WO2005122853A1

WO2005122853A1 - Gold-coated grill and method of preparing the same

Info

Publication number: WO2005122853A1
Application number: PCT/KR2005/001499
Authority: WO
Inventors: Gab-Tae Kim
Original assignee: Gab-Tae Kim
Priority date: 2004-06-15
Filing date: 2005-05-23
Publication date: 2005-12-29

Abstract

The present invention provides a gold-coated grill (heating cooker) and a process for the preparation thereof and more particularly, a gold-coated grill (heating cooker) which has a high heat conductivity and a chemically stable surface thereby reducing preheating time and gas consumption and enabling speedy cooking, renders meats to be evenly broiled, has no reaction between the cooker and oils that are generated while meats or vegetables are being cooked and prevents noxious substances to humans from being absorbed into meats during cooking, and a process for the preparation thereof, wherein the cooker comprises a grill (heating cooker) body comprising a thermally conductive metal and forming a certain face and a gold coating layer wherein the surface of the body is coated with the gold.

Description

Description GOLD-COATED GRILL AND METHOD OF PREPARNG THE SAME Technical Field

[1] The present invention relates to a gold-coated grill (heating cooker) and a method of preparing the same and more particularly, to a grill (heating cooker) including a grill pan and broiler that are used to broil or fry meats or vegetables and a process for the preparation thereof. In particular, the invention relates to a gold-coated grill (heating cooker) which has a high heat conductivity and a chemically stable surface thereby reducing preheating time and gas consumption and enabling speedy cooking, renders meats to be evenly broiled, has no reaction between the cooker and oils that are generated while meats or vegetables are being cooked and prevents noxious substances to humans from being absorbed into meats during cooking, and a process for the preparation thereof, wherein the cooker comprises a grill (heating cooker) body comprising a thermally conductive metal and forming a certain face and a gold coating layer wherein the surface of the body is coated with the gold. Background Art

[2] As grill pans or broilers, there have been widely used cauldron lids, stone pans, ceramic materials or metals such as stainless steel or brass strip. However, in case of cauldron lids, stone pans or ceramic materials, it takes long time to make the pans hot and thus they require long waiting time before cooking. In addition, no small fuels are consumed for such preheating, and increased room temperature resultant from the increased preheating time raises costs for cooling in summer. Furthermore, the temperature of grill pans is not uniform so that meats are not cooked evenly and some are early burned.

[3] Also, in case of the grill pans or broilers made of metal materials, the heat conductivity of known grill pans or broilers is not that high and in case of previous brass strip materials, there is a problem that meats may be contaminated with lead which is contained in the alloys of brass strip during cooking. In addition, food remnants are stuck to grill pan faces and such remnants are not readily washed out. Further, huge smokes are generated during cooking. Furthermore, meats, vegetables, or oils and soot generated by burned foods react with broilers or grill pans during cooking so that they may give rise to noxious substances to humans. Disclosure of Invention Technical Problem

[4] In order to solve the above-mentioned problems, it is an object of the present invention to provide a grill (heating cooker) including a grill pan or broiler which has short preheating time due to high heat conductivity, thus requires small energy consumption and enables cooking to be evenly made, and a method of preparing the same.

[5] Also, it is another object of the invention to provide a grill (heating cooker) which has high heat conductivity and at the same time, which is chemically stable so that it prevents the penetration of noxious substances into foods from the grill (heating cooker), the upper face of which food remnants are not stuck to, which is readily washable, and which has slight possibility that noxious substances to humans can be generated by the reaction of meats, vegetables, or oils and soot generated by burned foods with the cooker during cooking, and a method of preparing the same.

[6] Further, it is a still object of the invention to provide a grill (heating cooker) enabling cooking to be made under pleasant environment due to the generation of reduced smoke during cooking and a method of preparing the same. Technical Solution

[7] To achieve the aforementioned objects, the present invention provides a gold-coated grill (heating cooker) comprising:

[8] a grill (heating cooker) body comprising a thermally conductive metal and forming a certain face; and

[9] a gold coating layer wherein the surface of the body is coated with the gold.

[10] Also, the invention provides a process for preparing a gold-coated grill (heating cooker) comprising:

[11] forming a lamellar or netlike surface with a thermally conductive metal to obtain a grill (heating cooker) body; and

[12] coating the surface of the body with the gold. Advantageous Effects

[13] The present invention relating to a gold-coated grill (heating cooker) which comprises a body and a coating layer prepared by stable materials having high heat conductivity as well as involving no oxidation and a process for the preparation thereof shortens the preheating time of the cooker by virtue of high heat conductivity thereby enabling speedy cooking and increasing turnover rate in restaurants.

[14] Besides, the gas consumption during cooking can be saved at most 40% when compared with the prior consumption and according to the reduction of preheating time, reduced heat release makes rooms comparatively less hot and thus costs for cooling can be saved in summer.

[15] In addition, high heat conductivity enables cooking to be evenly made and makes cooking possible at low temperature so that oils are less spattered, oils readily come out of meat, meat has abundant juice, smoke is less generated, food materials are less burned and washing is thus easy.

[16] Further, the invention has high heat conductivity and at the same time it has a chemically stable gold coating layer whereby noxious components are not penetrated into foods from the grill (heating cooker) and in particular, the diffusion of noxious alloy components contained in the alloy of the body can be prevented. Also, as the surface of the grill (heating cooker) is stable, food remnants are not stuck to the upper face of the grill (heating cooker), which is thus readily washable as well as non- harmful to humans by decreasing a possibility that noxious substances to humans are generated by the reaction of meats, vegetables, or oils and soot generated by burned foods with the cooker during cooking.

[17] The invention is not limited by the detailed description of the invention and the appended drawings. It will be understood by those skilled in the pertinent art that other and further changes and modifications may be made without departing from the spirit and scope of the invention which is defined by the claims appended hereto. Brief Description of the Drawings

[18] Fig. 1 is a schematic sectional view of an embodiment of the gold-coated grill (heating cooker) of the present invention.

[19] Fig. 2 is a schematic sectional view of another embodiment of the gold-coated grill (heating cooker) of the invention.

[20] Fig. 3 is a perspective view of a grill pan which is one of the gold-coated grill (heating cooker)s of the invention.

[21] Fig. 4 is a perspective view of a broiler which is one of the gold-coated grill (heating cooker)s of the invention.

[22] Fig. 5 is a perspective view of another broiler which is one of the gold-coated grill (heating cooker)s of the invention.

[23] Fig. 6 is a schematic sectional view of an embodiment of the gold-coated grill (heating cooker) of the invention having a barrier layer.

[24] Fig. 7 is a schematic sectional view of another embodiment of the gold-coated grill (heating cooker) of the invention having a barrier layer.

[25] Fig. 8 is a schematic sectional view of an embodiment of the gold-coated grill (heating cooker) of the invention having a barrier layer and a transparent coating layer.

[26] Fig. 9 is a schematic sectional view of another embodiment of the gold-coated grill (heating cooker) of the invention having a barrier layer and a transparent coating layer.

[27] Fig. 10 is a schematic sectional view of still another embodiment of the gold-coated grill (heating cooker) of the invention having a barrier layer and a transparent coating layer. [28] < Main Reference Numerals >

[29] 10: body 15: barrier layer

[30] 20: gold coating layer 30: transparent coating layer Mode for the Invention

[31] The invention is further described in detail with reference to the drawings.

[32] The present invention relates to a gold-coated grill (heating cooker), which comprises a grill (heating cooker) body (10) comprising a thermally conductive metal and forming a certain face and a gold coating layer (20) wherein the surface of the body (10) is coated with the gold.

[33] The body (10) in the gold-coated grill (heating cooker) comprises a thermally conductive metal. The thermally conductive metal refers to known various metals with thermal conductivity and heat resistance and there can be used a variety of metals that are used in previous kitchen wares for cooking. Preferably, it is selected from the group consisting of a copper, copper alloy, iron, iron alloy, aluminum, aluminum alloy, nickel silver, silver (Ag) and silver (Ag) alloy. Thus, silver and silver alloys that have high heat conductivity can be used and next, pure copper or its alloys can be used. If the body (10) comprises copper or its alloys, the grill (heating cooker) is readily heated because copper (Cu) has high heat conductivity right after Ag. However, the use of a variety of metal materials which has lower heat conductivity than copper but still has heat conductivity above a certain level is possible and for example, irons and iron alloys and alloy steels or stainless steels can be employed and besides, aluminum, various aluminum alloys or nickel silvers (copper-nickel-zinc based alloy) can be used. More preferably, copper or its alloys are used because they are advantageous in aspect of heat conductivity, intensity and costs.

[34] For the alloys, a variety of known alloys can be used and particularly, in case of copper alloys, the alloys preferably comprise copper in an amount of at least 55 % by weight and as such an example, red brass strip or brass strip can be mentioned. More preferably, an alloy of 65 to 70 % by weight of copper and 30 to 35 % by weight of zinc is used.

[35] The grill (heating cooker) body (10) comprising the thermally conductive metal can be made into a variety of configurations enabling grill or fry and for this purpose, it should form a certain face. The face does not need to be a plane and if desired, it can constitute such shapes as curved surface, cowl surface, concave surface, convex surface and further constitute netlike surfaces. In particular, in case of grill pans or roast pans, the metal of the body (10) may constitute lamellar surfaces and the thickness of the grill pans is preferably 2 to 5 mm and more preferably 3 to 4 mm. Also, in case of broilers, netlike structure may constitute the certain face configuration and the thickness of each wire in the netlike structure is preferably 1 to 5 mm.

[36] The surface of the body (10) is coated with gold and there can be used not only pure gold (24K) but also a variety of gold or its alloys such as 18K, 14K, etc. However, in consideration of chemical stability and influence on humans, the use of pure gold is advisable. In an embodiment, as shown in Fig. 1 and Fig. 2, gold can be coated onto the upper face of the body (10) or its entire face (including upper and lower face). In other words, only the upper face which is in direct contact with meats which are to be cooked may be coated or as an alternative, gold coating can be carried out against the overall surface of the grill (heating cooker). By virtue of the use of gold that has high heat conductivity as a coating material, the reduction of heat conductivity resultant from the addition of coating layers to the body (10) can be minimized and it is possible to obtain a surface that is chemically very stable and non-harmful to humans while oxidation hardly occurs.

[37] The gold coating layer (20a, 20b, 20c) can be prepared by a variety of known coating methods. Preferably, in consideration of ease of fabrication, plating may be carried out using electroplating or electroless plating and more preferably, miller plating method is used in aspect of appearance and adhesion. Also, the plating may be carried out only once, but to reduce the peeling-off of the plating surface while the grill (heating cooker) is being washed and secure the coating surface, the gold coating is preferably carried out through 2 to 5 distinct plating procedures so that the gold coating layer (20) can consist of multiple coating layers of 2 to 5 distinct gold-plated layers. More preferably, in consideration of solidity and costs, the gold coating layer (20) consists of three plating layers. Detailed embodiments are shown in Fig. 1 and Fig. 2, and the gold coating layers (20a, 20b, 20c) consist of three coating layers.

[38] The thickness of the gold coating layer (20) can be suitably adjusted according to its use within a range of 0.01 to 5 D. The total coating thickness of 0.5 to 2 D is preferable in aspect of the intensity of the coating layers and costs.

[39] As specific examples of the grill (heating cooker), there can be mentioned a variety of kitchen wares for cooking including grill pans, broilers, roast pans, fry pans, pots (including casserole pots) and steel roast pans. The grill pans encompass known grill pans and particularly, they refer to grill pans having lamellar structure as shown in Fig. 3. In case of the broilers, they refer to known netlike structures with holes wherein wires are simply arranged in a row or cross connected as shown in Fig. 4 and Fig. 5.

[40] Further the gold-coated grill (heating cooker) may further a diffusion barrier layer between the body (10) and the gold coating layer (20) to prevent the atoms of the gold coating layer from being diffused into the body and preferably, the barrier layer (15) comprises nickel or its alloy which has excellent anti-diffusion ability. In general, if thermally conductive metals including copper or iron that are plated with gold are exposed to high temperature for a long time, gold atoms tend to diffuse into the structure of the thermally conductive metals of copper or iron. Accordingly, in order to prevent such diffusion, a diffusion barrier layer is placed at the middle and it is common to use nickel that has high atomic weight or its alloys so as to block diffusion. Hence, as shown in Fig. 6 and Fig. 7, the barrier layer (15) is optionally applied between the body (10) of the thermally conductive metal and gold coating layer (20).

[41] In addition, the gold-coated grill (heating cooker) of the invention may further comprise a clear transparent coating layer (30) on the gold coating layer (20). This layer is to protect the gold coating layer (20) and it is prepared by dipping or spray coating Quartz or Teflon and thereby obtaining a chemically stable coating layer. Clear coatings are preferred to show the expensive color of the gold coating layer (20) itself outside. Specifically, as shown in Figs. 8 to 10, the transparent coating layer (30) can be selectively applied with regard to the gold coating layer at need.

[42] Also, the present invention provides a process for preparing the gold-coated grill (heating cooker). In case of that the gold-coated grill (heating cooker)s are lamellar structures such as grill pans, the process can comprise forming a certain lamellar face to obtain a grill (heating cooker) body and coating the surface of the body with gold, and in case that they are netlike structures such as broilers, the process can comprise forming a certain netlike face using a thermally conductive metal such as a wire or a rod thereby to obtain a grill (heating cooker) body and coating the surface of the body with gold.

[43] For the thermally conductive metal, the aforementioned alloys can be employed, and as gold coating method, a variety of known coating methods can be applied but in consideration of the ease of application and costs, electroplating or electroless plating is preferable and more preferably, miller plating method can be employed. In addition, in order to secure the coating face as described above, the plating process is preferably carried out by 2 to 5 distinct plating procedures so as to constitute multiple coating layers and more preferably, plating is carried out three times.

[44] Further, the process for the preparation of the gold-coated grill (heating cooker) may further comprise a step of forming a barrier layer (15) comprising nickel or its alloy before the formation of the gold coating layer (20) or a step of coating a transparent coating on the gold coating layer (20) after the formation of the gold coating layer (20), or both steps.

[45] In other words, the process may further selectively comprise a step of coating nickel or its alloy on the body (10) between the body (10) formation step and the gold coating step, or a step of coating a transparent coating on the gold coating layer (20), or both. Industrial Applicability [46] The present invention relating to a gold-coated grill (heating cooker) which comprises a body and a coating layer prepared by stable materials having high heat conductivity as well as involving no oxidation and a process for the preparation thereof shortens the preheating time of the cooker by virtue of high heat conductivity thereby enabling speedy cooking and increasing turnover rate in restaurants.

[47] Besides, the gas consumption during cooking can be saved at most 40% when compared with the prior consumption and according to the reduction of preheating time, reduced heat release makes rooms comparatively less hot and thus costs for cooling can be saved in summer.

[48] In addition, high heat conductivity enables cooking to be evenly made and makes cooking possible at low temperature so that oils are less spattered, oils readily come out of meat, meat has abundant juice, smoke is less generated, food materials are less burned and washing is thus easy.

[49] Further, the invention has high heat conductivity and at the same time it has a chemically stable gold coating layer whereby noxious components are not penetrated into foods from the grill (heating cooker) and in particular, the diffusion of noxious alloy components contained in the alloy of the body can be prevented. Also, as the surface of the grill (heating cooker) is stable, food remnants are not stuck to the upper face of the grill (heating cooker), which is thus readily washable as well as non- harmful to humans by decreasing a possibility that noxious substances to humans are generated by the reaction of meats, vegetables, or oils and soot generated by burned foods with the cooker during cooking.

[50] The invention is not limited by the detailed description of the invention and the appended drawings. It will be understood by those skilled in the pertinent art that other and further changes and modifications may be made without departing from the spirit and scope of the invention which is defined by the claims appended hereto.

Claims

[I] A gold-coated grill (heating cooker) comprising: a grill (heating cooker) body comprising a thermally conductive metal and forming a certain face; and a gold coating layer wherein the surface of the body is coated with the gold. [2] The gold-coated grill (heating cooker) according to claim 1 wherein the thermally conductive metal is selected from the group consisting of a copper, copper alloy, iron, iron alloy, aluminum, aluminum alloy, nickel silver, silver (Ag) and silver (Ag) alloy. [3] The gold-coated grill (heating cooker) according to claim 1 wherein the thermally conductive metal is a copper alloy of 65 to 70 % by weight of copper and 30 to 35 % by weight of zinc and the gold coating layer is formed by coating a pure gold in a thickness of 0.5 to 2 D. [4] The gold-coated grill (heating cooker) according to claim 1 wherein the gold coating layer is a multiple coating layer comprising 2 to 5 distinct gold-plated layers. [5] The gold-coated grill (heating cooker) according to claim 1 further comprising a barrier layer between the body and the gold coating layer, the barrier layer comprising a nickel or its alloy. [6] The gold-coated grill (heating cooker) according to claim 1 further comprising a clear transparent coating layer on the gold coating layer. [7] The gold-coated grill (heating cooker) according to claim 1 wherein the gri_(heating cooker) comprises a grill pan, broiler, roast pan, fry pan, pot and steel roast pan. [8] A process for preparing a gold-coated grill (heating cooker) comprising: forming a lamellar or netlike surface with a thermally conductive metal to obtain a grill (heating cooker) body; and coating the surface of the body with the gold. [9] The process for preparing the gold-coated grill (heating cooker) according to claim 8 wherein the thermally conductive metal is selected from the group consisting of a copper, copper alloy, iron, iron alloy, aluminum, aluminum alloy, nickel silver, silver (Ag) and silver (Ag) alloy. [10] The process for preparing the gold-coated grill (heating cooker) according to claim 8 wherein the thermally conductive metal is a copper alloy of 65 to 70 % by weight of copper and 30 to 35 % by weight of zinc and the gold coating layer is formed by coating a pure gold in a thickness of 0.5 to 2 D.

[II] The process for preparing the gold-coated grill (heating cooker) according to claim 8 wherein the gold coating is carried out by 2 to 5 distinct plating processes. [12] The process for preparing the gold-coated grill (heating cooker) according to claim 8 further comprising plating a nickel or its alloy on the body between the body formation step and the gold coating step. [13] The process for preparing the gold-coated grill (heating cooker) according to claim 8 further comprising coating a transparent coating on the gold coating layer. [14] The process for preparing the gold-coated grill (heating cooker) according to claim 8 wherein the gri_(heating cooker) comprises a grill pan, broiler, roast pan, fry pan, pot and steel roast pan.