ES2349987B1 - PROCEDURE TO SERIGRAPH IN GLASS. - Google Patents

Abstract

Procedure for screen printing on glass, from application in all those glass industries for your application under construction, both for outdoor and for interiors, so that starting from the image to screen print the Procedure includes: a) Obtaining the image, photograph or creation of a life-size design or a scale that allows its reproduction on glass; b) Decompose the original image into as many colors as you want to print on the glass, keeping the effect of volume and depth; c) Transform the images that they will be formed by continuous tones, in a plot of points, lines or other geometric figures of varying density; d) Elaborate so many photoliths as colors you wish to print; e) Obtaining through screen printing photolithography that reproduces images transformed; f) printing using screen printers elaborated

Description

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Procedure to screen print on glass.

Object of the invention

The following invention, as expressed in the set forth herein, refers to a procedure for screen printing on glass, in order to obtain any type of image with a three-dimensional effect, effects of volume or perspective and continuous tonal variations based on dotted patterns, lines or any other geometric motif of variable size or thickness.

Thus, any image can be obtained with a three-dimensional or volume effect in one color or in several colors with a resolution adapted to the application to which it will be destined the decorated glass, being able to be the painting of vitrified printing or not.

Scope

The procedure for screen printing on glass is of application in all those glass industries, being of special application in glass used in construction, both of inside and outside, by allowing the printing of drawings, corporate and ornamental texts or motives.

Background of the invention

With the passage of time the glass has incorporated as a material of great relevance in construction of buildings, both for interior use (decoration, separation of spaces, etc.), as for exterior use (facades, shop windows, etc.), and in order to achieve customization or aesthetics desired have been using different techniques.

One of these techniques is to adhere to glass a plastic material, usually vinyl, precut to the shape and dimension required to obtain the motif, label or desired logo This technique has the disadvantage of its withdrawal durability, especially for outdoor applications such as case of the facades.

Another alternative is to use a sheet transparent plastic on which it is printed by digital means The desired image or logo. This printed sheet is assembled between two glasses using sheets of polyvinyl butyral type (PVB) or ethyl vinyl acetate (EVA). Being the inconvenience of this technique its high production cost and the impossibility of Get opaque decorations.

\hbox{fotolitográfica bloquea las zonas
de la pantalla por donde no pasará la pintura.}

Also, screen printing glass has been used, such as decorated tempered glass, useful in the interior and exterior of buildings that allows the printing of drawings, texts, etc., so that for this purpose the printing procedure is used by silkscreen, consisting of the use of a textile screen (silk, polyester, etc.) of spinning and certain openings, on which the reverse of the drawing to be printed is created by photolithographic means, so that the emulsion

 \ hbox {photolithographic blocks zones
of the screen where the painting will not pass.} 

In this way, it is possible to print decorations, texts or logos on glass. The added advantage of this technique compared to others is that it allows the use of paints vitrifiable that have extraordinary durability.

However, the use of this technique limits the possibility of reproducing images or designs that have a variety of tones or density as usually occurs in images that provide a sense of depth, resulting in flat and nuanced decorations that restrict the use of this type from decorative technique to the application of texts, logos or designs blueprints.

Description of the invention

This document describes a procedure developed for screen printing on glass decorations based on images, photographs or drawings that originally present a continuous tonal variation and that cannot be directly Screen printed on glass.

The procedure solves the problem mentioned previously regarding the limitation in the type of decoration allowing the printing of images, photographs or designs with three-dimensional or volume effect. Also being able to use vitrifiable paints so that a decorated glass of maximum durability, ideal for use on facades or in interiors

The procedure developed to obtain a glass with a decorative print that reproduces a faithful image or a design that achieves the desired depth and volume effect It comprises the following steps:

TO.

Obtaining the image, photograph or creation of a life-size design or a scale that allows its reproduction on glass.

B.

Decompose the original image into as many colors as you want to print on the glass, keeping the effect of volume and depth of the original image.

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C.

Transform the images so obtained, and that in general will be formed by continuous tones, in a plot of points, lines or other geometric density figures variable.

D.

Make as many photoliths as colors they wish to print from this decomposition of the image original in dotted frames.

AND.

Obtaining by photolithography of silkscreen screens of photosensitive emulsion coated fabric that reproduces the transformed images.

F.

Screen printing screenprints made of each of the converted designs of the original image on the glass.

G.

In a practical execution, the glass can be passed through an oven of vitrified to achieve the fusion of the painting doing Permanent and lasting decoration.

Through this procedure the Reliable reproduction of designs, images or photographs that endow to the glass of a decoration with volume effect reproducing the tonal variations of the original image.

The glass can be passed through an oven vitrified to achieve the fusion of the paint doing Permanent and lasting decoration.

Each of the photoliths and screens of silkscreen allow you to print the color in which it has been decomposed The original image.

The punctual impression of the painting on the glass, through the corresponding screen, is presented according to different densities or lines giving it an effect three-dimensional, volume, or continuous tonal variations observed at a distance.

To complement the description that is going to be carried out below, and in order to help a better understanding of the characteristics of the invention, this descriptive report is accompanied by a set of drawings, whose figures are illustrative and not limiting , the most characteristic details of the invention are represented
tion.

Brief description of the designs

Figure 1.- Shows a view of an impression screen printing, being able to observe the screen printing screen, the glass on which the impression and the drag spatula of the painting.

Figure 2.- Shows a view, within the Multiple variables, of a variation of gray tones.

Figure 3.- Shows a view, within the multiple variables, of a plot of points.

Figure 4.- Shows a view of the resolution Effective of the human eye.

Figure 5.- Shows a view of an image original.

Figures 6 and 7 show a decomposition of the two colors that make up the image.

Figure 8.- Shows a view of a detail of the Figure 6 of the decomposition at points of variable density.

Figure 9.- Shows a view of the final result Once the two designs are printed on glass.

Description of a preferred embodiment

In view of the commented figures and of according to the numbering adopted we can observe how, starting of the design, image, photograph, text, etc., that is desired screen printing, the procedure to reproduce the original image on the glass is based, first of all, on obtaining the image, photography or creation of a life-size or scale design that allows its reproduction on glass, that is, according to the measures to which it will be screen printed on the glass, whose Obtaining can be done by computer (Figure 5).

The original image is broken down into so many designs such as colors are to be applied (figures 6 and 7). The designs thus obtained they are treated digitally to obtain from each of they are hatched in points or lines of variable density (figure 8).

As an example of application of the procedure described above, we can influence that it is based on which: based on an original image (figure 5) is done by digital media separating the colors that form the image, in this case black and white (figure 6 and 7).

These two images are transformed into frames of points of variable density, in our case with a line of 6 lines per centimeter (figure 8). From these images you they get the screen printing screens for printing on glass, so that the decoration faithful to the original image (figure 9).

Once these life-size designs are obtained they are reproduced in a photolith for each design that you want to print, that is, for each color in which the image has decomposed original one must obtain a photolith, and from these photoliths different screen printing screens are made.

Then with the glass to be screen printed placed in the screen printing system, they will be available successively the different screens 1 and on them will be impregnated the painting 5 relative to each of them, letting pass, by points, in greater or lesser density depending on the areas, the paint (Figure 1). In said figure 1 it will be observed as by means of a scraper or rubber spatula 2 drag the paint 5, on the address 3, in order to materialize the impression on the glass 4. Between each successive impression a drying is carried out that eliminates the solvents integrated in the paint.

The glass 4 thus obtained can be passed through a vitrified oven or not, being ready for utilization.

The image thus obtained has an effect three-dimensional that corresponds to the three-dimensional image a reproduce (figure 9), which has great decorative value, since which will allow the reproduction of any corporate image, being a faithful reproduction of it.

On the other hand, each of the screens elaborated screen printing allows printing the color in which it has been decomposed the image, so that it is possible to obtain a image of a single color or of several colors.

Printing through screen 1 is made using a scraper or rubber spatula 2 that forces the 5 paint to go through those parts of the screen that are not sealed by the emulsion, as shown in figure 1.

Preferably, the spinning of the screens Screen printing will be between 49 and 90 threads / cm to allow its use with vitrifiable ceramic paints.

Moreover, the decomposition of the image in different colors and the transformation of these images into dot patterns or lines of varying density create the feeling observed at a distance to reproduce tone variations you continue While a continuous tone image has a range infinite colors or grays, the transformation into dot patterns Reduce the image to a single color.

The effect of continuous tone simulation using semi-tone points is based on an effect optical determined by the limit resolution of the human eye, of so that from a certain distance the plot of points it is integrated by the eye giving the sensation of observing a variation keep going. Given that the angular resolution limit of the human eye is 0.02º the distance between rows of adjacent points or lineura must be determined from the typical distance to which is going to be observed the image.

Preferably, for application on facades in which the glass will be observed at distances greater than 3 m, the appropriate lineura of the plot of points or lines will be between 4 and 15 lines per centimeter, although it is possible use other guidelines if the application requires it.

In short, it's about getting a sharp image with a three-dimensional effect, allowing the reproduction of any image, photograph or design, so that focusing on an industrial application of great relevance, the reproduction of three-dimensional corporate images, such as they are really used, and provide the facades of buildings with a unique and personalized image and aesthetic appearance.

In figure 4 of the designs you can see how:

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Observation distance 1 m .: lineatura recommended 1 / 0.35x10 = 30 lines / cm.

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Observation distance 3 m .: lineatura recommended 1 / 1.0x10 = 10 lines / cm.

Claims (2)

1. Procedure for screen printing on glass, being applicable in all those glass industries for application in construction, both for exteriors and interiors, characterized in that, starting from the image to be screen-printed, the procedure includes:

TO.

Obtaining the image, photograph or creation of a life-size design or a scale that allows its reproduction on glass.

B.

Decompose the original image into as many colors as you want to print on the glass, keeping the effect of volume and depth of the original image.

C.

Transform the images so obtained, and that in general will be formed by continuous tones, in a plot of points, lines or other geometric density figures variable.

D.

Make as many photoliths as colors they wish to print from this decomposition of the image original in dotted frames.

AND.

Obtaining by photolithography of silkscreen screens of photosensitive emulsion coated fabric that reproduces the transformed images.

F.

Screen printing screenprints made of each of the converted designs of the original image on the glass.

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2. Procedure for screen printing on glass, according to claim 1, characterized in that the glass can be passed through a vitrified furnace to achieve the fusion of the paint making the decoration permanent and durable.