Factors Affecting Box Printing Part Two
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Factors Affecting Box Printing Part Two

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Color box is a common packaging box. We have shared several factors that affect color box printing before. Today we will share some other factors that affect color box printing.

1. The effect of ink transfer

The printing process is actually the process of ink transfer. Generally speaking, the ink transfer rate of offset printing is relatively low, about 38%. After the printing plate is inked with the blanket, the ink transfer rate is about 50%. When the blanket contacts the paper again, the ink transfer rate is about 76%. Therefore, it is critical to control the transfer rate of the ink. Ink suitability, ink balance, printing plate, blanket performance, paper, printing machine, etc. will all affect the transfer of ink.

2. The effect of paper suitability

The suitability of paper is mainly reflected in smoothness, whiteness, stiffness and so on. Paper with high smoothness requires a relatively small amount of ink, while paper with poor smoothness requires a relatively large amount of ink. In the printing process, the amount of ink required for different papers varies according to their surface conditions. Under the conditions of the same variety, same weight, and the same price, paper with higher smoothness and whiteness has better printing quality than paper with lower smoothness and whiteness.

paper box

3. Influence of plate suitability

The quality of the base sand of the printing plate, the hydrophilicity of the metal plate surface, and the lipophilicity of the coated polymer resin film surface are related to the suitability of the printing plate, and affect the ink transfer and the ink balance of the plate surface. In the process of plate making, the quality of exposure and development will also affect the performance of the printing plate.

4. The influence of ink balance

Ink and wash balance is a relative balance, not an absolute balance. In the process of high-speed operation of the equipment, the graphic and non-graphic parts of the printing plate are both inked and watered, and there is mutual penetration, so ink emulsification will inevitably occur on the printing plate. If the amount of water and ink is not well controlled, it will inevitably deepen the emulsification of the ink, resulting in smeared and dirty plates during printing. When printing, the method of reducing the amount of water and increasing the amount of ink is usually adopted, but sometimes the amount of ink is also reduced. In addition, ink emulsification will vary with environmental conditions. In the actual printing production, the ink viscosity and the pH value of the fountain solution should be controlled according to the actual situation.

5. Influence of printing pressure

Printing pressure refers to the interaction force between the printing plate cylinder and the blanket cylinder, and between the blanket cylinder and the impression cylinder. It is a necessary condition for ink transfer. The printing pressure is too small, the ink is not easy to transfer, and the ink is light and empty. The printing pressure is too high and the ink volume expands to the non-graphic part, which makes the dots increase seriously, the image is distorted, and it is also easy to reduce the printing resistance of the printing plate and the blanket. Therefore, only proper printing pressure can ensure uniform ink color and uniform density.

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