Squeezed edges (flexography)

The main reason for squeezed edges is too much pressure of the printing plate onto the anilox roller and the substrate. This results in the flexible image carrier squeezing the screen dot to be printed onto the substrate and creating a squeezed edge around the dot. All this leads to an increase in tone value, which can influence the image to be printed. Incorrect ink viscosity and an incorrect scoop volume can lead to squeezed edges. Another reason can be a worn printing plate.

Solutions to squeezed edges:

• Examine the pressure delivery from the printing plate to the substrate and readjust if necessary. It should be tried to get a so-called kissprint, i.e. as little pressure as necessary.
• Inspect the ink viscosity in conjunction with the pick-up volume of the anilox roller. And adjust to each other if necessary.
• Check the printing plate for signs of wear and tear, as well as for sufficient flexibility (printing plate may have become too hard). Change the printing plate if necessary.
• Review the plate thickness and plate mounting tapes for correct thickness.