Cooking appliance door with an inner borosilicate glass window pane and cooking appliance with said door

Abstract

The cooking appliance door has a borosilicate glass inner window pane, on which a paint layer and an infrared-reflecting layer are applied. The paint layer is high-temperature-resistant non-enamel paint with an organic or inorganic binder. In order to provide especially good adherence and high scratch resistance for the paint layer, the paint layer is applied directly on one side of the inner window pane and the infrared-reflecting layer is applied on and over this paint layer. A cooking appliance with this cooking appliance door is also part of this invention.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to a cooking appliance door with an inner window pane comprising a borosilicate glass, on which a paint layer made from a high-temperature-resistant non-enamel paint with an organic or inorganic binder and an infrared-reflecting layer are applied. The invention also relates to a cooking appliance with this sort of door. [0003] 2. Description of the Related Art [0004] A household cooking appliance, especially an oven, has a cooking chamber or compartment with an opening, which is closable by a cooking appliance door with an observation or viewing window. Cooking appliances with a door that is completely glass are known. A baking oven with an oven muffle acting as cooking compartment is a typical currently known household appliance. This sort of baking oven has been equipped to a large extent with a pyrolytic self-cleaning means, by which cooking residues are decomposed to ash at pyrolysis temper...

AI Technical Summary

Benefits of technology

[0012] It is an object of the present invention to provide a cooking appliance door of the above-described type with an inner window pane comprising borosilicate glass, which has an infrared-reflecting coating and printing, such that the printing reliably adheres to the window pane and resists scratching.

[0016] Because of the critical feature of the invention, i.e. the application of infrared-reflecting layer after applying the color printing or paint layer to the inner window pane, one very advantageously obtains a resistant color printing on the inner window pane of borosilicate glass. Besides greater adherence of the paint layer on the glass substrate the color printing is also scratch-resistant, since the infrared-reflecting layer is very hard and thus mechanically protects the printed information provided by the non-enamel paint. Furthermore use of the non-enamel paint in this manner also maintains the impact strength for impacts occurring on the side of the inner window pane opposite from the side bearing the printing. The printing also can be provided on the side of the inner window pane facing away from or opposite from the cooking compartment. In that case there are no interactions between the coating and the cooking compartment.

[0017] Of course the color printing can also be provided on the side of the inner window pane closest to or facing the cooking compartment, especially with the infrared-reflecting coating covering the color printing. Thus the occurrence of printing with paint portions in the cooking compartment is at least reduced.

Problems solved by technology

High-quality glass is used for door panels of cooking appliances because of this high heat load.

Since the current enamel paints are not heavy-metal-free, especially not lead-free, there is a danger the heavy metals, especially lead, could be volatilized in the cooking compartment at higher operating temperatures because of the color printing on the exposed side in direct contact with the cooking compartment.

Furthermore the enamel paint coating has a rough, unpleasing surface.

This leads to certain process uncertainties and unreliabilities, since the adherence of the paint developed for direct application to borosilicate glass is not guaranteed on an infrared-reflecting coating.

Furthermore the above-described paint coating is not very resistant to scratching.

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