Exploring the difference analysis of UV printing quality(part2)
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In addition to discussing inks, this paper also discusses the relationship between printing presses and dryers to find out the best quality evaluation of the printing process.
Third, the aspect of drying
Since UV drying equipment is expensive and its loss rate is fast, it analyzes the equipment in its drying process.
[1] Advantages and disadvantages of UV drying
1. Reduce air pollution: Because UV can be dried, the material does not contain 100% solid matter, so there is no pollution.
2. Space saving: UV drying device is simple and safe, can be dried in short time and normal temperature, so the manufacturing cost is lower than the traditional hot air stove.
3. Saving manpower: Because the process is simple, so save manpower and increase productivity and power saving costs, because drying takes only a few seconds, so save electricity costs about 60%. 4, improve quality: improve the quality and accuracy of the dried material, and has physical resistance, chemical resistance, non-toxicity, especially in food packaging and toy printing. A special effect called fabricization and matt is also obtained by UV drying.
[2] UV discharge tube
1. Emission intensity The relationship between the UV emission intensity and the type of light source, the UV light field, the color and the number of lamps on the drying, and the ink adhesion and drying rate are closely related.
2. Lamp life such as type, wattage, number of uses and time, instant start, cooling, installation position, proper use and maintenance.
[3] The radiator consists of a reflector, a lamp holder, a cooling system and an exhaust system.
1. The reflector
A, wide shot [flat shape and astigmatism]
B. Concentrating shape: Improve drying efficiency, avoid waste of light source and harm the human body.
2. The lamp end fixing seat UV lamp tube normally emits its temperature of more than eight hundred degrees, so it must be resistant to high temperature and good insulation of the ceramic holder.
3. The cooling system The main effect is to cool down, in the UV irradiation are high temperature state, do not give normal cooling, the lamp, radiator, line overheating and short circuit.
4. Exhaust system, shielding and safety device The exhaust system mainly makes the operating environment free from heat and odor. UV light can cause skin and eye damage, so it is shielded to prevent UV light, and safety reasons plus a shutter device or reflector to turn the device up.
Fourth, the evaluation of UV printing quality differences
In the UV printing, what kind of printing is the most appropriate quality performance, so the price evaluation list is used. Analyze for UV screen printing and traditional thermoset rotary printing. As the cost and quality level can be known from Table 1, the quality and cost are equal to each other in the overall relationship. Therefore, 45% of the considerations are used as the analysis proportion of the evaluation.
[1] Quality
1. Resolution: The relationship between the mesh specifications of the screen version, so that the resolution of screen printing is poor.
2. Ink color: UV ink is worse than traditional ink [thermostatic].
3. Gloss: UV ink is better than thermosetting ink.
4. Abrasion resistance: The ink film formed after UV ink drying is stronger than the thermosetting ink.
5. Hardness: UV ink is better than thermosetting ink.
6. Drying temperature: UV ink without heat-solid paper shrinks due to heat. The phenomenon of waves occurs.
[2] Cost
1. Space cost: The space occupied by thermosetting ink is large.
2. Equipment cost: The thermosetting aspect is higher than the UV price.
3. Ink cost: UV price is greater than thermosetting ink.
4. Ink inventory: UV requires less pigment to get rich colors.
5. Energy consumption: The energy used by UV is probably one-half of heat solid.
6. Maintenance, consumables costs: the material used in UV wear rate is high, so that the cost increases.
[3] Other
1. Production
2. Environmental issues
3. Operational and safety
[4] Evaluation results It can be seen from Table 1 that UV printing is better, as long as the research is developed for its lack.
Fifth, the future trend of printing
With the rapid development of science and technology, coupled with environmental awareness, UV printing is imperative. Therefore, it is necessary to improve the progress of future UV printing and discuss it.
[1] Ink price: The ink price is about 3 times compared with the traditional one, and the ink depends on imports. Ink printers in the island should actively develop UV inks.
[2] Equipment price: The UV drying equipment itself is very expensive, and the vulnerable materials such as lamps, blankets, etc. So in addition to the development of new dryers, we also find alternatives to vulnerable materials.