KR100734401B1 - Cooking pot in electric pressure cooker, and manufacturing method thereof - Google Patents

Abstract

A cooking pot for an electrical high-pressure rice pot and a manufacturing method thereof are provided to prevent corrosion of the cooking pot by firmly maintaining sealing of fine gaps between adhesion portions of an inner pot, a middle pot, and an outer pot. A cooking pot(100) for an electrical high-pressure rice pot includes an inner pot(110), a middle pot(120), an outer pot(130), an inner primer coating layer(200), and a powder coating layer(210). The inner pot is made of a natural rock and ceramics in a container shape. The middle pot is coated on a surface of the inner pot by casting, and is made of a metal of high thermal conductivity and high thermal expansion. The outer pot is made of a metal of lower thermal expansion than the middle pot, and is pressed in the container shape of a smaller inner diameter than an outer diameter of the middle pot. The outer pot includes the middle pot inside by thermal fitting and cooling the middle pot after expanding the inner diameter of the outer pot larger than the outer diameter of the middle pot.

Description

Cooking pot in electric pressure cooker, and manufacturing method

1 is an exploded cross-sectional view of a cooker according to the prior art,

Figure 2 is a longitudinal sectional view of the cooker according to the prior art,

3 is a block diagram showing a method of manufacturing a cooker according to the prior art,

Figure 4 is a perspective view showing the cooker for the electric pressure cooker according to the present invention,

5 is a cross-sectional view taken along the line A-A of FIG.

Figure 6 is a block diagram showing a method of manufacturing a cooker for electric pressure cooker according to the present invention.

Explanation of symbols on main parts of drawing

100; Cooker 110; Inner pot

111; Guard jaw 112; Gradient surface

120; Heavy pot 130; A pot

200; Inner primer coating layer 210; Powder coating layer

220; Outer primer coating layer 300; Stud Nut

310; Handle 320; Fastener

The present invention relates to an electric pressure cooker, and more particularly to an electric cooker for an electric pressure cooker.

In general, the electric pressure cooker of the induction heating (hereinafter referred to as 'IH') type is composed of an aluminum body coated with a magnetic film.

Referring to the principle of operation of the IH electric pressure cooker composed of the above configuration, first, a high-frequency current flows to the coil built into the cooker body, the magnetic force lines generated around the coil passes through the cooker and the secondary current It's organic.

At this time, Joule heat is generated by the secondary current and the resistance of the cooker, and the cooker is heated by the heat to enable cooking of the food.

The conventional IH cooker for an IH electric pressure cooker is produced by using a single stainless steel plate or CLAD (stainless steel + aluminum) plate by the press method as a whole, it is easy to manufacture and has an excellent thermal conductivity.

Recently, in addition to the above-mentioned type of cooking machine, a stone pot as proposed in the Korean Utility Model Registration No. 312316 has been in the spotlight by consumers.

This is because the aluminum coating is coated by casting on the entire circumference of the stone cooker, which protects the brittle stone cooker from breakage, and when the container is heated, heat is transferred to the front of the stone cooker through the aluminum coating to evenly distribute the food in the stone cooker. There is an advantage that can be heated.

However, the above-mentioned inner pot is a fatal problem in that the cook in the stone pot is not evenly cooked because the thermal conductivity from the aluminum cladding to the stone cooker drops due to the thermal expansion coefficient difference between the stone cooker and the aluminum cladding during heating. There was this.

In addition, since the pores are generated in the tissue during the casting of the aluminum cladding, the cooking pressure in the stone cooker leaks to the outside through the pores of the aluminum cladding, so that the aluminum cladding is sufficiently thick to prevent this. There is a hassle to finish separately, and even if the process goes through this process, pores are not removed during the grinding process, so it is often impossible to completely eliminate the cooking pressure leakage.

In order to solve the above problems, Patent Application No. 2005-0047189 (name of the invention: a cooker and a method of manufacturing the cooker) has recently been proposed.

1 is an exploded cross-sectional view of a cooker according to the prior art, Figure 2 is a longitudinal cross-sectional view of the cooker according to the prior art.

As illustrated in FIGS. 1 and 2, the cooker includes an inner pot 10 having a natural stone or ceramic processed into a container shape, and is coated on the surface of the inner pot 10 by casting, and thermal conductivity and thermal expansion rate are increased. A heavy pot 20 made of a high metal material, and a metal material having a low coefficient of thermal expansion compared to the heavy pot 20, and is press-molded into a container shape so as to have an inner diameter smaller than the outer diameter of the heavy pot 20. The inner pot is composed of an outer pot 30 in which the inner pot 20 is press-fitted as it is cooled by shrinking and cooling the middle pot 20 in a state in which the inner diameter is thermally expanded to be larger than the outer diameter of the middle pot 20 by adding P.

In the drawing, reference numeral 21 denotes a protective jaw and reference numeral 22 denotes a gradient surface.

3 is a block diagram showing a method of manufacturing a cooker according to the prior art.

As illustrated in FIG. 3, the method of manufacturing a cooker includes: cutting a natural stone or a ceramic into a container to form an inner pot (first step); Coating a heavy pot made of a metal material having high thermal conductivity and thermal expansion rate on the surface and upper end of the inner pot by casting (second step); Finishing the inner diameter of the inner pot (third step); Finishing the outer diameter of the inner pot (fourth step); Press-molding a metal plate with a low thermal expansion rate compared to the material of the middle pot to produce a pot by press-molding the outer pot, and heat shrinking the pot in a state in which the inner pot of the pot is thermally expanded to be larger than the outer pot of the pot. After cooling, as the outer pot is condensed, the middle pot is made to be pressed into the inside of the outer pot (the fifth step). And after the fifth step, further comprising a surface polishing process of the outer pot (sixth step), and after the fifth step, forming a hairline on the inner circumferential surface of the inner circumference of the outer pot that is not in contact with the heavy pot (seventh step) ) Is further included, and after the fifth step, a coating process for preventing corrosion (eighth step) is further included at the top of the middle pot.

However, in the conventional cooker and the method of manufacturing the cooker, minute gaps are generated between the junction portions of the inner pot, the heavy pot, and the outer pot forming the cooker. And, there was a problem that is easily broken in the external impact.

In addition, the conventional cooker is not good releasability, since the rice grains easily adhere to the surface, there was a problem in which washing dishes is very inconvenient.

In addition, the conventional cooker is made of an aluminum material of the heavy pot, there was a problem that can cause a fatal danger to the human body due to exposure to harmful components of this aluminum material.

The present invention has been devised to solve the above problems, to ensure the airtight between the junction between the inner pot, the heavy pot, and the outer pot to prevent corrosion and solidity, excellent mold release properties, rice grains do not stick easily, aluminum material The purpose is to provide a hygienic and stable cooker for electric pressure cooker and its manufacturing method by preventing the leakage of harmful components.

According to an aspect of the present invention for achieving the above object, the inner pot processed natural stone or ceramic in the shape of a container, a heavy pot made of a metal material coated by casting on the surface of the inner pot and high thermal conductivity and thermal expansion rate, It is made of a metal material having a lower thermal expansion rate than the middle pot, and press-molded into a container shape so as to have an inner diameter smaller than the outer diameter of the middle pot, and heat the core pot in a state in which the inner diameter is thermally expanded to be larger than the outer diameter of the middle pot. And an electric pot cooker comprising an outer pot in which the heavy pot is press-fitted by cooling, from the end of the inner circumferential surface of the inner pot to the top end of the inner circumferential surface of the outer pot, a tight gap between the inner pot, the middle pot, and the outer pot. It is characterized in that the inner primer coating layer and the powder coating layer are sequentially formed to maintain the Provide a cooker for electric pressure cooker.

The middle pot is an aluminum alloy, and the outer pot is preferably any one of a stainless alloy, an aluminum alloy, and a clad plate.

When the outer pot is a clad plate made of an aluminum alloy or the outer surface of the metal other than the stainless alloy, an outer primer coating layer for preventing corrosion and maintaining gloss is formed on the outer circumferential surface of the outer pot.

Preferably, the inner primer coating layer and the powder coating layer are FFA resin series, and the outer primer coating layer is PFT resin series.

The thickness of the inner primer coating layer is 8 ~ 15㎛, the thickness of the powder coating layer is 42 ~ 65㎛, characterized in that the thickness of the outer primer coating layer is 20 ~ 30㎛.

A pair of stud nuts are fixed to the outer surface of the outer pot so as to be symmetrical to each other, and a handle is fixed to the stud nuts by a fastener.

The forming period of the inner primer coating layer and the powder coating layer at the end of the inner pot is characterized in that the section from 1 to 2mm downward from the end of the inner pot.

According to another aspect of the present invention for achieving the above object, the first step of forming the inner pot by cutting natural stone or ceramic in the form of a container, and a metal material having high thermal conductivity and thermal expansion coefficient on the surface and the upper end of the inner pot The second step of coating the heavy pot of the casting by, the third step of finishing the inner diameter of the inner pot, the fourth step of finishing the outer diameter of the heavy pot, and the metal having a low thermal expansion rate compared to the material of the heavy pot The outer pot is condensed as the outer pot is condensed as the plate is press-molded to have a container shape, and the outer pot is condensed and cooled by applying heat to the outer pot so that the inner diameter of the outer pot is larger than the outer diameter of the middle pot. As the manufacturing method of the cooker for an electric pressure cooker comprising a fifth step to be in the state pressed into the inside of the outer pot, the inner pot, the heavy pot, and the outer pot A sixth step of glossing the surface of the outer pot in a coupled state; A seventh step of forming an inner primer coating layer which maintains airtightness of a minute gap between the inner pot, the middle pot, and the outer pot from the inner circumferential end of the inner pot to the upper end of the inner circumferential surface of the outer pot; And an eighth step of forming a powder coating layer on the inner primer coating layer to protect the inner primer coating layer.

After the fifth step further comprises a step 5-1 to dry in a drying furnace.

Polishing the surface of the outer pot in the sixth step is performed by sand blasting.

The method further includes a step 7-1 of drying the inner primer coating layer formed in the seventh step.

The method may further include an eighth step of drying the powder coating layer formed in the eighth step.

When the inner primer coating layer and the powder coating layer are respectively formed in the seventh and eighth steps, it is preferable to mask the remaining portions of the inner pot except for the ends.

After the eighth step further comprises a ninth step of attaching a handle to the outer surface of the outer pot.

The heavy pot is an aluminum alloy, the outer pot is any one of a stainless alloy, aluminum alloy, clad plate material, if the outer pot is a clad plate material of the aluminum alloy or the outer surface of the metal other than the stainless alloy, after the sixth step The outer pot further includes a step 6-1 to form an outer primer coating layer for preventing corrosion and maintaining gloss.

The method further includes a step 6-2 of drying the outer primer coating layer formed in step 6-1.

Hereinafter, with reference to the accompanying drawings illustrating a preferred embodiment of the cooker for electric pressure cooker according to the present invention and a manufacturing method thereof are as follows.

Figure 4 is a perspective view showing a cooker for an electric pressure cooker according to the present invention, Figure 5 is a cross-sectional view taken along the line A-A of FIG.

As shown in Figure 4 and 5, the cooker 100 for the electric pressure cooker according to the present invention, the inner pot 110 is processed in a container shape of natural stone or ceramic, and cast on the surface of the inner pot 110 The middle pot 120 is made of a metal material which is coated by and has a high thermal conductivity and a high thermal expansion rate, and a metal material having a low thermal expansion rate compared to the middle pot 120 and also has an inner diameter smaller than the outer diameter of the middle pot 120. Press pot into a container shape and heat is applied to the outer pot so that the inner diameter is larger than the outer diameter of the heavy pot 120, the hot pot 120 is shrinked and cooled as the outer pot is pressed into the outer pot ( 130, the inner circumferential end of the inner pot 110 to the upper end of the inner circumferential surface of the outer pot 130 to maintain the tightness of the fine gap between the inner pot 110, the middle pot 120, and the outer pot 130 Internal Primer Nose Layer 200 and the powder (Powder) coating layer 210 are sequentially formed.

First, the cooker 100 according to the present invention, the heavy pot 120 is an aluminum alloy, the outer pot 130 is preferably a stainless alloy.

However, the middle pot 120 and the outer pot 130 may be all aluminum alloy, the middle pot 120 is an aluminum alloy and the outer pot 130 may be a clad (CLAD) plate made by overlapping the aluminum alloy and stainless alloy plate material. Do.

In addition, the clad plate is usually made of a stainless alloy on the outside and made of an aluminum alloy on the inside, or made of an aluminum alloy on the outside.

In the present invention, when the outer pot 130 is a clad plate made of an aluminum alloy or an outer surface of a metal other than a stainless alloy, it is preferable that an outer primer coating layer for preventing corrosion and maintaining gloss is formed on the outer circumferential surface of the outer pot 130.

And the upper end of the inner pot 110 is preferably cast to be wrapped by the upper end of the heavy pot 120. That is, the protective jaw 111 of the inner pot 110 is formed in the middle pot 120, the protective jaw forms a gradient surface 112 as shown in the figure.

In an embodiment, the inner primer coating layer 200 and the powder coating layer 210 are preferably PFA (perfluoroalkoxy) resin series.

In general, the FFA resin series is a highly functional plastic, and has excellent chemical resistance, excellent heat resistance, water resistance, and releasability, injection molding, and excellent weldability.

The thickness of the inner primer coating layer 200 is 8 ~ 15㎛, the thickness of the powder coating layer 210 is preferably 42 ~ 65㎛.

Accordingly, the total thickness of the inner primer coating layer 200 and the powder coating layer 210 is preferably 50 ~ 80㎛.

Meanwhile, the outer primer coating layer 220 formed when the outer pot 130 is a clad plate material having an aluminum alloy or an outer surface of a metal other than a stainless alloy is preferably a polytetrafluorethylene (PTFE) resin series.

Generally, PTF resin series is a high-performance plastic having the highest chemical resistance among plastics, and has excellent chemical resistance as well as excellent heat resistance, self-lubricating property, water resistance, and releasability. In particular, PTF resin series have the lowest coefficient of friction and excellent dielectric properties.

The thickness of the outer primer coating layer 220 is preferably 20 ~ 30㎛.

In addition, the forming section (h) of the inner primer coating layer 200 and the powder coating layer 210 at the end of the inner pot 110 is preferably a section from 1 to 2 mm downward from the end of the inner pot 110. Do.

In the cooker according to the present invention, a pair of stud nuts 300 are fixed to the outer surface of the outer pot 130 so as to be symmetrical with each other, and the handle 310 is fastened to the fastener 320 by the stud nuts 300. It may be fixed by.

As such, if the handle 310 is provided in the cooker 100, the user may carry the cooker 100 stably without fear of burns when the user pulls out the hot cooker 100 from the electric pressure cooker. There are advantages to it.

Electric cooker 100 for the electric pressure cooker according to the present invention, the inner pot 110, the middle pot 120, and the outer pot 130 from the inner circumferential end of the inner pot 110 to the upper end of the inner circumferential surface of the outer pot 130. The inner primer coating layer 200 and the powder coating layer 210 are sequentially formed so as to maintain the tightness of the fine gaps between them, and the outer primer coating layer 220 for preventing corrosion and maintaining gloss is formed on the outer circumferential surface of the outer pot 130. By doing so, since the airtightness of the minute gaps is firmly maintained between the junction portions of the inner pot 110, the middle pot 120, and the outer pot 130, the corrosion of the cooker 100 can be prevented, and the inner pot 110, There is an excellent effect that can increase the bonding between the heavy pot 120, and the outer pot 130 has a robustness that is not easily broken even from the external impact.

In addition, the cooker 100 for the electric pressure cooker according to the present invention, since the inner primer coating layer 200, the powder coating layer 210, the outer primer coating layer 220 is formed, the release property is good, the grain of rice on the surface Because it does not stick easily, washing dishes has a very convenient effect.

In addition, the cooker 100 for the electric pressure cooker according to the present invention, even if the heavy pot 120 is made of aluminum, the inner primer coating layer 200 and the powder coating layer 210, the outer primer coating layer 220 ) Is formed, thereby preventing the exposure of harmful components of this aluminum material, there is always a safe and hygienic effect.

Figure 6 is a block diagram showing a method of manufacturing a cooker for electric pressure cooker according to the present invention.

As shown in Figure 6, the manufacturing method of the cooker for electric pressure cooker according to the present invention, the first step (S10) to form the inner pot by cutting the natural stone or ceramic in the form of a container, and the surface of the inner pot and The second step (S20) of coating the heavy pot of the metal material having high thermal conductivity and thermal expansion coefficient in the upper end by casting, the third step (S30) for finishing the inner diameter of the inner pot, and the outer diameter of the heavy pot The fourth step (S40) and the metal plate material having a low thermal expansion rate compared to the material of the heavy pot is press-molded to have a container shape, to produce an outer pot, by applying heat to the outer pot so that the inner diameter of the outer pot is larger than the outer diameter of the heavy pot. As the outer pot is condensed after cooling the middle pot in a state of thermal expansion and the outer pot is condensed, the middle pot is pressed into the inside of the outer pot, and includes a fifth step (S50), and the sixth to eighth steps (S60). To S80) It further includes.

First, the method further includes a fifth step (S51) of drying in a drying furnace after the fifth step (S50).

The sixth step (S60) is to polish the surface of the outer pot in the state that the inner pot, the middle pot, and the outer pot are coupled to each other.

Gloss on the surface of the outer pot in the sixth step (S60) is preferably made by sand blast (Sand Blast).

However, the gloss of the surface of the outer pot 130 may be performed by other methods than sand blast.

The seventh step (S70) is to form an inner primer coating layer to maintain the airtightness of the fine gap between the inner pot, the middle pot, and the outer pot from the inner peripheral surface end of the inner pot to the upper end of the inner peripheral surface of the outer pot.

In order to securely adhere and maintain the inner primer coating layer formed in the seventh step S70, it is preferable to further include a seventh step (S71) of drying the inner primer coating layer.

Here, the drying of the inner primer coating layer may be by a furnace or other drying method.

The eighth step (S80) is to form a powder coating layer on the inner primer coating layer to protect the inner primer coating layer.

In order to securely adhere and maintain the powder coating layer formed in the eighth step S80, it is preferable to further include an eighth step (S81) for drying the powder coating layer.

Here, the drying of the powder coating layer may be by a furnace or other drying method.

And when forming the inner primer coating layer and the powder coating layer in the seventh step (S70) and the eighth step (S80), respectively, masking the remaining portion except for the end ('h' in Figure 5) in the inner pot (Masking) Treatment is preferred. The masking means is a tape or other blocking member.

After the eighth step (S80) further comprises a ninth step (S90) for attaching the handle to the outer surface of the outer pot.

On the other hand, the heavy pot is an aluminum alloy, the outer pot is any one of a stainless alloy, aluminum alloy, clad plate.

At this time, if the outer pot is a clad plate material of the aluminum alloy or the outer surface of the metal other than the stainless alloy, after the sixth step (S60) 6 to form an outer primer coating layer for preventing corrosion and maintaining the gloss on the surface of the outer pot -1 step (S61) is further included.

It is preferable to further include a 6-2 step (S62) for drying the outer primer coating layer in order to ensure the close contact and maintenance of the outer primer coating layer formed in the 6-1 step (S61).

Here, the drying of the outer primer coating layer may be a drying furnace or other drying method.

The cooker completed by the above-described manufacturing method is as shown in FIGS. 4 and 5.

The present invention is a cooker for electric pressure cooker and a manufacturing method thereof, the inner primer coating layer and the powder coating layer to maintain the airtightness of the fine gap between the inner pot, the middle pot, and the outer pot from the inner peripheral surface end of the inner pot to the upper end of the inner peripheral surface of the outer pot Since the sequential formation and the outer primer coating layer for preventing corrosion and maintaining gloss are formed on the outer circumferential surface of the outer pot, it is possible to ensure the airtightness of the minute gaps between the inner pot, the heavy pot, and the joint portion of the outer pot, It is possible to prevent corrosion and increase the bonding between the inner pot, the middle pot, and the outer pot, and has an excellent effect of having a firmness that is not easily broken even by an external impact.

In addition, the present invention is to make the inner primer coating layer and powder coating layer, the outer primer coating layer is formed, because the releasability is good because the rice grains do not easily stick to the surface has a very convenient effect.

In addition, the present invention, even if the middle pot is made of an aluminum material, so that the inner primer coating layer, powder coating layer, the outer primer coating layer is formed, thereby preventing the harmful ingredient exposure of the aluminum material, there is always a safe and hygienic effect.

In addition, the present invention is to provide a handle to the cooker, there is an advantage that the user can carry the cooker stably without worrying burns when the user withdraws the hot cooker from the electric pressure cooker.

Claims (16)

Inner pot processed natural stone or ceramics in the shape of a container, a heavy pot made of a metal material coated by casting on the surface of the inner pot and having high thermal conductivity and thermal expansion rate, and a metal material having a lower thermal expansion rate than the heavy pot. In addition, the outer pot is press-molded in the state in which the inner pot is press-fitted and cooled in a state in which the inner diameter is thermally expanded so that the inner diameter is larger than the outer diameter of the heavy pot by cooling it by pressing the container shape to have an inner diameter smaller than the outer diameter of the middle pot. As a cooker for an electric pressure cooker to include, The inner primer coating layer and the powder coating layer are sequentially formed to maintain the tightness of the fine gap between the inner pot, the middle pot, and the outer pot from the inner circumferential end of the inner pot to the upper end of the inner circumferential surface of the outer pot. Use. The method of claim 1, The heavy pot is an aluminum alloy, the outer pot is a stainless steel, aluminum alloy, a cooker for an electric pressure cooker, characterized in that any one of the clad plate. The method of claim 2, When the outer pot is a clad plate of a metal other than aluminum alloy or the outer surface of the stainless alloy, the outer primer surface of the outer pot is characterized in that the outer primer coating layer for preventing corrosion and maintaining gloss is formed cooker for electric pressure cooker. The method according to any one of claims 1 to 3, The inner primer coating layer and the powder coating layer is a piezo resin series, the outer primer coating layer is a piezoelectric cooker for the electric pressure cooker, characterized in that the resin series. The method of claim 4, wherein The thickness of the inner primer coating layer is 8 ~ 15㎛, the thickness of the powder coating layer is 42 ~ 65㎛, the thickness of the outer primer coating layer is a cooker for an electric pressure cooker, characterized in that 20 ~ 30㎛. The method of claim 1, A pair of stud nuts are fixed to the outer surface of the outer pot so as to be symmetrical with each other, and the handle is fixed to the stud nuts by a fastener. The method of claim 1, The forming section of the inner primer coating layer and the powder coating layer at the end of the inner pot is a section for electric pressure cooker, characterized in that the section from 1 to 2mm downward from the end of the inner pot. A first step of forming an inner pot by cutting natural stone or ceramic into a container shape, a second step of coating a heavy pot made of metal having high thermal conductivity and thermal expansion rate on the surface and upper end of the inner pot by casting, and the inner pot The third step of finishing the inner diameter of the third step, the fourth step of finishing the outer diameter of the heavy pot, and a low-expansion metal plate material compared to the material of the heavy pot by press-molding to have a container shape to produce an outer pot, the outer pot The fifth step is to condense the outer pot as the inner pot is condensed as the inner pot is condensed by cooling and shrinking the middle pot in a state in which the inner pot of the outer pot is expanded to be larger than the outer diameter of the middle pot by applying heat to the inner pot. As a manufacturing method of the cooker for an electric pressure cooker comprising, A sixth step of glossing the surface of the outer pot in a state in which the inner pot, the middle pot, and the outer pot are coupled to each other; A seventh step of forming an inner primer coating layer which maintains airtightness of a minute gap between the inner pot, the middle pot, and the outer pot from the inner circumferential end of the inner pot to the upper end of the inner circumferential surface of the outer pot; And And an eighth step of forming a powder coating layer on the inner primer coating layer to protect the inner primer coating layer. The method of claim 8, Method for producing an electric pressure cooker for a cooker, characterized in that it further comprises a fifth step of drying in a drying furnace after the fifth step. The method of claim 8, Gloss on the surface of the outer pot in the sixth step is a manufacturing method of the cooker for electric pressure cooker, characterized in that made by sand blast. The method of claim 8, The method of claim 11, further comprising the step 7-1 of drying the inner primer coating layer formed in the seventh step. The method of claim 8, The method of claim 11, further comprising the step 8-1 of drying the powder coating layer formed in the eighth step. The method of claim 8, When forming the inner primer coating layer and the powder coating layer in the seventh and eighth step, respectively, the method of manufacturing a cooker for an electric pressure cooker, characterized in that for masking the remaining portions of the inner pot except the end. The method of claim 8, And a ninth step of attaching a handle to the outer surface of the outer pot after the eighth step. The method of claim 8, The heavy pot is an aluminum alloy, the outer pot is any one of a stainless alloy, aluminum alloy, clad plate, If the outer pot is a clad plate material of the aluminum alloy or the outer surface is a metal other than the stainless alloy, after the sixth step further comprises a step 6-1 to form an outer primer coating layer for preventing corrosion and maintaining gloss on the surface of the outer pot Method for producing a cooker for electric pressure cooker, characterized in that. The method of claim 15, The method of claim 11, further comprising the step 6-2 of drying the outer primer coating layer formed in step 6-1.

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