Difference in monochrome dot gradient between Kraft Food Paper Boxes for gravure and flexo printing

Difference in monochrome dot gradient between Kraft Food Paper Boxes for gravure and flexo printing

Gravure printing no dot increase worries, and flexo printing must face the problem of dot increase, so when the field and dot gradient appears on the same page, must pay special attention to. The following monochromatic dot gradient as an example of gravure printing and flexo printing process comparative analysis.

Gravure printing process: 150 lines/inch printing plate, minimum dot 1%, can be printed in gradual change with the dot, by controlling the plate mesh depth (35 ~ 50μm) to achieve the required field density, and the effect of gradual change from the field to the grid is guaranteed, can achieve stable mass production.

Flexo printing process: CDI plate, plate plus network number of 150 lines/inch, the minimum dot 1%. Printing field density is mainly determined by the roller ink storage volume (BCM value), plate adhesive tape, plate material and ink also have a certain impact on the field density. In dot gradient, flexo printing to face the problem of dot increase, the minimum dot 1% increase to 5% ~ 8%, if directly to 0, visual fracture will be produced.

At the same time, with the high number of line, small dot printing plate matching roller line number must be high, and its ink storage will be reduced, printing on the gradient pattern in the field density will be limited. Therefore, the current flexible packaging flexo printing production generally will not use 150 lines/inch plus network number and 1% of the minimum dot.

The above is a comparative analysis of monochrome flexo printing and gravure printing gradual transition to the grid. This problem also exists in the printing of flexo printing multi-color overprinting gradual transition to the grid. It can be said that flexo printing soft packaging is the current weakness of the "gradual change to the network, dot increase control, the use of low number of line printing plate".