Because UV printing has a wide range of applications, when we read the forum, we found that many potential users have some questions, so it has been stagnant, and there are also people who want to cross fields or use objects with radians, but because some of the reference is not enough, or information barriers, resulting in some work can not be smoothly carried out, this will be according to the questions provided by users, to answer one by one.

1. UV ink problem

(1) What is UV protection ink?

UV protection ink refers to the use of UV light of different wavelengths and energy to polymerize the monomer in the ink connection material into a polymer, so that the ink film and dry ink.

The role of UV protection ink: Before passing the UV lamp machine, a layer of UV protection ink will be brushed on the glass substrate, and the protective ink will be cured under the irradiation of the UV lamp machine, and the protective ink will reduce the possibility of indentation and scratches in the subsequent finishing process of the glass substrate, so that the defect rate is almost 0. It can achieve zero VOC emissions and is a new low-cost UV protection ink.

UV protection ink industry pain points

High cost of use: The high cost of research and development of UV ink makes the price of UV ink higher than that of traditional ink, and because the use of UV ink needs to be equipped with a special UV roller and cleaning agent, the application cost is high, making UV ink expensive to use.

Poor protection performance: UV ink is easy to gelatinize and deteriorate, and most of the storage period can not exceed one year.

Low adhesion: During the curing process of UV ink, its internal components are cross-linked and polymerized, and the volume changes instantaneously, resulting in greater internal stress. At this time, it is difficult for UV light to penetrate the thicker paint containing pigments, which is easy to cause UV ink curing is not complete and the adhesion is poor.

SUBLISTAR UV ink curing fast drying, ink adhesion 4B, high surface hardness, good wear resistance, alkali film fast, no residue on the glass surface. After printing, the surface is flat, no shrinking oil, no bubbles, low odor, no pungent taste. Easy for customers to use. Mainly used in mobile phones, car, watches and other high-end electronic products glass protective screen CNC processing anti-scratch protection ink.

(2) Why is the second curing effect of UV ink not superimposed after curing?

There are peer novice test questions: recently in the UV ink curing. For example, after a UV ink is made into a film, the curing energy needs 5000mj, but I need to give enough at one time, not 2500mj first, and then 2500mj, so that the cured surface is wrinkled, but once enough 5000mj curing is a flat film surface, may I ask why?

First of all, it cannot be imagined in mathematical terms: how much energy is not decayed enough, the corresponding percentage is solidified.

Second, the curing of UV ink is an irreversible reaction. UV ink Under ultraviolet light, monomers in the ink will cross-link to form polymers that are insoluble in water.

The second curing can only reinforce the already cured ink, and cannot superimpose new colors or patterns. The curing layer of UV ink is dense. When UV ink cures, it forms a dense polymer layer. This layer blocks the penetration of ultraviolet light, so the second curing can only strengthen the polymer layer, but not the underlying ink.

UV inks cure faster. UV ink can cure quickly under ultraviolet light. Therefore, if the second curing time is too short, it will lead to the upper layer of ink too late to cure, curing is not complete, the ink will certainly spread in the surrounding, intuitive Yin and Yang color and other color differences such problems will appear, thus affecting the overall printing effect.

2.UV application problems

(1) Successful cases of UV printing car identification

Everyone who drives knows that the 3C logo is printed on the glass of the car, but how this logo is printed is not known. The logo is printed with UV ink. The use of UV ink printing can reduce the pollution caused by the original use of mercury lamps, and mercury lamps have large power consumption and high tube replacement frequency. In contrast, UV LED equipment will have a higher cost performance.

UV LED curing equipment workflow: according to the customer’s wiring and process requirements, prepare UV LED curing printer to start testing. After a series of adjustments, the test finally found the best light intensity and curing time. According to customer requirements, the printing ink on the conveyor belt is cured, and the cured glass should be milling once into the production line, through the milling glass production line, to ensure that the logo is not fuzzy and does not fall off.

This is already a mature technology, the equipment required is larger, the general small line UV printer can not meet.

(2) Want to know how to print the key cap pattern?

The customer wants to do the key cap, but do not know what process, the business said UV printing, but some people said sublimation printing, so he does not know how to choose.

At present, both UV printing technology and sublimation printing technology can support printing key caps. It should be noted that due to the curvature of the keyboard cap itself, it is uneven. When choosing the UV printer nozzle, it is necessary to choose the industrial nozzle with strong jet force, the ordinary civilian nozzle can not meet this requirement, there will be flying ink and scratching the nozzle phenomenon. As for printing patterns on it, this is very simple: 1. Edit and draw patterns in color management software; 2, import to the device print control software; 3, the key cap raw materials are placed on the platform, start printing.

The printing effect of the UV printer has good gloss and adhesion, so that the pattern image has the same fine degree as the flat printing on the concave and convex surface and the inclined surface. Can be a good display of the details of the key cap and the gradual color level, this process in today’s largely rely on UV printing equipment to achieve, the traditional screen printing transfer is not directly on the finished keyboard color spray, at the same time UV color printing process can be used in the computer periphery (chassis, PCB circuit board, mouse) and other logo pattern personalized customization, color spray. UV printing can better reflect the flexibility of custom patterns and the advantages of plateless printing.

(3) Can the UV flatbed printer print curved materials?

UV flatbed printers can print curved materials, as for the height of the surface of the curved material, do not exceed 9 mm (most of the market support is 8 mm). If the arc is higher than the spray force range of the nozzle, it is easy to appear the phenomenon of flying ink.

Conventional UV printers are flat panel printers, mainly print flat classes, or advertising large format accuracy requirements are not so high. Our common gift packaging, plastic, electronic shell packaging, crafts, toys and other products with curved and convex surface printing, is a UV machine and ink have certain requirements:

① Appropriate equipment: for arc printing, the corresponding fixture is needed. UV printing equipment to ensure that ink can be uniformly deposited on the curved surface.

② Adjustment and alignment: for curved printing, the correct adjustment and alignment is very important to ensure that the image or text is accurate in the printing position of the curved surface without deformation and does not affect the overall accuracy.

(3) Curved surface and convex shape: curved surface may have convex, convex and other characteristics, which may affect the quality and accuracy of printing. Through the adjustment of UV printer nozzle and waveform, the drop printing of 10~25mm can be achieved. When doing UV printing, it is best to talk to a professional printing service provider or equipment manufacturer to understand the capabilities of their equipment and technology and whether it can meet your specific needs. They can provide more detailed advice and solutions based on your needs.

The above is to answer some special questions, enrich the vast number of novice users of the operational knowledge reserve, later will update more about UV printing related knowledge, welcome to pay attention to us.