The published articles are meant to primarily educate the students in printing to supplement their knowledge in the field of Printing. These are not simple Glossary of printing terms, but to the extent possible every term has been explained in brief so that it can be of some use to the students who appear in some sort of examinations and interviews.
I served the Printing Industry for over 40 years
in various capacities, a major part in an Security Printing Organization. In order not to waste the printing and paper related knowledge which I gained over years, I decided to keep them in public domain for the reason stated in prepara. Most of the illustrations - over 90% - have been generated by me to explain the terms suitably.
While I am not sure to what extent the published content will help, if the content is going to be of use to some one in some manner, I will be greatly satisfied.
Your views may be sent to me (
nrj_1945@yahoo.com) for my record and correction wherever needed.

TOTAL NO OF PRINTING TERMS

POSTED TILL NOVEMBER, 2012

- Over 400 terms-

Click on this line to read from 'A'

Friday, July 5, 2013

How to balance Taggant with Ink- 1

How to balance  Taggant  
(Marker  Ink) with  Ink  
-  Simple Laboratory  Test-
- I -
(Written  by   :   N. R. Jayaraman )
Many  firms use  the invisible markers (Ink) called Taggants  mixed with  the  printing  inks  to add  security  to  their documents  as  Brand protection measure.  Most  preferred  medium  of  printing in such  cases  is  Flexographic  printing.   In  some   of   the   countries  the  invisible   taggant   whose   presence   can   be  authenticated  only  by  special   gadgets   supplied   by   the  same  taggant   supplier  is  used by  pharmaceutical  and  other  consumer product  manufacturers  to   print   the   cartons   and  labels  as   their  products  are  more  prone  for counterfeiting.  The   printed  documents  on  which   the   special  ink  is  used  includes   metallic    foils  or  cartons   meant   for  packing   the  products. 

The   principle   elements   of   the  inking  units  (Taggants  mixed with liquid  alcoholic  based  inks  for faster  drying  on  the  print medium)  fitted  on such   printing   machines   are  very   simple  and  almost  same   except for  design   changes   on   the  machines. 
Usually   the   medium   meant   for   taking   the   print   is   fed  only   in   roll   form  except   in  rare   cases   when   the   sheet   format   is    deployed.   

The  inking  unit    on  the   machines   consists  of   the  following :-
  1. An  ink  tub  carrying   the  liquid  ink   mixed   with   the   invisible    taggant   powder.
  2. Ink  Transfer roller  which inks  the  plate  that  prints.  The  ink   transfer roller usually  is  covered  with  some  material  like  woven cotton   fabric  cloth   similar to  wool  in  texture   that  absorb  the   liquid  ink  and transfer  it  on   to  the  plate.  In  simple  word ,  the   material    used  for    covering    the  cylindrical  shaped  inking roller  is  something  like   rubber  stamp  ink  pad  which  has  some   kind   of   fabric   material   carrying  wet  ink  or  similar  to  the  fabric   hose   used  in the  dampening  unit  rollers  seen  on   the  Wet  Offset  printing  machines. 
  3. The ink transfer  roller  is   usually  ceramic  based  or   polished  steel    cylinder  tightly  covered   with  thick   fabric   cloth .     
  4. Impression  cylinder  in  the  form  of   steel  roller  that  press   the medium  against   the  plate  that  transfers  the  inked   image.
  5. In  some  cases   the  ink  agitator is  also  found  fitted  in  the  ink duct  to  continuously  stir  the ink  to  ensure  that  the   taggant  powder  do  not  remain  as  sediment  in  the  ink  tub as  the   size   of   the   particles    are   very   very   small   and   require   to   travel   with   the   ink   to   stay    on   the   print    medium  for   detection   purpose. 
The  following   illustration   will  explain  the model   inking   system as   narrated above.
In  order  to  verify  whether  the  taggant   freely  flows  along  with   the  ink  to   print  and  produce  desired  level   of   readability  for  authentication, and  whether  the   strength   of  the  taggant  continues to remain within  readable  range  throughout ,   simple   offline    testing   should   be   conducted  to   ensure   mixing   correct   proportion   of   the   taggant  with   ink   since   the   taggant   is   very   costly.  The   effect  and    behavior  of  the  taggant  can  be  verified by  conducting  the following Laboratory  experiment  offline  before   finalizing  the  quantity  of   the   taggant  to  be   added  with   the   liquid   ink.   Generally   the    particle   size   of   the  taggant   should   be  very  fine.  Read  in  the  last   the particle   sizes   required   for   various   processes.   This  experiment   will  save   the   time   wasted    on   the   machines    for    testing   and   also   prevent   wastage    of   the   print   material.
..........to  be  continued

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