How to control the printing pressure when printing on BOPP color synthetic paper?

Controlling printing pressure is a key step in ensuring printing quality when printing on BOPP color synthetic paper. Here are some methods and suggestions for controlling printing pressure:

1、 Understand the role of printing pressure

Printing pressure can deform the rough and micro pores on the surface of paper (here BOPP color synthetic paper), rubber blanket, and printing plate under pressure, achieving reliable and complete contact, overcoming surface roughness and unevenness, and achieving effective transfer of ink and wetting liquid. At the same time, printing pressure also helps to enhance the adsorption force of ink, making it exceed the attraction between ink molecules, so that when the contact distance is close, the ink can break from the middle and be transferred. In addition, printing pressure can also promote the penetration of ink onto the paper by the connecting material after printing.

2、 Methods for adjusting printing pressure

Adjust the thickness of the pad:

Reduce the thickness of the padding under the blanket cylinder: By reducing the padding under the blanket cylinder, printing pressure can be increased, allowing ink to be more effectively transferred to the substrate (BOPP color synthetic paper).

Increase the thickness of the liner under the plate cylinder: If you need to reduce the printing pressure, you can achieve this by increasing the thickness of the liner under the plate cylinder.

Adjust center distance:

For slight differences in printing pressure, fine adjustments can be made by adjusting the center distance of the printing machine.

3、 Precautions

Adjust appropriately according to the specific requirements of the printed material and the characteristics of the substrate:

Different printed materials and substrates may have different requirements for printing pressure. Therefore, when adjusting the printing pressure, it is necessary to make flexible adjustments according to the actual situation.

Regularly inspect and maintain various components of the printing machine:

Ensure the stability and uniformity of pressure during the printing process to ensure high-quality output of printed materials. This includes checking the wear and cleanliness of components such as rubber cylinders, plate cylinders, and liners.

Cultivate professional technical personnel:

Printing companies should cultivate professional technical personnel so that they can flexibly adjust printing pressure according to actual situations and solve possible printing problems. These technicians should have rich printing experience and professional knowledge, and be able to accurately determine the size and adjustment direction of printing pressure.

In summary, controlling the printing pressure of BOPP color synthetic paper requires comprehensive consideration of multiple factors, including the role of printing pressure, adjustment methods, and precautions. By scientifically and reasonably adjusting and controlling, high-quality output of printed materials can be ensured.