TROUBLESHOOTING | CRACKS IN THE COATING LAYER
Solving the cracks in the coating layer
Step by Step
1. REDUCE YOUR DRYING PERFORMANCE
Cracks in the coating layer are encouraged by the dryer‘s high energy input. Control and reduce your drying performance where necessary.
2. CHECK YOUR FOUNTAIN SOLUTION SETTINGS
The emulsification of fountain solution slows down the drying of the printing inks. Check your fountain solution settings and adjust them where necessary.
3. CONTROL THE APPLICATION OF COATING
The lower the viscosity of a coating, the thinner the coating layer (two-roller-system). The result: Cracks become visible very fast. In this case choose a coating with a higher viscosity or increase the amount of coating you apply. But be careful: If you apply too much coating, running disturbances or blocking can be the consequence.
4. USE RETARDERS
Add TerraAdd Retarder G 12/111 to your coating. By means of this, you do not only slow down the drying of your coating, but also improve its running capabilities. Moreover, you reduce the danger of drying at the roller. Please contact our Technical
Services for the correct dose. A dose which is too high may lead to a blocking of sheets in the pile.
5. CHOOSE ANOTHER COATING
If all measures recommended here do not solve the problem, please contact our Technical Services.
6. CHOOSE FASTER DRYING PRINTING INKS
If your printing inks dry very slowly in relation to your coating choose a faster absorbent alternative if possible. By means of this, you can bring together the drying behaviour of inks and coating.
YOUR SHORT CHECKLIST
Measure: Increase performance
Influence factor: Fountain solution
Measure: Use less fountain solution
Influence factor: Coating viscosity
Influence factor: Troubleshooting
Measure: Apply retarder
Measure: Choose bigger anilox roller
Influence factor: Coating
Measure: Apply appropriate alternative
Influence factor: Printing inks
Measure: Use faster inks
Still have open questions? Contact us and we will support you with the application.CONTACT US
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