How to balance Taggant with Ink – 3
(Marker Ink) with Ink
– Simple Laboratory Test-
– III –
When the particle sizes of the pigments are in the following range one can expect trouble free printing and free flow of ink on rollers and ink duct.
- General Wet offset inks < 5-6 microns
- General Dry offset inks < 5-6 microns
- Intaglio inks around 20-25 microns
- Flexographic inks <5-8 micron (slightly courser is acceptable –e.g. 15 micron can be run with a high release anilox but not totally problem free)
- Writing or liquid inks which is powder based. Since they are Solubilised dye–the particle size should be theoretically zero micron.
- Get two or three grades of Taggants in particle sizes say mean 5 micron, mean 3-4 micron and mean 2-3 micron and test the result in the same way to see which works better.
- Once you short list the grade then the set of samples can be taken up for actual machine trial as there will be 10- 15 % variation in performance between machine and lab trials which are manually operated . Such minor variations can be easily adjusted on machines.
- Whether ink agitator will be required to ensure perfect blending of Taggant with the ink or not.
- Whether the final consignment could be obtained in small size bottles of 100 or 200 ml which can be shaken well and poured manually in the ink duct or directly on the roller.
- Whether the Taggant has tendency to sediment if the ink duct solution is not constantly stirred .
- Whether the Taggant blend well with the liquid ink and flow freely from the ink duct due to the continuous rotating action of the ink roller which continuously rotates in the duct once the machine starts working.
- The strength of the solution (percentage of the Taggant) which needs to be supplied.
- Whether adding 10- 20 % thinner at frequent intervals in the ink duct continue to maintain desired result or whether fresh solution is only needed to be poured in the ink duct.
- Since there will be no vibrating rollers in the inking unit , while taking machine trials the three grades of solution could be poured in three parts with a gap of 1 inch minimum and prints taken so that in one run the performance of the three samples can be tested without wasting much time .