as mentioned, the bubble thermal jet has to heat the
ink to form a bubble(vapor bubble) whitch forces the
ink out the orfice. lots of stuff dont like the heat
and will dry up in your print head. a piezo uses a
crystal that swells when an electrial postive voltage
is applyed, then contracts when an negative voltage is
applyed, so you have a pumping action with the piezo
head with no heat. BUUUUT, the ink has to be the right
consistancy or it will not go through the ink
channels, or if to thin will flatten and spread when
the ink hits the pcb. as far as impact printing, the
head has either 9 or 24 pins that move out to strike
the ribbon and paper leaving the ink that is in the
ribbon on the paper. BUUUUT on impact you need a
straight through feed so the pcb will go through.
thermal impact printers use a heat sensitive paper,
when heated the paper turns black so when the hot
printer head pin hits the paper it leaves a blackened
dot on the paper. on this type you need straight
through feed also.one might coat some paper with
something that will melt and stay on the pcb, with the
paper taped over the pcb. among the four types of
printers there should be a etch resistance
substance(that will not wash off with water) that can
be transfered to the pcb. the big problem is finding
the right substance or mixed substances that will work
with one of the four types of printers.
mebo
--- Phil <
phil1960us@...> wrote:
> I'm pretty ignorant on inkjet technology. why wont
> a bubble jet
> work?
>
> --- In Homebrew_PCBs@yahoogroups.com, pebo festus
> <mebo31@y...> wrote:
> > oh yes phil. i am still working on getting an ink
> jet
> > to print on a pcb. will try every thing from bees
> wax
> > to beer, dont think a bubble jet(thermal) will
> work,
> > am working on trying a piezo print head now. if
> this
> > doesn work with all i can think of i will try an
> > impact printer if i can find a cheap one with flat
> bed
> > feed. will try to put some thing on the ribbon to
> > transfer to pcb.i have a cheap(small) thermal
> impact
> > printer coming,will try that maybe along the
> corbon
> > paper line, or coat paper with something to
> transfer
> > to pcb.
> > there has to be a (easier)better way than ironing.
> > mebo
> >
> >
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