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I-Motto: mottling

Revealing offset mottling

  • Print papers to reveal printing unevenness
  • Characterise the actual “ink speed immobilisation” rate on a paper printed in offset
  • Test set-off quickly with industrial inks
  • Analyse 10x40 cm formats that simulate industrial printing

The little story of the pilot

Mottling is a recurrent issue in printing, especially on MWC and art coated papers.
Various tests exist, using IGT or Prüfbau presses, but these have yet to be perfected.
These laboratory tests still do not correlate with the rating of a batch of industrial papers, because they do not allow the printing conditions to be varied.
Industrial conditions can be reproduced with the i-Motto, a laboratory pilot developed by the CTP which replicates the printing kinetics, the intervals between prints and the number of units on an industrial machine.

Characteristics


The i-Motto device has been designed to be as automated as possible, and can hence be integrated as both a production control system and a paper development pilot tool.
It is computer-controlled so that operating cycles can be programmed, including amount of ink to be used, homogenisation time, number of printing units simulated and backtrap time between each.

  • Use of industrial ink
  • Use of gapless industrial blankets
  • Simulation of all printing kinetics on a sheetfed press machine, web presses, etc.


Possible studies

  • Characterisation of a paper or panel of papers in terms of backtrap mottling, for sheet and web printing machine applications.
  • Characterisation of ink speed immobilisation.
  • Comparison and characterisation of set-off on a paper or batch of papers.
  • Study of wet mottling using a wetting system upline of ink printing.


Characterisation of mottling

The CTP proposes characterisations adapted to each type of possible study.
Assistance from the CTP is required when using this device, to explain the procedures chosen and interpret the results obtained.

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