Flexo Printing

Flexo printing is a widely-used printing technique in the packaging industry. It utilizes relief elements on a flexible printing plate or cylinder to transfer the ink to the substrate. It is essentially a modern letterpress.

 

https://sasp20.empa.ch/documents/55926/76815/Flexo1_2.jpg/304eb23b-bad3-49f9-82fe-8fd7e5eae2bb?t=1586159133000
Schematic of the Flexo printing process and printing unit of the C600
Key features
  • Relief elements on a flexible printing plate can print on nearly any type of substrate
  • High variety of low viscosity inks can be used (UV, solvent, waterbased etc.)
  • Anilox roller made of chrome/ceramic
  • Web speed ≤ 80 m/min
  • Mass-printing technique
  • Resolution ≥ 150 dpi, ≤ 20μm
  • Film thickness 0.8 – 3 μm

 

https://sasp20.empa.ch/documents/55926/76815/FlexoExamples.jpg/aaf1d233-2a67-4685-9c55-94ff73c7287c?t=1586159212000
Flexographic printed silver electrodes and test structures. 3-D image to determine layer-thickness (~100 nm for the printed Ag structures)