KR20180089010A - Disposable cooking container and manufacturing thereof - Google Patents

Abstract

The present invention relates to a disposable cooking container and a manufacturing method thereof. A disposable cooking container according to the present invention comprises: a wall which has a hollow container shape of a wall surface and is composed of a paper material; a floor plate which is combined to the bottom end of the wall to seal the bottom part of the wall, makes a connection side part which is connected to the outer surface of the wall extend to the top part of the wall, and is composed of a metal material; and a release paper which is stuck to the bottom surface of the floor plate to be separable and allows a magnetic substance powder be invaginated at the inside or surface thereof. According to the present invention, since a magnetic substance powder is invaginated at a release paper which performs a function of protecting a product, a cooking container can be heated by an inductive heating type heat source when a release paper is attached. Additionally, a cooking container can be heated by a direct heating type heat source when a release paper is separated. Therefore, provided is a disposable cooking container which adopts a low magnetic material or a nonmagnetic metal material with good ductility like aluminium as a material which constitutes a floor plate, and can be used to be compatible with various heat sources.

Description

[0001] DISPOSABLE COOKING CONTAINER AND MANUFACTURING THEREOF [0002]

The present invention relates to a disposable cooking vessel which can be used interchangeably with an induction heating type heat source and a direct heating type heat source, and a manufacturing method thereof.

Generally, disposable cooking vessels such as cup noodles are products for eating food such as ramen by pouring hot water into the food inside the container. Conventionally, the cup noodles are formed into a plurality of folds of styrofoam to produce the wall of the container. The food inside the cup can be easily cooked by hot water because the air layers formed between the styrofoam layers prevent the heat inside the container from being released to the outside.

However, because styrofoam emits a carcinogenic substance such as benzene or a substance that induces environmental hormones, in recent years, many cup noodles have been converted into paper materials, and polypropylene (PP) or polyethylene (PE ) To produce containers for cups.

However, one of the problems that arise when using paper containers is that they are less resistant to internal heat than styrofoam containers. Accordingly, many users use cup noodles by heating them with a microwave oven or the like. However, they have problems such as inconvenience in use, limited space, and generation of harmful substances to human body.

On the other hand, Korean Patent No. 10-1489800 proposes a disposable cooking container for an induction range. According to the prior art, a magnetic metal plate is rigidly attached to the bottom of the disposable cooking vessel without using an adhesive harmful to the human body, so that the disposable cooking vessel can be used in the induction range.

However, the technology of the above prior art has a problem that it can not be used in a direct heating type heat source such as a gas range, although the base plate is made of paper and can be used in an induction heating type heat source such as an induction range.

Further, since the metal plate is attached to the upper surface of the base plate, there is a problem that the heat transfer efficiency is significantly lowered even in the induction range. Further, since metals such as aluminum have good ductility and relatively low cost, they are widely used as materials for containers. However, since their magnetic properties are weaker than those of other metals, they are difficult to use in an induction range. It is difficult to use the material of the metal alloy including the metal alloy.

Korean Patent No. 10-1489800

Disclosed is a disposable cooking vessel of a new structure capable of being used as a metal material of low magnetism or a non-magnetic metal material for a bottom plate while being compatible with induction heating type heat source and direct heating type heat source, The present invention has been made in view of the above problems.

According to an aspect of the present invention, there is provided a disposable cooking container comprising: a wall having a hollow cylindrical wall surface and made of a paper material; A metal bottom plate coupled to a lower end of the wall to close a lower portion of the wall and having a joining side joined to an outer surface of the wall, And a release paper which is detachably adhered to the lower surface of the bottom plate and on which the magnetic material powder is embedded.

The disposable cooking vessel according to another embodiment of the present invention further includes a cover which is invisibly engaged with the upper end of the wall.

In the disposable cooking vessel according to another embodiment of the present invention, the wall has a rectangular flat cross section, and a lower portion of the wall forms a support portion supported by a bottom surface on which the cooking vessel is mounted, The upper portion of which forms an inwardly folded portion to protect the product received therein.

In the disposable cooking container according to another embodiment of the present invention, the wall has an upper light-tight narrowing shape so that a flat section of the folding section has a larger area than a flat section of the supporting section.

In the disposable cooking vessel according to another embodiment of the present invention, a first wall surface of mutually opposing wall surfaces of the wall may be provided with a plurality of first wall portions, which are overlapped with each other when the folding portions are folded first, And a second wall surface opposed to each other in the other direction among the wall surfaces is folded in a direction opposite to the direction in which the folding portion is folded when the folding portion is folded in the second direction so as to disperse the stress applied to the folding portion, A cover rib is formed to protrude.

The disposable cooking container according to another embodiment of the present invention is formed with a bending line that is bent outward to form an obtuse angle in the corner portion adjacent to each corner of the support portion.

In the disposable cooking vessel according to another embodiment of the present invention, at least one side of the wall is coated with a urethane-based resin primary coating and an acrylic-based resin is coated with the secondary coating.

In the disposable cooking vessel according to another embodiment of the present invention, a waterproof material is coated on the lower end of the wall contacting the bottom surface of the bottom plate toward the thickness side.

In the disposable cooking vessel according to another embodiment of the present invention, the bottom plate is made of aluminum or a metal alloy including aluminum, and an acrylic resin is coated on the inner surface of the bottom plate.

According to an embodiment of the present invention, there is provided a method of manufacturing a disposable food container comprising the steps of: (a) forming a wall made of a paper material having a hollow cylindrical wall; (b) positioning a bottom plate of metal at the bottom of the wall to seal the bottom of the wall; (c) bending the rim of the bottom plate upwardly to form a joining side; (d) joining the inner surface of the joining side to the outer surface of the wall; (e) embedding magnetic powder into a release paper having a shape corresponding to a bottom surface of the bottom plate; And (f) adhering the release paper separably to the lower surface of the bottom plate.

The method of manufacturing a disposable food container according to another embodiment of the present invention is characterized in that the step (a) comprises: (a-1) first coating a urethane-based resin on both surfaces of a roll-shaped mother sheet; (a-2) secondary coating an acrylic resin on both sides of the mother sheet; (a-3) forming a cutting line along the outer shape of the wall on the mother sheet; (a-4) cutting the mother sheet along the cutting line; (a-5) coating a waterproof material along the cut surface in the step (a-4); And (a-6) assembling the wall.

In the method of manufacturing a disposable food container according to another embodiment of the present invention, the wall has a rectangular flat cross-section, and the step (a-3) And forming a folding line relatively weaker than the other portion between the supporting portion that is supported and raised and the folding portion that is folded inward to protect the product received in the upper portion of the wall portion.

In the method of manufacturing a disposable food container according to another embodiment of the present invention, the wall has an upper light-tight narrowing shape such that a flat section of the folding section has a larger area than a flat section of the supporting section.

The method of manufacturing a disposable food container according to another embodiment of the present invention is characterized in that the step (a-3) forms a curved fold line which is adjacent to each corner of the support portion and which is bent outward to form an obtuse angle in the corner portion .

According to another embodiment of the present invention, there is provided a method of manufacturing a disposable cooking container, wherein the bottom plate is made of aluminum or a metal alloy containing aluminum, and the step (b) Further comprising the step of coating.

According to the disposable cooking container and the method for manufacturing the same of the present invention, by incorporating the magnetic material powder into the release paper that performs the function of protecting the product, it is possible to heat the cooking container with the induction heating type heat source while the release paper is stuck, The cooking vessel can be heated by a direct heating type heat source in one state, so that the material constituting the bottom plate can be adopted as a material having a good ductility, such as aluminum, or a material having a low magnetic property or a non-magnetic metal material, Thereby providing a usable disposable cooking vessel.

1 is an exploded perspective view showing an embodiment of a disposable cooking container according to the present invention,
FIG. 2 is a sectional view showing an example in which the embodiment of FIG. 1 is used in an induction range,
FIG. 3 is a sectional view showing an example in which the embodiment of FIG. 1 is used in a gas range,
4 is an exploded perspective view showing another embodiment of the disposable cooking container according to the present invention,
5 is an exploded view illustrating the structure of a wall in the embodiment of FIG. 4,
Figure 6 is a flow chart showing the process of manufacturing the wall of Figure 5, and
7 to 10 are views illustrating a packaging process of the container according to the embodiment of FIG.

Hereinafter, specific embodiments according to the present invention will be described with reference to the accompanying drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Parts having similar configurations and operations throughout the specification are denoted by the same reference numerals. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

In the following description of the embodiments, redundant descriptions and explanations of techniques obvious to those skilled in the art are omitted. Also, in the following description, when a section is referred to as "comprising " another element, it means that it may further include other elements in addition to the described element unless otherwise specifically stated.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

1 is an exploded perspective view showing an embodiment of a disposable cooking container according to the present invention.

1, a disposable cooking container according to the present invention comprises a wall 100, a bottom plate 110, and a release sheet 120, and a cover 130 coupled to an upper end of the wall 100, .

The wall 100 has a hollow cylindrical wall surface and is formed of a paper material. Although the wall 100 is illustrated as a cylindrical shape in FIG. 1, the wall 100 may be formed in a rectangular tube shape or other polygonal cylindrical shape.

A bottom plate 110 is coupled to the bottom of the wall 100. The bottom plate 110 is tightly coupled to the bottom of the wall 100 so that the top surface of the bottom plate 110 forms the bottom surface of the container. And the bottom plate 110 is formed of a metal material, preferably a metal alloy containing aluminum or aluminum. The bottom plate 110 is directly heatable by a heat source such as a gas range, and is selected as a material that can be induction-heated by a heat source such as an induction range. However, the bottom plate 110 does not necessarily have high magnetic properties.

The releasing paper 120 is detachably adhered to the lower surface of the bottom plate 110 and functions to protect the bottom plate 110 during transportation and transportation of the cooking container and to assist in induction heating do. A handle 122 is protruded from one side of the release paper 120 to easily separate the release paper 120.

In the present invention, the release paper 120 is formed by impregnating a magnetic powder into the inside or the surface. The magnetic material powder embedded in the release paper 120 allows induction heating to proceed more effectively when the cooking vessel of the present invention is used in an induction range. In addition, the bottom plate 110 has an advantage of being able to select a material having relatively low magnetic properties, such as aluminum, which is inexpensive and has high ductility. Advantages of attaching / detaching the release paper 120 will be described later with reference to FIGS.

The lid 130 serves to protect the food or the packaged food contained in the cooking container and is attached to the upper end of the wall 100 or has an upper end portion of the wall 100, .

FIG. 2 is a sectional view showing an example in which the embodiment of FIG. 1 is used in an induction range, and FIG. 3 is a sectional view showing an example in which the embodiment of FIG. 1 is used in a gas range.

Referring to FIG. 2, the cooking vessel of the present invention is mounted on the induction range 200 with the lid 130 removed. When used in the induction heating type heat source as described above, it is preferable to use the release paper 120 attached to the lower surface of the bottom plate 110 without removing it.

As shown in the drawing, the cooking vessel is mounted in a structure in which the release paper 120 is interposed between the induction heating unit 210 of the induction range 200 and the bottom plate 110 of the cooking vessel. When the induction heating unit 210 is operated, the induction heating effect is raised by the magnetic material powder embedded in the release paper 120, and compared with the state in which the release paper 120 is removed, So that it can be heated at a high speed.

Referring to FIG. 3, when used in a direct heating type heat source such as the gas range 400, the heat transfer efficiency may be lowered by the release paper 120, so that it is preferable to use the paper after separating the release paper 120.

The flame of the gas range 400 is directly transmitted to the bottom portion 112 of the bottom plate 120 so that the cooking container can be heated at a high speed.

2 and 3, it can be seen that the bottom plate 110 is coupled to the lower end of the wall body 100. As shown in FIG. As shown in the figure, the wall 100 of the paper has a structure in which a lower portion is penetrated, and moisture of food can be introduced into a lower end portion of the wall 100 contacting the bottom surface of the bottom plate 110. To prevent this, it is preferable that a waterproof material (such as acrylic resin) is coated on the lower end of the wall 100 toward the thickness.

2 and 3, the joining of the wall 100 and the bottom plate 110 is made between the outer surface of the wall 100 and the inner surface of the joining side 114 which is bent upward from the bottom plate 110 . At this time, the wall member 100 is formed of a paper material, and the bottom plate 110 is formed of a metal material such as aluminum or an aluminum alloy. To this end, it is preferable to coat the outer surface of the wall 100 and the inner surface of the bottom plate 110 with the same acryl-based resin.

FIG. 4 is an exploded perspective view showing another embodiment of the disposable cooking container according to the present invention, in which the container has a rectangular cross-section with a flat cross-section.

4, the disposable cooking container is composed of a lid 500, a wall 600, a bottom plate 700, and a release sheet 800, Has a flat structure with a square structure and has a folding structure to reduce the volume.

The cover 500 protects the food or the packaged food contained in the container and includes a cover upper surface 510 on which a description of a product, a brand name, a graphic design, and the like is printed, and a cover upper surface 510, And an interference fit portion 520 which is in an upper portion of the body 600. In this embodiment, the cover 500 is coupled after the wall 600 is folded, and the structure and folding process of the wall 600 will be described later with reference to FIG. 5 and the following. Thus, by constituting the wall body 600 with the folding structure, the packaging volume of the cooking container can be greatly reduced.

Like the embodiment of FIG. 1, the bottom plate 700 is made of a metal material that can be directly heated, and has a structure in which the side walls extend upward and are joined to the outer surface of the wall body 600. The bottom plate 700 illustrated in Figure 5 is also preferably made of aluminum or an aluminum alloy.

Like the embodiment of FIG. 1, the releasing paper 800 has a structure in which magnetic powders are embedded, and a handle 810 is protruded to one side of the releasing paper 800 to easily separate the releasing paper 800.

The wall 600 has a support portion (refer to FIG. 5, which is depicted by a dotted line parallel to the bottom plate) formed along the center of the vertical direction, and a lower portion thereof is supported by a bottom surface supported by the bottom surface The upper portion thereof forms a folded portion folded inward to protect the product received therein and to reduce the volume of the cooking container.

Further, as shown in the drawings, the wall member 600 has an upper light-tight narrowing shape having a flat flat face of a folded portion in a larger area than a flat face of the supporting portion. By having the wall 600 in the shape of an upper light-tight conformation, the walls 600 can be superposed and stacked after the wall 600 is assembled, facilitating the handling and handling of the wall 600.

The structure of the wall 600, the manufacturing process, and the folding process will be described later with reference to FIG.

Fig. 5 is an exploded view illustrating the structure of the wall in the embodiment of Fig. 4;

The wall 600 of the present embodiment is formed with a cutting line along the outer shape of the wall 600 on the mother sheet and cutting the cutting line to extract the shape before assembly of the wall 600 as shown in the developed view of FIG. have.

5, the joint surface 630 depicted on the rightmost side is bonded to the corresponding surface on the leftmost side, and the portion depicted by the thick solid line in the vertical direction is folded to assemble the hollow wall 600 illustrated in FIG. .

A first cover rib 612 protrudes from the top of the first wall surface 610 and a second cover rib 622 protrudes from the second wall surface 620 opposite to the first wall rib 612 in the other direction after the wall 600 is assembled. Is protruded. The first cover ribs 612 are overlapped with each other when the folded portion of the first wall surface 610 is folded in a primary direction, thereby protecting the product received in the wall. The second cover ribs 622 are formed by folding the folded portion of the second wall surface 620 in a direction opposite to the direction in which the folded portion is folded when the folded portion of the second wall surface 620 is folded secondarily, It plays a role to maintain the standing ability without any additional hesitation.

Within the wall 600, a plurality of fold lines 631, 632, 633, 634, 635, and 636 depicted by dotted lines in FIG. 5 are formed. The fold lines are formed to be relatively weak as compared with other portions of the wall, so that it is easy to assemble the wall 600 after cutting along the developed view.

The first fold line 631 is formed between the second wall surface 620 and the second cover rib 622. The first fold line 631 is a fold line that is formed to facilitate the process of folding the second cover ribs 622 backward of the second wall surface 620.

The second folding line 632 is a folding line corresponding to the boundary between the supporting portion and the folding portion of the first wall surface 610 and is a folding line for facilitating folding of the folding portion inward from the first wall surface 610.

The third folding line 633 is a fold line extending diagonally from the end of the second folding line 632 to the center of the first folding line. When the folding portion of the first walling plane 610 is folded inward, It is a fold line folded.

The fourth fold line 634 is a fold line extending obliquely from the end of the third fold line 633 toward the end of the second cover rib 622. When the second cover rib 622 is bent backward And is folded along with the third folding line 633 to coincide with the third folding line 633.

The fifth folding line 635 is a folding line corresponding to the boundary between the support portion and the folding portion of the second wall surface 620 and is a folding line for facilitating folding of the folding portion inward from the second wall surface 620.

The folded fold line 636 is a folding line formed in a vertical direction adjacent to each corner of the lower support portion of the wall body 600. In the process of joining the bottom plate 700 to the lower portion of the assembled wall 600, So as to form an obtuse angle at the corner portion, thereby improving the bonding property of the bottom plate 700 to the side wall portion.

FIG. 6 is a flow chart showing a process of manufacturing the wall of FIG. 5, and a method of manufacturing the disposable cooking container according to the present invention will be described with reference to FIG.

First, a disposable cooking container according to the present invention has a structure in which a wall body 600, a bottom plate 700, and a release sheet 800 are manufactured and assembled, and a lid 500 is selectively coupled thereto, 6 illustrates a process of manufacturing the wall 600 from the double wall.

Referring to FIG. 6, the step is started by primarily coating urethane-based resin on both sides of the roll-shaped mother sheet (ST 610). Urethane-based resin is coated on both sides of the mother sheet while pulling out the rolled-up mother sheet. The urethane-based resin gives flexibility to the thick paper, and the fold lines 631 to 636 Thereby facilitating the assembly of the wall 600 in the process of folding.

Next, an acryl-based resin is secondarily coated on the surface coated with the urethane-based resin (ST620). The secondary coating layer functions as a protective layer for preventing cracks from being generated in the portions folded by the folding lines 631 to 636 and functions to improve the bonding property at the portion to be bonded to the bottom plate 700. [

Then, a cutting line is formed on the mother sheet along the outer shape of the wall body 600 (ST630). The cutting lines can be formed by printing a plurality of developed views depicted in Fig. 5 on the mother sheet. At this time, the fold lines 631 to 636 described with reference to FIG. 5 are formed together.

Next, the mother sheet is cut along the cut line generated in step ST630 (ST640). During the cutting process of the mother sheet, the coating layer may be broken at the cut portion, and the portion may become fragile. Particularly, the lower end of the wall body 600 contacting the upper surface of the bottom plate 700 may be infiltrated with moisture through the fragile portion of the inside of the container, which is a portion of the inside of the container, and may invade along the thickness of the wall body 600.

In order to prevent the above phenomenon, a waterproof material is coated along the cut surface in step ST640 (ST650). The waterproof material may be an acryl-based resin used in step ST620, or may be another material having waterproof property.

Next, the wall 600 is assembled as in the developed view illustrated in FIG. 5 (ST660).

After the wall 600 is assembled, a bottom plate 700 made of a metal is placed at the lower end of the wall 600. At this time, the bottom plate 700 may have a plate shape instead of the shape illustrated in FIG. The bottom plate 700 may be cut before being placed on the lower end of the wall 600, or cut after the wall 600 is placed.

The rim of the bottom plate 700 is bent upward to form a joining side, and the inner side of the joining side is joined to the outer surface of the lower portion of the wall 600. At this time, the same acrylic resin as the material used in step ST620 is coated on the top surface of the bottom plate 700 to improve the bonding property to the bottom plate 700 formed of aluminum or an aluminum alloy. Therefore, since the outer surface of the wall body 600 and the inner surface of the joining side of the bottom plate 700 have the same coating layer, the jointability of both is improved.

Next, the magnetic material powder is introduced into the releasing paper 800 and cut into a shape corresponding to the bottom shape of the bottom plate 700. Then, the releasing paper 800 is detachably adhered to the lower surface of the bottom plate 700. 7 illustrates a state in which the bottom plate 700 is joined to the lower portion of the wall 600. FIG.

7 to 10 are views illustrating a packaging process of the container according to the embodiment of FIG. Referring to FIGS. 7 to 10, a state in which the food 900 packed in the container is packed and packed in the present invention will now be described.

The perspective view of FIG. 7 depicts folding along the fold lines of the developed view shown in FIG. 5, and the bottom plate 700 being joined to the bottom.

8, a packaged food 900 (such as a bag or the like) can be stored therein.

The second cover ribs 622 are tilted rearwardly of the second wall surface 620 along the first fold line 631 described with reference to FIG. 5 and along the second fold line 632 to the first wall surface 620 610 are folded toward the inside of the container. Since the third folding line 633 and the fourth folding line 634 (the second cover ribs 622) are bent backward in the process of folding the folding portion of the first wall surface 610 along the second folding line 632 , As shown in Fig. 9, in a state in which it coincides with the third folding line 633) is folded inwardly interlocked with the second folding line.

At this time, the mutually opposing first cover ribs 612 are superimposed on each other to cover the product contained therein.

As shown in FIG. 10, when the folded portion of the second wall surface 620 is folded inward along the fifth fold line 635, the volume of the cooking container is greatly reduced. In the example of Fig. 10, the product is released on the top of the wall 600 with the lid 500 covered, as in the exploded perspective view of Fig.

When the consumer uses the product, the wall may be unfolded in the reverse order of FIGS. 10 to 7 after the cover 500 is removed. 3, when the releasing paper 800 is removed from the induction range 200, as shown in FIG. 2, the releasing paper 800 is removed from the bag, Can be used for the range 400. The product contained in the container may be a product such as a ramen without a package, or it may be poured with boiling water. In this case, if both the first cover ribs 612 and the second cover ribs 622 are used while being tilted backward, the lid 500 can be coupled to the upper end of the wall, It is possible to cover the lid 500 and use it in the same manner as a cooking method in a generally known cup noodle.

The invention described above is susceptible to various modifications within the scope not impairing the basic idea. In other words, all of the above embodiments should be interpreted by way of example and not by way of limitation. Therefore, the scope of protection of the present invention should be determined in accordance with the appended claims rather than the above-described embodiments, and should be construed as falling within the scope of the present invention when the constituent elements defined in the appended claims are replaced by equivalents.

100: wall 110: bottom plate
112: bottom part 114: joint side
120: release paper 122: handle
130: cover 200: induction range
210: induction heating unit 300: food
400: gas range 500: cover
510: cover top surface 520:
600: wall 610: first wall surface
612: first cover rib 620: second wall surface
622: second cover rib 630: joint surface
631: first fold line 632: second fold line
633: third fold line 634: fourth fold line
635: Fifth fold line 636: Flex fold line
700: bottom plate 800: release sheet
810: Handle 900: Packaged food

Claims (15)

A wall having a hollow cylindrical wall surface and made of a paper material;
A metal bottom plate coupled to a lower end of the wall to close a lower portion of the wall and having a joining side joined to an outer surface of the wall, And
A separating plate which is detachably attached to the lower surface of the bottom plate and has a magnetic substance powder embedded therein,
Wherein the cooking vessel is a container for cooking.
The method according to claim 1,
And a cover which is invisible to the upper end of the wall.
3. The method according to claim 1 or 2,
The wall has a rectangular flat cross section, and the lower part of the wall forms a supporting part supported by the bottom surface on which the cooking container is mounted, and the upper part of the wall is provided inside A disposable cooking container which forms a folded fold.
The method of claim 3,
Wherein the wall has an upper light-tight narrowing shape such that a flat section of the folding section has a larger area than a flat section of the supporting section.
The method of claim 3,
A first lid rib protruding from a first wall surface of the wall surface facing each other to protect a product accommodated in the wall when the lid is first folded,
And a second cover rib that is folded opposite to a folding direction of the folding portion when the folding portion is folded secondarily so as to disperse the stress applied to the folding portion is protruded and formed on the second wall surface facing each other in the other direction among the wall faces, Vessel.
The method of claim 3,
Wherein a curved fold line is formed adjacent to each corner of the support portion and bent outward to form an obtuse angle in the corner portion.
The method of claim 3,
Wherein at least one surface of the wall is coated with a urethane-based resin, and the acryl-based resin is coated with a secondary coating.
8. The method of claim 7,
And a waterproof material is coated on the lower end of the wall in contact with the bottom surface of the bottom plate toward the thickness side.
The method of claim 3,
Wherein the bottom plate is made of a metal alloy containing aluminum or aluminum, and the inner surface of the bottom plate is coated with an acryl-based resin.
(a) forming a wall of a paper material having a hollow cylindrical wall;
(b) positioning a bottom plate of metal at the bottom of the wall to seal the bottom of the wall;
(c) bending the rim of the bottom plate upwardly to form a joining side;
(d) joining the inner surface of the joining side to the outer surface of the wall;
(e) embedding magnetic powder into a release paper having a shape corresponding to a bottom surface of the bottom plate; And
(f) adhering the release paper to the lower surface of the bottom plate so as to be detachable
Wherein the cooking cavity is formed of a metal plate.
11. The method of claim 10,
The step (a)
(a-1) first coating a urethane-based resin on both sides of a roll-shaped mother sheet;
(a-2) secondary coating an acrylic resin on both sides of the mother sheet;
(a-3) forming a cutting line along the outer shape of the wall on the mother sheet;
(a-4) cutting the mother sheet along the cutting line;
(a-5) coating a waterproof material along the cut surface in the step (a-4); And
(a-6) assembling the wall
Wherein the cooking cavity is formed of a metal plate.
12. The method of claim 11,
The wall has a rectangular flat cross section,
The step (a-3)
A support portion which is supported by the bottom surface of the wall and is supported by the bottom surface to which the cooking container is mounted and a folding portion which is folded inward to protect the product received in the upper portion of the wall, Wherein the step of forming the cooking cavity comprises the steps of:
13. The method of claim 12,
Wherein the wall has an upper light-tight narrowing shape so that a flat section of the folding section has a larger area than a flat section of the supporting section.
13. The method of claim 12,
Wherein the step (a-3) further comprises forming a curved fold line that is bent outward to form an obtuse angle in the corner portion adjacent to each corner of the support portion.
12. The method of claim 11,
The bottom plate is made of a metal alloy containing aluminum or aluminum,
Further comprising the step of coating an inner surface of the bottom plate with acrylic resin before the step (b).

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