Printed products are both printed products and a general term for a variety of finished products produced using printing technology. In our daily life, we see brochures, newspapers, books and magazines, maps, advertising posters, envelopes and letterheads, trademarks, business cards, invitations and greeting cards, banknotes, calendars and calendars, various cards, packaging boxes and so on, all belong to the category of printed products. Printed materials are filled in almost all areas of people’s clothing, food, housing and transportation, and are closely related to people’s lives. Our lives are getting better and better, and the quality of printed materials is getting higher and higher. There are many factors that determine the quality of a print. In addition to the production and quality control process, the quality of the ink can significantly affect the production cost and the final result of the print. Here we will analyze some factors from the ink.
1. Appearance
Ink appearance quality is excellent can affect the printing operation, and will affect the smoothness and coloring of the printed products.
2. Viscosity
Ink viscosity for printing suitability and the impact of the quality of the finished print is very large. Viscosity is too high, printing will occur sad ink, easy to blister, produce drawing and ink hard to dilute these phenomena, easy to affect the smoothness of the printing ink film, the surface is easy to produce reticulation; viscosity is too low, printing will occur leakage, pattern blur, lace, covering power to reduce the phenomenon.
3. Fineness
Refers to the ink pigment, filler and other solid powder in the degree of dispersion of the connecting material, also known as dispersion. Uneven size of the ink particles or too coarse, easy to produce plug, loss of plate, poor smoothness, unclear printing patterns and other phenomena.
4. Color concentration and hue
Each batch of ink hue and color intensity should be consistent. If the difference is large, the color of each printing presentation can not be maintained consistent; especially in the color mixing or color printing differences are more obvious. Therefore, the ink in production or before use must be strictly check the color and hue, if there are differences, can be modified in the color mixing formula, so that you can achieve the effect of consistent color.
5. Glossiness and matting
Ink is glossy or matte is based entirely on the finished printing effect needs of the printing. General glossy ink color is more bright and shiny, matte ink is more classical and has a three-dimensional sense.
6. Adhesion
Ink on the substrate adhesion ability is good with the substrate characteristics of quality and the ink itself and the nature and amount of solvent has a lot to do with. Substrate, the surface or internal surfactant (stabilizer, sand oil) and plasticizer, film release agent, lubricant, etc. will affect the adhesion of the ink; food packaging polyolefin film (PE, HDPE, PP, CPP, PET, etc.) surface needs to be oxidized or other treatment, the degree of treatment also has an impact on the adhesion of the ink; the ink itself and the composition of the ink thinner Ratio and thinner dosage should also be carefully considered.
7. Covering power
If you want to cover the dark substrate, you should choose the ink with high covering power. When printing, you should pay attention to the choice of printing method, and try to use a lower number of mesh printing method. In addition, when diluting the ink, pay attention to the amount of solvent and the corrosion of the solvent on the substrate.
8. Permeability
When the substrate contains plasticizer (DOP), such as soft PVC, encounter poor chemical resistance of the color (dye) material is easy to produce color penetration (migration) phenomenon. Therefore, in the choice of ink, pay attention to the choice of good color permeability, to prevent the finished printed color migration and scrap.
9. Fire flower
If the printed matter needs to be high-frequency processing, the ink selected must be able to prevent electrical conductivity, so as not to produce electric sparks to scorch the printed matter or damage the mold and equipment when high-frequency.
10. Adhesion and jointability
The characteristics of various plastic films have advantages and disadvantages. Therefore, the choice of film is based on its excellent characteristics, and then another film with its opposite characteristics to paste (laminated) together to achieve the perfect characteristics of the new composite film.
11. Chemical properties
This performance refers to the ink in acid, alkali, water, alcohol, soap, oil, freezing or other solvents, the color and performance does not change the ability, also known as the chemical resistance of the ink or resistance to resistance. The chemical resistance of the ink is strong, and the color and properties of the ink will not change under the action of acids, alkalis and other substances. The chemical resistance of the ink is determined by the type and performance of the pigment and linking material, and with the pigment and linking material combined with the state, and the stability of the ink.
12. Light resistance
General wallpaper, wall materials, building materials, floor tile materials, billboards, decorative materials and window ornaments packaging need to contact with the sun, if the light resistance is poor, within a few days the color will change or disappear, therefore, the printing of the above substrates are required to choose a good light resistance of the ink.
13. Environmental protection
After the printing of the product, because of its final product use range or industry is different, while different countries and regions on the requirements of environmental protection projects are not the same. Therefore, in the selection of a certain ink for printing, must understand the final printed products of each special environmental requirements.
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