KR101983366B1 - Electric heating type smoking device using PWM control - Google Patents

Abstract

[0001] The present invention relates to an electric heating type smoking apparatus, and is intended to rapidly heat a solid type cigarette through pulse width modulation (PWM) control for a high calorific power generated in a heater at low power. The present invention relates to a cigarette comprising a heater having a plurality of planar heating elements based on nano carbon particles having a tube shape in which a one end of a solid cigarette is inserted and generating heat upon receipt of power, a temperature sensor attached to the heater, The present invention provides an electric heating type smoking apparatus using a PWM control method including a controller for controlling a heater on / off in a PWM manner based on a temperature received from a temperature sensor.

Description

[0001] The present invention relates to an electric heating type smoking device using a PWM control method,

The present invention relates to a solid-state electronic cigarette, and more particularly, to a solid-state electronic cigarette having an electric-heated smoking cigarette using a PWM control method for rapidly heating a solid cigarette through PWM (pulse width modulation) control for high calorific power generated by a heater at low power ≪ / RTI >

Generally, small-sized cigarettes are a type in which smoke is sucked by combustion through ignition of a lighter or a match. Such soft tobacco will inhale a large amount of toxic substances such as tar and heavy metals.

In recent years, a solid electronic cigarette has been introduced, which is a type of cigarette (hereinafter referred to as " solid cigarette ") by electric heating in order to solve such a problem. Tobacco which can reduce the inhalation of harmful substances and smokes through steam without smoke at the same time.

To enjoy such a solid electronic cigarette, an electric-heated smoking device is required, which is a dedicated electronic device. An electric-heated smoking device includes a heater necessary for pumping a solid cigarette.

As the heater of the conventional electric heating smoking device, a heating blade or a metal etching film heater is used. However, there is a problem that it takes a lot of time and power to heat the metal structure of the heating blade or the metal etching film heater to the temperature required to bake the solid cigarette. Since the electric power consumption of the heater is large, there is a problem that the conventional electric heating type smoking device can not continuously smoke more than two solid cigarettes.

Korean Registered Patent No. 10-1655716 (Registered on September 1, 2016)

Accordingly, an object of the present invention is to provide an electric heating type smoking device using a PWM control method that rapidly heats a solid cigarette with a high calorific power generated by low power.

Another object of the present invention is to provide an electric heating type smoking device using a PWM control method that can effectively control the process of transferring heat generated from a heater to a solid type cigarette, thereby reducing the time required for pumping a solid type cigarette.

In order to achieve the above object, the present invention provides a metal thin plate of a tube shape; An insulating layer covering one surface of the thin metal plate; An electrode wiring pattern formed on the insulating layer; A plurality of electrode wiring patterns formed by printing a heating element composition based on nano carbon particles on the insulating layer so as to be connected to the electrode wiring patterns, Plane heating elements; And a cover layer covering the insulating layer on which the plurality of planar heating elements are formed. At this time, when a drive voltage of DC 2V and DC 3.7V is applied to the electrode wiring pattern, the power ratio is 3.4 to 4.8.

When a driving voltage of DC 3.7 V is applied to the electrode wiring pattern, the thermal density is 2 W / cm 2 or more.

The heater for an electric heating smoking apparatus according to the present invention may further include a heat insulating layer covering the cover layer.

The material of the heat insulating layer may include a silicon tube having an air layer therein, porous silicon, PFA (Perfluoroalkoxy), or aramid fiber.

The insulating layer may be formed on one side of the thin metal plate by coating or casting.

Wherein the plurality of planar heating elements comprise conductive particles comprising carbon nanotube particles and graphite particles; And a mixed binder containing hexamethylene diisocyanate, polyvinyl acetal, and phenolic resin or containing epoxy acrylate, polyvinyl acetal, and phenolic resin.

The plurality of planar heating elements may include bent portions.

The present invention also relates to a heater comprising: a plurality of planar heating elements based on nanocarbon particles having a tube shape in which one end of a solid type cigarette is inserted; A temperature sensor attached to the heater to measure and deliver the temperature; And controlling the on / off of the heater by a pulse width modulation (PWM) method on the basis of the temperature received from the temperature sensor. The peak temperature of the heater is initially peaked to 350 to 400 ° C, And a controller for performing PWM control so as to maintain the temperature at 250 to 350 DEG C. The present invention provides an electric heating smoking device using a PWM control method.

When the driving voltage of DC 3.7V is applied to the electrode wiring pattern, the controller performs the PWM control so that the temperature of the heater is peak-heated to 350 to 400 ° C within 3 seconds and then maintained at 250 to 350 ° C.

And the heater further comprises a heat insulating layer covering the cover layer, wherein the temperature sensor is formed on the cover layer and covered by the heat insulating layer.

According to the present invention, it is possible to rapidly heat a solid cigarette inserted in a heater through PWM control for a high calorific power generated at low power in a tubular heater based on nanocarbon particles.

That is, the heater according to the present invention exhibits a thermal density of 2 W / cm 2 or more per unit area while instantaneously generating a high calorific value of 500 ° C or more even at a low voltage of 3 to 4V. Accordingly, peak heating is performed at 350 to 400 ° C for a few seconds in the initial period using a rapid heating rate of the heater, and then PWM control is performed so as to maintain the temperature at 250 to 350 ° C to quickly heat the solid cigarette inserted in the heater have. Further, it is possible to suppress the deterioration of the durability and lifespan of the heater due to the high heating value of the heater through the PWM control.

The heater according to the present invention can eliminate the use of the adhesive used between the existing metal foil (metal structure) and the insulating layer because the insulating layer is formed directly on the thin metal foil by coating or casting. As a result, the problems caused by the use of the conventional adhesive can be solved. Especially, even if the heater is initially heated to a high temperature through the PWM control, a stable bonding state between the thin metal plate and the insulating layer can be maintained.

Conventionally, in order to manufacture a metal structure by directly forming a metal structure in a tube shape, a thickness of about 1.5 mm is required, which increases the heat capacity of the metal structure and consumes time and power for heating the metal structure. There may be a problem that the convenience is poor. However, the present invention can reduce the heat capacity of the metal foil, shorten the heating time of the solid cigarette, reduce the power consumption .

Since the heater according to the present invention is implemented in the form of a tube so that a solid cigarette can be inserted, it is not necessary to separately fabricate a structure for mounting the solid cigarette.

Since the heater according to the present invention includes the electrode wiring pattern and the planar heating element that can be driven at a low voltage, high heating performance can be exhibited with low power. Since the planar heating element is formed of a heating element composition in the form of a paint containing nano carbon particles and a mixed binder, it has advantages of low specific resistance and excellent thermal conductivity, which is advantageous for low voltage driving and has a high heating rate. Therefore, the heater according to the present invention can quickly heat the solid cigarette.

Since the heater according to the present invention includes the planar heating element formed to have a curvature, the contact area between the planar heating element and the thin metal plate can be increased in the form of a tube. Accordingly, the heater according to the present invention can reduce power consumption, heat transfer loss, and manufacturing cost, and can minimize the heat capacity of the metal thin plate.

By forming the heat insulating layer on the outer surface of the heater according to the present invention, the heat generated in the surface heat generating element can be prevented from being released to the outside and lost. In addition, the heat insulating layer can transfer heat to the side where the solid cigarette is inserted, thereby shortening the time for heating the solid cigarette and further reducing the amount of electric power used.

1 is a schematic view showing a solid electronic cigarette according to the present invention.
2 is a perspective view showing a heater for an electric heating smoking apparatus according to a first embodiment of the present invention.
3 is an enlarged view of a portion " A " in Fig.
4 is an enlarged view of a portion " B " in Fig.
5 to 16 are views showing steps of a method of manufacturing a heater according to a first embodiment of the present invention,
5 is a plan view showing a metal thin plate,
FIG. 6 is a sectional view taken along the line 6-6 in FIG. 5,
7 is a cross-sectional view showing a step of forming an insulating layer on the upper surface of the metal thin plate,
8 is a cross-sectional view showing a step of forming a metal layer on an insulating layer,
9 is a plan view showing a step of forming an electrode wiring pattern by patterning a metal layer,
10 is a plan view showing a step of printing a heating element composition to form a plurality of planar heating elements,
11 is a sectional view taken along the line 11-11 in Fig. 10,
12 is a plan view showing a step of forming a cover layer on an insulating layer so as to cover an electrode wiring pattern and a plurality of planar heating elements,
13 is a sectional view taken along line 13 - 13 of FIG. 12,
FIG. 14 is a plan view showing a step of cutting a portion excluding the bonding portion and the electrode wiring pattern to produce a film heater on a plate, FIG.
Fig. 15 is a sectional view taken along the line 15-15 in Fig. 14,
16 is a cross-sectional view showing a step of heating the film heater in the shape of a tube so that the thin metal plate faces the inner surface.
17 is a plan view showing a unit film heater formed on a metal thin plate strip.
18 is a perspective view showing a heater according to a second embodiment of the present invention.
19 is an enlarged view of a portion " C " in Fig.
20 is a sectional view showing a heater according to a third embodiment of the present invention.
21 is a plan view showing a film heater of a heater according to a fourth embodiment of the present invention.
22 is a photograph showing the film heaters according to the fourth embodiment formed on the metal thin plate strip before the punching.
Fig. 23 is a photograph showing the lower surface of the film heater of Sample No. 5 after punching of Fig. 22;
24 is a photograph showing the upper surface of the film heater of sample 5 in Fig.
25 is a graph showing the exothermic behavior when DC 2 V is applied to the heater of sample 5.
26 is a schematic diagram of PWM control of the heater of the sample No. 5.

In the following description, only parts necessary for understanding embodiments of the present invention will be described, and descriptions of other parts will be omitted to the extent that they do not disturb the gist of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor is not limited to the meaning of the terms in order to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

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

1 is a schematic view showing a solid electronic cigarette according to the present invention.

Referring to FIG. 1, a solid type electronic cigarette 100 according to the present invention includes a solid cigarette 95 and an electric heating type smoking device 90. The solid electronic cigarette 100 is an electronic cigarette which is inserted into an electric heating type smoking device 90 and heated by electric power, unlike a liquid type electronic cigarette using conventional liquid nicotine.

The solid cigarette 95 has a shape similar to a general soft cigarette. That is, the solid cigarette 95 includes a tobacco portion 95b for receiving the tobacco, a filter portion 95b for filtering harmful substances contained in the aerosol generated by steaming the tobacco portion 95b, (95a). At this time, the tobacco of the tobacco part (95b) is distinguishable from the normal tobacco tobacco, which is heatable.

The electric heating smoking apparatus 90 according to the present invention includes a heater 80 that heats the solid cigarette 95 by electric heating and may further include a temperature sensor 91 and a control unit 93.

One of the openings 81 and 83 has an insertion port 81 into which one end of the solid cigarette 95 is inserted, Is used. The other side of the openings 81 and 89, that is, the opposite side of the insertion port 81, sucks the aerosol generated by the heating of the solid cigarette 95 through the filter portion 95a of the solid cigarette 95 It is used as an inlet 83 into which air flows.

This heater 80 is manufactured by rolling a plate-like film heater having a thin metal plate as a base layer. The heater 80 has a structure in which a plurality of planar heating elements based on nanocarbon particles are formed by receiving power from one side of a thin metal plate.

The temperature sensor 91 is attached to the heater 80, measures the temperature, and transmits the measured temperature to the control unit 93. As the temperature sensor 91, a resistance temperature detector (RTD) type temperature sensor may be used, but the present invention is not limited thereto.

The controller 93 controls the on / off state of the heater 80 based on the temperature received from the temperature sensor 91. That is, the control unit 93 controls the on / off of the heater 80 on the basis of the temperature received from the temperature sensor 91 so that the cigarette 95 inserted in the insertion hole can transmit the heat of the proper temperature. The control unit 93 turns off the heater 80 when it is separated from the solid cigarette 95 at the insertion port.

At this time, the controller 91 can control the ON / OFF of the heater 80 by a pulse width modulation (PWM) method. Here, the PWM method is one of the pulse modulation methods, and refers to a method in which the duty ratio of pulses is controlled in accordance with the magnitude of the modulation signal. That is, the PWM control adjusts the control value by adjusting the duty ratio, and the duty ratio of the pulse signal changes, so that the average value of the pulse signal changes and the average value is used as the control signal value.

The control unit 91 controls the heater 80 to turn on and off so as to maintain a proper temperature at which the solid cigarette 95 can be heated in a temperature range that can be generated by the heater 80, . That is, the control unit 91 performs peak-heating at 350 to 400 ° C for a few seconds in the initial period using the rapid heating rate of the heater 80, and then performs PWM control to maintain the temperature at 250 to 350 ° C. Thus, the solid cigarette 95 inserted into the heater 80 can be rapidly heated. The heater 80 can be stably driven by suppressing the durability and the service life of the heater 80 due to the high heating value of the heater 80 through the PWM control.

Although not shown, the electric heating smoking apparatus 90 according to the present invention includes a power supply unit for supplying electric power to the heater 80. The power supply unit may be a primary battery or a secondary battery.

The heaters 80, 180, and 280 used in the electric heating smoking device 90 according to the present invention will now be described with reference to FIGS. 2 to 21. FIG.

[First Embodiment]

2 is a perspective view showing a heater for an electric heating smoking apparatus according to a first embodiment of the present invention. 3 is an enlarged view of a portion " A " in Fig. And Fig. 4 is an enlarged view of a portion "B" in Fig.

2 to 4, the heater 80 according to the first embodiment has a tube shape in which openings 81 and 83 for inserting one end of a solid cigarette are formed, and the metal thin plate 10, An electrode wiring pattern 30, a plurality of planar heating elements 40, and a cover layer 50. The planar heating elements 40, Here, the thin metal plate 10 has a tube shape. The insulating layer (20) covers one side of the thin metal plate (10). The electrode wiring pattern 30 is formed on the insulating layer 20. The plurality of planar heating elements 40 are formed by printing a heating element composition based on nano carbon particles on the insulating layer 20 so as to be connected to the electrode wiring patterns 30 and receive power from the electrode wiring patterns 30 to generate heat. The cover layer 50 covers the insulating layer 20 on which a plurality of surface heat emission elements 40 are formed.

The heater 80 according to the first embodiment has a structure in which the thin metal plate 10 is located on the inner side and the lid layer 50 is located on the outer side. That is, the heater 80 according to the first embodiment has the structure in which the insulating layer 20, the electrode wiring pattern 30, the plurality of surface heating elements 40, and the cover layer 50 are sequentially formed on the outer surface of the thin metal plate 10 And has a laminated structure.

The thin metal sheet 10 is a base layer capable of forming an insulating layer 20, an electrode wiring pattern 30, a plurality of surface heating elements 40 and a cover layer 50. The metal foil 10 has a lower surface 11 and an upper surface 13 opposite the lower surface 11. As the material of the thin metal plate 10, aluminum, copper, nickel, stainless steel, brass or an alloy thereof may be used. At this time, the brass is a copper alloy containing copper and zinc, and may further contain a small amount of As, P, Al, and Si. As the brass, brass having a zinc content of 50% by weight or less can be used.

The insulating layer 20 is formed on the upper surface 13 of the thin metal plate 10 by coating or casting. As the material of the insulating layer 20, a plastic material can be used. For example, the insulating layer 20 may be formed of a material such as polyimide, polyethersulphone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethyelenene naphthalate PEN, polyethyeleneterephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polycarbonate (PC), cellulose triacetate (CTA), or cellulose acetate propionate Cellulose acetate propinonate (CAP) may be used and is not limited to those listed.

As the material of the insulating layer 20, an insulating ink composition may be used. For example, the insulating ink composition includes a mixed binder, an inorganic nanoparticle, a dispersant, and an organic solvent. The insulating ink composition may further include an inorganic filler and a leveling agent.

The insulating ink composition can be implemented in the form of a coating or a solution by controlling the amount of the organic solvent used.

The insulating ink composition includes 8 to 10 parts by weight of a mixed binder, 0.001 to 0.5 parts by weight of inorganic nanoparticles, 20 to 80 parts by weight of an organic solvent, and 0.5 to 5 parts by weight of a dispersant, based on 100 parts by weight of the insulating ink composition.

The mixed binder, dispersant, organic solvent, and leveling agent may be the same materials as the mixed binder, dispersant, organic solvent, and leveling agent included in the heating element composition described later.

The inorganic nanoparticles include graphene oxide (GO) particles, partially reduced graphene oxide particles, or conductive carbon particles of nanometer-sized diameter. The inorganic nanoparticles enhance the heat resistance and insulation of the insulating ink composition.

The inorganic nanoparticles include 0.001 to 0.5 parts by weight based on 100 parts by weight of the insulating ink composition. As a result, the conductive carbon particles can be distributed in island form between the matrix formed by the mixed binder.

Graphene oxide particles are insulated within 120 layers and are partially graphitized particles.

Graphene oxide particles have various functional groups. Using these various functional groups, graphene oxide particles can induce direct chemical covalent bonding with the organic binder binder. Thus, the insulating ink composition has stable heat resistance even at a temperature of around 300 캜.

The graphene oxide particles have functional groups with excellent chemical reactivity such as carboxyl, amine, imine, hydroxyl, carbonyl, and lactone on the surface and edge. The functional groups contained in graphene oxide particles can be chemically covalently bonded to functional groups contained in diisocyanate, phenol, and epoxy. Thus, graphene oxide particles form chemical covalent bonds with the epoxy acrylate, hexamethylene diisocyanate and phenolic resin contained in the mixed binder. The chemical covalent bond between the graphene oxide particles and the binder binder forms a three-dimensional network and inhibits the movement of the polymer chains, which can lead to an increase in the glass transition temperature and the decomposition initiation temperature.

Since the graphene oxide particles have a large number of functional groups on the surface and the edge portion as described above, they exhibit good dispersibility in the mixed binder and the organic solvent.

The conductive carbon particles may include carbon black or 20 or less layers of graphite particles. The graphite particles may have a diameter of less than 2 탆. If the diameter of the graphite particles exceeds 2 mu m, the impulse breaking strength may be lowered.

On the other hand, the conductive carbon particles, such as carbon nanotubes and carbon fibers, are not preferable. The reason is that acicular carbon nanotubes or carbon fibers are not suitable as a component of the insulating ink composition for forming the insulating layer 20 because they can form an electric network with a small content.

The inorganic filler may be added for the purpose of improving reliability such as surface strength and moisture absorption properties of the insulating layer 20 formed using an insulating ink composition. The inorganic filler may include 10 to 70 parts by weight based on 100 parts by weight of the insulating ink composition. As the inorganic filler, fused silica particles or alumina particles having a particle size of 50 nm to 2 占 퐉 may be used. In order to increase the packing ratio, the fused silica particles may use particles having two or more particle sizes.

Since the insulating layer 20 is formed on the thin metal plate 10 by coating or casting, it is not necessary to use a separate adhesive to form the insulating layer 20 on the thin metal plate 10. [

The insulating layer 20 is formed on both sides of both ends of the thin metal plate 10. Both ends of the thin metal plate 10 exposed out of the insulating layer 20 are used as the bonding portions 17. [ The joining portion 17 is a portion to be joined when the both ends are rolled by rolling a film heater made in a plate shape.

The electrode wiring pattern 30 is formed on the insulating layer 20 and supplies a power source externally applied to the surface heating element 40. The electrode wiring pattern 30 may be formed of a metal material so as to minimize a voltage drop. As the metal material forming the electrode wiring pattern 30, silver, aluminum, copper, nickel, stainless steel, brass or an alloy thereof can be used.

The electrode wiring pattern 30 can be formed by an etching method using a metal foil or a printing method using a metal paste. That is, the electrode wiring pattern 30 can be formed by laminating a metal foil on the insulating layer 20 and then patterning it by an etching method. Or the electrode wiring pattern 30 may be formed by printing a metal paste on the insulating layer 20.

The planar heating element 40 is formed to be connected to the electrode wiring pattern 30. The area heating element 40 can be formed by printing so as to connect the heating element composition to the electrode wiring pattern 30, followed by thermosetting and aging. As the printing method of the exothermic composition, screen printing, gravure printing (to roll to roll gravure printing), comma coating (to roll to roll comma coating), flexo, imprinting, offset printing and the like can be used. Thermal curing may be performed at 100 ° C to 180 ° C, and aging may be performed at 250 ° C to 350 ° C. The reason why the surface heat emission element 40 is formed by aging after thermosetting is to ensure the high temperature stability of the surface heat emission element 40.

The planar heating elements 40 are formed to be arranged in the horizontal direction on the insulating layer 20. That is, the area heating element 40 may be formed on the insulating layer 20 in an n row m column (n, m is a natural number of 2 or more). At this time, the electrode wiring pattern 30 is formed to connect the plurality of surface heat emission elements 40 formed on the insulating layer 20 in parallel.

The heating element composition for forming the planar heating element 40 includes a mixed binder and conductive particles based on nano carbon particles. In order to form the surface heating element 40, the heating element composition to be fed into the printing step further includes an organic solvent and a dispersing agent in addition to the mixed binder and the conductive particles.

The heating element composition may include 5 to 30 parts by weight of the mixed binder, 0.7 to 60 parts by weight of the conductive particles, 29 to 80 parts by weight of the organic solvent, and 0.5 to 5 parts by weight of the dispersing agent, based on 100 parts by weight of the heating element composition.

The conductive particles include nano-sized carbon particles having conductivity, and may further include a metal powder. As the carbon particles, carbon nanotube particles or graphite particles can be used. As the metal powder, powders of silver, copper or nickel may be used. For example, the conductive particles may include 0.1 to 5 parts by weight of carbon nanotube particles, 0.1 to 20 parts by weight of graphite particles or 10 to 60 parts by weight of metal powder with respect to 100 parts by weight of the exothermic composition.

The carbon nanotube particles can be selected from single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes, or mixtures thereof. For example, the carbon nanotube particles may be multi wall carbon nanotubes. When the carbon nanotube particles are multi-walled carbon nanotubes, the diameter may be 1 nm to 20 nm, and the length may be 1 to 100 mu m.

The graphite particles may have a diameter of 1 탆 to 25 탆 and a thickness of 1 nm to 25 탆.

The metal powders include powders of silver, copper or nickel. In the case of silver powder, it may have the form of a flake, a sphere, a polygonal plate, a rod, or the like. As the copper powder, silver coated Cu powder and nickel coated Cu powder can be used. As the nickel powder, silver coated Ni powder may be used.

When the planar heating element 40 is formed of the heating element composition including the carbon particles and the metal powder, the metal powder forms the main electrical network, and the space between the metal powders is filled with carbon particles to form a three-dimensional random network structure.

As described above, the heating element composition includes the carbon particles and the metal powder, so that the energy efficiency and heat generation rate of the surface heating element 40 can be increased. That is, the metal powder has no blackbody radiation function. However, by including carbon particles in the heating element composition, the black body radiation function can be realized. The heat resistance of the planar heating element 40 can be increased due to the carbon particles. Due to the carbon particles, the heat generation rate and energy efficiency of the surface heating element 40 can be increased.

The specific resistance of the area heating element 40 can be determined by the content of carbon particles or metal powder in the total solid content. For example, it is possible to control the resistivity by only carbon particles up to the area of 1 × 10 ^-2 Ω cm, but further introduction of the metal powder is required in the area below the area. A planar heating element 40 may have a specific resistance of 9 × 10 ^-2 to 1.1 × 10 ^-3 Ω㎝.

The mixed binder includes at least two of a phenol resin, an acetal resin, an isocyanate resin and an epoxy resin so as to have heat resistance even at a temperature of about 300 ° C. For example, the mixed binder includes at least two of epoxy, epoxy acrylate, hexamethylene diisocyanate, polyvinyl acetal, and phenolic resin.

For example, the mixed binder may include hexamethylene diisocyanate, polyvinyl acetal, and phenolic resin or may include epoxy acrylate, polyvinyl acetal, and phenolic resin. Wherein the mixed binder may include 10 to 150 parts by weight of a polyvinyl acetal resin and 100 to 500 parts by weight of a phenolic resin based on 100 parts by weight of epoxy acrylate or hexamethylene diisocyanate. When the phenolic resin is 100 parts by weight or less based on 100 parts by weight of the epoxy acrylate or hexamethylene diisocyanate, the heat resistance is lowered. When the amount is more than 500 parts by weight, the flexibility of the surface heat emission element 40 is lowered and the brittleness may be increased.

By increasing the heat resistance of the mixed binder in this way, even when the area heating element 40 is heated to a high temperature of 300 deg. C or less, the resistance change or breakage of the area heating element 40 can be suppressed.

Here, the phenolic resin means a phenolic compound including phenol and phenol derivatives. For example, phenol derivatives include p-cresol, o-Guaiacol, Creosol, Catechol, 3-methoxy-1,2-benzenediol (3- methoxy-1,2-benzenediol, Homocatechol, Vinylguaiacol, Syringol, Iso-eugenol, Methoxyeugenol, o- Cresol, 3-methyl-1,2-benzenediol and (z) -2-methoxy-4- (1-propenyl) -phenol 2-methoxy-4- (1-propenyl) -phenol, 2,6-dimethoxy-4- (2-propenyl) Phenol, 3,4-dimethoxy-Phenol, 4-ethyl-1,3-benzenediol, Resole phenol, 4-methyl-1,2-benzenediol, 1,2,4-benzene triol, 2-methoxy-6-methylphenol 2-Methoxy-6-methylphenol, 2-Methoxy-4-vinylphenol or 4-ethyl-2-methoxy- , Etc. It is not.

The organic solvent is used for dispersing the conductive particles and the binder. The organic solvent is selected from the group consisting of Carbitol acetate, Butyl carbotol acetate, DBE (dibasic ester), Ethyl Carbitol, Ethyl Carbitol Acetate, Dipropylene Glycol Methyl ether, cellosolve acetate, butyl cellosolve acetate, butanol, and octanol.

Meanwhile, various methods commonly used may be applied to the dispersion process. For example, ultrasonic treatment (roll-milling), bead milling or ball milling Lt; / RTI >

Dispersing agents are used for smoother dispersion of conductive particles. Common dispersants used in the art such as BYK, amphoteric surfactants such as Triton X-100, and ionic surfactants such as SDS can be used.

The heating element composition may further comprise 0.1 to 5 parts by weight of a silane coupling agent as an additive to 100 parts by weight of the heating element composition.

The silane coupling agent functions as an adhesion promoter for enhancing the adhesion force between the resins when the heating element composition is compounded. The silane coupling agent may be an epoxy-containing silane or a mercaptan-containing silane. Examples of such silane coupling agents include epoxy-containing 2- (3,4-epoxycyclohexyl) -ethyltrimethoxysilane, 3-glycidoxytrimethoxysilane, 3-glycidoxypropyltriethoxysilane, (Aminoethyl) 3-aminopropylmethyldimethoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane having an amine group and N-2 , N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl- Propylamine, N-phenyl-3-aminopropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltriethoxysilane, isocyanate, 3-isocyanate propyltriethoxysilane, and the like, but is not limited thereto.

The heating element composition may further comprise 0.5 to 20 parts by weight of ceramic particles as an additive to 100 parts by weight of the heating element composition. The ceramic particles increase the heat capacity of the surface heating element 40. As such ceramic particles, glass particles or silicon particles can be used.

Further, the heating element composition may further comprise 0.0001 to 1 part by weight of graphene oxide particles as an additive to 100 parts by weight of the heating element composition. Herein graphene oxide particles have an insulating property within 1 to 20 layers, and partially graphitized particles are used.

Graphene oxide particles have various functional groups. Using these various functional groups, graphene oxide particles can induce direct chemical covalent bonding with the organic binder binder. Accordingly, the exothermic composition according to the present invention has stable heat resistance even at a temperature of around 300 ° C.

That is, graphene oxide particles have functional groups with excellent chemical reactivity such as carboxyl, amine, imine, hydroxyl, carbonyl, and lactone on the surface and edge. The functional groups contained in graphene oxide particles can be chemically covalently bonded to functional groups contained in diisocyanate, phenol, and epoxy. Thus, graphene oxide particles form chemical covalent bonds with the epoxy acrylate, hexamethylene diisocyanate and phenolic resin contained in the mixed binder. The chemical covalent bond between the graphene oxide particles and the binder binder forms a three-dimensional three-dimensional network and inhibits the movement of the polymer chain, which can lead to an increase in the glass transition temperature and the decomposition initiation temperature.

Since the graphene oxide particles have a large number of functional groups on the surface and the edge portion as described above, they exhibit good dispersibility in the mixed binder and the organic solvent.

On the other hand, in the first embodiment, the electrode wiring pattern 30 and the planar heating element 40 are sequentially formed on the insulating layer 20, but the present invention is not limited thereto. That is, the electrode wiring pattern can be formed after the planar heating element is formed on the insulating layer.

The cover layer 50 is formed so as to cover the insulating layer 20 on which the plurality of surface heat emission elements 40 are formed. The cover layer 50 protects the electrode wiring pattern 30 and the plurality of surface heating elements 40 formed on the insulating layer 20 from the external environment. As the material of the cover layer 50, a metal foil in which an insulating adhesive layer is formed on the contact surface between the epoxy resin, the urethane resin, the silicone resin, the imide resin or the surface heat emission element 40 may be used. As the material of the insulating adhesive layer, urethane or epoxy resin can be used. For example, the cover layer 50 may be bonded to the insulating layer 20 by a hot pressing or laminating method.

As described above, the heater 80 according to the first embodiment includes a plurality of planar heating elements 40 that can be driven with low power, and thus exhibits a high heating value with low power consumption.

Since the area heating area of the area heating element 40 is large, heat loss during the heat transfer process can be minimized.

Since the planar heating element 40 can be designed in various ways through the printing process, the heater 80 according to the first embodiment can be manufactured to be driven at various driving voltages usable in the equipment or the environment in which it is used.

Since the area heating element 40 is formed of a heating element composition in the form of a paint containing conductive particles and a mixed binder, it has advantages of low resistivity and excellent thermal conductivity, which is advantageous for low voltage driving and has a high heating rate. That is, since the heat generating composition includes a mixed binder including hexamethylene diisocyanate or epoxy acrylate, polyvinyl acetal, and phenol resin together with the conductive particles, the heat resistance can be maintained even at a temperature of 200 ° C or higher. Accordingly, the heater 80 according to the first embodiment can provide a heater having the surface heat emission element 40 having a small change in resistance with temperature and high heat generation behavior and stability.

Since the planar heating element 40 formed of the heating element composition including the carbon nanotube particles and the graphite particles is a black body, the heater 80 according to the first embodiment improves additional energy efficiency due to blackbody radiation Can be obtained. Since the heater 80 according to the first embodiment also emits far-infrared rays due to the blackbody radiation, the far-infrared rays useful for the user can be provided.

The heating element composition can provide the heater 80 according to the first embodiment, which has a low specific resistance and is easy to control the thickness, and can be heated at a low temperature and a low power.

Since the heating element composition is capable of screen printing, roll-to-roll gravure printing, roll-to-roll comma coating, flexo printing and offset printing, it is advantageous for mass production of the heater 80 according to the first embodiment, Can be solved.

Thus, since the heater 80 according to the first embodiment includes the electrode wiring pattern 30 and the planar heating element 40 capable of driving the low voltage, high heating performance can be exhibited with low power. Since the area heating element 40 is formed of a heating element composition in the form of a paint including carbon particles and a binder, it has advantages of low resistivity and excellent thermal conductivity, which is advantageous for low voltage driving and fast heating rate. As a result, the heater 80 according to the first embodiment can quickly heat the solid cigarette.

As described above, according to the first embodiment, the solid-state cigarette inserted in the heater 80 is rapidly heated by the PWM control for the high calorific power generated at low power in the tubular heater 80 based on the nanocarbon particles .

That is, the heater 80 according to the first embodiment exhibits a thermal density of 2 W / cm 2 or more per unit area while instantaneously generating a high calorific value of 500 ° C or more even at a low voltage of 3 to 4V. Therefore, peak heating is performed at 350 to 400 ° C for a few seconds in the initial period using the rapid heating speed of the heater 80, and PWM control is performed so as to maintain the temperature at 250 to 350 ° C, Can be heated quickly. In addition, the durability and service life of the heater 80 due to the high heating value of the heater 80 can be prevented from being lowered through the PWM control.

Therefore, the electric heating type smoking device including the heater 80 according to the first embodiment can continuously smoothen two or more solid type cigarettes, so that the convenience of the user can be increased.

Since the heater 80 according to the first embodiment is formed in a tube shape so that a solid cigarette can be inserted, it is not necessary to separately fabricate a structure for mounting the solid cigarette.

Since the heater 80 according to the first embodiment is directly formed by coating or casting the insulating layer 20 on the metal foil 10, the adhesive used between the conventional metal foil (metal structure) and the insulating layer Use can be excluded. As a result, the problems caused by the use of the conventional adhesive can be solved.

A method of manufacturing the heater 80 according to the first embodiment will be described with reference to FIGS. 2 to 16. FIG. 5 to 16 are views showing steps of a method of manufacturing the heater 80 according to the first embodiment of the present invention.

First, as shown in Figs. 5 and 6, a plate-like thin metal plate 10 is prepared. At this time, the thickness of the thin metal plate 10 is 1 mm or less.

The reason why the thin metal plate 10 having a thickness of 1 mm or less can be used is because the thin metal plate 10 is used to manufacture a film heater and then rolled to produce a tubular heater 80. Further, when a thin metal plate exceeding 1 mm is used, the heat capacity of the thin metal plate is increased, and time and much power are consumed for heating the thin metal plate. Therefore, in the first embodiment, since the metal thin plate 10 having a thickness of 1 mm or less is rolled into a tube shape, the heat capacity of the metal thin plate can be reduced compared with the conventional method, the time for heating the solid cigarette can be shortened, have.

Next, as shown in FIG. 7, an insulating layer 20 is formed on the upper surface 13 of the thin metal plate 10. The insulating layer 20 may be formed by a coating or casting method.

At this time, the insulating layer 20 is formed inside the joining portion 17 to be formed at both ends of the thin metal plate 10.

Next, a metal layer 39 is formed on the insulating layer 20, as shown in FIG. That is, the metal layer 39 may be formed by bonding a metal foil on the insulating layer 20. Alternatively, metal may be deposited on the insulating layer 20 to form the metal layer 39.

Next, as shown in FIG. 9, an electrode wiring pattern 30 is formed by patterning a metal layer. At this time, as a method of patterning the metal layer, photolithography may be used.

The electrode wiring pattern 30 includes a pair of electrode pads 31 and a pair of electrode terminals 35. The pair of electrode pads 31 are spaced apart from each other at a predetermined interval and receive power. The pair of electrode terminals 35 are connected to the pair of electrode pads 31 and extend to connect the plurality of planar heating elements in parallel.

The electrode wiring pattern 30 has a structure in which a pair of electrode pads 31 are connected to one side of a pair of electrode terminals 35 in the vertical direction. That is, the electrode wiring pattern 30 may be formed in a translucent shape.

The pair of electrode pads 31 are connected to one ends of the pair of electrode terminals 35, and a cable for supplying power is connected. These pair of electrode pads 31 protrude out of the cover film (50 in Fig. 12) and are supplied with electric power through the cable. A cable for supplying positive (+) power is connected to one of the pair of electrode pads 31, and a cable for supplying negative (-) power is connected to the other.

The pair of electrode pads 31 are formed so as to be spaced apart from the plurality of planar heating elements. In the first embodiment, the example in which the pair of electrode pads 31 are formed at the positions spaced apart from the planar heating elements 50 located at the outermost positions in the direction in which the plurality of planar heating elements are arranged is described, no.

The pair of electrode terminals 35 includes a first electrode terminal 35a and a second electrode terminal 35b. The first electrode terminal 35a may be formed in a straight line shape and the second electrode terminal 35b may be formed in a shape that surrounds the first electrode terminal 35a in a diagonal shape.

On the other hand, in the electrode wiring pattern 30 according to the first embodiment, an example in which a pair of electrode pads 31 are vertically connected to one side of a horizontally formed pair of electrode terminals 35 is formed as a translator It is not limited thereto. It is needless to say that the present invention can also be implemented with an alphabet letter " T " shape according to the position of a pair of electrode pads connected to a pair of electrode terminals.

Next, as shown in FIGS. 10 and 11, a plurality of planar heating elements 40 are formed by printing a heating element composition on the insulating layer 20, followed by thermosetting and aging. The plurality of planar heating elements 40 are formed on the insulating layer 20 between the pair of electrode terminals 35 and the pair of electrode terminals 35 to form a pair of electrode terminals 35 do. A pair of electrode pads 31 of the electrode wiring pattern 30 are exposed to the outside of the surface heating element 40.

As the printing method of the surface heat emission element 40, screen printing, gravure printing (to roll to roll gravure printing), comma coating (to roll to roll comma coating), flexo, imprinting, offset printing and the like can be used. Thermal curing may be performed at 100 ° C to 180 ° C, and aging may be performed at 250 ° C to 350 ° C.

The plurality of surface heat emission elements 40 connecting the pair of electrode terminals 33 are formed so as to have a curved portion at an intermediate portion rather than a straight line. The curvature of the planar heating element 40 may be the same as that of a sine wave or a wavy pattern. The planar heating element 40 is formed such that the radius of curvature of the curved portion is 2 cm or less. If the radius of curvature of the curved portion exceeds 2 cm, the length of the planar heating element becomes long and the number of planar heating elements that can be formed between the pair of electrode terminals 33 is reduced, Problems can arise.

The reason why the surface heat emission element 40 is formed so as to have such a curvature is to increase the contact area between the surface heat emission element 40 and the thin metal plate 10 when the film heater is in the form of a tube. So that the film heater can be stably rotated in the shape of a tube. And because the area heating element 40 having a curved portion has a larger cross-sectional area than that of the linear type area heating element, the heating area can be increased.

Although one surface heat emission element 40 may be formed on the pair of electrode terminals 33, the reason for forming the plurality of surface heat emission elements 40 is to reduce the amount of power used for heat generation of the surface heat emission element 40.

Thus, the power consumption, the heat transfer loss, and the manufacturing cost of the heater according to the first embodiment can be reduced, and the heat capacity of the thin metal plate 10 can be minimized.

12 and 13, a cover layer 50 is formed on the insulating layer 20 so as to cover the electrode wiring pattern 30 and the plurality of planar heating elements 40. Next, as shown in Figs. As a method of forming the cover layer 50, a hot pressing or a laminating method may be used.

A window 51 is formed in the cover layer 50 so as to correspond to the pair of electrode pads 31 so that a pair of electrode pads 31 of the electrode wiring pattern 30 are exposed. The pair of electrode pads 31 are exposed to the outside through the window 51 of the cover layer 50 when the cover layer 50 is formed on the insulating layer 20. [ The joint 17 is also exposed to the outside of the cover layer 50.

As described above, the electrode wiring pattern 30 includes a pair of electrode pads 31 and a pair of electrode terminals 35. The surface heat emission element 40 is formed to connect the pair of electrode terminals 35 and is sealed by the cover layer 50. The pair of electrode pads 31 are connected to the pair of electrode terminals 35 and protruded out of the cover layer 50 to receive power.

Next, as shown in Figs. 14 and 15, the plate-shaped film heater 80a can be obtained by cutting off the portions except for the bonding portion 17 and the electrode wiring pattern 30. Fig. Namely, the joint portions 17 are left on both sides of the electrode wiring pattern 30 of the translator-like shape, and the remaining portions are cut out to obtain the film heater 80a. The film heater 80a has a translator shape corresponding to the shape of the electrode wiring pattern 30.

The bonding portion 17 is located on both sides of the pair of electrode terminals 35 of the electrode wiring pattern 30. [ And a pair of electrode pads 31 are located on one side in a direction perpendicular to the imaginary line connecting the pair of junctions 17. [ In the first embodiment, the pair of electrode pads 31 are formed on the side where one pair of the joining portions 17 is located, but the present invention is not limited to this.

Then, as shown in FIG. 16, the film heater 80a is rolled into a tube shape so that the metal thin plate 10 faces the inner side, and the joint portions 17 located at both ends are overlapped.

Then, as shown in Figs. 3 and 4, the heater 80 according to the first embodiment can be obtained by joining the overlapped joining portions 17 of the dried film heater in the form of a tube. Ultrasonic or laser welding methods may be used as the bonding method. The laser welding method may be a yag laser, a fiber laser, a femto laser, or the like.

Although not shown, the power supply cable is connected to the electrode pad 31 exposed to the outside of the cover layer 50. Plating may be performed on the surface of the electrode pad 31 in order to ensure stable bonding with the power supply cable and good electrical conductivity. As the plating material, copper, nickel, gold and the like may be used.

The heater 80 according to the first embodiment having such a structure exhibits a thermal density of 2 W / cm 2 or more per unit area while instantaneously generating a high calorific value of 500 ° C or more even at a low voltage of 3 to 4V. For example, when DC 2 to 3.7 V is applied to the electrode wiring pattern 30, the distance between the pair of electrode terminals 35 on which the area heating element 40 is formed may be 4 mm to 6.5 mm.

On the other hand, in the method of manufacturing the heater 80 according to the first embodiment, one heater 80 is manufactured using the thin metal plate 10, but the present invention is not limited thereto. As shown in Fig. 17, a plurality of heaters can be collectively manufactured by using the thin metal strip 19.

17, the metal thin plate strip 19 includes a unit film heater 10 having an arrayed unit thin metal plate 10, and unit film heaters 80a each having an electrode wiring pattern 30 formed on the unit thin metal plate 10 .

In the method of manufacturing the heater 80 according to the first embodiment, the electrode wiring pattern 30 is formed by photolithography using a metal foil. However, the present invention is not limited thereto. For example, the electrode wiring pattern 30 may be formed on the insulating layer 10 by a printing method using a metal paste.

Wherein the metal paste comprises a mixed binder, silver powder and conductive particles comprising carbon nanotube particles, an organic solvent and a dispersant. Here, the density of the metal paste may be 2 g / cm 3 or less, and preferably 1.7 to 2 g / cm 3.

As the carbon nanotube particles and graphite particles contained in the conductive particles, the organic solvent, and the dispersing agent, materials used in the heating element composition can be used, detailed description thereof will be omitted.

The conductive particles may include silver powder and carbon nanotube particles, and may further include graphite particles.

The silver powder may have the form of a flake, a sphere, a polygonal plate, a rod, or the like.

The silver powder may be added in an amount of 50 to 80 parts by weight based on 100 parts by weight of the metal paste. When the amount is less than 50 parts by weight, the electrical network of the silver powder is not formed and the resistance is high. When the amount is more than 80 parts by weight, the durability against stress is lowered and the cost may increase.

By adding 50 to 80 parts by weight of the silver powder, a metal paste having a density of 2 g / cm 3 or less can be realized, and the electrical conductivity of the electrode wiring pattern to be manufactured can be increased. Here, the tap density of the silver powder may be 2.5 g / cm 3 or less.

[Second Embodiment]

On the other hand, in the first embodiment, the example in which the thin metal plate 10 is positioned inside can be described, but the present invention is not limited thereto. For example, as shown in Figs. 18 and 19, the metal thin plate 10 can be formed so as to be located on the outer side.

18 is a perspective view showing a heater 180 according to a second embodiment of the present invention. 19 is an enlarged view of a portion " C " in Fig.

18 and 19, the heater 180 according to the second embodiment has a structure in which the thin metal plate 10 is located on the outer side and the lid layer 50 is located on the inner side. That is, the heater 180 according to the second embodiment is characterized in that the insulating layer 20, the electrode wiring pattern 30, the plurality of surface heating elements 40, and the cover layer 50 are sequentially formed on the inner surface of the thin metal plate 10 And has a laminated structure. Here, the inner surface of the thin metal plate 10 is the upper surface 13.

[Third Embodiment]

20 is a view showing a heater according to a third embodiment of the present invention.

20, the heater 280 according to the third embodiment has a structure in which the thin metal plate 10 is located on the inner side and the lid layer 50 is located on the outer side, and a heat insulating layer 70 ) Is formed. That is, the heater 280 according to the third embodiment has a structure in which an insulating layer, an electrode wiring pattern, a plurality of surface heating elements, a cover layer 50, and a heat insulating layer 70 are sequentially stacked on the outer surface of the thin metal plate 10 .

At this time, the structure in which the insulating layer 20, the electrode wiring pattern, the plurality of surface heat emission elements, and the cover layer 50 are formed on the outer surface of the thin metal plate 10 is the same as the heater according to the first embodiment, .

The heat insulating layer (70) suppresses the heat generated in the surface heat generating element from being radiated outward through the cover layer (50) to be lost. As the material of the heat insulating layer 70, a plastic material having heat resistance and electrical insulation or porous silicon can be used. For example, as the material of the heat insulating layer 70, a silicone tube having an air layer therein, porous silicon, PFA (Perfluoroalkoxy), aramid fiber, or the like may be used, but the present invention is not limited thereto.

Thus, by forming the heat insulating layer 70 on the outer surface of the heater 280 according to the third embodiment, the heat generated in the surface heating element can be prevented from being lost to the outside. In addition, the heat insulating layer 70 can transmit heat to the side where the solid cigarette is inserted, thereby further shortening the time for heating the solid cigarette and further reducing the power consumption.

On the other hand, when the temperature sensor is formed on the cover layer 50, it may be covered with the heat insulating layer 70 covering the cover layer 50, or a part thereof may be exposed to the outside.

[Fourth Embodiment]

FIG. 21 is a plan view showing the heater of the heater 380a according to the fourth embodiment of the present invention.

21, the film heater 380a of the heater according to the fourth embodiment includes a thin metal plate 10, an insulating layer 20, an electrode wiring pattern 30, a plurality of surface heating elements 40, 50).

The electrode wiring pattern 30 is formed on the insulating layer 20 so that a plurality of the surface heating elements 40 can be electrically connected and arranged in parallel. The electrode wiring pattern 30 includes a pair of electrode pads 31, a pair of connection wirings 33, and a plurality of electrode terminals 35.

The pair of electrode pads 31 are spaced apart from each other by a predetermined distance. The pair of connection wirings 33 are connected to the pair of electrode pads 31 and extend in one direction. The plurality of electrode terminals 35 are respectively connected to the pair of connection wirings 33 and extend to the facing connection wirings 33. A plurality of surface heat emission elements (40) are connected to a pair of electrode terminals (35) connected to a pair of connection wirings (33). In the fourth embodiment, the four surface heat emission elements 40 are formed on the pair of electrode terminals 35. However, the present invention is not limited thereto.

Here, the pair of electrode pads 31 are connected to one end of the pair of connection wirings 33, and a cable for supplying power is connected. The pair of electrode pads 33 include a first electrode pad and a second electrode pad. The pair of electrode pads 33 protrude out of the cover film 50 and receive power through the cable. A cable for supplying positive (+) power is connected to one of the pair of electrode pads 31, and a cable for supplying negative (-) power is connected to the other.

A pair of electrode pads (31) are formed so as to be spaced apart from the plurality of surface heat emission elements (40). Although the first embodiment discloses an example in which a pair of electrode pads 31 are formed at positions spaced apart from the outermost surface heat emission element 40 in the direction in which the plurality of surface heat emission elements 40 are arranged, But is not limited thereto.

The pair of connection wirings 33 are connected to the corresponding electrode pads 31 and are formed outside the plurality of planar heating elements 40 along the direction in which the plurality of planar heating elements 40 are arranged. The pair of connection wirings 33 includes a first connection wiring 33a connected to the first electrode pad and a second connection wiring 33b connected to the second electrode pad, And a plurality of surface heat emission elements 40 are disposed between the plurality of surface heat emission elements 33a and 33b. The first and second connection wirings 33a and 33b may be formed in a straight line parallel to each other.

The plurality of electrode terminals 35 are connected to a pair of connection wirings 33, respectively. The plurality of electrode terminals 35 include a plurality of first electrode terminals 35a connected to the first connection wiring 33a and a plurality of second electrode terminals 35b connected to the second connection wiring 33b do. The plurality of first electrode terminals 35a are formed toward the second connection interconnection 33b and are spaced apart from the second connection interconnection 33b. The plurality of second electrode terminals 35b are formed toward the first connection wiring 33a and are spaced apart from the first connection wiring 33a.

The planar heating element 40 is formed so as to connect the first and second electrode terminals 35a and 35b with a pair of the first electrode terminal 35a and the second electrode terminal 35b. The first and second electrode terminals 35a and 35b are formed to be parallel to each other and may be formed perpendicular to the first and second connection wirings 33a and 33b.

When the first and second connection wirings 33a and 33b are formed in a straight line parallel to each other, a plurality of the surface heat emission elements 40 connected to the plurality of first electrode terminals 35a and the plurality of second electrode terminals 35b May be formed in a line. The plurality of planar heating elements 40 receive power through the first and second electrode terminals 35a and 35b and generate heat.

The plurality of planar heating elements 40 are arranged in a line and are electrically connected in parallel to the electrode wiring pattern 30. The reason for connecting in parallel is to suppress the voltage drop in the process of applying power to the plurality of surface heat emission elements 40 through the electrode wiring pattern 30.

The plurality of planar heating elements 40 are elongated in a direction in which the film heater 380a is dried in a tubular form. That is, the plurality of surface heat emission elements 40 are formed in the direction in which the first and second connection wirings 33a and 33b are formed. By forming the plurality of surface heat emission elements 40 in this manner, the contact area between the surface heat emission element 40 and the thin metal plate 10 can be increased when the plate-like film heater 380a is formed into a tube shape, ) In a tubular form so that it can be steadily rotated.

Of course, the plurality of area heating elements 40 may be formed so as to have a curved part in the middle part rather than a straight shape.

[Experimental Example]

In order to confirm the characteristics of the heater according to this embodiment, the following experiment was performed.

First, a heating element composition was prepared as follows. Carbon nanotubes and graphite particles were added to a solvent of carbitol acetates, a dispersant was added, and a carbon nanotube / graphite dispersion (Solution A) was prepared by ultrasonication for 60 minutes. A master batch (M / B) is prepared by mixing the epoxy acrylate, the phenolic resin and the polyvinyl acetal resin, adding the mixture to a carbitol acetate solvent, and mechanically kneading the mixture by mechanical stirring or rotation. Respectively. Then, Solution A and M / B were kneaded through physical stirring and then kneaded completely using a 3-roll mill to prepare a heating element composition.

Using the heating element composition prepared by the above-described manufacturing method, a sample heater was produced as shown in Figs. 22 to 24. 22 is a photograph showing the film heater 380a according to the fourth embodiment formed on the metal thin plate strip 19 before punching. 23 is a photograph showing the upper surface of the fifth film heater 380a after punching in Fig. And Fig. 24 is a photograph showing the lower surface of the sample No. 5 film heater 380a of Fig.

Referring to FIG. 22, the first to ninth heaters 380a according to the fourth embodiment can be collectively manufactured by using the thin metal strip 19.

That is, polyimide or high heat-resistant insulating ink is first cast on the metal thin plate strip 19 made of SUS material having a thickness of 0.025 to 0.03 mm, followed by drying and thermosetting to form the insulating layer 20. Next, a metal layer of a brass material is formed on the insulating layer 20. Next, the metal wiring layer is patterned by a photolithography process to form an electrode wiring pattern 30. Next, the heating element composition prepared by the above-described manufacturing method is screen printed using a 250 mesh screen mask according to the electrode wiring pattern 30, and then the printed heating composition is thermally cured at 100 ° C to 180 ° C, And aged at 350 캜 to form a plurality of surface heat emission elements 40. The cover layer 50 is then hot-pressed on the insulating layer 20 on which the electrode wiring pattern 30 and the area heating element 40 are formed to collectively produce a plurality of film heaters 380a on the thin metal strip 19 Respectively.

23 and 24, an individual film heater 380a can be obtained by punching a plurality of film heaters 380a at the metal thin plate strip 19. [ Here, the individual film heater 380a shown in Fig. 23 and Fig. 24 is the film heater 380a of the sample No. 5.

Then, the individual film heater 380a is rolled into a tube shape so that the metal thin plate 10 faces the inner side, and the joint portions 17 located at both ends are overlapped.

Then, the overlapped joint portion 17 of the dried film heater 380a in the form of a tube was bonded with a fiber laser to produce a heater of Samples 1 to 9. At this time, butt welding is performed at a feed speed of 20 mm / s to 30 mm / s with a power of 40 to 60 W by using a fiber laser, so that the overlapped joint portion 17 of the dried film heater 380a is joined do.

25 is a graph showing the exothermic behavior when DC 2 V is applied to the heater of sample 5.

Referring to FIG. 25, the heating behavior of the thin metal plate when the driving voltage DC 2V is applied to the heater of sample 5 and the cooling behavior when the driving voltage is off (off) are shown. When the DC 2V is applied, it can be confirmed that the metal thin plate is heated up to 300 ° C at a speed of about 25 seconds.

Therefore, it can be predicted that when the heater is applied to the heater of the sample 5 at a driving voltage of DC 2V or more, the metal thin plate will be heated to 300 ° C or more in a time shorter than 25 seconds.

Table 1 shows the results of measurement and calculation of heat generation characteristics and electrical characteristics when driving voltages DC 2V and 3.7V were applied to the heaters 1 to 9.

Referring to Table 1, when the DC 3.7 V is applied, it is expected that the heaters 1 through 9 will generate heat at a temperature higher than 500 ° C. However, at a high temperature of 500 ° C or more, the heaters 1 to 9 of the sample are difficult to maintain their durability and service life, and the power consumption is also high, such as 8 W or more.

As described above, a heater having a thermal density of 2 W / cm 2 or more per unit area and capable of generating heat at 500 ° C or more at a drive voltage of 3.7 V and having an output of 8 W or more can not be driven without control.

Therefore, when DC 3.7 V is applied to the heater according to samples 1 to 9, temperature control through PWM control is required as shown in Fig. Here, FIG. 26 is a schematic diagram of PWM control of the sample No. 5 heater.

Referring to Fig. 26, a is a heating behavior profile when a driving voltage of less than 3.7V is applied to the heater of sample No. 5, and a1 is PWM control while applying a driving voltage of less than 3.7V to the heater of the sample No. 5 Is the heat behavior profile performed.

b is the actual exothermic behavior profile when DC 3.7V is applied to the sample No. 5 heater, and b1 is the exothermic behavior profile obtained by performing PWM control while applying DC 3.7V to the sample No. 5 heater.

Comparing the a profile with the b profile, it can be seen that the heating rate increases as the applied driving voltage increases.

The solid cigarettes inserted in the heater are heated at a temperature of 150 to 160 DEG C by PWM control so as to peak at 350 to 400 DEG C by using a rapid heating rate of the heater of the sample No. 5, Lt; / RTI >

When DC 3.7V is applied as the driving voltage, it takes a time of 3 seconds or less to perform peak heating at 350 to 400 ° C. By allowing the heater to be maintained at 250 to 350 DEG C through the PWM control, the solid cigarette inserted into the heater can be quickly heated to 150 to 160 DEG C within 10 seconds. This PWM control can suppress the deterioration of the durability and lifespan of the heater due to the high heating value of the heater No. 5.

When the driving voltage of DC 2 V and DC 3.7 V is applied to the heaters 1 to 9, the power ratio is 3.4 to 4.8. When the driving voltage of DC 3.7V is applied to the sample 1 to 9 heater, the thermal density is 2 W / cm 2 or more.

It should be noted that the embodiments disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: metal sheet
11: Lower surface
13: upper surface
17:
19: Sheet metal strip
20: Insulation layer
30: electrode wiring pattern
31: Electrode pad
33: Connection wiring
35: Electrode terminal
39: metal layer
40: Planar heating element
50: cover layer
51: Window
70: insulating layer
80, 180, 280: heater
80a, 380a: Film heater
81:
83: Inlet
90: Electric heating smoking device
91: Temperature sensor
93:
95: Solid tobacco
100: solid electronic cigarette

Claims (12)

Metal plate in the form of a tube;
An insulating layer covering one surface of the thin metal plate;
An electrode wiring pattern formed on the insulating layer;
A plurality of electrode wiring patterns formed by printing a heating element composition based on nano carbon particles on the insulating layer so as to be connected to the electrode wiring patterns, Plane heating elements; And
And a cover layer covering the insulating layer on which the plurality of planar heating elements are formed,
When a driving voltage of DC 2V and DC 3.7V is applied to the electrode wiring pattern, the power ratio is 3.4 to 4.8,
The heating element composition for forming the plurality of area heating elements
Carbon particles including carbon nanotube particles and graphite particles,
Silver, conductive particles comprising a metal powder of copper or nickel; And
A mixed binder comprising hexamethylene diisocyanate, polyvinyl acetal and a phenolic resin or comprising an epoxy acrylate, a polyvinyl acetal and a phenolic resin,
Wherein the conductive particles comprise 0.1 to 5 parts by weight of carbon nanotube particles, 0.1 to 20 parts by weight of graphite particles and 10 to 60 parts by weight of metal powder with respect to 100 parts by weight of the exothermic composition. The method according to claim 1,
And a thermal density of 2 W / cm 2 or more when a driving voltage of DC 3.7 V is applied to the electrode wiring pattern. The method according to claim 1,
A heat insulating layer covering the cover layer;
And a heater for heating the electric heater. The method of claim 3,
Wherein the material of the heat insulating layer includes a silicone tube having an air layer therein, porous silicon, PFA (Perfluoroalkoxy), or aramid fibers. The method according to claim 1,
Wherein the insulating layer is formed on one surface of the thin metal plate by coating or casting. delete The method according to claim 1,
Wherein the plurality of planar heating elements include bent portions. And a plurality of planar heating elements having a tube shape in which one end of the solid cigarette is inserted and generating heat when power is supplied, wherein the plurality of planar heating elements are formed by printing a heating element composition based on nanocarbon particles;
A temperature sensor attached to the heater to measure and deliver the temperature; And
The temperature of the heater is peak-heated to 350 to 400 ° C. at the beginning, and then the temperature of the heater is 250 ° C., To 350 < 0 > C,
The heating element composition for forming the plurality of area heating elements
Carbon particles including carbon nanotube particles and graphite particles,
Silver, conductive particles comprising a metal powder of copper or nickel; And
A mixed binder comprising hexamethylene diisocyanate, polyvinyl acetal and a phenolic resin or comprising an epoxy acrylate, a polyvinyl acetal and a phenolic resin,
Wherein the conductive particles comprise 0.1 to 5 parts by weight of carbon nanotube particles, 0.1 to 20 parts by weight of graphite particles and 10 to 60 parts by weight of metal powder with respect to 100 parts by weight of the exothermic composition. 9. The apparatus according to claim 8,
Metal plate in the form of a tube;
An insulating layer covering one surface of the thin metal plate;
An electrode wiring pattern formed on the insulating layer;
The plurality of planar heating elements formed by printing the heating element composition on the insulating layer so as to be connected to the electrode wiring pattern, receiving the power from the electrode wiring pattern and generating heat, and being connected in parallel to the electrode wiring pattern in a plurality of rows; And
And a cover layer covering the insulating layer on which the plurality of planar heating elements are formed,
Wherein electric power ratio is 3.4 to 4.8 when driving voltage of DC 2V and DC 3.7V is applied to the electrode wiring pattern. 10. The apparatus according to claim 9,
Wherein a thermal density is 2 W / cm 2 or more when a driving voltage of DC 3.7 V is applied to the electrode wiring pattern. 10. The apparatus according to claim 9,
When the drive voltage of DC 3.7V is applied to the electrode wiring pattern, the temperature of the heater is peak-heated to 350 to 400 ° C within 3 seconds, and then PWM control is performed so as to maintain the temperature at 250 to 350 ° C. Device. 10. The method of claim 9,
Wherein the heater further comprises a heat insulating layer covering the cover layer,
Wherein the temperature sensor is formed on the cover layer and covered with the heat insulating layer.

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