How to improve ink adhesion during uv printing?

If you want to judge whether the effect of a UV printing equipment is good or not, in addition to the performance of precision and color effects, you should also pay attention to the performance of the printed product such as friction resistance, bending resistance, high temperature resistance, and water bath resistance. Whether the focus is good or not also directly affects the practical application of printed products.

If there is a problem of weak adhesion during uv printing, how can we improve it?

Pay attention to environmental impacts        

Humidity is too high: When the humidity of the uv flatbed printer's working environment is too high, moisture may remain on the substrate itself or on the surface. In this case, UV ink printing is not easy to dry completely, which affects the quality of printing.

The temperature is too low: When the working environment temperature of the uv flatbed printer is too low, it will affect the smoothness of the UV ink. The viscous ink is easy to cause problems such as drifting ink, unclear printing, and wrong colors, and may also cause cracking and peeling and so on.

Therefore, avoid storing consumables and operating equipment in too harsh an environment, and dehumidify or dry properly according to the climate, so that the indoor air humidity can be maintained between 30% and 70%; the indoor temperature should be kept between 20°C and 30°C as much as possible , to reduce the impact of environmental factors on the printing effect.

Pay attention to the UV lamp curing thoroughly        

Different inks may have different curing characteristics. If the ultraviolet wavelength of the UV lamp does not match the performance requirements of the ink curing, or if the power of the LED lamp is too low during the printing process, the UV ink will not be cured on the surface of the material. A thorough phenomenon whereby the adhesion of the pattern becomes poor.

You can try to increase the power of the uv lamp or replace it with a higher power uv lamp to solve the problem of adhesion.

Clean the surface of the substrate before use        

When substances such as grease, adhesives, and dust are attached to the surface of the substrate, it will cause poor bonding between the UV ink and the substrate. Insufficient surface treatment of plastic products before printing will also cause failure of ink fixation.

Before UV printing, the printing material can be inspected, decontaminated and degreased, etc., to increase the adhesion.

Use primer        

Substrates with a smooth surface and insufficient adhesion will also have weak ink during UV printing. You can add a primer on the surface of the material, and use the corresponding primer for different materials to effectively improve the printing effect.

Use suitable uv ink        

UV printers are generally equipped with special inks, which are divided into soft inks, hard inks, and neutral inks. Different materials use different inks. The quality of inks on the market is uneven. The cheaper the ink, the worse its quality, compatibility, and adhesion, and the greater the chance of nozzle blockage and damage.

Try to use the ink configured by the device, which can largely ensure the quality of the ink and make it easier to ensure the printing effect.

Flame, corona or other special treatment        

In order to improve the adhesion performance with the ink, some printing materials must be treated with flame on the surface. If it is a metal material, it must be degreased and dust-removed before printing. After printing, it should be dried according to the temperature required by the ink. If drying Improper handling can also cause ink film peeling failures. In addition, in order to make textiles waterproof in textile printing, silicon processing is generally required, so that poor ink adhesion is not easy to occur during printing.