KR101067297B1 - Method for manufacturing cooking apparatus with semi-dry multilayered coating - Google Patents

Abstract

In order to economically improve the durability of the coating layer, the present invention comprises a first step of forming a primer coating layer and heat-dried above the oxide film layer formed on the inner surface of the main body of the cookware; Forming a first mid coating layer on the top surface of the primer coating layer and semi-drying the second coating layer; A third step of forming a second mid-coating layer on an upper surface of the first mid-coating layer and drying it by heating; And a fourth step of forming a top coating layer on the upper surface of the second mid-coating layer and heating and drying the same.

Description

Method for manufacturing cooking apparatus with semi-dry multilayered coating}

The present invention relates to a method for manufacturing a cookware, and more particularly, to provide a method for manufacturing a cookware having a semi-dry multi-layer coating layer economically improved durability of the coating layer.

In general, a cooking utensil is a container for cooking food such as a frying pan, a pot, etc., and its configuration is a bowl-shaped main body and a handle formed on one side or both sides or a detachable handle to facilitate handling of the main body. It consists of, coating a protective film layer to protect the surface of the cookware. In detail, Teflon of fluororesin series is most widely used as the protective coating layer coating liquid, and various kinds of coating liquids such as ceramics are used.

1 is a view showing a conventional cooking utensil.

Referring to FIG. 1, the cooking utensil 100 includes a main body and a handle 130 through which food is cooked, and a cooking surface so that the pressed time can be easily removed during washing while preventing the food from sticking to the main body. At least one protective film layer is formed on 110a).

In detail, in the related art, the protective coating layer is formed of a multilayer coating layer such as a primer coating layer, a mid coating layer, a top coating layer by melting a chemical composition such as a fluororesin. In addition, as buyers' demands for the design of the kitchen utensils are diversified, various attempts have been made to form the design of the cooking utensil surface, that is, the pattern coating layer. As an example of such an attempt, a pattern coating layer was formed on the outer surface of the midcoat layer using a transfer paper.

However, the protective coating layer of the conventional cooking utensils has to be frequently replaced with the cookware due to damage such as scratching or abrasion with long use. In particular, when the degree of damage is advanced to the primer coating layer, there is a problem that is harmful to the human body when the particles of the oxide film layer existing below it is exposed.

Thus, an attempt has been made to increase the thickness of each coating layer constituting the protective film layer, but in this case, there is a problem that the required amount of a chemical composition such as fluorine resin is significantly increased, thereby lowering the economic efficiency.

Furthermore, in the related art, the mid layer is generally formed to have a thickness of 10 μm or more. In this relatively thick coating layer, fine cracks are generated on the surface during curing due to a temperature difference between inside and outside, and thus the durability of the coating layer is rather high. There was a problem that is further degraded.

The present invention solves the above problems, when forming a protective film layer on the surface of the cookware, eliminating the cracks generated during curing due to the internal and external temperature difference of the relatively thick protective film layer, solved to provide a cookware with improved durability It is a task.

In addition, the object of the present invention is to provide a cooking utensil in which a three-dimensional patterned coating layer is formed in a more sophisticated pattern inside the protective film layer.

In order to solve the above problems, the present invention comprises a first step of forming a primer coating layer on the upper side of the oxide film layer formed on the inner surface of the cooking appliance and heat-dried; A second step of forming a first mid-coating layer including a fluororesin dispersion liquid at a thickness of 2 to 5 μm on the upper surface of the primer coating layer and semi-drying at 180 to 220 ° C. for 5 to 10 minutes; A third step of forming a second mid-coating layer including a fluororesin dispersion in a thickness of 2 to 5 μm on an upper surface of the first mid-coating layer and heating and drying at 230 to 270 ° C. for at least 10 minutes; And a fourth step of forming a top coating layer on the top surface of the second mid-coating layer and heating and drying the fourth coating layer.

Here, the fourth step is preferably made, further comprising the step of pressing the bottom surface of the cooking utensil to 270 ~ 300 kgf / ㎡ after the heat drying of the top coating layer.

And, in any one of the second step and the third step, the magnetic force of the pattern set by the polarization line which is formed at the point where a plurality of magnets abut the coating of a resin mixed with nano-magnetic material particles, the lower portion of the main body By arranging the magnetic force generating means for providing a magnetic force to rearrange the nano-magnetic material particles along the set pattern by the magnetic force, the nano-magnetic particles are rearranged at a point corresponding to the polarization line is high in the polarization line The farther away the distribution density is, it is preferable to include the step of forming a three-dimensional ultra-thin pattern coating layer.

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Further, the second step and the third step is preferably formed by further comprising the step of forming a pattern coating layer containing a pigment after forming the first mid-coating layer.

The present invention provides the following effects through the above solution.

First, the present invention eliminates the minute crack phenomenon generated in the protective film layer by improving the fluidity and adhesive strength by coating the protective film layer applied to the oxide film layer of the cookware in a completely dry and semi-dry state to improve the fluidity and adhesion strength of the coating film interface Can be improved. Through this, the user can prevent the occurrence of harm to health or hygiene problems due to peeling of the oxide film or the protective film layer.

Second, by pressing the bottom layer on which the protective coating layer of the cooking utensil is formed, a protective coating layer having a high adhesive strength can be formed without thickening the protective coating layer. Through this, the cooking utensil protective film layer can be significantly reduced peeling phenomenon, it is possible to increase the durability of the cookware and significantly increase the life of the product.

Third, in addition to improving durability of the cookware, a three-dimensional patterned pattern formed by magnetic particles may be formed in multiple stages in the first and second mid-coated layers formed in multiple stages, thereby providing a more refined aesthetics of the pattern.

1 is a perspective view showing a conventional cooking utensil.
Figure 2 is a perspective view of a cookware having a semi-dry multilayer coating layer according to an embodiment of the present invention.
Figure 3 is a cross-sectional view of the main part of the cooking appliance with a semi-dry multilayer coating layer according to an embodiment of the present invention.
Figure 4 is a flow chart illustrating a method of manufacturing a cookware having a semi-dry multilayer coating layer according to an embodiment of the present invention.
Figure 5 is a flow chart showing a method of manufacturing a cookware having a semi-dry multilayer coating layer according to another embodiment of the present invention.
6 is a cross-sectional view of a cooking utensil having an ultra-thin pattern coating layer and a semi-dry multi-layer coating layer stereoscopically formed by a nanomagnetic material according to another embodiment of the present invention.
FIG. 7 is a perspective view illustrating a manufacturing process of a cooking utensil having an ultra-thin pattern coating layer and a semi-dry multilayer coating layer stereoscopically formed by a nanomagnetic material according to another embodiment of the present invention. FIG.
8A and 8B are photographs showing the appearance of a cooking utensil having an ultra-thin pattern coating layer and a semi-dry multilayer coating layer stereoscopically formed by a nanomagnetic material according to another embodiment of the present invention.

Hereinafter, a method of manufacturing a cookware according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The term "cooking utensil" used in the present invention includes all of the tools for cooking food that can be considered by a person of ordinary skill, such as a frying pan and various pots.

2 is a perspective view showing a cooking utensil provided with a semi-dry multilayer coating layer according to an embodiment of the present invention, Figure 3 is an enlarged cross-sectional view of a protective film layer formed on the cooking utensils according to an embodiment of the present invention.

2 and 3, the cooking appliance main body 10 according to the embodiment of the present invention includes an oxide film layer on the bottom of the main body 20 and a protective film layer 30a formed on the bottom surface of the main body. .

Here, the main body 20 is made of a container shape formed with an oxide film layer and a protective film layer (30a) on the inner surface so that food is accommodated, the lower surface is heated by a heating means, such as aluminum to stainless steel, such that the conductive heat is transferred smoothly It is made of material.

The main body 20 is placed on an upper surface of a heating means such as a gas range, a hot plate, an induction heater, or the like to cook food contained therein by heating the bottom surface thereof. . Here, the coating liquid constituting the protective film layer (30a) is made of a synthetic resin material, it may include any one of fluorine resin coating liquid, ceramic coating liquid, Teflon coating liquid, titanium coating liquid harmless to the human body. Among these, the protective film layer (30a) is preferably made of a coating layer mainly composed of fluororesin-based synthetic resin such as Teflon resin having a high inertness.

Meanwhile, the protective film layer 30a includes a primer coating layer 30, a first mid coating layer 40, a second mid coating layer 50, and a top coating layer 60.

Here, the primer coating layer 30 is a nmp soluble mixture of 14.8 to 16.8% by weight of polyamide, 3.1 to 5.1% by weight of water, 62.2 to 72.2% by weight of fluororesin dispersion, 2.5 to 4.5% by weight of carbon black dispersion, The composition ratio may include a silica dispersion of 7.4 to 9.4% by weight.

In addition, the composition ratio of the coating solution of the first mid coating layer 40 and the second mid coating layer 50 is 77.75 to 85.75% by weight of fluorine resin dispersion, 7.72 to 10.72% by weight of water, 2.14 to 4.14% by weight of aromatic hydrocarbon, Composition ratio containing 0.36 to 0.56 wt% triethylamine, 0.36 to 0.56 wt% oleic acid, 0.28 to 0.38 wt% surfactant, 2.35 to 4.35 wt% carbon black dispersion, and mica 1.04 to 2.04 wt% mica You can do At this time, the first mid coating layer 40 is applied after the complete drying of the primer coating layer 30, the second mid coating layer 50 is preferably applied after semi-drying of the first mid coating layer (40). .

In addition, the coating liquid composition ratio of the top coating layer 60 is 87.15 ~ 91.35% by weight of fluorine resin dispersion, 5.53 ~ 7.53% by weight of water, 0.79 ~ 1.39% by weight of aromatic hydrocarbon, 0.22 ~ 0.42% by weight of triethylamine, The composition ratio may include 0.22 to 0.42 wt% oleic acid, 0.15 to 0.35 wt% surfactant, and 1.74 to 2.74 wt% mica.

In detail, PTFE, which is used as a main material, has a structure in which all hydrogen atoms of polyethylene are substituted with fluorine atoms, and chemical bonds are much more stable than polyethylene.

 In addition, the carbon atom, which is the basic skeleton, is constrained by fluorine atoms with a large atomic radius, and thus the basic structure is not affected by severe conditions such as high temperature, high pressure, and chemicals. Can be considered to have Therefore, non-stickiness can be improved in the bottom layer of the cookware.

The non-stickt improved cookware is easy to clean because food does not stick to the bottom layer of the cookware and does not stick to water or oil even when heated, and in many cases, cleanliness is automatically maintained. In addition, since it shows nonstick even in a very thin coating film, it is desirable to form a protective film layer 30a that is thin and high in adhesive strength, if technically possible.

Thus, each coating layer of the protective film layer (30a) is preferably to change the composition and composition of each coating solution after addition of the fluororesin dispersion liquid as the main material according to the application purpose. That is, when food comes into contact with the boundary layer of the protective film layer 30a, the coating liquid of the top coating layer 60, which is the outer boundary surface, preferably contains a high proportion of fluorine resin dispersion so as not to stick.

On the other hand, the meaning of the complete drying and semi-drying may be represented as follows.

In detail, the adhesion of the polymer resin is one of the important phenomena in the surface chemistry of the polymer. In the adhesion of the coating layer, the mixed liquid state of the fluororesin is in a molten state and wetting occurs when it comes into contact with an object. The adhesive must first be applied to bond the material, but any type of adhesive is liquid at the time of application. The fluororesin mixture is fluid and fluid and can penetrate every corner of the adherend. The wet phenomenon occurs evenly on the interface of the adherend, and then enters the drying step.

Therefore, in the semi-dry state in which the coating layer applied to the adherend at a relatively low temperature and a short drying time by controlling the drying temperature and drying time is not yet completely hardened, and fluidity and adhesiveness remain on the surface thereof, The coating layer applied over the dry coating layer may be wetted on a semi-dry surface, and may be dried step by step in which the adherend and the adhesive are integrally fused to improve adhesion. When drying on the adhesive surface, the liquid adhesive may cause curing shrinkage, but the method of the present invention uses a method of applying the liquid resin to the upper side of the semi-dry coating layer, which is an adherend, and uses the viscosity and fluidity of the semi-dry state to form a liquid resin. And it can be made in a way to minimize the frictional forces that can be generated during curing shrinkage.

On the contrary, a state in which the coating layer applied to the adherend at a relatively high temperature and a long drying time is completely hardened and hardened so as to have no fluidity and adhesiveness can be regarded as a completely dry state.

According to the present invention, the coating layer applied to the upper surface of the semi-dry state may function as an adhesive and an adhesive due to the viscosity and adhesiveness of the semi-dry state.

Therefore, after semi-drying the first mid-coating layer 40 by dividing the semi-drying and the complete drying, the second mid-coating layer 50 is formed on the upper surface thereof. The micro cracks can remove elements that could reduce cookware's durability and lifespan in the long run. That is, the upper surface of the first mid coating layer 40 in the semi-dry state may simultaneously serve as an adhesive when the second mid coating layer 50 is applied.

In the case of forming the mid-coating layer in one layer as in the prior art, there is a problem in that durability occurs due to the occurrence of minute cracks on the surface due to the difference in temperature between the inside and outside of the thick thickness during drying and curing. However, the present invention is applied by dividing the mid coating layer into two to a thickness of 2 to 5 μm in a manner of dividing the mid coating layer into a semi-drying method of the first mid coating layer 40 and the complete drying method of the second mid coating layer 50. When the first mid coating layer 40 is in a semi-dry state, the second mid coating layer 50 is applied to the upper side of the landmark surface and completely dried.

As such, since the coating is divided into two, it is possible to eliminate the occurrence of minute cracks due to curing shrinkage and to improve durability to extend the life of the cookware.

In addition, the pattern coating layer may be formed on the top surface of the first mid coating layer 40 or the second mid coating layer 50. Semi-drying the first mid-coating layer 40 and a pattern coating layer is formed on the upper side, the color and the pattern can be of various designs. In this case, various methods may be selected in manufacturing, such as a method of forming a pattern coating layer by mixing and applying a pigment to a resin. Subsequently, the pattern coating layer is formed and a second mid coating layer is applied upward.

4 is a flowchart illustrating a method of manufacturing a cookware having a semi-dry multilayer coating layer according to an embodiment of the present invention.

As shown in FIG. 4, first, the oxide film layer formed on the main body is washed to remove contaminants, and the distance between molecules required for adhesion may be obtained in a micro state through physical modification of the surface (S210). ). Therefore, the adhesion strength between the oxide film layer and the primer coating layer can be significantly increased to increase durability.

In addition, it is preferable to make the inner bottom of the product flattened and smoothed through the sanding operation (S220). In general, sanding may be regarded as an operation of modifying the surface of an object to a state suitable for applying a paint or an adhesive. As such, it is preferable to enter the protective film layer after changing to a suitable state to form a coating layer on the oxide film layer.

Subsequently, the primer coating layer is formed on the surface of the oxide film layer and then completely dried (S230). Here, the primer coating layer is preferably formed of a coating layer on the upper side of the oxide film layer formed on the inner surface of the main body of the cookware to a thickness of 4 ~ 6 ㎛. In addition, when drying by heating completely, it is preferable that the cooking utensil on which the primer coating layer is formed is heated at a temperature of 200 ° C to 250 ° C for 10 minutes to 20 minutes to completely dry it.

In addition, after forming the first mid-coating layer on the surface of the completely dried primer coating layer is a step of semi-drying (S240). Here, the first mid coating layer preferably forms a coating layer with a thickness of 2 to 5 μm. In addition, it is preferable to semi-dry under the condition of heating the first mid coating layer applied to the upper surface of the primer coating layer on which the coating layer is previously formed at a temperature of 180 ° C. to 220 ° C. for 5 to 10 minutes when drying by heating.

Thereafter, a step of forming a second mid-coating layer on the surface of the semi-dried first mid-coating layer and then drying is performed (S300). Here, the second mid coating layer preferably forms a coating layer with a thickness of 2 to 5 μm. In addition, it is preferable to dry completely by heating the second mid-coating layer applied to the upper side of the first mid-coating layer on which the coating layer is previously formed at a temperature of 230 ° C. to 270 ° C. for 5 to 10 minutes when drying by heating.

Subsequently, after forming the top coating layer to the upper side of the surface of the second mid-coating layer has a step of completely drying (S245). Here, the top coating layer preferably forms a coating layer with a thickness of 4 ~ 6 ㎛. In addition, when drying by heating, the cooking utensil having the top coating layer formed above the second mid coating layer formed on the inner surface of the main body of the cooking utensil is heated at a temperature of 360 ° C. to 400 ° C. for 20 minutes to 30 minutes to completely dry it.

In addition, after completely drying the surface of the top coating layer, it is preferable to include a pressure press step of the bottom surface of the cookware to 270 ~ 300 kgf / ㎡. The pressing step can be seen as the bottom of the protective film layer. When the protective coating layer is pressed at a pressure of 270 to 300 kgf / m 2, the surface of the coating layer may be hardened and durability may be further improved. Through this, the adhesion strength to the surface boundary of each coating layer can be increased and also the effect of reducing the occurrence of fine cracks. In addition, since the bottom surface of the cooking utensil is subjected to the same force by the pressing step, it can be expected that the flattening of the bottom surface and the bottom surface become smoother.

In addition, the pressure press step eliminates air that may occur on the surfaces between the coating layers, and further widens the adhesive interface between the coating layers. Therefore, the pressing step can increase the adhesive strength between the coating layer consisting of a multi-layer structure and to extend the surface area of the adhesive can extend the durability and life of the product.

On the other hand, a pattern coating layer of a fluorine resin material containing a pigment may be formed on the upper side of the semi-drying the first mid-coating layer surface to the upper side of the second mid-coating layer.

5 is a flowchart illustrating a cookware protective coating layer according to another embodiment of the present invention. In this embodiment, since the basic configuration except for the configuration of forming the primer coating layer and the top coating layer in multiple stages after semi-drying is the same as the above-described embodiment, a description of the same parts will be omitted.

As shown in FIG. 5, the primer coating layer is semi-dried by forming a first primer coating layer in a thickness of 2 μm to 3 μm, and then completely drying by forming a second primer coating layer having a thickness of 2 μm to 3 μm. It can be broken down into (S330, S335). In this case, the first primer coating layer may be semi-dried for 10 minutes to 15 minutes at a temperature of 130 ℃ ~ 170 ℃, the second primer coating layer may be heated and dried for more than 10 minutes at a temperature of 230 ℃ to 270 ℃.

In addition, when the top coating, the first top coating layer is formed on the second mid-coated surface to have a thickness of 2 μm to 3 μm and semi-dried, and then the second top coating layer is formed to a thickness of 2 μm to 3 μm and then heated. It may be subdivided by a drying method (S350, S355). At this time, the first tower coating layer is semi-dry for 5 minutes to 10 minutes at a temperature of 130 ℃ ~ 170 ℃, the second tower coating layer is preferably heat-dried 20 minutes to 30 minutes at a temperature of 380 ℃ ~ 438 ℃. .

On the other hand, Figure 6 is a cross-sectional view showing a cooking utensil provided with an ultra-thin patterned coating layer and a semi-dry multi-layer coating layer three-dimensionally by a nano-magnetic material according to another embodiment of the present invention, Figure 7 is according to another embodiment of the present invention A perspective view showing a manufacturing process of a cooking utensil equipped with an ultra-thin pattern coating layer and a semi-dry multilayer coating layer stereoscopically formed by a nanomagnetic material, FIGS. 8A and 8B are ultra-thin patterns stereoscopically formed by a nanomagnetic material according to another embodiment of the present invention. It is a photograph showing the appearance of a cooking utensil provided with a coating layer and a semi-dry multilayer coating layer. Each coating layer in the present embodiment has the same basic configuration as the above-described embodiment, the description of the same parts will be omitted.

As shown in FIG. 6 and FIG. 8B, in the step of forming at least one portion of the first mid coating layer 40 and the second mid coating layer 50, a resin in which the nano magnetic particles 35 are mixed is coated, A magnetic force generating means 70 is provided below the main body 20 to provide a magnetic force of a pattern set by a polarization line 71 formed at a point where the plurality of magnets 70a abut. Accordingly, the nanomagnetic particles 35 are rearranged, but the distribution density of the nanomagnetic particles 35 rearranged at a point corresponding to the polarization line 71 is higher and the distribution density is lower as the polarization line is further away from the polarization line. It is preferable to include the step of forming a more sharply three-dimensional ultra-thin pattern coating layer.

Here, the nano-magnetic material particles 35 are slowly heated and inexpensive and non-toxic metals and surfactant complexes, and then further heated at a temperature of 300 degrees Celsius or more for a predetermined time, 12nm (nano, 1 nanometer in a few hours) It is preferable that it consists of uniform magnetic iron oxide nanoparticles produced as a particle size of 1 billion = 1 billion. Techniques for producing such nanomagnetic particles are disclosed in detail in US Pat. Nos. 4,206,094, 4,219,411, 4,4454,234, 4,863,715 and Korean Patent No. 967708.

6 and 7, in order to form at least one portion of the first mid coating layer 40 and the second mid coating layer 50, the first mid coating layer 40 to the second mid coating layer ( After the nanomagnetic particles 35 are contained in the molten resin forming the 50 and applied to the main body 20, the magnetic force generating means 70 is disposed above or below the main body 20, The nanomagnetic particles 35 may be rearranged along the set pattern to form a three-dimensional super-thin pattern coating layer. Furthermore, as shown in FIG. 6, the colors of the nanomagnetic particles mixed in the first mid coating layer 40 and the second mid coating layer 50 are formed different from each other to form an innovative and refined multi-dimensional three-dimensional ultra-thin pattern coating layer. can do. In addition, the nanomagnetic particles are formed to be distinguished from the color of each coating layer.

Here, the magnetic force generating means 70 is provided with a combination of a plurality of independent magnets (70a) to have a polarization line 71 of a set pattern, the point where the nanomagnetic particles 35 correspond to the polarization line In FIG. 8A and FIG. 8B, the rearranged distribution density is high and in the portion 37 away from the polarization line, the distribution density is lowered, thereby making it possible to form an ultra-thin pattern coating layer having a clear three-dimensional appearance and a clear difference in distribution density.

In detail, as shown in FIG. 7, in general, the polarization line 71 having the high magnetic force at its center point and the rearranged distribution density is higher and the distribution density is continuously lowered away from the polarization line 71 of the independent magnets 70a. It is formed at the point where the pole and the S pole abut. As described above, in the polarization line 71 formed at the point where the plurality of individual magnets 70a abuts, the magnetic forces of the two magnets are combined and amplified. In the polarization line 71, the magnetic force is significantly stronger than the magnetic force of a single magnet. To provide.

As a result, at a point corresponding to the polarization line 71, the rearranged distribution density of the nano-magnetic material particles 35 is high, and as the distance from the polarization line 71 increases, the distribution density is lowered, resulting in a sharp three-dimensional appearance and a difference in distribution density. Can form remarkably clear three-dimensionalized patterns. That is, even though the overall thickness of the coating layer is limited to within several tens of micrometers, the nanoparticle particles 35 may be rearranged by the rearranger because the nanostereous particles 35 may be stereoscopically shaped as the shade of the light is changed depending on the viewing angle. Areas that are concentrated in distribution can be visually provided with a clear three-dimensional appearance, thereby providing a new high quality appearance.

In other words, the area in which the nanomagnetic particles 35 are concentrated is rearranged by magnetic force, and since the distribution density change is continuous, the reflectance of the light projected on the nanomagnetic particles 35 is changed continuously. As a result, a more realistic and natural three-dimensional feeling such as intaglio or embossing can be provided.

As described above, the present invention is not limited to the above-described embodiments, but may be modified and implemented by those skilled in the art without departing from the scope of the claims of the present invention. Such modifications are within the scope of the present invention.

20: main body 30: primer coating layer
35: nanomagnetic particles 40: first mid coating layer
50: second mid coating layer 60: top coating layer
70: magnetic force generating means 71: polarization line

Claims (5)

A first step of forming a primer coating layer over the oxide film layer formed on the inner surface of the main body of the cooker and heating and drying the primer coating layer;
A second step of forming a first mid-coating layer including a fluororesin dispersion liquid at a thickness of 2 to 5 μm on the upper surface of the primer coating layer and semi-drying at 180 to 220 ° C. for 5 to 10 minutes;
A third step of forming a second mid-coating layer including a fluororesin dispersion in a thickness of 2 to 5 μm on an upper surface of the first mid-coating layer and heating and drying at 230 to 270 ° C. for at least 10 minutes; And
A method of manufacturing a cookware having a semi-dry multilayer coating layer comprising a fourth step of forming a top coating layer on a top surface of the second mid coating layer and heating and drying the fourth coating layer. The method of claim 1,
The fourth step of the cooking utensil having a semi-dry multilayer coating layer further comprises the step of pressing the bottom surface of the cookware to 270 ~ 300 kgf / ㎡ after the heat drying of the top coating layer. Manufacturing method. delete The method of claim 1,
At least one of the second and third steps may be performed by applying a resin in which nanomagnetic particles are mixed, and applying a magnetic force of a pattern set by a polarization line formed at a point where a plurality of magnets contact a lower portion of the main body. By arranging the magnetic force generating means to provide rearrangement of the nano-magnetic material particles along the set pattern by the magnetic force,
The nanomagnetic particles are rearranged at a point corresponding to the polarization line has a high distribution density and the farther away from the polarization line, the distribution density is lowered, thereby forming a three-dimensional ultra-thin pattern coating layer comprising the Method for producing a cookware having a dry multilayer coating layer. The method of claim 1,
The second step and the third step is a method for producing a cooking utensil with a semi-dry multi-layer coating layer further comprises the step of forming a pattern coating layer containing a pigment after forming the first mid coating layer.

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