Uv ink curing principle and advantages

The main components of the UV ink include organic pigments, photopolymerizable prepolymers, photosensitive monomers, and photopolymerization initiators. UV ink solves the problem of drying in printing with its unique drying method. Its drying principle is to cause the photochemical reaction of the ink by the radiation of ultraviolet rays to the ink, so as to achieve the purpose of ink curing. UV inks have the following two main chemical reactions in the drying process.

1. Photochemical reaction: The photopolymerization initiator contained in the ink undergoes photochemical reaction under ultraviolet radiation to generate free radicals.

2. Chain reaction: Generates free radicals with the ability to initiate chain reaction through photochemical reaction. Chains of unsaturated multi-functional prepolymer, multi-functional prepolymer, multi-functional crosslinking agent and reactive diluent in ink The reaction, cross-linked to produce a three-dimensional structure of the photo-cured product - dry ink film.

Therefore, the drying of the UV ink is mainly determined by the photocuring drying characteristics of the ink, so that the ink has different drying performance under light and light-free conditions, that is, the ink does not receive light when printing, and the rheological properties are maintained stably. Printed state; printed by UV radiation, rapid drying, to meet the post-press process operations, greatly improving the production efficiency, and greatly improved the ink drying adaptability.

1. Volatile Organics: Most UV products contain little or no organic solvents, no solvents will attack the printed matter, and do not pollute the human body and the environment.

2. Suitable for non-paper substrates: Can be printed on common substrates, and can also be printed on non-absorbent materials such as film, synthetic paper, metal or plastic.

3. Suitable for instant printing treatment: It can be quickly cured after irradiation with ultraviolet light.

4. Use less ink: Because UV ink does not contain solvent, it only needs 1/3 to 1/2 of the amount of ink used to achieve the desired effect.

5. Strong color matching: Adjust the viscosity, hue and lightness of the ink, then you can produce rich colors. If you mix two or more basic colors, you can get a variety of colors.

6. Opacity is easy to control: pigments or pigments can be added in the extension base to achieve the desired brightness according to the standard ratio.

7. UV ink under certain printing conditions can be used for ice, refraction, sanding, wrinkles and other special effects.