Reasons and solutions for the use of photo-powder in the printing process

In the printing process, we will often encounter the phenomenon of paste. According to the manufacturer of the light-changing powder, the paste is the expansion of the dark-densed dots of the layout, which merges with each other, so that the level of the dark tone is gone, and it is formed on the printed matter. The fuzzy imprints have severely formed dirty spots, and the main reasons for the production of pastes are as follows.

Photo-powder powder manufacturer analyzes paste problem one: the ink supply is too large and the printing adaptability of the ink is not strong

1 The amount of ink supply is too large, causing the ink layer accumulated on the layout to be too thick. Under the action of printing pressure, the image dot spreads, and the lines are thick and without corners, thus causing paste.

2 The ink is too thin and the fluidity is large, causing the spread of the dots to cause a paste.

3 Excessive dry oil in the ink will make the ink emulsified, so that the ink layer on the printing plate can not be broken from the middle, and most of the ink remains on the printing plate, causing the ink to be piled up. Under the action of the pressing force of the roller, the dot is gradually enlarged. It causes a paste, and the excess desiccant enhances the viscosity of the ink, and the adhesion to the blank portion is enhanced, which easily causes the dark portion of the printed matter to cause a paste.

4 In daily work, we use varnish or excessive de-adhesive agent, which will increase the oiliness of the ink. During the printing process, the boundary between the dots of the graphic and text will be blurred and cause the paste.

  Solution:

According to the graphic elements of the printed product, properly control the amount of ink supply, control the amount of dry oil, varnish and degreaser. When using oil with strong oil, increase the acidity of the dampening solution.

Photo-powder powder manufacturer analyzes paste problem 2: paste caused by insufficient water supply

Because the pressure between the water roller and the plate cylinder is too small; the surface of the water roller is dirty; the water roller is used for a long time and the fluff loses its elasticity; when printing, the corresponding water roller sleeve wears on the printing plate. The relative gravity is relatively serious, the water absorption of the place is relatively poor, and the water supply is insufficient due to some reasons, and the ink and water balance is lost during the printing process, resulting in a paste.

The above-mentioned optical powder manufacturers have sorted out the two types of problems of printing paste and proposed solutions. In the future printing, we need to pay attention to these details. For the commonly used machinery, it should be cleaned regularly, not because of your own negligence. It has caused print quality problems, which will cause great losses.