Editing Anilox (section)

==Usage== 
Depending on the [[image resolution|detail]] of the images to be printed, the press operator will select an anilox roll with a higher or lower line screen. "Line screen" is the term used for the number of cells engraved on the anilox. Low line screen rolls (100-300 lpi) are used where a heavy layer of ink is desired, such as in heavy block lettering. Higher line screens (500-1500 lpi) produce finer details and are used in [[CMYK color model|four-color process]] work such as reproducing photographs. Often a job will require a different line screen for each color to be printed. Experienced press operators are skilled at determining the appropriate rolls for a given print job.

Depending on the design of the printing press, the anilox roll is either semi-submerged in the [[ink]] fountain, or comes into contact with a so-called metering roller, which is semi-submerged in the ink fountain. In either instance, a thick layer of typically [[viscous]] ink is deposited on the roller. A [[doctor blade]] is used to shave excess ink from the surface leaving just the measured amount of ink in the cells. The roll then rotates to make contact with the flexographic printing plate which receives the ink from the cells for transfer to the printed material.

Anilox roll selection should be based on cell volume or capacity of the engraved cells. Print results are accomplished with this volume, which transfers to the printing plate and then to the substrate. In general transfer, efficiency is approximately 25% to the substrate. Cell count remains the same for the life of the roll, while volume changes over time due to wear, plugging and damage. Cell count accommodates volume at various cell shapes available from the laser engraving process. The same cell count can be engraved to or wear to different volumes.

=== Chambered Doctor Blade ===
Contemporary ink metering systems employ a self contained system known as a chambered doctor blade system which is basically a manifold which delivers ink to the anilox roll. Ink is pumped through a hose to the chamber which fills to capacity. Ink is retained within the system by end seals and doctor blades. One blade works as a retaining blade, simply holding ink within the chamber. The other reverse angle blade works as previously described, removing excess ink from the engraved surface of the anilox roll.

Chambered doctor blade systems are recognized for high quality, consistency and accuracy removing the influence of press speed and some human subjectivity.