic binder, step S2 of adding a sugar aqueous solution after step S1 to produce a combustible heat source composition for a smoking article, step S3 of adding oil to the composition, and step S4 of compressing the composition.

[0022] The present invention also provides a combustible heat source for a smoking article, produced by the above method.

[0023] Further, a smoking article can be provided that includes the combustible heat source.

[0024] The present invention will now be described in more detail.

[0025] The combustible heat source composition of the present invention is characterized by including carbon powder and an organic binder, and adding a sugar aqueous solution to the composition. In general heat source manufacturing, carbon powder is used, and the remaining materials are also solid phase components. However, by using a sugar aqueous solution in the present invention, the sugar is evenly distributed in the heat source, which allows stable combustion.

[0026] Preferably, the sugar water solution in the composition may be contained at 5 to 15% by weight, and more preferably, at 5 to 10% by weight so as to have an ignition time of 30 seconds or less and a burn duration of about 3 minutes.

[0027] The sugar solution is prepared by mixing sugar and water in a weight ratio of 7:3 to 5:5, and it is preferable that the amount of sugar is more than that of water or that the amount of sugar is equal to that of water, and more preferably, the sugar solution is prepared by mixing sugar and water in a weight ratio of 6:4 so that the sugar and water are evenly distributed.

[0028] The sugar is a sugar alcohol, such as sorbitol, xylitol, mannitol, maltitol, lactitol, erythritol, reduced palatinose, or reduced starch syrup. Preferably, mannitol, which has low hygroscopicity, is used when used as a heat source.

[0029] The ignition accelerator may be sugar and potassium nitrate, and the potassium nitrate may be contained in an amount of 5 to 15% by weight.

[0030] The charcoal is used as a fuel to ignite and maintain combustion as a main material of the heat source. The charcoal is preferably contained in an amount of 40% by weight or more relative to 100% by weight of the solid content, and by containing 40% by weight or more, the temperature required for smoking can be maintained for 3 minutes or more.

[0031] In the present invention, a heat source can be produced by adding a polyhydric alcohol as an oil to the composition. By adding the polyhydric alcohol, it is possible to vaporize the heat source into a combustible form after ignition, thereby improving ignition ability and combustion durability. The polyhydric alcohol assists combustion and may be glycerin or propylene glycol. The polyhydric alcohol can be used in an amount of 1 to 5 parts by weight per 100 parts by weight of solids. When used in the above range, it has excellent ignition ability and combustion durability, and more preferably, when used in an amount of 1 to 3 parts by weight, it can achieve rapid ignition and stable combustion.

[0032] The heat source can be ignited within 30 seconds and the combustion can be sustained for 140 seconds or more. The heat source having the ignition time and combustion time can be, but is not limited to, 5 to 10 mm in diameter and 8 to 15 nm in length.

[0033] In one embodiment of the present invention, the heat source may be combined with one or more binders. Preferably, the one or more binders are organic binders. Suitable known organic binders include, but are not limited to, carboxymethylcellulose (CMC), guar gum, methylcellulose (MC), hydroxypropylmethylcellulose (HPMC), and combinations thereof.

[0034] Additionally, the combustible heat source for use in the smoking article of the present invention may include one or more additives to improve the properties of the combustible heat source. Suitable additives include, but are not limited to, additives that promote consolidation of the combustible heat source (e.g., sintering aids), additives that promote ignition of the combustible heat source (e.g., oxidizers such as perchlorates, chlorates, nitrates, peroxides, permanganates, zirconium and 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 (e.g., catalysts such as CuO, Fe2O3 and Al2O3).

[0035] The combustible heat source may further include an ignition aid. As used herein, the term "ignition aid" is used to refer to a material that releases energy and / or oxygen during ignition of the combustible heat source, where the rate of release of energy and / or oxygen by the material is not limited by ambient oxygen diffusion. That is, the rate of release of energy and / or oxygen by the material during ignition of the combustible heat source is nearly independent of the rate at which ambient oxygen reaches the material. As used herein, the term "ignition aid" is used to refer to an elemental metal that releases energy during ignition of the combustible heat source, where the ignition temperature of the elemental metal is less than about 500° C. and the heat of combustion of the elemental metal is at least about 5 kJ / g. The ignition aid may be an alkali metal salt of a carboxylic acid (such as alkali metal citrate salts, alkali metal acetate salts and alkali metal succinate salts), an alkali metal halide salt (such as alkali metal chloride salts), an alkali metal carbonate salt or an alkali metal phosphate salt, which are considered to modify carbon combustion.

[0036] Examples of suitable oxidizing agents include, but are not limited to, nitrates such as potassium nitrate, calcium nitrate, strontium nitrate, sodium nitrate, barium nitrate, lithium nitrate, aluminum nitrate, and iron nitrate; nitrites; other organic and inorganic nitro compounds; chlorates such as sodium chlorate and potassium chlorate; perchlorates such as sodium perchlorate; chlorite; bromates such as sodium bromate and potassium bromate; perbromates; bromides; borates such as sodium borate and potassium borate; ferrates such as barium ferrate; ferrites; manganates such as potassium manganate; permanganates, for example, potassium permanganate; organic peroxides, for example, benzole peroxide and acetone peroxide; inorganic peroxides, for example, hydrogen peroxide, strontium peroxide, magnesium peroxide, calcium peroxide, barium peroxide, zinc peroxide, and lithium peroxide; superoxides, for example, potassium superoxide and sodium superoxide; iodates; periodates; iodites; sulfates; sulfites; other sulfoxides; phosphates; phospinates; phosphites; and phosphanites.

[0037] While advantageously improving the ignition and burn performance of the combustible heat source, the inclusion of the ignition and burn additive may produce undesirable decomposition and reaction products during use of the smoking article. For example, nitrates included in the combustible heat source may decompose to form nitrogen oxides to assist in ignition. Including a combustible heat source in a smoking article according to the present invention advantageously substantially prevents or reduces the decomposition and reaction products from entering the air drawn through the smoking article according to the present invention during use.

[0038] Combustible carbon paper 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.

[0039] Combustible carbon paper heat sources for use in smoking articles according to the present invention can be preferably prepared by mixing one or more carbon-containing materials with one or more binders and other additives (if included) and preforming the mixture into a desired shape. The mixture of one or more carbon-containing materials, one or more binders, and optional other additives may be preformed into a desired shape using any suitable known ceramic forming method, such as, for example, slip casting, extrusion, injection molding, and die compression. In certain preferred embodiments, the mixture is preformed into a desired shape by pressing or extrusion or a combination thereof.

[0040] Preferably, the mixture of one or more carbon-containing materials, one or more binders, and other additives is preformed into an elongate rod, however, it will be understood that the mixture of one or more carbon-containing materials, one or more binders, and other additives may be preformed into any other shape desired.

[0041] In one embodiment of the present invention, the combustible heat source may have a porosity of between about 20% and about 80%, more preferably between about 20% and about 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 can be readily achieved during the manufacturing process of the heat source using conventional methods and techniques.

[0042] Advantageously, the combustible heat source for use in a smoking article according to the present invention has a viscosity of about 0.6 g / cm 3 and about 1g / cm 3 It has an apparent density between and.

[0043] Preferably, the combustible heat source may have a mass between about 300 mg and about 500 mg, more preferably between about 400 mg and about 450 mg.

[0044] Preferably, the combustible heat source may have 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.

[0045] 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.

[0046] Preferably, the combustible heat source has a substantially uniform diameter. However, the combustible heat source may alternatively be tapered such that the diameter of the rear portion of the combustible heat source is greater than the diameter of the front portion. In such embodiments, the rear portion of the combustible heat source has a transverse cross-sectional area that is at least about 60% of the transverse cross-sectional area of ​​the smoking article.

[0047] It is particularly preferred that the combustible heat source is substantially cylindrical, for example it may be substantially cylindrical or tapered cylindrical of circular cross section, or substantially cylindrical or tapered cylindrical of elliptical cross section.

[0048] Here, the combustible heat source can be used in a smoking article for applying a combustible heat source.

[0049] The term "smoking article" refers to any product that can be smoked or that can provide a smoking experience, whether based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. For example, the term "smoking article" refers to any smokable article that can generate aerosol, such as cigarettes, cigars, stubby cigars, etc.

[0050] The smoking article may include a combustible heat source, a medium part, a thermally conductive wrapper and cigarette paper, a cooling part, a filter part, etc., which may be arranged in the longitudinal direction of the smoking article, but the order may be freely changed, except that the combustible heat source is located upstream. In addition, the smoking article may further include additional components, or one or more of the above-mentioned components may be omitted. The smoking article may have a diameter of 4 mm to 10 mm, and a circumference of 14 mm to 29 mm, for example. The length may be 45 mm to 100 mm.

[0051] The medium may include at least one of, for example, shredded grass, shredded grass sheets, tobacco leaves, puffed tobacco, and nicotine extract. The medium may include a nicotine component. In addition to the medium, an aerosol-generating substance may be further included. The aerosol-generating substance may be a polyhydric alcohol, an ester of a polyhydric alcohol such as glycerol mono-, di-, or triacetate, and an aliphatic ester of a mono-, di-, or polycarboxylic acid such as dimethyl dodecanedioate and dimethyl tetradecanedioate. More specifically, the medium may include at least one of, for example, glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol. For example, the medium may include shredded grass sheets immersed in glycerin. However, this is merely an example and the present invention is not necessarily limited thereto.

[0052] The media section may have a length between 5 mm and about 20 mm, more preferably between about 8 mm and about 12 mm. The media section may be in the form of a plug or section that is surrounded by a paper or other wrapper and contains a material capable of releasing a volatile compound in response to heating. As noted above, when the media section is in the form of a plug or section, the entire plug or section, including any wrappers, is considered to be the media section.

[0053] The cooling section may include a cooling material. The cooling section may include a tubular hollow body with open ends, and may cool the airflow passing through the heat source and medium section. The cooling section is made of a polymeric material or a biodegradable polymeric material and has a cooling function. For example, the cooling section may be paper, paperboard, plastic, such as cellulose acetate, ceramic, and combinations thereof. Furthermore, the cooling section may include a wrinkled sheet of a material selected from the group consisting of metal foil, polymeric material, and substantially non-porous paper or paperboard. In certain embodiments, the aerosol cooling element may include a wrinkled sheet of a material selected from the group consisting of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA), and aluminum foil. The cooling section has a length 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 the heat generated by the heating heat source, etc.

[0054] The filter portion includes a filter material, and the shape of the filter portion is not limited. For example, the filter portion may be a cylindrical rod, or a tube-type rod including a hollow portion. Or, the filter portion may be a resin-type rod. If the filter portion 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 portion may include, but is not limited to, a fiber or filament including at least one of polymer, paper, cellulose acetate, activated carbon, and carbon, or a filter tow including these two. The filter portion may have a length of 5 to 20 mm, for example.

[0055] In addition, a tipping paper may be included that contacts the opening that encases the filter material, and the tipping paper may be formed with one or more perforations.

[0056] The filter unit may be manufactured to generate a flavor. For example, a flavoring liquid may be sprayed onto the filter material, or separate fibers coated with the flavoring liquid may be inserted into the filter unit.

[0057] The cooling section and the filter section may include an aerosol modifier. For example, one or more of the cooling section, the filter section, and the tipping paper of the smoking article of the present invention may include one or more aerosol modifiers. Suitable aerosol modifiers include, but are not limited to, flavoring agents; chemesthetic agents. The flavoring agent is used to describe any substance that imparts one or all of a taste or aroma to the aerosol generated by the tobacco material and the aerosol-generating material of the smoking article in use.

[0058] The cigarette paper is made of cellulose fibers obtained from wood, flax or other materials, and is used to wrap the medium, wrap the smoking article including the medium, or wrap the smoking article except for the filter. The thickness of the base paper of the cigarette paper may be about 30 μm to about 100 μm, and the weight of the base paper is about 15 g / m. 2 ~about 80g / m 2 may be also possible.

[0059] A smoking article according to the present invention may include one or more aerosol modifiers downstream that are both flavorants and object-sensing agents. For example, one or more of the cooling portion and the filter portion of a smoking article according to the present invention may include menthol or a further flavoring agent that provides a cooling object-sensing effect.

[0060] In addition, a smoking article including a combustible heat source may include a thermally conductive wrapper that encases the combustible heat source and the medium portion. The thermally conductive wrapper may completely encase the heat source and the medium portion, encase a part of the heat source and a part of the medium portion, or encase a part of the heat source and the entire medium portion. The thermally conductive wrapper transfers heat generated from the combustible heat source to the material of the smoking article, and the wrapper may be a metal wheel wrapper, such as an aluminum foil wrapper, a steel wrapper, an iron wheel wrapper, and a copper wheel wrapper, and a metal alloy wheel wrapper, and is not limited to the above materials as long as the material can transfer heat efficiently.

[0061] A metal barrier may be formed between the heating heat source and the medium portion. Here, the metal barrier can prevent the combustible heat source portion from coming into direct contact with the medium portion, and can prevent a portion of the components generated in the combustible heat source portion from migrating to the medium portion.

[0062] The thickness of the barrier can be appropriately adjusted to obtain good smoking performance. In certain implementations, 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 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.

[0063] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. However, various modifications may be made to the embodiments, and the scope of the patent application is not limited or restricted by the embodiments. It should be understood that all modifications, equivalents, or alternatives to the embodiments are included in the scope of the patent.

[0064] In the embodiments, the terms used are merely used for the purpose of explanation and are not to be construed as being limiting. A singular expression includes a plural expression unless the context clearly indicates otherwise. In this specification, the terms "include" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, and should be understood as not precluding the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0065] Unless otherwise defined, 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 present invention belongs. Commonly used predefined terms should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted as ideal or overly formal unless expressly defined in this specification.

[0066] In the following, the embodiments will be described in detail with reference to the accompanying drawings. In the description with reference to the drawings, the same components are given the same reference numerals regardless of the reference numerals, and the duplicated description thereof will be omitted.

[0067] [Embodiment] 1. Production of flammable heat sources A combustible heat source composition containing charcoal, binder, and sugar was prepared according to the composition shown in Table 1 below. The heat source was manufactured in the form of a cylinder with a diameter of 7 mm and a height of about 11 mm. The materials for manufacturing the heat source were prepared according to the mixing ratio and then mixed using an atmospheric mixer (ARE-310 by THINKY). Each material was added during mixing and mixed at 1500 RPM for 1 minute.

[0068] The mixed powder was mixed at 1500 RPM for 5 minutes with the addition of an appropriate amount of oil (PG) in the weight parts shown in Table 1. The mixed sample was divided into approximately 0.6 g portions and pressed through a press to form a cylinder shape.

[0069] The pressed samples were dried in a drying oven at 80° C. for 30 minutes.

[0070] [Table 1] Sugar solution 1-sugar:water=6:4 Sugar solution 2 - sugar:water=7:3 Sugar solution 3-sugar:water=5:5 Sugar solution 4-sugar:water=4:6

[0071] 2. Confirmation of combustion results of flammable heat sources The prepared heat source was ignited and burned, and the observation results are shown in Table 2 below.

[0072] [Table 2]

[0073] As can be seen from the results in Table 2, when the compositions are as in the embodiments 1 to 5, good ignition and combustion properties were confirmed (FIG. 1). However, when sugar was included in the ratios of 7:3 and 5:5, slight boiling phenomenon was confirmed on the surface.

[0074] In comparison, as shown in FIG. 2, in Comparative Example 1 using solid sugar, the sugar boiling phenomenon and the phenomenon of flames shooting out were observed on the surface.

[0075] In addition, in the case of Comparative Example 2, in which a sugar aqueous solution with a high water content was used, the mixture burned well, but the start of combustion was delayed and the surface combustion took too long.

[0076] In addition, in Comparative Example 3, in which a 3% sugar solution was used, the start of combustion was delayed and surface combustion continued for a long time, while in Comparative Example 4, in which a 20% sugar solution was used, ignition was good, but sugar boiling and explosion were observed.

[0077] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the present invention is not limited to the above-described embodiments, and a person having ordinary skill 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 that described, and / or the components of the described systems, structures, devices, circuits, etc. may be combined or combined in a form different from that described, or may be replaced or substituted by other components or equivalents, and still achieve appropriate results.

[0078] Accordingly, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

Claims

1. Step S1 of mixing carbon powder and an organic binder; After the step S1, a step S2 of adding an aqueous sugar solution to prepare a composition of a combustible heat source for a smoking article; Step S3 of adding oil to the composition; A step S4 of compressing the composition; A method for producing a combustible heat source for a smoking article, comprising:

2. The method for producing a combustible heat source for a smoking article according to claim 1, wherein the composition contains 5 to 15% by weight of the sugar water solution.

3. The method for producing a combustible heat source for a smoking article according to claim 1, wherein the sugar solution is produced by mixing sugar and water in a weight ratio of 7:3 to 5:

5.

4. The method for producing a combustible heat source for smoking articles according to claim 1, wherein the sugar in the sugar solution is one or more sugar alcohols selected from the group consisting of sorbitol, xylitol, mannitol, maltitol, lactitol, erythritol, reduced palatinose, and reduced starch syrup.

5. The method for producing a combustible heat source for a smoking article according to claim 1, wherein the composition further comprises potassium nitrate as an ignition promoter.

6. The method for producing a combustible heat source for a smoking article according to claim 1, wherein the carbon powder contains charcoal and graphite in an amount of 40% by weight or more.

7. The method for producing a combustible heat source for smoking articles according to claim 1, wherein the organic binder is one or more selected from the group consisting of carboxymethyl cellulose (CMC), guar gum, methyl cellulose (MC), and hydroxypropyl methyl cellulose (HPMC).

8. A combustible heat source produced by the method for producing a combustible heat source for smoking articles according to any one of claims 1 to 7.

9. 10. The combustible heat source of claim 8, wherein the combustible heat source is ignited within 30 seconds and combustion is sustained for 140 seconds or more.

10. A smoking article comprising the combustible heat source of claim 9.

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