KR102330290B1 - A wrapper comprising thermal insulating element - Google Patents

Abstract

According to one aspect, a wrapper for packaging at least a portion of a cigarette includes: a heat insulating layer that prevents heat from being emitted to the outside of the cigarette; and a conductive layer that allows the heat to be conducted inside the cigarette.

Description

A wrapper comprising thermal insulating element

A wrapper comprising an insulating element.

In recent years, there has been an increasing demand for an alternative method that overcomes the disadvantages of conventional cigarettes. For example, there is an increasing demand for a method of generating an aerosol as the aerosol-generating material in a cigarette is heated rather than a method of burning a cigarette to produce an aerosol. Accordingly, research into a heated cigarette or a heated aerosol generating device is being actively conducted.

Patent Document 1: Korean Patent Publication No. 10-2018-0027432 (2018. 3. 14.)
Patent Document 2: Korean Patent Publication No. 10-2018-0037019 (2018. 4. 10.)

An object of the present invention is to provide a wrapper comprising an insulating element. The technical problem to be solved is not limited to the technical problems as described above, and other technical problems may exist.

According to one aspect, a wrapper for packaging at least a portion of a cigarette includes: a heat insulating layer that prevents heat from being emitted to the outside of the cigarette; and a conductive layer that allows the heat to be conducted inside the cigarette.

In the wrapper described above, the conductive layer comprises: a pulp layer; and a metal layer, wherein the metal layer is made of at least one of aluminum, steel, iron, copper, or a metal alloy.

In the wrapper described above, the conductive layer comprises: a pulp layer; and metal particles uniformly distributed in the pulp layer, wherein the metal particles include metal flake paste.

In the above-mentioned wrapper, the metal flake paste may include: a first step of flakeizing raw aluminum powder in an organic solvent containing an aromatic hydrocarbon as a main component to obtain aluminum flakes; and a second step of treating the aluminum flakes obtained in the first step with an organic compound having a polar group and forming a paste.

In the wrapper described above, the organic compound having a polar group is selected from the group consisting of fatty acids, fatty amines, fatty acid amides, fatty alcohols, and esters consisting of fatty acids and fatty alcohols.

In the above-described wrapper, a wrapper positioned between the heat insulating layer and the conductive layer; further comprising, wherein the wrapper includes at least one of a porous wrapper and a non-porous wrapper.

A cigarette according to another aspect includes a tobacco rod comprising an aerosol generating material; at least one filter segment; and a wrapper for wrapping at least one of the tobacco rod and the at least one filter segment, the wrapper comprising: an insulating layer that prevents heat from being emitted to the outside of the at least one of the tobacco rod and the filter segment; and a conductive layer that allows the heat to be conducted within at least one of the tobacco rod and the filter segment.

Thermal conductivity may be improved on the inside of the wrapper surrounding at least a portion of the smoking article (cigarette), and heat from the inside may be prevented from being emitted to the outside on the outside. As the energy applied from the heater is emitted to the outside, heat loss does not occur, so the temperature of the tobacco rod (medium) can be uniformly maintained within a desired range. In addition, through the heat insulating effect, it is possible to prevent damage such as burns due to heat emitted to the outside of the smoking article.

1 is a view illustrating an example in which a cigarette is inserted into a holder.
2 is a configuration diagram illustrating an example of a cigarette.
3 is a view for explaining an example of a wrapper including a conductive layer and a heat insulating layer.
4 is a view for explaining another example of a wrapper including a conductive layer and a heat insulating layer.

Terms used in the embodiments are selected as currently widely used general terms as possible while considering functions in the present invention, but may vary according to intentions or precedents of those of ordinary skill in the art, emergence of new technologies, and the like. In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than the name of a simple term.

In the entire specification, when a part “includes” a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a view illustrating an example in which a cigarette is inserted into a holder.

Referring to FIG. 1 , a cigarette 2 may be inserted into a holder 1 . When the cigarette 2 is inserted, the heater 130 is positioned inside the cigarette 2 . Accordingly, the aerosol-generating material of the cigarette 2 is heated by the heated heater 130 , thereby generating an aerosol.

The cigarette 2 may have a shape similar to that of a general combustion type cigarette. For example, the cigarette 2 may be divided into a first portion 210 including an aerosol generating material and a second portion 220 including a filter and the like.

The entire first part 210 may be inserted into the holder 1 , and the second part 220 may be exposed to the outside. Alternatively, only a portion of the first portion 210 may be inserted into the holder 1 , or portions of the first portion 210 and the second portion 220 may be inserted.

The user may inhale the aerosol while biting the second part 220 with the mouth. At this time, the aerosol is generated by the external air passing through the first portion 210, the generated aerosol is passed through the second portion 220 is delivered to the user's mouth.

External air may be introduced through at least one air passage formed in the holder 1 . Alternatively, external air may be introduced through at least one hole formed in the surface of the cigarette 2 .

2 is a configuration diagram illustrating an example of a cigarette.

Referring to FIG. 2 , the cigarette 2 includes a tobacco rod 210 , a first filter segment 221 , a cooling structure 222 and a second filter segment 223 . The first part described above with reference to FIG. 1 includes a tobacco rod 210 , and the second part includes a first filter segment 221 , a cooling structure 222 and a second filter segment 223 .

Referring to FIG. 2 , the cigarette 2 may be wrapped by wrappers 231 , 232 , 233 , 234 , 235 and 236 . For example, the tobacco rod 210 is wrapped by a first wrapper 231 , and the first filter segment 221 is wrapped by a second wrapper 232 . Further, the cooling structure 222 is wrapped by a third wrapper 233 , and the second filter segment 223 is wrapped by a fourth wrapper 234 .

The fifth wrapper 235 may be surrounded by the first wrapper 231 , the second wrapper 232 , and the third wrapper 233 . In other words, the tobacco rod 210 , the first filter segment 221 and the cooling structure 222 of the cigarette 2 may be further wrapped by the fifth wrapper 235 . In addition, the sixth wrapper 236 may be surrounded by at least a portion of the fifth wrapper 235 and the outside of the fourth wrapper 234 . In other words, at least a portion of the cooling structure 222 of the cigarette 2 and the second filter segment 223 may be further wrapped by the sixth wrapper 236 .

The first wrapper 231 , the second wrapper 232 , the fifth wrapper 235 , and the sixth wrapper 236 may be made of general wrapping paper. For example, the first wrapper 231 , the second wrapper 232 , the fifth wrapper 235 , and the sixth wrapper 236 may be porous or non-porous wrappers. For example, the thickness of the first wrapper 231 may be about 61 μm and the porosity may be about 15 CU, and the thickness of the second wrapper 232 may be about 63 μm and the porosity may be about 15 CU, but is not limited thereto. . In addition, the thickness of the fifth wrapper 236 may be about 66 μm and the porosity may be about 10 CU, and the thickness of the sixth wrapper 236 may be 66 μm and the porosity may be about 17 CU, but is not limited thereto.

In addition, an aluminum foil may be further included on the inner surface of the first wrapper 231 and/or the second wrapper 232 .

The third wrapper 233 and the fourth wrapper 234 may be made of hard wrapping paper. For example, the thickness of the third wrapper 233 may be about 158 μm and the porosity may be about 33 CU, and the thickness of the fourth wrapper 234 may be about 155 μm and the porosity may be about 46 CU, but is not limited thereto. .

A predetermined material may be internally added to the fifth wrapper 235 and the sixth wrapper 236 . Here, an example of the predetermined material may be silicon, but is not limited thereto. For example, silicon has characteristics such as heat resistance with little change with temperature, oxidation resistance without oxidation, resistance to various chemicals, water repellency against water, or electrical insulation. However, even if it is not silicon, any material having the above-described characteristics may be applied (or coated) to the fifth wrapper 235 and the sixth wrapper 236 without limitation.

The fifth wrapper 235 and the sixth wrapper 236 may prevent the cigarette 2 from burning. For example, when the tobacco rod 210 is heated by the heater 130, there is a possibility that the cigarette 2 is burned. Specifically, when the temperature rises above the ignition point of any one of the materials included in the tobacco rod 210, the cigarette 2 may be burned. Even in this case, since the fifth wrapper 235 and the sixth wrapper 236 include a non-combustible material, the burning phenomenon of the cigarette 2 can be prevented.

In addition, the fifth wrapper 235 may prevent the holder 1 from being contaminated by substances produced in the cigarette 2 . By the user's puff, liquid substances may be created in the cigarette 2 . For example, liquid substances (eg, moisture, etc.) may be generated by cooling the aerosol generated in the cigarette 2 by the outside air. As the fifth wrapper 235 wraps the tobacco rod 210 and/or the first filter segment 221 , the liquid substances produced in the cigarette 2 will be prevented from leaking out of the cigarette 2 . can Accordingly, the phenomenon that the inside of the holder 1 is contaminated by the liquid substances produced in the cigarette 2 can be prevented.

The diameter of the cigarette 2 is within the range of 5 mm to 9 mm, and the length may be about 45 mm, but is not limited thereto. For example, the length of the tobacco rod 210 is about 11.5 mm, the length of the first filter segment 221 is about 8 mm, the length of the cooling structure 222 is about 18.5 mm, and the length of the second filter segment 223 is about 18.5 mm. may be about 7 mm, but is not limited thereto.

The structure of the cigarette 2 shown in FIG. 2 is only an example, and some components may be omitted. For example, the cigarette 2 may not include one or more of the first filter segment 221 , the cooling structure 222 , and the second filter segment 223 .

Tobacco rod 210 contains an aerosol generating material. For example, the aerosol generating material may comprise at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol and oleyl alcohol.

In addition, the tobacco rod 210 may contain other additives such as flavoring agents, wetting agents and/or organic acids. For example, flavoring agents include licorice, sucrose, fructose syrup, isosweet, cocoa, lavender, cinnamon, cardamom, celery, fenugreek, cascarilla, sandalwood, bergamot, geranium, honey essence, rose oil, vanilla, lemon oil, orange oil, mint oil, cinnamon, caraway, cognac, jasmine, chamomile, menthol, cinnamon, ylang-ylang, sage, spearmint, ginger, coriander or coffee and the like. In addition, the wetting agent may include glycerin or propylene glycol, and the like.

As an example, the tobacco rod 210 may be filled with a reconstituent 　tobacco sheet.

As another example, the tobacco rod 210 may be filled with cut filler. Here, tobacco cut fillers can be produced by chopping leaflet sheets.

As another example, the tobacco rod 310 may be filled with a plurality of tobacco strands in which the leaflet sheet is chopped. For example, the tobacco rod 310 may be formed by combining a plurality of tobacco strands in the same direction (parallel) to each other or randomly.

For example, the plate-like sheet may be manufactured by the following process. First, the tobacco raw material is pulverized to form an aerosol-generating material (eg, glycerin, propylene glycol, etc.), a flavoring solution, a binder (eg, guar gum, xanthan gum, carboxymethyl cellulose (CMC), etc.), water After making a slurry in which the etc. are mixed, a plate-like sheet is formed using the slurry. When making the slurry, natural pulp or cellulose may be added, and one or more binders may be mixed and used. On the other hand, tobacco strands may be produced by cutting or shredding the dried leaflet sheet.

The tobacco raw material may be tobacco leaf flakes, tobacco stems and/or tobacco fines generated during tobacco processing. In addition, the lamellar sheet may contain other additives such as wood cellulose fibers.

5% to 40% of the aerosol generating material may be added to the slurry, and 2% to 35% of the aerosol generating material may remain in the plate-like sheet. Preferably, 5% to 30% of the aerosol generating material may remain in the leaflet sheet.

In addition, before the process in which the tobacco rod 210 is packaged by the first wrapper 231 , a flavoring liquid such as menthol or a moisturizer may be sprayed and added to the center of the tobacco rod 210 .

The first filter segment 221 may be a cellulose acetate filter. For example, the first filter segment 221 may be a tube-shaped structure including a hollow therein. The length of the first filter segment 221 may be an appropriate length within the range of 4 mm to 30 mm, but is not limited thereto. Preferably, the length of the first filter segment 221 may be 8 mm, but is not limited thereto.

The diameter of the hollow included in the first filter segment 221 may be an appropriate diameter within the range of 2 mm to 4.5 mm, but is not limited thereto.

When the first filter segment 221 is manufactured, the hardness of the first filter segment 221 may be adjusted by adjusting the content of the plasticizer.

In addition, the first filter segment 221 may be manufactured by inserting a structure such as a film or a tube made of the same or different material inside (eg, hollow).

The first filter segment 221 may be manufactured using cellulose acetate. Accordingly, when the heater 130 is inserted, the inner material of the tobacco rod 210 may be prevented from being pushed back, and a cooling effect of the aerosol may be generated.

The cooling structure 222 cools the aerosol generated by the heater 130 heating the tobacco rod 210 . Thus, the user can inhale the aerosol cooled to a suitable temperature.

The length or diameter of the cooling structure 222 may be variously determined according to the shape of the cigarette 2 . For example, the length of the cooling structure 222 may be appropriately employed within the range of 7 mm to 20 mm. Preferably, the length of the cooling structure 222 may be about 18.5 mm, but is not limited thereto.

The cooling structure 222 may be formed by a crimped polymer sheet. Here, the polymer sheet is selected from the group consisting of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA) and aluminum foil. It can be made of material. As the cooling structure 222 is formed by the crimped polymer sheet, the cooling structure 222 may include a plurality of channels extending in the longitudinal direction. Here, a channel means a passage through which a gas (eg, air or aerosol) passes.

For example, the cooling structure 222 may be formed from a material having a thickness of between about 5 μm and about 500 μm, such as between about 10 μm and about 250 μm. Also, the total surface area of the cooling structure 222 may be between ^{about 300 mm 2} /mm and about 1000 mm ^{2 /mm.} Further, the aerosol cooling element may be formed from a material having a specific surface area of between about 10 mm ² /mg and about 100 mm ^{2 /mg.}

Meanwhile, the cooling structure 222 may include a thread containing a volatile flavor component. Here, the volatile flavor component may be menthol, but is not limited thereto. For example, the thread may be filled with a sufficient amount of menthol to provide at least 1.5 mg of menthol to the cooling structure 222 .

The second filter segment 223 may be a cellulose acetate filter. The length of the second filter segment 223 may be appropriately employed within the range of 4 mm to 20 mm. For example, the length of the second filter segment 223 may be about 7 mm, but is not limited thereto.

In the process of manufacturing the second filter segment 223 , the flavor may be generated by spraying a flavoring liquid on the second filter segment 223 . Alternatively, a separate fiber coated with a flavoring liquid may be inserted into the second filter segment 223 . The aerosol generated by the tobacco rod 210 is cooled as it passes through the cooling structure 222 , and the cooled aerosol is delivered to the user through the second filter segment 223 . Accordingly, when the flavoring element is added to the second filter segment 223 , the effect of enhancing the durability of the flavor delivered to the user may occur.

As shown in FIG. 1 , in the case of a cigarette 2 that generates an aerosol through heating of the heater 130 , the temperature of the cigarette 2 has a significant effect on the degree to which the aerosol is generated. In order to deliver an optimal aerosol to the user, it is preferable to maintain the temperature of the cigarette 2 (specifically, the tobacco rod 210) within a predetermined range.

The heating of the cigarette 2 in the heated aerosol-generating device 1 is effected mainly by conductive heat transfer through a heat-conducting element. In this case, the temperature of the cigarette 2 can be sensitively changed according to the temperature change of the heat-conducting element.

As described above with reference to FIG. 1 , as the heater 130 is heated, the temperature of the cigarette 2 rises. Accordingly, if a separate heat insulating element is not employed in the cigarette 2 , the high temperature is transferred to the portion of the cigarette 2 that comes into contact with the user's lips (that is, the second portion 220 ) as it is. Accordingly, heat generated by the heater 130 and heat applied to the cigarette may be added to negatively affect the user's normal smoking.

In the wrapper (at least one of the first wrapper 231 to the sixth wrapper 236 in FIG. 2 ), an element for improving heat conduction efficiency inside the cigarette 2 may be employed. For example, the wrapper and aluminum foil may be laminated. However, this may be insufficient to reduce the loss of thermal energy generated as heat is emitted to the outside of the cigarette 2 .

Based on the tobacco rod 210 (that is, the medium), heat conduction efficiency is improved on the inside so that the temperature is maintained uniformly, and the internal heat does not escape to the outside so as not to cause damage to the user due to high temperature. There is a need. Therefore, the wrapper according to an embodiment is a conductive layer (ie, a layer that allows heat to be conducted inside the cigarette 2) and a heat insulating layer (ie, a layer that prevents heat from being emitted to the outside of the cigarette 2) is a complex is applied as Hereinafter, examples of a wrapper according to an embodiment will be described with reference to FIGS. 3 to 4 .

3 is a view for explaining an example of a wrapper including a conductive layer and a heat insulating layer.

Referring to FIG. 3 , the wrapper 300 includes a heat insulating layer 310 and a conductive layer 320 . The wrapper 300 shown in FIG. 3 may be any one of the first wrappers 231 to the sixth wrappers 236 of FIG. 2 .

For example, the heat insulating layer 310 may be made of sol-gel, airgel, or foamed ceramic, and may be manufactured by additionally coating a heat insulating material if necessary. However, the heat insulating layer 320 is not limited to the above-described example, and may be employed without limitation as long as it prevents heat from being emitted to the outside.

The heat insulating layer 310 may be made of a single material or a combination of several materials so that the flow of heat by conduction, convection, and radiation can be reduced. For example, the insulating layer 310 may be formed of fibers, particulates, membranes, blocks or air layers, open or closed cells, or combinations thereof. For example, as a material of the heat insulating layer 310, an organic heat insulating material such as expanded polystyrene, expanded polyurethane, extruded expanded polystyrene, polyethylene, or an inorganic heat insulating material such as glass surface or mineral surface may be used, but is not limited thereto.

In addition, cellulose may be used as a material of the heat insulating layer 310 . Here, cellulose can be obtained from recycled paper or wood fibers, and the thermal conductivity is 40-50 mW/mK, which can be changed according to temperature, moisture content, and density. For example, the thermal conductivity of cellulose may be increased to 40 to 66 mW/mK as the water content increases to 0 to 5 vol%. In addition, wood, carbon steel, stainless steel, aluminum, ceramic, glass, loess, airgel, other phase change materials, etc. may be used as a material of the heat insulating layer 310 . The heat insulating layer 310 may be formed by depositing, laminating, spraying, coating, or laminating the above-described material on the conductive layer 320 .

For example, the conductive layer 320 may be made of aluminum, steel, iron, copper, or a metal alloy. However, the conductive layer 320 is not limited to the above-described example, and may be employed without limitation as long as it can conduct heat.

4 is a view for explaining another example of a wrapper including a conductive layer and a heat insulating layer.

Referring to FIG. 4 , the wrapper 400 includes a heat insulating layer 410 and a conductive layer 420 . The wrapper 400 illustrated in FIG. 4 may be any one of the first wrappers 231 to the sixth wrappers 236 of FIG. 2 . Also, the heat insulating layer 410 of FIG. 4 is the same as the heat insulating layer 310 of FIG. 3 . Therefore, a detailed description of the heat insulating layer 410 will be omitted below.

Referring to FIG. 4A , the conductive layer 420 may include a metal layer 421 and a pulp layer 422 . For example, the metal layer 421 may be made of aluminum, steel, iron, copper, or a metal alloy. However, the metal layer 421 is not limited to the above-described example, and may be employed without limitation as long as it can conduct heat.

Referring to FIG. 4B , the conductive layer 420 may include a pulp layer 422 and metal particles 421 distributed in the pulp layer 422 . Here, the metal particles 421 mean a metal flake paste.

The metal particles 421 (ie, metal flake paste) are uniformly distributed in the pulp layer 422 . For example, the metal particles 421 may be mixed and sprayed with pulp raw material and the metal particles 421 during the production process of the base paper, or impregnated and spray coated with the metal particles 421 during the production line. Accordingly, a wrapper having excellent thermal conductivity may be manufactured. Here, since the method of manufacturing the base paper is obvious to those of ordinary skill in the art, a detailed description thereof will be omitted. In order to make the metal particles 421 densely dispersed in the above-described mixing process, a method such as high-speed stirring or ultrasonic stirring (homo mixer) may be used. In addition, the thermal conductivity of the wrapper 400 may be increased by adjusting the concentration of the metal particles 421 .

Hereinafter, the manufacturing process of the metal particle 421 (ie, metal flake paste) is demonstrated.

The manufacturing process of the metal flake paste is a first step of flakes metal powder in an organic solvent containing an aromatic hydrocarbon to obtain metal flakes, and the metal flakes obtained in the first step are treated with an organic compound having a polar group, and the paste is formed a second step of

Here, the metal flake paste may be made of aluminum, steel, iron, copper, or a metal alloy, but the raw material of the metal flake paste is not limited to the above-mentioned bar. For convenience of description, the metal flake paste is hereinafter described as an aluminum flake paste. However, the manufacturing process of the aluminum flake paste, which will be described later, may be substituted with another manufacturing process of the metal flake paste.

The first step is a step of obtaining aluminum flakes by flaking raw aluminum powder in an organic solvent containing an aromatic hydrocarbon as a main component. Hereinafter, the raw material used in a 1st process, conditions of a 1st process, etc. are demonstrated.

A grinding device having a grinding media is used for flaking the raw aluminum powder. Here, "flaking" means shaping|molding particulate-form powder into flake form (flaky form) using a grinding|polishing apparatus etc. here. The kind in particular is not limited about the grinding|polishing apparatus used in this invention, A conventionally well-known grinding|polishing apparatus can be used suitably. For example, an attritor-type grinding device equipped with a rotary arm inside, a cylindrical ball mill, etc. can be used preferably. Among the above-mentioned grinding devices, a cylindrical ball mill is particularly preferable because it is possible to obtain aluminum flakes of higher luminance and quality.

Moreover, in the manufacturing method of this invention, when using a ball mill, it is preferable that the rotation speed of a ball mill shall be 95% or less of critical rotation speed. The critical rotational speed as used herein refers to the rotational speed at which the ball (grinding media) is fixed to the inner wall of the ball mill by centrifugal force when the rotational speed is increased more than that, and is expressed by the following formula (1).

In Equation 1, n is the rotation speed (rpm), g is the acceleration due to gravity (3528000 cm/min ² ), and r is the ball mill radius (cm).

When the rotation speed of the ball mill exceeds 95% of the critical rotation speed, the grinding effect is stronger than the grinding effect, and sufficient flake formation cannot be achieved. It shows the tendency for the brightness|luminance of the coating film to contain. In particular, in the case of using grinding media of steel balls having a diameter of 1 mm or less, when the rotation speed of the ball mill approaches the critical rotation speed, the impact force due to collision between the grinding media increases, so the life of the grinding media is short. This tends to make continuous use difficult. This is because the hardening coating film is not generally formed on the said surface in the grinding media of the steel ball whose diameter is 1 mm or less. By maintaining the rotation speed of the ball mill at 95% or less of the critical rotation speed, the life of the grinding media can be increased.

The grinding time is not particularly limited, and may be appropriately determined according to the diameter of the grinding media, the mass of the grinding media, the amount and rotational speed of the grinding solvent, and the like. Usually, it is between 3 and 48 hours.

The grinding media is not particularly limited, and various materials such as steel balls, stainless spheres, glass spheres, and ceramic spheres can be used.狀) Media is preferred.

In addition, although it is preferable that the grinding|polishing media to be used is spherical, it does not necessarily need to be a true spherical grinding|polishing media, and may be a substantially spherical grinding|polishing media. Further, the size of the grinding media may be appropriately selected depending on the aluminum flake to be finally obtained. For example, the size of the grinding media is preferably in the range of 0.3 mm to 5.0 mm. In addition, as a grinding media, you may mix and use 2 or more types of grinding media from which a diameter differs. Moreover, the grinding media with a diameter exceeding 1.0 mm may be contained in the grinding|polishing apparatus used for this invention. The amount of the grinding media may be changed in accordance with the amount of the raw material powder (eg, aluminum powder) to be fed into the grinding apparatus, as will be described later.

For example, the raw material aluminum powder used as a raw material of an aluminum flake paste is not specifically limited, The composition may be comprised only with aluminum, may be comprised from an aluminum-based alloy, and the purity of aluminum is not specifically limited. In order to make the gloss of a coating film and a printed material higher, it is generally preferable to use pure aluminum, and if it is aluminum with a purity of 99.9 mass % or more, it is still more preferable.

In a 1st process, in order to take out an aluminum flake after flake-forming a raw material aluminum powder and obtaining an aluminum flake, you may perform solid-liquid separation operation, such as filtration operation or screen operation. For example, after flaking (grinding), the slurry containing aluminum flakes in the ball mill is washed with mineral spirits and hung on a vibrating screen, the passed slurry is separated into solid-liquid with a pan filter, and aluminum flakes (however, as a filter cake) ) can be obtained. Here, a "filter cake" means the semi-solid substance which remains after removing the organic solvent containing an aromatic hydrocarbon. In the filtration operation or the screen operation, the grinding media may be removed from the organic solvent containing the aromatic hydrocarbon.

In addition, filtration operation or screen operation is not limited in a 1st process, In each process mentioned later, it is also possible to perform suitably.

In a 1st process, after flaking a raw material aluminum powder and obtaining aluminum flakes, you may change the organic solvent containing an aromatic hydrocarbon as a main component to a different solvent by solvent substitution or solvent addition. At this time, the organic solvent containing an aromatic hydrocarbon as a main component can be changed to the solvent with lower solubility with respect to the "organic compound which has a polar group" mentioned later. Thereby, in the 2nd process mentioned later, dissolution of the organic compound which has a polar group with respect to a solvent can be suppressed more. As will be described later, the organic compound having a polar group has the effect of improving the storage stability of the aluminum flake paste in any case, even if it is attached to the surface of the aluminum flake or contained in the solvent, but in a state attached to the surface of the aluminum flake. It is more preferable in terms of improving storage stability. Therefore, by changing the solvent, dissolution of the organic compound having a polar group in the solvent can be suppressed, the amount of adhesion to the aluminum flake surface can be increased, and the effect of protecting the aluminum flake surface can be improved.

The second step is a step of treating the aluminum flakes obtained in the first step with an organic compound having a polar group, and further forming a paste. Here, "treatment with an organic compound having a polar group" is a process aimed at making the organic compound having a polar group adhere to the surface of the aluminum flake. In addition, when a 2nd process is performed in the state which added the pasting solvent to aluminum flakes, while adhering to the aluminum flake surface, the organic compound which has this polar group may be contained in the pasting solvent. Hereinafter, the raw materials, conditions, etc. used in the 2nd process are demonstrated.

In a 2nd process, operation of processing the aluminum flake obtained by the 1st process with the organic compound which has a polar group is performed.

When an organic solvent containing an aromatic hydrocarbon as a main component is used as the grinding solvent, the solubility in fatty acids such as oleic acid and stearic acid is higher than when an aliphatic hydrocarbon (typically mineral spirit) is used as the grinding solvent. . Fatty acids such as oleic acid and stearic acid are added as grinding aids at the time of flaking (grinding), and are attached to the surface of aluminum flakes after flaking, providing parallel alignment of aluminum flakes, suppression of aggregation, protection of the surface of aluminum flakes fulfill roles such as However, as the solubility to the grinding solvent increases, the amount of fatty acids attached to the surface of the aluminum flakes decreases as a result. Therefore, aggregation etc. by time lapse will generate|occur|produce, and the storage stability of an aluminum flake paste will fall. However, in the production method of the present invention, the storage stability of the aluminum flake paste can be improved by treating the aluminum flake obtained in the first step with an organic compound having a polar group.

That is, the manufacturing method of this invention shows the outstanding effect of being able to obtain the aluminum flake paste with favorable storage stability. It is because generation|occurrence|production of the aggregation of aluminum flakes in an aluminum flake paste is suppressed by processing with the organic compound which has a polar group.

As described above, even if the organic compound having a polar group adheres to the surface of the aluminum flake or is contained in the paste-forming solvent, it has an effect of improving the storage stability. However, in order to improve storage stability, it is more preferable that the organic compound having a polar group is in a state attached to the surface of the aluminum flake.

The organic compound having a polar group used in the production method of the present invention is, for example, an organic compound having a polar group such as a hydroxyl group, a carboxyl group, an amino group, an amide group (amide bond), an ester group (ester bond), etc. The chemical structure is not particularly limited. Preferably, at least one organic compound selected from the group consisting of fatty acids, fatty amines, fatty acid amides, fatty alcohols, and esters of fatty acids and fatty alcohols may be used. The organic compound having a polar group may be the same as or different from the compound added as a grinding aid in the first step.

Examples of the fatty acid include caprylic acid, capric acid, lauric acid, myristic acid, oleic acid, stearic acid, linoleic acid, arachidonic acid, and behenic acid. Examples of the aliphatic amine include laurylamine, myristateamine, palmitylamine, and stearylamine. Examples of the fatty acid amide include lauric acid amide, palmitic acid amide, oleic acid amide, stearic acid amide, and behenic acid amide. Moreover, as an aliphatic alcohol, caprylic alcohol, lauryl alcohol, myristeel alcohol, oleyl alcohol, stearyl alcohol, behenyl alcohol, etc. are mentioned, for example. Moreover, as ester which consists of fatty acid and an aliphatic alcohol, For example, methyl laurate, methyl oleate, methyl stearate, octyl stearate, isopropyl myristate, butyl stearate, octyl palmitate, octyl oleate, pal. Isopropyl mitate etc. are mentioned.

In the 2nd process, "to paste" means to raise the viscosity of the slurry containing the aluminum flakes in the 1st process (when aluminum flakes are obtained as a filter cake, it is made into a highly viscous fluid ) says This operation is usually carried out by adding a pasting solvent, but when the viscosity of the mixed system is high when processing by adding an organic compound having a polar group to aluminum flakes, the solvent constituting the mixed system is used as a pasting solvent. Considering this, it is not necessary to add a separate pasting solvent. When the viscosity of the mixed system is low when processing by adding an organic compound having a polar group to aluminum flakes, by adding a pasting solvent to the mixed system or replacing the solvent constituting the mixed system with the pasting solvent, may increase the viscosity of

Here, the "pasteization solvent" refers to a compound mixed with aluminum flakes in order to form a paste. As the pasting solvent, an organic solvent containing an aromatic hydrocarbon as a main component used in the first step, or when the second step contains a solvent, the solvent may be used as a pasting solvent as it is, as described above. A different solvent may be used as the pasting solvent by the same solvent addition or solvent substitution. Although the material of the paste-forming solvent is not specifically limited, In addition to the organic solvent containing an aliphatic hydrocarbon (for example, mineral spirit) and an aromatic hydrocarbon as a main component, a glycol ether type solvent etc. can be used. In addition, the content of the pasting solvent in the aluminum flake paste is not particularly limited, but if it is in the range of 15 mass % or more and 50 mass % or less, the storage stability can be further improved, and the aluminum flakes in the paint at the time of forming a paint. It is preferable at the point which can improve the dispersibility of. It is more preferable in it being the range of 25 mass % or more and 40 mass % or less.

Meanwhile, in addition to the first and second processes described above, a process of adding an antioxidant may be further included. Among the grinding aids such as fatty acids adhering to the surface of aluminum flakes, or organic compounds having a polar group, those having an unsaturated double bond in their structure may undergo a radical reaction to be modified or polymerized (modification) has a By this deterioration, aluminum flakes may aggregate|aggregate, or a bad influence may be given to parallel arrangement|sequence of aluminum flakes, and a brightness|luminance may fall.

By adding an antioxidant, these deteriorations can be stopped or suppressed. At which stage of the manufacturing process the operation of adding the antioxidant is performed, it can be appropriately determined according to the kind of the grinding aid added to the aluminum flakes and the organic compound having a polar group. Specifically, when an unsaturated fatty acid or the like having an unsaturated double bond in its structure and easily causing a radical reaction is used as a grinding aid, an antioxidant may be added during flaking in the first step. In the second step, when an organic compound having a polar group that has an unsaturated double bond in its structure and is easy to cause a radical reaction is used, an antioxidant may be added during the second step or after the second step is completed.

As the antioxidant that can be used in the present invention, any compound can be used as long as it has a function of stopping the radical chain reaction by supplying electrons or hydrogen atoms to radicals generated by the modification of the unsaturated fatty acid or the like. Representative antioxidants that can be used in the present invention include synthetic antioxidants and natural antioxidants such as phenol compounds, substituted compounds having a carbonyl group and a hydroxyl group, aromatic amino compounds, organic sulfur compounds, phosphite compounds, etc. have.

In addition, as long as the first process and the second process are included, various other processes may be further included. For example, processes, such as solid-liquid separation processes, such as filtration operation or screen operation, etc. are mentioned.

The composition of the aluminum flake is the same as the composition of the raw material aluminum powder in the method for producing the aluminum flake paste described above. That is, although the composition of an aluminum flake is not specifically limited, It may be comprised only with aluminum, and may be comprised from an aluminum-based alloy. The purity of the aluminum is not particularly limited, either, but in order to increase the gloss of the coating film and printed matter containing the aluminum flake paste, it is usually preferably pure aluminum, and more preferably pure aluminum having a purity of 99.9 mass% or more.

Although it does not specifically limit about content of the aluminum flake in an aluminum flake paste, Storage stability can be improved as it is 50 mass % or more and 85 mass % or less with respect to an aluminum flake paste, Moreover, aluminum in a coating material at the time of paint formation. It is preferable because the effect that the dispersibility of flakes can be improved can be acquired. Moreover, it is more preferable in it being 60 mass % or more and 75 mass % or less.

The aluminum flakes of the present invention include aluminum flakes having a surface area of 250 µm 2 or more.

In the aluminum flake paste of the present invention, another additive may be included as long as it does not impair the effects of the present invention. Such an additive may adhere to the surface of an aluminum flake, and may be contained in an aluminum flake paste.

As such other additives, for example, as described in the manufacturing method of the above-mentioned aluminum flake paste, antioxidants are mentioned, and various compounds for imparting water resistance, chemical resistance and weather resistance are mentioned. can

Referring to FIG. 4C , the wrapper 400 may further include a general wrapper 430 in addition to the heat insulating layer 410 and the conductive layer 420 . For example, a wrapper 430 may be further included between the heat insulating layer 410 and the conductive layer 420 of the wrapper 400 . Here, the wrapper 430 may be a porous wrapper or a non-porous wrapper. Also, the wrapper 430 may be a hard wrapper. The above-described porous wrapping paper, non-porous wrapping paper and hard wrapping paper are the same as described above with reference to FIG. 2 .

Those of ordinary skill in the art related to the present embodiment will understand that it can be implemented in a modified form within a range that does not deviate from the essential characteristics of the above description. Therefore, the disclosed methods are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

1: Holder
110: battery
120: control unit
2: Cigarette
210: first part
220: second part

Claims (7)

A wrapper for packaging at least a portion of a cigarette, comprising:
a heat insulating layer that prevents heat from being emitted to the outside of the cigarette; and
a conductive layer for allowing the heat to be conducted inside the cigarette;
The conductive layer is
pulp layer; and
An aluminum flake paste uniformly distributed inside the pulp layer,
The aluminum flake paste is a wrapper comprising an organic compound having a polar group attached to the surface of the aluminum flake. delete delete The method of claim 1,
The aluminum flake paste,
a first step of flaking raw aluminum powder in an organic solvent containing an aromatic hydrocarbon as a main component to obtain the aluminum flake; and
A wrapper produced by a method comprising: treating the aluminum flakes obtained in the first step with the organic compound having a polar group and forming a paste. The method of claim 1,
The polar group-containing organic compound is at least one selected from the group consisting of fatty acids, fatty amines, fatty acid amides, fatty alcohols, and esters consisting of fatty acids and fatty alcohols. The method of claim 1,
Further comprising; a wrapper positioned between the heat insulating layer and the conductive layer;
The wrapper includes at least one of a porous wrapper and a non-porous wrapper. a tobacco rod comprising an aerosol generating material;
at least one filter segment; and
a wrapper for wrapping at least one of the tobacco rod and the at least one filter segment;
The rapper is
an insulating layer that prevents heat from escaping to the outside of at least one of the tobacco rod and the filter segment; and
a conductive layer allowing the heat to be conducted within at least one of the tobacco rod and the filter segment;
The conductive layer is
pulp layer; and
An aluminum flake paste uniformly distributed inside the pulp layer,
The aluminum flake paste is a cigarette comprising an organic compound having a polar group attached to the surface of the aluminum flake.

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