Analysis of Influencing Factors of UV Printing Quality

(B) UV ink characteristics:

The characteristics of UV inks generally summed up in the following 12 points:

1. No need to spray powder

2. Immediately dry, but need to use ultraviolet light to dry

3. No UV light does not crust, so it does not crust in the ink tank

4. Ink does not contain solvents

5. Printable non-absorbent printed material

6. Ink film is uniform and has better friction resistance

7. It will not dry on the printer or on the plate before it is irradiated.

8. It will change under high temperature and high humidity and should be kept below 20°C

9. Cannot be mixed with general ink

10. Thinners and cleaning agents must be used exclusively by UV. Inkers and blankets must also be used exclusively or concurrently.

11. UV inks are not universal for all materials and their adhesion depends on the nature of the ink

12.UV is a chemical line. The wavelength required for ink drying must be close to the UV wavelength, otherwise the drying effect cannot be achieved.

Figure 2 UV ink drying schematic

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Fifth, UV printing

(I) Factors affecting the drying of UV inks

The length of UV ink drying time is generally affected by the following factors:

1.UV ink thickness

2. Different types of printed materials

3. The speed of the machine

4.UV reflector type

5.UV lamp strength



(b) Materials commonly used in UV printing

The materials used for UV printing are usually non-absorbent materials. In addition to paper, plastic materials and metals are commonly used. In this article, only plastic materials are introduced.

The nature of plastics is mainly determined by the size and shape of its constituent molecules. Most plastics are monolithic in the first few stages of manufacture, that is, they consist of small units of molecules, but they function in heat, pressure, and chemical catalysts. Next, these small molecules combine into complex molecules and become solid or semi-solid structures. The plastic properties can be listed as follows:

1. Resistant to chemical attack

2. Glossy, partially transparent or translucent

3. Most plastics are good insulators

4. Lightweight, but strong, and can even replace metal

5. Large-scale production, easy processing, and low price

6. Widely used, effective and colorful

7. Physical stability, good electrical properties

8. Flexible, easy to color, some high temperature

(to be continued)

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