Ink thickness is uneven

It is usually occur when large surfaces are printed…..

It is usually seen during printing with large surfaces. Possible causes and suggested solutions are as follows.

Pad based causes

• Pad shape may not be appropriate, try different shaped pads.

Cliché based causes

• Cliché type may not be suitable: use of steel cliché causes less ink accumulation than polymer cliché.
• The cliché depth may be wrong: a new cliché should be prepared at the appropriate depth.
• The transmitter type may be incorrect: a new cliché should be prepared with a different transmitter.
• Cliché placement may be wrong: Printing of the long lines in the design should be tried by rotating the clichés in different directions.

Ink based causes

• Ink may be too thin; the amount of thinner added to the ink must be reduced.
• The ink may be too thick: the amount of thinner added to the ink must be increased.
• The ink-additive ratios may not be appropriate: the ink mixture must be prepared at the correct ratio before being placed in the ink tray.

Material based causes

• The surface of the material may be deformed: a suitable type of pad should be used.

Other causes

• On open ink tray machines the stripping blade may be too soft: a suitable stripping blade and ink tray should be used.