Digital BW, The Print

----- Original Message ----- 
From: "Editor P.O.V. Image Service" <editor@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Monday, December 29, 2003 4:45 PM
Subject: Re: [Digital BW] Multihead BO (theoretical more or less)


> 4 colour printer should be adequate. The new R800 (7  heads,
>not yet available) has the finest droplet size so far but which
>existing 4 colour printer comes next ?
>

>The C84 has 3 picoliter minimum drop size.. with six sizes of
variable
drops.. It's designed for  the DuraBrite inks.. It's Black head
has 180
nozzles, the color head has 177 nozzles (59 per color)<

The six sizes are most likely not all used in one setting. At
2880 you get most likely a range of 3 with the minimum droplet
included. You need all the CMY heads to add a substantial nozzle
quantity in this case. Wonder whether the droplet size variation
is equal for the CMY and the K head. Any idea ?


>If you go to 6 colors, the 960 has 2 picoliter drops.. BUT, it's
designed for dye-based inks.. The Black head has 192 nozzles...
The
color head has 480 nozzles (96 per color).  I don't know haow
many sizes
of drops the 960 has..<

Has it been used with third party pigment ? The 2 picolitre is
nice and the range of droplet sizes doesn't matter that much as
long as the number of heads used is high enough to divide the
range so the printer is forced to use the minimal droplet. 672
nozzles means 3,7 x the number of black head nozzles of the Epson
10000 that can print acceptable BO with 8 passes. Minimum droplet
size of the last is 5 picolitre. Using the 960 with 4 passes
still brings 4,5x better quality potential.

Meanwhile I wonder whether the deflection of the minimal droplets
is so high compared to bigger droplets that there is no advantage
because the detail is lost from say 50 to 100%. That can only be
checked with trials.

Ernst