TW200301086A - Smoke article - Google Patents

Abstract

Disclosed is a smoke article (10) which has a cylinderical body (11) and a flavor generator (15) The fore end and the rear end are respectively provided with a heating element (13) and a foot (17) The flavor generator (15) is disposed near the heating element (13) within the cylinderical body (11). The flavor generator (15) contains plural particles (151) comprising an inorganic filler being sustaintially nonporous of 65-93% by mass, a binder of 1-3% by mass and a flavor substance of 6-32% by mass, on the ratio of dry mass basis.

Description

200301086 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a smoking article, more specifically, 1 to a smoking article having a scent generating body that generates scent by means of addition but not by combustion 〇 [Prior art] It is well known that various types of smoking articles that can enjoy the flavor and smoke of cigarettes without burning tobacco leaves have been proposed. ○ For example, Japanese Patent Publication No. 63 — 3 5 4 6 • Japanese Patent Publication No. 6 — 4 6 8] L8, Japanese Patent No. 168] .67, Japanese Patent No. 30] L 2 2 5 3 λ Japanese Patent Publication No. 2 — 8 4 1 6 4 A typical example of a smoking article that uses the heat generated by a heating element mounted on the front end to generate a scent is disclosed. These smoking articles are filled, for example, in a granular or sheet form, between the heating element and the suction element. When the flavor generating body is heated by the heat of the hair bun member, the flavor generating body will be vaporized and the flavor components will be released. As for the flavor generating body, various molded articles such as non-flammable porous materials or cigarette raw materials are proposed. Among the porous materials, a large amount of energy is required to vaporize or dissipate the flavored substances adsorbed inside, so there may be a risk that the vaporization efficiency will be reduced or the flavored substances will be thermally deformed. In addition, when a volatile substance of cigarette materials is used as a substrate It will actually cause ρχ burn or thermal decomposition.1 So the phenomenon of volatility is very unstable, which may have an adverse effect on the amount of aroma sent. 0 This type of smoking articles also occurs. The amount of aroma generated is easily affected by the condition of the hairpin. The fundamental problem is that carbon is the main raw material in heating components Shaped into fuel elements based for the most prevalent use by Miao; and often in

1 314279.pui Page 7 200301086 V. Description of the invention (2) During the period from ignition to the first half of smoking, the maximum amount of heat will occur, and then the amount of heat will gradually decrease until the flameout is uneven. Therefore, the amount of fragrance produced by this heat has the same phenomenon, especially the maximum amount of fragrance and the amount in the second half of smoking can be quite different. Therefore, when the stomach user smokes, there is a problem that he / she feels stress due to an uneven change in the amount of smoke or taste, which leads to a decrease in satisfaction. On the other hand, in Japanese Patent Application Laid-Open No. 5-277191, it is disclosed that in order to deliver a certain quality of flavor, a fuel member and a flavor generating body that has a predetermined number of smokings are formed and bonded into a plate-shaped smoking article. In order to adhere the combustion member and the aroma generating body or insulating intermediary, the temperature of the combustion member will be lowered, making the combustion difficult to continue, so there is a risk of extinguishing it halfway, and because the aroma generating body is often heated, it is unnecessary. Heating may cause deterioration of quality. In addition, because it is necessary to match the burning speed of the combustion member and the timing of smoking, it is impossible to multiply the smoking time according to the user's preference. This not only increases the pressure of the smoker, but also has a complicated structure and is extremely difficult to manufacture. The present invention has been developed in view of the above-mentioned problems, and an object thereof is to provide a simple structure and a stable amount of flavor in each mouthpiece of a user during smoking, without causing uneven changes in the amount of smoke or taste. And feel 1 彳 pressure, 俾 smoking goods can enjoy the pleasure of smoking. [Summary of the Invention] In order to solve the above-mentioned problem, the present invention provides a smoking article comprising: a cylindrical body provided with a heating element at a front end portion and a mouthpiece portion at a rear end portion; and the cylindrical body. Scent is placed close to the heating element

314279.ptd Page 8 V. Description of the invention (3) body; It is characterized in that the aroma generating system is composed of a plurality of granules, and the granules include: based on dry mass (ie, not including The proportion of the state of moisture), 65 to 93% by mass of a substantially non-porous inorganic filler; 1 to 3% by mass of a binder; and 6 to 32% by mass of a fragrance substance. The inorganic filler of the present invention preferably has a BET specific surface area of 3 m 2 / g or less, and more preferably calcium carbonate. The granular material is filled in the most dense state, and the ratio of the filling length of the granular material in the axial direction of the cylindrical body to the inner diameter of the cylindrical body is preferably in the range of 2 to 4, and the cylindrical body The ratio of the inner diameter of the shaped body to the representative diameter of the granules is preferably 4 to 15. Pellets can be in the form of pellets, flakes, or spheres. The binder of the present invention preferably contains fluorenyl hydroxyethyl cellulose. In an ideal aspect of the present invention, the heating element has a thermal conductivity of 1.0 W / m · K or less at normal temperature. The heating element is preferably composed of a carbonaceous material containing 15 to 65% by mass of a substantially non-porous inorganic filling material; the inorganic filling material contained in the heating element is preferably composed of 3 m V g The following BET specific surface area is composed of calcium carbonate. 'The mouthpiece of the smoking article of the present invention is composed of a filter (f i 11 e r) with a filtration rate of 20% or less, or a hollow filter. [Embodiment] Hereinafter, the present invention will be described in detail. The smoking article of the present invention is a so-called non-combustible smoking article which prevents the aroma generating body from burning, and has the following characteristics:

314279.ptd Page 9 00301086 V. Description of the invention (4) The heat is used to heat and emit a flavor generating body of flavor components. The flavor generating body has a specific composition and is provided in the cylindrical body. A heating element is provided at a front end portion of the cylindrical body, and a suction port portion is formed at a rear end portion of the cylindrical body. " Fig. 1 is a schematic cross-sectional view showing a structural example of a smoking article of the present invention. The smoking article 10 shown in Fig. 1 includes a cylindrical body 11 for forming a smoking article body. A heating element 13 is provided at a front end portion of the cylindrical body 11, and a suction port 17 is formed at a rear end portion of the cylindrical body. The scent-generating body 15 of the present invention is provided in the cylindrical body 1 1 close to the heating body 13. _ Generally, the cylindrical body 11 is cylindrical, and is preferably made of a material having a high heat stability such as aluminum and stainless steel. In addition, in order to reduce the heat capacity, it is preferable to reduce the thickness to, for example, 0 to 0 3 Bandit to 0 · 1 leg thickness. The cylindrical body 11 can have an inner diameter of about 7 mm to 8 sides and a length of about 8 Omni to 120 mm, like a general cigarette. Generally speaking, the outer side of the cylindrical body 1 1 is integrally / wrapped by the heat insulating material 12 so that the hand can be conveniently held.的 The flavor generating body 15 used in the smoking article of the present invention is composed of a plurality of coarse objects 1 51, and the granular material 15 1 includes: based on dry mass, 65 to 93% by mass Is a substantially non-porous inorganic filler; 1 to 3% by mass of a binder; and 6 to 32% by mass of a substance. Stomach aroma substances include substances that generate aerosol (aleroso 1) by heating with the heat generated by an ignited heating element (alcohols, sugars, "water"), or substances that only produce aroma (menthol, caffeine) , Natural extracts & substances), cigarettes, cigarette extracts, mixtures of these, etc. For alcohols, for example, glycerol (g 1 yceri η), propylene glycol (pr pypy 1 ene) can be used

314279.pid Page 10 200301086 V. Description of the invention (5) gl y co]), and mixtures of these. One of the components of the flavor generating body 15 is a substantially non-porous inorganic filler with a BET specific surface area of 3 μm or less and less than or equal to Vg. It is a “good” active anneal, alumina beads, silica, and other ceramics. So-called porous materials with numerous fine pores, such as molecular sieves, have the property of absorbing other substances by adsorption or absorption inside them. In smoking articles such as the smoking articles of the present invention, it is effectively used to increase If the fragrance substance 5 is inhaled in the holes of the substrate during the release of the fragrance, in addition to the energy required for the fragrance substance to evaporate, it is necessary to remove the fragrance substance 5 from the hole. This will not only reduce the vaporization efficiency, but also -^ In terms of continuous addition of 埶 in the hole, the problem of thermal denaturation is also prone to occur. In the present invention, the fragrance substance is kept only substantially The interstices of the base material particles formed by the inorganic filler of the substance do not cause the above-mentioned problems of porous substances, and by adding 敎 4, the fragrance can be easily released from the fragrance generating body 15, which is substantially non-porous. For porous inorganic fillers, carbonic acid 'particles with a BET specific surface area of less than 3 m: Vg are particularly suitable. Alternatively, cigarette raw materials or substitute plant raw materials and their extracts can be used to form granular shaped products. It is easy to cause combustion or thermal decomposition if it is added.5 Because of the unstable thermal phenomenon, it is easy to cause %% / uneven flavor, and because it is porous, it may also cause the problem of fragrance thermal denaturation. It is included in the fragrance generation of the present invention. Cellulose Λ or various cellulose derivatives alginic acid (a 1 gi] 1 i (: 1 ac id), Accounting port opening leaf bean gum Dayton gum (X a n t h e] 1 e gum), barbed square block bean gum, especially the use of 5-yl Yue ethyl group ,, a fiber element (me · thylhydroxy ethyl

314279.pid Page 11 00301086 V. Description of the invention (6) celluiose), not only can improve the retention of flavor substances, but also provide good cigarette flavor. The more the amount of the mixture, the greater the physical strength of the formed article. ^ ^ ^ 'The adhesive will have an adverse effect on the aroma when heated at high temperature, so ^ ^ n /, /, if it does not interfere with the processing, A small amount is preferable within a range of 1 to 3% by mass. The granular ^ y — <formed article] constituting the flavor generating body of the present invention is obtained by mixing the non-porous inorganic filling material, the binder and the flavoring substance in the above ratio, and then adding the binder. The amount of water suitable for the generation of cohesive force • Then use extruding and forming a, granulators, ingots, etc. to form: the size and shape of Λ. Therefore, the 'granule' can be shaped into a pellet, a sheet, or a sphere. As shown in FIG. 1 ', between the heat generating body 13 and the flavor generating body 15, a breathable heat-resistant member 16a such as a metal mesh is provided so that the odor generating body i 5 does not directly contact the heat generating body 13 . θ Limbs: In the smoking article of the present invention, the heat generating tube 1 3 provided at the front end of the cylindrical body 1 i may be formed of a carbonaceous material such as carbon. The carbonaceous material can be formed into a desired shape using an extruder or the like. The shape of the carbonaceous formed body: J ί 困 Column. The heating system inhales through the mouth, #air is heated from the outside 2'm 3, and the person enters the inside of the cylindrical body 11, and the heat generated by the heating body 13 is inserted into the two holes / melon through the granules of the fragrance generating body 15 There are 1 to 5 empty passages to taste the way. For example, + μ # &lt; $, s produces citrons into 7 knives, and the air p path with air circulation J is arranged along the outside of a greedy round branch shaped body RI "only opposite to U and square; Along the length of the cylindrical body "or mouth, or by the axis, the sapphire hates at least one of the cylindrical shaped bodies

200301086 V. Description of the invention (7) Consisting of through-holes. In FIG. 1, for such a flow path, a central through-hole 1 31 · that penetrates the heating element 13 in the axial direction, and a plurality of through-holes provided around the through-hole 1 31 ( In the figure, the through-holes 132 and 133 are shown. The shape of the air flow path (the depth of the groove and the diameter of the through-holes) and the number of the heating elements 1 and 3, as well as the type or composition of the carbonaceous material, will affect the heating element. Combustion characteristics such as ignition time, combustion speed, combustion temperature, and amount of combustion products are affected. In particular, in terms of lighting time characteristics, it is required that the user does not feel inconvenient to use when lighting a general cigarette (within about 1 second). It can be known from the present invention that the ignition time of the carbonaceous formed body within about 1.5 seconds can be selected by the composition of the carbonaceous material so that the thermal conductivity at normal temperature (about 2 2 ° C) becomes 1. 〇W / m · 1 (hereinafter. Furthermore, according to the present invention, a heating element is formed by a carbonaceous material composition (the remainder is carbon) containing a substantially non-porous inorganic filler in a proportion of 15 to 65% by mass, Can substantially reduce the carbon content, and further reduce the amount of combustion products, especially carbon monoxide, while reducing the amount of combustion (ie, the number of cigarettes), can also reduce the total amount of combustion products. It is essentially non-porous For inorganic fillers, carbonates with a BET specific surface area of 3 m 2 / g or less are particularly suitable. The heat generated by the combustion of the heating element 13 heats the aroma generating element 15 adjacent to the heating element, and The scent is vaporized and released. Generally, the heating element 13 is surrounded by a heat-resistant surrounding member 14 and is inserted and fixed in the cylindrical body 1 1. The cylindrical body 11 can be used for the fragrance The downstream side of the generating body 15 is arranged with a fragrance Complementary body 18. The fragrance supplementary body 18 is produced by the aroma generating body 1 5

mm i m 314279.pid page 13 ⑽b ------- V. In addition to the flavor components described in the invention, 7 β $ is made of raw cigarettes: Yake can be made of glutinous body according to the purpose. If you go again, you can also put spices on the paper, no; 2, again, and green. In addition, the fragrance supplement 18 may also contain scented materials such as He 2 cloth, etc. When the fragrance characteristics are exposed to high temperature, up to 4 ^ can be planted. It can be used according to the purpose of the shape of the mouthpiece, and the filter used for π and 17 can usually be provided in the technical field-generally used # ^ For the amount of cigarettes produced, in the end: #, cigarette rf ·! +, 堙 之 曰 味 置, you can use the filtration rate of 20% to γ also 1 ^ i:, r), or hollow filter &quot; except for the mouth horse or suction pressure under the mouthpiece 17A, according to It takes 7 in order to adjust the suction in the circumferential direction), 八 * 冲 王] cursed k 鲛 as the suction port π Λ,) scallop shell heat insulation material 12 and cylindrical g to form several ventilation holes VH. The limbs 1 1 are in accordance with the present invention, 'Although the aroma generating body 15 and the aroma supplementary carving! Ding and righteousness are matched with the chanting ... Jinri Budu brother limbs 1 8 series can be set with gaps =,' !: As shown in Fig. 1 'It is the smoke generated in the body 15 of the two = the gap 19, which can promote ... to produce body irritation ... cold ... reduce the amount of loss. The volume of the void portion 19 can be determined by the amount of ^, η field. As shown in FIG. 1, in this way, at the position 3 ^ &quot; 1 β 4 ', a breathable member having the same heat resistance a as the heat generating element 6b can be provided at the downstream end of the flavor generating body 15 to make the granular material 15丨 Will not move. In the present invention, when the granules within 1 1 and 1 5 1 are filled with the densest packing 1 t # 田 粒 物 151 is loosely filled, it will form a bias during use. Can't move the h &amp; and t charge-like evils. In this way, the fluid formed between the particles 1 5 1

W 314279.ptd Page 14 00301086 V. Description of the invention (9) The flow path will also shift and the averageness of the fragrance delivery amount will be impaired. Therefore, it is advisable to form the most dense filling and maintain the initial filling state. Here, the most dense filling means: by shaking or tapping the granular object to form a dense filling state. Here, it can be seen that the filling length (L) of the most densely packed granular material 1 5 1 and the inner diameter (D) of the cylindrical body 1 1, the ratio (L / D) of the two is set to 2 to 4 The range is appropriate. When the ratio is less than 2, the phenomenon that fragrance components are generated by the fragrance generating body 15 tends to be easily affected by the heating method of the heating body 13; on the other hand, when the ratio is greater than 4, the body Condensation and sedimentation tends to reduce the amount of scent sent, and meanwhile, the averageness of scent sent also tends to decrease. Therefore, when the inner diameter (D) of the tubular body 11 is the same as that of a normal cigarette, when the length is about 7 to 8 legs, the filling length (L) is preferably set to a range of about 14 to 3 2 mra. In addition, it can be seen that the size of the granular material 151, which represents the ratio (D / d) of the diameter (d) to the inner diameter (D) of the cylindrical body 1 1 is set to be 3.5 to 16, especially A range of 4 to 15 is appropriate. When the ratio is less than 4, because the heat capacity of a granular material 1 51 will increase, the amount of fragrance emitted at the beginning of inhalation will tend to decrease; further, when the ratio is more than 15, the resistance to attraction will increase, Therefore, it is difficult to inhale. Therefore, when the inner diameter (D) of the cylindrical body 11 is the same as that of a normal cigarette, when the representative diameter of the granular material is about 7 to 8 legs, the diameter of the granular material is preferably set to a range of about 2.0 to 0.5 mra. Here, the representative diameter of the granular material means the longest diameter in the axial direction or the radial direction. Hereinafter, the present invention will be described based on examples, but the present invention is not limited thereto.

314279.pld Page 15 00301086 V. Explanation of the invention (10) (Confirmation example 1) Figures 2A and 2B show the use of calcium carbonate with a BET specific surface area lm2 / g as a non-porous inorganic filler, and DSC analysis results when Γ (Figure 2A) is mixed with a scent substance; and when aluminum with a BET specific surface area of 120 m2 / g &lt; is used as the porous inorganic filler, and mixed with the scent substance at the same ratio (Figure 2B) ) DSC analysis results. As shown in Fig. 2A, when a non-porous non-organic filling material is used, the endothermic peak due to the vaporization of the fragrance substance appears only once. In contrast, as shown in Fig. 2B, a polyisocyanate is used. When filling the material, in addition to an endothermic peak (endothermic peak (1)), a second endothermic peak (endothermic peak (2)) appears in the high temperature region. This system indicates that in order to vaporize the scent substance adsorbed on the porous substance, more energy is required. It can be seen that the use of a non-porous substance is advantageous. Example 1) 'J Structure of the smoking article shown in Figure 1 Cylindrical body> Material: Aluminum foil laminated paper Length: 8.5 (D): 7.5mm <fragrance generator> Composition: Carbonated fishing 80 with a BET specific surface area of 1 m 2 / g Mass% belongs to fluorenyl hydroxyethyl cellulose 1 mass%, glycerin (flavor substance) 19 mass% Shape: spherical

314279.pld Page 16 200301086 V. Description of the invention (11) Representative diameter (d): 1 · 5πιη The most dense filling length (L): 1 5mm L / D = 2 D / d = 5 <Scent supplement> Composition ： Yellow tobacco shred length: 20 mm <suction mouth> filter

Length: 2 0_ <heating body> Composition: Carbon 8 5 mass% Carbonic acid # 5 1 5 mass% BET specific surface area 1 m 2 / g <Gap portion> Length: 15mra About this smoking article, use an automatic smoking machine to The cigarettes were smoked at a capacity of 50 m L / 2 seconds every 30 seconds. The measurement results of the mass of cigarettes collected by each cigarette are shown in Fig. 3. Also, the average index (described later) of the flavor components emitted from the smoking article of this example was 0.79. The total collected amount of scent is about 1 lmg. (Example 2) In addition to setting the most dense filling length of the particles constituting the flavor generating body to 30 mm (L / D = 4; no void portion), and the representative diameter of the particles was set to 1. Except for 0mm (D / d = 7.5), other parts are the same as in Example 1.

314279.ptd Page 17 200301086 V. Description of the invention (12) Same, and the same smoking article as in Example 1 was prepared. About this smoking article, smoking was performed using an automatic smoking machine at a capacity of 50 mL / 2 seconds per cigarette every 30 seconds, and the measurement results of the mass of the cigarette collected by each cigarette are shown in Fig. 4. The average index value of the smoking article in this embodiment is as high as 0.81. However, if L / D is made large, the total amount of scented substances will be reduced compared to the previous example and will be about 7 mg. The average index of the above embodiment uses the measured values of the 2nd to 11th cigarettes and is calculated in the following way: Average index 2 1-(coefficient of variation) Coefficient of variation 2 (standard deviation) / (average value) The average index indicates that the closer to 1, the better. Fig. 5 is a graph showing the results of graphing the heat flow from the carbon shaped product heating element to the flavor generating element in each smoking article in the smoking article of Example 1; The evaluation range of the average index is based on the 2nd to 11th cigarettes, 50% of the maximum amount of heat flowing into the aroma generating body (approximately the 5th cigarette)

I or higher is a condition. (Example 3) ^ Except that the content of calcium carbonate in the heating element was set to 40 mass ° / ◦, the pipe parts were the same as in Example 1, and the same smoking as in Example 1 was made, and then, the same Perform a smoking operation. As a result, the amount of carbon monoxide generation was reduced to 5% in the case of Example 1. (Comparative Example 1) f When the flavor generating body is heat-resistant and flammable, the filling state changes due to combustion, and the amount of flavor generated by the heat of combustion

314279.ptd Page 18 200301086 V. Description of the Invention (13) The surge has caused the heating phenomenon of the heating element itself to become more uneven. The sheet-shaped tobacco shredded medium composed of a slurry (pu 1 p) and 1: a reeling material described in Japanese Patent Application Laid-Open No. 6-4 6 8 1 8 will contain 40% by mass of flavoring substances. The flavor generating body (for example, glycerin) was filled to a length of about 3 Omni, and the same smoking article as in Example 2 was prepared. The measurement results of the mass of the flavor collected in each cigarette are shown in FIG. 6. The total collected amount of the fragrance substance was about 13 mg. Although there was no great difference from Example 1, the average index was as low as 0.31. Furthermore, when the smoking article after the smoking is opened, the ashing and burning of the plate-like tobacco shreds can be seen.

(Example 4)

A specially trained smoking taste panel (p a n e 1 ist) was used to actually smoke the smoking articles of Examples 1 and 2, and the smoking articles of Comparative 1 and compare them. As a result, the smoking articles of Examples 1 and 2 of the present invention have a stable amount of scented smoke per cigarette. In particular, the amount of scent does not decrease when the second half of the cigarette is smoked. Therefore, smoke can be obtained when smoking is performed. Evaluation of high sense of volume. In addition, in the smoking article of Comparative Example 1, when the second half of the cigarette was smoked, a special change in smoke taste was generated due to the burning of the aroma generating body. As described above, according to the present invention, the object is to provide a simple structure, and when a user smokes, each cigarette can send out a stable amount of fragrance without causing pressure due to uneven changes in the amount of smoke or taste,吸烟 Smoke items that you can enjoy smoking.

314279.ptd Page 19 00301086 Brief description of drawings [Simplified description of drawings] Fig. 1 is a schematic cross-sectional view showing a smoking article according to a first embodiment of the present invention. Figures 2A and 2B are graphs showing the results of DSC analysis when a substantially non-porous non-porous filler and a porous inorganic filler are used as the inorganic filler when mixed with a flavoring substance. Fig. 3 is a graph showing the quality of the flavor of each cigarette in the smoking article of Example 1 described later in detail. Fig. 4 is a graph showing the quality of the flavor of a cigarette in the smoking article of Example 2 described later. Fig. 5 is a graph showing the amount of heat that flows from the carbon shaped product heating element to the flavor generating element in each smoking article in the smoking article of Example 1; ^ Fig. 6 is a graph showing the smoking article of Comparative Example 1 described in detail later, and the quality of the flavor of each cigarette was collected. 10 Smoking articles 12 Insulating material surrounding member 1? Heat-resistant member 17 Inhalation portion 19 Void portion 1 5 1 Granular VH vent 11 Tubular body-13 Heating body 15 Aroma generating body 1 6 b Ventilating member 18 Aroma Supplements 131, 132, 133 Through holes 1 7 1

314279.ptd 苐 page 20

Claims (1)

00301086 6. Scope of patent application 1. A smoking / smoke article comprising: a cylindrical body provided with a heating element at a front end portion and a suction mouth portion at a rear end portion; and provided close to the heating body in the cylindrical body. The flavor generating body is characterized in that the flavor generating system is composed of a plurality of granules, and the granule system comprises: based on the dry mass, 65 to 93% by mass, which is substantially non-porous. High-quality inorganic filler; 1 to 3% by mass of a binder; and 6 to 32% by mass of a fragrance substance. 2. The smoking article according to item 1 of the patent application scope, wherein the inorganic filler has a specific surface area of B E T of 3 m 2 / g or less. 3. For the smoking article in the scope of the patent application, the inorganic filling material is carbonic acid. 4. The smoking article according to item 1 of the patent application range, wherein the granular material is filled in the most dense state, and the filling length of the granular material in the axial direction of the cylindrical body is the same as that of the cylindrical body. The ratio of the inner diameter is in the range of 2 to 4, and the ratio of the inner diameter of the cylindrical body to the representative diameter of the granular material is in the range of 4 to 15. 5. The smoking article according to item 1 of the scope of patent application, wherein the granules are in the form of pellets, flakes, or balls. 6. The smoking article according to item 1 of the patent application scope, wherein the adhesive comprises fluorenyl hydroxyethyl cellulose. 7. The smoking article according to item 1 of the patent application scope, wherein the heating element has a thermal conductivity of 1. OW / m · K or less at normal temperature. 8. The smoking article according to item 1 of the scope of patent application, wherein the heating element is composed of a substantially non-porous inorganic material containing a proportion of 15 to 65% by mass. 314279.ptd Page 21 00301086 VI. Scope of Patent Application Filled with carbonaceous material. 9. The smoking article according to item 1 of the scope of patent application, wherein the inorganic filler contained in the heating element is composed of calcium carbonate having a BET specific surface area of 3 m2 / g or less. 10. The smoking article according to item 1 of the scope of patent application, wherein the mouthpiece portion is composed of a filter (f i 11 e r) having a filtration rate of 20% or less. 1 1. The smoking article according to item 1 of the scope of patent application, wherein said mouthpiece portion is composed of a hollow filter. 314279.pid Page 22