CH376615A - Colorful metallic shine glass object - Google Patents

Description

The present invention relates to a glass object with a colored metallic luster, inter alia, products in which the aluminum has a shiny metallic appearance of gold color.

The objects according to the invention comprise a transparent film of a coloring substance interposed between one of their faces and an adherent aluminum coating. This coating may in particular be constituted by a deposit of aluminum obtained by spraying molten aluminum in the divided state.

Such products can be obtained by covering a surface of a glass article, such as a sheet of glass, with a coating made of a transparent coloring substance, a Color or a transparent Enamel, then by depositing on this coating a layer of molten aluminum. In this way, objects are obtained in which the aluminum has the color of the Color or transparent enamel and a shiny surface with a metallic luster. The applicant noted that it was not possible to use for this purpose, instead of the transparent enamel, opaque enamel which would not make it possible to obtain the desired metallic luster, the Color being generally dull and lifeless.

The colored aluminum is thus protected by the glass against any deterioration.

The objects according to the present invention are particularly suitable for architectural decorative effects, for example for the facade of buildings, shop fronts, etc., by placing the unreviewed face of the glass on the outside.

These objects can be made in different ways. In the case of sheet glass, for example, the Color or transparent enamel may be applied to the hot glass as it passes from the rolling mill to the annealing lathe with subsequent application of aluminum to the coated surface. colorful. The Color and the foil will be applied by any appropriate means; more conveniently using well-known, easy-to-use sprayers. The fixing <B>of</B> the Color or the enamel takes place During the Passage through the furnace and the aluminum is, in turn, fixed by fusion on the enamel. In the case of the use of a Color, it seems that the aluminum passes through it and attaches itself to the glass.

Sputtered aluminum does not adhere satisfactorily to glass below about 2350 C and to obtain good results the glass surface must be at a higher temperature. However, the glass temperature of the aluminum application must not be RTI ID="0001.0269" WI="7" HE="4" LX="1498" LY="1654"> such that the coloring film is plastic or semi-plastic and it must be sufficiently weak so that no disturbing oxidation of the aluminum occurs. In. In many cases, the glass must be at a temperature between 235 and 4500 C, preferably around 2650 C.

A Brilliant Gold Color is obtained by spraying red hot glass with a solution of Ferric Chloride (FeC13) which is converted to Iron Oxide and produces in combination with the aluminum surface a brilliant metallic gold-coloured sparkle. The amount of ferric chloride applied to the glass will have some influence on the appearance. For many uses, the most satisfactory Color and gloss are obtained with a quantity of Ferric Chloride giving the glass about 72% light transmission. Larger or smaller amounts of Ferric Chloride change the appearance of the glass due to changes in luster without, however, changing the Color. Thick coatings of ferric chloride can even be applied without. that: the coloring film becomes opaque. Other dyes convertible to oxides can be used, for example stannic chloride (SnCl4) which is converted to tin oxide (Sn0) or other metallic oxide dyes. These dyes must be applied to glass heated to a high temperature in order to convert the dyes into oxides. It is generally sufficient to heat, for this purpose, from 500 to 650° C. The transparent enamels which can be used for the present invention are found in the ceramic trade.

Although the invention has been described in its application to rolled and annealed sheets of glass, it is equally applicable to the production of tempered articles from cut sheets. One procedure is to apply the colorant or enamel to the hot glass as it comes out of the rolling mill, pass it through the furnace and then cut the annealed glass to size. The sheets are then quenched, or heat-treated. Ort knows that for this purpose the glass is heated above its annealing point and then rapidly cooled below its stress point. In one such application of the invention, the quenched sheets are suspended by pulse clamps passed through the quenching furnace where they are brought to a temperature above the annealing temperature and then cooled rapidly below the stress point by jets of water. of air applied on both sides. When the sheets have been brought to a temperature below approximately 450° C. but above 235° C., the aluminum is sprayed on the side bearing the coloring substance. For greater ease, the spraying of the aluminum onto the fire is carried out horizontally by a back and forth movement starting from the bottom and going up to the top. The sheets are then cooled to room temperature. The aluminum coating can be burnished, if desired.

Claims (4)

CLAIM Glass object with a colored metallic luster, in particular sheet of glass, characterized in that it comprises a transparent film of a coloring substance interposed between one of its faces and an adherent aluminum coating. SUB-CLAIMS 1. Object according to claim, characterized in that the coloring substance is a metal oxide. 2. Object according to claim, characterized in that the coloring substance is an iron oxide. 3. Object sedon claim, caractdris6 in that the coloring substance is a transparent 6mail. 4. Object according to claim, characterized in that it is constituted by a sheet of tempered glass.