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.

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 3 O 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 μm to 200 μm. 
     
     
         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.