BE1000451A3 - Process for multiple colors, according to offset zg process, printing of glass. - Google Patents

Abstract

The invention relates to a method for printing glass in multiple colors, according to the so-called offset process, characterized in that translucent ceramic paints are used to obtain the required color combination.

Description

       

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  "Method for printing in multiple colors, according to the R. offset process, glass printing"
This invention relates to a multi-color process according to z. G. offset process, printing on glass.



   Glass, and by this expression is meant all products from the glass industry, t. w. beer, lemonade, aperitif glasses and bottles, but also flat glass, are regularly printed in multiple colors. Machine printing in multiple colors means that letters, symbols or images display different side-by-side or superimposed flat strips. Each strip is covered with a solid opaque ceramic paint.



   This creates a figure in several colors, but there is no question of a combination of the colors to achieve a faithful reproduction of an original in several colors.



   In order to remedy this to some extent, use is sometimes made of a support (decalcomania), but this method cannot be compared to printing glass directly in multiple colors.



   The object of the invention is now to prescribe an original method which surprisingly prints in multiple colors according to the z. G. offset process.



   To achieve the required color combination, translucent ceramic paints are used for this purpose.



   According to the invention, the glass is covered before printing with the translucent ceramic paints, with a covering layer of paint as the background, to determine color in advance according to the effect to be obtained. Also possibly without

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 opaque underlay to get a totally transparent image.



   Other details and advantages of the invention will become apparent from the following description of a multi-color method according to z. G. offset printing process of glass, according to the invention. This description is given by way of example only and does not limit the invention.



   As set forth in the preamble, the invention has become so by the z. G. offset printing method to depict colored prints on glass, if not starting from a scene, but it is also clear that this can be done from a picture or a slide.



   It has now surprisingly been established that this was possible by using transparent ceramic paints.
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  The photograph, the print, preferably also a slide-positive image, is stretched on the rot of a scanner at an angle of approximately 230. A grid with 34 lines per cm is used and the different colors are successively screened; the red below 450, the blue below 750, the yellow below 900 and the black below 105 "to avoid the so-called moire effect. It is clear that the angle of grating may deviate from this preferred angle.



   A "cromalin" is produced from the cliche thus obtained in order to compare the colors desired to be obtained with screen printing.



   The sieve is stretched on a window with nylon or steel mesh. The mesh sizes are chosen according to the effect to be obtained. These sieves are treated with a z. G.



  "photo coat" in which the clichés are obtained by scanning are filmed.



   In order to achieve the desired offset result on glass, a white coat of paint is first applied to the glass as a substrate. The different transparent offset

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 colors (lemon yellow, cyan, magenta and black) are applied to this in a specific order according to the effect to be achieved.



   With this method and the use of transparent ceramic paints, z. G. hot pressure (thermoplastic) or cold pressure (paste).



   The effect obtained is surprising and for the first time a faithful reproduction of a print or slide in multiple colors can be obtained on glass, so that the same is now achieved on glass as an offset print on paper.



   The method applies to all glass carriers, as already explained in the preamble. This means that beer, aperitif or lemonade glasses as well as flat glass can be printed in this way.



   The final product obtained is highly resistant to chemical cleaning agents. Thus, glasses decorated according to the method can be treated in a dishwasher without damage to the applied multi-color reproductions.



   It is clear that the invention is not limited to the above-described embodiment and that many modifications could be made to it without departing from the scope of the patent application. This is especially true for the percentage shares of the constituent parts that are eligible for performing the method.


    

Claims (5)

 CONCLUSIONS 1. Method for multi-color, according to z. G. off set process, glass printing, characterized in that translucent ceramic paints are used to obtain the required color combination.  Method according to claim 1, characterized in that the printing with the transparent ceramic paints, the glass is printed with an opaque color (all possible colors) or without an opaque background, depending on the effect to be obtained.  Method according to one of claims 1 to 2, characterized in that starting from an image to be reproduced, preferably a slide-positive image, this image is clamped on the roll of a "scanner" at an angle of 20-250.  Method according to any one of claims 1 to 3, characterized in that a grid with substantially 34 lines per cm2 is used.    Method according to any one of claims 1 to 4, characterized in that the different usual colors are screened as follows: red 450, blue 750, yellow 900, black 1050 to avoid moire effect.