Digital BW, The Print

On 06/03/2011 06:42 PM, Paul wrote:
> I was once told that some of the "dye" inksets actually use a hybrid
> black that contains very finely ground carbon as well as a blend of
> dyes. The reason for this initially was to hold down bleed in text
> printing. The presence of carbon would explain some of the black
> "dye" ink stability we've seen in tests.
>
>
> Paul www.PaulRoark.com

Paul,

There are other methods too for reducing black bleed on matte papers, I
think the one headed version of the Canon iPF5100, the iPF510, has a two
component fixation of the matte black with the cyan ink to achieve that 
goal. Printing cyan under black text etc is an old graphic arts trick 
but having the two as reagents is new.

The Canon Pixma IX7000 uses a clear preparation ink to improve the 
surface of plain papers before the other inks are squirted. Some third 
party suppliers call their clear ink for that printer a gloss enhancer. 
Wonder how that works in practice :-)

Your observation that dilution of the HP Vivera pigment PK delivers 
better Dmax than the straight PK on gloss media could well be explained 
on the same grounds. The PK is used as the darkest grey ink in the HP 
quad mode for matte papers, if it had been optimised for gloss printing 
it most likely would have too much bleed on matte papers.

For HP printers it has been common to use a black pigment ink in 
printers that had dye for the colors. Even early Deskjet models had it. 
That thermal heads could not work with pigment inks was a myth right 
from the start.


-- 
Met vriendelijke groeten,   Ernst

Try: http://tech.groups.yahoo.com/group/Wide_Inkjet_Printers/

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