PVC film printing ink how color and precautions.
1. Carefully observe the color swatch, and special attention to observe is printed substrate from the substrate rough and smooth, reflecting the degree to select ink. For example, ink is printed on a smooth, highly reflective aluminum or cans, select high transparency of the ink, the ink will contribute greatly enhanced metallic luster.
2. When you select the desired color ink, Pvc film as much as possible to avoid mixing too much ink, try to use close to the standard color and ink made from a single pigment. Use color ink color, the more away from the standard colors, the brightness, the worse the higher the degree of mixing matte color out, is not possible by modulating the primary color.
3. Pay particular attention to the ink color strength. If the selected ink density is not high enough, no matter how blending, can not meet the standard color density.
4. When the need to add white, black ink, special attention should be weighed in electrical components and the accuracy of the added. In all the ink, white ink opacity exceptionally strong, Pvc film adding too much will not only dilute the color, but also prevent the substrate reflectance levels. However, for printing uneven substrates such as nylon, cardboard and, in order to ensure the appearance of printed materials, the best printing white as a background layer. Due to the exceptionally strong coloring black ink, a little careless adding too much, we need to add quite a bit of other color ink to adjust the color, wasteful, and therefore in need of special attention.
5. The production of light-colored ink, the ink film should determine the extent of light transmission should be added to the number of white ink or varnish (diluent) toning. Absolutely not allow the solvent (dilution water) is used to dilute colors. Solvent is added too much, not only will affect the printing performance, and will destroy the ink structure, resulting pigment and resin oil separation, precipitation or greatly reduced ink gloss.
PVC is a kind of vinyl polymeric material, the material is a non-crystalline materials. Pvc film PVC material in actual use, often by adding stabilizers, lubricants, auxiliary processing agents, pigments, impact agents and other additives. Easily flammable, high strength, resistance to climate variability and excellent geometric stability. PVC of oxidants, reducing agents and strong acids have a very strong resistance. However, it can be concentrated oxidizing acids such as concentrated sulfuric acid, concentrated nitric acid corrosion and does not apply to contact with aromatic hydrocarbons, chlorinated hydrocarbons occasions.
6. Methods to improve the printing ink film luster
(1) within the allowable range in color density, add appropriate amount of varnish.
(2) in the printing ink film coated with a layer of varnish or varnish.
(3) increase the transparency of ink, such as the use of high ink transparency or add the right amount of varnish, use smooth, reflected by strong base increase gloss.
(4) prevent the substrate surface adsorption reasonable degree of improvement smooth printing surface of the substrate.
(5) Note that the printing environment of temperature and humidity. Pvc film under high humidity, the temperature is low, be printed plastic, due to solvent evaporation speed (usually within one minute of the ink had dried film surface), the ink film to absorb the surrounding heat caused by water vapor in the air dramatically HERE condensation formed on the surface of the printed ink film fog, resulting in ink and dull. In the rainy season, we should pay special attention to controlling the printing environment of temperature and humidity, to ensure good printing results.
7. Fluorescent ink can not be a large number of non-fluorescent ink mixed color, otherwise they will lose the ink fluorescent effect.
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