Patent Publication Number: US-2023157349-A1

Title: Aerosol generating article and method of manufacturing the same

Description:
TECHNICAL FIELD 
     The present disclosure relates to an aerosol generating article and a method of manufacturing the aerosol generating article, and more particularly, to an aerosol generating article in which ease of cutting and heat-generating efficiency of a susceptor material may be improved, and a method of manufacturing the aerosol generating article. 
     BACKGROUND ART 
     Recently, there is an increasing demand for alternative methods of coping with the shortcomings of general cigarettes. For example, there is an increasing demand for a method of generating aerosols by heating an aerosol generating material in cigarettes or liquid storages rather than generating aerosols by burning cigarettes. 
     There have been proposed heating methods different from a method of arranging a heater, which is formed of an electrically resistant material, inside or outside of a cigarette accommodated in an aerosol generating device and heating the cigarette by providing power to the heater. Particularly, research on methods of heating cigarettes by an induction heating method has been actively conducted. 
     In such an induction heating method, a susceptor is heated via an induction coil. However, as susceptors in the related art are formed of a single object having the same volume, there are problems in that the susceptor is not easy to process (for example, cut) and has lower heat-generating efficiency. 
     DESCRIPTION OF EMBODIMENTS 
     Technical Problem 
     The present disclosure is to provide an aerosol generating article, by which ease of manufacturing a susceptor material and heat-generating efficiency may be improved, and a method of manufacturing the aerosol generating article. 
     The technical problem of the present disclosure is not limited thereto, and other technical problems may also be derived from examples described below. 
     Solution to Problem 
     A method of manufacturing an aerosol generating article includes providing a tobacco rod including a susceptor having a form in which a plurality of strands are twisted together, providing a filter rod arranged at an end of the tobacco rod, and wrapping the tobacco rod and the filter rod with a wrapper. 
     Advantageous Effects of Disclosure 
     According to the method of manufacturing the aerosol generating article of the present disclosure, a susceptor is manufactured in a twisted form, the susceptor may be easily cut. 
     According to the method of manufacturing the aerosol generating article of the present disclosure, a susceptor in a twisted form is surrounded with a tobacco material, the tobacco material is processed into a cylindrical object, and the susceptor is cut together with the tobacco material. Thus, production rate may be significantly improved, and mass production is facilitated. 
     In addition, according to the method of manufacturing the aerosol generating article of the present disclosure, the susceptor manufactured in the twisted form is impregnated with the aerosol generating material, and therefore an increase in a heat-generating area leads to a significant increase in a heat-generating efficiency. 
     Advantages effects of the present disclosure are not limited to the aforementioned examples, and more various effects are included in the present specification. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIGS.  1  to  2    are diagrams of an aerosol generating device of an induction heating type; 
         FIGS.  3  and  4    are diagrams of examples of a cigarette inserted into an aerosol generating device; 
         FIG.  5    is a diagram illustrating a method of manufacturing a susceptor included in the cigarette shown in  FIG.  4   ; 
         FIG.  6    is a diagram illustrating diameters of wires included in a susceptor; 
         FIG.  7    is a diagram illustrating a method of removing a portion of a susceptor; 
         FIG.  8    is a diagram illustrating a method of impregnating a susceptor with an aerosol generating material; 
         FIG.  9    is a diagram illustrating a cigarette according to an embodiment; 
         FIG.  10    is a diagram illustrating a cigarette according to another embodiment; 
         FIGS.  11  and  12    are diagrams illustrating a cooling segment included in a cigarette; and 
         FIG.  13    is a flowchart illustrating a method of manufacturing an aerosol generating article according to an embodiment of the present disclosure. 
     
    
    
     BEST MODE 
     A method of manufacturing an aerosol generating article includes: providing a tobacco rod including a susceptor having a form in which a plurality of strands are twisted together; providing a filter rod arranged at one end of the tobacco rod; and wrapping the tobacco rod and the filter rod with a wrapper. 
     In addition, the providing of the tobacco rod includes: providing a susceptor extending in a direction; surrounding the susceptor with a tobacco material and processing the tobacco material into a cylindrical shape; and cutting the cylindrical shape. 
     In addition, the providing of the susceptor includes: providing a plurality of wires having different lengths; forming the plurality of wires into a form twisted in a preset direction; and extending the form twisted in the preset direction by adding a new wire. 
     In addition, the plurality of wires have different diameters. 
     In addition, the providing the susceptor further includes impregnating the susceptor having the form which the plurality of strands are twisted, with an aerosol generating material. 
     In addition, the cutting the cylindrical shape includes removing a portion in which a preset number or more of wires are twisted together. 
     In addition, the providing the filter rod includes: providing a cooling segment configured to cool an aerosol; and providing a filter segment arranged at an end of the cooling segment and configured to filter certain materials included in the aerosol. 
     In addition, the providing the cooling segment includes: providing a first cooling member configured to allow the aerosol pass therethrough and having a first diameter; and providing a second cooling member having a second diameter different from the first diameter. 
     In addition, before the providing of the tobacco rod, the method of manufacturing the aerosol generating article further includes providing a front-end plug arranged at another end of the tobacco rod. 
     The wrapping with the wrapper includes forming a perforation in a region of the wrapper surrounding at least one of the tobacco rod and the filter rod. 
     According to another aspect, the aerosol generating article includes: a tobacco rod including a susceptor formed into a form in which a plurality of strands are twisted together; a filter rod arranged at an end of the tobacco rod; and a wrapper wrapped around the tobacco rod and the filter rod. 
     Mode of Disclosure 
     With respect to the terms used to describe the various embodiments, general terms which are currently and widely used are selected in consideration of functions of structural elements in the various embodiments of the present disclosure. However, meanings of the terms may be changed according to intention, a judicial precedence, the appearance of new technology, and the like. Also, specified terms may be selected by the applicant, and in this case, the detailed meaning thereof will be described in detailed description of the disclosure. Thus, the terms used in the present disclosure should not be understood as simple names, but should be understood based on the meaning of the terms and the overall descriptions of the present disclosure. 
     Throughout the specification, when a portion “includes” an element, another element may be further included, rather than excluding the existence of the other element, unless otherwise described. In addition, the terms “unit,” “module,” and the like described in the specification indicate units for processing at least one function or operation and may be implemented by hardware components or software components or combinations thereof. 
     Hereinafter, the present disclosure will be described more fully with reference to the accompanying drawings, in which embodiments of the present disclosure are shown such that one of ordinary skill in the art may easily understand the present disclosure. However, the present disclosure may be embodied in various types and is not limited to the embodiments described herein. 
     Hereinafter, embodiments of the disclosure will be described in detail with reference to the accompanying drawings. 
       FIGS.  1  to  2    are diagrams of an aerosol generating device of an induction heating type. 
     Referring to  FIG.  1   , an aerosol generating device  100  may include a susceptor  110 , an accommodating space  120 , a coil portion  130 , a battery  140 , and a controller  150 . According to embodiments, the susceptor  110  may be included in a cigarette  200  (see  FIGS.  3  to  4   ). In this case, as shown in  FIG.  2   , the aerosol generating device  100  may not include the susceptor  110 . 
     The aerosol generating device  100  shown in  FIGS.  1  to  2    includes components related to the present embodiment. Accordingly, those skilled in the related art may understand that other general-purpose components, in addition to the components shown in  FIGS.  1  to  2   , may be further included in the aerosol generating device  100 . 
     The aerosol generating device  100  may generate an aerosol by heating the cigarette  200 , which is accommodated in the aerosol generating device  100 , in an induction heating method. The induction heating method may indicate a method of generating heat from a magnetic substance by applying an alternating magnetic field, direction of which periodically changes, to the magnetic substance that generates heat due to an external magnetic field. 
     When the alternating magnetic field is applied to the magnetic substance, an energy loss due to an eddy current loss and hysteresis loss may occur to the magnetic field, and the lost energy may be emitted as heat energy from the magnetic substance. As the alternating magnetic field applied to the magnetic substance has a greater amplitude or frequency, a greater amount of heat energy may be emitted from the magnetic substance. The aerosol generating device  100  may have the magnetic substance emit the heat energy by applying the alternating magnetic field to the magnetic substance, and may deliver the heat energy, which is emitted from the magnetic substance, to the cigarette  200 . 
     The magnetic substance generating heat due to the external magnetic field may include the susceptor  110 . The susceptor  110  may be in the form of a piece, flake, or strip. 
     The susceptor  110  may include a metal or carbon. The susceptor  110  may include at least one of ferrite, a ferromagnetic alloy, stainless steel, and aluminum (Al). In addition, the susceptor  110  may include at least one of graphite, molybdenum, silicon carbide, niobium, nickel alloy, a metal film, ceramic such as zirconia, a transition metal such as nickel (Ni) or cobalt (Co), or a metalloid such as boron (B) or phosphorus (P). 
     The aerosol generating device  100  may include the accommodating space  120  for accommodating the cigarette  200 . The accommodating space  120  may include an opening that is open from outside of the accommodating space  120  to accommodate the cigarette  200  in the aerosol generating device  100 . Through the opening of the accommodating space  120 , the cigarette  200  may be accommodated in the aerosol generating device  100  in a direction from the outside of the accommodating space  120  to inside of the accommodating space  120 . 
     As shown in  FIG.  1   , the susceptor  110  may be arranged at an inner end portion of the accommodating space  120 . The susceptor  110  may be attached to a bottom surface formed at the inner end portion of the accommodating space  120 . The cigarette  200  may be inserted into the susceptor  110  from top of the susceptor  110  and accommodated to the bottom surface of the accommodating space  120 . 
     Alternatively, as shown in  FIG.  2   , the aerosol generating device  100  may not include the susceptor  110 . In this case, the susceptor  110  may be included in the cigarette  200 . 
     The aerosol generating device  100  may include a coil portion  130  configured to apply an alternating magnetic field to the susceptor  110  and induce magnetism in the susceptor  110 . The coil portion  130  may include at least one coil. 
     The coil may be implemented as a solenoid. The coil may include a solenoid wound along a side of the accommodating space  120 , and the cigarette  200  may be accommodated in an inner space of the solenoid. A material of a wiring included in the solenoid may include copper (Cu). However, the embodiment is not limited thereto, and as a material having a low resistivity and allowing a high current to flow therethrough, an alloy including any one or at least one of silver (Ag), gold (Au), aluminum (Al), tungsten (W), zinc (Zn), and nickel (N) may be the material of the wiring included in the solenoid. 
     The battery  140  may provide power to the coil portion  130 . The battery  140  may include, but is not limited to, a lithium-iron phosphate (LiFePO 4 ) battery. For example, the battery may include a lithium cobalt oxide (LiCoO 2 ) battery, lithium titanate battery, and the like. 
     The controller  150  may control the power provided to the coil portion  130 . When the coil portion  130  includes a plurality of coils, the controller  150  may change an amplitude, a frequency, and the like of an alternating current provided to the plurality of coils. In addition, the controller  150  may change a magnitude and the like of a direct current provided to the plurality of coils. 
     The controller  150  may perform induction heating on the susceptor  110  by controlling the amplitude, frequency and the like of the alternating current. In addition, the controller  150  may induce magnetism to the susceptor  110  by controlling the magnitude and the like of the direct current. The controller  150  may sense a change in magnetism of the susceptor caused by induction heating, and may calculate a temperature of the susceptor  110  based on a result of the sensing. 
       FIGS.  3  and  4    are diagrams of examples of the cigarette inserted into the aerosol generating device. 
     More particularly,  FIG.  3    illustrates an example of the cigarette  200  inserted into the aerosol generating device  100  when the susceptor  110  is arranged in the aerosol generating device  100 , and  FIG.  4    illustrates an example of the cigarette  200  inserted into the aerosol generating device  100  when the susceptor  110  is arranged in the cigarette  200 . 
     Referring to  FIG.  3   , the cigarette  200  may be accommodated in the accommodating space  120  in a longitudinal direction of the cigarette  200 . The susceptor  110  may be inserted into the cigarette  200  that is accommodated in the aerosol generating device  100 . As the susceptor  110  is inserted into the cigarette  200 , a tobacco rod  210  may contact the susceptor  110 . The susceptor  110  may have a structure extending in a longitudinal direction of the aerosol generating device  100  to be inserted into the cigarette  200 . 
     The susceptor  110  may be in a center portion of the accommodating space  120  to be inserted into a center portion of the cigarette  200 . Although  FIG.  3    illustrates that there is only one susceptor  110 , the embodiment is not limited thereto. In other words, the aerosol generating device  100  of the present disclosure may include a plurality of susceptors  110  extending in the longitudinal direction of the aerosol generating device  100  and arranged in parallel to one another to be inserted into the cigarette  200 . 
     The coil portion  130  may include at least one coil, and the coil may be wound along an outer surface of the accommodating space  120  and extend in a longitudinal direction of the aerosol generating device  100 . The coil extending in the longitudinal direction may be arranged at the outer surface of the accommodating space  120 . The coil may extend in the longitudinal direction of the aerosol generating device  100  to a length corresponding to a length of the susceptor  110 , and may be arranged at a position corresponding to a position of the susceptor  110 . 
     Referring to  FIG.  4   , the cigarette  200  may be accommodated in the accommodating space  120  in a longitudinal direction of the cigarette  200 . As the cigarette  200  is inserted into the accommodating space  120 , the susceptor  110  may be surrounded by the coil portion  130 . 
     To uniformly deliver the heat, the susceptor  110  may be in a center portion of the tobacco rod  210 . Although  FIG.  4    illustrates that there is only one susceptor  110 , the embodiment is not limited thereto. In other words, the aerosol generating device  100  of the present disclosure may include a plurality of the susceptors  110  included in the cigarette  200 . 
     As described below with reference to  FIG.  5   , the susceptor  110  shown in  FIG.  4    may be manufactured in a twisted manner. According to embodiments, the susceptor  110  in  FIG.  3    may also be manufactured in a twisted manner. 
     The coil portion  130  may include at least one coil, and the coil may be wound along an outer surface of the accommodating space  120  and extend in a longitudinal direction of the aerosol generating device  100 . The coil extending in the longitudinal direction of the aerosol generating device  100  may be arranged at the outer surface of the accommodating space  120 . The coil may extend in the longitudinal direction of the aerosol generating device  100  to a length corresponding to a length of the susceptor  110 , and may be arranged at a position corresponding to a position of the susceptor  110 . 
       FIG.  5    is a diagram illustrating a method of manufacturing the susceptor included in the cigarette shown in  FIG.  4   . 
     Referring to  FIG.  5   , the cigarette  200  may include the susceptor  110 . The cigarette  200  may be referred to as an aerosol generating article. 
     The susceptor  110  may include a plurality of wires  511 ,  512 ,  513  The plurality of wires  511 ,  512 ,  513  may include at least one of ferrite, a ferromagnetic alloy, stainless steel, and aluminum (Al). In addition, the plurality of wires  511 ,  512 ,  513  may include at least one of graphite, molybdenum, silicon carbide, niobium, nickel alloy, a metal film, ceramic such as zirconia, a transition metal such as nickel (Ni) or cobalt (Co), and a metalloid such as boron (B) or phosphorus (P). Cross-sections of the plurality of wires  511 ,  512 ,  513  may be circular. 
     In an embodiment, the susceptor  110  may include three wires  511 ,  512 ,  513 . Hereinafter, an example in which the susceptor  110  includes three wires, that is, the first wire  511 , the second wire,  512 , and the third wire  513 , will be described, but the number of wires is not limited thereto. 
     The susceptor  110  may include the first wire  511 , the second wire  512 , and the third wire  513 . The first wire  511 , the second wire  512 , and the third wire  513  may have different lengths, respectively. For example, the first wire  511  may have a first length, the second wire  512  may have a second length greater than the first length, and the third wire  513  may have a third length greater than the second length. 
     The susceptor  110  may be manufactured into a form in which the first wire  511 , the second wire  512 , and the third wire  513  are twisted together. In other words, the first wire  511 , the second wire  512 , and the third wire  513  may be twisted together. Accordingly, the first wire  511 , the second wire, and the third wire  513  may extend with inclination with respect to the longitudinal direction. Here, the direction may indicate the longitudinal direction of the cigarette  200 . As the susceptor  110  is manufactured in the twisted form, the susceptor  110  may be easily cut compared with a susceptor formed into a single body having the same volume, and a tensile strength of the susceptor  110  may be improved. 
     The first wire  511 , the second wire  512 , and the third wire  513  may be twisted in a preset direction. For example, the first wire  511 , the second wire  512 , and the third wire  513  may be twisted in a clockwise direction. As another example, the first wire  511 , the second wire  512 , and the third wire  513  may be twisted in a counter-clockwise direction. 
     The first wire  511 , the second wire  512 , and the third wire  513  may be formed twisted in the preset direction, and may extend in a direction. For example, the direction may indicate the longitudinal direction of the cigarette  200 . 
     As the first wire  511 , the second wire  512 , and the third wire  513  respectively have different lengths, at a certain time point, one of the aforementioned wires is no more twisted with other two wires. In the method of the present disclosure, a new wire is added in consideration of the preset time point, and by doing so, the susceptor  110  may be extended. 
     More particularly, as the first wire  511  has a smallest length among the first wire  511 , the second wire  512 , and the third wire  513 , and therefore, a new wire  514  may be provided at a time point from which the first wire  511  is no more twisted with the second wire  512  and the third wire  513 . For example, the preset time point may be set based on a time point at which a length of a non-twisted portion is less than a reference length. The reference length may be 1 cm to 3 cm, but is not limited thereto. 
     The new wire  514  that has been provided may be twisted together with the second wire  512  and the third wire  513 . Accordingly, the susceptor  110  may extend in a direction. A length of the new wire  514  may be set based on a length of the longest wire from among the plurality of wires  511 ,  512 ,  513 . For example, the length of the new wire  514  may be set greater than the length of the third wire  513 . 
     As the first wire  511 , the second wire  512 , and the third wire  513  are provided in different lengths, lengths of new wires  514  to be added thereafter may have the same length. In other words, as the susceptor  110  of the present disclosure may be manufactured in an unlimited continuous supply method, the producing rate may be significantly increased. 
       FIG.  6    is a diagram illustrating diameters of the wires included in the susceptor. 
       FIG.  6    is a schematic cross-sectional view of the susceptor  110 . Referring to  FIG.  6   , the plurality of wires  511 ,  512 ,  513  may have different diameters, respectively. For example, the first wire  511  may be set to have the first diameter r 1 , the second wire  512  may be set to have the second diameter r 2  greater than the first diameter r 1 , and the third wire  513  may be set as the third diameter r 3  greater than the second diameter r 2 . 
     As the plurality of wires  511 ,  512 ,  513  are set to have different diameters, the porosity may be improved. In addition, as the porosity increases, the capacity to conserve the aerosol generating material to be described later may also be improved. 
       FIG.  7    is a diagram illustrating a method of removing a portion of the susceptor. 
       FIG.  7    schematically illustrates cross-sections  710  and  720  of the susceptor  110 . Referring to  FIG.  7   , the susceptor  110  includes three wires, that is, the first wire  511 , the second wire  512 , and the third wire  513 . Accordingly, in the cross-section  710  of the susceptor  110 , the first wire  511 , the second wire  512 , and the third  513  may be seen. However, according to the unlimited supply method described above, at least four wires  511 ,  512 ,  513 ,  514  may be seen in a cross-section  720  of a portion of the susceptor  110 . 
     According to the method of the present disclosure, for accuracy of control, a portion in which a preset number or more of wires are twisted together may be removed. For example, the preset number may include four, but is not limited thereto. 
     In an embodiment, the portion in which the preset number or more of wires are twisted together may be detected based on a weight per unit length. In another embodiment, the portion in which the preset number of more of wires are twisted together may be detected based on a change in capacity when a current is induced in the susceptor  110 . 
       FIG.  8    is a diagram illustrating a method of impregnating the susceptor with an aerosol generating material. 
     Referring to  FIG.  8   , the susceptor  110  may be manufactured in a form in which the first wire  511 , the second wire  512 , and the third wire  513  twisted together. The plurality of wires  511 ,  512 ,  513  may be impregnated with the aerosol generating material  810 . In other words, the aerosol generating material  810  may penetrate among a plurality of wire strands. The aerosol generating material  810  may penetrate among the plurality of wire strands by being sprayed thereon. 
     The aerosol generating material may include undiluted slurry, glycerin, and the like. According to embodiments, the aerosol generating material  810  may include one component of water, solvents, ethanol, plant extracts, spices, flavorings, and vitamin mixtures, or a mixture of these components. The spices may include, but is not limited to, menthol, peppermint, spearmint oil, fruit-flavored ingredients, and the like. The flavorings may include components to provide various flavors or savors to the user. The vitamin mixtures may include, but is not limited to, a mixture of at least one of vitamin A, vitamin B, vitamin C, and vitamin E. In addition, the aerosol generating material  810  may include an aerosol forming agent such as glycerin and propylene glycol. 
     For example, the aerosol generating material  810  may include any weight ratio of glycerin and propylene glycol solution to which nicotine salts are added. The aerosol generating material  810  may also include two or more kinds of nicotine salt. Nicotine salts may be formed by adding suitable acids, including organic or inorganic acids, to nicotine. As a naturally generated nicotine or synthetic nicotine, nicotine may have a concentration of any suitable weight relative to a total solution weight of the aerosol generating material  810 . 
     Acids for forming nicotine salt may be properly selected in consideration of blood nicotine absorption rate, an operation temperature of the aerosol generating device  100 , flavors or savors, a solubility, and the like. For example, the acids for forming the nicotine salt may be one or a combination of at least two acids selected from among benzoic acid, lactic acid, salicylic acid, lauric acid, sorbic acid, levulic acid, pyruvic acid, formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, capric acid, citric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, phenylacetic acid, tartaric acid, succinic acid, fumaric acid, gluconic acid, saccharic acid, malonic acid, or malic acid. 
     As the susceptor  110  has the form in which a plurality of wire strands are twisted together, the aerosol generating material  810  may penetrate among the wires of the susceptor  110 , and accordingly, a heat-generating area may increase. In addition, due to the increase in the heat-generating area, a heat-generating efficiency may be significantly improved. 
       FIG.  9    is a diagram illustrating the cigarette according to an embodiment. 
     Referring to  FIG.  9   , a cigarette  2  includes a tobacco rod  21  and a filter rod  22 . The cigarette  2  may correspond to the cigarette  200  shown in  FIG.  4   . 
     The tobacco rod  21  includes an aerosol generating material. For example, the aerosol generating material may include at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol, but it is not limited thereto. In addition, the tobacco rod  21  may include other additional materials such as a flavoring agent, a wetting agent, and/or organic acid. In addition, a flavoring liquid such as menthol or moisturizer may be added to the tobacco rod  21  by being sprayed thereon. 
     The tobacco rod  21  may be variously manufactured. For example, the tobacco rod  21  may be manufactured into a sheet or strands. In addition, the tobacco rod  21  may be manufactured using pipe tobacco, which is formed of tiny bits cut from a tobacco sheet. In addition, the tobacco rod  21  may be surrounded by a heat-conducting material. For example, the heat-conducting material may be, but is not limited to, a metal foil such as aluminum foil. For example, the heat-conducting material surrounding the tobacco rod  21  may uniformly disperse the heat delivered to the tobacco rod  21 , to thereby improve the conductivity of the heat applied to the tobacco rod, and by doing so, the flavor of the tobacco may be improved. Furthermore, the heat-conducting material surrounding the tobacco rod  21  may function as a susceptor heated by the induction heater. 
     The tobacco rod  21  may further include the susceptor  110  in addition to the heat-conducting material surrounding the outside of the tobacco rod  21 . 
     The susceptor  110  may have a form in which a plurality of strands are twisted together. The susceptor  110  may be arranged at a center portion of the tobacco rod  21  and extend in a longitudinal direction of the tobacco rod  21 . A length of the susceptor  110  may be set equal to or less than a length of the tobacco rod  21 . Although  FIG.  9    illustrates an example in which the length of the susceptor  110  is set equal to the length of the tobacco rod  21 , according to embodiments, the length of the susceptor  110  may be set less than the length of the tobacco rod  21 . 
     The susceptor  110  may be surrounded by the tobacco material, and the tobacco material may be processed into a cylindrical object. In addition, the tobacco material and the susceptor  110  may be cut together to form the tobacco rod  21 . 
     The filter rod  22  may be arranged at an end of the tobacco rod  21 . The filter rod  22  may include a plurality of segments. In an embodiment, the filter rod  22  may include a cooling segment  221  configured to cool the aerosol and a filter segment  222  configured to filter certain ingredients included in the aerosol. The cooling segment  221  may be arranged at an end of the tobacco rod  21 , and the filter segment  222  may be arranged at an end of the cooling segment  221 , at a portion in contact with the user&#39;s lips. Depending on necessity, the filter rod  22  may further include at least one segment configured to perform another function. 
     The filter segment  222  may include at least one capsule  23 . Here, the capsule  23  may perform a function of generating a flavor, or may perform a function of generating an aerosol. For example, the capsule  23  may have a configuration in which a liquid containing a flavoring material is wrapped with a film. The capsule  23  may have a spherical or cylindrical shape, but is not limited thereto. 
     The filter rod  22  may include a cellulose acetate filter. A shape of the filter rod  22  is not limited. For example, the filter rod  22  may include a cylinder type rod, or may include a tube type rod including a hollow therein. In addition, the filter rod  22  may also include a recess type rod. When the filter rod  22  includes a plurality of segments, at least one of the plurality of segments may be manufactured in a shape different from those of others. 
     The cigarette  2  may be wrapped with at least one wrapper  24 . At least one hole for introduction of external air or discharge of internal air may be formed in the wrapper  24 . For example, the cigarette  2  may be wrapped with one wrapper  24 . As another example, the cigarette  2  may be wrapped in layers with two or more wrappers  24 . For example, the tobacco rod  21  may be wrapped with a first wrapper  241 , and the filter rod  22  may be wrapped with wrappers  243  and  244 . In addition, the entire portion of the cigarette  2  may be re-wrapped with a single wrapper  245 . In a case where the filter rod  22  includes a plurality of segments, the segments may be respectively wrapped with the wrappers  243  and  244 . 
     At least one perforation  26  may be formed in the wrappers  241 ,  243  and  244 . The perforation may be formed in a region surrounding at least one of the tobacco rod  21  and the filter rod  22 . Although  FIG.  9    illustrates an example in which the perforation  26  is formed in a region surrounding the filter rod  22 , according to embodiments, the perforation  26  may be formed in a region surrounding the tobacco rod  21 . 
       FIG.  10    is a diagram illustrating a cigarette according to another embodiment. 
     Referring to  FIG.  10   , a cigarette  3  may correspond to the cigarette  200  shown in  FIG.  4   . In addition, a tobacco rod  31 , a filter rod  32 , a cooling segment  321 , a filter segment  322 , and a capsule  34  shown in  FIG.  10    may respectively correspond to the tobacco rod  21 , the filter rod  22 , the cooling segment  221 , the filter segment  222 , and the capsule  23  shown in  FIG.  9   . Therefore, repeated descriptions will not be given. 
     The cigarette  3  shown in  FIG.  30    may further include a front-end plug  33 . With reference to the tobacco rod  31 , the front-end plug  33  may be at another end opposite to the filter rod  32 . The front-end plug  33  may prevent the tobacco rod  31  from being displaced to the outside, and may prevent a liquefied aerosol from flowing from the tobacco rod  31  into the aerosol generating device  100  during smoking. 
     A diameter and a total length of the cigarette  3  may correspond to a diameter and a total length of the cigarette  2  shown in  FIG.  9   . For example, a length of the front-end plug  33  may be about 7 mm, a length of the tobacco rod  31  may be about 15 mm, a length of the cooling segment  321  may be about 12 mm, and a length of the filter segment  322  may be about 14 mm, but the lengths are not limited thereto. 
     The cigarette  3  may be wrapped with at least one wrapper  35 . At least one hole for introduction of external air or discharge of internal air may be formed in the wrapper  35 . For example, the front-end plug  33  may be wrapped with a first wrapper  351 , the tobacco rod  31  may be wrapped with a second wrapper  352 , the cooling segment  321  may be wrapped with a third wrapper  353 , and the filter segment  322  may be wrapped with a fourth wrapper  354 . In addition, the entire portion of the cigarette  3  may be re-wrapped with a fifth wrapper  355 . 
     In addition, at least one perforation  36  may be formed in the fifth wrapper  355 . The perforation  36  may be formed in a region surrounding at least one of the tobacco rod  31  and the filter rod  32 . Although  FIG.  10    illustrates an example in which the perforation  36  is formed in a region surrounding the tobacco rod  31 , according to embodiments, the perforation  36  may be formed in a region surrounding the filter rod  32 . 
       FIGS.  11  to  12    are diagrams illustrating the cooling segments included in the cigarettes. 
       FIGS.  11  to  12    respectively illustrate cross-sections of the cooling segments  221  and  321 . Referring to  FIGS.  11  to  12   , the cooling segments  221  and  321  may include cooling members including a first cooling member  1110  and a second cooling member  1120 , the cooling members having different diameters. 
     As shown in  FIG.  11   , the cooling segments  221  and  321  may include the first cooling member  1110  having a first diameter ra and the second cooling member  1120  having a second diameter rb greater than the first diameter ra. An end of the first cooling member  1110  may contact the tobacco rod  21 , and an end of the second cooling member  1120  may contact the filter segments  222  and  322 . 
     According to embodiments, as shown in  FIG.  12   , the first diameter ra may be greater than the second diameter rb. That is, the cooling segments  221  and  321  may include the first cooling member  1110  having the first diameter ra and the second cooling member  1120  having the second diameter rb that is less than the first diameter ra. 
     As the tobacco rods  21  and  31  include the susceptor  110 , the first diameter ra may be less than a diameter of the susceptor  110 . As such, the susceptor  110  may be prevented from being displaced from the tobacco rod  21 . 
     According to a maximum temperature to which the susceptor  110  may be heated, the diameters of the cooling member  1110  and  1120  may be set as shown in  FIG.  11  or  12   . 
       FIG.  13    is a flowchart illustrating a method of manufacturing an aerosol generating article according to embodiments of the present disclosure. 
     Referring to  FIG.  13   , in S 1310 , the tobacco rods  21  and  31  including the susceptor  110  are provided, the susceptor having a form in which the plurality of strands are twisted together. 
     The susceptor  110  may include the plurality of wires including the plurality of wires  511 ,  512 ,  513 , and may extend in a direction. For example, the direction may indicate a longitudinal direction of the cigarettes  2  and  3 . 
     The susceptor  110  may include the first wire  511 , the second wire  512 , and the third wire  513 . The first wire  511 , the second wire  512 , and the third wire  513  may have different lengths, respectively. For example, the first wire  511  may be set to have a first length, the second wire  512  may be set to have a second length greater than the first length, and the third wire  513  may be set to have a third length greater than the second length. 
     The susceptor  110  may include the plurality of strands, and may be manufactured in the form in which at least some of the plurality of strands are twisted together. In an embodiment, the susceptor  110  may be manufactured in the form in which the first wire  511 , the second wire  512 , and the third wire  513  are twisted together. In other words, the first wire  511 , the second wire  512 , and the third wire  513  may be twisted together. Accordingly, the first wire  511 , the second wire  512 , and the third wire  513  may extend with inclination with respect to the longitudinal direction. Here, the longitudinal direction may indicate the longitudinal direction of the cigarette  200  and/or the aerosol generating device  100 . 
     The first wire  511 , the second wire  512 , and the third wire  513  may be twisted in the preset direction with respect to the longitudinal direction. For example, the first wire  511 , the second wire  512 , and the third wire  513  may be twisted in a clockwise direction. As another example, the first wire  511 , the second wire  512 , and the third wire  513  may twisted in a counter-clockwise direction. 
     As the first wire  511 , the second wire  512 , and the third wire  513  respectively have different lengths, at a certain time point, one of the wires is no more twisted with other two wires. In the method of the present disclosure, a new wire is added in consideration of the preset time point, and the susceptor  110  may be extended. 
     More particularly, the new wire  514  may be provided at a time point at which the first wire  511  is no longer twisted with the second wire  512  and the third wire  513 . For example, the preset time point may be set based on a time point at which a length of an untwisted portion is less than a reference length. The reference length may be 1 cm to 3 cm, but is not limited thereto. The new wire  514  may be twisted with the second wire  512  and the third wire  513 . Accordingly, the susceptor  110  may extend in a direction. A length of the new wire  514  may be set based on a length of a longest wire from among the first wire  511 , the second wire  512 , and the third wire  513 . For example, the length of the new wire  514  may be greater than the length of the third wire  513 . 
     The first wire  511 , the second wire  512 , and the third wire  513  may have different diameters, respectively. For example, the first wire  511  may have the first diameter r 1 , the second wire  512  may have the second diameter r 2  greater than the first diameter r 1 , and the third wire  513  may have the third diameter r 3  greater than the second diameter r 2 . 
     The first wire  511 , the second wire  512 , and the third wire  513  may be impregnated with the aerosol generating material  810 . In other words, the aerosol generating material  810  may penetrate among the plurality of wire strands. The aerosol generating material  810  may penetrate among the plurality of wire strands by being sprayed thereon. 
     According to the method of the present disclosure, for accuracy of control, a portion in which a preset number or more of wires are twisted together may be removed. For example, the preset number may include four, but is not limited thereto. 
     In an embodiment, the portion in which the preset number or more of wires are twisted together may be detected based on a weight per unit length. In another embodiment, the portion in which the preset number of more of wires are twisted together may be detected based on a change in capacity when a current is induced in the susceptor  110 . 
     The susceptor  110  may be surrounded by the tobacco material, and the tobacco material may be processed into a cylindrical object. In addition, the tobacco material and the susceptor  110  may be cut together to form the tobacco rod  21 . 
     In S 1320 , the filter rods  22  and  32  respectively arranged at an end of the tobacco rods  21  and  31  may be provided. 
     In an embodiment, the filter rod  22  and  32  may include the cooling segments  221  and  321  configured to cool the aerosol and the filter segments  222  and  322  configured to filter certain components included in the aerosol. 
     The cooling segments  221  and  321  may include the first cooling member  1110 , which allows the aerosol to pass and has the first diameter ra, and the second cooling member  1120  having the second diameter rb different from the first diameter ra. 
     According to embodiments, before S 1310 , the method may further include providing the front-end plug  33  arranged at another end of the tobacco rods  21  and  31 . The front-end plug  33  may prevent the tobacco rod  31  from being displaced to the outside, and may prevent a liquefied aerosol from flowing from the tobacco rod  31  into the aerosol generating device  100  during smoking. 
     In S 1330 , the tobacco rod  21  and the filter rod  22  may be wrapped with the wrapper  24 , and the tobacco rod  31  and the filter rod  32  may be wrapped with the wrapper  35 . 
     The perforation  26  may be formed in a region surrounding at least one of the tobacco rod  21  and the filter rod  22 , and the perforation  36  may be formed in a region surrounding at least one of the tobacco rod  31  and the filter rod  32 . 
     Those of ordinary skill in the art related to the present embodiments may understand that various changes in forms and details may be made therein without departing from the scope of the characteristics described above. The disclosed methods should be considered in a descriptive sense only and not for purpose of limitation. The scope of the present disclosure is disclosed in the appended claims rather than the descriptions, and all differences within the scope equivalent to those described in the claims will be construed as being included in the scope of the present disclosure.