Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@y..., "jimhayes361" 
<jimhayes@j...> wrote:
> --- In DigitalBlackandWhiteThePrint@y..., "azshtr" <dave@t...> 
wrote:
> > Hi all,
> > 
> 
> > lines and the BLACK line was clogged again! This time it sat 
> > unused for only 2 weeks. After I removed the system and 
flushed 
> > the line with a syring, sucked ink back into the line and 
> > reinstalled it, I got a perfect head pattern.
> > 
> > Is this normal? A clogged line after 2 weeks seems 
excessive to 
> > me. Anyone else have this problem and what are you doing 
to 
> > avoid it? (the obvious solution is to not let it sit unused for 
very 
> > long) Thanks for any insight.
> > 
> > Dave Tevis
> 
> After two 1160s an an 1280, both CIS and CFS, and vacuum 
filled carts, 
> old piezo and MIS VM and FS ink, and two years, my conclusion 
is that 
> two weeks is WAYYY too long! It depends on your climate and 
the 
> specific printer, some are better than others- but the ink has to 
> negotiate a 90 degree turn and the head was not made for 
pigment inks.
> 
> I have a hot and dry climate here and have to control it so 
humidity 
> is above 40%RH and temp is below 77 degrees F. Even so, 
through 
> experience I now run a fast draft purge pattern every 12 hours 
> followed by a nozzle check. If I don't I waste more ink in clearing 
> clogs than printing the purge pattern. I suspect that is extreme 
for 
> most people, maybe once a day to once every three days is 
okay. BUT 
> NOT two weeks! You have to determine what interval works for 
you- 
> start out frequent and then less frequent- until you discover the 
> point where you clog up.
> 
> I've come to expect that wasting some ink in printing purge 
patterns 
> vs cleaning cycles is just the price we pay for running these 
nice 
> inks through the printer. I heard that the 2000P had more 
gentle ink 
> path through the head- if so I would expect the 2200 to be the 
same as 
> it uses pigs as well.
> Jim H.

You probably understood where my clog was occuring but just to 
clarify... its the ink in the line that is drying, not the head that is 
clogging. I don't see what a 90 bend has to do with it. The line 
drys out and therfore the head can't spray ink with a vacuum in 
the line. Clear out the line and it immediatly works great. In the 
past I've never had this problem. Just the last 2 systems I had on 
this machine. Although I admit that 6 months is way to long, I 
would not expect dryed ink in the line at 2 weeks. I need to stay 
on top of the printing to keep this system running, but problems 
at 2 weeks I would expect a warning from MIS about the potential 
of this issue.
 
Dave