The series entitled “Labelprinting – experience gained in practice” looks at
everyday challenges encountered in labelprinting and how to overcome
them. In this issue we take a look at “Cloudy” printed image in halftone printing.
Problem
“Cloudy” printed image in halftone printing
Possible solutions:
- The combination of adhesive tape, printing plate and substrate is not ideal. Some printing plates require a softer adhesive tape in such cases and others a harder one.
- Harder printing plates tend more towards producing “cloudy images”, i.e. use softer plates!
- Clean the anilox roller thoroughly.
- Use an anilox roller with a higher number of lines (l/cm).
- The surface tension of the substrate is either too high or too low. Increase or reduce the Corona surface pre-treatment.
- Check the quality of the substrate and use a new reel, if necessary.
without clouds
with clouds
Roger Oberholzer
Process Technology