Flexo printing techniques for low gram surface paper
When using low gram base paper to make corrugated board surface paper, there will be corrugated board surface exposed corrugated traces. It is easy to cause obvious corrugated and can not print the required text and text content in the low concave of the corrugated board. In view of the uneven surface caused by the corrugated board, the flexible resin plate with good resilience should be selected to do the printing plate to overcome the defects of unclear printing and exposed bottom. In particular, the A-type corrugated board produced with low-gram paper will suffer great damage to the flat pressure strength of the corrugated board after printing with the printing press. In addition, the side pressure strength of the corrugated board will also be greatly damaged after the printing roll and embodying roll.
If the surface of corrugated board rickety difference is too large, but also easy to lead to corrugated board line production of corrugated board warping. The warped board will lead to overprinting inaccuracy and printing grooving out of gauge phenomenon, so the warped board should be pressed before printing. If the forced printing of uneven corrugated board is easy to cause the rules, it will also cause the thickness of corrugated board to decrease.
Color difference troubleshooting skills of carton printing in the same batch
How to improve the quality and process of corrugated carton printing, in a production, the four-color machine printing process appeared in the printing sheet color accurate, but the whole batch of printing specifications are inconsistent, resulting in post-processing can not be carried out. The causes are analyzed as follows.
Front gauge height positioning is not appropriate. In the former specified position, generally put 3 printed paper superimposed together under the front gauge, to twitch when the feeling of pressing paper, and the paper can twitch freely. Before the high or low will cause the paper positioning is not accurate, printing product specifications are of course not consistent.
The side position is not accurate, which includes the height of the side gauge pressure board and the tension of the paper roll. If the height of the paperboard and the tension of the paper roll is not appropriate, the paper is not pulled in place, or pulled over the head, resulting in the paper side is not accurate. In general, the height of the side gauge pressing board should be 3 times the thickness of the printed paper, and the distance of the side gauge pulling paper is 5-8mm.
