Digital BW, The Print

----- Original Message -----
From: "Ernst Dinkla" <E.Dinkla@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Tuesday, September 24, 2002 9:55 AM
Subject: Re: [Digital BW] re coating


>
> ----- Original Message -----
> From: "Robert Morrison" <rmorrison@...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Tuesday, September 24, 2002 1:01 AM
> Subject: Re: [Digital BW] re coating
>
>
> > On 9/23/02 1:35 PM, "Bruce" <smthopr@...> wrote:
> > > has anyone tried using a silk screen squeegee, but without the screen?
> > >
> > > -Bruce
> > >
> > Doesn't work.  Screens produce enormous shear resulting in a major
foaming
> > problem with thin liquids.  You have to use a thick body product or a
lot
> of
> > antifoam to get rid of the foam...this requires formulating the likely
> > polymers for a method of application much different than what they were
> made
> > for...or risking the poor film qualities of polymers dosed with
anti-foam.
>
Correct, but depends on the speed of printing, the mesh and the number of
prints.

A squeegee on its own is unusable.

Something has to be added: inks with water, alcohol or glycol as the
solvents are much more prone to foaming than the usual solvents or no
solvent as in UV curable inks.. The addition of antifoaming agents is 1%
weight at most, I have not seen problems as a result of that. And it is
possible to print large prints in silkscreen something I see not possible
with a rod. A3 will be no problem with the last though. I guess a vacuum
tabletop will be nice for keeping the paper flat when using a rod
applicator.

Ernst