Printing inks

 

Printing inks.

 

Paint composition.

 

Colorants. Colorants are dyes or pigments. Pigments are dissolved in the binder, and no dyes. Pigments may be organic or inorganic. Organic pigments used for the production of transparent inks and inorganic pigments for the production of opaque paint.

 

 

Binder. Communication task glue stains from the surface of the printed product. Depend on the properties of the binder: adhesion of paint to the printed material drying methods, light fastness, the height of the paint layer, gloss, resistance to abrasion. The basis of the binder usually is the resin with a solvent which is responsible for the consistency of paint until it dries.

 

 

Additives. To improve the properties of the ink, there are various additives. Below are the main types of them. The producers may be other specialized additives.

• Solvents - reduce the viscosity of the paint.

• Inhibitors - reduce the viscosity of the paint and its rate of drying.

• flow improvers - improve the spreading of ink on the print, reduce the formation of small bubbles.

• Thickening - make the paint more viscous and thick.

• Antistatic - improve electrical conductivity of the paint, reduce the accumulation of static electricity, reduce static spray.

• hardeners and catalysts - improve paint adhesion to difficult materials.

• Matting pastes and powders - make the paint more matte.

• Toners - coloring additives that increase the luminosity (saturation) color.

Incorrect use of additives can worsen the properties of the paint. Therefore, always strictly follow the manufacturer's paint.

 

Basic parameters of the paint.

 

1. The type of the binder. Depend on the type of binder printed, operational and adhesive properties of the paint.

2. A method for drying (natural drying, convection, IR (infrared radiation), UV (ultraviolet radiation)). From the drying process depends on the speed drying and adhesion to substrates.

 

 

3. The degree of opacity (transparent, translucent, semi-opacity, opacity, superkroyuschaya). The degree of opacity indicates how tightly the paint layer can close the darker color printing material. When printed on transparent paint a black color, the color of the paint will not be visible. If the coating paint the floor, the paint color is dirty because of the color of the illuminated substrate. Superkroyuschie able to paint the most tightly black.

 

* Shows a print translucent colors on white and black substrates.

 

4. The height of the paint (low, medium, high). Height paint tells how thick the paint layer will remain after it is completely dry (relief print).

 

 

5. The level of gloss (paint supermatovaya, matte, velvety matte, glossy, superglyantsevaya). Gloss paint shows how much the paint layer can reflect or scatter light.

 

Properties screen and pad colors.

 

Screen inks should be short and have high thixotropic properties. The shorter ink, the better it gets out of mesh. The higher the better thixotropic beauty penetrates through the mesh.

Short paint. It is the ability of paint to break during the stretching. If you try to take the spatula paint from the can, over the spatula should not drag on long filaments. Paint, as if detached from its main mass.

Thixotropic properties. In screen printing ink should have a high thixotropic properties, i.e. the ability to increase its fluidity under pressure. During printing, the doctor blade exerts pressure on the ink, the ink becomes more fluid, then it is better to pass through the mesh to the printing substrate. The higher the thixotropic properties, the better the dye penetrates through the mesh.

Tampon paint must be long and have low thixotropic properties. The longer the paint, the more it moves on the surface of the tampon product. The lower the thixotropic properties, the sharper will be the edge of the print.

Long paint. It is the ability of paint to stretch under tension. If you try to take a long spatula paint from the can, over the long spatula should pull the thread.

Thixotropic properties. In pad printing ink should have a low thixotropic properties. At a pressure of paint tampon should not become more fluid.

 

Mixing colors in the catalog «PANTONE formula guaide».

 

3 ways to get the color inks in the catalog «PANTONE»

 

 

1. The first method is based on 16 basic colors and mixing formulations are registered in the directory «PANTONE». To do this, the paint manufacturer should supply basic colors in strict accordance with the basic colors of the catalog. See the first fan favorites. It must be borne in mind that the basic colors in the catalog translucent, so the formula is used instead of white transparent paint «trs. White ».

2. The second method is based on the mixing formulation supplied by paint manufacturer, which takes as a basis for their basic colors. Typically, the base colors of the manufacturer may be opaque and of different base colors in the catalog «PANTONE», so often a given recipe color is not exactly match the color of the directory, but tend to be very close (± 1 scale). Basic paint manufacturers can be translucent, semi-opaque and opaque. This method is the most accurate, since the company manufacturers engaged in selection of colors according to Pantone colors and the output is ready for mixing recipe.

3. The third way - a mix of colors "by sight" (do not recommend using this method), if there are no manufacturer's recipes and basic colors do not meet the basic colors of the catalog. To do this, the basis of a formula in the catalog «PANTONE», and basic colors are chosen from the closest color manufacturer. Thus it is necessary to choose the color base paint cleaner, it can be more saturated, but depends on its purity purity mixed colors. If the base color is selected dirty, the pure color is almost impossible to get. The notion of pure color can be represented by the triad of the primary colors (paints full-color images of CMYK). Process inks have a maximum color purity, as depends on the purity of colors in the full color image. Made of pure color dirty, very simply, for example, adding a black ink. Get dirty color of pure, almost impossible. If most of the colors producer dirty, get most of the colors on «PANTONE» will be impossible. When mixing colors on the "eye" need to know exactly what color when added to the paint will change its color to the desired shade. On the basis of mixing basic triad of colors we can see it quite clearly.

 

Human color perception.

 

Man is trichromats - retina has three types of receptors of light, are responsible for color vision. Each type of cone responds to a specific range of the visible spectrum. The response induced in the light cones specific spectrum called the color stimulus, wherein the light of different spectra can have the same color stimulus, and thus the same perceived by man. This phenomenon is called metamerism - two different emission spectra, but the same color stimuli are indistinguishable man.

 

 

Color Space incentives can be represented as a three-dimensional Euclidean space, if you set the coordinates x, y, z values as incentives, appropriate response cones longwave (L), medium wave (M) and short (S) range of the optical spectrum. The origin (S, M, L) = (0, 0, 0) will be of black color Blk. White color will have a clear position in this definition diagrams of various colors, and will be determined for example through the color temperature or after a certain white balance, or in any other way. Full color space man has the form of a cone in a horseshoe shape (as shown on the right).

 

Chromaticity coordinates Yxy.

 

 

 

Seen from this figure: when mixed in equal proportions purple with yellow turns red, yellow and blue green and blue with purple blue. If you change the mixing ratio, we can obtain a large number of intermediate colors from purple to yellow, from yellow to blue and from blue to purple.

Also in mixing paints must bear in mind the complexity of the colors. Simple color consists of 2 colors. Complex of 3 and 4 of the very complex. As a rule, more than 4 colors by mixing colors in the catalog «PANTONE» does not apply. The more colors are mixed, the more difficult to get accurate color «PANTONE». Adding a small amount (1-3%) of dark colors in the paint (black, dark blue, dark green, etc.) is recommended to dilute their transparent paint (the ratio of 3m or 4m 1k) for more accurate dosing. When mixing of colors must also be considered light. In areas under incandescent lamps and fluorescent color mixing will have a different hue. Color paint mixed on «PANTONE» can visually differ from the printout, if the product is not white. Also matte and glossy print of the same color on the «PANTONE» visually different from each other. Therefore, in the directory «PANTONE» There are two sections of glossy and matte colors. Glossy color has an index, and Matt U.

 

Mixing metallic colors.

 

 

Metallic color paint gold, silver pearl depends on the color or powder binder. In the bronze and silver shade of color depends on the color of bronze or aluminum powder as the powder is mixed with transparent varnish. In the shade of nacre depends on the color transparent base, as pearlescent mica-based powder has no color. If the binder is mixed with blue pearl powder, we'll get blue paint with a metallic sheen. Some manufacturers of paints, gold and silver is obtained on the basis of pearl powder color transparent base. In gold paint it yellow brown, silver-gray light. If you want to make a pearly gold lighter, you can add it in silver. If pearlescent gold have to do more than bronze, you need to add ruby transparent paint. As additives can be used magenta process inks. Number of powders to be added to the ink should not exceed 30% of its volume. We must bear in mind that if a series of colors used hardener, it must be taken based on the amount of binder instead of paint!

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