Digital BW, The Print

Hi Paul,

Can you elaborate on the time frame it takes for the ink dispersant to oxidize?

Mike Brubaker

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On Tue, 1/10/17, Paul Roark roark.paul@... [DigitalBlackandWhiteThePrint] <DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:

 Subject: Re: [Digital BW] Re: New process, new ink, new printer?
 To: "DigitalB&WPrint" <DigitalBlackandWhiteThePrint@yahoogroups.com>
 Date: Tuesday, January 10, 2017, 1:50 PM
 
 
  
 
 
 
   
 
 
     
       
       
       Consistent with your experience, my
 experience is that one of the major factors in clogging is
 the ink load -- how much of the ink is particles v. fluid. 
 The MK is the highest.  It typically clogs the most.  This
 is probably true within any "family" of inks.
  
 The quality of the printer is also
 a major factor.  My 1400s and current 1430 can go a very
 long time with no clogs anywhere.  It might relate to how
 well sealed the head is when it's parked.  Unlike my
 1400 family printers, my 7800 will sometimes show a clogged
 K after a two week sit.  It clears easily, however -- until
 the head totally crashes, which it just did.  There does
 come a time, depending on printer and degree of abuse
 (including from thick artsy papers and media), that the
 head, etc. will no longer clean.  For me, that's simply
 a cost of doing business that is spread over enough prints
 such that it's not a major factor in my per print
 costs.
 Old carts can also be a source of
 problems -- all rubber parts lose elasticity, including the
 seals and sometimes internal filters.  Leaky seals can
 cause bubbles; disintegrating internal sponges clog heads. 
 That said, I've had very good luck with modern empty,
 refillable carts; they last for years.
 Pigment dispersant (not the
 suspension medium or "clear base") appears to
 slowly oxidize.  The pigments then start to clump
 ("flocculate").  These larger particles start to
 fall out of suspension and can contribute to clogs. 
 Don't use ink that is too old.  Since the large
 particles settle faster, don't pull pigment from an old
 bottle just after agitating it; wait a day for settlement
 and then avoid the very bottom of the bottle.
 There are lots of factors and
 possibilities for problems, but overall and on average, our
 modern inks and printers deliver very good
 results.
 Good luck with the
 printing.
 Paulwww.PaulRoark.com 
 
 
     
      
 
     
     
 
 
 
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