Nicoat

Problem: Backtrapping and ink buildup on blanket

 

Solutions:

Too Much Pressure Between The Blanket And Impression Rolls

• Reduce pressure between blanket roll and impression roll to kiss pressure. To do this, back off pressure to minimal or no coating, then readjust to a continuous film across the sheet. Adjust coater roll accordingly.

Blanket Is Carrying Too Little Coating

• Increase amount of coating to minimize backtrapping but no enough to create an orange peel effect.
• Increase viscosity, if necessary.
• Reduce pressure between blanket roll and impression roll to kiss pressure. To do this, back off pressure to minimal or no coating, then readjust to a continuous film across the sheet. Adjust coater roll accordingly.
• Nicoat recommends that you use a hard smooth blanket. Check with your blanket manufacturer.

Too Much Ink Being Applied At A Print Unit

• Adjust ink sequence.
• Check with ink manufacturer about increasing the ink strength to reduce the thickness of the ink film.
• If possible, apply ink in 2 hits.

Ink Sequencing Is Wrong

• Adjust ink sequence.

Ink Tack Is Wrong

• Check with ink manufacturer.

Ink Type Is Wrong

• Check with ink manufacturer.

Ink Is Picking Up Too Much Water From The Fountain Solution

• Check with ink and fountain solution manufacturers.

Coating Is Not Wetting/Trapping Properly Over The Wet Ink

• Consult Nicoat about adjusting the formulation of the coating to increase its wetting properties.