Understanding of Flexographic Printing Operation

When adjusting the hue of spot color ink, sometimes the color is too dark. Some operators add some stabilizers or blockers to the ink to dilute the ink to reduce the hue. But at this time, we will encounter the problem of water ripples when printing the anilox rolls with the low net number.Understanding of Flexographic Printing Operation

     In another case, the hue deviation of dot printing on the field should be adjusted. If there is a color deviation in the field overlapping with each other, the upper layer of ink should be adjusted to achieve the purpose.Understanding of Flexographic Printing Operation

     The above is my personal experience. I hope to learn from my peers and improve the operation level together.Understanding of Flexographic Printing Operation

1. Bubble problem of Flexo Ink:Understanding of Flexographic Printing Operation

     The operator of flexo printing with ink may encounter the problem of bubbles. In fact, this problem should be considered from the ink itself and the mechanical device.Understanding of Flexographic Printing Operation

     First, look at whether the viscosity of the ink exceeds the normal range. If the viscosity is too large or too small, bubbles will be generated. Secondly, an appropriate amount of defoamer should be added to the ink. Some ink used by the connecting material is mixed with several different connecting materials according to a certain proportion.Understanding of Flexographic Printing Operation

     At this time, it is necessary to selectively add the corresponding defoamer to solve the problem. If the above method can not solve the problem, it is necessary to add a baffle with a certain width and length into the ink tank. Understanding of Flexographic Printing Operation

     The baffle is adhered to the tool holder with double-sided tape, and the lower end is in contact with the ink tank, so that a narrow space is formed between the two and the anilox roller, and the ink reflux space is very small, so that the bubbles are solved.Understanding of Flexographic Printing Operation

2. Flexo overprint

     The overprint accuracy of flexographic printing is related to product quality and yield, which is a problem that every operator must pay attention to.Understanding of Flexographic Printing Operation

     In the process of adjusting the machine, start from the second color group. After adjusting the pressure, it is necessary to align the rules of this color group with the specifications of the previous color group. After the machine is officially started up, a little fine adjustment can quickly adjust the rules and greatly reduce the waste.Understanding of Flexographic Printing Operation

      When there are three rules, in the case of one rule in the middle, the registration of the middle rule on the other side will determine whether the boundary plate is required.Understanding of Flexographic Printing Operation

      When solving the overprint problem, we should consider whether the tension is appropriate, the speed of the machine, the influence of drying on the paper expansion, and take a compromise to solve the problem. When readjusting the pressure after the boundary plate, the pressure of the anilox roller cannot be adjusted, otherwise the previous work will be wasted.Understanding of Flexographic Printing Operation

3. Hue of ink

     When adjusting the hue of spot color ink, sometimes the color is too dark. Some operators add some stabilizers or blockers to the ink to dilute the ink to reduce the hue. But at this time, we will encounter the problem of water ripples when printing the anilox rolls with the low net number.Understanding of Flexographic Printing Operation

     In another case, the hue deviation of dot printing on the field should be adjusted. If there is a color deviation in the field overlapping with each other, the upper layer of ink should be adjusted to achieve the purpose.Understanding of Flexographic Printing Operation

     The above is my personal experience. I hope to learn from my peers and improve the operation level together.Understanding of Flexographic Printing Operation