WO2012085775A2

WO2012085775A2 - Food‑carrier holder

Info

Publication number: WO2012085775A2
Application number: PCT/IB2011/055697
Authority: WO
Inventors: Juan Jose Galindo Perez
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2010-12-22
Filing date: 2011-12-15
Publication date: 2012-06-28
Also published as: WO2012085775A3; ES2394703B1; ES2394703A2; ES2394703R1

Abstract

The invention proceeds from a food‑carrier holder with at least one component (10) made of a material having a density of less than 6 g/cm³. In order to provide a food‑carrier holder of the type in question which makes it possible for an oven to be highly energy efficient and, at the same time, combines high mechanical and chemical strength with advantageously straightforward and cost‑effective production, it is proposed that the food‑carrier holder has a protective layer (12) which is arranged on the component (10) and comprises an oxide and/or a hydroxide.

Description

Garguttragerhaltevomchtung

The invention is based on a Garguttragerhaltevomchtung according to the preamble of claim 1.

From DE 102 40 146 A1 a Garguttragerhaltevomchtung is known, which consists at least partially of aluminum and having a ceramic coating.

The object of the invention is in particular to provide a generic Garguttragerhaltevomchtung that allows high energy efficiency of a cooking appliance and at the same time combines high mechanical and chemical resistance and an advantageous simple and inexpensive production in itself. The object is achieved by the features of

Patent claim 1 solved, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.

The invention is based on a product carrier holding device with at least one component made of a material having a density of less than 6 g / cm ³ .

It is proposed that the food rack holding device comprise a protective layer comprising an oxide and / or a hydroxide, which is arranged on the component. In particular, the density of the material is less than 5 g / cm ³ , preferably less than 4 g / cm ³ and particularly advantageously less than 3 g / cm ³ . A "product support device" is to be understood in particular to mean a device which is provided for holding and / or guiding a food support within a cooking ring of a cooking appliance, in particular an oven the product support holding device may be at least partially embodied in one piece with the cooking ring formed the Garmuffel molded support surface for the food support. Preferably, in this case, the Garmuffel is at least partially formed from the material and in particular at least one inside of the Garmuffel completely covered by the protective layer. Furthermore, the food support holding device can be designed as a holding device for the food support arranged on a baking tray of a baking oven. Preferably, however, the food support holding device comprises a carrier unit attached to the muffle and / or placed in the muffle for the food support. In particular, the food support holding device may comprise a telescopic extension for the food support. By "provided" is meant in particular specially designed and / or equipped and / or programmed. "A" food support "is to be understood in particular a plug-in unit which is intended to be inserted into a muffle of a cooking appliance and to accommodate and / or to wear. Preferably, the food support comprises a grate and / or a Garblech and / or a grease trap. A "material" of the component is to be understood as meaning, in particular, a pure substance or a mixture of substances from which the component at least partially and preferably completely consists Preferably, the material comprises a metal and / or a metal alloy the component to be understood, which is intended to provide protection of the component against mechanical stress, in particular abrasion, and / or chemical stress, in particular corrosion and / or exposure to solvents and / or cleaning agents. In particular, the protective layer has a strong adhesion to the component and a greater hardness and / or a greater corrosion resistance than the component. By the fact that the protective layer is arranged "on the component", should be understood in particular that at least one outgoing from at least one point of the component beam first passes in the component, then penetrates an interface between the component and the protective layer and finally extends in the protective layer The protective layer is preferably arranged on points of the component which are visible in an assembled state and / or on locations with increased mechanical and / or chemical stress on the component. In particular, the component may be partially covered by the protective layer. Preferably, however, the component is completely covered by the protective layer. An "oxide" is to be understood as meaning, in particular, a chemical oxygen compound in which an oxygen has an oxidation number of -II Preferably, the oxide is an oxide of one of the substances present in the material of the component, in particular a metal oxide. In particular, a salt-like substance is to be understood which contains hydroxide ions OH ^" as negative lattice constituents. [Vorzugsweise Vorzugsweise] The hydroxide is preferably a hydroxide of one of the substances present in the material of the component.

Such a configuration makes it possible to achieve a high level of energy efficiency of the cooking appliance having the cooking support holder device. In particular, due to a low mass of the food support holding device, a heating time of the cooking appliance can be shortened to a temperature selected by an operator. At the same time, an advantageously high chemical and mechanical resistance can be achieved by the protective layer. By virtue of the protective layer having an oxide and / or a hydroxide, it is advantageously possible to make simple and cost-effective production processes for the protective layer, in particular an electrolytic oxidation.

It is also proposed that the material comprises at least aluminum. Preferably, aluminum is a major constituent of the material. The term "aluminum being a main constituent of the material" should in particular be understood to mean that a mass fraction of aluminum in the material is at least 60%, preferably at least 70% and particularly advantageously at least 80% Substantially pure aluminum "Aluminum which is essentially pure" is to be understood as meaning, in particular, aluminum having a purity of at least 97%, preferably at least 98% and particularly advantageously at least 99%. As a result, a lightweight component for the food support holding device can be provided at low cost. Advantageously, the protective layer comprises aluminum oxide. The term "aluminum oxide" is to be understood as meaning, in particular, a chemical compound of two aluminum atoms and three oxygen atoms.The aluminum oxide is preferably present in the form of largely amorphous .gamma.-aluminum oxide. , preferably more than 70%, and more preferably more than 80%, in an amorphous phase. As a result, a protective layer can be provided inexpensively and with the aid of a simple method. In a preferred embodiment, it is proposed that the protective layer is made at least partially by hard anodization of the component. By "hard anodizing" is meant, in particular, a process for the electrolytic oxidation of an aluminum material to produce a protective layer on the aluminum material which uses a cooled, especially acidic electrolyte Preferably, the electrolyte used is sulfuric acid, in particular from 10 to Preferably, during the electrolytic oxidation, an electrical voltage is increased stepwise, starting from 10 V to 100 V. Preferably, the electrolyte is heated to a temperature of less than 5 ° C, preferably less than 3 ° C and more preferably cooled to about 0 ° C. Through a

Cooling of the electrolyte, higher currents can be achieved during the electrolytic oxidation, whereby an advantageously thick and mechanically particularly resistant alumina layer can be created. Furthermore, this can effectively prevent unfavorable discoloration of the food support holding device during a pyrolytic self-cleaning operation of the cooking appliance. Furthermore, a food hygiene surface can be created. In particular, further process steps can follow after the hard anodization. Preferably, the protective layer is densified in hot, preferably demineralized water. By "hot water" is meant, in particular, water below a boiling point and at a temperature of at least 90 ° C., preferably of at least 95 ° C. and particularly advantageously of about 96 ° C. In particular, it is to be understood that pores in the hard-anodized aluminum oxide layer are reduced and preferably sealed.Preferably, the protective layer is impregnated with PTFE after compression.Type PTFE is intended in particular to be an unbranched, linearly structured, partially crystalline polymer of fluorine and carbon are understood. As a result of these refinements, mechanical and chemical properties of the food carrier holding device can be further improved.

In a particularly preferred embodiment, it is proposed that a thickness of the protective layer is at least 5 μm. In particular, the thickness is at least Ι Ο μηη, preferably at least 20 μηη and particularly advantageously at least 30 μηη. In particular, the thickness of the protective layer is greater than a thickness of a natural aluminum oxide layer which forms, in particular, on each aluminum component exposed to an ambient air. A "thickness of the protective layer" is to be understood as meaning in particular a shortest distance between a surface of the component and a surface of the protective layer facing away from the component, thereby making it possible to provide a product support holding device with particularly advantageous mechanical, chemical and thermal properties.

Advantageously, the protective layer has a Vickers microhardness of at least 350 mHv 0.025. In particular, the microhardness according to Vickers is at least 400 mHV 0.025, preferably at least 450 mHV 0.025 and particularly advantageously at least 500 mHV 0.025. In this way, a food support holding device with a particularly high mechanical resistance can be provided.

It is also proposed that the protective layer at least briefly withstand a temperature of at least 1800 K. In particular, the protective layer at least briefly withstands a temperature of at least 1900 K, preferably of at least 2000 K and particularly advantageously of at least 2100 K. Under which "the protective layer at least briefly a temperature is resistant to at least x ", it should be understood in particular that the protective layer can withstand at a sufficiently slow heating to the temperature x of the temperature x at least for a period of 5 s, preferably 15 s and particularly advantageously 30 s without damage "Sufficiently slow heating" should be understood in particular a temporal increase in temperature, which is slow enough to avoid thermal stresses. As a result, a high thermal resistance of the protective layer can be achieved. In a further embodiment of the invention, it is proposed that the carrier carrier holding device has an anti-adhesive layer which is arranged at least partially over the protective layer. An "anti-adhesion layer" is to be understood in particular as a layer whose wettability is less than a wettability of the protective layer and whose coefficient of static friction upon contacting with any material sample is preferably less than a static coefficient of adhesion of the protective layer upon contacting with the same material sample For example, the static friction coefficient of the anti-adhesion layer upon contact with the material sample is identical with a sliding friction coefficient of the anti-adhesion layer upon sliding the material sample over the anti-adhesive layer

In particular, it is to be understood that portions of the anti-adhesion layer are disposed on a side of the protective layer facing away from the component, Preferably, a thickness of the anti-adhesive layer is 1 μm to 5 μm and more particularly Preferably, a "thickness of the anti-adhesion layer" is to be understood in particular a shortest distance between a surface of the protective layer and a surface of the anti-adhesive layer facing away from the protective layer. As a result, a cleaning effort can be advantageously reduced. Furthermore, ease of use can be increased by a low friction between the food carrier and the component of the product carrier holding device. In a preferred embodiment of the invention, it is proposed that the anti-adhesive layer comprises PTFE. Preferably, the anti-adhesive layer is formed entirely of PTFE. In this way, an anti-adhesive layer can be provided with an advantageous chemical and thermal resistance, which is advantageously poorly wettable.

Furthermore, a method for producing a food rack holding device with at least one component made of a material having a density of less than 6 g / cm ³ and a protective layer comprising an oxide and / or a hydroxide, which is arranged on the component, is proposed. Preferably, the component comprises aluminum. Particularly advantageously, the protective layer is produced by hard anodization of the component. This can be created in a cost effective manner an advantageously resistant protective layer.

Furthermore, a cooking appliance, in particular an oven, proposed with at least one Gargutträgerhaltevorrichtung invention. In particular, the Gargutträgerhaltevorrichtung is disposed within a Garmuffel the cooking appliance. Preferably, the cooking appliance comprises a pyrolysis function for a pyro- lytic self-cleaning of the Garmuffel. In this way, a cooking appliance can be provided, the food support holder device can remain without discoloration during a pyrolytic self-cleaning in the Garmuffel.

Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations. 1 shows a perspective view of a side wall of a cooking ring of a cooking appliance with a food carrier holding device according to the invention,

Fig. 2 shows a part of the Gargutträgerhaltevorrichtung in a not to scale sectional view along a line II-II in Fig. 1 and

Fig. 3 is a diagram for the method of hard anodizing.

1 shows a perspective view of a side wall 15 of a cooking door 17 which can be closed by means of a cooking appliance door 16 of a cooking device 20 designed as an oven 18. The cooking appliance 20 comprises a food support holding device 22, which is provided for placing a food support. The Gargutträgerhaltevorrichtung 22 comprises two components 10, wherein each of the components 10 is screwed to one of the two opposite side walls 15 of the Garmuffel 17. FIG. 1 shows one of the two components 10. The component 10 comprises aluminum and has a density of 2.7 g / cm ³ . The component 10 is designed like a lattice and forms at different heights bearing surfaces for a food support. Due to the low density of the aluminum, a total mass of the product carrier holding device 22 is relatively small, compared to conventional steel food carrier holders, whereby a lower energy consumption can be achieved.

2 shows a section representation, not true to scale, of a portion of the product support holding device 22. The product support holding device 22 has a protective layer 12 of aluminum oxide, which is arranged on the component 10. The protective layer 12 surrounds the component 10 on all sides. The protective layer 12 is made by hard-anodizing the component 10. The protective layer 12 has a thickness of approximately 30 μm. The protective layer 12 has a Vickers microhardness of about 500 mHV 0.025. The protective layer 12 at least briefly withstands a temperature of 2100 K. Through the protective layer 12 the aluminum of the component 10 is protected against mechanical action and corrosion. On the other hand, the protective layer 12 prevents discoloration of the food rack holding device 22 during a pyrolytic self-cleaning operation of the cooking appliance 20. The food rack holding device 22 further comprises an anti-adhesion layer 14 formed of PTFE, which is disposed over the protective layer 12. The anti-adhesion layer 14 has a thickness of 3 μm. By the anti-adhesive layer 14, a small cleaning effort of the Gargutträgerhaltevorrichtung 22 can be achieved. During the pyrolytic self-cleaning operation of the cooking appliance 20, a temperature of at most 360 ° C must be maintained to avoid the formation of poisonous PTFE vapors. In an alternative embodiment, it is conceivable that an anti-adhesion layer is dispensed with. In this case, a pyrolytic self-cleaning operation can be performed even at temperatures above 360 ° C. Fig. 3 shows a diagram of the method of hard anodizing. Here is the

Component 10 immersed in a 15 percent sulfuric acid 24, which is located in a container 30. The sulfuric acid 24 is cooled to a temperature of 0 ° C. The component 10 is connected as an anode 26 to a DC voltage source 28. The electrically conductive container 30 is connected as a cathode 32 to the DC voltage source 28. The component 10 and the container

30 are spaced by electrically insulating spacers 34. The container 30 and the spacers 34 are each made of a material which can withstand the sulfuric acid 24. The DC voltage supplied by the DC voltage source 28 is incremented between 10 V and 100 V until the desired thickness of the protective layer 12 is reached. After completion of the hard anodization, the component 10 is heated with the protective layer 12 to 400 ° C, whereby a discoloration of the protective layer 12 occurs. After cooling, the protective layer 12 retains its color in all subsequent heats. The anti-adhesion layer 14 is then applied by impregnation of the protective layer 12. In alternative embodiments, a Garguttragerhaltevorrichtung also include a telescopic extension for a food support. Alternatively, a Garguttragerhaltevorrichtung also be designed as a arranged on a baking tray holding device for a food support, which is moved when opening and closing a Garmuffel a baking oven together with a cooking appliance door of the oven relative to Garmuffel. It is also conceivable that a food support holding device is formed in side walls of a Garmuffel a baking oven.

reference numeral

10 component

12 protective layer

14 anti-adhesive layer

15 side wall

16 cooking appliance door

17 Garmuffel

18 oven

20 cooking appliance

22 Gargutträgerhaltevorrichtung

24 sulfuric acid

26 anode

28 DC voltage source

30 containers

32 cathode

34 spacers

Claims

claims

Food product holding device with at least one component (10) made of a material having a density of less than 6 g / cm ³ , characterized by a protective layer (12) comprising an oxide and / or a hydroxide, which is arranged on the component (10).

Gargutträgerhaltevorrichtung according to claim 1, characterized in that the material comprises at least aluminum.

Gargutträgerhaltevorrichtung according to claim 1 or 2, characterized in that the protective layer (12) comprises alumina.

Gargutträgerhaltevorrichtung according to claims 2 and 3, characterized in that the protective layer (12) is at least partially made by hard anodization of the component (10).

Gargutträgerhaltevorrichtung according to any one of the preceding claims, characterized in that a thickness of the protective layer (12) is at least 5 μηη.

Gargutträgerhaltevorrichtung according to any one of the preceding claims, characterized in that the protective layer (12) has a micro-hardness according to Vickers of at least 350 mHV 0.025.

Gargutträgerhaltevorrichtung according to any one of the preceding claims, characterized in that the protective layer (12) at least for a short time a temperature of at least 1800 K resists. Garguttragerhaltevornchtung according to any one of the preceding claims, characterized by an anti-adhesive layer (14) which is at least partially disposed over the protective layer (12).

Garguttragerhaltevornchtung according to claim 8, characterized in that the anti-adhesive layer (14) comprises PTFE.

A method for producing a Garguttragerhaltevornchtung with at least one component (10) made of a material having a density of less than 6 g / cm ³ and an oxide and / or a hydroxide comprising protective layer (12) which is arranged on the component (10) , in particular according to one of the preceding claims. 1. cooking appliance, in particular oven, with at least one Gargutträgerhal- tevorrichtung according to any one of claims 1 to 9.