Chris Heusch Technical Support & Consulting
NOTES: ANILOX ROLLS
Date:
Types of anilox rolls:
-chrome plated, mechanical engraved
-chrome/nickel plated, very hard
-mechanical engraved, ceramic covered
-ceramic, laser engraved
Laserengraved, ceramic anilox rolls feature most even engraving, best ink release and excellent
durability. Roll is polished after engraving to reduce recast (ashes) and then sealed with epoxy.
To protect epoxy sealant roll should not be exposed to pH higher than 10.0 and not be exposed to
high pH for extended period. Rinse rolls with clear water after cleaning with high pH soap; to
prevent water stains wipe roll surface with dry rag or with isopropanol.
Three important engraving specifications:
-number of cells per linear inch (linear centimeter) = lpi
-spacial arrangement of cells to each other in degree angle (e.g.: 45 or 60)
-engraving depth of cell in my
Theoretical transfer volume (carrying capacity) is calculated from above specs and is expressed
in billion cubic microns per square inch roll surface or simply bcm. The metric version is cubic
centimeter per square meter roll surface.
In screen (halftone) printing it is recommended, that anilox rollers have four times the screen
ruling (lpi) of the image screen to be printed. E.G.: 85 lpi art calls for min. 340 lpi anilox rolls.
Screenangle of anilox rolls has to be avoided by artwork screens to avoid moire.
60 degree screenangle reduces doctor blade wear slightly over 45 degrees and favors cleaning.
Cell depth should not be more than half of cell width to allow for good ink release.
Remember: the cell of a 400 lpi anilox roll is only 0.002" wide; the finer screen anilox - the
harder to clean.
Keep rolls clean at all times.
Keep roll faces and journals coated with grease/veg.oil.
This: consult/notes/anilox10.96