Method for manufacturing kitchen container

Abstract

The present invention provides a method for manufacturing a kitchen container comprising the steps of: arranging a porous metal plate, which is manufactured by curing at different temperatures at least twice at predetermined time intervals so as to form pores ranging from 5% to 10% of the total surface area inside; forming a ceramic metal coating layer on at least one surface of the porous metal plate, which is manufactured such that the particle size of the powder is 30㎛ to 250㎛; forming a corrosion-preventing layer disposed on one surface of the metal coating layer; and performing a first firing at a temperature of 110℃ to 150℃ and a second firing at a temperature of 250℃ to 320℃.

Description

Technology Field

[0001] The present invention relates to a method for manufacturing kitchenware, and more specifically, to a method for manufacturing kitchenware with improved durability and functionality. Background Technology

[0003] Generally, kitchenware can be classified into those used for direct cooking, such as pots, frying pans, saucepans, and earthenware pots, which are made mainly of metal materials like iron, stainless steel, or aluminum and heat-resistant ceramic materials, and those used mainly for storing food to prevent spoilage or decay, such as food containers and bowls.

[0004] Aluminum is widely used as a metal material for kitchenware, along with carbon steel, cast iron, and stainless steel. Among these, aluminum accounts for approximately 50% of the total metal material usage due to its lighter weight compared to iron-based materials. Magnetic materials are required to manufacture induction-heating kitchenware. This is because when magnetic field lines generated from a coil pass through an induction-heating kitchenware, eddy currents are generated by the resistive components of the material composing the kitchenware. Since these eddy currents are converted into heat by the aforementioned resistive components, the kitchenware itself generates heat, enabling cooking. Induction heating in kitchenware containing metal occurs at specific frequencies, and typically, induction heating does not occur in aluminum kitchenware, which is a non-magnetic material. Therefore, a technical solution is required to apply induction heating to aluminum kitchenware, which is widely used due to its light weight. Kitchenware is typically manufactured as a final product by forming sheet metal and applying a Teflon or ceramic coating to the surface. Despite the advantages of high hardness and eco-friendliness, ceramic coatings present a problem in that their application to metal materials is limited due to their inherent porous structure. While ceramic coatings can be successfully applied to aluminum or titanium without cracking or corrosion issues because they form an oxide film, they pose difficulties when applied to corrosion-sensitive iron-based materials. Specifically, the porous structure of the ceramic coating layer provides pathways for corrosive substances (such as oxygen and chloride ions) to easily pass through. Consequently, when applied to steel, corrosion occurs, leading not only to cosmetic defects but also to functional degradation and delamination of the coating layer. Corrosive substances entering through the pores react with the steel to form iron oxides; these iron oxides expand in volume by more than three times, generating tensile stress in the ceramic coating layer and causing it to crack or delaminate. Prior art literature

[0005] Korean Patent Publication No. 10-1255330 (Published April 16, 2013) Korean Patent Publication No. 10-2091073 (Published March 19, 2020) The problem to be solved

[0006] The present invention has been devised to solve the aforementioned technical problem, and aims to provide a method for manufacturing a kitchen container that reduces the weight of the metal molded body of the kitchen container while ensuring durability through improved corrosion resistance against moisture, etc.

[0007] In addition, the present invention aims to provide a method for manufacturing a kitchen container that can prevent corrosion of the outer ceramic coating layer regardless of the type of metal plate.

[0008] The technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art to which the present invention belongs from the description below. means of solving the problem

[0010] To achieve the above objectives, one embodiment of the method for manufacturing a kitchen container according to the present invention is,

[0011] A step of placing a porous metal plate, manufactured by curing at different temperatures at least twice at predetermined time intervals so that pores ranging from 5% to 10% are formed inside, with respect to the total area;

[0012] A step of forming a ceramic metal coating layer on at least one surface of the porous metal plate, wherein the powder particle size is manufactured to be 30㎛ to 250㎛;

[0013] A step of forming a corrosion-preventing layer disposed on one surface of the metal coating layer; and

[0014] It may include a process of first firing at a temperature of 110℃ to 150℃ and second firing at a temperature of 250℃ to 320℃.

[0015] In one embodiment of the present invention, the porous metal plate is,

[0016] A first curing process of curing while increasing the temperature to -5℃ to 5℃ for 5 to 15 minutes; and

[0017] It may include a second curing process of curing while increasing the temperature at 25℃ to 35℃ for 10 to 20 minutes.

[0018] In one embodiment of the present invention, the corrosion-resistant layer may comprise a graphene sheet, a corrosion-resistant pigment, or a sacrificial metal selected from at least one of aluminum, chromium, zinc, beryllium, magnesium, alloys thereof, zinc phosphate, or combinations thereof. Effects of the invention

[0020] The method for manufacturing a kitchen container according to the present invention can provide the effect of reducing the weight of the metal molded body of the kitchen container while ensuring durability through improved corrosion resistance against moisture, etc.

[0021] In addition, the method for manufacturing a kitchen container according to the present invention can provide the effect of preventing corrosion of the outer ceramic coating layer regardless of the type of metal plate.

[0022] The effects of the present invention are not limited to the problems mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. Brief explanation of the drawing

[0024] FIG. 1 is a flowchart showing the manufacturing process of a method for manufacturing a kitchen container according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view of a kitchen container according to one embodiment of the present invention, and FIG. 3 shows product photos of kitchenware manufactured by a method for manufacturing kitchenware according to one embodiment of the present invention. Specific details for implementing the invention

[0025] Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiment of the present invention, if it is determined that a detailed description of related known configurations or functions would hinder understanding of the embodiment of the present invention, such detailed description is omitted.

[0026] In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by these terms. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0028] The method for manufacturing a kitchen container according to the present invention can provide the effect of reducing the weight of the metal molded body of the kitchen container, improving corrosion resistance against moisture, etc., and preventing corrosion of the outer ceramic coating layer regardless of the type of metal plate.

[0030] FIG. 1 shows a flowchart illustrating the manufacturing process of a method for manufacturing a kitchen container according to one embodiment of the present invention, FIG. 2 schematically shows a cross-sectional view of a kitchen container according to one embodiment of the present invention, and FIG. 3 shows product photographs of a kitchen container manufactured by the method for manufacturing a kitchen container according to one embodiment of the present invention.

[0031] Referring to these drawings, the method for manufacturing a kitchen container according to the present invention may include the steps of: placing a porous metal plate (200) that is manufactured by curing at different temperatures at least twice at predetermined time intervals so that pores ranging from 5% to 10% are formed on the entire surface (S100); forming a ceramic metal coating layer (100) on at least one surface of the porous metal plate (200) such that the powder particle size is 30㎛ to 250㎛ (S300); forming a corrosion-preventing layer (300) placed on one surface of the ceramic metal coating layer (100); and performing a first firing at a temperature of 110℃ to 150℃ and a second firing at a temperature of 250℃ to 320℃ (S500, S600).

[0032] Specifically, a process is first performed to prepare a porous metal plate (200) manufactured by curing at different temperatures at predetermined intervals at least twice so that pores ranging from approximately 5% to 10% are formed within the molded product over the entire surface area. Here, the metal plate (200) may be formed from a polymer material as a material constituting a kitchen container. The molded product may have its weight reduced by forming predetermined pores within it.

[0033] At this time, in one example, the metal plate (200) may be cured by a first curing process in which the temperature is raised to -5°C to 5°C for 5 to 15 minutes and cured by a second curing process in which the temperature is raised to 25°C to 35°C for 10 to 20 minutes. Preferably, the first curing process may be performed at a temperature of -2°C to 2°C for 7 to 12 minutes. Through these two-stage curing processes, pores having a predetermined diameter may be formed inside the metal plate (200).

[0034] Next, a process may be performed to form a ceramic metal coating layer (100) on both sides of the pore-formed metal plate (200), wherein the powder particle size is 30㎛ to 250㎛. It may be preferable for such a ceramic metal coating layer (100) to be formed on the upper and lower surfaces of the ceramic metal plate (200), respectively. External damage to the metal plate (200) can be prevented through the ceramic coating layer (100). In one example, the ceramic coating layer (100) may be manufactured to include one or more of SiO2, Al2O3, CaO, BaO, ZnO, K2O, Na2O, F, NiO, CoO, MnO2, or BeO, but is not limited thereto.

[0035] Next, according to the present invention, a process of forming a corrosion-preventing layer (300) disposed on one surface of the ceramic metal coating layer (100) may be performed. The corrosion-preventing layer (300) may be formed to prevent corrosion of the ceramic coating layer (100). Preferably, the ceramic coating layer (100) according to the present invention is suitable in the range of 50 μm to 100 μm. If the ceramic coating layer (100) is 50 μm or less, the desired corrosion resistance effect cannot be achieved, and if it exceeds 100 μm, the weight may increase unnecessarily and materials may be wasted.

[0036] According to the present invention, the method of forming the corrosion-preventing layer (300) may be performed using any one of vacuum deposition, sputtering, ion plating, arc ion plating, and molten aluminum plating, but is not limited to methods that are obvious in the technical field of the present invention.

[0037] In one example, the corrosion-resistant layer (300) may be a graphene sheet, and the corrosion-resistant pigment or sacrificial metal may be selected from aluminum, chromium, zinc, beryllium, magnesium, alloys thereof, zinc phosphate, or a combination thereof.

[0038] Finally, the molded product having the corrosion-preventing layer (300) formed thereon is first fired at a temperature of 110°C to 150°C and second fired at a temperature of 250°C to 320°C, and then molded into a desired shape to finally manufacture a kitchen container.

[0039] That is, the present invention enables the manufacture of a kitchen container that is lightweight and has improved durability by additionally forming the corrosion prevention layer (300) on a ceramic coating layer (100) where corrosion may occur, thereby fundamentally preventing corrosion while using the metal plate (200) in which pores are formed within a predetermined range.

[0041] Terms such as "include," "compose," or "have" as described above, unless specifically stated otherwise, mean that the relevant component may be inherent; therefore, they should be interpreted as allowing for the inclusion of additional components rather than excluding them. All terms, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains, unless otherwise defined. Commonly used terms, such as those defined in advance, should be interpreted in accordance with their meaning in the context of the relevant technology and should not be interpreted in an ideal or overly formal sense unless explicitly defined in the present invention.

[0043] For the time being, an embodiment of the present invention has been described in detail with reference to the attached drawings. However, the embodiments of the present invention are not necessarily limited to the above-described embodiment, and it is obvious that various modifications and implementations within an equivalent scope are possible by those skilled in the art to which the present invention pertains. Therefore, the true scope of the rights of the present invention shall be determined by the claims set forth below. Explanation of the symbols

[0045] 100: Ceramic metal coating layer 200: Porous metal plate layer 300: Anti-corrosion layer

Claims

Claim 1 A method for manufacturing a kitchenware, comprising: a step of placing a porous metal plate, manufactured by curing at different temperatures at least twice at predetermined time intervals so as to form pores ranging from 5% to 10% of the total surface area inside; a step of forming a ceramic metal coating layer on at least one surface of the porous metal plate, manufactured such that the powder particle size is 30㎛ to 250㎛; a step of forming an anti-corrosion layer disposed on one surface of the metal coating layer; and a process of first firing at a temperature of 110℃ to 150℃ and second firing at a temperature of 250℃ to 320℃. Claim 2 A method for manufacturing a kitchenware according to claim 1, wherein the porous metal plate is hardened by increasing the temperature to -5℃ to 5℃ for 5 to 15 minutes; and a second hardening process by increasing the temperature to 25℃ to 35℃ for 10 to 20 minutes. Claim 3 A method for manufacturing a kitchenware according to claim 1, wherein the corrosion-resistant layer is a graphene sheet, and the corrosion-resistant pigment or sacrificial metal is selected from aluminum, chromium, zinc, beryllium, magnesium, alloys thereof, zinc phosphate, or a combination thereof.

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