阅读说明：本技术 烘烤物、烘烤物的制作方法及烘烤物的微波加热方法 (Baked article, method for producing baked article, and method for microwave heating of baked article ) 是由 周宏明 张蛟 金鹤 肖俊杰 于 2019-09-23 设计创作，主要内容包括：本发明涉及一种烘烤物、烘烤物的制作方法及烘烤物的微波加热方法,其中,烘烤物包括烟草和微波吸收剂,烟草和微波吸收剂均能够吸收微波进行发热,微波吸收剂由介电损耗常数稳定、非挥发性的固体材料制成,微波吸收剂用于稳定地吸收微波进行发热,进而对烟草进行传导性加热。本发明的烘烤物、烘烤物的制作方法及烘烤物的微波加热方法,通过在烟草中添加微波吸收剂,微波吸收剂能够稳定地吸收微波进行发热,烟草除本身吸收微波发热外,还会被微波吸收剂通过热传导加热,在微波辐射和热传导的双重加热机制下,烟草的升温更加稳定均匀,温度能继续上升至有效烘烤温度,不仅能实现快速抽吸的功能,还能够热解挥发出独特烟熏香,而获得适宜口感。(The invention relates to a baked object, a manufacturing method of the baked object and a microwave heating method of the baked object, wherein the baked object comprises tobacco and a microwave absorbent, both the tobacco and the microwave absorbent can absorb microwaves to generate heat, the microwave absorbent is made of a non-volatile solid material with a stable dielectric loss constant, and the microwave absorbent is used for stably absorbing microwaves to generate heat so as to conduct heating on the tobacco. According to the baked article, the manufacturing method of the baked article and the microwave heating method of the baked article, the microwave absorbent is added into the tobacco, the microwave absorbent can stably absorb microwaves to generate heat, the tobacco absorbs the microwaves to generate heat and is heated by the microwave absorbent through heat conduction, the temperature of the tobacco is more stably and uniformly increased under a dual heating mechanism of microwave radiation and heat conduction, the temperature can be continuously increased to the effective baking temperature, the rapid smoking function can be realized, and the unique smoke incense can be pyrolyzed and volatilized to obtain the proper taste.)

1. A baked matter comprising tobacco and a microwave absorber, wherein the tobacco and the microwave absorber can absorb microwaves to generate heat, the microwave absorber is made of a solid material with a stable dielectric loss constant and non-volatility, the dielectric loss constant of the microwave absorber does not change along with temperature change, the dielectric loss constant of the microwave absorber is higher than that of lignocellulose in the tobacco, and the microwave absorber is used for stably absorbing microwaves to generate heat so as to conductively heat the tobacco.

2. The roaster of claim 1, wherein the microwave absorber is one or more of ceramic powder, inorganic non-metallic simple substance, ferrite type absorber and metal powder.

3. The baked good of claim 2, wherein the ceramic powder comprises one or more of silicon carbide, silicon nitride and aluminum nitride in any combination;

the inorganic nonmetal simple substance comprises one or any combination of more of coke, carbon powder and graphite powder; the ferrite-type absorber comprises Fe₃O₄；

The metal powder comprises one or any combination of Ti, Fe and Ni metal powder.

4. The roaster as claimed in claim 1, wherein the microwave absorbent is uniformly distributed in the tobacco, and the particle size of the microwave absorbent is in the range of 2 μm to 200 μm.

5. The roaster of claim 1, wherein the microwave absorbent to tobacco volume ratio ranges from 1% to 30%.

6. The roaster of claim 1, wherein the microwave absorbent has a thermal conductivity higher than that of the tobacco.

7. The baked good of any one of claims 1-6, wherein the baked good is a tobacco rod comprising a tobacco section, a filter section and a microwave filter membrane; the tobacco portion comprises the tobacco and a microwave absorbent; the microwave filter membrane is arranged on the filter part or between the filter part and the tobacco part.

8. The roaster of claim 7, wherein the microwave filtering membrane is a metal sheet, the metal sheet is provided with a first through hole, the air flow can flow through the first through hole, the metal sheet is used for reflecting the microwave and preventing the microwave from leaking, and the first through hole is used for cutting off the transmission of the microwave.

9. A process for the preparation of the baked goods according to any of claims 1 to 6, comprising the steps of:

crushing a tobacco raw material into a first component;

step two, adding additives into the first component, uniformly mixing to obtain a second component, mixing microwave absorbent powder into the second component, and uniformly mixing to obtain a third component; or adding the microwave absorbent and the additive into the first component, and uniformly mixing to obtain a fourth component;

and step three, molding and shaping the third component or the fourth component.

10. The method for preparing the baked goods according to claim 9, wherein the additive in the second step comprises one or more of an acidity regulator, a leavening agent, a humectant, a stabilizer/coagulant, a thickener and a natural essence.

11. A method of microwave heating of a baked good according to any of claims 1 to 6, comprising the steps of:

s1: the microwave generator emits microwaves to heat the baked objects;

s2: the tobacco and the microwave absorbent absorb microwaves to generate heat, and the microwave absorbent heats the tobacco again through heat conduction.

12. The microwave heating method of the baked goods as claimed in claim 11, further comprising a temperature control step S3: the temperature detecting unit detects the temperature of the baked objects and sends the detection result to the circuit control unit, and the circuit control unit controls the working power of the microwave generator to further control the heating temperature of the baked objects.

Technical Field

The invention relates to the field of microwave heating, in particular to a baked object, a manufacturing method of the baked object and a microwave heating method of the baked object.

Background

The non-combustion heating technology is a method for roasting a specific roasted object (such as cigarette) by low-temperature heating without combustion to generate smoke, so that a user can smoke the smoke.

Traditional low temperature baking equipment is mainly that to the heating element circular telegram, heating element produces the heat through the joule effect, heating element and the thing (tobacco) direct contact that toasts to toast the tobacco with heat transfer, this mode has preheating time length, and the cigarette toasts inhomogeneous problem, and tobacco utilization efficiency is low.

The microwave heating is realized by utilizing the continuous polarization of a heating substance in a microwave electromagnetic field, dipoles inside the heating substance reciprocate along with high frequency to generate dielectric loss (similar to internal friction) for heating, and the microwave heating has the characteristics of high heating rate and capability of simultaneously heating all parts of a baked object, and can solve the problems of long preheating time and poor cigarette baking uniformity in an electric heating mode. However, the conventional tobacco rod heated by the general microwave heating device cannot effectively heat the baked material to the target temperature, and the tobacco is difficult to effectively bake to obtain a proper taste.

Disclosure of Invention

Accordingly, it is necessary to provide a baked article, a method for manufacturing the baked article, and a method for heating the baked article by microwave, which are directed to the problem that the conventional baked article such as a cigarette cannot be effectively heated to a target temperature when being heated by microwave.

The baked matter comprises tobacco and a microwave absorbent, wherein both the tobacco and the microwave absorbent can absorb microwaves to generate heat, the microwave absorbent is made of a solid material with stable dielectric loss constant and non-volatility, the dielectric loss constant of the microwave absorbent does not change along with temperature change, the dielectric loss constant of the microwave absorbent is higher than that of lignocellulose in the tobacco, and the microwave absorbent can stably absorb microwaves to generate heat so as to conduct conductive heating on the tobacco.

In one embodiment, the microwave absorbent is one or any combination of ceramic powder, inorganic nonmetal simple substance, ferrite absorbent and metal powder.

In one embodiment, the ceramic powder comprises one or any combination of silicon carbide, silicon nitride and aluminum nitride; the inorganic nonmetal simple substance comprises one or any combination of more of coke, carbon powder and graphite powder; the ferrite-type absorber comprises Fe₃O₄(ii) a The metal powder comprises one or any combination of Ti, Fe and Ni metal powder.

In one embodiment, the microwave absorbent is uniformly distributed in the tobacco, and the particle size of the microwave absorbent ranges from 2 μm to 200 μm.

In one embodiment, the volume ratio of the microwave absorbent to tobacco ranges from 1% to 30%.

In one embodiment, the microwave absorbent has a thermal conductivity higher than that of the tobacco.

In one embodiment, the baked goods are cigarette rods, and the cigarette rods comprise tobacco parts, filter parts and microwave filter membranes; the tobacco portion comprises the tobacco and a microwave absorbent; the microwave filter membrane is arranged on the filter part or between the filter part and the tobacco part.

In one embodiment, the microwave filtering membrane is a metal sheet, the metal sheet is provided with a first through hole, the gas flow can flow through the first through hole, the metal sheet is used for reflecting microwaves and preventing the microwaves from leaking, and the first through hole is used for cutting off the transmission of the microwaves.

The invention also provides a preparation method of the baked product, which comprises the following steps: crushing a tobacco raw material into a first component; step two, adding additives into the first component, uniformly mixing to obtain a second component, mixing microwave absorbent powder into the second component, and uniformly mixing to obtain a third component; or adding the microwave absorbent and the additive into the first component, and uniformly mixing to obtain a fourth component; and step three, molding and shaping the third component or the fourth component.

In one embodiment, the additive in the second step includes one or more of an acidity regulator, a leavening agent, a humectant, a stabilizer/coagulant, a thickener and a natural essence.

The invention also provides a microwave heating method of the baked object, which comprises the following steps: s1: the microwave generator emits microwaves to heat the baked objects; s2: the tobacco and the microwave absorbent absorb microwaves to generate heat, and the microwave absorbent heats the tobacco again through heat conduction.

In one embodiment, the microwave heating method of the baked goods further includes a temperature control step S3: the temperature detecting unit detects the temperature of the baked objects and sends the detection result to the circuit control unit, and the circuit control unit controls the working power of the microwave generator to further control the heating temperature of the baked objects.

The baked object, the manufacturing method of the baked object and the microwave heating method of the baked object have the advantages that:

according to the baked article, the manufacturing method of the baked article and the microwave heating method of the baked article, the microwave absorbent is added into the tobacco, the microwave absorbent can stably absorb microwaves to generate heat, the tobacco absorbs the microwaves to generate heat and is heated by the microwave absorbent through heat conduction, the temperature of the tobacco is more stably and uniformly increased under a dual heating mechanism of microwave radiation and heat conduction, the temperature can be continuously increased to the effective baking temperature, the rapid smoking function can be realized, and the unique smoke incense can be pyrolyzed and volatilized to obtain the proper taste.

Drawings

FIG. 1 is a schematic diagram of a cigarette according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a microwave heating device according to an embodiment of the present invention.

Fig. 3 is a schematic diagram illustrating an electrical connection relationship between electronic components in the microwave heating apparatus according to an embodiment of the present invention.

Reference numerals:

the cigarette 100, the filter tip part 110, the microwave filter membrane 120, the first through hole 121, the tobacco part 130, the tobacco 131 and the microwave absorbent 132; the microwave oven comprises a shell 210, an air channel hole 211, a charging interface 212, a power supply 220, a circuit control unit 230, a microwave generator 240, an accommodating cavity 250, a second through hole 251, a main control switch 260, a display screen 270, a microwave power control button 280 and a microwave transmission channel 290; a temperature detection unit 400.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

When the traditional baked goods such as cigarettes are heated by microwave, the baked goods are difficult to be effectively baked to the target temperature, so that the proper mouthfeel is difficult to obtain. The specific reasons are found through research that the common frequency of microwave heating is 2.45GHz, and the heating power of a unit volume material under the action of a microwave field is P ═ 2 pi f epsilon₀Epsilon 'tan delta/E/2, wherein f is the microwave frequency, and epsilon' tan delta is the dielectric loss constant of the material; epsilon₀Is a vacuum dielectric constant; e is the microwave electric field strength, so the microwave heating is closely related to the material dielectric loss constant and the microwave electric field strength. The cigarette mainly comprises lignocellulose, part of water, and additives such as glycerol and spice, and during the tobacco baking process, there are mainly water, glycerol, nicotine and plant volatile substances volatilization, and part of the tobacco volatile substancesPyrolysis of cellulose and lignin. The tobacco can be rapidly heated up in the initial stage of microwave heating, wherein the dielectric loss constants of moisture (dielectric loss constant is 10-20) and glycerin are higher, but the temperature rises, along with the volatilization of the moisture and the glycerin, the dielectric loss constant of lignocellulose is very small, the temperature rise rate is rapidly reduced, and even the temperature cannot be continuously raised, so that the traditional baked goods such as cigarettes and the like cannot be effectively heated to the target temperature when being heated by microwaves, and the target temperature is usually 250-400 ℃ according to the design of the tobacco.

In one embodiment, the baked goods is a cigarette 100, as shown in fig. 1, the cigarette 100 includes a filter tip part 110, a microwave filter membrane 120 and a tobacco part 130, the tobacco part 130 includes tobacco 131 and a microwave absorbent 132, the tobacco 131 is the same as the tobacco 131 in the conventional low-temperature baked cigarette 100, both the tobacco 131 and the microwave absorbent 132 can absorb microwaves to generate heat, the microwave absorbent 132 is made of a solid material with stable dielectric loss constant and non-volatility, the microwave absorbent 132 can stably absorb microwaves to generate heat, and then conductively heat the tobacco 131, and the temperature of the tobacco 131 can rise to an effective baking temperature under the dual heating of microwave radiation and heat conduction.

The microwave absorber 132 has a relatively stable dielectric loss constant, and the term "relatively stable dielectric loss constant" as used herein means that the microwave absorber is generally in a solid state, does not volatilize, does not undergo a chemical reaction, does not change in dielectric loss constant with temperature, and can stably absorb microwaves to generate heat. The microwave absorbent 132 can be ceramic powder (such as silicon carbide, silicon nitride, aluminum nitride) in granule or sheet form, inorganic nonmetal simple substance (such as coke, carbon powder, graphite powder), ferrite absorbent (such as Fe₃O₄) And even metal powder (such as Ti, Fe, Ni, etc.), the microwave absorbent 132 is added during the tobacco sheet reconstruction process, so as to be uniformly distributed among the tobacco 131. The microwave absorbent 132 may be one of the above ceramic powder, inorganic nonmetal simple substance, ferrite absorbent, and metal powder, or may be a mixture of a plurality of them. The dielectric loss constant of microwave absorbers is generally higher than the dielectric loss of the lignocellulose in tobaccoHigh dielectric loss constants, e.g., silicon carbide in the range of about 0.02 to 0.2, graphite in the range of 0.01 to 0.2, and lignocellulose generally in the range of 1 x 10^-3The following.

The mixing of the microwave absorbent 132 with the tobacco 131 is not a common mechanical mixing, but is incorporated during the reconstitution process of the tobacco 131. In one embodiment, the method of making a tobacco 131 article generally comprises the steps of: firstly, crushing a tobacco 131 raw material into a first component; step two, adding required additives into the first component obtained in the step one, and uniformly mixing to form a second component, wherein the required additives mainly comprise an acidity regulator, a swelling agent, a humectant, a stabilizer/coagulant, a thickening agent, natural essence and the like; mixing the microwave absorbent 132 powder in the second component, and then uniformly mixing to obtain a third component; or adding the microwave absorbent 132 and the additive into the first component, and mixing uniformly to obtain a fourth component; and step three, molding and forming the third component or the fourth component by adopting a coating, pressure casting or thermoplastic mode. By the preparation method of the tobacco 131 product, the microwave absorbent 132 can be uniformly mixed in the tobacco 131, and uniform conductive heating of the tobacco 131 is facilitated.

The particle size of the microwave absorbent 132 is mainly considered for portability of the tobacco 131, and is too large to be easily incorporated into the tobacco sheet, so that, in one embodiment, the microwave absorbent 132 ranges from 2 μm to 200 μm, preferably from 2 μm to 50 μm, and the volume ratio of the microwave absorbent 132 to the tobacco 131 ranges from 1% to 30%. In addition, under normal conditions, the heat conductivity coefficient of the microwave absorbent 132 powder is higher than that of the tobacco 131, and the microwave absorbent 132 is added into the tobacco 131, so that the heat conductivity coefficient of the whole cigarette 100 can be improved, and the temperature uniformity of the cigarette 100 after being heated is further promoted.

After the cigarette 100 containing the microwave absorbent 132 is placed in the microwave heating device, the tobacco 131 in the tobacco part 130 absorbs the microwave to generate heat, and is also heated by the microwave absorbent 132 through heat conduction, and the temperature rise of the tobacco 131 is more stable and uniform under the dual heating mechanism of microwave radiation and heat conduction; in the process of volatilizing moisture, glycerin and the like in the tobacco 131 material, the microwave absorbent 132 can provide stable conductive heating, so that the temperature of the tobacco 131 can be continuously raised to the effective baking temperature, and unique smoke incense is volatilized through pyrolysis, so that a proper taste is obtained.

The main function of the microwave filter membrane 120 is to prevent the microwave from leaking from the filter portion 110, and the location may be in the middle of the filter portion 110 or at the boundary between the filter portion 110 and the tobacco portion 130, and in the embodiment shown in fig. 1, the microwave filter membrane 120 is located in the filter portion 110. In one embodiment, as shown in fig. 1, the microwave filtering membrane 120 is a metal sheet or a metal sheet, a plurality of first through holes 121 are disposed on the metal sheet or the metal sheet, the first through holes 121 enable airflow to flow normally when the cigarette 100 is smoked, the metal material can reflect microwaves to prevent the microwaves from leaking, and the first through holes 121 can cut off transmission of the microwaves to play a role in shielding.

In one embodiment, the microwave heating device for heating the cigarette 100 is shown in fig. 2, and mainly comprises a housing 210, and a power supply 220, a circuit control unit 230, a microwave generator 240 and a containing cavity 250 which are arranged in the housing 210. Wherein, the accommodating cavity 250 is used for accommodating the cigarette 100 containing the microwave absorbent 132; the microwave generator 240 is used for generating microwaves, which are then used for heating the cigarette 100 in the receiving cavity 250. The structure of the electrical connection between the electronic components in the microwave heating device is shown in fig. 3, and it can be seen from fig. 3 that the circuit control unit 230 is electrically connected with the microwave generator 240 for controlling the operation of the microwave generator 240; the power supply 220 is electrically connected to the circuit control unit 230 for providing power to the microwave heating device.

In one embodiment, as shown in fig. 2, the microwave heating device further includes a smoking set main control switch 260, a display screen 270, a microwave power control button 280, a temperature detection unit (not shown in fig. 2), a charging interface 212, and an air passage hole 211 on the housing 210, wherein the air passage hole 211 is in communication with the accommodating cavity 250. The electrical connection relationship among the electronic components in the microwave heating device is shown in fig. 3, and the smoking set main control switch 260 is electrically connected with the power supply 220 or the circuit control unit 230 and is used for starting the microwave generator 240 to work; the display screen 270 is electrically connected with the circuit control unit 230 and is used for displaying the working power of the microwave generator 240 and/or the temperature in the accommodating cavity 250; the microwave power control button 280 is electrically connected to the circuit control unit 230, and is used for adjusting and controlling the operating frequency of the microwave generator 240; the temperature detection unit 400 is electrically connected with the circuit control unit 230, and is used for detecting the temperature of the cigarettes 100 in the accommodating cavity 250 and sending the detected temperature to the circuit control unit 230; the charging interface 212 is electrically connected to the power supply 220, and is used for charging the power supply 220 in the microwave heating device.

In a specific embodiment, as shown in fig. 2, the microwave generator 240 is a magnetron capable of generating microwaves with a frequency of 2.45GHz, and a microwave transmission channel 290 is further disposed between the microwave generator 240 and the receiving cavity 250, and the microwave transmission channel 290 is used for transmitting the microwaves generated by the microwave generator 240 to the receiving cavity 250. The accommodating cavity 250 is a cylindrical microwave resonant cavity, the accommodating cavity 250 may be made of a metal material, or may be made of a high temperature resistant organic material such as ceramic or polytetrafluoroethylene, but the inner side of the accommodating cavity 250 must include a metal reflective layer to allow microwaves to oscillate and propagate in the accommodating cavity 250 back and forth, a plurality of second through holes 251 are formed in the bottom of the accommodating cavity 250 to facilitate the entry of air flow during the pumping process, and the suction resistance can be adjusted, and the air passage hole 211 in the shell 210 of the microwave heating device is communicated with the accommodating cavity 250 through the second through holes 251. After the cigarette 100 is inserted into the accommodating cavity 250 of the microwave heating device, the accommodating cavity 250 and the microwave filtering membrane 120 in the cigarette 100 can form a microwave closed cavity, once the microwave generator 240 is started, the microwave oscillates back and forth in the accommodating cavity 250 to heat the tobacco part 130 (including the tobacco 131 and the microwave absorbent 132) in the cigarette 100, so that the tobacco part of the cigarette 100 is heated to a proper temperature, and proper smoke is generated by baking and pyrolysis for a user to suck.

In the embodiment shown in fig. 2, the article to be baked is a cigarette 100, and the cigarette 100 is provided with the microwave filtering membrane 120, it is understood that, in other embodiments, if the article to be baked only includes the tobacco 131 and the microwave absorbent 132, and the article to be baked is not provided with the microwave filtering membrane 120, the microwave filtering membrane 120 is required to be provided at the air flow outlet of the accommodating cavity 250 on the microwave heating device for heating the article to be baked, so as to prevent the microwave in the accommodating cavity 250 from leaking out.

In one embodiment, the microwave heating method for the cigarette 100 includes the following steps: firstly, the microwave generator 240 emits microwaves to heat the cigarettes 100; then, the tobacco 131 and the microwave absorbent 132 in the cigarette 100 both absorb the microwave to generate heat, the microwave absorbent 132 heats the tobacco 131 again through heat conduction, and under the dual heating mechanism of microwave radiation and heat conduction, the tobacco 131 is heated up to the effective baking temperature. In other embodiments, the microwave heating method for cigarette 100 further includes a temperature control step: the temperature detecting unit 400 detects the temperature of the cigarette 100 and sends the detection result to the circuit control unit 230, and the circuit control unit 230 controls the heating temperature of the cigarette 100 by controlling the working power of the microwave generator 240.

The temperature detecting unit 400 can detect the temperature of the cigarette 100 directly or indirectly, and the direct temperature measurement includes thermocouple temperature measurement, optical pyrometry, and infrared optical fiber temperature measurement, wherein the infrared optical fiber temperature measurement is measured according to infrared electromagnetic waves radiated from the surface of the cigarette. The indirect temperature measurement mainly includes empirical derivation, for example, the temperature of the cigarette is derived according to the change of the physical parameters of the cigarette, or the temperature of the cigarette is derived according to the working power of the microwave generator. The cigarette temperature control mode can be power feedback type temperature control, namely the circuit control unit controls the heating temperature of the cigarette by controlling the working frequency of the microwave generator. The microwave power control button 280 has a number of adjustment steps, for example, in one embodiment, six steps, as indicated by six different equilibrium temperatures on the cigarette, typically 250 c to 250 c, 20 c, one step.

According to the baked matter, the microwave absorbent 132 is added into the tobacco 131, the microwave absorbent 132 is made of a non-volatile solid material with a stable dielectric loss constant, and the microwave absorbent 132 can stably absorb microwaves to generate heat so as to conduct heating on the tobacco 131; in the process of volatilizing moisture, glycerin and the like in the tobacco 131 material, the microwave absorbent 132 can provide stable conductive heating, so that the temperature of the tobacco 131 can be continuously raised to the effective baking temperature, and unique smoke incense is volatilized through pyrolysis, so that a proper taste is obtained.

In one embodiment, silicon carbide ceramic powder, carbon powder, Fe is used₃0₄The powder, silicon carbide and carbon powder (weight ratio is 1:1) are added in a compounding way to be used as a microwave absorbent, the heating rate of cigarettes under the action of microwaves is measured according to different particle sizes and doping ratios, the working power of a microwave generator is 30W, the frequency of emitted microwaves is 2.45GHz, the internal temperature of the cigarettes is measured by a thermocouple, the temperature is controlled to be about 300 ℃ by adopting a power feedback temperature control mode, and D50 in the table 1 refers to the median of the particle sizes as shown in the table 1.

TABLE 1

As can be seen from the data in Table 1, after the temperature of the common cigarette is raised to about 80 ℃, the temperature is difficult to continue to rise, the heating rate of the cigarette can be accelerated by adding the microwave absorbent, the temperature of the cigarette can be raised to the temperature control design temperature, the heating rate of the cigarette can be increased along with the increase of the proportion of the microwave absorbent, and the particle size of the microwave absorbent has no obvious influence on the heating rate.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.