How to control the ink layer thickness in the printing of BOPP synthetic paper?

In the printing of BOPP synthetic paper, controlling the thickness of the ink layer is a key step, which directly affects the quality and visual effect of the print. Here are some ways to control the thickness of the ink layer:

1. Choose the right printing method

Different printing methods will produce different ink thickness. For example, the ink layer thickness of lithography is generally about 12μm, the ink layer thickness of letterpress printing is about 25μm, and the ink layer thickness of gravure printing can reach 10μm or even higher. Therefore, when selecting the printing method, it is necessary to choose the appropriate printing method according to the needs of the product and the expected effect.

2. Adjust the parameters of the printing press

In the printing process, the ink layer thickness can be controlled by adjusting the parameters of the press. For example, parameters such as the pressure of the roller, the rotational speed, and the amount of ink supplied by the ink hopper can be adjusted to achieve the desired ink layer thickness. The adjustment of these parameters needs to be carried out according to the specific press and printing materials, and usually requires multiple tests and debugging to get the best results.

3. Use a precise ink scraper or ink scraper

In the process of spot color matching, in order to test whether the color of a certain color can achieve the desired effect, it is necessary to make a certain ink layer thickness of the color strip. In this case, the ink layer thickness can be controlled using a precise ink scraper or ink scraper. These tools can more precisely control the amount of scraping ink, resulting in a uniform ink layer thickness. This method is very useful in printing color matching and quality control.

4. Control the viscosity and fluidity of ink

The viscosity and fluidity of ink have a direct effect on the thickness of ink layer. The ink with higher viscosity is not easy to flow during printing, and the ink layer formed is thicker; The ink with lower viscosity is easy to flow, forming a thinner ink layer. Therefore, the viscosity and fluidity of the ink can be controlled by adjusting the formula of the ink or adding diluents to achieve the ideal ink layer thickness. However, it should be noted that the viscosity and fluidity of the ink should match the speed and pressure of the printing press, otherwise it may affect the printing effect.

5. Maintain and check the printing equipment regularly

The state of the printing equipment also has a certain influence on the control of the ink layer thickness. If the ink roller, plate and other parts of the printing machine are seriously worn or improperly adjusted, it may lead to uneven ink thickness. Therefore, it is necessary to regularly maintain and check the printing equipment to ensure that the components are in good condition. At the same time, it is also necessary to carry out sampling inspection of printed matter to find and correct the problem of uneven ink layer thickness in time.

6. Pay attention to the printing environment and operating specifications

The printing environment and operating specifications will also have a certain impact on the thickness of the ink layer. For example, the temperature and humidity of the printing shop, the operational proficiency of the printer, etc., may affect the uniformity and thickness of the ink layer. Therefore, it is necessary to keep the temperature and humidity of the printing shop stable, and train and guide the printing workers to ensure that they carry out printing operations in accordance with the operating specifications.

To sum up, controlling the thickness of the ink layer in the printing of BOPP synthetic paper needs to start from many aspects, including selecting the appropriate printing method, adjusting the parameters of the printing press, using an accurate ink scraper or ink scraper, controlling the viscosity and fluidity of the ink, regular maintenance and inspection of the printing equipment, and paying attention to the printing environment and operating specifications. Through the comprehensive application of these methods, the ink layer thickness can be effectively controlled, and the quality and visual effect of printed matter can be improved.