KR102087723B1 - Electric heating type smoking device using PWM control - Google Patents

Abstract

The present invention relates to an electric heating type smoking device, and is intended to rapidly heat a solid cigarette through pulse width modulation (PWM) control for a high heat generation amount generated by low power in a heater. The present invention has a heater having a plurality of planar heating elements based on nano-carbon particles that have a tube shape into which one end of a solid type cigarette is inserted and generate heat by receiving power, and a temperature sensor attached to the heater to measure and deliver the temperature, and It provides an electric heating type smoking device using a PWM control method including a control unit for controlling the on / off of the heater in a PWM manner based on the temperature received from the temperature sensor.

Description

Electric heating type smoking device using PWM control method

The present invention relates to a solid type electronic cigarette, and more specifically, an electric heating type smoking using a PWM control method for rapidly heating a solid type cigarette through PWM (pulse width modulation) control for a high heating value generated by low power in a heater. It is about the device.

A general combustion type cigarette is a method of inhaling smoke by combustion through ignition of a lighter or a match. These combustion-type cigarettes inhale a large amount of harmful substances such as tar and heavy metals.

In order to solve these problems, a solid electronic cigarette in which a cigarette (hereinafter referred to as a "solid cigarette") is steamed by electric heating has been introduced. It is a cigarette that can lower the inhalation of harmful substances and smoke through steam without smoke.

In order to enjoy such a solid type electronic cigarette, an electric heating type smoking device which is a dedicated electronic device is required. The electrically heated smoking device includes a heater necessary to steam solid cigarettes.

A heating blade or a metal etched film heater is used as a heater for a conventional electric heating type smoking device. However, there is a problem in that it takes a lot of time and power to heat the metal structure of the heating blade or the metal etched film heater to a temperature required to steam the solid cigarette. In addition, since the power consumption of the heater is large, there is a problem in that two or more solid type cigarettes cannot be continuously smoked with the existing electric heating type smoking device.

Korean Registered Patent No. 10-1655716 (2016.09.01. Registered)

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

Another object of the present invention is to provide an electrically heated smoking device using a PWM control method that can effectively reduce the time required to steam a solid cigarette by effectively controlling the process of transferring heat generated from the heater to the solid cigarette.

In order to achieve the above object, the present invention is a metal sheet 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; It is formed by printing a nanocarbon particle-based heating element composition on the insulating layer to be connected to the electrode wiring pattern, and receiving power from the electrode wiring pattern to generate heat, and a plurality of rows connected in parallel to the electrode wiring pattern in parallel. Planar heating element; And a cover layer covering the insulation layer on which the plurality of planar heating elements are formed. At this time, when driving voltages of DC 2V and DC 3.7V are applied to the electrode wiring pattern, the power ratio is 3.4 to 4.8.

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

The heater for an electric heating type smoking device 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 silicone tube having an air layer therein, porous silicone, perfluoroalkoxy (PFA) or aramid fiber.

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

The plurality of planar heating elements may include conductive particles including carbon nanotube particles and graphite particles; And a mixed binder comprising hexamethylene diisocyanate, polyvinyl acetal and phenolic resin, or epoxy acrylate, polyvinyl acetal and phenolic resin.

The plurality of planar heating elements may include a curved portion.

The present invention also has a tubular shape in which one end of the solid type cigarette is inserted, a heater having a plurality of planar heating elements based on nanocarbon particles that generate heat by receiving power; A temperature sensor attached to the heater to measure and transmit temperature; And controlling the on / off of the heater using a pulse width modulation (PWM) method based on the temperature received from the temperature sensor, but after peak heating the temperature of the heater to 350 to 400 ° C initially, Provides an electrically heated smoking device using a PWM control method including; a control unit for PWM control to maintain at 250 to 350 ℃.

When the DC 3.7V driving voltage is applied to the electrode wiring pattern, the controller controls the PWM to maintain the temperature of the heater at 350 to 400 ° C within 3 seconds and then maintain the temperature at 250 to 350 ° C.

And the heater further includes an insulating layer covering the cover layer, and the temperature sensor is formed on the cover layer and is covered by the insulating layer.

According to the present invention, it is possible to quickly heat the solid cigarette inserted into the heater through PWM control for the high heating value generated with low power in the tubular heater based on the nanocarbon particles.

That is, the heater according to the present invention exhibits a heat density of 2 W / cm 2 or more per unit area while instantaneously generating a high heating value of 500 ° C. or higher even at a low voltage of 3 to 4 V. Therefore, by heating the peak to 350 to 400 ° C for a few seconds using a fast heating speed of the heater, and then PWM control to maintain it at 250 to 350 ° C, the solid cigarette inserted into the heater can be quickly heated. have. In addition, it is possible to suppress the durability and lifespan of the heater from being reduced due to the high heating value of the heater through PWM control.

In the heater according to the present invention, since the insulating layer is directly formed on the metal thin plate by coating or casting, the use of the adhesive used between the existing metal thin plate (metal structure) and the insulating layer can be excluded. This can solve the problems caused by the use of the existing adhesive. In particular, even if the heater is initially heated to a high temperature through PWM control, it is possible to maintain a stable bonding state between the metal thin plate and the insulating layer.

In the past, in order to manufacture a metal structure directly in the form of a tube, a thickness of about 1.5 mm is required, which increases the heat capacity of the metal structure and consumes time and a lot of power to heat the metal structure. The problem of inconvenience may occur. However, since the present invention is manufactured in the form of a tube by rolling a film heater on a plate formed based on a metal thin plate of 1 mm or less, it is possible to reduce the heat capacity of the metal thin plate, shorten the time to heat the solid cigarette and use power Can be reduced.

Since the heater according to the present invention is implemented in the form of a tube so that the solid cigarette can be inserted, there is no need to separately manufacture a structure for mounting the solid cigarette.

Since the heater according to the present invention includes an electrode wiring pattern and a planar heating element capable of driving at a low voltage, it can exhibit high heating characteristics at low power. Since the planar heating element is formed of a heating element composition in the form of a coating containing nano carbon particles and a mixed binder, it has the advantage of low specific resistance and excellent thermal conductivity, and is advantageous for low voltage driving and high heating rate. Due to this, the heater according to the present invention can rapidly heat the solid cigarette.

Since the heater according to the present invention includes a planar heating element formed to have a bend, when it is rolled into a tube shape, it is possible to increase the contact area between the planar heating element and the metal thin plate. Due to this, the heater according to the present invention can reduce power consumption, heat transfer loss and manufacturing cost, and minimize the heat capacity of the metal thin plate.

And by forming a heat insulating layer on the outer surface of the heater according to the present invention, it is possible to suppress the heat generated by the planar heating element is discharged to the outside is lost. In addition, the heat insulating layer allows heat to be transferred toward the solid cigarette is inserted, thereby reducing the time for heating the solid cigarette and further reducing power consumption.

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

It should be noted that in the following description, only parts necessary for understanding the embodiments of the present invention are described, and descriptions of other parts will be omitted without detracting from the gist of the present invention.

The terms or words used in the present specification and claims described below should not be construed as being limited to ordinary or dictionary meanings, and the inventor is appropriate as a concept of terms to describe his or her invention in the best way. It should be interpreted as a meaning and a concept consistent with the technical idea of the present invention based on the principle that it can be defined as such. Therefore, the configuration shown in the embodiments and drawings described in this specification is only a preferred embodiment of the present invention, and does not represent all of the technical spirit of the present invention, and various equivalents that can replace them at the time of this application It should be understood that there may be and variations.

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-state electronic cigarette according to the present invention.

Referring to FIG. 1, the solid-state electronic cigarette 100 according to the present invention includes a solid-type cigarette 95 and an electrically heated smoking device 90. The solid-state electronic cigarette 100 is an electronic cigarette that is used by inserting a solid-type cigarette 95 in the form of a stick into an electric-heated smoking device 90 and heating it electrically, unlike a liquid-type electronic cigarette using a liquid nicotine.

The solid type cigarette 95 has a shape similar to that of a general combustion type cigarette. That is, the solid type cigarette 95 is formed at one end of the tobacco part 95b and the tobacco part 95b, and a filter part for filtering harmful substances contained in the aerosol generated by steaming the tobacco part 95b. (95a). At this time, the tobacco of the tobacco section 95b is a tobacco that can be steamed with heat, and is distinguished from the general combustion-type tobacco.

The electric heating type smoking device 90 according to the present invention includes a heater 80 for steaming the solid cigarette 95 by electric heating, and may further include a temperature sensor 91 and a control unit 93.

The heater 80 has a tube shape in which both openings 81 and 83 are opened, and one side of the openings 81 and 83 is an insertion hole 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 hole 81, sucks the aerosol generated by heating the solid cigarette 95 through the filter portion 95a of the solid cigarette 95. It is used as an inlet 83 when air is introduced.

The heater 80 is manufactured by rolling a film heater on a plate using a metal thin plate as a base layer. The heater 80 has a structure in which a plurality of planar heating elements based on nanocarbon particles that generate heat by receiving power from one surface of the metal thin plate are formed.

The temperature sensor 91 is attached to the heater 80 to measure the temperature and transmits it to the control unit 93. As the temperature sensor 91, a RTD (Resistance temperature detectors) type temperature sensor may be used, but is not limited thereto.

In addition, the control unit 93 controls on / off of the heater 80 based on the temperature transmitted from the temperature sensor 91. That is, the control unit 93 controls on / off of the heater 80 based on the temperature transmitted from the temperature sensor 91 so as to transfer heat at an appropriate temperature to the solid cigarette 95 inserted into the insertion port. When the control unit 93 is separated from the solid type cigarette 95 at the insertion port, the heater 80 is turned off.

At this time, the control unit 91 may control 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 of controlling by changing the duty ratio of pulses according to the size of a modulated signal. That is, the PWM control adjusts the control value by adjusting the duty ratio, and the average value of the pulse signal changes as the duty ratio of the pulse signal changes and uses the average value as the control signal value.

The control unit 91 may turn on / off the heater 80 so as to maintain an appropriate temperature for heating the solid type cigarette 95 among the temperature range that can be generated by the heater 80 through the control of the PWM method. You can. That is, the control unit 91 performs a PWM control to maintain at 250 to 350 ° C. after peak heating at 350 to 400 ° C. for an initial few seconds using the fast heating speed of the heater 80. Due to this, the solid type cigarette 95 inserted into the heater 80 can be quickly heated. Through the PWM control, it is possible to suppress the durability and life of the heater 80 from being reduced due to the high heat generation amount of the heater 80 to stably drive the heater 80.

On the other hand, although not shown, the electric heating smoking device 90 according to the present invention includes a power supply unit that supplies power to the heater 80. A primary battery or a secondary battery may be used as the power supply unit.

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

[First Embodiment]

2 is a perspective view showing a heater for an electrically heated smoking device according to a first embodiment of the present invention. 3 is an enlarged view of a portion “A” in FIG. 2. And FIG. 4 is an enlarged view of a portion “B” in FIG. 2.

2 to 4, the heater 80 according to the first embodiment has a tube shape with openings 81 and 83 into which one end of a solid type cigarette is inserted, a metal thin plate 10, and an insulating layer (20), an electrode wiring pattern 30, a plurality of planar heating elements 40 and a cover layer 50. Here, the metal thin plate 10 has a tube shape. The insulating layer 20 covers one surface 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 nanocarbon particle-based heating element composition on the insulating layer 20 so as to be connected to the electrode wiring pattern 30 and generate heat by receiving power from the electrode wiring pattern 30. And the cover layer 50 covers the insulating layer 20 on which a plurality of planar heating elements 40 are formed.

The heater 80 according to the first embodiment has a structure in which the metal thin plate 10 is located inside and the cover layer 50 is located outside. That is, in the heater 80 according to the first embodiment, the insulating layer 20, the electrode wiring pattern 30, the plurality of planar heating elements 40 and the cover layer 50 are sequentially on the outer surface of the metal thin plate 10. It has a stacked structure.

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

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

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

The insulating ink composition may be implemented in the form of a paint or solution by controlling the amount of the organic solvent.

In addition, the insulating ink composition includes 8 to 10 parts by weight of the mixed binder, 0.001 to 0.5 parts by weight of the inorganic nanoparticles, 20 to 80 parts by weight of the organic solvent, and 0.5 to 5 parts by weight of the dispersant relative to 100 parts by weight of the insulating ink composition.

Here, the same material as the mixed binder, dispersant, organic solvent, and leveling agent included in the heating element composition to be described later may be used as the mixed binder, dispersant, organic solvent, and leveling agent.

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

The inorganic nanoparticles contain 0.001 to 0.5 parts by weight based on 100 parts by weight of the insulating ink composition. Due to this, the conductive carbon particles can be distributed in the form of islands between the metrics formed by the mixed binder.

Graphene oxide particles have insulating properties 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 a mixed binder that is an organic binder. For this reason, the insulating ink composition has stable heat resistance even at a temperature of around 300 ° C.

The graphene oxide particles have functional groups having various chemical reactivity, such as carboxyl, amine, imine, hydroxyl, carbonyl, and lactone, on the surface and edge. The functional groups included in the graphene oxide particles can be chemically covalently bonded to the functional groups contained in diisocyanate, phenol, and epoxy. Therefore, the graphene oxide particles form a chemical covalent bond with the epoxy acrylate, hexamethylene diisocyanate, and phenolic resin contained in the mixed binder. Since the chemical covalent bond between the graphene oxide particles and the mixed binder forms a three-dimensional network and has an effect of inhibiting the movement of the polymer chain, it may cause an increase in glass transition and decomposition initiation temperature.

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

The conductive carbon particles may include carbon black or up to 20 layers of graphite particles. The graphite particles may have a diameter of less than 2 μm. This is because when the diameter of the graphite particles exceeds 2 μm, a problem that impulse breaking strength is lowered may occur.

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

The inorganic filler may be added for the purpose of improving reliability such as surface strength and moisture absorption characteristics of the insulating layer 20 formed using the insulating ink composition. The inorganic filler may contain 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 μm may be used. In order to increase the packing ratio, fused silica particles may use particles having two or more particle sizes.

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

The insulating layer 20 is formed on both ends of the metal thin plate 10. Both ends of the metal thin plate 10 exposed outside the insulating layer 20 are used as the junction 17. The joining portion 17 is a portion to be joined when joining both ends by rolling the film heater manufactured in a plate shape.

The electrode wiring pattern 30 is formed on the insulating layer 20 and supplies power applied from the outside to the planar heating element 40. The electrode wiring pattern 30 may be formed of a metal material to minimize voltage drop. As a metal material forming the electrode wiring pattern 30, silver, aluminum, copper, nickel, stainless steel, brass, or alloys thereof may be used.

The electrode wiring pattern 30 may 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 may be formed by depositing a metal foil on the insulating layer 20 and patterning it by an etching method. Alternatively, 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 planar heating element 40 may be formed by printing the heating element composition to be connected to the electrode wiring pattern 30, and then thermal curing and aging. As a 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. Heat curing may be performed at 100 ° C to 180 ° C, and aging may be performed at 250 to 350 ° C. The reason for forming the planar heating element 40 by aging after thermal curing is to ensure high temperature stability of the planar heating element 40.

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

The heating element composition forming the planar heating element 40 includes a mixed binder and nanocarbon particle-based conductive particles. In order to form the planar heating element 40, the heating element composition introduced into the printing process further includes an organic solvent and a dispersant in addition to the mixed binder and 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 dispersant with respect to 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 may be used. As the metal powder, a powder made 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 based on 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 μm to 100 μm.

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

Metal powders include powders of silver, copper, or nickel. In the case of silver powder, it may have a shape of flake, spherical shape, polygonal plate shape, or rod. As the copper powder, silver-coated copper (Ag coated Cu) powder, nickel-coated copper (Ni coated Cu) powder, or the like may be used. In addition, as the nickel powder, Ag coated Ni powder may be used.

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

As described above, the heating element composition may include carbon particles and metal powder, thereby increasing energy efficiency and heating rate of the planar heating element 40. That is, the metal powder does not have a blackbody radiation function. However, by including carbon particles in the heating element composition, it is possible to implement the black body radiation function. The heat resistance of the planar heating element 40 can be increased due to the carbon particles. And due to the carbon particles, it is possible to increase the heating rate and energy efficiency of the planar heating element 40.

The specific resistance of the planar heating element 40 may be determined by the content of carbon particles or metal powder in the total solid content. For example, the specific resistance can be controlled only with carbon particles up to the area of 1 × 10 ^-2 Ω㎝, but the area below that requires additional introduction of metal powder. The planar heating element 40 may have a specific resistance of 9 × 10 ^-2 to 1.1 × 10 ^-3 Ωcm.

The mixed binder contains at least two kinds of phenolic resin, acetal resin, isocyanate resin, and 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 kinds of epoxy, epoxy acrylate, hexamethylene diisocyanate, polyvinyl acetal, and phenolic resins.

For example, the mixed binder may include hexamethylene diisocyanate, polyvinyl acetal, and phenolic resins, or epoxy acrylate, polyvinyl acetal, and phenolic resins. Here, the mixed binder may include 10 to 150 parts by weight of polyvinyl acetal resin and 100 to 500 parts by weight of 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 with respect to 100 parts by weight of epoxy acrylate or hexamethylene diisocyanate, heat resistance is lowered, and when it exceeds 500 parts by weight, flexibility of the planar heating element 40 is lowered and brittleness may become strong.

By increasing the heat resistance of the mixed binder as described above, even when the planar heating element 40 is heated to a high temperature of about 300 ° C., the resistance change and breakage of the planar heating element 40 can be suppressed.

Here, the phenolic resin means a phenolic compound containing 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, Vinylaguaiacol, Syringol, Iso-eugenol, Methoxyeugenol, o- Cresol (o-Cresol), 3-methyl-1,2-benzenediol (3-methyl-1,2-Benzenediol), (z) -2-methoxy-4- (1-propenyl) -phenol (( z) -2-methoxy-4- (1-propenyl) -Phenol), 2,6-diethoxy-4- (2-propenyl) -phenol (2,6-dimethoxy-4- (2-propenyl)- Phenol), 3,4-dimethoxy-Phenol, 4-ethyl-1,3-benzenediol, 4-ethyl-1,3-Benzenediol, Resole phenol, 4-methyl-1,2-benzenediol (4-methyl-1,2-Benzenediol), 1,2,4-benzenetriol (1,2,4-Benzenetriol), 2-methoxy-6-methylphenol (2-Methoxy-6-methylphenol), 2-methoxy-4-vinylphenol or 4-ethyl-2-methoxy-Phenol Etc., limited to this It is not.

The organic solvent is for dispersing the conductive particles and the mixed binder, carbitol acetate, butyl carbotol acetate, DBE (dibasic ester), ethyl carbitol, ethyl carbitol acetate, dipropylene glycol It may be a mixed solvent of two or more selected from methyl ether, cellosolve acetate, butyl cellosolve acetate, butanol and octanol.

On the other hand, the process for dispersion can be applied to a variety of commonly used methods, for example, ultrasonic treatment (Ultra-sonication), roll mill (Roll mill), bead mill (Bead mill) or ball mill (Ball mill) through the process It can be done.

In addition, the dispersant is intended to more smoothly disperse the conductive particles, and conventional dispersants used in the art such as BYKs, amphoteric surfactants such as Triton X-100, and ionic surfactants such as SDS can be used.

In addition, the heating element composition may further include 0.1 to 5 parts by weight of a silane coupling agent as an additive with respect to 100 parts by weight of the heating element composition.

The silane coupling agent functions as an adhesion promoter that promotes adhesion between resins when blending the heating element composition. The silane coupling agent can be an epoxy containing silane or a mercapto containing silane. Examples of such silane coupling agents include epoxy (2- (3,4 epoxy cyclohexyl) -ethyltrimethoxysilane, 3-glycidoxycitrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropyltriethoxysilane, amine group-containing N-2 (aminoethyl) 3-amitopropylmethyldimethoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane , N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl Butylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, and merpento-containing 3-mertopropylmethyldimethoxysilane, 3-mertopropyltriethoxysilane, and isocyanate. 3-isopropylpropyl triethoxysilane, and the like, but are not limited thereto.

In addition, the heating element composition may further include 0.5 to 20 parts by weight of ceramic particles as an additive with respect to 100 parts by weight of the heating element composition. The ceramic particles increase the heat capacity of the planar heating element 40. Glass particles or silicon particles may be used as the ceramic particles.

In addition, the heating element composition may further include 0.0001 to 1 part by weight of graphene oxide particles as an additive with respect to 100 parts by weight of the heating element composition. Here, the graphene oxide particles have insulating properties 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 a mixed binder that is an organic binder. Due to this, the exothermic composition according to the present invention has stable heat resistance even at a temperature of around 300 ° C.

That is, the graphene oxide particles have functional groups having various chemical reactivity, such as carboxyl, amine, imine, hydroxyl, carbonyl, and lactone, on the surface and edge. The functional groups included in the graphene oxide particles can be chemically covalently bonded to the functional groups contained in diisocyanate, phenol, and epoxy. Therefore, the graphene oxide particles form a chemical covalent bond with the epoxy acrylate, hexamethylene diisocyanate, and phenolic resin contained in the mixed binder. Since the chemical covalent bond between the graphene oxide particles and the mixed binder forms a three-dimensional three-dimensional network and has an effect of inhibiting the movement of the polymer chain, it may cause 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 edge portions as described above, they exhibit good dispersibility in mixed binders and organic solvents.

Meanwhile, in the first embodiment, an example in which the electrode wiring pattern 30 and the planar heating element 40 are sequentially formed on the insulating layer 20 is disclosed, but is not limited thereto. That is, after forming the planar heating element on the insulating layer, an electrode wiring pattern may be formed.

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

As described above, since the heater 80 according to the first embodiment includes a plurality of planar heating elements 40 that can be driven at low power, it exhibits high heat generation at low power.

Since the planar heating element 40 has a large heating area, it is possible to minimize heat loss during the heat transfer process.

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

Since the planar 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 the advantage of having low specific resistance and excellent thermal conductivity, so it is advantageous for low voltage driving and has a high heating rate. That is, since the heating element composition includes a conductive binder and a mixed binder containing hexamethylene diisocyanate or epoxy acrylate, polyvinyl acetal, and a phenolic resin, heat resistance can be maintained even at a temperature of 200 ° C. or higher. Accordingly, the heater 80 according to the first embodiment may provide a heater having a planar heating element 40 having high heat generation behavior and stability due to a small change in resistance according to temperature.

Since the planar heating element 40 formed of a heating element composition including carbon nanotube particles and graphite particles is a black body, the heater 80 according to the first embodiment improves additional energy efficiency due to black body radiation. Can get Since the heater 80 according to the first embodiment also radiates far infrared rays due to black body radiation, it is possible to provide a far infrared ray beneficial to the user.

The heating element composition can provide the heater 80 according to the first embodiment capable of high-temperature heating with low voltage and low power because of low specific resistance and easy thickness control.

In addition, 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 not only for mass production of the heater 80 according to the first embodiment, but also for product length and area. It can solve the limitations.

As described above, since the heater 80 according to the first embodiment includes the electrode wiring pattern 30 and the planar heating element 40 capable of driving a low voltage, it can exhibit high heating characteristics at low power. Since the planar heating element 40 is formed of a heating element composition in the form of a paint containing carbon particles and a mixed binder, it has the advantage of having low specific resistance and excellent thermal conductivity, so it is advantageous for low voltage driving and has a high heating rate. Due to this, the heater 80 according to the first embodiment can quickly heat the solid type cigarette.

As described above, according to the first embodiment, the solid type cigarette inserted into the heater 80 is rapidly heated through PWM control for the high heating value generated by low power in the tube type heater 80 based on the nanocarbon particles. I can do it.

That is, the heater 80 according to the first embodiment exhibits a heat density of 2 W / cm 2 or more per unit area while instantaneously generating a high heating value of 500 ° C. or higher even at a low voltage of 3 to 4 V. Therefore, by using a fast heating rate of the heater 80, peak heating at 350 to 400 ° C for an initial few seconds, followed by PWM control to maintain at 250 to 350 ° C, thereby solid cigarette inserted into the heater 80 Can be quickly heated. In addition, it is possible to suppress the durability and life of the heater 80 from being reduced due to the high heating value of the heater 80 through PWM control.

Therefore, the electric heating type smoking device including the heater 80 according to the first embodiment can continuously smoke two or more solid cigarettes, thereby increasing user convenience.

Since the heater 80 according to the first embodiment is embodied in a tube shape so that a solid cigarette can be inserted, there is no need to separately manufacture a structure for mounting the solid cigarette.

In addition, in the heater 80 according to the first embodiment, since the insulating layer 20 is directly formed on the metal thin plate 10 by coating or casting, the adhesive used between the existing metal thin plate (metal structure) and the insulating layer. Use can be excluded. This can solve the problems caused by the use of the existing adhesive.

The manufacturing method of the heater 80 according to the first embodiment will be described with reference to FIGS. 2 to 16 as follows. Here, FIGS. 5 to 16 are views showing respective steps according to 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-shaped metal thin plate 10 is prepared. At this time, the thickness of the metal thin plate 10 is 1 mm or less.

The reason why the metal thin plate 10 of 1 mm or less can be used is that a film heater is manufactured using the metal thin plate 10 and then rolled to manufacture a tubular heater 80. In addition, when using a metal thin plate exceeding 1mm, the heat capacity of the metal thin plate is increased, and since the time and a lot of power are consumed to heat the metal thin plate, a problem of deteriorating user convenience may occur. Therefore, in the first embodiment, since the metal thin plate 10 of 1 mm or less is rolled and manufactured in a tube shape, the heat capacity of the metal thin plate can be reduced, and the time for heating the solid cigarette can be shortened and the power consumption can be reduced. 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 junction portion 17 to be formed at both ends of the thin metal plate 10.

Next, as shown in Figure 8, to form a metal layer 39 on the insulating layer 20. That is, the metal layer 39 may be formed by bonding a metal foil over the insulating layer 20. Alternatively, the metal layer 39 may be formed by depositing metal on the insulating layer 20.

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

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 at regular intervals, and are parts that receive power. The pair of electrode terminals 35 are connected to and extended to the pair of electrode pads 31, respectively, and a plurality of planar heating elements are connected in parallel.

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

The pair of electrode pads 31 are connected to one end of the pair of electrode terminals 35, and cables for supplying power are joined. The pair of electrode pads 31 protrude out of the cover film (50 in FIG. 12) to receive power through the cable. A cable for supplying (+) power is connected to one of the pair of electrode pads 31, and a cable for supplying (-) power is connected to the other.

The pair of electrode pads 31 are formed to be spaced apart from a plurality of planar heating elements. In the first embodiment, an example in which a pair of electrode pads 31 are formed at a position spaced apart from the planar heating element 50 located at the outermost side in a direction in which a plurality of planar heating elements are arranged, is limited to this. 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, and the second electrode terminal 35b may be formed in a shape surrounding the first electrode terminal 35a in a de-shape shape.

On the other hand, the electrode wiring pattern 30 according to the first embodiment discloses an example in which a pair of electrode pads 31 are connected in a vertical direction to one side of a pair of electrode terminals 35 formed horizontally and formed in a translator shape. It is not limited to this. For example, depending on the position of the pair of electrode pads connected to the pair of electrode terminals, it is of course possible to implement the English letter "T" shape.

Next, as shown in FIGS. 10 and 11, a heating element composition is printed on the insulating layer 20 and then heat-cured and aged to form a plurality of planar heating elements 40. At this time, 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. The pair of electrode pads 31 of the electrode wiring pattern 30 are exposed outside the planar heating element 40.

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

The plurality of planar heating elements 40 connecting the pair of electrode terminals 33 is formed to have a curved portion in an intermediate portion rather than a straight shape. The curvature of the planar heating element 40 may be formed in a curve such as a sine wave or a wavy pattern. At this time, the planar heating element 40 is formed so that the radius of curvature of the curved portion is 2 cm or less. When the radius of curvature of the curved portion exceeds 2 cm, the length of the planar heating element is increased and the number of planar heating elements that can be formed between the pair of electrode terminals 33 is reduced, so that the heating element is not rapidly generated or the heating value is lowered. Problems may arise.

The reason for forming the planar heating element 40 so as to have the bending is to increase the contact area between the planar heating element 40 and the metal thin plate 10 when the plate-shaped film heater is rolled in a tube shape. This is to stably bend the film heater when it is rolled into a tube. Also, since the planar heating element 40 having a curved portion has a larger cross-sectional area than the linear planar heating element, it is possible to increase the heating area.

In addition, although it is possible to form one planar heating element 40 on the pair of electrode terminals 33, the reason for forming the plural is to reduce the amount of power used for the heating of the planar heating element 40.

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

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

In this case, the cover layer 50 is formed with a window 51 corresponding to the pair of electrode pads 31 so that the pair of electrode pads 31 of the electrode wiring pattern 30 are exposed. Therefore, when the cover layer 50 is formed on the insulating layer 20, the pair of electrode pads 31 is exposed to the outside through the window 51 of the cover layer 50. The bonding portion 17 is also exposed outside the cover layer 50.

In this way, the electrode wiring pattern 30 includes a pair of electrode pads 31 and a pair of electrode terminals 35. A planar heating element 40 is formed to connect the pair of electrode terminals 35 and is sealed by the cover layer 50. In addition, the pair of electrode pads 31 are respectively connected to the pair of electrode terminals 35 and protrude out of the cover layer 50 to receive power.

Next, as shown in FIGS. 14 and 15, a plate-shaped film heater 80a can be obtained by cutting portions excluding the junction portion 17 and the electrode wiring pattern 30. That is, the film heaters 80a can be obtained by leaving the joints 17 on both sides around the electrode wiring pattern 30 in the shape of a translator and cutting the remaining portions. The film heater 80a has a translator shape corresponding to the shape of the electrode wiring pattern 30.

The joining portion 17 is located on both sides of the pair of electrode terminals 35 of the electrode wiring pattern 30. A pair of electrode pads 31 are positioned on one side in a direction perpendicular to the virtual line connecting the pair of joints 17. In the first embodiment, an example in which a pair of electrode pads 31 are formed on a side where one pair of bonding portions 17 is located is not limited thereto.

Subsequently, as shown in FIG. 16, the film heater 80a is rolled in a tube shape so that the metal thin plate 10 faces the inner surface, thereby overlapping the joints 17 located at both ends.

And, as shown in Figures 3 and 4, by bonding the overlapping junction 17 of the film heater dried in the form of a tube, it is possible to obtain the heater 80 according to the first embodiment. An ultrasonic or laser welding method may be used as the bonding method. In the laser welding method, a yag laser, a fiber laser, a femto laser, and the like can be used.

Although not shown, a cable for supplying power is bonded to the electrode pad 31 exposed outside the cover layer 50. Plating may be performed on the surface of the electrode pad 31 to ensure stable bonding with a power supply cable and good electrical conductivity. Copper, nickel, gold, and the like may be used as the plating material.

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

On the other hand, in the manufacturing method of the heater 80 according to the first embodiment, an example of manufacturing one heater 80 using the metal thin plate 10 is disclosed, but is not limited thereto. As shown in FIG. 17, a plurality of heaters may be collectively manufactured using the metal thin strip 19.

Referring to FIG. 17, the metal thin plate strip 19 includes arrayed unit metal thin plates 10, and includes unit film heaters 80a having electrode wiring patterns 30 formed on the unit metal thin plates 10, respectively. .

In the manufacturing method of the heater 80 according to the first embodiment, an example of forming an electrode wiring pattern 30 using photolithography using metal foil is disclosed, but 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.

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

Since the material used in the heating element composition may be used as a mixed binder, carbon nanotube particles and graphite particles contained in the conductive particles, an organic solvent, and a dispersant, 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 a flake shape, a spherical shape, a polygonal plate shape, or a rod shape.

The silver powder may be 50 to 80 parts by weight based on 100 parts by weight of the metal paste. Here, if it is 50 parts by weight or less, the electrical network between the silver powders is not formed, and thus the resistance is high, and when it exceeds 80 parts by weight, durability against stress is lowered, and a problem that costs increase may occur.

And 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 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]

Meanwhile, in the first embodiment, an example in which the metal thin plate 10 is formed to be located inside is disclosed, but the present invention is not limited thereto. For example, as shown in FIGS. 18 and 19, the metal thin plate 10 may be formed to be located outside.

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.

18 and 19, the heater 180 according to the second embodiment has a structure in which the metal thin plate 10 is located outside and the cover layer 50 is located inside. That is, in the heater 180 according to the second embodiment, an insulating layer 20, an electrode wiring pattern 30, a plurality of planar heating elements 40, and a cover layer 50 are sequentially on the inner surface of the metal thin plate 10. It has a stacked structure. Here, the inner surface of the metal thin plate 10 is the upper surface 13.

[Third Example]

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

Referring to FIG. 20, the heater 280 according to the third embodiment has a structure in which the metal thin plate 10 is located inside and the cover layer 50 is located outside, and the heat insulating layer 70 is disposed on the cover layer 50. ) Has a formed structure. 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 planar heating elements, a cover layer 50 and an insulating layer 70 are sequentially stacked on the outer surface of the metal thin plate 10. Have

At this time, since the structure in which the insulating layer 20, the electrode wiring pattern, the plurality of planar heating 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, detailed description will be omitted. .

The heat insulating layer 70 suppresses heat generated from the planar heating element and is discharged to the outside through the cover layer 50 and is lost. As the material of the heat insulating layer 70, a plastic material having heat resistance and electrical insulation or porous silicon may be used. For example, as a material of the insulating layer 70, a silicone tube having an air layer therein, porous silicone, perfluoroalkoxy (PFA), aramid fiber, or the like may be used, but is not limited thereto.

In this way, the heater 280 according to the third embodiment can suppress the heat generated by the planar heating element from being discharged and lost to the outside by forming the heat insulating layer 70 on the outer surface. In addition, the heat insulating layer 70 allows heat to be transferred toward the solid cigarette is inserted, thereby shortening the time for heating the solid cigarette and further reducing power consumption.

On the other hand, when the temperature sensor is formed on the cover layer 50, the cover layer 50 may be covered by the heat insulating layer 70 or partially exposed to the outside.

[Example 4]

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

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

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

The pair of electrode pads 31 are formed to be spaced apart at regular intervals. The pair of connection wires 33 are respectively connected to the pair of electrode pads 31 and extend in one direction. In addition, the plurality of electrode terminals 35 are respectively connected to a pair of connection wires 33 and extend toward the connection wires 33 facing each other. A plurality of planar heating elements 40 are connected to a pair of electrode terminals 35 connected to a pair of connection wires 33. In the fourth embodiment, an example in which four planar heating elements 40 are formed on a pair of electrode terminals 35 is disclosed, but is not limited thereto.

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

The pair of electrode pads 31 are formed to be spaced apart from the plurality of planar heating elements 40. In the first embodiment, an example in which a pair of electrode pads 31 are formed at a position spaced apart from the planar heating element 40 located at the outermost side in a direction in which a plurality of planar heating elements 40 are arranged is disclosed. It is not limited.

The pair of connecting wires 33 are respectively connected to corresponding electrode pads 31 and are formed outside the plurality of planar heating elements 40 along a direction in which the plurality of planar heating elements 40 are arranged. The pair of connection wires 33 includes a first connection wire 33a connected to the first electrode pad and a second connection wire 33b connected to the second electrode pad, and the first and second connection wires A plurality of planar heating elements 40 are positioned between (33a, 33b). The first and second connection wires 33a and 33b may be formed in a straight line shape parallel to each other.

In addition, the plurality of electrode terminals 35 are respectively connected to a pair of connection wires 33. The plurality of electrode terminals 35 includes a plurality of first electrode terminals 35a connected to the first connection wire 33a and a plurality of second electrode terminals 35b connected to the second connection wire 33b. do. The plurality of first electrode terminals 35a are formed toward the second connection wiring 33b, but are spaced apart from the second connection wiring 33b. The plurality of second electrode terminals 35b are formed toward the first connection wiring 33a, but are spaced apart from the first connection wiring 33a.

The planar heating element 40 is formed so as to connect the first electrode terminals 35a and the second electrode terminals 35b in pairs and connect the first and second electrode terminals 35a and 35b. The first and second electrode terminals 35a and 35b are formed parallel to each other and may be formed perpendicular to the connected first and second connection wires 33a and 33b.

In addition, when the first and second connection wires 33a and 33b are formed in parallel with each other, a plurality of planar heating 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 to 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 the parallel connection is to suppress the occurrence of voltage drop in the process of applying power to the plurality of planar heating elements 40 through the electrode wiring pattern 30.

The plurality of planar heating elements 40 is formed long in the direction in which the film heater 380a is dried in a tube shape. That is, the plurality of planar heating elements 40 are formed in a direction in which the first and second connecting wires 33a and 33b are formed. By forming the plurality of planar heating elements 40 as described above, when the plate-shaped film heater 380a is rolled into a tube shape, the contact area between the planar heating element 40 and the metal thin plate 10 can be increased, and the film heater 380a ) To stably bend when rolled in the form of a tube.

Of course, the plurality of planar heating elements 40 may be formed to have a curved portion in an intermediate portion 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, the heating element composition was prepared as follows. Carbon nanotubes and graphite particles were added to a carbitol acetate solvent and a dispersant was added to prepare a carbon nanotube / graphite dispersion (Solution A) through ultrasonic treatment for 60 minutes. Epoxy acrylate, phenol resin, and polyvinyl acetal resin are mixed and added to a carbitol acetate solvent to prepare a master batch (M / B) through mechanical stirring or mechanical kneading capable of rotating. Did. And after kneading Solution A and M / B through physical agitation, a heating element composition was prepared by completely kneading using a 3-roll mill.

Using the heating element composition prepared by the above-described manufacturing method, as shown in FIGS. 22 to 24, sample heaters were prepared. 22 is a photograph showing the film heaters 380a according to the fourth embodiment formed on the metal thin strip 19 before punching. FIG. 23 is a photograph showing the upper surface of the sample # 5 film heater 380a after the punching in FIG. 22. And Figure 24 is a photograph showing the lower surface of the sample 5 film heater 380a of Figure 23.

Referring to FIG. 22, the heaters 380a of Samples 1 to 9 according to the fourth embodiment may be collectively manufactured using the metal thin strip 19.

That is, first, a polyimide or a high heat-resistant insulating ink is cast on a metal thin plate strip 19 of 0.025 to 0.03 mm thick SUS material, and then dried and thermally cured to form an insulating layer 20. Next, a metal layer of brass is formed on the insulating layer 20. Next, an electrode wiring pattern 30 is formed by patterning the metal layer by a photolithography process. Next, after screen printing the heating element composition prepared by the above-described manufacturing method using a 250 mesh screen mask according to the electrode wiring pattern 30, after heat-curing the printed heating composition at 100 ° C to 180 ° C, 250 to Aging at 350 ° C. formed a plurality of planar heating elements 40. Then, the cover layer 50 is hot pressed onto the insulating layer 20 on which the electrode wiring pattern 30 and the planar heating element 40 are formed to collectively manufacture a plurality of film heaters 380a on the metal thin strip 19. Did.

And by punching the plurality of film heaters 380a in the metal thin plate strip 19, as shown in FIGS. 23 and 24, individual film heaters 380a can be obtained. Here, the individual film heaters 380a illustrated in FIGS. 23 and 24 are the film heaters 380a of Sample No. 5.

Subsequently, the individual film heaters 380a are rolled in a tube shape so that the metal thin plate 10 faces the inner surface so as to overlap the joints 17 located at both ends.

Then, the overlapped joints 17 of the film heater 380a dried in the form of a tube were joined with a fiber laser to prepare heaters 1 to 9 of the samples. At this time, butt welding (butt welding) at a transfer speed of 20 mm / s to 30 mm / s with a power of 40 to 60 W using a fiber laser, thereby joining the overlapped joints 17 of the dried film heater 380 a in the form of a tube do.

25 is a graph showing the heating behavior when DC 2V is applied to heater No. 5 of the sample.

Referring to FIG. 25, the heating behavior of the metal thin 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 are shown. When DC 2V is applied, it can be seen that the metal thin plate is heated to 300 ° C at a rate of about 25 seconds.

Therefore, when applying the driving voltage of DC 2V or more to the heater of sample 5, it can be predicted that 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 measuring and calculating the heating and electrical characteristics when the driving voltages DC 2V and 3.7V are applied to the heaters of Samples 1 to 9.

Referring to Table 1, when DC 3.7V is applied, the heaters of Samples 1 to 9 are expected to generate heat at a high temperature of 500 ° C or higher. However, at high temperatures of 500 ° C. or higher, the heaters of Samples 1 to 9 are difficult to maintain durability and life, and the power consumption is also high at 8 W or more.

As described above, a heater having a heat density of 2 W / cm 2 or more per unit area, capable of generating heat of 500 ° C. or more at a driving voltage of DC 3.7 V, and having a power of 8 W or more cannot be driven without control.

Therefore, when DC 3.7V is applied to the heaters according to Samples 1 to 9, as shown in FIG. 26, temperature control through PWM control is required. 26 is a schematic diagram of PWM control of the heater of sample 5.

Referring to FIG. 26, a is a heating behavior profile when a driving voltage of less than 3.7 V DC is applied to heater No. 5, and a1 is PWM control while applying a driving voltage of less than 3.7 V DC to heater No. 5. This is the exothermic behavior profile performed.

b is an actual heating behavior profile when DC 3.7V is applied to sample 5 heater, and b1 is a heating behavior profile performed by PWM control while applying DC 3.7V to sample 5 heater.

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

After peak heating to 350 to 400 ° C initially using the fast heating speed of sample No. 5 heater, PWM control to maintain at 250 to 350 ° C, thereby controlling the solid cigarette inserted in the heater to 150 to 160 ° C It can be heated to.

When DC 3.7V is applied as the driving voltage, it takes less than 3 seconds to heat the peak at 350 to 400 ° C. And through the PWM control, by maintaining the heater at 250 to 350 ℃, it is possible to quickly heat the solid cigarette inserted into the heater to 150 to 160 ℃ within 10 seconds. Through this PWM control, it is possible to suppress the durability and lifespan of the heater due to the high heating value of the heater of sample 5 from being reduced.

When the driving voltages of the samples 1 to 9 are DC 2V and DC 3.7V, the power ratio is 3.4 to 4.8. The heaters of Samples 1 to 9 have a heat density of 2 W / cm 2 or more when a DC 3.7V driving voltage is applied.

On the other hand, the embodiments disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the invention. It is obvious to those skilled in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

10: Metal thin plate
11: lower surface
13: upper surface
17: joint
19: Metal sheet strip
20: insulating layer
30: electrode wiring pattern
31: electrode pad
33: connecting wiring
35: electrode terminal
39: metal layer
40: planar heating element
50: cover layer
51: Windows
70: insulating layer
80, 180, 280: Heater
80a, 380a: Film heater
81: insertion hole
83: inlet
90: electric heating smoking device
91: temperature sensor
93: control unit
95: solid cigarette
100: solid type electronic cigarette

Claims (10)

A metal thin plate of flexible material having a thickness of 1 mm or less that can be bent into a tube shape so that one end of the solid cigarette can be separated after insertion;
An insulating layer coated or cast on the thin metal plate;
An electrode wiring pattern formed by printing a metal layer or a metal paste on the insulating layer;
A plurality of planar heating elements formed by printing a heating element composition in the form of a coating comprising nano carbon particles and a mixed binder on the insulating layer, and electrically connected in parallel by the electrode wiring pattern; And
A cover layer covering the electrode wiring pattern formed on the insulating layer and the plurality of planar heating elements;
A heater for an electrically heated smoking device comprising a. According to claim 1,
The insulating layer is a plastic material or an insulating ink composition is coated or cast on the metal sheet, the heater for an electrically heated smoking device. According to claim 1,
The electrode wiring pattern includes at least one pair of electrode terminals,
The plurality of planar heating elements are arranged in a spaced apart space between the pair of electrode terminals, the heater for an electrically heated smoking device. The method of claim 3,
The plurality of planar heating elements are formed to have curved portions in spaced apart spaces between the pair of electrode terminals by thermal curing and aging after printing the heating element composition on the insulating layer. According to claim 4,
In the plurality of planar heating elements, the curved portion is in the form of a sine wave or wave pattern, an electric heater for a smoking device. The method of claim 3,
The distance of the spaced apart space between the pair of electrode terminals is determined based on the heat density and the applied voltage range of the plurality of planar heating elements, the heater for an electric heating type smoking device. According to claim 1,
The heater,
As a film heater on the sheet of the metal thin plate as a base layer, the insulating layer, the electrode wiring pattern and the plurality of planar heating elements are thinly laminated,
The heater for an electric heating type smoking device increases the heating efficiency by widening the contact area with the solid type cigarette to which the film heater is rolled and inserted into a tube shape so that one end of the solid type cigarette can be inserted and contacted. A heater including a plurality of planar heating elements based on nanocarbon particles, and having a temperature raising characteristic that instantaneously generates a high heating value of 500 ° C. or more at a low voltage of 3 to 4 V;
A temperature sensor formed on one surface of the heater and measuring the temperature of the heater and transmitting it to a control unit; And
Includes a control unit for controlling the temperature of the heater based on the received temperature information;
The heater,
A metal thin plate of flexible material having a thickness of 1 mm or less that can be bent into a tube shape so that one end of the solid cigarette can be separated after insertion;
An insulating layer coated or cast on the thin metal plate;
An electrode wiring pattern formed by printing a metal layer or a metal paste on the insulating layer;
A plurality of planar heating elements formed by printing a heating element composition in the form of a coating comprising nano carbon particles and a mixed binder on the insulating layer, and electrically connected in parallel by the electrode wiring pattern; And
A cover layer covering the electrode wiring pattern formed on the insulating layer and the plurality of planar heating elements;
Including, electric heating smoking device. The method of claim 8,
The controller controls the heater to maintain a predetermined temperature range by automatically turning on / off the heater through PWM (Pulse Width Modulation) control after peak heating the heater temperature for a few seconds when a driving voltage is applied. , Electric heated smoking device. The method of claim 9,
The PWM control is a method of changing the duty ratio of the pulse according to the amplitude of the modulated signal, an electric heating smoking device.

Images