Cooking products with non-slip outer coating

Abstract

This invention relates to a cooking article (1) comprising a carrier (2) having a bottom wall (21) and side walls (31) rising around the bottom wall (21), the bottom wall (21) having an inner surface (211) for receiving food and an outer surface (212) for placement near a heat source, the side walls (31) having an inner surface (311) and an outer surface (312), characterized in that the outer surfaces (212) and (312) are covered with at least one continuous primer layer comprising at least one fluoropolymer, the coating of the outer surface (212) comprising at least one finish disposed between or within the layers thereon, the finish covering at least 20% of the surface of the outer surface (212), the finish comprising at least one fluoropolymer, at least one polymer resin and 5-25% by weight of mineral filler and / or polymer filler in the form of particles with a size d50 of less than 25 μm. The invention also relates to a method for manufacturing such an article.

Description

Technical Field

[0001] This invention relates to a cooking article having a coating on its outer surface that improves its anti-slip properties. The invention also relates to a method of manufacturing such an article. Background Technology

[0002] With the development of glass, induction, and glass-ceramic cooktops with smooth and glossy surfaces, safety concerns have arisen. The main problem stems from cooking food slipping off the cooktop when placed on the burner, posing a risk to users of spilled food, potential injury, or even burns.

[0003] Furthermore, the outer coating of cooking utensils is primarily composed of PTFE, which has the disadvantage of promoting slippage on the cooktop, increasing the risk of accidents. The term "promotes slippage" refers to the ability of cooking utensils to not remain in place on the heated cooktop. This characteristic relates to the static and dynamic coefficients of slip of the layer in contact with the cooktop, and therefore to the cooktop. For safety reasons, sensitivity to slippage must be minimized.

[0004] Depending on the method of applying the outer coating, cooking product manufacturers have implemented technologies to limit this phenomenon.

[0005] In screen printing, an unapplied metal strip is left on the bottom of the part at the span. This unapplied aluminum portion allows for limited slippage, but its efficiency is highly dependent on the concavity of the part. Furthermore, this metal strip is prone to contaminating the glass-ceramic cooktop.

[0006] During application by roller or spray, an external PTFE and alumina-based finish is applied under the last two layers of roller polishing. This layer provides a non-slip effect but has the disadvantage of scratching the furnace tray.

[0007] Other materials, such as silicone, are also used to provide anti-slip properties. Unfortunately, these materials cannot withstand the temperatures of cooked foods, such as continuous cooking at temperatures above 200°C.

[0008] Therefore, there is a need to provide cooking utensils that limit slippage, especially when they are placed on smooth surfaces, such as stovetops, to avoid household accidents and to prevent scratches and contamination of the carriers on which the utensils are placed. Summary of the Invention

[0009] To overcome the aforementioned drawbacks, the applicant has developed a cooking product whose outer surface is covered with an anti-slip coating to limit slippage on the stovetop, while reducing or even eliminating scratches and stains on the carrier on which the product is placed. The applicant has also developed a method for manufacturing the cooking product.

[0010] The first object of the present invention relates to a cooking article 1, comprising a carrier 2 having a bottom wall 21 and a side wall 31 rising around the bottom wall 21, the bottom wall 21 having an inner surface 211 for receiving food and an outer surface 212 for being positioned close to a heat source, the side wall 31 having an inner surface 311 and an outer surface 312, characterized in that:

[0011] - The outer surfaces 212 and 312 are covered with at least one continuous primer layer, the continuous primer layer comprising at least one fluorocarbon polymer;

[0012] - The coating of the outer surface 212 includes at least one finish disposed between or within its layers, the finish covering at least 20% of the surface of the outer surface 212, the finish comprising:

[0013] • At least one fluorocarbon polymer;

[0014] • At least one polymer resin;

[0015] • 5-25% by weight of mineral fillers and / or polymer fillers in the form of particles with a d50 size of less than 25 μm.

[0016] Another object of the present invention relates to a method for manufacturing a cooking article of the present invention, the cooking article comprising a carrier 2 having a bottom wall 21 and a side wall 31 rising around the bottom wall 21, the bottom wall 21 having an inner surface 211 for receiving food and an outer surface 212 for being positioned close to a heat source, the side wall 31 having an inner surface 311 and an outer surface 312, the method comprising the following steps:

[0017] - Provide carrier 2;

[0018] - Apply at least one primer layer containing at least one fluorocarbon polymer to the outer surfaces 212 and 312 of the carrier 2;

[0019] - Apply at least one finish to at least 20% of the surface of the outer surface 212, the finish comprising at least one fluoropolymer, at least one polymer resin and 5-25% by weight of mineral filler and / or polymer filler, the mineral filler and / or polymer filler being in the form of particles with a d50 size of less than 25 μm;

[0020] - The cooked product is cured in the oven for 1 to 15 minutes at a temperature between 400°C and 450°C.

[0021] definition

[0022] Within the meaning of this invention, the term "layer" should be understood to refer to a continuous or discontinuous layer. A continuous layer (or also called a monolithic layer) is a single, integral unit that completely covers the surface on which it is placed. A discontinuous layer (or non-monolithic layer) may comprise several parts and is therefore not a single, integral unit.

[0023] The terms “primer layer,” “adhesive layer,” or “adhesive primer” should be understood to refer to all layers from the first layer applied directly to the carrier to the last layer before the first finishing layer, the first layer being either mechanically prepared or treated with a sub-layer (preferably, this layer adheres well to the carrier and imparts all its mechanical properties to the coating: hardness, scratch resistance).

[0024] The term "intermediate layer" should be understood to refer to any layer between the primer layer and the topcoat layer.

[0025] Within the meaning of this invention, the term "finish" or "finishing layer" should be understood to refer to one or more continuous or discontinuous layers comprising mineral fillers and / or polymer fillers. Due to the presence of pigments and / or fillers that create protrusions, roughness, and are visible to the naked eye, the finish is clearly visible to the user at the standard usage distance of a household article.

[0026] The term "topcoat" or "coating" should be understood as a continuous and transparent surface layer that leaves perfect visibility of the underlying layers while protecting them from mechanical erosion and giving the coating its non-stick properties. The topcoat is the last layer applied.

[0027] Within the meaning of this invention, "cooking article" should be understood as an object intended for use in cooking. For this purpose, it is intended to undergo heat treatment.

[0028] Within the meaning of this invention, "object for receiving heat treatment" should be understood as an object that is heated by an external heating system, such as a frying pan, a pan with a handle, a skillet, a wok, a pancake pan, a kettle, a cooking pot, a pressure cooker, a stew pot, a barbecue grill, a pastry mold, a cheese fondue, and that is capable of transferring the heat energy provided by the external heating system to the material or food in contact with the object.

[0029] The term "particle" should be understood to refer to small-sized elements of random shape, characterized in particular by their d50.

[0030] Within the meaning of this invention, "d50" should be understood as the size such that 50% by volume of the population consists of particles smaller than the stated size (the median of the particle distribution). The term "size" should be understood as the equivalent diameter, i.e., the diameter that a theoretical sphere would have, expressed in the same way as the particles under discussion. Attached Figure Description

[0031] Figure 1 A schematic diagram showing a cooking product according to the present invention.

[0032] The figure specifically shows a frying pan 1 with a handle 11 as an example of a cooking product, which includes a carrier 2 having a bottom wall 21 and a side wall 31 rising around the bottom wall 21, the bottom wall 21 having an inner surface 211 for holding food and an outer surface 212 for being positioned close to a heat source, and the side wall 31 having an inner surface 311 and an outer surface 312.

[0033] The outer surfaces 212 and 312 are covered with at least one continuous primer layer 4 comprising at least one fluoropolymer, and the coating of the outer surface 212 comprises at least one finish 5 disposed between or within its layers.

[0034] Figure 2 A schematic diagram showing the outer surfaces 212 and 312 of the cooking article according to the present invention.

[0035] The figure shows a frying pan 1 with a handle 11 as an example of a cooking product. The outer surfaces 212 and 312 of the frying pan are covered with at least one primer layer 4, and the outer surface 212 of the frying pan is coated with a finish 5. Detailed Implementation

[0036] The first object of the present invention relates to a cooking article 1, comprising a carrier 2 having a bottom wall 21 and a side wall 31 rising around the bottom wall 21, the bottom wall 21 having an inner surface 211 for receiving food and an outer surface 212 for being positioned close to a heat source, the side wall 31 having an inner surface 311 and an outer surface 312, characterized in that:

[0037] - The outer surfaces 212 and 312 are covered with at least one continuous primer layer, the continuous primer layer comprising at least one fluorocarbon polymer;

[0038] - The coating of the outer surface 212 includes at least one finish disposed between or within its layers, the finish covering at least 20% of the surface of the outer surface 212, the finish comprising:

[0039] • At least one fluorocarbon polymer;

[0040] • At least one polymer resin;

[0041] • 5-25% by weight of mineral fillers and / or polymer fillers in the form of particles with a d50 size of less than 25 μm.

[0042] Advantageously, the article is a cooking article, wherein one surface of the carrier is configured as a concave inner surface for contact with food placed inside the article, and another surface of the carrier is configured as a convex outer surface for contact with a heat source.

[0043] The cooking products according to the present invention are preferably selected from the group consisting of a pan with a handle, a frying pan, a stewing pan, a wok, a frying pan, a pancake pan, a cooking pot, and a pressure cooker.

[0044] In the application fields considered in this invention, cooking products are typically used in a temperature range between 10°C and 300°C.

[0045] The carrier contains at least one element selected from ceramics, glass, tungsten-chromium-cobalt alloys, metal alloys, or metals, particularly aluminum, copper, titanium, or zirconium. The carrier is preferably metallic.

[0046] As a metal carrier that can be used in the context of this invention for cooking products, a carrier having the following characteristics can be specifically mentioned:

[0047] - A single-layer structure made of anodized or non-anodized aluminum, or chemically treated aluminum that has been polished, brushed, sandblasted, or micro-shaped, or cast aluminum, or steel that has been polished, brushed, sandblasted, or micro-blasted, or stainless steel that has been polished, brushed, sandblasted, or micro-blasted, or cast steel, aluminum, or iron, or copper, optionally hammered or polished; or

[0048] - A multi-layered structure, comprising, in part or in part, the following layers from the outside in: stainless steel / aluminum / stainless steel or stainless steel / aluminum / copper / aluminum / stainless steel, or a cap of cast aluminum, aluminum or aluminum alloy with a stainless steel outer bottom.

[0049] To improve the adhesion of the coating, the surface of the carrier can be treated, for example by sandblasting, to increase its specific surface area.

[0050] The outer surfaces 212 and 312 of the bottom wall 21 of the cooking article are covered with at least one primer layer. When the primer layer is applied to a pre-formed cooking article, the outer surfaces 212 and 312 of the bottom wall 21 are preferably covered with a single primer layer. When the primer layer is applied to a non-pre-formed cooking article in a flat manner, the outer surfaces 212 and 312 of the bottom wall 21 are preferably covered with two primer layers.

[0051] Advantageously, the thickness of each primer layer is less than 20 μm, preferably less than or equal to 15 μm.

[0052] Preferably, the thickness of the first primer layer is 5 μm to 15 μm, and particularly preferably 10 μm.

[0053] Preferably, the thickness of the second primer layer is 10 μm to 20 μm, and particularly preferably 15 μm.

[0054] In the case of several primer layers, at least one of them must be continuous. If there is only one primer layer, then that primer layer is continuous.

[0055] Fluoropolymers can be selected from polytetrafluoroethylene (PTFE), modified PTFE, copolymers of tetrafluoroethylene and perfluoropropyl vinyl ether (PFA), copolymers of tetrafluoroethylene and hexafluoropropylene (FEP), polyvinylidene fluoride (PVDF), copolymers of tetrafluoroethylene and polymethyl vinyl ether (MVA), terpolymers of tetrafluoroethylene, polymethyl vinyl ether and fluoroalkyl vinyl ether (TFE / PMVE / FAVE), ethylene tetrafluoroethylene (ETFE), and mixtures thereof.

[0056] Advantageously, the fluoropolymer may be selected from polytetrafluoroethylene (PTFE), or a mixture of PTFE and PFA (PTFE / PFA), or a mixture of PTFE and FEP (PTFE / FEP), or a mixture of PTFE, PFA and FEP (PTFE / PFA / FEP).

[0057] Particularly preferred is the fluoropolymer PTFE.

[0058] Advantageously, the proportion of fluoropolymer in each primer layer is 30-80%, preferably 40-70% dry weight, relative to the total weight of the primer layer.

[0059] The primer layer (one or more) may contain an adhesive resin, especially when the carrier has undergone mechanical treatment.

[0060] Preferably, the adhesive resin is selected from polyamide-imide (PAI), polyether-imide (PEI), polyamide (PA), polyimide (PI), polyether ketone (PEK), polyether ether ketone (PEEK), polyarylether ketone (PAEK), polyether sulfone (PES), polyphenylene sulfide (PPS), polybenzimidazole (PBI), and tannic acid.

[0061] The finish covers at least 20% of the surface of the outer surface 212 of the bottom wall 21, preferably at least 30%, and even more preferably at least 30%.

[0062] Advantageously, the finish occupies less than 50% of the surface of the outer surface 212 of the base wall 21, or even more advantageously, less than 40%.

[0063] The finish comprises at least one fluorocarbon polymer selected from the following: polytetrafluoroethylene (PTFE), modified PTFE, copolymers of tetrafluoroethylene and perfluoropropyl vinyl ether (PFA), copolymers of tetrafluoroethylene and hexafluoropropylene (FEP), polyvinylidene fluoride (PVDF), copolymers of tetrafluoroethylene and polymethyl vinyl ether (MVA), terpolymers of tetrafluoroethylene, polymethyl vinyl ether and fluoroalkyl vinyl ether (TFE / PMVE / FAVE), ethylene tetrafluoroethylene (ETFE), and mixtures thereof.

[0064] Advantageously, the fluoropolymer of the finishing layer may be selected from polytetrafluoroethylene (PTFE), or a mixture of PTFE and PFA (PTFE / PFA), or a mixture of PTFE and FEP (PTFE / FEP), or a mixture of PTFE, PFA and FEP (PTFE / PFA / FEP).

[0065] Particularly preferred is that the fluoropolymer of the finishing layer is PTFE.

[0066] Advantageously, the proportion of fluoropolymer in the finishing layer, on a dry weight basis, is between 30% and 80% relative to the total weight of the finishing layer, preferably between 40% and 70%, and even more preferably between 30% and 60%.

[0067] The finish comprises at least one polymer resin selected from polyamide-imide (PAI), polyether-imide (PEI), polyamide (PI), polyetherketone (PEK), polyetheretherketone (PEEK), polyether sulfide (PES), polyphenylene sulfide (PPS), and mixtures thereof. Preferably, the polymer resin is selected from polyamide-imide (PAI).

[0068] Preferably, the proportion of polymer resin in the finishing layer is between 0.5% and 3%, more preferably between 1% and 1.5%, relative to the total weight of the finishing layer, calculated on a dry weight basis.

[0069] Advantageously, the finish comprises a ratio between a polymeric resin and a fluoropolymer, wherein the ratio is between 1.5 and 5, preferably 2.

[0070] Advantageously, the thickness of each finishing layer is less than 20 μm, preferably less than or equal to 15 μm, and even more preferably less than or equal to 10 μm.

[0071] According to one embodiment, the finish comprises a mineral filler selected from glass, stainless steel, alumina, boron nitride, talc, kaolin, or mixtures thereof.

[0072] According to another embodiment, the finish comprises a polymer filler selected from polyaryletherketone, polyimide, polyphenylene sulfide, and mixtures thereof.

[0073] Finishes may include a mixture of mineral fillers and polymer fillers.

[0074] The finish contains 5-25% by weight, preferably 10-20% by weight, of mineral fillers and / or polymer fillers.

[0075] The mineral filler and / or polymer filler are in the form of particles with a d50 size of less than 25 μm, preferably less than 20 μm.

[0076] Preferably, the mineral filler and / or polymer filler are in the form of particles with a d50 size greater than 5 μm, and more preferably with a d50 size greater than 10 μm.

[0077] Advantageously, the mineral packing and / or polymer packing is spherical.

[0078] Electron microscopy can be used to evaluate the dimensions in the finishing layer, thus assessing the d50 size and the filler concentration.

[0079] Preferably, the mineral filler and polymer filler have a Mohs hardness of less than or equal to 5.5. The Mohs scale used to measure mineral hardness is a nominal scale. Therefore, the measurement of Mohs hardness is based on the ability of a mineral to scratch a secondary mineral. Thus, a mineral with a Mohs hardness of less than or equal to 5.5 (equivalent to the Mohs hardness value of window glass) can be scratched by any mineral with a Mohs hardness greater than 5.5, such as orthoclase (Mohs hardness of 6).

[0080] Advantageously, the finish may contain one or more pigments, such as titanium dioxide, ferrous oxide (FeO), iron oxide (Fe2O3), carbon black, Pilan red, metallic glitter, mixed oxides of cobalt and manganese, blue pigments based on mica and titanium dioxide, and mixtures thereof.

[0081] Preferably, the finish may include additives, such as dispersants, spreaders, defoamers, and thickeners.

[0082] The finish can be applied between two coats of primer or on the last coat of primer.

[0083] Preferably, the finishing layer is discontinuous.

[0084] Advantageously, the finishing layer is rough, having a rough surface due to the presence of mineral fillers and / or polymer fillers. Advantageously, the finishing layer is visible to the naked eye.

[0085] Preferably, the final finishing layer is in contact with the heat source.

[0086] According to one embodiment, one or more finishing layers are applied to the final intermediate layer or the final primer layer. Preferably, the topcoat layer comprises one or more fluoropolymers.

[0087] Advantageously, the finishing layer comprises one or more heat-stabilized resins.

[0088] Preferably, the finishing layer applied to the bottom of the cooked product is transparent.

[0089] Preferably, the finishing layer is continuous.

[0090] Another object of the present invention relates to a method of manufacturing a cooking article comprising a carrier (2) having a bottom wall (21) and a side wall (31) rising around the bottom wall (21), the bottom wall (21) having an inner surface (211) for receiving food and an outer surface (212) for placement near a heat source, the side wall (31) having an inner surface (311) and an outer surface (312), the method comprising the following steps:

[0091] - Provide a carrier (2);

[0092] - Apply at least one primer layer containing at least one fluorocarbon polymer to the outer surfaces (212) and (312) of the carrier (2);

[0093] - Apply at least one finish to at least 20% of the surface of the outer surface (212), the finish comprising at least one fluoropolymer, at least one polymer resin and 5-25% by weight of mineral filler and / or polymer filler, the mineral filler and / or polymer filler being in the form of particles with a d50 size of less than 25 μm;

[0094] - The cooked product is cured in the oven for 1 to 15 minutes at a temperature between 400°C and 450°C.

[0095] Preferably, the carrier may undergo surface treatment to improve the adhesion of the primer layer, such as chemical treatment (pickling) or mechanical treatment, such as by sandblasting or by brushing. Advantageously, a degreasing step and / or dust removal step may follow the surface treatment.

[0096] The carrier can also undergo a micro-blasting process on the outer surface 212 of the bottom wall 21.

[0097] The primer layer can be applied by any method known to those skilled in the art, such as by spraying, by roller, by screen printing, by curtain coating or by pad printing.

[0098] When applying a primer layer via screen printing or rollers, a drying step is performed.

[0099] Alternatively, the drying step can be performed after the primer layer has been applied by spraying.

[0100] The drying step allows for limiting or even eliminating the formation of defects in the coating, such as bubbles or cracks, during the curing step.

[0101] When applying a primer layer via screen printing, a cooling step is performed after the drying step.

[0102] Alternatively, when applied by roller or by spraying, the cooling step may also be performed after the drying step of the primer layer.

[0103] Advantageously, the cooling step allows for the avoidance of excessively rapid drying and powdering of the new layer (the dried liquid product is in powder form).

[0104] The finishing layer can be applied by any method known to those skilled in the art, such as by spraying, by roller, by screen printing, by curtain coating, or by pad printing.

[0105] When applying the finishing layer by screen printing or by rollers, a drying step is performed.

[0106] Alternatively, the drying step can be performed after the finish layer has been applied by spraying.

[0107] The drying step allows for limiting or even eliminating the formation of defects in the coating, such as bubbles or cracks, during the curing step.

[0108] When applying a finishing layer via screen printing, a cooling step is performed after the drying step.

[0109] Alternatively, when applied by roller or spray, the cooling step can also be performed after the drying step of the finish layer.

[0110] Advantageously, the cooling step allows for the avoidance of excessively rapid drying and powdering of the new layer (the dried liquid product is in powder form).

[0111] The finish can be applied between two coats of primer or on the last coat of primer.

[0112] The topcoat layer can be applied by any method known to those skilled in the art, such as by spraying, by roller, by screen printing, by curtain coating or by pad printing.

[0113] The curing of cooked products is carried out at a temperature of 400-450°C for 1-15 minutes, preferably at 410-420°C for 2-6 minutes.

[0114] When applied via screen printing, it is preferable to perform a drying step at a temperature of 45°C to 70°C after application.

[0115] Depending on the shape of the cooking article undergoing the manufacturing process, the cooking article may undergo stamping and / or finishing steps, such as trimming, welding and equipment connection steps, to obtain the finished cooking article.

[0116] Example

[0117] 1) Products

[0118] a) Brush-coated aluminum carrier

[0119] b) Elements of the primer layer:

[0120] i) Fluoropolymer: PTFE aqueous dispersion of 60% dry extract

[0121] ii) Polymer resin: powder in aqueous emulsion

[0122] iii) Black pigment: carbon black

[0123] c) Elements of the finishing layer:

[0124] i) PTFE aqueous dispersion of 60% dry extract

[0125] ii) PAI powder in aqueous emulsion

[0126] iii) Packing material:

[0127] (1) Alumina particles with d50 = 6.5 μm

[0128] (2) Alumina particles with d50 = 45 μm

[0129] (3) PEEK particles with d50 = 23 μm

[0130] 2) Formula

[0131] a) Primer layer (CP)

[0132] i) Fluoropolymer: 90% by weight of PTFE from the dry extract

[0133] ii) Polymer resin: 2% by weight of dry extract

[0134] iii) Black pigment: 5% carbon black (dry weight)

[0135] iv) Silica: 3% dry weight

[0136] b) Finishing layer 1 (CD1 includes alumina filler)

[0137] i) Fluoropolymer: 51% dry weight of PTFE relative to the total weight of the finish formulation.

[0138] ii) Polymer resin: 0.5% dry weight of PAI relative to the total weight of the finishing formulation.

[0139] iii) Filler: 25% dry weight of alumina (d50 = 6.5 μm) relative to the total weight of the finishing formulation.

[0140] iv) Flashing agent

[0141] v) Pigment

[0142] c) Finishing layer 2 (CD2 includes polyaryletherketone filler)

[0143] i) Fluoropolymer: 60% dry weight of PTFE relative to the total weight of the finish formulation.

[0144] ii) Polymer resin: 0.5% dry weight of PAI relative to the total weight of the finishing formulation.

[0145] iii) Filler: 25% dry weight of PEEK (d50 = 23 μm) relative to the total weight of the finish formulation.

[0146] d) Finishing layer 3 (CD3 - Unfilled)

[0147] i) Fluoropolymer: 60% dry weight of PTFE relative to the total weight of the finish formulation.

[0148] ii) Polymer resin: 0.5% dry weight of PAI relative to the total weight of the finishing formulation.

[0149] e) Finishing layer 4 (CD4 - polymer-free resin)

[0150] i) Fluoropolymer: 60% dry weight of PTFE relative to the total weight of the finish formulation.

[0151] ii) Filler: 25% dry weight of alumina (d50 = 6.5 μm) relative to the total weight of the finishing formulation.

[0152] test

[0153] Sliding test of cooking products on an inclined plane

[0154] Material

[0155] • A system for changing the tilt angle when measuring the angle with respect to the horizontal plane.

[0156] • A glass plate or grid with a flat surface (on which cooking products are tested)

[0157] Soft weights

[0158] Electronic level

[0159] Conduct testing

[0160] 1) Preparation

[0161] a. Clean and wipe the outer surface of the cooked food with a dry cloth.

[0162] b. Clean and wipe the support (mesh or glass plate) with a dry cloth.

[0163] c. Place the support on the system and adjust the level to be completely horizontal (0°).

[0164] 2) A sequence method

[0165] a. Place the product to be tested at the highest point.

[0166] b. Gradually raise the plate (every degree for 2 to 3 seconds).

[0167] c. If movement of the workpiece is observed, stop (if the movement of the workpiece exceeds 1 cm, it is considered that slippage exists).

[0168] d. Use a level to check the sliding angle.

[0169] e. Repeat the operation by slowing the ascent as you approach the previously found angle to confirm.

[0170] f. Record the angles found.

[0171] 3) No-load and cold test

[0172] a. Perform three sequences.

[0173] 4) No-load and thermal tests (180℃ to 200℃)

[0174] a. Perform three sequences

[0175] Scratch test on glass-ceramic cooktop

[0176] The purpose of this test is to characterize the non-deterioration of glass-ceramic cooktops. It allows verification that cooking products are free of scratches (the test is performed under cold conditions). This test is applicable to glass-ceramic and induction-compatible cooking products. The equipment used includes cooking products, a clean, scratch-free glass-ceramic cooktop, and 100g weights.

[0177] A 100g weight is placed in the center of the cooking dish, which is then placed on a glass-ceramic cooktop. The cooking dish is then moved horizontally from point A to point B on the plate, and then horizontally from point B to point C (points A, B, and C form a triangle), repeating this process 10 times.

[0178] The conditions of the glass-ceramic cooktop were verified, and any possible scratches were recorded.

[0179] Example 1 (according to the present invention)

[0180] The primer, finish, and topcoat compositions are prepared according to the above formulation.

[0181] 1) A continuous primer layer is applied to the entire outer surface of the brush-coated aluminum blank by screen printing, wherein the primer composition CP is prepared in advance;

[0182] 2) A discontinuous finishing layer is applied to the center of the outer surface of the blank on the primer layer by screen printing, accounting for 30% of the final surface of the outer surface of the bottom of the cooking product, having a pre-prepared finishing composition CD1;

[0183] 3) Cur the blank at 415°C in an oven covered with these layers for 3 minutes.

[0184] 4) Perform a micro-blasting process on the outer surface of the blank to reduce the roughness of the finishing layer;

[0185] 5) Stamping.

[0186] Example 2 (according to the present invention)

[0187] Example 2 is the same as Example 1, except that the aluminum billet is replaced by a pre-made cooking product with a sandblasted aluminum carrier, and different layers are applied by spraying.

[0188] Example 3 (according to the present invention)

[0189] Example 3 is the same as Example 1, except that it uses a finishing composition CD2 containing PEEK filler and does not have a microblasting step.

[0190] Example 4 (Comparison - No Filler)

[0191] Example 4 is the same as Example 1, except that it uses the finishing composition CD3.

[0192] Example 5 (Comparison - Polymer-free resin)

[0193] Example 5 is the same as Example 1, except that it uses the finishing composition CD4.

[0194] Example 6 (Contrast - Finish surface <20%)

[0195] Example 6 is the same as Example 1, except that the finishing composition CD1 is applied only to 15% of the outer surface of the base wall.

[0196] Example 7 (Comparison - Filler content < 5%)

[0197] Example 7 is the same as Example 1, except that the finishing composition CD1 contains only 4% by weight of alumina filler.

[0198] Reality Example 8 (Comparison - alumina filler with d50 > 25 μm)

[0199] Example 8 is the same as Example 1, except that the finishing composition CD1 contains 25% alumina filler with a d50 of 45 μm.

[0200] Based on the above scheme, test the sliding and scraping of the above-mentioned cooked products on the stove plate.

[0201] result

[0202] Example Measured tilt angle Scratches on the board 1 11° Very subtle traces disappeared after cleaning. 2 13° Very fine marks that don't disappear after cleaning 3 11° Very subtle traces disappeared after cleaning. 4 4° Invisible scratches 5 11° Residual load (staining) and deep scratches 6 5° Very minor and cleanable scratches 7 4° Invisible scratches 8 16° deep scratches

[0203] Based on these results, it was observed that cooking articles with an unfilled finishing layer (Example 4), or with a filler content of less than 5% (Example 7), or with a finishing surface of less than 20% of the outer surface of the bottom wall (Example 6) had a very small tilt angle compared to the angles obtained by cooking articles according to the invention (Examples 1 to 3).

[0204] Furthermore, cooking articles with a finishing layer that has no polymer resin (Example 5) or contains fillers with d50 > 25 micrometers (Example 8) were observed to have a significant tilt angle compared to cooking articles according to the invention (Examples 1-3), but caused deep scratches or even discoloration of the plate on the glass-ceramic cooktop (Example 8).

Claims

1. A cooking article (1) comprising a carrier (2) having a bottom wall (21) and a side wall (31) rising around the bottom wall (21), the bottom wall (21) having an inner surface (211) for receiving food and an outer surface (212) for placement near a heat source, the side wall (31) having an inner surface (311) and an outer surface (312), characterized in that: - The outer surface (212) of the bottom wall (21) and the outer surface (312) of the side wall (31) are covered with at least one continuous primer layer, the continuous primer layer comprising at least one fluoropolymer; - The coating of the outer surface (212) of the bottom wall (21) includes at least one finish, the finish being disposed between or within layers of the coating, the finish occupying at least 20% of the surface of the outer surface (212) of the bottom wall (21), the finish comprising: At least one fluoropolymer and At least one polymer resin and The mineral filler and / or polymer filler, which are in particulate form with a d50 size of less than 25 μm, are 5-25% by weight relative to the total weight of the finishing formulation.

2. The cooking product (1) according to claim 1, characterized in that, The polymer resin is selected from polyamide-imide (PAI).

3. The cooking product (1) according to claim 1 or 2, characterized in that, The proportion of polymer resin in the finish is between 0.5% and 3% relative to the total weight of the finish, calculated on a dry weight basis.

4. The cooking product (1) according to claim 1 or 2, characterized in that, The mineral filler and the polymer filler have a Mohs hardness of less than or equal to 5.

5.

5. The cooking product (1) according to claim 1 or 2, characterized in that, The mineral filler is selected from glass, stainless steel, alumina, boron nitride, talc, kaolin or mixtures thereof.

6. The cooking article (1) according to claim 1 or 2, characterized in that, The polymer filler is selected from polyaryletherketone, polyimide, polyphenylene sulfide and mixtures thereof.

7. The cooking article (1) according to claim 1 or 2, characterized in that, The carrier includes at least one element selected from ceramics, glass, tungsten-chromium-cobalt alloys, metal alloys, or metals.

8. The cooking product (1) according to claim 7, characterized in that, The metal is aluminum, copper, titanium, or zirconium.

9. The cooking article (1) according to claim 1 or 2, characterized in that, The mineral filler or the polymer filler is spherical.

10. The cooking article (1) according to claim 1 or 2, characterized in that, Mineral and / or polymer fillers have a d50 greater than 5 μm.

11. The cooking article (1) according to claim 1 or 2, characterized in that, The finish comprises mineral fillers and / or polymer fillers comprising 10% to 20% of the total weight of the finish formulation relative to the total weight of the finish formulation.

12. A method of manufacturing a cooking article, the cooking article comprising a carrier (2) having a bottom wall (21) and a side wall (31) rising around the bottom wall (21), the bottom wall (21) having an inner surface (211) for receiving food and an outer surface (212) for placement near a heat source, the side wall (31) having an inner surface (311) and an outer surface (312), the method comprising the steps of: - Provide a carrier (2); - Apply at least one primer layer containing at least one fluorocarbon polymer to the outer surface (212) of the bottom wall (21) and the outer surface (312) of the side wall (31) of the carrier (2); - Apply at least one finish to at least 20% of the outer surface (212) of the bottom wall (21), the finish comprising at least one fluoropolymer, at least one polymer resin and 5-25% by weight of mineral filler and / or 5-25% by weight of polymer filler relative to the total weight of the finish formulation, wherein the mineral filler and / or polymer filler are in the form of particles with a d50 size of less than 25 μm; -Cure the cooked product in an oven at a temperature between 400°C and 450°C for 1 to 15 minutes.

13. The method according to claim 12, characterized in that, The finish is applied by screen printing, by rollers, by spraying, by pad printing, or by curtain coating.

14. The method according to claim 12 or 13, characterized in that, The finish is applied on the last primer layer or between two primer layers.

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