DE102014102572A1 - Cleaning method for a cooking appliance and cooking appliance for carrying out the method - Google Patents

Abstract

The invention relates to a method for cleaning a cooking appliance with at least one cooking chamber, wherein the method comprises at least one cleaning phase for cleaning the cooking chamber of greasy impurities and a coating phase, in which the cooking chamber with at least one coating agent for applying a protective film on at least a portion of the cooking chamber is treated. The protective film is removed in subsequent purification steps together with the fatty impurities.

Description

The present invention relates to a method for cleaning a cooking appliance with a cooking chamber, a cooking appliance for carrying out the process and a coating agent for use in the cleaning process.

Food cooking equipment for professional applications such as restaurant or canteen kitchens is well known. Steam is generated in these appliances so that the food can be cooked under pressure in a closed cooking chamber. However, when cooking the food, the steam used inevitably absorbs other solid, liquid and / or gaseous portions in different concentrations. These parts come in particular from the food to be cooked and can settle in the cooking chamber and on the components of the cooking appliance.

• a) Bedämpfen des Garraums;
• b) Einbringen eines Reinigers;
• c) Entkalken des Gargeräts;
• d) Klarspülen, und/oder
• e) Trocknen, insbesondere mit Heißluft.

From the DE 198 38 864 C2 a method for cleaning a cooking appliance with a cooking chamber is known in which at least one spray nozzle is arranged in the cooking chamber and cyclically driven there in a rotational movement through the cooking chamber. This method enables an automated execution of a cleaning program in which several purification steps can be carried out successively:

• a) steaming the cooking chamber;
• b) introduction of a cleaner;
• c) descaling the cooking appliance;
• d) rinse, and / or
• e) drying, in particular with hot air.

Further examples of suitable purification processes can be found in US Pat DE 101 24 703 and the DE 101 34 005 A1 ,

The DE 10 2004 016 821 B4 describes a designed as a rinsing method cleaning process for a cooking appliance, which is dispensed with the use of a cleaner. Depending on the degree of soiling, some steps of the cleaning program can also be repeated.

It is also known to carry out, for example, the steps of descaling and rinsing simultaneously. The EP 2 221 357 A1 describes a combined decalcifier and rinse aid for use in devices and systems with metallic, ceramic, glass or plastic surfaces, in particular for steam generation or heat treatment of food. The descaling agent and rinse aid is preferably in the form of a tablet or a tablet and contains at least two fruit acids and a sequestering system which is intended to prevent the sedimentation of lime on the surface of the device. The sequestering system is described as a combination of a water-soluble polymer with phosphonates.

The deposits in the cooking chamber and on easily accessible components of the cooking appliance arising during the cooking process can be reliably removed by the described automated cleaning programs. On some of the components present in the cooking appliance, in particular on valves, lines, sensors, springs and membranes, however, deposits and adhesions may form due to the deposited fats and / or food residues, which may extend to complete blockages of individual cross sections. Certain foods also result in deposits in the cooking chamber, which can be eliminated with the conventional programs and cleaning agents only with great effort.

The object of the invention is to provide a method for cleaning the cooking chamber and other components of a cooking appliance, which reliably delivers an optimal and hygienic cleaning result even for small kitchen appliances used in cooking appliances with little effort.

This object is achieved by a method for cleaning a cooking appliance having at least one cooking chamber according to claim 1, in particular a cooking appliance for pressure cooking of foodstuffs, wherein the method comprises a coating phase in which the cooking chamber with at least one coating agent for applying a protective film on at least one part the cooking space is treated.

The protective film applied in the coating phase can initially serve as a dirt-repellent layer for the deposits formed during the cooking process from fats and / or other food residues and thus makes it more difficult for the deposits and incrustations to adhere to the surfaces of the cooking chamber and the connected components. The deposits can then be removed in a subsequent to the cooking process cleaning phase easier and with less use of cleaning chemicals. In accordance with a preferred embodiment of the invention, the protective film may be designed such that it withstands a predetermined number of cleaning phases before a refreshment is carried out.

According to a further embodiment of the invention, it is provided that the protective film is used by the treatment agents used in a cleaning phase following the cooking process, such as superheated steam, cleaner, descaling agent and rinse aid is attacked and can be at least partially removed. The protective film then forms a releasable sacrificial layer in the cleaning phase, which is removed along with the deposits and other contaminants. The thus cleaned and optionally dried Garraumflächen can then be treated with renewal of the protective film in turn with the coating agent.

The embodiments described above can also be combined with each other. The protective film then serves both as a dirt-repellent layer which reduces the adhesion of deposits from a cooking process and as a sacrificial layer which can be removed in a cleaning phase following the cooking process.

The invention thus also relates to a cooking appliance for carrying out the cleaning method described above.

The invention is further directed to the use of a coating agent for treating a cooking appliance with a cooking chamber, wherein the coating agent comprises a film-forming organic component which forms a protective film in the cooking chamber, which reduces the adhesion of deposits from a cooking process and / or by one or several on the cooking process following treatment steps of a cleaning phase attacked and can be replaced together with the deposits.

Preferred embodiments of the invention are specified in the subclaims, which can optionally be combined with one another.

The invention will be described below with reference to preferred embodiments, which, however, should not be taken in a limiting sense.

As a cooking chamber in the context of the invention is understood by side plates, floor panels and ceiling panels and a cooking chamber door or a cooking compartment lid and used for cooking the food space of the cooking appliance, including the devices contained therein such as food containers, baffles, suspension devices and Einschubleisten for food containers, oven rack , Crockery, cutlery and / or other accessories, as well as possibly connected and fluidly connected to the cooking compartment components such as drain and condenser. Cooking chamber surfaces are the wall surfaces of the cooking chamber and the surfaces of the devices contained in the oven.

A cleaning phase according to the invention can, as known from the prior art, be carried out in several successive steps, which can also be automated.

In particular, the cleaning phase may comprise one or more of the following treatment steps:
Steaming the cooking chamber with water vapor;
Treating the cooking chamber with a pre-rinse;
Treating the cooking chamber with a cleaning agent;
Treating the cooking chamber with a descaling agent;
Treating the cooking chamber with a rinse aid;
Treating the cooking chamber with a post-cleaning agent; and
Dry the cooking chamber by treating with warm air.

Individual cleaning steps can be omitted or repeated if necessary. Thus, the steaming of the cooking chamber can be carried out both at the beginning of the cleaning process, but also after treating the cooking chamber with descaler and / or rinse aid can be repeated.

The order of the purification steps is variable. For example, the treatment of the oven with rinse aid can be carried out both before and after descaling. Rinse and descaling can also be combined into a single cleaning step. All of these variants are known to the person skilled in the art and are selected and / or set by the operator depending on the desired cleaning program, the treatment agents used and the degree of soiling of the cooking appliance.

Likewise, the usual, used in the prior art treatment agents can be used to carry out the cleaning phase.

In particular, clear water can be used as the pre-rinse.

Detergents are in particular compositions based on surfactants and surfactant mixtures, in particular nonionic surfactants, anionic surfactants, cationic surfactants and / or amphoteric surfactants and mixtures thereof. In the detergents, the surfactant components are present as the usual main component.

In particular alkoxylated fatty acid esters and fatty alcohols having 8 to 18 C atoms in the alcohol radical can be used as nonionic surfactants. Further suitable nonionic surfactants are the optionally alkoxylated mono-, di- and triglycerides of fatty acids.

Useful anionic surfactants include, for example, alkyl carboxylates, linear alkyl benzene sulfonates, paraffin sulfonates, C _6-10 linear alkyl sulfates, or their alkali or ammonium salts, secondary N-alkane sulfonates, sulfosuccinate esters, and sulfated linear alcohols.

Known cationic surfactants are quaternary ammonium compounds having at least one long-chain hydrocarbon radical in the molecule, which may have 6 to 22 carbon atoms.

Suitable amphoteric surfactants are, for example, beta-N-alkylaminopropionic acids, n-alkyl-beta-iminodipropionic acids, imidazolinecarboxylates, n-alkylbetaines, amine oxides, sulfobetaines and / or sultaines.

The rinse aids and descaling agents used are preferably fruit acids and phosphonates such as citric acid, malic acid, tartaric acid and 1-hydroxyethane-1,1-diphosphonic acid (HEDP). Also suitable are carboxylic acids such as fumaric acid, maleic acid, glycolic acid, acetic acid, oxalic acid, malonic acid, succinic acid, lactic acid, glutaric acid, and adipic acid.

Suitable descaling agents are further amidosulfonic acid, sodium hydrogen sulfate, salts of dihydrogen phosphate and hydrogen phosphate, phosphoric acid and boric acid and mixtures thereof.

The final cleaning can be done with hot or cold water.

The drying is usually carried out by treating the cooking chamber with hot air with the blower.

The coating composition of the invention is preferably applied after the cleaning phase, ie on the cleaned and dried Garraumflächen. Likewise, the application of the coating agent can be carried out before the first cooking process. In this way, the protective film formation can be reliably controlled. In addition, the protective film can then be sufficiently stabilized by aging, in particular by a heat treatment, so that no detachment of the protective film takes place in the subsequent cooking process.

However, it can also be provided to carry out the treatment of the cooking chamber with the coating agent during the cleaning phase, for example after a rinse and / or decalcification, instead of a post-cleaning or after treatment with the post-cleaning agent but before drying. It should be noted, however, that the protective film formation is not disturbed by simultaneously or later acting treatment agent.

In addition, the protective film should be formed with sufficient layer thickness and / or film density and not be significantly affected by the subsequent cleaning steps. Insofar as the cleaning phase comprises a treatment with a cleaning agent, a descaling agent or a rinse aid, the coating phase is preferably initiated only after carrying out these cleaning steps. This ensures that the protective film remains stable and also no unwanted incorporation of components from the cleaning agent, the descaling agent and / or the rinse aid in the protective film.

The treatment with the coating agent preferably produces a protective film which, when dried, has a layer thickness of from 0.01 to 100 μm, preferably to 50 μm and particularly preferably to 20 μm. The layer thickness can be determined by subtracting a defined area of the protective film and weighing.

The coating composition is preferably present separately from the treatment agents, such as cleaning agents, descaling agents and / or rinse aids, and / or it is introduced into the cooking space in a separate treatment step. In order to avoid a disruption of the formation of the protective film, the coating agent is preferably not used together with a surfactant-based cleaning agent, a descaling agent or a rinse aid.

If the formation of a protective film adhering to the cooking chamber surfaces is ensured, however, the coating composition can also be introduced into the cooking chamber together with the cleaning agent, the rinse aid and / or the descaling agent. In this case, it is also conceivable that combined treatment and coating agents are used, always provided that after treatment with the combined treatment and coating agent, a substantially coherent protective film remains on the cooking chamber surfaces.

The coating phase is preferably carried out immediately before the step of drying with hot air, particularly preferably in place of or after treating the cooking chamber with a post-cleaning agent.

The coating agent used to carry out the cleaning process according to the invention preferably contains a film-forming organic component as the main constituent. The main constituent of the coating agent is the component with the highest mass fraction in the Coating considered, based on the solids content and without solvent.

Preferably, the film-forming organic component is selected from the group consisting of natural and synthetic waxes, natural and synthetic polymers, copolymers and oligomers, and mixtures thereof.

Examples of natural waxes are candelilla wax, carnauba wax, Japan wax, Esparto grass wax, cork wax, guaruma wax, rice germ oil wax, sugarcane wax, ouricury wax and montan wax, beeswax, shellac wax, spermaceti, wool wax and raffia fat.

Examples of synthetic waxes are mineral waxes, in particular ceresin, ground wax, petrolatum and paraffin, hydrogenated jojoba oil, oxidized polyethylene waxes and polyethylene glycol waxes, as well as ester waxes and synthetic microwaxes.

The wax preferably has a melting point above 60 ° C., in particular above 90 ° C. and particularly preferably above 120 ° C.

As an alternative or in addition to the aforementioned waxes, a polymer or copolymer from the group of cellulose and cellulose derivatives such as cellulose ethers, poly (meth) acrylates, polyesters, polyethers, polyvinyl alcohols, polyvinyl esters, polyamides and polyurethanes can be used as the film-forming component.

Preferably, the polymer or oligomer of the film-forming component is water-soluble or water-dispersible.

A proportion of aliphatic polyurethane promotes the adhesion and flexibility of the protective film.

Polyvinyl alcohols with good film-forming properties are widely available commercially. Depending on the degree of hydrolysis, the polyvinyl alcohols are readily soluble in water and permeable to water vapor.

According to a preferred embodiment, the coating agent contains a biodegradable polymer as the film-forming component. These polymers are, for example, marketed as medical devices such as components of catheters and stents or as packaging for foodstuffs and are toxicologically harmless.

Suitable biodegradable polymers may be selected from the following group: cellulose and cellulose derivatives, polyhydroxy esters, in particular polyhydroxybutyrates and polyhydroxyvalerates and their copolymers, polyhydroxypropionate (PHPA); Polylactides (PLA) such as poly-L-lactide (PLLA), poly-D-lactide (PDLA), poly-DL-lactide (PDLLA), L-lactide / DL-lactide copolymers, L-lactide / D-lactide Copolymers and copolymers such as lactide / tetramethylene glycolide copolymers, lactide / trimethylene carbonate copolymers, lactide / δ-valerolactone copolymers, lactide / ε-caprolactone copolymers, and PLA / ethylene oxide copolymers, polyglycolic acids (PGA) and copolymers such as and glycolide / lactide Copolymers (PGA / PLA) and glycolide / trimethylene carbonate copolymers (PGA / TMC), aliphatic polyamides and polyurethanes, polyvalerolactones and polycaprolactones, methylmethacrylate-N-vinylpyrrolidone copolymers, polyvinyl alcohols, aliphatic polyesters, polyorthoesters, polyesters of oxalic acid, polydihydropyrans, polyalkyl cyanoacrylates , Polyethylene succinates and polyethylene oxalates, polymaleic acid (PMLA), aliphatic polyester amides and polydioxanone, polyethylene oxide (PEO), chitin polymers and copolymers, and mixtures thereof.

The number average molecular weight of the polymers used as the film-forming component is preferably at least 1,000 and is more preferably between 2,000 and 250,000 or between 5,000 and 200,000.

The coating composition preferably contains as film-forming component a thermoplastic polymer or copolymer having a glass transition point below the temperatures occurring during the pressure cooking of foods, preferably at most 130 ° C., preferably at most 180 ° C., particularly preferably at most 220 ° C. It is believed that the transition of the polymer into the rubbery region during the cooking process at the glass transition point counteracts premature delamination of the protective film.

The melting point of the polymer is preferably above this temperature, preferably above 150 ° C, preferably above 200 ° C and more preferably above 250 ° C. Thus, a transfer of components of the protective film can be excluded on the food to be cooked.

The coating agent and the treatment agents used in the cleaning phase, such as cleaning agents, rinse aids and / or descaling agents, are preferably matched to one another so that the protective film is attacked by at least one of the treatment agents used in the cleaning phase and detached from the cooking chamber surfaces.

Preferably, the aforementioned polymers and copolymers may be cationically or anionically modified. By modifying the polymers, it is possible to specifically control the attack of the treatment agents on the protective film. For example, a Protective film with a higher content of anionic polymers more easily attacked by detergents with cationic surfactants and vice versa. The cationic or anionic modification also promotes a dirt repellent effect of the protective film, so that less deposits can form.

The film-forming component is present in the coating agent preferably in a proportion of at least 40 wt .-%, based on the dry content of the coating composition. The proportion of the film-forming component is preferably at least 50% by weight, more preferably at least 60% by weight, at least 70% by weight, at least 80% by weight, at least 90% by weight or at least 95% by weight. ,

In addition to the film-forming component, the coating agent may contain at least one film-forming aid. The film-forming aid influences the chain mobility of the polymer particles during drying and thus promotes film formation.

Particularly suitable as film-forming aids are C ₄ -C ₁₆ alcohols, glycol ethers and carboxylic acid esters, for example alkyl citrates and alkyl adipates. Suitable film forming aids are, in particular butanediol, butyl glycol, butyl diglycol, ethylene glycol ethers such as ethylene glycol monobutyl ether, ethylene glycol monoethyl ether, ethylene glycol monomethyl ether, Ethylglykolpropylether, ethylene glycol hexyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol butyl ether, diethylene glycol hexyl ether and polypropylene glycol ethers such as propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, Tripropylenglykolmonobutylether, propylene glycol monopropyl ether, dipropylene glycol monopropyl ether and Tripropylenglykolmonopropylether.

The film-forming aid is preferably present in a proportion of 0 to 20 wt .-% in the coating material, based on the solids content. If the film-forming aid is liquid at room temperature, it is added to the proportion of solvent.

Furthermore, the coating agent may contain a particulate inorganic additive. The additive is preferably an optionally modified silica, in particular colloidal silica, alumina and / or titania. The inorganic additive is particularly preferably in the form of nanoparticles.

With the inorganic additive, the transparency of the protective film can be improved. In addition, the inorganic additive also serves to improve the dirt-repellent effect of the protective film.

The proportion of the inorganic additive in the coating composition is preferably 0 to 30 wt .-%, preferably 0.01 wt .-% to 30 wt .-%, more preferably, 0.05 wt .-% to 20 wt .-%, and in particular at most 10% by weight or at most 5% by weight, in each case based on the solids content.

Finally, the coating composition may contain one or more additives from the group of binders, gelling agents, viscosity modifiers, wetting agents, flow control agents, dispersants, emulsifiers and fragrances. These additives are preferably present in a proportion of 0 to 20 wt .-% in the coating agent, based on the solids content.

Examples of such additives are in particular nonionic, cationic or anionic surfactants, such as fatty alcohol alkoxylates, preferably ethoxylated fatty alcohols having 8 to 18 carbon atoms and 1 to 12 ethoxy groups per alcohol radical.

Suitable binders, gelling agents and / or viscosity modifiers are, for example, carboxypolymethylene, carboxymethylcellulose, carboxypropylcellulose, poloxamer, carrageenan, veegum, carboxyvinyl polymers, karaya gum, xanthan gum, guar gum, gum arabic, tragacanth gum and mixtures thereof.

The coating composition can be used in the process according to the invention as a solution, dispersion, gel, powder, paste, sol or in tabular form.

The coating composition is preferably in the form of an aqueous solution or dispersion. As the solvent or dispersant, water and / or an alcohol such as ethanol or propanol, or a diol, especially ethylene glycol, diethylene glycol and tetramethylene glycol and mixtures thereof can be used. The dispersant or solvent is particularly preferably water or an alcohol / water mixture with a water content of at least 70% by weight, based on the total weight of the solvent. Particularly preferred is water or a mixture of water and ethanol and / or propanol.

Because of possible contact with food, the coating agent is preferably halogen-free and free of polysiloxanes.

The cleaning method according to the invention is particularly suitable for the cleaning of the cooking chamber of so-called "combi steamers" and multifunctional cooking appliances, which are suitable for cooking, frying and deep-frying, of baking appliances or steaming appliances, which are used for example for the regeneration of already prepared foods. Such cooking appliances can contain other components such as heat exchangers or air baffles and accessories such as oven rack, crockery and / or cutlery in the oven. These components can be subjected to the process of the invention a quick and safe cleaning.

To carry out the cleaning process, it is possible to resort to the flushing and spraying devices known from the prior art, which are already used for the conventional automated cleaning processes.

The coating agent can be provided in a separate container in the cooking appliance or mixed before the cleaning process and fed to the cooking appliance. From the reservoir, the coating agent is pumped or sprayed at the scheduled time during the cleaning program in the cooking chamber and can there for a predetermined time on the surfaces to be coated to form the protective film.

The formation of the protective film can also take place in a drying step following the treatment of the cooking chamber with the coating agent. Preferably, the film formation takes place physically alone by drying and / or heating. In physical film formation, the volatiles of the coating agent evaporate during drying or heating, and the particles of the film forming component can flow into one another to form a substantially coherent protective film.

The protective film thus formed is sufficiently stable under the conditions of steaming food so that no transfer of components of the protective film to the food takes place.

According to a preferred embodiment, the components of the protective film, in particular the polymers and the particulate inorganic additive, are selected so that the adhesion of fats and / or other food residues to the protective film is made more difficult or completely prevented. In particular, the particulate inorganic additive in this embodiment is in the form of nanoparticles, especially in the form of modified silica particles. The use of nanoparticles affects the microstructure of the protective film surface in that between the protective film and the deposits act only low adhesion forces and the deposits can be easily removed in a following on the cooking process cleaning phase and optionally without the use of surfactant-based cleaning agents.

The protective film in this embodiment is preferably substantially stable to the treatment agents used in the cleaning phase, i. at least a predetermined number of cleaning phases, preferably 10 or more cleaning phases, can be carried out without refreshing the protective film in a coating phase. Since a removal of nanoparticles in the cleaning phase and a consequent change in the adhesion properties of the protective film surface can not be excluded, it is also provided in this embodiment that the protective film is renewed after a predetermined number of cleaning phases.

According to a further embodiment of the cleaning method according to the invention, it is provided that the protective film applied to the cleaned cooking surfaces is preferably completely removed in a cleaning phase following the cooking process and removed together with the deposits formed on the cooking chamber surfaces during the preparation of the food.

The removal of the deposits together with the protective film can be assisted or made possible by a number of measures which can also be combined with each other.

The components of the protective film and the treatment agents used in the cleaning phase are preferably coordinated so that the protective film is chemically attacked by the treatment agents. For example, the protective film may comprise cationically or anionically modified polymers which are dissolved by detergents of opposite polarity and removed from the cooking chamber surfaces.

According to one embodiment, the protective film is unstable to heating to a temperature which is above the temperatures occurring during the cooking process, preferably above about 250 ° C, more preferably above 300 ° C. The decomposition of the protective film can also be activated catalytically, for example by incorporation of metals and / or metal oxides or other inorganic decomposition catalysts.

According to a further embodiment it is provided, the detachment of the protective film by treatment with ultrasound or microwaves bring about or promote. In particular, the effect of the treatment agents used in the cleaning phase, such as cleaning agents, decalcifier, rinse aid and / or superheated steam can be enhanced by the treatment with ultrasound or microwaves before, during or after the execution of the purification steps.

The cooking chamber surfaces freed from the protective film together with the deposits and cleaned can then be treated again with the coating agent and provided with a fresh protective film.

The cleaning method according to the invention thus allows a simple and hygienic cleaning of the cooking chamber of deposits of fats and other food residues. In addition, the use of cleaning agents can be reduced.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19838864 C2 [0003]
• DE 10124703 [0004]
• DE 10134005 A1 [0004]
• DE 102004016821 B4 [0005]
• EP 2221357 A1 [0006]

Claims (18)

A method for cleaning a cooking appliance having at least one cooking chamber, wherein the method comprises at least one coating phase in which the cooking chamber is treated with at least one coating agent for applying a protective film on at least a portion of the cooking chamber, wherein the protective film reduces the adhesion of deposits and / or is at least partially replaced by on a cooking process following treatment steps together with deposits from the cooking process. A method according to claim 1, characterized in that the method comprises a cleaning phase with one or more of the following treatment steps: steaming the cooking chamber; Treating the cooking chamber with a pre-rinse; Treating the cooking chamber with a cleaning agent; Treating the cooking chamber with a descaling agent; Treating the cooking chamber with a rinse aid; Treating the cooking chamber with a post-cleaning agent; and drying the cooking chamber by treating with hot air. A method according to claim 2, characterized in that the coating phase is carried out during the cleaning phase. A method according to claim 2 or 3, characterized in that the coating phase is carried out after or instead of the treatment with a Nachreinigungsmittel. A method according to claim 2, characterized in that the coating phase is carried out subsequent to the cleaning phase. Method according to one of the preceding claims, characterized in that the coating agent contains a film-forming organic component. A method according to claim 6, characterized in that the film-forming component is selected from the group consisting of natural and synthetic waxes, natural and synthetic polymers, copolymers and oligomers and mixtures thereof. A method according to claim 7, characterized in that the wax has a melting point of above 60 ° C. Method according to one of claims 6 to 8, characterized in that the film-forming component comprises a polymer or copolymer from the group consisting of cellulose and cellulose derivatives, poly (meth) acrylates, polyesters, polyethers, polyvinyl alcohols, polyvinyl esters, polyamides and polyurethanes. Method according to one of claims 6 to 9, characterized in that the film-forming component contains a biodegradable polymer. Method according to one of claims 6 to 10, characterized in that the coating composition contains at least one film-forming aid. Method according to one of claims 6 to 11, characterized in that the coating agent contains a particulate inorganic additive, in particular in the form of nanoparticles. Method according to one of claims 6 to 12, characterized in that the coating composition contains one or more additives from the group of binders, gelling agents, viscosity modifiers, wetting agents, flow control agents, dispersants, emulsifiers, fillers and fragrances. Method according to one of the preceding claims, characterized in that the coating composition is used as a solution, dispersion, gel, powder, paste, sol or in tab form. A method according to claim 14, characterized in that the coating composition is used in aqueous or aqueous / alcoholic solution or dispersion. Method according to one of the preceding claims, characterized in that the coating phase comprises a drying step for removing volatile constituents of the coating agent and forming a substantially coherent protective film. Cooking appliance for carrying out a method according to one of the preceding claims, characterized in that the cooking appliance comprises a combi steamer, a multifunctional cooking appliance, a baking appliance and / or a food attenuation appliance. Use of a coating agent for cleaning a cooking appliance with a cooking chamber, wherein the coating agent comprises a film-forming organic component which forms a protective film in the cooking chamber, and wherein the protective film reduces the adhesion of deposits and / or following a cooking process Treatment steps along with deposits from the cooking process is at least partially replaced.