Gravure Printing and Dragging

Drag and drop is a gradual change from a certain part of the image and gradually disappears. It is shaped like an animal and is often called trailing. The affixed version is different, it is in the graphics and text edge overflow and graphics width is basically the same, the ink is lighter than the image, shape indefinite graphics.

Gravure printing often encounters stencil and drag failures. These two types of failures exhibit different phenomena, causes, and solutions. However, many people, including some printing experts, are very difficult to deal with these two kinds of failures. Make a distinction. This article will make a detailed comparison of these two types of faults.

1. The phenomenon is different

Drag and drop is a gradual change from a certain part of the image and gradually disappears. It is shaped like an animal and is often called trailing.
The affixed version is different, it is in the graphics and text edge overflow and graphics width is basically the same, the ink is lighter than the image, shape indefinite graphics.

2. The reason is different

The cause of dragging is that there is an impurity between the doctor blade and the plate, and it extends to the back of the blade. When the scraper blows through the graphic part on the printing plate, impurities and the ink come into contact with each other. When the scraper scrapes out the force producing part, the impurities lag behind the blade and come into contact with the printing plate, which will drag the graphic.
Paste is mainly due to the scraper and the printing plate arc contact, that is to say the knife is very tight, the pressure is also large, the scraper scrapes through the printing plate graphic part, the long-pressed blade has a tendency to straighten, this is in the elastic range Within is allowed. When the scraper moves out of the graphic part, the blade touches the shoulder of the net and it will bounce like the ball hits the wall. When the blade is moving out of the plate graphic part, the scraper that is in contact with the graphic will sideways and cannot The plate is scraped clean, under the pressure of printing, the ink will overflow the graphic part, resulting in paste plate.

3. Different solutions

In the production, you will encounter the troubles of graphic dragging. Generally, you only need to use bamboo chopsticks to gently scrape it.
Encountered stencil problems need to be solved by loose knives and reducing air pressure.

4. Common to both faults

When the viscosity of the ink is relatively low, both dragging and stencil failures are prone to occur. Therefore, properly increasing the ink viscosity plays an important role in preventing the occurrence of the above two kinds of failures.