KR20200112464A - Method for manufacturing a cooking vessel in which a coating layer is formed - Google Patents

Abstract

The present invention relates to a method for manufacturing cooking equipment with a coating layer, having strengthened durability by a mechanical method. The method comprises: a substrate processing step; a coating layer forming step; a coating layer compression step; and a container body forming step of performing drawing on at least a part of a substrate of which a coating layer is formed on at least one surface so as to form a cooking container body. The substrate of which the coating layer is formed on at least one surface is manufactured in a way that in the coating layer compression step, the coating layer formed to have a first thickness on the substrate in the coating layer forming step of spraying a coating solution onto the one surface of the substrate is compressed, such that the coating layer is compressed into a second thickness that is smaller than the first thickness.

Description

Method for manufacturing a cooking vessel in which a coating layer is formed}

The present invention relates to a method of manufacturing a cooking utensil with a coating layer, and more particularly, to a manufacturing method of a cooking utensil with a coating layer having enhanced durability by a mechanical method.

A cooking utensil is a container for cooking food, such as a frying pan, a pot, etc., and its configuration is a bowl-shaped cooking container body and a handle formed on one or both sides to facilitate handling of the cooking container body, or a detachable handle It can be made including. In general, cooking utensils may have at least one coating layer formed to protect the cooking surface of the cooking container body on which the food ingredients are cooked, prevent the food ingredients from sticking, and to easily remove the pressed dirt during washing. The coating layer is the most widely used fluororesin-based Teflon as a coating solution.

More specifically, the coating layer may be formed as a multi-layered coating layer such as a primer coating layer (primer), an intermediate coating layer (functional layer), and a top coating layer (protective layer) by melting a chemical composition such as a fluorine resin. However, the coating layer of the conventional cooking utensils has a problem in that the cooking utensils need to be frequently replaced because damage such as scratching or abrasion is easily caused by long use. In addition, when damage to the undercoat layer of the multilayered coating layer occurs, a metal material such as aluminum existing under the coating layer is exposed to the outside as it is, so that components harmful to the human body are leaked to the outside.

The present invention is to solve various problems including the above problems, and by enhancing the durability of the coating layer coated on the cooking utensil so that damage to the coating layer does not occur easily, the cooking surface of the cooking container body is made more robust. It is an object of the present invention to provide a method of manufacturing a cooking utensil in which a protective coating layer is formed. However, these problems are exemplary, and the scope of the present invention is not limited thereby.

According to an embodiment of the present invention, a method of manufacturing a cooking utensil in which a coating layer is formed is provided. The method of manufacturing a cooking utensil with a coating layer includes forming a cooking container body by drawing at least a portion of a substrate on which a coating layer is formed on at least one surface, wherein the coating layer is formed on at least one surface. The substrate is a coating layer pressing step of pressing the coating layer formed to have a first thickness on the substrate in a coating layer forming step of spraying a coating liquid onto one surface of the substrate to compress the coating layer to a second thickness thinner than the first thickness; It can be manufactured including.

According to an embodiment of the present invention, in the step of compressing the coating layer, the coating layer is pressed to the second thickness by sequentially pressing the entire surface of the substrate on which the coating layer is formed with the first thickness with a rotating first rolling roll. I can.

According to an embodiment of the present invention, in the step of compressing the coating layer, the entire other surface of the substrate is sequentially pressed with a second rolling roll formed to face the first rolling roll and rotated, thereby simultaneously pressing both sides of the substrate. The coating layer may be compressed to the second thickness.

According to an embodiment of the present invention, in the step of compressing the coating layer, the entire surface of the substrate on which the coating layer is formed with the first thickness may be simultaneously pressed to compress the coating layer to the second thickness.

According to an embodiment of the present invention, in the step of compressing the coating layer, the coating layer formed with the first thickness of 30 μm to 35 μm on one surface of the substrate may be compressed to the second thickness of 20 μm to 32 μm. .

According to an embodiment of the present invention, in the step of forming the container body, the cooking container body is formed of a cooking surface and an inner wall surface surrounding the cooking surface so as to accommodate the food to be cooked, and is concave downward. ) Can be formed in the shape.

According to an embodiment of the present invention, a coating layer recompression step of pressing the cooking surface and at least a portion of the inner wall surface of the cooking container body to secondarily compress the coating layer compressed to the second thickness to a third thickness. It may further include;

According to an embodiment of the present invention, in the step of recompressing the coating layer, press pressing or hydroforming using an elastic mold is performed to uniformly press the cooking surface and the inner wall surface formed inclined with respect to the cooking surface. The coating layer can be secondarily compressed by using.

According to an embodiment of the present invention, the substrate may include any one of aluminum, stainless steel, magnesium, and alloys thereof.

According to an embodiment of the present invention, the substrate may be a multilayer metal plate formed by cladding a stainless steel plate on one or both sides of an aluminum (Al) plate.

According to an embodiment of the present invention, the coating layer may include Teflon.

According to an embodiment of the present invention, the forming of the coating layer includes: a primer coating step of forming a primer coating layer on one surface of the substrate and drying by heating; An intermediate coating step of forming a Teflon coating layer containing a fluororesin dispersion on the upper surface of the primer coating layer and drying by heating; And forming a transparent clear coating layer on the upper surface of the Teflon coating layer and heating and drying the top coat layer.

According to an embodiment of the present invention, the intermediate coating step may include forming a first Teflon coating layer including a fluororesin dispersion on an upper surface of the primer coating layer and heating and drying a first Teflon layer; And forming a second Teflon coating layer including a fluorine resin dispersion on the upper surface of the first Teflon coating layer and heating and drying a second Teflon layer.

According to an embodiment of the present invention made as described above, by enhancing the durability of the coating layer coated on the cooking utensil so that damage to the coating layer does not occur easily, the effect of more firmly protecting the cooking surface of the cooking container body is obtained. Can have.

Accordingly, even if the cooking utensil is used for a long time, the coating layer firmly protects the cooking surface of the cooking container body and the function of the coating layer is maintained as it is, thereby preventing the food ingredients from sticking to the cooking surface. During washing, the pressed dirt can be easily removed, and a method of manufacturing a cooking utensil with a coating layer having an effect of preventing the leakage of harmful components to the human body by preventing the metal material under the coating layer from being exposed to the outside can be implemented. . Of course, the scope of the present invention is not limited by these effects.

1 is a flow chart showing a method of manufacturing a cooking utensil with a coating layer according to an embodiment of the present invention.
2 to 7 are cross-sectional views schematically showing each step of the method of manufacturing the cooking appliance in which the coating layer of FIG. 1 is formed.
8 is a perspective view schematically showing a cooking utensil manufactured by the method of manufacturing the cooking utensil having a coating layer of FIG. 1.
9 is an image showing a result of a wear resistance test of the coating layer formed on the cooking appliance of FIG. 8.

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

The embodiments of the present invention are provided to more completely describe the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows. It is not limited to the examples. Rather, these embodiments are provided to make the present disclosure more faithful and complete, and completely convey the spirit of the present invention to those skilled in the art. In addition, in the drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description.

Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically showing ideal embodiments of the present invention. In the drawings, for example, depending on manufacturing techniques and/or tolerances, variations of the illustrated shape can be expected. Accordingly, the embodiments of the inventive concept should not be construed as being limited to the specific shape of the region shown in the present specification, but should include, for example, a change in shape caused by manufacturing.

1 is a flow chart showing a method of manufacturing a cooking utensil with a coating layer according to an embodiment of the present invention, and FIGS. 2 to 7 are cross-sectional views schematically showing each step of the method of manufacturing a cooking utensil with a coating layer of FIG. 1 . In addition, FIG. 8 is a perspective view schematically illustrating a cooking appliance manufactured by the method of manufacturing a cooking appliance having a coating layer of FIG. 1, and FIG. 9 is an image showing a result of a wear resistance test of a coating layer formed on the cooking appliance of FIG. 8.

First, as shown in FIG. 1, a method of manufacturing a cooking appliance with a coating layer according to an embodiment of the present invention includes a substrate processing step (S10), a coating layer forming step (S20), and a coating layer pressing step (S30). And it may include a container body forming step (S40).

As shown in FIG. 2, the substrate processing step S10 may process the substrate 10 of the cooking container body 11 by blanking the metal plate S. For example, the metal plate S may be a multilayer metal plate formed by cladding a stainless steel plate on one or both sides of an aluminum (Al) plate.

More specifically, the metal plate (S) that can be processed into the cooking container body 11 in the container body forming step (S40) to be described later is heated by a heating means such as a gas range, a hot plate, or an induction heater. It may be made of a metal material such as aluminum or stainless steel so that conductive heat can be transferred smoothly. Such, the metal plate (S), made of a combination of the aluminum plate and the stainless plate, can have both the advantages of the aluminum having a high thermal conductivity and stainless steel having a high strength characteristics.

For example, a conventional cooking utensil made of a single aluminum plate has excellent thermal conductivity, but is weak in strength, so that its shape is easily deformed, and aluminum components are easily leaked to the outside, contaminating food materials, thereby affecting the human body. In addition, cooking utensils made of a single stainless steel plate have a disadvantage in that the food ingredients to be cooked are not evenly cooked due to low thermal conductivity.

However, the metal plate (S) of the present invention is made of a multilayer metal plate formed by cladding a stainless steel plate on one or both sides of an aluminum plate, so that the strength of the cooking utensils can be maintained and high thermal conductivity can be maintained. In addition, the metal plate S may be formed of a multi-layered metal layer of various materials such as copper (Cu), titanium (Ti), and iron (Fe) according to the strength or characteristics of the cooking utensil required in addition to the combination of aluminum and stainless steel.

Subsequently, as shown in FIG. 3, in the coating layer forming step S20, the coating layer 20 may be formed to have a first thickness H1 by spraying the coating liquid C on one surface of the substrate 10. More specifically, the coating layer forming step (S20) includes a primer coating step of forming a primer coating layer 21 on one surface of the substrate 10 and drying by heating, and a Teflon containing a fluorine resin dispersion on the upper surface of the primer coating layer 21. It may include an intermediate coating step of forming the coating layer 22 and drying by heating, and a top coat coating step of forming a transparent clear coating layer 23 on the upper surface of the Teflon coating layer 22 and drying by heating.

For example, the coating layer 20 may be formed by a coating solution C sprayed from at least one nozzle N, and the nozzle N may cover the entire surface of the substrate 10 while moving in the XY axis. (C) or a plurality of nozzles (N) is disposed in an area corresponding to the area of the substrate 10, it is possible to simultaneously spray the coating liquid (C) on the entire surface of the substrate 10. In this case, the substrate 10 may be rotated so that the coating solution C can be formed to have a uniform thickness on one surface of the substrate 10.

The coating layer 20 formed in the coating layer forming step (S20), as shown in FIG. 3, includes a primer coating layer 21 that increases the adhesion between the substrate 10 and the coating layer 20, and a Teflon coating layer 22 as a functional layer. ) And a clear coating layer 23 protecting the Teflon coating layer 22 may be formed as a third degree coating.

However, the coating layer 20 is not necessarily limited to the third degree coating, and the Teflon coating layer 22, which is a functional layer containing a fluororesin dispersion, is at least one Teflon layer according to the specifications or functions of the coating layer 20 required. Can be formed.

For example, the intermediate coating step includes forming a first Teflon coating layer including a fluorine resin dispersion on the upper surface of the primer coating layer 20 and heating and drying the first Teflon layer forming step, and a fluorine resin dispersion on the upper surface of the first Teflon coating layer. By including the step of forming a second Teflon layer including forming a second Teflon coating layer and drying by heating, the Teflon coating layer 22 may be formed of a plurality of Teflon layers. In this way, when the Teflon coating layer 22 is divided in two and coated, it is possible to prevent the occurrence of minute cracks due to curing shrinkage of the Teflon coating layer 22 and further improve the durability of the overall coating layer 20. .

In the Teflon coating layer 22 containing a fluororesin, carbon atoms, which are basic skeletons, are confined by fluorine atoms having a large atomic radius, so that the basic structure is not significantly affected even in harsh environments such as high temperature, high pressure, and chemicals. It can be considered to be the most chemically inert among polymer materials that exist in structure. Accordingly, nonstick properties may be improved on one surface of the substrate 10 on which the coating layer 20 including the Teflon coating layer 22 is formed.

Subsequently, as shown in FIG. 4, in the step of compressing the coating layer (S30), the coating layer 20 of the substrate 10 is pressed to a second thickness H2 that is thinner than the first thickness H1. Can be crimped. In this, the coating layer pressing step (S30), various processes capable of effectively pressing the coating layer 20 of the substrate 10 may be applied.

For example, as shown in Figure 4 (a), in the coating layer pressing step (S30), a first rolling roll rotating the entire surface of the substrate 10 on which the coating layer 20 is formed with a first thickness (H1) ( By sequentially pressing R1), the coating layer 20 may be compressed to a second thickness H2. In this case, although not shown, the other surface of the substrate 10 on which the coating layer 20 is not formed may be supported by a die formed in an area corresponding to the area of the substrate 10.

In addition, as shown in Figure 4 (b), in the coating layer pressing step (S30), the entire other surface of the substrate 10 is formed to face the first rolling roll (R1) and rotated by the second rolling roll (R2) ) By sequentially pressing both sides of the substrate 10 to simultaneously press the coating layer 20 to a second thickness H2. Therefore, by simultaneously pressing both sides of the substrate 10, the efficiency of compressing the coating layer 20 can be further increased.

In addition, as shown in Figure 4 (C), in the coating layer pressing step (S30), the entire surface of the substrate 10 on which the coating layer 20 is formed with a first thickness (H1) is simultaneously pressed (P) The coating layer 20 may be compressed to a second thickness H2. Therefore, by simultaneously pressing the entire area of the coating layer 20 with a uniform force, it is possible to induce the coating layer 20 to be compressed uniformly.

In this, in the coating layer pressing step (S30) according to various embodiments, the coating layer 20 may be preferably pressed at a pressure of 270kgf/m2 to 300kgf/m2, and accordingly, 30 on one surface of the substrate 10 The coating layer 20 formed with a first thickness H1 of µm to 35 µm may be compressed to a second thickness H2 of 20 µm to 32 µm.

Therefore, by compressing the coating layer 20 formed on one surface of the substrate 10 through the coating layer pressing step (S30), the surface of the coating layer 20 may be harder and durability may be further improved. In addition, in the process of pressing the coating layer 20, the adhesion strength of the surface boundary of each of the coating layers 21, 22, and 23 may be increased, and the occurrence of fine cracks may be reduced. In addition, through compaction of the coating layer 20, the coating layer 20 may be more flat, and the surface of the coating layer 20 may be smoother. In this way, in the coating layer pressing step (S30), air that may be generated on the surface between the coating layers 21, 22, and 23 may be removed, and the bonding interface between the coating layers 21, 22, and 23 may be made wider.

Therefore, the coating layer pressing step (S30) according to an embodiment of the present invention increases the adhesive strength of the coating layer 20 made of a multilayer structure, and extends the durability and life of the coating layer 20 by increasing the adhesive surface area. I can. In addition, through the coating layer pressing step (S30), the pin hole formed in the coating layer 20 is filled, so that food ingredients penetrate through the pinhole of the coating layer 20 to reduce the life of the coating layer 20 It can also have a preventive effect.

Subsequently, as shown in Figs. 5 and 6, in the container body forming step (S40), at least a portion of one surface of the substrate 10 on which the compressed coating layer 20 is formed is drawn to process the cooking container body ( 11) can be formed.

More specifically, as shown in FIG. 5, in a state in which the substrate is supported by a drawing die D2 in which a receiving groove having a shape corresponding to the outer shape of the cooking container body 11 is formed, the cooking container body 11 When one surface of the substrate 10 on which the coating layer 20 is pressed with a punch D1 formed in a shape corresponding to the inner shape is pressed, as shown in FIG. 6, the substrate 10 on which the coating layer 20 is formed and As the punch D1 is inserted into the receiving groove of the drawing die D2, the cooking container body 11 may be formed.

The cooking container body 11 processed in the container body forming step (S40) is formed of a cooking surface 11a and an inner wall surface 11b surrounding the cooking surface 11a to accommodate the food to be cooked. It can be formed into a bowl shape concave downward. In this case, a coating layer 20 compressed to a uniform thickness may be formed on the cooking surface 11a and the inner wall surface 11b of the cooking container body 11.

In addition, as shown in Figure 7, the coating layer 20 is recompressed so that the coating layer 20 formed on the cooking surface 11a and the inner wall surface 11b of the cooking container body 11 can be formed more firmly. The process of doing can be carried out additionally.

For example, in the coating layer recompression step, by pressing at least a portion of the cooking surface 11a and the inner wall surface 11b of the cooking container body 11, the coating layer 20 compressed to the second thickness H2 is formed to a third thickness. (H3) can be used for secondary pressing. In this case, the third thickness H3 may have the same thickness as the second thickness H2 or may be thinner than that.

More specifically, in the recompression step of the coating layer, press press using an elastic mold (M) so that the cooking surface 11a and the inner wall surface 11b formed inclined with respect to the cooking surface 11a can be uniformly pressed. The coating layer 20 may be secondarily compressed by using. As shown in Figure 7, the elastic mold (M) may be formed in a shape corresponding to the inner shape of the cooking container body 11, the elastic mold (M) of the cooking surface ( When 11a) is pressed, the inner wall surface 11b can also be uniformly pressed by the pressure spreading to the side of the elastic mold M. The step of recompressing the coating layer may be performed through hydroforming in addition to press pressing using an elastic mold (M).

Accordingly, the coating layer recompression step is, after the cooking container body 11 is formed, the coating layer 20 that is first compressed from the first thickness H1 to the second thickness H2 through the coating layer compression step S30 By compressing a second time, a portion of the coating layer 20 that was not sufficiently compressed in the coating layer pressing step (S30) or the coating layer 20 that has been deformed during the container body forming step (S40) is recompressed, Through the second compaction, the coating layer 20 may be more flat and the surface of the coating layer 20 may be smoother.

As such, the recompression step of the coating layer is not necessarily performed, and may be selectively performed according to the state of the coating layer 20 after the container body forming step (S40). Subsequently, as shown in FIG. 8, the handle 30 may be attached to one side of the finished cooking container body 11 to complete the cooking utensil.

Hereinafter, a manufacturing example for aiding understanding of the present invention will be described. The following preparation examples are presented to aid in the understanding of the present invention, and are not limited to the following preparation examples of the present invention.

As the substrate 10, a plate of stainless steel cladding on both sides of an aluminum plate was used. On one surface of the substrate 10, a third degree coating layer consisting of a primer coating layer 21, a Teflon coating layer 22, and a clear coating layer 23 was formed by the above-described method. At this time, the total thickness of the coating layer 20 was about 4 μm. The coating layer 20 was compressed by rolling the substrate 10 having the coating layer 20 formed thereon using rolling apparatuses R1 and R2 of the type shown in FIG. 4B. After compression, the thickness of the coating layer 20 was reduced to about 2 μm.

9A and 9B show the results of observing the surface structure of the coating layer 20 before and after compression with an optical microscope. Referring to (a) and (b) of FIG. 9, it can be seen that the surface structure of the coating layer 20 is micronized after compression compared to before compression. This is interpreted as a result that appears as the thickness of the coating layer 20 is reduced by pressing and the structure is densified.

Abrasion test was performed using it to check whether the durability was improved before/after compression bonding. The wear test was performed by repeatedly rubbing the coating layer 20 with an iron scrubber with a load of 10 kg, and then measuring and comparing the number of repeated frictions until the coating layer 20 is peeled off and the lower metal surface is exposed.

As a result of performing the abrasion test, it was found that the metal material began to be exposed after the number of friction cycles of the coating layer before compression was 8,000 times, and the metal material was completely exposed after the coating layer was peeled off after 10,000 times. In contrast, it was observed that the compressed coating layer 20 only slightly scratches the surface of the coating layer 20 even if the number of repeated friction times exceeds 10,000, and the coating layer 20 is not peeled off and remains as it is.

From this, it was confirmed that when the coating layer 20 was pressed, the durability of the coating layer 20 was significantly improved compared to before compression.

In summary, according to an embodiment of the present invention, a method of manufacturing a cooking utensil with a coating layer is provided by enhancing the durability of the coating layer 20 coated on the cooking utensil so that damage to the coating layer 20 does not occur easily. The cooking surface 11a and the inner wall surface 11b of the container body 11 may be more firmly protected. Accordingly, even if the cooking utensils are used for a long time, the coating layer 20 firmly protects the cooking surface 11a and the inner wall surface 11b of the cooking container body 11, and the function of the coating layer 20 is maintained as it is. As a result, while preventing food ingredients from sticking to the cooking surface 11a and the inner wall surface 11b, the pressed dirt can be easily removed during washing, and the metal material under the coating layer 20 is prevented from being exposed to the outside. It may have the effect of preventing the leakage of harmful ingredients.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those of ordinary skill in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: substrate
11: Cooking container body
11a: cooked noodles
11b: inner wall surface
20: coating layer
21: primer coating layer
22: Teflon coating layer
23: clear coating layer
30: handle
S: metal plate
R1: 1st rolling roll
R2: 2nd rolling roll
P: press
M: elastic mold

Claims (13)

Including a container body forming step of forming a cooking container body by drawing at least a portion of the substrate on which the coating layer is formed on at least one surface,
The substrate on which the coating layer is formed on at least one surface,
Including a coating layer pressing step of pressing the coating layer formed with a first thickness on the substrate in the coating layer forming step of spraying a coating liquid onto one surface of the substrate to compress the coating layer to a second thickness thinner than the first thickness. That is, a method of manufacturing a cooking appliance with a coating layer formed thereon. The method of claim 1,
In the coating layer pressing step,
A method of manufacturing a cooking utensil having a coating layer formed by sequentially pressing the coating layer to the second thickness by sequentially pressing the entire surface of the substrate on which the coating layer is formed to the first thickness with a rotating first rolling roll. The method of claim 2,
In the coating layer pressing step,
Cooking with a coating layer by sequentially pressing the entire other surface of the substrate with a second rolling roll formed to face the first rolling roll and rotating, simultaneously pressing both sides of the substrate to compress the coating layer to the second thickness Method of making the appliance. The method of claim 1,
In the coating layer pressing step,
A method of manufacturing a cooking appliance with a coating layer, wherein the entire surface of the substrate on which the coating layer is formed is simultaneously pressed to the first thickness to compress the coating layer to the second thickness. The method of claim 1,
In the coating layer pressing step,
A method of manufacturing a cooking utensil having a coating layer by compressing the coating layer formed on one surface of the substrate to the first thickness of 30 μm to 35 μm to the second thickness of 20 μm to 32 μm. The method of claim 1,
In the container body forming step,
The cooking container body is formed of a cooking surface and an inner wall surface surrounding the cooking surface so as to accommodate the food to be cooked and formed in a shape of a bowl that is concave downward. The method of claim 6,
A coating layer recompression step of pressing at least a portion of the cooking surface and the inner wall surface of the cooking container body to secondarily press the coating layer compressed to the second thickness to a third thickness;
A method of manufacturing a cooking appliance including a further comprising a coating layer. The method of claim 7,
In the coating layer recompression step,
In order to uniformly press the cooking surface and the inner wall surface formed inclined with respect to the cooking surface, the coating layer is secondarily compressed using press pressing using an elastic mold or hydroforming. Manufacturing method. The method of claim 1,
The substrate,
A method of manufacturing a cooking utensil with a coating layer comprising any one of aluminum, stainless steel, magnesium, and alloys thereof. The method of claim 1,
The substrate,
A method of manufacturing a cookware with a coating layer, which is a multi-layered metal plate formed by cladding a stainless steel plate on one or both sides of an aluminum (Al) plate. The method of claim 1,
The coating layer includes Teflon, a method of manufacturing a cooking appliance with a coating layer formed thereon. The method of claim 1,
The coating layer forming step,
A primer coating step of forming a primer coating layer on one surface of the substrate and drying by heating;
An intermediate coating step of forming a Teflon coating layer containing a fluororesin dispersion on the upper surface of the primer coating layer and drying by heating; And
Top coat coating step of forming a transparent clear coating layer on the upper surface of the Teflon coating layer and drying by heating;
Containing, a method of manufacturing a cooking appliance with a coating layer formed. The method of claim 12,
The intermediate coating step,
A first Teflon layer forming step of forming a first Teflon coating layer including a fluorine resin dispersion on the upper surface of the primer coating layer and drying by heating; And
Forming a second Teflon layer including a fluororesin dispersion on the upper surface of the first Teflon coating layer and drying by heating;
Containing, a method of manufacturing a cooking appliance with a coating layer formed.

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