Slurring

Slurring is when the shape of the halftone dot changes. The printed image then appears to be displaced as the round halftone dot assumes an oval shape.

Two types of slurring exist - on the one hand, in the direction of printing (circumferential slurring), and on the other hand, transverse to the direction of printing (lateral slurring). These effects lead to a reduction in quality, and come from the set up and interaction of the plate, blanket, and printing cylinders, as well as on other material influences.

Remedy:

• Check the printing pressure adjustment, and reduce as needed
• Maintain recommended packing thicknesses (control with a cylinder gauge)
• Mount the blankets carefully, and use a torque wrench when stretching
• Insert the blankets in the printing press in the indicated weave direction
• Clean the grippers, and adjust them as needed