Classification and necessary conditions of the hot

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Classification and necessary conditions of plastic silk printing inks

1. Classification of plastic silk printing inks

(1) classification by substrate

classification by substrate chemical name can be divided into: polyethylene, polypropylene (non-polar) inks. PVC, polystyrene, ABS polycarbonate (polar) ink. According to the form of the substrate, it can be divided into soft plastic ink and hard plastic ink

(2) classified by drying method

there are volatile drying ink, UV curing ink and oxidation drying ink

① volatile dry ink: it is the most used ink in silk printing. The ink film is mainly composed of macromolecular substances. After printing, the solvent volatilizes, and its macromolecular substances form the ink film. This evaporation drying process is reversible, that is, the drying ink film can be re dissolved with solvent

after the ink is transferred to the substrate, there will be solvent ink film, and the solvent volatilizes first. The solvent in the ink diffuses in the atmosphere due to the action of vapor pressure, forms a liquid film on the surface of the ink film, and then volatilizes through the liquid film. In this drying process, the internal drying is generally slow, and sometimes the drying needs to be accelerated by blowing

volatile inks are widely used because they are easy to use and generally dry faster

② UV curable ink (UV ink): UV ink can produce photochemical reaction, and can be completely cured in a few seconds. It is used more and more in plastic printing. The main components of inks are photopolymer resins, initiators, pigments and additives. In principle, organic solvents will not be used

③ oxidation drying ink: the ink contains polymers with small molecular weight, which are oxidized in the air for nearly two years, and form a polymer film through the chemical reaction of heat, light or reactive substances. This kind of ink usually needs to be heated to promote hardening after it is printed on the surface of the substrate

2. Conditions that must be met by plastic wire printing ink

① the ink should not dry the conjunctiva on the printing plate, and when printed on the surface of the substrate, it is required to be fast fixed and dry, and have good adhesion fastness

② the ink should be loose, short, thin and slippery to ensure that the ink is easy to be coated evenly on the printing plate. It is easy to pass under the condition of small force. It is required that the printed image and text should be clear and free from dirt

③ when the ink is coated on the printing plate, the viscosity, viscosity and consistency of the ink should be stable to ensure the consistency of print quality and the smooth progress of printing

④ after printing, the ink on the printing plate should be easy to clean to ensure that the printing plate can be reused

microcomputer hydraulic servo universal experimental machine is an advanced material experimental machine ⑤ it is necessary to ensure that the printing has a certain color concentration. For color patterns, ensure that they have normal tones

3. The main components of plastic wire printing ink

(1) pigments

include pigments and dyes. In addition to the color rendering function, pigments also make the ink have hiding power. In addition, it also affects the light resistance, heat resistance, solvent resistance and drug resistance of the ink

(2) the rise and fall of the national billet market on the 29th showed that binder

binder is a fluid component of ink. It plays a connecting role, so that solid substances such as pigments and fillers are dispersed in it, which is conducive to the uniform transfer of ink during printing. Another important function of it is to make the ink dry, fix and form a film on the surface of the substrate

binders are the key factors that determine the performance of inks. Different types of inks usually choose binders with different properties, especially in the automotive industry. Binder includes resin, grease, solvent, etc

(3) additives

additives are various auxiliary agents added to improve the printability of inks, mainly including defoamers, thinners, plasticizers, UV absorbers, drying regulators, etc. When printing, you usually only need to add

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