Dot Gain

Problem:

Plate curves may need to be verified.

Solution:

Have prepress adjust plate curves, if necessary, and consider GRACoL®/G7* certification.

______________________________________________________________________

Problem:

Check that the fountain solution is fresh and within specification.

Solution:

If needed, adjust chemistry to manufacturer’s recommendation.

______________________________________________________________________

Problem:

Fountain solution temperature may be too warm.

Solution:

Adjust fountain solution temperature in pans to proper temperature.

______________________________________________________________________

Problem:

Ink form rollers may be too warm.

Solution:

If necessary, adjust form rollers to recommended temperatures.

______________________________________________________________________

Problem:

Blankets may be packed improperly or too much pressure exists.

Solution:

Check packing and pressures.

______________________________________________________________________

Problem:

Slurring or doubling appears in halftones – often confused with dot gain.

Solution:

Check cylinder pressures, blanket tension, and roller slippage. Check mechanical operation of unit.

______________________________________________________________________

Problem:

Rollers or blankets are too soft or not set correctly.

Solution:

Condition or replace rollers and blankets and set to manufacturer’s specification.