How to solve the problem of ink diffusion in PET matte silver paper printing?

In PET matte silver paper printing, solving the problem of ink diffusion is an important process link, which directly affects the quality and appearance of the printed matter. Here are some ways to solve the ink diffusion problem:

First, choose the right ink

1.Ink Type:

UV ink: UV ink has the characteristics of fast drying, high hardness, good wear resistance, etc., suitable for PET materials. UV ink is rapidly cured under ultraviolet irradiation, which can effectively reduce the flow and diffusion of ink in the printing process.

Solvent-based inks: If you choose solvent-based inks, you need to ensure that their drying speed is moderate and that they have good adhesion to the surface of PET matte silver paper.

2.Ink viscosity: Adjusting the viscosity of the ink is the key to controlling ink diffusion. Too high viscosity may lead to ink transfer difficulties, while too low viscosity is easy to cause ink diffusion. Therefore, it is necessary to precisely adjust the ink viscosity to the best range according to the characteristics of the printing equipment and PET matte silver paper.

Second, optimize the printing process

1.Control the printing pressure: too much printing pressure will cause the ink to be over-squeezed and spread. Therefore, it is necessary to adjust the pressure setting of the printing press to ensure that the pressure between the ink scraper and the screen is moderate, which can ensure the uniform transfer of ink and avoid ink diffusion.

2.Adjust the printing Angle and speed: the printing Angle and speed also have a certain impact on the diffusion of ink. By optimizing the scraping Angle and speed, the shear force and impact force of the ink during the printing process can be reduced, thereby reducing the risk of ink diffusion.

3.Use the appropriate screen plate: the mesh and opening rate of the screen plate should be selected according to the fine degree of the printing pattern and the viscosity of the ink. The screen plate with too high mesh number or too small opening rate is easy to lead to ink blockage and diffusion; The screen plate with too low mesh number or too large opening rate may not meet the requirements of fine printing.

Third, strengthen post-processing

1.Curing treatment: After printing is completed, curing PET matte silver paper in time, such as UV curing or thermal curing, can accelerate the drying and curing process of the ink, improve the hardness and wear resistance of the ink, thus reducing the possibility of ink diffusion.

2.Cleaning and maintenance: Regular cleaning and maintenance of printing equipment and screen plate to ensure that the equipment is in good condition to reduce ink diffusion caused by equipment problems.

Fourth, pay attention to environmental factors

1.Temperature and humidity: the temperature and humidity of the printing shop have a certain impact on the drying speed and fluidity of the ink. It is necessary to keep the workshop temperature and humidity stable to avoid ink diffusion problems caused by environmental factors.

In summary, to solve the ink diffusion problem in PET matte silver paper printing, it is necessary to select the right ink, optimize the printing process, strengthen the post-treatment and pay attention to environmental factors. Through comprehensive policies, the quality and appearance of printed matter can be effectively improved.