The print head is an important part of the skycolor photo printing machine, and it is a part that directly completes the printing work. The high precision of the printer is well known. The printhead is extremely small, which is about the same as the small dust in the air. This is the important reason for the high printing accuracy of the printing machine. Of course, this feature also makes the printhead extremely easily blocked. There are many reasons for this phenomenon.

1.The most common is the blockage is caused by the ink on the printhead becoming dry. Ink is a volatile liquid that is volatile in the air and clears out solids. When the printhead is sprayed, some ink will always remain around it. After this part of ink is dried, the printhead will gradually become smaller or even block the printhead. This blockage can be solved by the cleaning function that comes with the printing machine.
2.Piezoelectric crystal is damaged: surely the printhead cannot eject ink,the general piezoelectric printhead can be used for about one year.
3.Piezoelectric crystal fatigue damage: the phenomenon is that the printhead sometimes eject ink and sometimes does not, especially when the inkjet volume is large (when spraying dark pictures), the phenomenon of "blocking" is obvious. The best way to do this is to replace the nozzle with a new one.
4.The filter inside the print head is clogged and the print head does not eject ink: use the print head for a long time, especially in the factory where is often shut down at night. The ink does not flow in the print head for a long time, and it is easy to be adsorbed on the internal filter or the wall of the ink channel. Making the cross-sectional area of the ink smaller will also cause the printhead to fail to eject ink. Now special equipment can help you solve this problem.
5.The viscosity of the ink is too high or too low: the viscosity of the ink is too high to make the ink poor in fluidity, and the amount of ink ejected by the print head per unit time is not enough; the viscosity of the ink is too low, it is easy to suck in air when the piezoelectric crystal is withdrawn, and it cannot absorb ink; both of them will cause the print head to not absorb ink. This often requires customers to store the ink in a suitable environment. It is better to put the ink in the working environment for more than 24 hours before use, because the viscosity of the ink at low temperature will be very high, but the opposite at high temperatures.The viscosity varies greatly. Once inks with large viscosity differences are mixed together, it will cause the phenomenon that the ink cannot be ejected.
6.Failure of the driving circuit: the aging of the electronic components of the driving circuit and the accumulation of too much dry ink dirt may affect the voltage of the driving head, causing the head to not print ink or the ink output amount to be unstable.
7.Types of ink: Due to improper control of the amount of desiccant, some manufacturers' inks dry too quickly, which may cause the ink to block outside. Although it can be cleaned, the cleaning interval is relatively frequent. Once the printhead is not used for a long time and the it is not protected in time. In some cases, the print head may be permanently damaged during the next painting.
8.Frequent ink changes: In many cases when the ink is replaced, the print head may not be protected, and the inkjet may be affected.
9.The temperature and humidity of the printer: Generally recommended temperature is 22 ~ 35℃, humidity 40 ~ 60%. High or low temperature affect the viscosity of the ink, which will cause ink shortage or paste phenomenon of the print head, which is often mistaken "printhead blockage."

The above are the main reasons that cause the printhead to be blocked. We can see that the ink cannot be replaced frequently; when the printer stops working, the printhead and the capping station must be fully sealed to prevent the print head from being blocked because the ink is dry. To maintain the constant temperature of the printer’s working environment, and the ink should also be placed at a constant temperature environment; the printer should be equipped with a voltage regulator to ensure the stability of the voltage to prevent damage to the print head; The machine must be grounded to prevent static electricity from interfering with the printhead.

1,Printhead need to calibrate. Re-align printhead horizontal and vertical,change ICC profile,upgrade software,increase feather value.
2,Check take up system and feeding system,if it have resistance,it will lead to movement speed and printing speed difference.
3,Carriage not be fixed tight.
4,Check if ink tube clogged,must guarantee printhead in good nozzle, ink tube don’t exist clog situation.
5,Material problem, including material and ink.

The cold air is coming round and round, the weather is getting colder and colder. In winter, the poor adhesion of the UV flatbed and roll to roll  printer's material pattern is a headache. No matter how good it is, there is no shelf life and practicality. So, in cold weather, what is the reason for the poor adhesion of the material, and how to solve this problem? EPS3200 head Skycolor UV manufacturer will give you a brief combing today.

Causes of poor material adhesion in winter
1. The humidity is too dry in winter, and the dust and dust are impetuous on the surface of the material. Makes it harder for inks and materials to stick to each other. It is also possible that the humidity is too high in winter, exceeding 70%, and water molecules are generated on the surface of the material, which isolates the ink from the material, which causes the surface to dry.
2. The weather is cold in winter. Due to the effects of thermal expansion and contraction, the molecular density between the materials to be printed becomes more compact, which causes the printed pattern to be prone to cracking and poor adhesion such as peeling.
3, If clients want Skycolor UV flatbed printer print a good product, its ink is the key, but indoor temperature and humidity are the biggest factors affecting the ink. In general: the higher the temperature, the faster the drying, and the lower the temperature, the slower the drying. The indoor temperature is low, the curing speed of the ink itself is slow, and the surface does not dry after the pattern is printed, resulting in the peeling of the printed image.
4.Batch issue of materials.
Solution
1. If the indoor ambient temperature is too low, install an air conditioner in the workshop to keep the indoor temperature below 15 ° C. If it is not possible to install an air conditioner indoors, the materials to be printed can be heated to a suitable temperature.
2. Avoid humid environment. When the humidity in the air exceeds 70%, the moisture will easily condense on the printed material, resulting in poor adhesion.
3. If the indoor environment is too dry, it may also cause the problem of poor adhesion of the printed patterns. In this case, you can consider installing a humidifier indoor to increase the indoor humidity.
4. If it is a batch problem, you can contact the material supplier to change the batch material test

UV glazing, UV ink is a solvent material, solvent content less than 5%, neither volatile, so almost pollution-free to the environment. In addition, UV glazing, UV ink film although not a short time degradation, return to nature, but completely cured UV glazing, UV ink toxin free. And the substrate can be recycled..During recovery, the film layer and substrate can be mechanically separated and broken to remove. Such as paper after UV light oil, the paper will be recycled to the paper mill beating, light film is broken into the bottom of the pool by the beating machine, and paper reuse, will not produce white pollution similar to mulching.
1.UV offset printing ink printing suitability and performance standards and ordinary offset printing ink is basically the same, otherwise cannot use the same offset press printing.But because UV inks are solvent - free inks, linker and ordinary solvent - based inks system, printing suitability and characteristics will not be exactly the same.
2.UV offset printing ink to adjust its viscosity can not be like ordinary offset printing ink with solvents to adjust, and with different levels of prepolymer first prepared very thick paste, and then add thinner monomer to adjust.
3.Offset press using UV ink to replace UV printing cots, PS version, rubber cloth. Because UV ink in the thinner monomer, photoinitiator, sensitizer, such as the material to promote aging and corrosion.The performance of the cots for a long time continuous use of swelling, cracking phenomenon, the performance of rubber blanket for the ink transfer rate has changed but also aging phenomenon. The PS version appears to cause the photosensitive layer to fall off quickly. The correct use of fountain solution to prevent UV ink wiredrawing is critical.
4.Different colors of the ink UV light transmittance is different, so the curing efficiency is different..For transmittance of the ink to adapt to when the addition of photoinitiator and other accelerated curing substances, UV wavelength such as 417nm wavelength UV light irradiation is also conducive to accelerated curing.Good light transmittance of the ink to add less photoinitiator, the purpose is to make multi-color UV ink to maintain the same curing rate, easy to install UV curing equipment..

1,Printhead 
Printhead is the essential core part,we must pay more attention on it. When head slightly clogged,our printer have cleaning function,use it is okay. When head heavily clogged,need to put head into cleaning liquid,
2,Guide line
The maintenance of guide line is a gradual process. At the first time turn on printer,use tissue or cloth wipe the dirt in guide line.
On daily use,with clean paper or towel dipped into alcohol to wipe guide line clean.
3,Encoder strip
Strip is an piece of transparent film,his function is to fix position. It will cause image dislocation problem if strip dirty. We suggest to clean strip regular. With clean water wipe it slightly,don’t use hard power,both sides need wipe.
4,Capping station
After skycolor printer worked long time,Wiper and cap will have some waste inks and dust.If it cleaned timely,it maybe cause head clog etc; So it need to use cotton bar with cleaning liquid to clean wiper and cap regularly. If wiper out of shape or damage,need to change new 

When using a Skycolor UV2513 printer, Skycolor 1.8m and 3.2m UV roll to roll printer with EPS3200 head to print certain materials, burrs, chaotic points, and blurred lines sometimes appear. This is caused by the "floating ink" of the nozzle device. At this time, the production operation of the equipment should be stopped, the origin of the equipment should be reset, and then the faults should be meticulously checked, and production should be resumed after all the faults are resolved! In response to these problems, today I compiled a few reasons and solutions for everyone's reference!

Cause one: Head clog
EPS3200-EPSON 4720 head at UV ´romter will cause the nozzle to be disconnected, so when the amount of ink sprayed in a certain color is insufficient during printing, it will appear as burrs, blurred lines, and fuzzy. At this time, you should carefully check the status of the print head, print a test strip, and if necessary, clean the passage of the print head to keep it open.
Cause two: The distance between the print head and the print material is too high
The distance between the print head and the printing material is too high, resulting in ink droplets not being able to be sprayed on the surface of the medium in a straight line. Usually, when the print head is more than 8cm away from the printing material, the phenomenon of "floating ink" will appear. Therefore, when printing, the height should be detected. If it exceeds, the distance from the material should be reduced.
Cause 3: The voltage of the print head is too high
If the print head voltage is too high, it will affect the operation of the printer. Because UV printer nozzles have stricter working voltage requirements, if the voltage is unstable or the voltage is too high, it will cause the equipment to malfunction. Check the voltage displayed by the indicator, whether it lights up red and alarm. If this happens, the voltage of the print head needs to be reduced. If it is a modified circuit board card, you need to change the circuit to solve it.
Cause four: printer electrical control system
The electrical control system controls the pulse interval of the nozzle to ignite unreasonably. If this happens, it needs to be resolved by a technician.
With the technological innovation and progress of the entire industry, the application range of UV printers is becoming wider and wider, and it is also recognized by more corporate structures. For example, the problem of flying ink in the UV printer during the printing process will cause great trouble to production efficiency. Once this problem occurs, the flying ink problem of the UV printer should be solved in time to bring higher efficiency to the production of the enterprise. Create value for users far beyond the device itself.