KR20120122323A - heating vessel for induction range and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A heating vessel for an induction range and a manufacturing method thereof are provided to prevent the damage of guide heating layer by forming the guide heating layer in the heating vessel. CONSTITUTION: A heating vessel(10) for an induction range comprises a vessel body(15) and a transfer coating part(20). The vessel body stores heated materials. The transfer coating part is formed on the bottom portion of the vessel body. The transfer coating part contains a guide heating layer and a protection layer(31). The guide heating layer is formed to contain silver paste. The protection layer protects the guide heating layer.

Description

Heating vessel for induction stove and manufacturing method thereof

The present invention relates to a heating container for an induction stove and a method of manufacturing the same, and more particularly, a heating container for an induction stove that can maximize thermal efficiency by directly attaching a transfer paper to an inner bottom surface of the container and directly heating the contents of the container. It relates to a manufacturing method thereof.

Induction range (Induction Range) is recently used as a kitchen heater refers to a cooking apparatus of the induction heater (IH method), IH method refers to an electromagnetic induction heating cooking apparatus.

This induction stove uses the principle that when a high voltage is applied to the coil under the top plate, a magnetic field is induced around the coil, and when the magnetic field passes through the bottom of the cooking vessel within the influence of the magnetic field, the metal contained in the material of the container is heated. .

Since the induction stove only heats the metal body, induction heating takes place where only the contents of the metal body become hot without heating the top of the stove. Therefore, when the container is lifted out of the influence of the magnetic field of the induction stove, the heating of the cooking vessel immediately stops, energy is generated only in the area where the container touches the energy efficiency is high.

Induction stoves do not generate any sparks, so there is no risk of fire, and because they do not burn fuels such as gas, there is no generation of combustion gas containing carbon monoxide. In particular, the induction stove is a kitchen heater that can be used very safely because the induction stove only heats the container in contact with the metal plate and thus does not cause burns even when touching the top plate.

In order to cook food using the induction stove described above, since the cooking vessel itself must contain iron (Fe) so as to be inductively heated by the magnetic field generated by the induction stove, the nonferrous metal corresponds to aluminum or nonmetal. In the case of heat-resistant glass and ceramics, that is, a ceramic cooking vessel, there was a problem that its use is impossible.

Therefore, in order to solve this problem, a separate metal sensitive plate is attached to the bottom of the cooking vessel, forming a recessed groove in the bottom bottom of the cooking vessel and inserting a metal sensitive plate in the recessed groove or the bottom of the bottom of the cooking vessel. By attaching the induction plate formed on the projection, there was a problem that the groove between the inlet groove and the induction plate of the cooking vessel is not firmly bonded or easily falls as the thermal expansion coefficient is different as a different material. In addition, the weight of the sensitive plate is not only heavy and beautiful appearance, there is a problem in that it is difficult to attach the sensitive plate in the case of ceramic cooking containers such as heat-resistant glass and ceramics.

Korean Unexamined Patent Publication No. 2010-0079963 discloses an induction container with a transfer film for induction heating and a method of manufacturing the same. The document discloses a technique of forming a thermally conductive layer by coating a transfer film on the bottom of a nonmagnetic container.

However, when the thermal conductive layer is formed on the outer bottom surface of the container as described above, there are the following problems.

First, when the heat conduction layer is heated by the magnetic field generated by the induction stove, the heat generated in the heat conduction layer does not directly heat the contents of the container but heats the bottom of the container to indirectly heat the contents. Therefore, the cooking takes a lot of time, there is a problem that the thermal efficiency is low.

Second, if the thermal shock strength of the thermal conductive layer is not excellent, there is a problem in durability (cracking / breakage), and heating traces remain in the thermal conductive layer when used in a direct heat source.

The present invention has been made to improve the above problems, by attaching a transfer paper to the inner bottom surface of the container to provide a heating container for an induction stove that can maximize the thermal efficiency by directly heating the contents inside the container and its manufacturing method Its purpose is to.

Induction stove heating container of the present invention for achieving the above object and the container body that can accommodate the contents to be heated; And a transfer coating part formed on the inner bottom surface of the container body so as to be in contact with the contents and heated by a magnetic field generated in an induction stove.

The transfer coating part is characterized in that the induction heating layer formed by applying a silver paste containing silver, and a protective layer formed on the induction heating layer to protect the induction heating layer sequentially formed on the bottom surface.

The protective layer includes a ceramic layer formed by applying a ceramic paste containing an inorganic pigment on top of the induction heating layer, and a decoration layer formed by applying a decoration paste containing an inorganic pigment on top of the ceramic layer. It is done.

The induction heating layer comprises a first layer formed by applying the silver paste, a second layer formed by applying the silver paste on top of the first layer after drying the first layer, and after drying the second layer. Characterized in that the third layer formed by applying the silver paste on the upper portion of the second layer.

And the manufacturing method of the heating container for induction stove of the present invention for achieving the above object comprises the steps of preparing a transfer sheet; Attaching the transfer paper to an inner bottom surface of the container body in which the contents are received so that the transfer paper can contact the contents to be heated; And heat-treating the container body to form the transfer coating part heated by the magnetic field generated by the induction stove by transferring the transfer paper to the container body.

The preparing of the transfer paper may include applying a silver paste containing silver and iron to the upper portion of the earth and drying to form an induction heating layer, and applying a ceramic paste containing an inorganic pigment on the upper portion of the induction heating layer. And drying to form a ceramic layer protecting the induction heating layer, and applying a decoration paste containing an inorganic pigment on top of the ceramic layer, followed by drying to form a decoration layer. .

The forming of the induction heating layer may be performed by printing the silver paste on the upper surface of the sheet by a silkscreen method and drying the first layer to form a first layer on the upper surface of the first layer. Printing and drying to form a second layer, and printing the silver paste on the top of the second layer by a silkscreen method, followed by drying to form a third layer.

As described above, in the present invention, the transfer paper is attached to the inner bottom surface of the heating container to form an induction heating layer so that the heating container is heated to cook the contents directly instead of cooking the contents inside the container. Therefore, the cooking speed is fast and can maximize the thermal efficiency.

In addition, breakage of the induction heating layer can be prevented by forming the induction heating layer inside the heating container without forming the outside. In addition, the heating vessel may be used for a heat source of direct fire, in which case it has the advantage that no heating traces remain in the induction heating layer.

In addition, the induction heating layer has a silver content of 50 to 75% by weight, which is very high in far infrared radiation and antibacterial effect. In addition, the decoration layer using the inorganic ceramic pigment is finally formed on the top to solve the problem of discoloration in use in the conventional transfer paper using the silver paste or the method of baking by directly coating the silver paste.

1 is a partially cutaway perspective view showing a heating container according to an embodiment of the present invention,
2 is a block diagram showing a method for manufacturing the heating vessel of FIG.
3 is a cross-sectional view showing the transfer paper attached to the heating vessel of FIG.
Figure 4 is a photograph showing a heating vessel according to another embodiment of the present invention,
5 and 6 is a photograph showing the antimicrobial test results,
7 is a test report showing the results of the component analysis,
8 is a photograph showing a heating vessel of a comparative example,
10 is a photograph showing a heating vessel of the embodiment.

Hereinafter, a heating container for an induction stove according to a preferred embodiment of the present invention and a manufacturing method thereof will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, another heating container 10 according to an embodiment of the present invention includes a container main body 15 and a transfer coating part 20.

The container body 15 has a receiving space in which contents to be heated can be accommodated, and is formed in a cylindrical shape with an open top. The container body 15 may be formed in various shapes as long as the container body 15 has a structure capable of accommodating contents therein. An open upper portion of the container body 15 may be coupled to the lid 90 when cooking.

In the present invention, the container body 15 may be formed of a nonmetal material such as ceramic, glass, or stone, and a nonmagnetic material such as copper, aluminum, or stainless steel.

The transfer coating unit 20 is formed in the container body 15 to be induction heated by a magnetic field generated in the induction stove to heat the contents. The transfer coating unit 20 may be formed in the container body 15 in various ways, but is preferably formed by transfer coating using a transfer paper.

In the present invention, the transfer coating part 20 is formed on the inner bottom surface 17 of the container body 15. As described above, the transfer coating part 20 is not formed outside the container main body 15, but is formed inside the container main body 15 so that the contents contained inside the container main body 15 can be directly heated. Therefore, the contents can be heated quickly without wasting energy, so the cooking speed is fast and thermal efficiency can be improved.

The transfer coating part 20 includes an induction heating layer 21 formed by applying a silver paste containing silver (Ag), and a protective layer 31 protecting the induction heating layer 21 sequentially from the bottom surface 17. Is formed.

The induction heating layer 21 is formed directly on the bottom surface 17 of the container body 15. Silver contained in the induction heating layer 21 has far infrared and antibacterial effects. Induction heating layer may be formed to a thickness of 7 to 9㎛. This thickness is a range that can bring about optimum efficiency for cost. Various methods may be applied as a coating method. For example, the silk screen method is used.

One example of the silver paste is 50 to 75 wt% silver, 5 to 20 wt% butyl lactate, 5 to 20 wt% glass frits, P-ment-1-en-8-ol (p -menth-1-en-8-ol) 1 to 5% by weight, silicon oxide 1 to 5%, boron oxide 1 to 5% by weight. Another example of the silver paste may be formed by mixing 50 to 75% by weight of silver and 25 to 50% by weight of iron and a conventional transfer oil in a weight ratio of 10: 6. Dibutyl phthalate (Dibutyl Phthalate) may be applied as a transfer oil.

The induction heating layer 21 may be formed of one single layer or a plurality of layers. In the illustrated example, the induction heating layer 21 is formed of three layers. For example, the first layer 23 formed by applying silver paste, the second layer 25 formed by applying silver paste on top of the first layer 23, and the silver paste on top of the second layer 25. It consists of the 3rd layer 27 formed by apply | coating. Thus, three times thin silkscreen printing induction heating layer having a thickness of 7 to 9㎛ can be uniformly formed over the entire area.

The protective layer 31 is formed on the induction heating layer 21 to protect the induction heating layer 21 from the outside. In particular, the protective layer prevents discoloration of silver contained in the induction heating layer by heating. The protective layer 31 is coated with a ceramic paste containing an inorganic pigment on top of the induction heating layer 21 and a decorative paste containing an inorganic pigment on top of the ceramic layer 33. It is provided with a decoration layer 35 formed.

The ceramic paste for forming the ceramic layer 33 is formed by mixing an inorganic pigment with a conventional transfer oil. For example, 20 to 40 wt% graphite, 10 to 30 wt% silicon oxide, and 30 to 50 wt% transfer oil. In the present invention, the ceramic paste is preferably a lead-free pigment, that is, a pigment containing no lead. The ceramic layer 33 protects the induction heating layer 21 to prevent scratches. The ceramic layer 33 may be formed to a thickness of 1㎛ using a silk screen method.

And the decoration paste for forming the decoration layer 35 is 35 to 45% of inorganic pigments such as silicon oxide or zinc oxide, 1 to 15% methyl methoxy butanol, 30 to 45% acrylic resin, And 1 to 15% of a transfer oil and 5 to 10% by weight of P-ment-1-en-8-ol. In the present invention, the decoration paste is preferably a lead-free pigment, that is, a pigment containing no lead.

The decoration layer 35 may be formed in various patterns to create a beautiful appearance of the transfer coating part 20. In addition, the decoration layer 35 is further formed on the ceramic layer to prevent discoloration. The decoration layer 35 may be formed to a thickness of 2 ㎛ using a silk screen method.

On the other hand, Figure 4 shows a decoration layer 2 formed in a circular pattern inside the heating vessel (1).

Hereinafter, the method for manufacturing the above-described heating vessel will be described in detail.

1 to 3, a heating container manufacturing method according to an embodiment of the present invention includes a transfer paper preparation step, a container attaching step, bubble removal and drying step, and a heat treatment step.

First, prepare a transfer paper to be attached to the container body 15 through the transfer paper preparation step. A transfer paper for a conventional induction stove may be used as the transfer paper, but preferably, the induction heating layer 21 and the induction heating layer 21 formed on the base 41 and the base 41 as shown in FIG. 3. It is provided with a protective layer 31 formed thereon. The induction heating layer 21 is composed of the first layer 23, the second layer 25, and the third layer 27, and the protective layer 31 is made of the ceramic layer 33 and the decoration layer 35. . The induction heating layer 21 and the decoration layer 31 have the same structure as the transfer coating part of the above-described embodiment.

A transfer sheet having the above structure is prepared in the following manner.

A silver paste containing silver and iron is applied to the upper portion of the earth 41 and dried to form an induction heating layer 21. The board 41 is a conventional transfer paper which has a very good absorbency and can be printed thereon, and can be removed from the induction heating layer 21 by dissolving in water. The silver paste is composed of 68 to 80% by weight silver, 10 to 20% by weight iron, 10 to 20% by weight oil.

The silver paste is applied on the base 41 to form the induction heating layer 21. Various methods may be applied as a coating method. For example, the induction heating layer 21 may be formed in a specific pattern by using a silk screen method.

The induction heating layer 21 may be formed of three layers in which the first layer 23, the second layer 25, and the third layer 27 are sequentially stacked. In the block diagram of FIG. 2, a first induction heating layer means a first layer 23, a second induction heating layer means a second layer 25, and a third induction heating layer means a third layer 27.

In order to form the above-described induction heating layer 21 having a three-layer structure, a silver paste is printed on the sheet 41 using a 150mesh screen mesh to form a first layer 23. And the first drying is performed by drying for 6 to 8 hours at room temperature (20 ~ 25 ℃). After drying the first layer 23, the second layer 25 and the third layer 27 are formed in the same manner. That is, the silver paste is printed on the ground using a 150mesh screen mesh on the first layer 23 to form the second layer 25, and dried at room temperature (20-25 ° C.) for 6 to 8 hours for secondary drying. Perform Then, a silver paste is printed on the ground using a 150mesh screen mesh on the second layer 25 to form a third layer 27, and dried at room temperature (20-25 ° C.) for 6 to 8 hours to perform tertiary drying. Perform

As described above, after the induction heating layer 21 having the three-layer structure is formed, the protective layer 31 is formed on the induction heating layer 21.

In order to form a protective layer, the ceramic paste is formed on the third layer 27 to form the ceramic layer 33, and then dried at room temperature (20-25 ° C.) for 4 to 5 hours to perform quaternary drying. Then, the decoration paste is applied on the dried ceramic layer 33 to form the decoration layer 35, and then dried at room temperature (20-25 ° C.) for 8 to 10 hours to perform fifth drying. Since the ceramic paste and the decoration paste have been described above, a detailed description thereof will be omitted.

Finally, the transfer paper 40 formed up to the decoration layer is attached to the container body 15 in the container attaching step. The transfer paper 40 is attached to the inner bottom surface of the container body 15 to be in contact with the contents to be heated. Before attaching to the container body 15, the transfer paper 40 is immersed in water to dissolve the transfer paper 41 in water.

After attaching the transfer paper from which the earth 41 has been removed to the inner bottom surface 15 of the container main body 15, remove the air bubbles between the container main body 15 using a tool such as rubber spatula, and then room temperature (20-25 ° C.). ) For 4-6 hours.

After drying, the container body 15 is put into an electric furnace, and then heated to 700 to 800 ° C. for 80 to 120 minutes, so that the transfer coating part 20 has the bottom surface 17 of the container body 15 as shown in FIG. 1. The heating vessel 10 formed in the can be manufactured. The transfer coating unit 20 is heated by the magnetic field generated in the induction stove to directly heat the contents inside the container body 15.

Hereinafter, the present invention will be described through examples. However, the following examples are intended to illustrate the present invention in detail, and the scope of the present invention is not limited to the following examples.

(Example)

Silver paste was printed on the ground using a 150mesh screen mesh to form a first layer 23 and dried at 25 ° C. for 7 hours to form a first layer. In the same manner, the second layer and the third layer were formed sequentially. Next, the ceramic paste was applied on the third layer and dried at 25 ° C. for 6 hours to form a ceramic layer. The decorative paste was applied on the ceramic layer and then dried at 25 ° C. for 9 hours to prepare a transfer sheet.

The prepared transfer paper was immersed in water for 5 minutes to remove the land, and then attached to the inner bottom surface of the main body of the 1.5 liter porcelain container. By heating to prepare a heating vessel as shown in FIG.

(Comparative Example)

A heating vessel was manufactured in the same manner as in the above example, but the transfer paper was attached to the outer bottom surface of the container body.

Experimental Example 1 Antimicrobial Activity Test

Escherichia coli as a test strain to determine the antimicrobial activity coli ATCC 25922) and Pseudomonas aeruginosa ATCC 15422) was used to test the antimicrobial effect on the heating vessel of the example. The test was conducted by the Korea Far Infrared Association, and the test method was conducted according to KFIA-FI-1003. The bottom of the heating vessel of the above example was cut into vertical and horizontal sizes of 5 cm x 6 cm and used as a test sample.

The antibacterial test results for Escherichia coli and Pseudomonas aeruginosa are shown in Table 1 and FIGS. 1 and 2, respectively.

Test Items Sample classification Initial concentration (CFU / ml) Concentration after 24 hours (CFU / ml) Bacterial reduction rate (%) Escherichia coli
Blank 6.5 × 10 ⁴
3.1 × 10 ⁵ - Test Sample ≪ 1.0 x 10 ³ 99.9 P. aeruginosa
Blank 1.1 × 10 ⁵
4.8 × 10 ⁵ - Test Sample ≪ 1.0 x 10 ³ 99.9

Referring to Table 1 and Figures 1 and 2, for E. coli, the initial inoculated bacterial count was reduced to [<1.0 × 10 ³ CFU / mL] after 24 hours of treatment at 6.5 × 10 ⁴ CFU / mL. In addition, in the case of Pseudomonas aeruginosa, the initial inoculation bacterial count was decreased to [<1.0 × 10 ³ CFU / mL] after 24 hours treatment at 1.1 × 10 ⁵ CFU / mL. This is 99.9% or more of the antimicrobial activity, it can confirm the excellent antimicrobial power of the heating vessel of the present invention.

Experimental Example 2 Heavy Metal Detection Test

The heavy metal detection test for the heating vessel of the above embodiment was carried out. The test was commissioned by the Korea Institute of Ceramic Technology and was conducted according to KS L 1204: 2009. Test results are shown in Table 2 and FIG. 3.

Name of sample Item Result (mg / L) Test Analysis Method
Test Sample
Pb 0.07
KS L 1204: 2009
CD <0.01 As Not detected

Referring to Table 2, as a result of requesting the dissolution test of harmful substances Pb (lead), Cd (cadmium) and As (arsenic), it is not detected or is much less than the international standard detection level, so it is not suitable for use as a cookware. You can see that there is no.

Experimental Example 3 Heating Test

In order to examine the heating efficiency, a heating test was conducted using the heating vessel of the above embodiment and the heating vessel of the comparative example. After filling 500 ml of water inside the heating vessel, the time to reach the boiling point (100 ° C.) was checked using a 1800 W stove (IU31, TAIYO, China).

As a result of the test, it took 2 minutes and 48 seconds to reach the boiling point in the case of Example, while 6 minutes and 30 seconds in the Comparative Example. As such, when the heating induction layer is formed on the inner bottom, the cooking speed is faster than the case where the heating induction layer is formed on the outer bottom, and thus the thermal efficiency is much higher.

The heating vessel (Dura Ceram, SOA IC) and the heating vessel of the embodiment, in which the induction heating layer was formed on the outer bottom, were heated for 20 minutes using the above-mentioned stove. As shown in FIG. The bottom surface of the plate discolored and a heating trace remained. On the contrary, in the case of the embodiment, no trace of discoloration was left as shown in FIG. 9.

In the above, the present invention has been described with reference to the illustrated embodiment, which is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

10: heating container 15: container body
17: bottom surface 20: transfer coating
21: induction heating layer 31: protective layer
33: ceramic layer 35: decoration layer
40: Transfer Paper 41: Earth

Claims (7)

A container body capable of containing the contents to be heated;
And a transfer coating part formed on the inner bottom surface of the container body so as to be in contact with the contents and heated by a magnetic field generated by the induction stove. The induction heating layer formed by applying a silver paste containing silver and a protective layer formed on top of the induction heating layer to protect the induction heating layer are sequentially formed on the bottom surface. Heating container for induction stove, characterized in that. The decoration layer of claim 2, wherein the protective layer is formed by applying a ceramic paste containing an inorganic pigment on top of the induction heating layer, and a decoration paste containing an inorganic pigment on the ceramic layer. A heating container for an induction stove, comprising a layer. The method of claim 2, wherein the induction heating layer is a first layer formed by applying the silver paste, a second layer formed by applying the silver paste on top of the first layer after drying the first layer, And a third layer formed by applying the silver paste to the upper portion of the second layer after drying of the second layer. Preparing a transfer sheet;
Attaching the transfer paper to an inner bottom surface of the container body in which the contents are received so that the transfer paper can contact the contents to be heated;
And heat-treating the container body to form the transfer coating part heated by the magnetic field generated by the induction stove by transferring the transfer paper to the container body. The method of claim 5, wherein the preparing of the transfer paper comprises applying a silver paste containing silver and iron to the upper part of the earth and drying the induction heating layer to form an inorganic pigment on the upper part of the induction heating layer. Coating and drying the ceramic paste to form a ceramic layer protecting the induction heating layer, and coating and drying a decoration paste containing an inorganic pigment on top of the ceramic layer to form a decoration layer. Method for producing a heating container for an induction stove comprising a. The method of claim 6, wherein the forming of the induction heating layer comprises: printing the silver paste on the upper surface of the earth by a silkscreen method and drying the first paste to form a first layer; Printing the silver paste by the silkscreen method and then drying to form a second layer, and printing the silver paste on the top of the second layer by the silkscreen method and drying to form a third layer Method for producing a heating container for induction stove, characterized in that.

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