The present invention relates to a method for arranging a relief on a transparent plate.
The present invention also relates to a device to be used for this purpose.
In methods of the prior art for arranging a relief on a transparent plate use is made of a blasting technique, engraving technique, laser technique or an etching technique. It will be apparent that for etching in glass aggressive substances are necessary which are highly undesirable from an environmental viewpoint.
Blasting or treating glass in other manner is quite possible to perform per se but is labour-intensive and expensive work.
EP-A-0 614 857 provides a method and an apparatus for arranging a relief, wherein the above mentioned drawbacks are obviated.
This prior art method comprises the following steps:
The prior art apparatus further comprises:
Although this prior art method and apparatus are well suited for arranging reliefs with random patterns on glass, they are not suitable for arranging reliefs representing images on glass.
The aim of the invention is to provide such a method and an apparatus which are well suitable for arranging reliefs representing images onto glass.
This object is achieved in that the used shaping mould is a flat shaping mould, and that the pressing together of the glass plate and the mould takes place before the curing of the curable product.
The invention also relates to a device for arranging images on the surface of a transparent plate, wherein the shaping mould is flat and that the means for pressing the mould onto the glass plate are located upstream of the means for causing the curable product to cure.
It is noted that by separation of the pressing and the curing functions a mutual interference of these processes is avoided resulting in a higher quality image.
Attractive preferred embodiments of the present invention are specified in the sub-claims.
The invention will be further elucidated with reference to the annexed drawing, in which:
As shown in figure 1, a glass plate 1 provided with an image 2 is taken as starting point. According to the relevant embodiment of the present invention it is possible to copy the image 2 onto another glass plate 3. It is pointed out here that such a copy is made in mirror-image since during the copying process a mirror reproduction is manufactured. It will be apparent that instead of on a glass plate, an image can also be arranged on a transparent plate of another material.
An edge of self-adhesive tape 4 is arranged for this purpose on the edges of the second glass plate 3 onto which the image 2 must be copied. A recess 5 is arranged in the edge, for instance on one side. As will be explained later, this recess 5 serves to drain the excess curing material to be subsequently arranged.
After arranging the edge adhesive tape the remaining space of the glass plate is covered with a thin layer of curable material which adheres to the glass plate 3 during curing. Resin or lacquer 6 which cures when radiated with UV light is an example of such a curable material. This material is arranged with the most uniform possible thickness.
As also shown in figure 1, the glass plate on which the image 2 is situated is then placed on glass plate 3 with the image side toward glass plate 3, wherein glass plate 3 of course makes contact with adhesive tape 4 and the quantity of lacquer 6 enclosed between the adhesive tape. Any excess lacquer 6 will flow out via the opening 5.
The thus formed assembly 7 is subjected to a pressure force. A press can be used for this purpose, for instance such as is known in the graphic art for printing etches or lithographs, although it is also possible to make use of the pressing device 8 shown in figure 1.
This pressing device 8 is formed by a bottom roller 9 and a top roller 10, one of which, the top roller 10 for instance, is drivable in rotation by means of a motor or a hand crank. The rollers 9, 10 are further mounted such that they are urged toward each other so that a pressure force is exerted on the assembly 7. Excess lacquer 6 will herein flow out through the opening 5. A close contact is thus obtained between the lacquer layer 6 and the glass plate 3 to which the lacquer layer is applied. It is sometimes necessary to apply a layer for improving the adhesion between the lacquer and the glass. Such agents are easily obtainable. In order to enable curing of lacquer layer 6 use is made of a lamp 11 transmitting UV light which is placed in a reflector 12. This lamp 11 is arranged under the path followed by assembly 7 so that the lacquer 6 is radiated through the lower glass plate 3 and cures by means of the UV light.
It is pointed out here that it is possible to perform the same method without arranging adhesive tape. This results in a layer thickness which is perhaps less uniform so that the pressure between rollers 9, 10 must be adjusted more precisely. It is also prudent to take steps against spillage.
It will be apparent that instead of using lacquer curing with UV light and a UV lamp it is also possible to make use of lacquers which are sensitive to electromagnetic radiations of other wavelengths and to make use of a device for transmitting an electromagnetic radiation in the relevant wavelength.
By rotating rollers 9, 10 the entire assembly 7 is initially pressed together by rollers 9, 10 and then radiated by lamp 11, wherein the relevant lacquer cures.
As shown in the following illustration of figure 1, both glass plates 1, 3 are then separated from each other, for example by inserting a knife 13 or other sharp object between glass plates 1, 3. It is also useful to make use of a pressurized air line to blow air between the two glass plates once a start has been made.
It is noted out here that it is of course important that the UV lacquer only adheres to the smooth glass plate and not to the glass plate provided with the image 2 for copying. For this purpose it is important to pretreat glass plate 1 with a so-called "release" material This release material ensures that glass treated with a layer of this material does not adhere to any other material. An example of such a release material is the material which is sold under the name Clear Shield® and which is available from Ritech, in Raamsdonksveer, the Netherlands.
It will be apparent that the image, which is arranged on the original glass and which is visible through the roughness of the glass on particular parts thereof, is copied onto glass plate 3. The rough parts of the surface are in any case transferred by the resin, while the smooth parts of the resin are also transferred.
The image is moreover coloured by adding a quantity of stain to the lacquer. Repetition of this process with other colours can result in the effect of stained glass or antique glass.
The above described method and device are particularly suitable for copying a few glass plates.
It will be apparent that diverse modifications can be made to the thus described device without deviating from the appended claims.