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 -2

How to balance  Taggant  
(Marker  Ink) with  Ink  
-  Simple Laboratory  Test-
- II -
(Written  by   :   N. R. Jayaraman ) 

SIMPLE   PROCEDURE  TO  TEST  THE   EFFECTIVE   WORKING   OF  THE TAGGANT  VIS   A  VITHE   INK - TAGGANT     RELATIONSHIP

 The  lab  testing  procedure  for   Ink - Taggant  working   involves  the  following  steps.   

1) Prepare  two  small  metallic  hand   roller  say 2” to 3”  wide  (see illustration).
  Tightly   cover   one  of  them  with  the    same  kind   of   fabric  cloth  used   on   the  ink  roller  fitted   on  the   Flexographic  printing  machine  for  which  the ink  is  meant  to  be   supplied.  The   other  roller  will  be  used   as  impression    roller.
 

2) Then  apply  'x'   quantity   of  liquid   ink  (same   as  used on the  printing machine for which  the special  taggant  is supplied) mixed with  the  taggant  on  the  hand  roller.   Both   the   taggant   and   the   liquid   ink   should   be   same   as  proposed   to   be   used   on   the   machine,   lest    the   lab    test    may   not    truly   reflect   the result .


3) Once  you  have  dampened  the roller with the liquid ink containing   taggant,  roll  it  over  on  some  smooth  flat  surface  base   like   steel  or  glass  plate  to  ensure  that  the   liquid  ink  gets  spread  into  the  fabric  sleeve  without  showing   patches  on  its  surface.  This  also    ensures   that   the  ink   gets   spread   uniformly   on  the  roller  carrying    ink . 

 

 4) While   the  hand  roller is  still  wet  with  ink,  apply  ink   on  to  a  rubber stereo  model  plate  and  take  4-5  prints   on  the  sample  paper  or medium  to  be  actually printed.  Apply pressure   over  the   paper   or  print   surface   with   another   empty   metallic   roller already  kept   ready.  


Without  recharging  the  hand  roller  again  with  fresh  ink ,  take  few  prints  each   time   applying  the  ink  from   the  same  non  recharged  ink  roller  to  examine  the  quality and   quantity  of  the  print  produced. 


This   process   will  show  whether the   taggant   has been  properly  and  uniformly transferred  on  to  the  foil  or  the  print  surface  along   with   the   ink   to  give   desired   level   of   readability  on   the   special  Gadget  that    reads  the  presence   of  minimum   'n'  no  of   particles   to  authenticate  the  genuine  product.   


5) After  taking  few  prints  add   same  'x'  quantity  of  diluted   liquid   ink   (without  mixing  the   taggant)  on  to   the  inked  roller  say once , twice  or  thrice  and   take  further prints  to   examine   whether  the  strength  of  the   taggant  still  remain  the  same  or to  what  extent  the  strength   has  gone  down .


6) This   test   is   important   for   two  reasons.   The   analysis  of   the   print   thus   taken   will  indicate   whether   the taggant   mixed   in  the ink   gets  fully   transferred   on   to   the   print   surface   or  partially   stick  with   the  fabric   fixed  on  the  inking  roller.   

7) After   analyzing   the   prints   thus   taken  as  stated   under   Serial   No 4 and  5,  allow the  roller  to  dry and  then  examine  whether any  dried  powder  particle   falls  from  its surface.   There   will   always   be   some  amount   of   dried   powder  particles   say   2-3  %  sticking   to   the   surface .   But  it   should   not   be  high  which   may   otherwise   fail   the  use   of   the   taggant  for   authenticating   with   special   gadget .  The   second   factor  is  the  concern  that  the  dried   powders  may  fall  and  clog  the  rollers  bearings   or some  moving   parts   of   the   machine.   


Once  it  is  confirmed  that  the taggant   powder  gets   transferred  freely  and  fully  from  the  cloth  covered  inking  roller, it should not cause concern   and   actual   machine   trial   can   further  be conducted with full  settings.  If  the initial lab test  itself  show  high  percentage  of   the  dried  taggant   powder  on  the    rollers  or sediment  in  the   ink   duct , then    it   means   that   the    taggant    has    not    mixed    well   with   the   ink   and   the  particle   size   of   the   taggant    needs   to   be   adjusted    for   smooth   working.   
-----to be continued 

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