U.S. patent application number 17/699438 was filed with the patent office on 2022-07-28 for baked item, method for preparing baked item, and microwave heating method for baked item.
The applicant listed for this patent is SHENZHEN SMOORE TECHNOLOGY LIMITED. Invention is credited to He JIN, Junjie XIAO, Jiao ZHANG, Hongming ZHOU.
Application Number | 20220232882 17/699438 |
Document ID | / |
Family ID | |
Filed Date | 2022-07-28 |
United States Patent
Application |
20220232882 |
Kind Code |
A1 |
ZHOU; Hongming ; et
al. |
July 28, 2022 |
BAKED ITEM, METHOD FOR PREPARING BAKED ITEM, AND MICROWAVE HEATING
METHOD FOR BAKED ITEM
Abstract
A baked item includes a tobacco and a microwave absorbing agent.
The tobacco and the microwave absorbing agent are both capable of
absorbing microwaves to generate heat, the microwave absorbing
agent is made of a non-volatile solid material with a stable
dielectric loss constant. The microwave absorbing agent is capable
of stably absorbing microwaves to generate heat to heat the tobacco
through thermal conduction. A method for preparing the baked item
and a microwave heating method for the baked item include, the
microwave absorbing agent is added into the tobacco, and the
microwave absorbing agent can stably absorb microwaves to generate
heat. In addition to absorbing microwaves to generate heat, the
tobacco may be also heated by the microwave absorbing agent through
thermal conduction, and temperature rising of the tobacco is more
stable and uniform under a double heating mechanism of microwave
radiation and thermal conduction.
Inventors: |
ZHOU; Hongming; (Shenzhen,
CN) ; ZHANG; Jiao; (Shenzhen, CN) ; JIN;
He; (Shenzhen, CN) ; XIAO; Junjie; (Shenzhen,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SHENZHEN SMOORE TECHNOLOGY LIMITED |
Shenzhen |
|
CN |
|
|
Appl. No.: |
17/699438 |
Filed: |
March 21, 2022 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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PCT/CN2020/114540 |
Sep 10, 2020 |
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17699438 |
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International
Class: |
A24B 15/28 20060101
A24B015/28; A24B 3/18 20060101 A24B003/18; A24B 15/18 20060101
A24B015/18; A24B 15/22 20060101 A24B015/22 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 23, 2019 |
CN |
201910899623.X |
Claims
1. A baked item, comprising: a tobacco, comprising lignocellulose;
and a microwave absorbing agent, and wherein the tobacco and the
microwave absorbing agent are both capable of absorbing microwaves
to generate heat, the microwave absorbing agent is made of a
non-volatile solid material with a stable dielectric loss constant,
the dielectric loss constant of the microwave absorbing agent does
not change along with temperature, the dielectric loss constant of
the microwave absorbing agent is higher than a dielectric loss
constant of the lignocellulose in the tobacco, and the microwave
absorbing agent is capable of stably absorbing microwaves to
generate heat to heat the tobacco through thermal conduction.
2. The baked item according to claim 1, wherein the microwave
absorbing agent is one of or any combination of ceramic powder, an
inorganic non-metal element, a ferrite absorbing agent, and metal
powder.
3. The baked item according to claim 2, wherein the ceramic powder
comprises one of or any combination of silicon carbide, silicon
nitride, and aluminum nitride; the inorganic non-metal element
comprises one of or any combination of coke, carbon powder, or
graphite powder; the ferrite absorbing agent comprises
Fe.sub.3O.sub.4; and the metal powder comprises one of or any
combination of Ti powder, Fe powder, and Ni powder.
4. The baked item according to claim 1, wherein the microwave
absorbing agent is uniformly distributed in the tobacco, and a
particle size of the microwave absorbing agent ranges from 2 .mu.m
to 200 .mu.m.
5. The baked item according to claim 1, wherein a ratio of a volume
of the microwave absorbing agent to a volume of the tobacco ranges
from 1% to 30%.
6. The baked item according to claim 1, wherein a thermal
conductivity of the microwave absorbing agent is higher than a
thermal conductivity of the tobacco.
7. The baked item according to claim 1, wherein the baked item is a
cigarette, and the cigarette comprises a tobacco portion, a filter
portion, and a microwave filter membrane, wherein the tobacco
portion comprises the tobacco and the microwave absorbing agent;
and the microwave filter membrane is disposed in the filter portion
or between the filter portion and the tobacco portion.
8. The baked item according to claim 7, wherein the microwave
filter membrane is a metal foil, the metal foil is provided with a
first through hole, airflow is capable of circulating from the
first through hole, the metal foil is configured to reflect
microwaves to prevent microwave leakage, and the first through hole
is configured to intercept transmission of the microwaves.
9. A method, comprising: pulverizing a raw material of a tobacco
into a first component; adding an additive to the first component
and uniformly mixing to obtain a second component, and adding
powder of a microwave absorbing agent into the second component and
uniformly mixing to obtain a third component; or adding the
microwave absorbing agent and the additive to the first component
and uniformly mixing to obtain a fourth component; and shaping one
of the third component and the fourth component.
10. The method according to claim 9, wherein the additive comprises
one of or any combination of an acidity regulator, a bulking agent,
a humectant, a stabilization agent/coagulating agent, a thickening
agent, and a natural flavoring agent.
11. The method according to claim 9, wherein a manner for shaping
the third component or the fourth component comprises at least one
of coating, die-casting, and thermoforming.
12. A microwave heating method for a baked item, comprising:
generating, by a microwave generator, microwaves to heat the baked
item; absorbing, by a tobacco and a microwave absorbing agent, the
microwaves to generate heat; and heating, by the microwave
absorbing agent, the tobacco through thermal conduction.
13. The microwave heating method for the baked item according to
claim 12, further comprising: detecting, by a temperature detector,
a temperature of the baked item; and transmitting a result of the
detection to a circuit controller, so that the circuit controller
controls a heating temperature of the baked item by controlling a
working power of the microwave generator.
14. The microwave heating method for the baked item according to
claim 13, wherein a manner in which the temperature detector
detects the temperature of the baked item comprises at least one of
thermocouple temperature measurement, optical pyrometer temperature
measurement, and infrared optical fiber temperature
measurement.
15. The microwave heating method for the baked item according to
claim 13, wherein a manner in which the temperature detector
detects the temperature of the baked item comprises at least one of
calculating a temperature of a cigarette according to a variation
of a physical parameter of the cigarette and calculating a
temperature of a cigarette according to a working power of the
microwave generator.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of International
Application No. PCT/CN2020/114540, filed on Sep. 10, 2020, which
claims priority to Chinese Patent Application No. 201910899623.X,
filed on Sep. 23, 2019. The disclosures of the aforementioned
applications are hereby incorporated by reference in their
entireties.
TECHNICAL FIELD
[0002] This application relates to the field of microwave heating,
and in particular, to a baked item, a method for preparing the
baked item, and a microwave heating method for the baked item.
BACKGROUND
[0003] A heat not burn technology refers to a method of baking a
specific baked item (for example, a cigarette) through
low-temperature heating without burning to generate vapor for a
user to inhale.
[0004] Conventional low-temperature baking apparatuses mainly
energize a heating element, the heating element generates heat
through the Joule effect, and the heating element is in direct
contact with the baked item (tobacco) to transfer the heat to the
tobacco for baking. This method has problems such as a long
preheating time and non-uniform cigarette baking, and the
utilization efficiency of the tobacco is low.
[0005] Microwave heating is a process of utilizing continuous
polarization of a heated material in a microwave electromagnetic
field, and heating the material by using a dielectric loss (similar
to internal friction) generated due to high-frequency reciprocating
movement of dipoles inside the heated material. This method is
characterized by a high heating speed and being capable of heating
various parts of the baked item, so that the problems of a long
preheating time and poor cigarette baking uniformity of the
conventional electric heating method may be resolved. However, when
heating a conventional cigarette, general microwave heating
apparatuses cannot effectively heat the baked item to a target
temperature, so it is difficult to effectively bake a tobacco to
obtain a good taste.
SUMMARY
[0006] According to various embodiments of this application, a
baked item is provided, including a tobacco and a microwave
absorbing agent, where the tobacco and the microwave absorbing
agent are both capable of absorbing microwaves to generate heat,
the microwave absorbing agent is made of a non-volatile solid
material with a stable dielectric loss constant, the dielectric
loss constant of the microwave absorbing agent does not change
along with temperature, the dielectric loss constant of the
microwave absorbing agent is higher than a dielectric loss constant
of lignocellulose in the tobacco, and the microwave absorbing agent
is capable of stably absorbing microwaves to generate heat to heat
the tobacco through thermal conduction.
[0007] In an embodiment, the microwave absorbing agent is one of or
any combination of ceramic powder, an inorganic non-metal element,
a ferrite absorbing agent, or metal powder.
[0008] In an embodiment, the ceramic powder includes one of or any
combination of silicon carbide, silicon nitride, or aluminum
nitride; the inorganic non-metal element includes one of or any
combination of coke, carbon powder, or graphite powder; the ferrite
absorbing agent includes Fe.sub.3O.sub.4; and the metal powder
includes one of or any combination of Ti powder, Fe powder, or Ni
powder.
[0009] In an embodiment, the microwave absorbing agent is uniformly
distributed in the tobacco, and a particle size of the microwave
absorbing agent ranges from 2 .mu.m to 200 .mu.m.
[0010] In an embodiment, a ratio of a volume of the microwave
absorbing agent to a volume of the tobacco ranges from 1% to
30%.
[0011] In an embodiment, a thermal conductivity of the microwave
absorbing agent is higher than a thermal conductivity of the
tobacco.
[0012] In an embodiment, the baked item is a cigarette, and the
cigarette includes a tobacco portion, a filter portion, and a
microwave filter membrane, where the tobacco portion includes the
tobacco and the microwave absorbing agent; and the microwave filter
membrane is disposed in the filter portion or between the filter
portion and the tobacco portion.
[0013] In an embodiment, the microwave filter membrane is a metal
foil, the metal foil is provided with a first through hole, airflow
is capable of circulating from the first through hole, the metal
foil is configured to reflect microwaves to prevent microwave
leakage, and the first through hole is configured to intercept
transmission of the microwaves.
[0014] This application further provides a method for preparing the
foregoing baked item, including the following steps:
[0015] S110: pulverizing a tobacco raw material into a first
component;
[0016] S120: adding an additive to the first component to obtain a
second component through uniform mixing, and adding powder of the
microwave absorbing agent into the second component and uniformly
mixing to obtain a third component; or adding the microwave
absorbing agent and the additive to the first component and
uniformly mixing to obtain a fourth component through uniform
mixing; and
[0017] S130: shaping the third component or the fourth
component.
[0018] In an embodiment, the additive in step S120 includes one of
or any combination of an acidity regulator, a bulking agent, a
humectant, a stabilization agent/coagulating agent, a thickening
agent, or a natural flavoring agent.
[0019] In an embodiment, a manner for shaping the third component
or the fourth component in step S130 includes at least one of
coating, die-casting, or thermoforming.
[0020] This application further provides a microwave heating method
for the foregoing baked item, including the following steps:
[0021] S210: generating, by a microwave generator, microwaves to
heat the baked item; and
[0022] S220: absorbing, by the tobacco and the microwave absorbing
agent, the microwaves to generate heat, and further heating, by the
microwave absorbing agent, the tobacco through thermal
conduction.
[0023] In an embodiment, the microwave heating method for the baked
item further includes a temperature control step S230: detecting,
by a temperature detection unit, a temperature of the baked item,
and transmitting a result of the detection to a circuit control
unit, so that the circuit control unit controls a heating
temperature of the baked item by controlling a working power of the
microwave generator. In an embodiment, a manner in which the
temperature detection unit detects the temperature of the baked
item in step S230 includes at least one of thermocouple temperature
measurement, optical pyrometer temperature measurement, or infrared
optical fiber temperature measurement.
[0024] In an embodiment, a manner in which the temperature
detection unit detects the temperature of the baked item in step
S230 includes at least one of calculating a temperature of a
cigarette according to a variation of a physical parameter of the
cigarette or calculating a temperature of a cigarette according to
a working power of the microwave generator.
[0025] Details of one or more embodiments of this application are
provided in the accompanying drawings and descriptions below. Other
features, objectives, and advantages of this application will
become apparent from the specification, the accompanying drawings,
and the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] FIG. 1 is a schematic structural diagram of a cigarette
according to an embodiment of this application;
[0027] FIG. 2 is a schematic structural diagram of a microwave
heating apparatus according to an embodiment of this
application;
[0028] FIG. 3 is a schematic diagram of an electrical connection
relationship among electronic components in a microwave heating
apparatus according to an embodiment of this application;
[0029] FIG. 4 is a flowchart of a method for preparing a baked item
according to an embodiment of this application; and
[0030] FIG. 5 is a flowchart of a microwave heating method for a
baked item according to an embodiment of this application.
[0031] To better describe and illustrate embodiments and/or
examples in this application disclosed herein, reference may be
made to one or more accompanying drawings. Additional details or
examples used to describe the accompanying drawings should not be
considered as limiting the scope of any of the disclosed
application, currently described embodiments and/or examples, and
the best modes of this application currently understood.
DETAILED DESCRIPTION
[0032] To help understand this application, the following describes
this application more comprehensively with reference to the related
accompanying drawings. The accompanying drawings show exemplary
implementations of this application. However, this application may
be implemented in many different forms, and is not limited to the
implementations described in this specification. On the contrary,
the implementations are provided to make understanding of the
disclosed content of this application more comprehensive.
[0033] It should be noted that, when a component is referred to as
"being fixed to" another component, the component may be directly
on the component, or an intervening component may be present. When
a component is considered to be "connected to" another component,
the component may be directly connected to the other component, or
an intervening component may also be present. The terms "inter",
"outer", "left", "right" and similar expressions used in this
specification are only for purposes of illustration but do not
indicate a unique implementation.
[0034] When a baked item such as a conventional cigarette is heated
by microwaves, the cigarette can hardly be effectively heated to a
target temperature, so it is difficult to obtain a good taste. It
is found through research that a specific reason mainly lies in
that, general microwave heating frequency is 2.45 GHz, and a
heating power of a material of a unit volume under action of a
microwave field is P=2.pi.f.epsilon..sub.0.epsilon.' tan
.delta./E/.sup.2, where f is microwave frequency, .epsilon.' tan
.delta. is a dielectric loss constant of the material,
.epsilon..sub.0 is a vacuum dielectric constant, and E is an
intensity of a microwave electric field, so that the microwave
heating is closely related to the dielectric loss constant of the
material and the intensity of the microwave electric field. Main
components of a cigarette include lignocellulose, some water, and
additives such as glycerol and flavoring agent. A tobacco baking
process mainly includes volatilization of the water, the glycerol,
nicotine, and a plant volatile substance and thermolysis of some
cellulose and lignin. In a microwave heating early stage of the
cigarette, dielectric loss constants of the water (the dielectric
loss constant is 10 to 20) and the glycerol are relatively high, so
that the temperature of the tobacco can rise quickly. However,
along with volatilization of the water and the glycerol, and a
dielectric loss constant of the lignocellulose being relatively
small, a temperature-rising rate of the tobacco may decrease
quickly. Therefore, when a baked item such as a conventional
cigarette is heated by microwaves, the baked item cannot be
effectively heated to a target temperature, and according to a
design of the cigarette, the target temperature is generally
250.degree. C. to 400.degree. C.
[0035] In an embodiment, the baked item is a cigarette 100. As
shown in FIG. 1, the cigarette 100 includes a filter portion 110, a
microwave filter membrane 120, and a tobacco portion 130. The
tobacco portion 130 includes a tobacco 131 and a microwave
absorbing agent 132. The tobacco 131 is the same as a tobacco 131
in a common low-temperature baking cigarette. The tobacco 131 and
the microwave absorbing agent 132 are both capable of absorbing
microwaves to generate heat. The microwave absorbing agent 132 is
made of a non-volatile solid material with a stable dielectric loss
constant. The microwave absorbing agent 132 is capable of stably
absorbing microwaves to generate heat to heat the tobacco 131
through thermal conduction. Under double heating of microwave
radiation and thermal conduction, the temperature of the tobacco
131 can rise to an effective baking temperature.
[0036] The microwave absorbing agent 132 has a relatively stable
dielectric loss constant. It should be noted that, the relatively
stable dielectric loss constant of the microwave absorbing agent
described herein refers to that the microwave absorbing agent is
generally in a solid state and may not be volatilized or undergo a
chemical reaction, so that the dielectric loss constant thereof may
not change along with temperature, and the microwave absorbing
agent can stably absorb microwaves to generate heat. The microwave
absorbing agent 132 may be granular or sheet ceramic powder (for
example, silicon carbide, silicon nitride, or aluminum nitride), an
inorganic non-metal element (for example, coke, carbon powder, or
graphite powder), a ferrite absorbing agent (for example,
Fe.sub.3O.sub.4), or even metal powder (for example, Ti, Fe, or
Ni). The microwave absorbing agent 132 is added in a reproduction
process of the tobacco, so that the microwave absorbing agent is
uniformly distributed in the tobacco 131. The microwave absorbing
agent 132 may be one of or any combination of the foregoing ceramic
powder, the inorganic non-metal element, the ferrite absorbing
agent, or the metal powder. The dielectric loss constant of the
microwave absorbing agent is generally higher than a dielectric
loss constant of lignocellulose in the tobacco. For example, a
dielectric loss constant of the silicon carbide is generally 0.02
to 0.2, a dielectric loss constant of graphite ranges from 0.01 to
0.2, and a dielectric loss constant of lignocellulose is generally
lower than 1*10.sup.-3.
[0037] Mixing of the microwave absorbing agent 132 and the tobacco
131 is not common mechanical mixing, but is to dope the microwave
absorbing agent 132 in the reproduction process of the tobacco 131.
In an embodiment, and with reference to FIG. 4, a method for
preparing a tobacco 131 product mainly includes the following
steps:
[0038] S110: pulverizing a tobacco raw material into a first
component;
[0039] S120: adding a required additive to the first component
obtained in step S110 and uniformly mixing to form a second
component, the required additive mainly including an acidity
regulator, a bulking agent, a humectant, a stabilization
agent/coagulating agent, a thickening agent, or a natural flavoring
agent; and adding powder of the microwave absorbing agent 132 into
the second component and uniformly mixing to obtain a third
component; or adding the microwave absorbing agent 132 and the
additive to the first component and uniformly mixing to obtain a
fourth component; and
[0040] S130: shaping the third component or the fourth component by
coating, die-casting, or thermoforming. According to the foregoing
method for preparing the tobacco 131 product, the microwave
absorbing agent 132 can be mixed in the tobacco 131 quite
uniformly, to heat to the tobacco 131 through thermal conduction
subsequently.
[0041] For a particle size of the microwave absorbing agent 132,
the portability of being mixed into the tobacco 131 is mainly
considered, and it is difficult to mix the microwave absorbing
agent into the tobacco when the particle size is too large.
Therefore, in an embodiment, the particle size of the microwave
absorbing agent 132 ranges from 2 .mu.m to 200 .mu.m. In another
embodiment, the particle size of the microwave absorbing agent 132
ranges from 2 .mu.m to 50 .mu.m, and a ratio of a volume of the
microwave absorbing agent 132 to a volume of the tobacco 131 ranges
from 1% to 30%. In addition, generally, a thermal conductivity of
the powder of the microwave absorbing agent 132 is higher than a
thermal conductivity of the tobacco 131. Therefore, adding the
microwave absorbing agent 132 into the tobacco 131 can further
improve the thermal conductivity of the entire cigarette 100, to
further improve the temperature uniformity of the cigarette 100
after being heated.
[0042] After the cigarette 100 including the microwave absorbing
agent 132 is placed into a microwave heating apparatus, in addition
to absorbing microwaves to generate heat, the tobacco 131 of the
tobacco portion 130 may be further heated by the microwave
absorbing agent 132 through thermal conduction, and temperature
rising of the tobacco 131 is more stable and uniform under a double
heating mechanism of microwave radiation and thermal conduction. In
a volatilization process of materials such as water and glycerol in
the tobacco 131, the microwave absorbing agent 132 can provide
stable heating through thermal conduction, to enable the
temperature of the tobacco 131 to continue to rise to an effective
baking temperature and produce unique smoked incense through
thermolysis, thereby obtaining a good taste.
[0043] A main function of the microwave filter membrane 120 is to
prevent microwaves from being leaked out from the filter portion
110, and the microwave filter membrane may be located in the middle
of the filter portion 110 or may be located at a boundary of the
filter portion 110 and the tobacco portion 130. In the embodiment
shown in FIG. 1, the microwave filter membrane 120 is located in
the filter portion 110. In an embodiment, as shown in FIG. 1, the
microwave filter membrane 120 is a metal foil or a metal sheet. The
metal foil or the metal sheet is provided with a plurality of first
through holes 121, and airflow can flow normally at the first
through hole 121 when the cigarette 100 is smoked. The metal
material can reflect microwaves to prevent microwave leakage, and
the first through hole 121 can intercept transmission of microwaves
to play a role of shielding.
[0044] In an embodiment, FIG. 2 shows a structure of the microwave
heating apparatus configured to heat the cigarette 100, the
apparatus mainly includes a housing 210, and a power supply 220, a
circuit control unit 230, a microwave generator 240, and an
accommodation cavity 250 located in the housing 210. The
accommodation cavity 250 is configured to place the cigarette 100
including the microwave absorbing agent 132; and the microwave
generator 240 is configured to generate microwaves to further heat
the cigarette 100 in the accommodation cavity 250. FIG. 3 shows an
electrical connection relationship among the electronic components
in the microwave heating apparatus. As can be seen from FIG. 3, the
circuit control unit 230 is electrically connected to the microwave
generator 240 to control the microwave generator 240 to work; and
the power supply 220 is electrically connected to the circuit
control unit 230 to supply power to the microwave heating
apparatus.
[0045] In an embodiment, as shown in FIG. 2, the microwave heating
apparatus is further provided with 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 airway hole 211 on the housing 210, and the
airway hole 211 is in communication with the accommodation cavity
250. The electrical connection relationship among the electronic
components in the microwave heating apparatus is shown in FIG. 3,
the smoking set main control switch 260 is electrically connected
to the power supply 220 or the circuit control unit 230 to turn on
the microwave generator 240 to work; the display screen 270 is
electrically connected to the circuit control unit 230, to display
a working power of the microwave generator 240 and/or a temperature
in the accommodation cavity 250; the microwave power control button
280 is electrically connected to the circuit control unit 230 to
adjust and control working frequency of the microwave generator
240; the temperature detection unit 400 is electrically connected
to the circuit control unit 230 to detect a temperature of the
cigarette 100 in the accommodation cavity 250 and transmit a
detected temperature to the circuit control unit 230; and the
charging interface 212 is electrically connected to the power
supply 220 to charge the power supply 220 in the microwave heating
apparatus.
[0046] In a specific embodiment, as shown in FIG. 2, the microwave
generator 240 is a magnetron tube and can generate microwaves whose
frequency is 2.45 GHz; and a microwave transmission channel 290 is
further disposed between the microwave generator 240 and the
accommodation cavity 250, and the microwave transmission channel
290 is configured to transmit the microwaves generated by the
microwave generator 240 to the accommodation cavity 250. The
accommodation cavity 250 is a cylindrical microwave resonator, the
accommodation cavity 250 may be a metal material or may be a
high-temperature-resistant organic material such as ceramic or
teflon, but an inner side of the accommodation cavity 250 needs to
include a metal reflecting layer, to enable microwaves to be
vibrated and propagated inside the accommodation cavity 250. A
bottom of the accommodation cavity 250 is provided with a plurality
of second through holes 251 facilitating entrance of airflow in an
inhaling process and adjustment of inhaling resistance, and the
airway hole 211 on the housing 210 of the microwave heating
apparatus is in communication with the accommodation cavity 250
through the second through holes 251. After the cigarette 100 is
inserted into the accommodation cavity 250 of the microwave heating
apparatus, the accommodation cavity 250 and the microwave filter
membrane 120 in the cigarette 100 can form a microwave sealing
cavity. Once the microwave generator 240 is turned on, microwaves
are vibrated inside the accommodation cavity 250 to heat the
tobacco portion 130 (including the tobacco 131 and the microwave
absorbing agent 132) in the cigarette 100, to increase the
temperature of the tobacco portion of the cigarette 100 to a
suitable temperature, thereby baking suitable vapor through
thermolysis for a user to inhale.
[0047] In the embodiment shown in FIG. 2, the baked item is the
cigarette 100, and the cigarette 100 is provided with the microwave
filter membrane 120. It may be understood that, in some other
embodiments, if the baked item only includes the tobacco 131 and
the microwave absorbing agent 132, and the baked item is not
provided with the microwave filter membrane 120, the microwave
filter membrane 120 needs to be disposed at an airflow outlet of
the accommodation cavity 250 on the microwave heating apparatus
heating the baked item, to prevent microwaves inside the
accommodation cavity 250 from being leaked out.
[0048] In an embodiment, and with reference to FIG. 5, the
microwave heating method for the cigarette 100 includes the
following steps:
[0049] S210: generating, by the microwave generator 240, microwaves
to heat the cigarette 100; and
[0050] S220: absorbing, by the tobacco 131 and the microwave
absorbing agent 132 in the cigarette 100, the microwaves to
generate heat, and further heating, by the microwave absorbing
agent 132, the tobacco 131 through thermal conduction. The
temperature of the tobacco 131 rising to an effective baking
temperature under a dual heating mechanism of microwave radiation
and thermal conduction. In some other embodiments, the microwave
heating method for the cigarette 100 further includes a temperature
control step S230: detecting, by the temperature detection unit
400, a temperature of the cigarette 100, and transmitting a result
of the detection to the circuit control unit 230, so that the
circuit control unit 230 controls a heating temperature of the
cigarette 100 by controlling a working power of the microwave
generator 240.
[0051] The temperature detection unit 400 can directly or
indirectly detect the temperature of the cigarette 100. A direct
temperature measurement manner includes thermocouple temperature
measurement, optical pyrometer temperature measurement, and
infrared optical fiber temperature measurement, where the infrared
optical fiber temperature measurement is performed according to
infrared electromagnetic waves radiated on a surface of the
cigarette. An indirect temperature measurement manner mainly
includes calculating according to experience, for example,
calculating the temperature of the cigarette according to a
variation of a physical parameter of the cigarette or calculating
the temperature of the cigarette according to the working power of
the microwave generator. A temperature control manner of the
cigarette may be power feedback-type temperature control, namely,
the heating temperature of the cigarette is controlled by the
circuit control unit by controlling working frequency of the
microwave generator. The microwave power control button 280
includes a certain quantity of adjustment grades. For example, in
an embodiment, the microwave power control button includes six
grades, which indicates that the cigarette includes six different
balance temperatures, and generally, the balance temperatures range
from 250.degree. C. to 400.degree. C. with 20.degree. C. as a
stage.
[0052] According to the baked item in this application, the
microwave absorbing agent 132 is added into the tobacco 131, the
microwave absorbing agent 132 is made of a non-volatile solid
material with a stable dielectric loss constant, and the microwave
absorbing agent 132 is capable of stably absorbing microwaves to
generate heat to heat the tobacco 131 through thermal conduction.
After the baked item of this application is placed into a microwave
heating apparatus, in addition to absorbing microwaves to generate
heat, the tobacco 131 of the tobacco portion 130 may be further
heated by the microwave absorbing agent 132 through thermal
conduction, and temperature rising of the tobacco 131 is more
stable and uniform under a double heating mechanism of microwave
radiation and thermal conduction. In a volatilization process of
materials such as water and glycerol in the tobacco 131, the
microwave absorbing agent 132 can provide stable heating through
thermal conduction, to enable the temperature of the tobacco 131 to
continue to rise to an effective baking temperature and produce
unique smoked incense through thermolysis, thereby obtaining a good
taste.
[0053] In an embodiment, silicon carbide ceramic powder, carbon
powder, Fe.sub.3O.sub.4, and a composite additive of silicon
carbide and carbon powder (a weight proportion is 1:1) are used as
the microwave absorbing agent, to measure a temperature-rising rate
of the cigarette under action of microwaves in different particle
sizes and mixture ratios. A working power of the microwave
generator is 30 W, frequency of microwaves generated by the
microwave generator is 2.45 GHz, an internal temperature of the
cigarette is measured through thermocouple temperature measurement,
and the temperature is controlled to be around 300.degree. C. in
the power feedback-type temperature control manner. As shown in
Table 1, D50 in Table 1 refers to a median of the particle
sizes.
TABLE-US-00001 TABLE 1 Particle size Ratio Microwave of the of the
t = 3 min absorbing absorbing absorbing (balanced agent agent/D50
agent/% t = 5 s t = 10 s state) None (common / / 68.degree. C.
83.degree. C. 95.degree. C. cigarette) SiC 5 .mu.m 10% 104.degree.
C. 165.degree. C. 296.degree. C. SiC 15 .mu.m 20% 158.degree. C.
246.degree. C. 295.degree. C. SiC 15 .mu.m 30% 235.degree. C.
298.degree. C. 295.degree. C. SiC 25 .mu.m 30% 240.degree. C.
296.degree. C. 298.degree. C. Carbon powder 15 .mu.m 20%
180.degree. C. 265.degree. C. 296.degree. C. Carbon powder 25 .mu.m
30% 275.degree. C. 295.degree. C. 298.degree. C. Fe.sub.3O.sub.4
powder 15 .mu.m 20% 82.degree. C. 128.degree. C. 296.degree. C.
Fe.sub.3O.sub.4 powder 25 .mu.m 30% 125.degree. C. 163.degree. C.
295.degree. C. Sic/C powder 15 .mu.m 20% 235.degree. C. 298.degree.
C. 298.degree. C. (1:1)
[0054] As can be seen from the data in Table 1, after the
temperature of the common cigarette rises to about 80.degree. C.,
it is difficult for the temperature to continue to rise. Addition
of the microwave absorbing agent can increase the
temperature-rising rate of the cigarette, to raise the temperature
of the cigarette to a temperature designed by temperature control.
As the content of the microwave absorbing agent increases, the
temperature-rising rate of the cigarette may be increased, and the
particle size of the microwave absorbing agent has no apparent
impact on the temperature-rising rate.
[0055] The technical features in the foregoing embodiments may be
combined. For concise description, not all possible combinations of
the technical features in the embodiments are described. However,
provided that combinations of the technical features do not
conflict with each other, the combinations of the technical
features are considered as falling within the scope described in
this specification.
[0056] The foregoing embodiments merely express several
implementations of this application. The descriptions thereof are
relatively specific and detailed, but should not be understood as
limitations to the scope of this application. It should be noted
that for a person of ordinary skill in the art, several
transformations and improvements can be made without departing from
the idea of this application. These transformations and
improvements belong to the protection scope of this application.
Therefore, the protection scope of the patent of this application
shall be subject to the appended claims.
* * * * *