Digital BW, The Print

pr_roark wrote:

> (Does the HP Z3200 have a way to agitate its carts continuously?)

The carts are 130 ml on the Z3100/Z3200 and within each is a 
membrane pump that pumps the ink out from beneath the ink 
content, the same pump also stirs that ink content above it, 
more when it can not pump ink away to the head and less when 
the ink can flow away to the head. There will be a valve in 
each ink channel that opens on demand like there are on the 
air pressurised models of Epson. I knew about the cart pump 
but wasn't sure about its ink stirring so I just cut the top 
of an empty cart, rinsed the ink out and put clear water in. 
Actuating the pump a plume of black ink (left in the pump 
chamber) came from the bottom, less with a syringe needle in 
the outlet, more without the needle. The Z models go in 
sleep mode when idle but will awake several times a day to 
check nozzles etc and it is likely that the pumps are 
actuated then.

Whether thermal heads need lower viscosity inks has to be 
seen. The HP Latex printer introduced on the Drupa 2008 had 
thermoheads to my surprise. HP has a pi\ufffdzohead design of its 
own but decided to use a thermal head.


-- 
Met vriendelijke groeten, Ernst


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