How to solve the UV ink adhesion force problem and improve waterproof performance?

UV printer suit for printing any media, but for different media with different UV ink adhesion force. For example, wooden and leather adhesion force is very good, so the printing result is hard to peel off. But, printing on some high density material, such as glass, crystal, metal and tile etc. Those materials adhesion force is not good as wooden and leather.

User can to improve printing adhesion by pre treatment and after treatment. For example, make a layer of coating on material firstly. Coating is helpful for strengthen the adhesion of color. Go through per coating, printing result will have a better color adhesion. Another way is that add a layer of varnish on printing products to avoid external environment’s effect on printing result. There are still some other methods to strengthen the adhesion of , such as adopts double sides glass, put pictures in the middle of glass. Then the picture will never flake

Besides of the problem of color adhesion, for user, printing products non waterproof is also a big problem. The best way to solve this problem is that after UV printing, then printing a layer of professional UV Varnish on printing products. UV Varnish  not only help for strengthening the color adhesion but also good for improve printing products waterproof performance. Even if products touch with water, printing color is hard to flake.

Shanghai Meitu Digital Industry Co.,ltd can solve all of problem for UV printer to users. We will offer professional technical support and kindly after-sales service to you. Our quality and service will let you select printer without any worries. Welcome customers come to visit our company for checking printing quality, we can offer printing sample for free.

How to select the coating for UV printer

For UV flatbed printer, the main function of coating is that absorbs ink

to form image and increase the adhesion of image. In short, if you want to printing full color on ABS plastic material. Due to ABS is large densities material, it is very difficult to adsorb the ink, even if use UV ink. So, firstly user need to make a layer of ABS coating on ABS plastic material, then printing on it. You will get a clear printing result, it will never rub off.

Then, whether UV flatbed use same way to print all kinds of materials? The answer is no. However, if ignore adhesive force, UV printer can be used to all type of material. For UV printer, different material needs different coating. Such as, ABS material will need to make special ABS coating treatment. Metal media needs it’s own coating treatment also. So, the technology of coating treatment is complicated. This reflects a company's technical strength. For a company, it is difficult to have all type of coating.

Some tips for coating treatment:

Before printing, need to clean media’s surface and make sure it’s clean on surface. It is hard to have a dust-free working environment. So, before printing, we can sprinkle some water to reduce the dust in the air. Secondly, user should use dust cloth to wipe printing media. Professional dust cloth is soft and has stronger adsorbability and cleaning ability. After finish those process, the surface of media will be very cleanly.

  Why our flatbed printer also called UV flatbed printer?

Our flatbed printer also called UV flatbed printer. Obviously, UV printer adopts UV lamp to drying UV ink. UV printer adopts ink jet printing technology, during printing, print head don’t touch media. Let me introduce UV lamp now:

Power of UV lamp:

1.     UV lamp’s power just radiation energy, it is also called penetration. Firstly, it must need to meet the requirements of the Absorbed wavelengths and power density of UV ink. If UV power is not enough, even the time of UV lamp light is longer , no matter how many times the media has passed the UV lamp, The printings can’t be complete solidify. On the contrary, it will be cracked on the surface of UV ink. Besides UV ink will be brittle and has a poor adhesion. That will cause the adhesion in different color layers is poor. Because lower powered UV lamp can’t penetrate bottom of ink. So the bottom of ink will be lack of curing.

2.     Common power of UV ink is 80～160W/cm. More power will bring more heating also. Therefore, For different printing products, how to cool is very important for manufacturers.

3.     The best useful life for UV lamp is 8000-10000 hour. User need to change a new lamp after use 8000-10000 hour. Because the ultraviolet ray of UV lamp become very weak, it reduce curing effect. Meanwhile, during the working time of UV lamp, depends on different working environment(dust content of air), we suggest users use Absolute ethyl alcohol to wipe the lamp tube and reflector, then turning the lamp tube 90 degrees. It will help UV radiated into UV ink or varnish completely. To ensure sufficient penetrating power.

UV Printer adopts automatic printing. Both printing process and curing process happen instantaneously. During the working process, UV printer can finish the printing without human.

What is Multifunctional Printer?

Multifunctional Printer is referenced to traditional printer. Multifunctional Printer solves the bottleneck problem of common printer, printing will not limited by material. Whatever it is color block image, full-color image or gradient image. Multifunctional Printer can finish printing work at one time. No need plate making, No need plate burning, No need repeat chromatography. Multifunctional Printer is widely used in many fields. It can replace traditional printer completely.

Multifunctional Printer will not limited by material, it can printing on wood, glass, crystal, PVC, ABS, metal, plastic, stone, fabric materials and so on. Multifunctional Printer adopts piezoelectric printing technology, print head will not touch printing media directly, then use LED lamp to curing the ink. After printing, the ink will be solidified.

The performance of Multifunctional Printer is much better than other printers. It has advantages on printing resolution, printing speed. So Multifunctional Printer is very popular among users.

How to judge the UV ink has been cured by UV lamp completely?

How to judge the UV ink has been cured by UV lamp completely? There are four main methods. Sometimes, the ink surface look like has been cured already. Actually not. Then, how to judge the ink has been cured already? User need to take some professional methods.

1.     Pencil hardness test: Testing by pencil hardness-testing device, if the testing result can meet requirement(3-4h) that’s mean the ink has been cured already. Otherwise, You need to check the power of UV lamp and the speed of UV printer’s belt.

2.     solution test: Drop Propionic Acid Solution on the surface of ink. Two minutes later, if UV ink has some changes, this proves that the UV ink have not been cured completely. If the UV ink has been cured already, internal molecule structure will change into double bond. Then curing will be finished. The surface of UV ink will have a layer of strong coating.

3.     Pressure test: Put a little of cotton fiber on the surface of products, then add 500g flat weight on it. A few minutes later, take the weight away, if the cotton fiber not adhere on the products, that’s mean the UV ink has been cured already. Otherwise, it is not be cured.

4.     Appearance of UV ink: The surface of cured UV ink is very smooth but not irregular. The edge of products not have shadow. Printing effect is perfect.

We can better judge whether the UV ink has been cured by above methods. Shanghai Meitu Digital Industry Co.,ltd will continue to update relevant knowledge. Look forward to your attention.

Edit by Carol