COOKING ELEMENT WITH A REMOVABLE NON-STICK FLUOROPOYMER FILM

Description

FIELD OF THE INVENTION

[0001] The present invention relates to the field of cooking elements coated with a peelable non-stick fluorinated polymer film.

[0002] The present invention also relates to kitchenware and electrical cooking appliances comprising such a cooking element. STATE OF THE ART

[0003] In the cookware industry with a non-stick cooking surface, coating performance is one of the most important concerns.

[0004] In particular, the mechanical durability of coatings based on thermostable resin, particularly polytetrafluoroethylene (PTFE), is essential. This durability is generally assessed by the appearance of scratches on the metal and wear of the coating, which results in a loss of anti-adhesion.

[0005] In the face of mechanical stresses inherent in the use of the article, a loss of the mechanical properties of the coating is observed and delamination of the coating may also occur.

[0006] It is therefore important to develop coatings that are highly durable, but also offer the possibility, once the cookware is too worn, of disassembling the coating from its substrate in order to recycle the coating and the metal substrate or to allow the creation of a new coating to extend the lifespan of the cookware.

[0007] Conventionally, a metal substrate is first shaped to form a cookware, and then the inner surface of the cookware is coated with a fluororesin having excellent heat resistance such as polytetrafluoroethylene (PTFE) or tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA) using a liquid spray coating process or a powder coating process. Alternatively, the coated substrate is coated and then shaped.

[0008] WO2016161233 describes an article comprising a metal substrate coated with a multi-layer fluorinated coating having a first layer of a fluoropolymer in contact with the metal substrate and a second fluorinated layer deposited above the first layer, wherein the second layer may be deposited by liquid spraying.

[0009] The liquid spray coating process has a number of disadvantages, particularly regarding the thickness of the coating.

[0010] When the metal substrate has a curved shape, it is difficult to obtain a coating of uniform thickness.

[0011] On the other hand, the coating thickness is limited. Cracks are likely to appear when the coating thickness is too great.

[0012] The durability of the anti-adhesion and wear resistance is therefore limited by the thickness of the coating that can be obtained using this process.

[0013] The powder coating process also has disadvantages. The resulting coating has pinhead-like defects that can lead to a reduction in non-stick properties.

[0014] In order to overcome the above-mentioned drawbacks, the state of the art describes metal substrates coated with fluorinated films by rolling.

[0015] Application KR20160099388 describes the process for obtaining a metal substrate coated with a fluorinated film (devoid of a primer layer comprising an organic compound or an adhesive). The fluorinated film is a multilayer film obtained by successive deposition on a support of an aqueous dispersion of the constituents of the layer (fluorinated resin and possibly an inorganic filler) which is dried and sintered. The multilayer film is then removed from its support and positioned on the metal substrate before assembly. The layer of the fluorinated film in contact with the metal is made of FEP, PFA, TFM, MFA (or a mixture) which has good flow properties, thus allowing good adhesion. The metal substrate / fluorinated film assembly is carried out by thermal compression, in a static press or between rollers (roll-to-roll process).

[0016] Although the process of obtaining a coated substrate by rolling a fluorinated film offers the possibility of having a thicker, and therefore more resistant, non-stick film, the mechanical properties of such a film are not, however, optimal.

[0017] Furthermore, peeling off such a film once worn is difficult. The mechanical properties of the film can be impaired, and the upper layers can be damaged. The mechanical cohesion between the different layers is then no longer sufficient to allow the multi-layer film to be removed without tearing.

[0018] The prior art describes other methods of assembling a fluorinated film on a substrate.

[0019] Application CN206950019 describes a non-stick pan comprising a non-stick layer arranged on the inner surface of the cooking utensil. The non-stick layer is preferably made of PTFE and can be fixed by bonding, but also by embedding or riveting. The film assembled by embedding cannot be easily removed. While riveting can allow the film and the substrate to be disassembled, this option is, however, not very suitable for cookware.

[0020] Removable baking sheets can provide a solution to the problem of recycling non-stick cooking coatings, but their use is not suitable for the vast majority of cookware. STATEMENT OF THE INVENTION

[0021] From an industrial point of view, there remains a need to develop coatings for cookware that perform better in terms of durability, non-stick properties and wear resistance and that can be easily disassembled from the metal substrate of the cookware in order to be recycled or to allow the creation of a new coating to extend the life of the cookware.

[0022] It has therefore become necessary to develop a metal substrate coated with a non-stick film having enhanced mechanical properties, the metal substrate and the film being furthermore easily disassembled when the coating is worn.

[0023] The applicant has thus developed a cooking element comprising a metal substrate coated with a peelable non-stick fluorinated polymeric film reinforced by means of a reinforcing layer of mineral, metallic or polymeric nature. Said film is assembled to said substrate by means of a hot-melt polymeric layer allowing, by hot peeling, easy disassembly of the film, particularly when the coating is worn. Summary of the invention

[0024] A first subject of the invention relates to a coated cooking element (1) for a cooking article or electrical cooking appliance, comprising a metal substrate (2) coated on one face (2a) with a peelable film (3) forming a cooking face (5), the peelable film (3) comprising one or more layers of fluorinated polymer(s) (7), a mechanical reinforcement layer (6) and a layer of hot-melt polymer(s) (4) arranged on the side opposite the cooking face (5) and having a melting point greater than 250°C and less than or equal to that of at least one of the other layers of the peelable film (3), said peelable film (3) being assembled with the metal substrate (2), said layer of hot-melt polymer(s) (4) being in contact with the face (2a) of the metal substrate (2).

[0025] Another subject of the invention relates to a coated cooking element (1) for a culinary article or electrical cooking appliance, comprising a metal substrate (2) coated on one face (2a) with a peelable film (3) forming a cooking face (5), the peelable film (3) comprising one or more layers of fluorinated polymer(s) (7), a mechanical reinforcement layer (6) and a layer of hot-melt polymer(s) (4) arranged on the side opposite the cooking face (5) and having a melting point greater than 250°C and lower than that of the other layers of the peelable film (3), said peelable film (3) being assembled with the metal substrate (2), said layer of hot-melt polymer(s) (4) being in contact with the face (2a) of the metal substrate (2).

[0026] Another subject of the invention relates to a method of manufacturing a coated cooking element (1) according to the invention comprising the following steps: i. Providing a metal substrate (2), ii. Optionally, pre-treating the face (2a) of said metal substrate (2) intended to be coated, iii. Providing a peelable film (3) comprising one or more layers of fluorinated polymer(s) (7), a mechanical reinforcement layer (6) and a layer of hot-melt polymer(s) (4), iv. Positioning the layer of hot-melt polymer(s) (4) of the peelable film (3) on the face (2a) of the metal substrate (2), v. Carrying out the assembly of said metal substrate (2) and the layer of hot-melt polymer(s) (4) of the peelable film (3) by hot pressing.

[0027] Another subject of the invention relates to a culinary article or an electrical cooking appliance comprising a coated cooking element (1) according to the invention. Definitions

[0028] The term "film" is understood to mean, within the meaning of the present invention, an assembly consisting of one or more superimposed layers intended to be assembled with the metal substrate. The term "film" also corresponds to said assembly once assembled with the metal substrate.

[0029] The term "layer" is understood to mean, within the meaning of the present invention, a continuous layer or a discontinuous layer. A continuous layer (or also called a monolithic layer) is a single whole forming a total flat area completely covering the surface on which it is placed or will be placed. A discontinuous layer (or non-monolithic layer) may comprise several parts, thus not being a single whole.

[0030] For the purposes of the present invention, the term "peelable" means the peelable film (3) previously assembled to the metal substrate (2) and which can be detached from the metal substrate (2) after having been heated between 250°C and 350°C for a few minutes.

[0031] For the purposes of the present invention, the term "hot-melt polymer" means a polymer that loses all mechanical strength at temperatures above its melting point.

[0032] For the purposes of the present invention, the term "aluminum alloy" means an aluminum alloy of series 1000, 2000, 3000, 4000, 5000, 6000, 7000 and 8000.

[0033] The expression "cooking article" is understood to mean, within the meaning of the present invention, an object intended for cooking. To do this, it is intended to be heated to cook or reheat the food carried by the cooking element or contained in the cooking element.

[0034] By the expression "object intended to be heated to cook or reheat the food carried by the cooking element or contained in the cooking element", it is necessary to understand within the meaning of the present invention an object which will be heated by an external heating system such as a cooking zone, such an object being able in particular to be a frying pan, a saucepan, a sauté pan, a wok, a barbecue grill, and which is capable of transmitting the heat energy provided by this external heating system to a material or food in contact with said object.

[0035] The expression "electric cooking appliance" is understood to mean, within the meaning of the present invention, an object intended for cooking. To do this, it is configured to produce heat.

[0036] The expression "object configured to produce heat" is understood to mean, within the meaning of the present invention, a heating object having its own heating system. DESCRIPTION OF FIGURES

[0037] [ Fig. 1 ] represents a sectional view of an exemplary embodiment of a coated cooking element (1) according to the invention, comprising a peelable film (3) and a metal substrate (2). [ Fig. 2 ] represents a sectional view of the metal substrate (2) and the peelable film (3) before metallurgical assembly. [ Fig. 3 ] represents a 3-dimensional view of an exemplary embodiment of a coated cooking element (1) according to the invention, comprising a peelable film (3) and a metal substrate (2), the peelable film (3) extending by a tab (8) not associated with the metal substrate. [ Fig. 4 ] illustrates a coated cooking element (1) according to the invention forming a cooking container. [ Fig. 5 ] illustrates a culinary article (100) comprising a coated cooking element (1) according to the Figure 4 . [ Fig. 6 ] illustrates an electrical cooking appliance (200) comprising a coated cooking element (1) according to the Figure 4. DETAILED DESCRIPTION OF THE INVENTION

[0038] As illustrated on the Figures 1 to 4 , a first subject of the invention relates to a coated cooking element (1) for a cooking article or electrical cooking appliance, comprising a metal substrate (2) coated on one face (2a) with a peelable film (3) forming a cooking face (5), the peelable film (3) comprising one or more layers of fluorinated polymer(s) (7), a mechanical reinforcement layer (6) and a layer of hot-melt polymer(s) (4) arranged on the side opposite the cooking face (5) and having a melting point greater than 250°C and less than or equal to that of at least one of the other layers of the peelable film (3), said peelable film (3) being assembled with the metal substrate (2), said layer of hot-melt polymer(s) (4) being in contact with the face (2a) of the metal substrate (2).

[0039] Advantageously, the layer of hot-melt polymer(s) (4) arranged on the side opposite the cooking face (5) has a melting point lower than or equal to that of the other layers of the peelable film (3).

[0040] Advantageously, the layer of hot-melt polymer(s) (4) arranged on the side opposite the cooking face (5) has a melting point lower than that of at least one of the other layers of the peelable film (3).

[0041] Advantageously, the layer of thermofusible polymer(s) (4) arranged on the side opposite the cooking face (5) has a melting point lower than that of the other layers of the peelable film (3).

[0042] As metal substrates which can be used in the context of the invention, mention may advantageously be made of substrates made of aluminum, stainless steel, cast iron or aluminum, or titanium or copper.

[0043] For the purposes of the present invention, aluminum means a metal consisting of 100% aluminum or an aluminum alloy.

[0044] According to one embodiment, the metal substrate (2) is an aluminum substrate, a stainless steel substrate or a multi-layer metal substrate. The metal substrate may be a multi-layer metal substrate, in particular a two-layer or three-layer substrate, made of different metals such as steel, stainless steel, aluminum, magnesium, copper or titanium, these multi-layers being able to be obtained for example by co-rolling, by hot or cold forging, or by hot diffusion under load (solid state bonding).

[0045] Preferably, the metal substrate (2) comprises alternating layers of metal and / or metal alloy, or is a cap of cast aluminum, aluminum or aluminum alloys lined with an outer base of stainless steel.

[0046] Generally, the peelable film (3) completely covers the face (2a) of the metal substrate (2), but it can be envisaged that only a part of the metal substrate (2) is covered.

[0047] The surface of the metal substrate (2) can be treated prior to assembly of the peelable film (3) so as to increase its specific surface area and thus improve the adhesion of the film: this treatment can be a chemical attack, brushing, sandblasting, shot blasting, a physicochemical treatment of the plasma or corona or laser type, a chemical activation or a combination of these different techniques.

[0048] According to one embodiment, the face (2a) of the metal substrate (2) has undergone a surface treatment prior to the assembly of the peelable film (3) with the face (2a) of the metal substrate (2).

[0049] The surface treatment of the face (2a) is chosen from chemical attack, brushing, sandblasting, shot blasting, physicochemical treatment of the plasma or corona or laser type, chemical activation or a combination of these different techniques.

[0050] The adhesion of a fluorinated film to a metal substrate presents technical difficulties due to the intrinsic non-stick nature of fluorinated polymers: one solution consists of using a hot-melt adhesive undercoat, thus improving the adhesion of the fluorinated film to the metal substrate.

[0051] The peelable film (3) of the coated cooking element (1) according to the invention comprises a layer of thermofusible polymer(s) (4) arranged on the side opposite the cooking face (5), said layer having a melting point higher than 250°C and lower than that of the other layers of the peelable film (3).

[0052] This allows said layer of hot-melt polymer(s) (4) to maintain good mechanical strength with the substrate at room temperature and up to a normal operating temperature of a cooking surface, i.e. approximately 250°C. For temperatures above approximately 250°C, the reduction in the mechanical properties of the layer of hot-melt polymer(s) (4) allows the entire peelable film (3) to be disassembled by peeling.

[0053] According to one embodiment, the hot-melt polymer(s) of the hot-melt polymer layer(s) (4) are chosen from fluoropolymers and silicones.

[0054] Preferably, the hot-melt polymer(s) of the hot-melt polymer layer(s) (4) are chosen from copolymers of tetrafluoroethylene and perfluoropropylvinylether (PFA), copolymers of tetrafluoroethylene and hexafluoropropylene (FEP), copolymers of tetrafluoroethylene and perfluoromethylvinylether (MFA), and mixtures thereof.

[0055] The layer of hot-melt polymer(s) (4) is easily differentiated from the metal substrate (2) by cross-sectional observations using a scanning electron microscope (SEM) or by infrared spectroscopy.

[0056] The thickness of the layer of hot-melt polymer(s) (4) of the peelable film (3) of the coated cooking element (1) according to the invention, i.e. measured on the cooking element once it has been coated with the peelable film (3), is between 1 µm and 100 µm, preferably between 5 µm and 50 µm.

[0057] The measurement of the thickness of the layer of hot-melt polymer(s) (4) is carried out at 20 random points on the section of the peelable film (3). The average thickness of the layer of hot-melt polymer(s) (4) is obtained by averaging these 20 measurements.

[0058] The peelable film (3) may comprise among the layers of fluorinated polymer(s) (7) at least one other layer of hot-melt polymer(s), if desired of the same composition as the layer of hot-melt polymer(s) (4), said other layer of hot-melt polymer(s) preferably being arranged between the mechanical reinforcement layer (6) and the cooking face (5), for example between the mechanical reinforcement layer (6) and the or one of the layers of fluorinated polymer(s) (7).

[0059] In order to improve the durability of the peelable film (3) on the one hand and to enable disassembly of said peelable film (3) by peeling, the peelable film (3) comprises a mechanical reinforcement layer (6).

[0060] The mechanical reinforcement layer (6) improves the durability of the anti-adhesion and scratch resistance of the peelable film (3).

[0061] Furthermore, in the absence of a mechanical reinforcing layer (6), disassembly by peeling of such a film, once worn, is difficult. The mechanical properties of the film may be impaired, and the upper layers may be damaged. The mechanical cohesion between the different layers is then no longer sufficient to allow removal of the multilayer film without it tearing. In the presence of the mechanical reinforcing layer (6), even if the upper layers of the peelable film (3) are damaged, the peelable film (3) can be removed in its entirety by peeling more easily.

[0062] The mechanical reinforcement layer (6) comprises a mineral reinforcement, a metallic reinforcement or a non-fluorinated polymer with high thermomechanical properties.

[0063] The mechanical reinforcement layer (6) may be a continuous layer or a non-continuous layer.

[0064] According to one embodiment, the mineral reinforcement of the mechanical reinforcement layer (6) is chosen from glass fibers, glass fiber materials or fabrics, carbon fibers and carbon fiber materials or fabrics.

[0065] According to another embodiment, the metal reinforcement of the mechanical reinforcement layer (6) is a non-continuous metal element. It may be expanded metal, perforated metal or a mesh. In all cases, the metal reinforcement is not a continuous layer.

[0066] According to one embodiment, the non-fluorinated polymer with high thermomechanical properties of the mechanical reinforcement layer (6) is chosen from polyaryletherketones (PEAK), such as for example polyetheretherketone (PEEK), and polyamide-imides (PAI).

[0067] The non-fluorinated polymer with high thermomechanical properties of the mechanical reinforcement layer (6) can be in the form of a continuous layer, in the form of a non-continuous layer comprising holes or in the form of a unidirectional reinforcement of the fiber type used in woven or non-woven form.

[0068] According to another embodiment, the mechanical reinforcement layer (6) further comprises a polymer impregnating and completely covering said reinforcement.

[0069] According to one embodiment, the mechanical reinforcement layer (6) consists of a mineral reinforcement, a metallic reinforcement or a non-fluorinated polymer with high thermomechanical properties.

[0070] According to one embodiment, the peelable film (3) of the coated cooking element (1) according to the invention comprises a single layer of fluorinated polymer(s) (7).

[0071] According to another embodiment, the peelable film (3) of the coated cooking element (1) according to the invention comprises several layers of fluorinated polymer(s) (7), said layers possibly being of different composition.

[0072] According to another embodiment, the peelable film (3) of the coated cooking element (1) according to the invention comprises several layers of fluorinated polymer(s) (7), said layers being of the same composition.

[0073] Advantageously, the fluoropolymer or the mixture of fluoropolymers of the fluoropolymer layer(s) (7) of the peelable film (3) is chosen from the group comprising polytetrafluoroethylene (PTFE), copolymers of tetrafluoroethylene and polymethylvinylether (MVA), terpolymers of tetrafluoroethylene, polymethylvinylether and fluoroalkylvinylether (TFE / PMVE / FAVE), and mixtures thereof.

[0074] The thickness of the layer(s) of fluorinated polymer(s) (7) of said peelable film (3) of the coated cooking element (1) according to the invention is between 10 and 400 µm, preferably between 30 and 250 µm, particularly preferably between 50 and 200 µm.

[0075] The measurement of the thickness of the layer(s) of fluorinated polymer(s) (7) of the peelable film (3) of the coated cooking element (1) according to the invention, i.e. measured on the element once it has been coated with the peelable film (3), is carried out at 20 random points on the section of the film. The average thickness of the metal layer is obtained by averaging these 20 measurements.

[0076] According to one embodiment, the peelable film (3) of the coated cooking element (1) according to the invention comprises a layer (7a) of fluorinated polymer(s) forming the cooking face (5).

[0077] Advantageously, the fluorinated polymer(s) of the layer (7a) is (are) chosen from the group comprising polytetrafluoroethylene (PTFE), copolymers of tetrafluoroethylene and polymethylvinylether (MVA), terpolymers of tetrafluoroethylene, polymethylvinylether and fluoroalkylvinylether (TFE / PMVE / FAVE), and mixtures thereof.

[0078] Advantageously, the fluoropolymer or the mixture of fluoropolymers of the fluoropolymer layer(s) (7) of the peelable film (3) is chosen from polytetrafluoroethylene (PTFE) and mixtures comprising polytetrafluoroethylene (PTFE) and one or more fluoropolymers chosen from copolymers of tetrafluoroethylene and polymethylvinylether (MVA) and terpolymers of tetrafluoroethylene, polymethylvinylether and fluoroalkylvinylether (TFE / PMVE / FAVE).

[0079] The peelable film (3) of the coated cooking element (1) according to the invention may also comprise at least one filler.

[0080] As fillers which can be used under the present invention, mention may in particular be made of metal oxides, metal carbides, metal oxynitrides, metal nitrides, silicas and their mixtures.

[0081] In the example embodiment illustrated on the Figures 1 and 2, the peelable film (3) comprises 2 layers of fluorinated polymer(s) (7a and 7b) and a mechanical reinforcement layer (6).

[0082] The total thickness of the peelable film (3) of the coated cooking element (1) according to the invention, i.e. measured on the cooking element once it has been coated with the film (3), is between 10µm and 500µm, preferably between 30µm and 300µm, particularly preferably between 50µm and 200µm.

[0083] The measurement of the thickness of the peelable film (3) of the coated cooking element (1) according to the invention is carried out at 20 random points on the section of the film. The average thickness of the metal layer is obtained by averaging these 20 measurements.

[0084] According to an embodiment illustrated in the Figure 3, the peelable film (3) is extended by a tab (8) not associated with the metal substrate (2), said tab (8) facilitating the gripping of said peelable film (3) for the peeling disassembly operation.

[0085] The peelable film (3) before assembly with the metal substrate (2) can be obtained by depositing a first layer on a support, then possibly by the successive deposition of the other layers, then by exfoliation of said film to separate it from the support. The layers of the peelable film (3) can also be assembled together by any other assembly process, such as by lamination for example.

[0086] The thickness of the layer of hot-melt polymer(s) (4) of the peelable film (3) before assembly with the metal substrate (2) is between 1 µm and 100 µm, preferably between 5 µm and 50 µm.

[0087] The thickness of the layer(s) of fluorinated polymer(s) (7) of the peelable film (3) before assembly with the metal substrate (2) is between 10 and 400 µm, preferably between 30 and 250 µm, particularly preferably between 50 and 200 µm.

[0088] The total thickness of the peelable film (3) before assembly with the metal substrate (2) is between 10 µm and 500 µm, preferably between 30 µm and 300 µm, particularly preferably between 50 µm and 200 µm.

[0089] Another subject of the invention relates to a method of manufacturing a coated cooking element (1) according to the invention comprising the following steps: i. Providing a metal substrate (2), ii. Optionally, pre-treating the face (2a) of said metal substrate (2) intended to be coated, iii. Providing a peelable film (3) comprising one or more layers of fluorinated polymer(s) (7), a mechanical reinforcement layer (6) and a layer of hot-melt polymer(s) (4), iv. Positioning the layer of hot-melt polymer(s) (4) of the peelable film (3) on the face (2a) of the metal substrate (2), v. Carrying out the assembly of said metal substrate (2) and the layer of hot-melt polymer(s) (4) of the peelable film (3) by hot pressing.

[0090] Step v. of assembly by hot pressing is carried out at a temperature preferably between 250°C and 350°C.

[0091] There Figure 4illustrates a coated cooking element (1) according to the invention forming a cooking container. The peelable film (3) assembled with the metal substrate (2) forms the cooking face (5) arranged inside the cooking container.

[0092] The method of peeling the peelable film (3) from a coated cooking element (1) according to the invention comprises the following steps: a) Heating the cooking element to a temperature between 250°C and 350°C b) Disassembly by peeling the peelable film (3) and the metal substrate (2), if applicable by means of the tab (8) facilitating the gripping of said peelable film (3).

[0093] Step a) of heating can be carried out using any heat-generating appliance, such as an oven. The heating time depends on the size of the cooking element to be heated and is adjusted accordingly.

[0094] Disassembly of the peelable film (3) from the metal substrate (2) allows recycling of the used coating and facilitates recycling of the metal substrate. It also offers the possibility of assembling a new coating, thus extending the life of the coated cooking element (1).

[0095] The layer of hot-melt polymer(s) (4) and the mechanical reinforcement layer (6) allow the peelable film (3) to be easily disassembled from the metal substrate (2). The mechanical reinforcement layer (6) allows the peelable film (3) to remain cohesive when the layer of hot-melt polymer(s) (4) has reached a temperature exceeding its melting point. Thus, a force can be exerted on the peelable film (3) to disassemble it from the metal substrate (2). The melting of the layer of hot-melt polymer(s) (4) allows decohesion with the metal substrate (2).

[0096] Another subject of the invention relates to a culinary article (100) comprising a coated cooking element (1) according to the invention.

[0097] According to an embodiment illustrated in the Figure 5 , the culinary article (100) according to the invention comprises a coated cooking element (1) forming a cooking container and is equipped with a gripping member (10) fixed to said coated cooking element (1). The culinary article (100) comprises a heating face (9) intended to be brought into contact with an external heating source, the heating face (9) being opposite the cooking face (5) intended to be brought into contact with the food during cooking.

[0098] The cooking article (100) according to the invention is chosen from the group consisting of saucepan, frying pan, skillets or fondue or raclette pots, stewpot, wok, sauté pan, crepe maker, grill, griddle, pot, casserole dish, cooker or bread machine bowl, cooking mold. Thus the cooking article (100) can form a cooking accessory for an electric cooking appliance.

[0099] Another subject of the invention relates to an electrical cooking appliance (200) comprising a coated cooking element (1) according to the invention.

[0100] According to another embodiment illustrated in the Figure 6, the electrical cooking appliance (200) according to the invention comprises a coated cooking element (1) and a heating source (210) configured to heat said coated cooking element (1). The coated cooking element (1) forming a cooking container is arranged in a heating base (230) comprising the heating source (210) composed of several heating elements (220). The heating face (9) rests on the heating elements (220). If desired, the heating face (9) can be integral with the heating elements (220).

[0101] The electric cooking appliance (200) according to the invention is chosen from the group consisting of electric crepe maker, electric raclette appliance, electric fondue appliance, electric grill, electric griddle, electric cooker, bread machine.

Claims

1. A coated cooking element (1) for a culinary item or electric cooking apparatus, comprising a metal substrate (2) coated on one face (2a) with a peelable film (3), forming a cooking face (5), the peelable film (3) comprising one or more layers of fluorinated polymer (7), a mechanical reinforcing layer (6) and a layer of hotmelt polymer(s) (4) arranged on the opposite side to the cooking face (5) and having a melting point higher than 250°C and lower than or equal to that of at least one of the other layers of the peelable film (3), said peelable film (3) being assembled with the metal substrate (2), said layer of hotmelt polymer(s) (4) being in contact with the face (2a) of the metal substrate (2).

2. The coated cooking element (1) according to claim 1, characterised in that the layer of hotmelt polymer(s) (4) arranged on the opposite side to the cooking face (5) has a melting point lower than that of the other layers of the peelable film (3).

3. The coated cooking element (1) according to any one of the preceding claims, characterised in that the mechanical reinforcement layer (6) comprises a mineral reinforcement, metallic reinforcement or a non-fluorinated polymer with high thermal and mechanical properties.

4. The coated cooking element (1) according to claim 3, characterised in that the mineral reinforcement is chosen from glass fibres, glass-fibre materials or fabrics, carbon fibres and carbon-fibre materials or fabrics, or in that the metallic reinforcement is a non-continuous metal element, or in that the non-fluorinated polymer with high thermomechanical properties is chosen from the polyaryletherketones (PEAK) and polyamide-imides (PAI).

5. The coated cooking element (1) according to claim 4, characterised in that the mechanical reinforcement layer (6) further comprises a polymer, impregnating and completely covering said reinforcement.

6. The coated cooking element (1) according to any one of the preceding claims, characterised in that the hotmelt polymer(s) of the layer of hotmelt polymer(s) (4) are chosen from fluoropolymers and silicones.

7. The coated cooking element (1) according to claim 6, characterised in that the hotmelt polymer(s) of the layer of hotmelt polymer(s) (4) are chosen from copolymers of tetrafluoroethylene and perfluoropropylvinylether (PFA), copolymers of tetrafluoroethylene and hexafluoropropylene (FEP), copolymers of tetrafluoroethylene and perfluoromethylvinylether (MFA), and the mixtures thereof.

8. The coated cooking element (1) according to any one of the preceding claims, characterised in that said peelable film (3) comprises a layer (7a) of fluorinated polymer(s) forming the cooking face (5).

9. The coated cooking element (1) according to any one of the preceding claims, characterised in that the fluorinated polymer or the mixture of fluorinated polymers of the one or more layers of fluorinated polymer(s) (7) of said peelable film (3) is chosen from the group comprising polytetrafluoroethylene (PTFE), the copolymers of tetrafluoroethylene and polymethylvinylether (MVA), the terpolymers of tetrafluoroethylene, polymethylvinylether and fluoroalkylvinylether (TFE / PMVE / FAVE), and the mixtures thereof.

10. The coated cooking element (1) according to any one of the preceding claims, characterised in that the peelable film (3) is extended by a tab (8) that is not associated with the metal substrate (2), said tab (8) facilitating the gripping of said peelable film (3) for the operation of disassembly by peeling.

11. A method for manufacturing a coated cooking element (1) according to any one of the preceding claims comprising the following steps: i. Supplying a metal substrate (2), ii. Optionally, prior treatment of the face (2a) of said metal substrate (2) intended to be coated, iii. Supplying a peelable film (3) comprising one or more layers of fluorinated polymer(s) (7), a mechanical reinforcement layer (6) and a layer of hotmelt polymer(s) (4), iv. Positioning the layer of hotmelt polymer(s) (4) of the peelable film (3) on the face (2a) of the metal substrate (2), v. Performing the assembly of said metal substrate (2) and the layer of hotmelt polymer(s) (4) of the peelable film (3) by hot pressing.

12. A method for peeling the peelable film (3) of a coated cooking element (1) according to any one of claims 1 to 10, comprising the following steps: a) Heating the cooking element to a temperature between 250°C and 350°C, b) Disassembling by peeling the peelable film (3) and the metal substrate (2), where applicable by means of the tab (8) facilitating the gripping of said peelable film (3).

13. A culinary item (100) comprising a coated cooking element (1) according to any one of claims 1 to 10.

14. The culinary item (100) according to claim 13, characterised in that it comprises a heating face (9) intended to be placed in contact with an external heating source, the heating face (9) being opposite the cooking face (5) intended to be placed in contact with foods during cooking.

15. An electric cooking appliance (200) comprising a coated cooking element (1) and a heat source (210) configured to heat said coated cooking element (1), characterised in that said coated cooking element (1) is according to one of claims 1 to 10.