COOKING UTENSIL HAVING IMPROVED NON-STICK CHARACTERISTICS AND METHOD FOR MANUFACTURING SAME

Abstract

A cooking utensil according to the present invention includes a cooking utensil body A which is composed of a laminate including a metal substrate 1 and a fluorine resin film 2 laminated on the metal substrate 1, and the fluorine resin film 2 forms an inner surface of the cooking utensil body A, wherein the fluorine resin film 2 has a thickness 20 to 300 μm, a thickness deviation of 0.1 to 10 μm, and a surface roughness of 0.1 to 10 μm. The fluorine resin film 2 is manufactured by a casting method, a cutting method, a calender method, or an extrusion molding method, thereby having uniform thickness and surface roughness. The fluorine resin film 2 has the uniform thickness and surface roughness, thereby improving non-stick characteristics.

Claims

1. A cooking utensil having improved non-stick characteristics, comprising a cooking utensil body A which is composed of a laminate including a metal substrate 1 and a fluorine resin film 2 laminated on the metal substrate 1, and the fluorine resin film 2 forms an inner surface of the cooking utensil body A, wherein the fluorine resin film 2 has a thickness of 20 to 300 μm, a thickness deviation of 0.1 to 10 μm, and a surface roughness of 0.1 to 10 μm.

2. The cooking utensil having improved non-stick characteristics according to claim 1, wherein the fluorine resin film 2 has a single-layer structure including one layer.

3. The cooking utensil having improved non-stick characteristics according to claim 1, wherein the fluorine resin film 2 has a multi-layered structure including two or more layers.

4. The cooking utensil having improved non-stick characteristics according to claim 1, wherein the metal substrate 1 is made of one material selected from aluminum, an aluminum alloy, copper, magnesium, aluminum-plated steel, iron and stainless steel.

5. The cooking utensil having improved non-stick characteristics according to claim 1, wherein the metal substrate 1 has a form obtained by rolling two or more metal plates made of one material selected from aluminum, an aluminum alloy, iron, stainless steel and copper, and then mechanically joining the same.

6. The cooking utensil having improved non-stick characteristics according to claim 1, wherein the fluorine resin film is made of one or more selected from a group consisting of polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA), ethylene-tetrafluoroethylene copolymer (ETFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), tetrafluoroethylene-perfluoropropyl vinyl ether copolymer (TFM), polytetrafluoroethylene-perfluoromethyl vinyl ether copolymer (PFE/PMVE) and ethylene-chlorotrifluoroethylene copolymer (ECTEF).

7. The cooking utensil having improved non-stick characteristics according to claim 1, further comprising a cooking utensil handle B connected to the cooking utensil body A.

8. A method for manufacturing a cooking utensil having improved non-stick characteristics, comprising processes of: (i) pretreating a surface of a plate-shaped metal substrate 1; (ii) forming a fluorine resin film 2 by one method selected from a casting method, a cutting method, a calender method and an extrusion molding method; (iii) laminating the fluorine resin film 2 on the pretreated surface of the metal substrate 1 to prepare a laminate; (iv) cutting the laminate in which the fluorine resin film 2 is laminated on the metal substrate 1 in a desired form; (v) shaping the cut laminate in a form of the cooking utensil; and (vi) exterior surface treating the shaped cooking utensil.

9. The method for manufacturing a cooking utensil having improved non-stick characteristics according to claim 8, further comprising a process of attaching a handle to the exterior surface-treated cooking utensil.

10. The method for manufacturing a cooking utensil having improved non-stick characteristics according to claim 8, wherein, instead of preparing the laminate by laminating the fluorine resin film 2 on the pretreated surface of the metal substrate 1, a laminate is prepared by first cutting the metal substrate 1 having the pretreated surface in a desired form, then laminating the fluorine resin film 2 on the cut metal substrate 1.

11. The method for manufacturing a cooking utensil having improved non-stick characteristics according to claim 8, wherein the fluorine resin film 2 has a thickness of 20 to 300 μm, a thickness deviation of 0.1 to 10 μm, and a surface roughness of 0.1 to 10 μm.

12. The method for manufacturing a cooking utensil having improved non-stick characteristics according to claim 8, wherein the fluorine resin film 2 is made of polytetrafluoroethylene (PTFE).

Description

DESCRIPTION OF DRAWINGS

[0019] FIG. 1 is a schematic sectional view illustrating an example (frying pan) of a cooking utensil according to the present invention.

[0020] FIG. 2 is an enlarged cross-sectional view illustrating a cooking utensil body A according to the present invention.

[0021] FIGS. 3 to 4 are flowcharts illustrating processes of manufacturing the cooking utensil according to the present invention.

[0022] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

BEST MODE

[0023] As illustrated in FIGS. 1 and 2, the cooking utensil according to the present invention includes a cooking utensil body A which is composed of a laminate including a metal substrate 1 and a fluorine resin film 2 laminated on the metal substrate 1, and the fluorine resin film 2 forms an inner surface of the cooking utensil body A.

[0024] Optionally, the cooking utensil according to the present invention may further include a cooking utensil handle B connected to the cooking utensil body A, together with the cooking utensil body A.

[0025] The fluorine resin film 2 has a thickness deviation of 0.1 to 10 μm and a surface roughness of 0.1 to 10 μm. In other words, the thickness and the surface roughness of the resin film are uniformly controlled, such that it is possible to achieve characteristics (hereinafter referred to as “non-stick characteristics”) in which food cannot be stuck or adhered and burnt to the inner surface, even when used in cooking for a long period of time.

[0026] The present invention is characterized in that, in order to uniformly control the thickness and surface roughness of the fluorine resin film 2, the fluorine resin film 2 is formed by a casting method, a cutting method, a calender method, or an extrusion molding method.

[0027] The thickness of the fluorine resin film 2 is preferably from 20 to 300 μm in terms of improving durability and heat resistance, and the surface roughness is preferably from 0.1 to 10 μm in terms of improving the non-stick characteristics.

[0028] The fluorine resin film 2 may have a single-layer structure including one layer or a multi-layered structure including two or more layers.

[0029] The fluorine resin film 2 may be made of one or more selected from a group consisting of polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA), ethylene-tetrafluoroethylene copolymer (ETFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), tetrafluoroethylene-perfluoropropyl vinyl ether copolymer (TFM), polytetrafluoroethylene-perfluoromethyl vinyl ether copolymer (PFE/PMVE) and ethylene-chlorotrifluoroethylene copolymer (ECTEF), and it is preferable that the film is made of polytetrafluoroethylene (PTFE) in terms of improving heat resistance and durability.

[0030] Preferably, the metal substrate 1 is made of one material selected from aluminum, an aluminum alloy, copper, magnesium, aluminum-plated steel, iron and stainless steel.

[0031] The metal substrate 1 may have a form obtained by rolling two or more metal plates made of one material selected from aluminum, an aluminum alloy, iron, stainless steel and copper, and then mechanically joining the same.

[0032] Preferably, a metal oxide layer is formed on an outer surface of the cooking utensil body A, that is, on an exterior surface of the metal substrate 1.

[0033] As illustrated in FIG. 3, a method for manufacturing a cooking utensil according to the present invention includes processes of: (i) pretreating a surface of a plate-shaped metal substrate 1; (ii) forming a fluorine resin film 2 by one method selected from a casting method, a cutting method, a calender method and an extrusion molding method; (iii) laminating the fluorine resin film 2 on the pretreated surface of the metal substrate 1 to prepare a laminate; (iv) cutting the laminate in which the fluorine resin film 2 is laminated on the metal substrate 1 in a desired form; (v) shaping the cut laminate in a form of the cooking utensil; and (vi) exterior surface treating the shaped cooking utensil.

[0034] In another method for manufacturing a cooking utensil according to the present invention, as illustrated in FIG. 4, instead of preparing the laminate by laminating the fluorine resin film 2 on the pretreated surface of the metal substrate 1, it is possible to prepare a laminate by first cutting the metal substrate 1 having the pretreated surface in a desired form, then laminating the fluorine resin film 2 on the cut metal substrate 1.

[0035] The inventive method may further include a process of attaching a handle to the exterior surface-treated cooking utensil.

[0036] Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples.

Example 1

[0037] First, a multi-layered polytetrafluoroethylene (PTFE) film having a thickness deviation of 1.3 μm and a surface roughness of 0.65 μm was formed by a casting method.

[0038] Meanwhile, a surface of a plate-shaped metal substrate 1 was pretreated, and then a polytetrafluoroethylene (PTFE) film was laminated on the pretreated surface of the metal substrate 1 to prepare a laminate.

[0039] Next, the laminate was cut into a circular shape, then shaped into the form of a cooking utensil, and the shaped cooking utensil was subjected to exterior surface treatment to manufacture a cooking utensil body A.

[0040] Thereafter, a cooking utensil handle B was attached to the cooking utensil body A prepared as described above to manufacture a cooking utensil (frying pan) as illustrated in FIG. 1.

[0041] The thickness variation, surface roughness, and the number of allowable fried eggs of the fluorine resin film formed on an inner bottom surface of the manufactured cooking utensil (frying pan) were measured by the following evaluation methods, and the results thereof are listed in Table 1 below.

[0042] The manufactured cooking utensil (frying pan) was excellent in non-stick characteristics even when used in cooking for a long period of time, and no problems such as environmental pollution occurred during the manufacturing process.

Example 2

[0043] First, a polytetrafluoroethylene (PTFE) film having a thickness deviation of 4 μm and a surface roughness of 1.6 μm was formed by a cutting method.

[0044] Meanwhile, the surface of the plate-shaped metal substrate 1 was pretreated, subsequently cut into a circular shape, and then polytetrafluoroethylene (PTFE) was laminated thereon to prepare a laminate.

[0045] Next, the laminate was shaped into the form of a cooking utensil, and the shaped cooking utensil was subjected to exterior surface treatment to manufacture a cooking utensil body A.

[0046] Thereafter, a cooking utensil handle B was attached to the cooking utensil body A prepared as described above to manufacture a cooking utensil (frying pan) as illustrated in FIG. 1.

[0047] The thickness variation, surface roughness, and the number of allowable fried eggs of the fluorine resin film formed on an inner bottom surface of the manufactured cooking utensil (frying pan) were measured by the following evaluation methods, and the results thereof are listed in Table 1 below.

[0048] The manufactured cooking utensil (frying pan) was excellent in non-stick characteristics even when used in cooking for a long period of time, and no problems such as environmental pollution occurred during the manufacturing process.

Comparative Example 1

[0049] A plate-shaped metal substrate was cut into a circular shape, subsequently the surface of the metal substrate was pretreated, and then shaped into the form of the cooking utensil. Thereafter, the inner surface of the cooking utensil was subjected to coating with a fluorine resin coating solution (manufacturer DuPont) for a cooking utensil, which is well-known and used in the art, three times in an order of primer coating, under coating and top coating by a liquid spraying manner.

[0050] Next, the inner surface of the cooking utensil coated with a fluorine resin was subjected to exterior surface treatment to prepare a cooking utensil body.

[0051] Thereafter, a cooking utensil handle was attached to the cooking utensil body prepared as described above to manufacture a cooking utensil (frying pan).

[0052] The thickness variation, surface roughness, and the number of allowable fried eggs of the fluorine resin film formed on an inner bottom surface of the manufactured cooking utensil (frying pan) were measured by the following evaluation methods, and the results thereof are listed in Table 1 below.

[0053] Assessment Methods

[0054] [Measurement of Thickness Variation of Fluorine Resin Film]

[0055] A thickness of the fluorine resin film formed on the bottom of the frying pans manufactured through the above-described examples and comparative example was respectively measured in a direction from a bottom center to a circumference of the frying pan using a thickness measuring instrument (Fisher Co., Dual Scope).

[0056] [Measurement of Surface Roughness]

[0057] A surface roughness of the fluorine resin layer on the bottom of the frying pans manufactured through the above-described examples and comparative example was respectively measured using a surface profiler (KLA-Tencor Co., Alpha-Step IQ) at a length of 1000 μm.

[0058] [Evaluation for Release Properties of Fried Egg]

[0059] A surface temperature of the frying pans manufactured through the above-described examples and comparative examples was respectively heated to 180 to 210° C., and then fried eggs were prepared for 2 minutes in an absence of oil to evaluate a degree of non-stick characteristics.

TABLE-US-00001 TABLE 1 Comparative Item Example 1 Example 2 Example 1 Thickness variation 1.3 4.0 13 of fluorine resin film (μm) Surface roughness 0.65 1.6 25 of fluorine resin film (μm) The number of 300 times 300 times 112 times allowable fried or more or more or less eggs

[0060] As it can be clearly seen from Table 1, the cooking utensils manufactured in Examples 1 and 2 according to the present invention provided non-sticking properties superior to the cooking utensil coated with the fluorine resin by the liquid spray method well known in the art.

DESCRIPTION OF REFERENCE NUMERALS

[0061] A: cooking utensil body, [0062] B: cooking utensil handle [0063] 1: metal substrate, [0064] 2: fluorine resin film

INDUSTRIAL APPLICABILITY

[0065] The cooking utensil (frying pan) of the present invention may have improved non-stick characteristics as to be used for a fried egg, and the like.