KR20200030366A - A wrapper comprising thermal insulating element - Google Patents

Abstract

According to one aspect, a wrapper packaging at least a portion of a cigarette comprises a heat insulating layer to prevent heat from being released to the outside of the cigarette; and a conductive layer allowing the heat to be conducted inside the cigarette.

Description

A wrapper comprising thermal insulating element

It relates to a wrapper comprising an insulating element.

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

It 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, the wrapper packaging at least a portion of the cigarette, the heat insulating layer to prevent heat from being released to the outside of the cigarette; And a conductive layer that allows the heat to be conducted inside the cigarette.

In the above-mentioned wrapper, the conductive layer includes 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 above-mentioned wrapper, the conductive layer includes a pulp layer; And metal particles uniformly distributed inside the pulp layer. The metal particles include a metal flake paste.

In the above-mentioned wrapper, the metal flake paste comprises: a first step of flaking 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 and pasting the aluminum flakes obtained in the first step with an organic compound having a polar group.

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

In the above-mentioned wrapper, a wrapper located between the heat insulating layer and the conductive layer; and further includes, 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 wrapping at least one of the tobacco rod and the at least one filter segment, the wrapper comprising: an insulating layer preventing heat from being discharged to at least one of the tobacco rod and the filter segment; And a conductive layer that allows the heat to be conducted inside 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 on the inside may be prevented from being discharged to the outside. As the energy applied from the heater is released 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 insulation 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 showing an example in which a cigarette is inserted into the holder.
2 is a block diagram showing 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.

The terminology used in the embodiments has been selected for general terms that are currently widely used while considering functions in the present invention, but this may vary depending on the intention or precedent of a person skilled in the art or the appearance of new technologies. In addition, in certain cases, some terms are arbitrarily selected by the applicant, and in this case, their meanings will be described in detail in the description of the applicable invention. Therefore, the terms used in the present invention should be defined based on the meanings of the terms and the contents of the present invention, not simply the names of the terms.

When a certain part of the specification “includes” a certain component, this means that other components may be further included instead of excluding the other component, unless specifically stated to the contrary.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily practice. However, the present invention can be implemented in many 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 showing an example in which a cigarette is inserted into the holder.

1, the cigarette 2 can be inserted into the holder (1). When the cigarette 2 is inserted, the heater 130 is located inside the cigarette 2. Therefore, the aerosol-generating material of the cigarette 2 is heated by the heated heater 130, and accordingly, an aerosol is generated.

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

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

The user may inhale the aerosol in the state where the second part 220 is opened by mouth. At this time, the aerosol is generated by the external air passing through the first portion 210, and the generated aerosol passes through the second portion 220 and 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 on the surface of the cigarette 2.

2 is a block diagram showing 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 portion described above with reference to FIG. 1 includes a tobacco rod 210, and the second portion includes a first filter segment 221, a cooling structure 222, and a second filter segment 223.

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

The fifth wrapper 235 may be enclosed around the first wrapper 231, the second wrapper 232, and the third wrapper 233. In other words, the cigarette rod 210 of the cigarette 2, the first filter segment 221, and the cooling structure 222 may be further packaged by the fifth wrapper 235. Also, the sixth wrapper 236 may be surrounded by at least a portion of the fifth wrapper 235 and the outer periphery 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 packaged by a 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 wrapper or non-porous wrapper. For example, the thickness of the first wrapper 231 may be about 61 μm, the porosity may be about 15 CU, 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. . Further, the thickness of the fifth wrapper 236 may be about 66 μm, 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, aluminum foil may be further included on the inner surfaces 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 wrapper. For example, the thickness of the third wrapper 233 may be about 158 μm, the porosity may be about 33 CU, 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. .

The fifth wrapper 235 and the sixth wrapper 236 may be impregnated with a predetermined material. Here, as an example of a predetermined material, silicon may be applicable, but is not limited thereto. For example, silicone has characteristics such as heat resistance with little change with temperature, oxidation resistance without oxidation, resistance to various chemicals, water repellency to water, or electrical insulation. However, even if it is not silicon, any material having the above-described properties 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 can prevent the cigarette 2 from burning. For example, when the cigarette 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 substances included in the cigarette rod 210, the cigarette 2 may be burned. Even in this case, since the fifth wrapper 235 and the sixth wrapper 236 contain a non-combustible material, the phenomenon that the cigarette 2 is burned can be prevented.

In addition, the fifth wrapper 235 can prevent the holder 1 from being contaminated by substances generated in the cigarette 2. By the user's puff, liquid substances can be produced in the cigarette 2. For example, the aerosol generated in the cigarette 2 is cooled by external air, whereby liquid substances (eg, moisture, etc.) may be generated. As the fifth wrapper 235 wraps the tobacco rod 210 and / or the first filter segment 221, the liquid substances generated in the cigarette 2 can be prevented from leaking out of the cigarette 2 You can. Therefore, the phenomenon that the inside of the holder 1 is contaminated by the liquid substances generated 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, the length of the second filter segment 223 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, one or more of the first filter segment 221, the cooling structure 222, and the second filter segment 223 may not be included in the cigarette 2.

Cigarette rod 210 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.

In addition, the tobacco rod 210 may contain other additives such as flavoring agents, wetting agents and / or organic acids. For example, flavoring agents are 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. In addition, the wetting agent may include glycerin or propylene glycol.

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

As another example, the tobacco rod 210 may be filled with cuts. Here, tobacco cuts can be produced by finely cutting the leaflet sheet.

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

For example, the leaflet sheet may be manufactured by the following process. First, the aerosol-generating material (for example, glycerin, propylene glycol, etc.), a fragrance, a binder (for example, guar gum, xanthan gum, Carboxymethyl cellulose (CMC), etc.), water by crushing tobacco raw materials, water After making the slurry mixed with the like, a sheet-like leaf sheet is formed using the slurry. When making a 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. Also, the leaflet sheet may contain other additives such as wood cellulose fiber.

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 on the leaflet sheet. Preferably, 5% to 30% of the aerosol-generating material may remain on the leaflet sheet.

In addition, before the process in which the cigarette rod 210 is packaged by the first wrapper 231, a flavoring solution such as menthol or moisturizer may be added by spraying it in the center of the cigarette 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 inside. The length of the first filter segment 221 may be an appropriate length within the range of 4mm to 30mm, 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 2mm to 4.5mm, but is not limited thereto.

The hardness of the first filter segment 221 may be adjusted by adjusting the content of the plasticizer at the time of manufacture of the first filter segment 221.

In addition, the first filter segment 221 may be manufactured by inserting a structure such as a film or tube 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 phenomenon that the internal material of the cigarette rod 210 is pushed back may be prevented, 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. Therefore, 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 suitably employed within the range of 7mm to 20mm. Preferably, the length of the cooling structure 222 may be about 18.5 mm, but is not limited thereto.

The cooling structure 222 can 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 materials. As the cooling structure 222 is formed by a crimped polymer sheet, the cooling structure 222 may include a plurality of channels extending in the longitudinal direction. Here, the channel means a passage through which a gas (eg, air or aerosol) passes.

For example, the cooling structure 222 can be formed from a material having a thickness between about 5 μm and about 500 μm, for example between about 10 μm and about 250 μm. In addition, the total surface area of the cooling structure 222 may be between about 300 mm ² / mm and about 1000mm ² / mm. Further, the aerosol cooling element can 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 menthol of 1.5 mg or more 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 suitably employed within a 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 produced by spraying a fragrance liquid to 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 in 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 a flavoring element is added to the second filter segment 223, an effect of enhancing the persistence of flavor delivered to the user may be generated.

As shown in FIG. 1, in the case of the cigarette 2 that generates an aerosol through heating of the heater 130, the temperature of the cigarette 2 significantly affects the degree to which the aerosol is produced. In order to deliver the optimal aerosol to the user, it is desirable to maintain the temperature of the cigarette 2 (specifically, the cigarette rod 210) within a predetermined range.

The heating of the cigarette 2 in the heated aerosol-generating device 1 is mainly achieved by conducting 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. Therefore, if a separate 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). Accordingly, heat generated from the heater 130 and heat applied to the cigarette are added, which may negatively affect the user's normal smoking.

The wrapper (at least one of the first wrapper 231 to the sixth wrapper 236 in FIG. 2) may employ an element that improves the heat conduction efficiency inside the cigarette 2. For example, a wrapper and aluminum foil may be laminated. However, this may be insufficient to reduce the loss of heat energy generated as heat is released to the outside of the cigarette 2.

Based on the tobacco rod 210 (that is, the medium), the heat conduction efficiency is promoted on the inside to maintain the temperature uniformly, and the heat inside does not escape to the outside, so as not to damage the user due to high temperature. There is a need. Therefore, the wrapper according to one embodiment is a conductive layer (that is, a layer that allows heat to be conducted inside the cigarette 2) and an insulating layer (that is, a layer that prevents heat from being discharged to the outside of the cigarette 2) is complex Is applied. 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 an insulating layer 310 and a conductive layer 320. The wrapper 300 illustrated in FIG. 3 may be any one of the first wrapper 231 to the sixth wrapper 236 of FIG. 2.

For example, the heat insulating layer 310 may be made of sol-gel, aerogel, or foam ceramic, and may be made by additionally coating a heat insulating material as necessary. However, the 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 discharged to the outside.

The insulating layer 310 may be made of a single material or a combination of several materials so that heat flow by conduction, convection, and radiation can be reduced. For example, the insulating layer 310 may be formed of a fiber, particulate, membrane, block or air layer, an open or closed cell, or a combination thereof. For example, as a material of the insulating layer 310, an organic insulating material such as expanded polystyrene, expanded polyurethane, extruded expanded polystyrene, polyethylene, or an inorganic insulating material such as a glass surface or a 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 fiber, and the thermal conductivity is 40-50 mW / mK, which can be changed depending on temperature, moisture content, and density. For example, in cellulose, the thermal conductivity may increase to 40 to 66 mW / mK as the water content increases to 0 to 5 vol%. In addition to this, wood, carbon steel, stainless steel, aluminum, ceramic, glass, ocher, airgel, and other phase change materials may be used as the material of the insulating layer 310. The 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 thermal conduction can be made.

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

Referring to (a) of FIG. 4, 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 heat conduction can be made.

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 particle 421 means a metal flake paste.

The metal particles 421 (ie, the metal flake paste) are uniformly distributed inside the pulp layer 422. For example, the metal particles 421 may be mixed and sprayed with pulp raw materials and metal particles 421 during the production process of the base paper, or may be impregnated and spray spray coated with the metal particles 421 during the production line. Accordingly, a wrapper excellent in thermal conductivity can be manufactured. Here, since the method of manufacturing the base paper is obvious to a person having ordinary knowledge in the art, detailed description is omitted. In order to ensure that the metal particles 421 are closely dispersed in the above-described mixing process, methods such as high-speed stirring and 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.

Below, the manufacturing process of the metal particle 421 (namely, a metal flake paste) is demonstrated.

In the manufacturing process of the metal flake paste, the metal flakes obtained in the first process and the first process of obtaining a metal flake by flaking a metal powder in an organic solvent containing an aromatic hydrocarbon are treated with an organic compound having a polar group, and pasted. And a second step.

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. For convenience of description, it will be described below that the metal flake paste is an aluminum flake paste. However, the manufacturing process of the aluminum flake paste, which will be described later, can be replaced with the manufacturing process of other metal flake pastes.

The first step is a step of flaking raw aluminum powder in an organic solvent containing an aromatic hydrocarbon as a main component to obtain aluminum flakes. Hereinafter, raw materials used in the first step, conditions of the first step, and the like will be described.

A pulverizing apparatus having a crushing medium is used for flaking the raw aluminum powder. Here, the term "flaking" means that the powder in the form of particles is molded into flakes (slices) using a grinding device or the like. The type of grinding device used in the present invention is not particularly limited, and a conventionally known grinding device can be suitably used. For example, an attritor-type grinding device having a rotating arm therein, or a cylindrical ball mill or the like can be preferably used. Among the above grinding devices, a cylindrical ball mill is particularly preferable because aluminum flakes with higher luminance can be obtained.

Moreover, in the manufacturing method of this invention, when using a ball mill, it is preferable to make the rotation speed of a ball mill 95% or less of a critical rotation speed. The critical rotational speed referred to 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 number of rotations is increased.

In the above equation (1), n is the number of revolutions (rpm), g is the acceleration of gravity (3528000 cm / min ² ), r is the ball mill radius (cm).

When the rotational speed of the ball mill exceeds 95% of the critical rotational speed, the crushing effect is stronger than the grinding effect, and sufficient flaking cannot be achieved, and on the contrary, large flake particles are divided and extremely fine particles are generated. It shows a tendency for the luminance of the coating film to be lowered. In addition, especially when using a steel ball grinding media having a diameter of 1 mm or less, when the rotational speed of the ball mill approaches the critical rotational speed, the impact force due to collision between the grinding media increases and the life of the grinding media is short. It tends to be difficult to use continuously. The reason is that a hardened coating film is generally not formed on the surface of the grinding media of steel balls having a diameter of 1 mm or less. The life of the grinding media can be increased by maintaining the rotation speed of the ball mill at 95% or less of the critical rotation speed.

The grinding time is not particularly limited, and may be appropriately determined depending on the diameter of the grinding media, the mass of the grinding media, the amount of grinding solvent, and the number of revolutions. Usually, it is 3 to 48 hours.

The grinding media is not particularly limited, and various materials such as steel balls, stainless steel balls, glass balls, and ceramic balls can be used, but from the viewpoint of specific gravity and economical efficiency, a sphere made of a material containing steel is provided. Iii) Media is preferred.

Moreover, although the grinding media to be used is preferably spherical, it does not necessarily need to be a true spherical grinding media, and may be substantially spherical grinding media. Further, the size of the grinding media may be appropriately selected depending on the aluminum flakes to be finally obtained, but, for example, the diameter is preferably in the range of 0.3 mm to 5.0 mm. Further, as the grinding media, two or more kinds of grinding media having different diameters may be mixed and used. Further, a grinding media having a diameter of more than 1.0 mm may be included in the grinding apparatus used in the present invention. The amount of the grinding media may be changed according to the amount of the raw material powder (for example, aluminum powder) input to the grinding apparatus, as described later.

For example, the raw material aluminum powder used as a raw material for the aluminum flake paste is not particularly limited, and the composition may be composed of only aluminum, may be composed of an aluminum base alloy, and the purity of aluminum is not particularly limited. In order to increase the gloss of the coating film and the printed material, it is generally preferable to use pure aluminum, and more preferably aluminum having a purity of 99.9 mass% or more.

In the first step, after the raw aluminum powder is flaked to obtain the aluminum flake, a solid-liquid separation operation such as a filtration operation or a screen operation may be performed to take out the aluminum flake. For example, after flaking (grinding), a slurry containing aluminum flakes in a ball mill is washed with mineral spirits, hung on a vibrating screen, and the passed slurry is solid-liquid separated by a fan filter, and aluminum flakes (however, as a filter cake ) Can be performed. Here, the "filter cake" refers to a semi-solid substance remaining after removing an organic solvent containing an aromatic hydrocarbon. In the filtration operation or screen operation, the grinding media may be removed from an organic solvent containing an aromatic hydrocarbon.

In addition, filtration operation or screen operation is not limited to the first step, and can be appropriately performed in each step described later.

In the first step, after the raw aluminum powder is flaked to obtain an aluminum flake, the organic solvent containing an aromatic hydrocarbon as the main component may be changed 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 a solvent having a lower solubility in the "organic compound having a polar group" described 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, even if it is attached to the surface of the aluminum flake or contained in the solvent, has the effect of improving the storage stability of the aluminum flake paste in any case, but is attached to the surface of the aluminum flake. It is more preferable to improve storage stability. Therefore, by changing the solvent, dissolution of the organic compound having a polar group in the solvent can be suppressed, and 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 pasting. Here, "treating with the organic compound which has a polar group" is a process aiming at attaching the organic compound which has a polar group to the surface of an aluminum flake. Moreover, when the 2nd process is performed in the state which added the pasting solvent to the aluminum flake, the organic compound which has this polar group may be contained in the pasting solvent while being attached to the surface of an aluminum flake. Hereinafter, raw materials and conditions used in the second step will be described.

In the second step, an operation of treating the aluminum flakes obtained in the first step with an organic compound having a polar group is performed.

When an organic solvent containing an aromatic hydrocarbon as a main component is used as a grinding solvent, the solubility in fatty acids such as oleic acid and stearic acid is higher than when using an aliphatic hydrocarbon (typically mineral spirit) as a grinding solvent. . Fatty acids such as oleic acid and stearic acid are added as a grinding aid during flaking (grinding), and adhere to the aluminum flake surface after flaking to impart parallel alignment of aluminum flakes, suppress aggregation, and protect the aluminum flake surface. Complete the roles of the back. However, when the solubility in the grinding solvent increases, the amount of fatty acids attached to the surface of the aluminum flake decreases as a result. For this reason, aggregation or the like occurs over time, and storage stability of the aluminum flake paste is lowered. However, in the manufacturing method of the present invention, the storage stability of the aluminum flake paste can be improved by treating the aluminum flakes obtained in the first step with an organic compound having a polar group.

That is, the manufacturing method of the present invention exhibits an excellent effect that an aluminum flake paste with good storage stability can be obtained. It is because generation | occurrence | production of the aggregation of the aluminum flake in an aluminum flake paste is suppressed by treating with the organic compound which has a polar group.

As described above, the organic compound having a polar group has an effect of improving storage stability even if it is attached to the surface of the aluminum flake or contained in the pasting solvent. However, in order to improve storage stability, it is more preferable that the organic compound having a polar group is 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 hydroxyl group, carboxyl group, amino group, amide group (amide bond), 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, aliphatic amines, fatty acid amides, fatty alcohols, and esters composed 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.

For example, fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, oleic acid, stearic acid, linoleic acid, arachidonic acid, behenic acid, and the like. Moreover, as an aliphatic amine, lauryl amine, myri iron amine, palmityl amine, stearyl amine etc. are mentioned, for example. Moreover, as fatty acid amide, lauric acid amide, palmitic acid amide, oleic acid amide, stearic acid amide, behenic acid amide etc. are mentioned, for example. In addition, examples of the aliphatic alcohol include capryl alcohol, lauryl alcohol, myristeel alcohol, oleyl alcohol, stearyl alcohol, behenyl alcohol, and the like. Moreover, as an ester which consists of a fatty acid and an aliphatic alcohol, for example, methyl laurate, methyl oleate, methyl stearate, octyl stearate, isopropyl myristate, butyl stearate, octyl palmitate, octyl oleate, and arm And isopropyl mitate.

In the second step, "pasting" means increasing the viscosity of the slurry containing the aluminum flakes in the first step (when aluminum flakes are obtained as a filter cake, making them highly viscous fluids) ). This operation is usually performed by adding a pasting solvent, but when the viscosity of the mixing system when processing by adding an organic compound having a polar group to the aluminum flake is high, the solvent constituting the mixing system is used as a pasting solvent. Considering this, it is not necessary to add a separate pasting solvent. When the viscosity of the mixing system when processing by adding an organic compound having a polar group to the aluminum flake is low, the mixing system is obtained by adding a pasting solvent to the mixing system or substituting the solvent constituting the mixing system with the pasting solvent. It is also possible to increase the viscosity of.

Here, the term "pasting solvent" refers to a compound mixed with aluminum flakes in order to 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 the pasting solvent, as described above. Another solvent may be used as a pasting solvent by adding the same solvent or replacing the solvent. The material of the pasting solvent is not particularly limited, and an aliphatic hydrocarbon (eg, mineral spirit), an organic solvent containing an aromatic hydrocarbon as a main component, and a glycol ether solvent or the like can be used. Further, the content of the pasting solvent in the aluminum flake paste is not particularly limited, but if it is in the range of 15% by mass or more and 50% by mass or less, storage stability can be further improved, and the aluminum flake in the coating during coating is further improved. It is preferable from the point of being able to improve the dispersibility of. It is more preferable in 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 organic compounds having a grinding aid or a polar group attached to the surface of an aluminum flake or having a polar group, those having an unsaturated double bond in their structure may undergo radical reaction to denature or polymerize (deterioration) Have By this deterioration, the aluminum flakes may aggregate or adversely affect the parallel arrangement of the aluminum flakes, and the luminance may decrease.

By adding an antioxidant, these deterioration can be stopped or suppressed. At what stage of the manufacturing process, the operation of adding the antioxidant can be appropriately determined depending on the type of the organic compound having a grinding aid and a polar group added to the aluminum flake. Specifically, when an unsaturated fatty acid or the like, which has an unsaturated double bond in its structure and is prone to radical reaction, is used as a grinding aid, an antioxidant may be added during flaking in the first step. In addition, when an organic compound having a polar group in the second step is used that has an unsaturated double bond in the structure and is likely to cause a radical reaction, an antioxidant may be added during the second step or after the second step.

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

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

The composition of the aluminum flake is the same as that of the raw material aluminum powder in the method for producing the aluminum flake paste described above. That is, the composition of the aluminum flake is not particularly limited, but may be composed of only aluminum or may be composed of an aluminum base alloy. The purity of the aluminum is not particularly limited, but in order to further enhance the gloss of the coating film and the printed material containing the aluminum flake paste, it is usually pure aluminum, and more preferably pure aluminum having a purity of 99.9 mass% or more.

The content of the aluminum flake in the aluminum flake paste is not particularly limited, but if it is 50 mass% or more and 85 mass% or less with respect to the aluminum flake paste, storage stability can be improved. It is preferable because the effect of improving the dispersibility of the flakes can be obtained. Moreover, it is more preferable in it being 60 mass% or more and 75 mass% or less.

The aluminum flake of this invention contains the aluminum flake whose surface area is 250 micrometers or more.

In the aluminum flake paste of the present invention, another additive may be included as long as the effect of the present invention is not impaired. Such an additive may be attached to the surface of the aluminum flake, or may be contained in the aluminum flake paste.

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

Referring to (c) of FIG. 4, 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 of the wrapper 400 and the conductive layer 420. Here, the winding paper 430 may be a porous winding paper or a non-porous winding paper. In addition, the winding paper 430 may be a hard winding paper. The above-mentioned porous winding paper, non-porous winding paper and hard winding paper are as described above with reference to FIG. 2.

Those of ordinary skill in the art related to the present embodiment will understand that it may be implemented in a modified form without departing from the essential characteristics of the above-described substrate. Therefore, the disclosed methods should be considered in terms of explanation, not limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent range should be interpreted as being included in the present invention.

1: holder
110: battery
120: control unit
2: cigarette
210: first part
220: part 2

Claims (7)

As a wrapper for packaging at least a portion of the cigarette,
An insulating layer that prevents heat from being released to the outside of the cigarette; And
A wrapper comprising; a conductive layer that allows the heat to be conducted inside the cigarette. According to claim 1,
The conductive layer,
Pulp layer; And
Metal layer; includes,
The metal layer is a wrapper made of at least one of aluminum, steel, iron, copper, or a metal alloy. According to claim 1,
The conductive layer,
Pulp layer; And
Includes; metal particles uniformly distributed in the interior of the pulp layer,
The metal particles are wrappers comprising a metal flake paste. The method of claim 3,
The metal flake paste,
A first step of flaking raw aluminum powder in an organic solvent containing an aromatic hydrocarbon as a main component to obtain aluminum flakes; And
A wrapper produced by a method comprising; a second step of treating and pasting the aluminum flake obtained in the first step with an organic compound having a polar group. The method of claim 4,
The organic compound having the polar group is at least one wrapper selected from the group consisting of fatty acids, aliphatic amines, fatty acid amides, fatty alcohols, and esters composed of fatty acids and fatty alcohols. According to claim 1,
Further comprising; a winding paper located 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
And a wrapper packaging at least one of the tobacco rod and the at least one filter segment.
The wrapper,
An insulating layer preventing heat from being discharged to at least one of the tobacco rod and the filter segment; And
A cigarette comprising; a conductive layer that allows the heat to be conducted inside at least one of the tobacco rod and the filter segment.

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