Re: My own PVA glue sizing experience (attn: marek + the gum woesagain)

[phritz phantom <phritz-phantom@web.de>]

ah,
two more things i forgot to add.:
i've noticed that the strength of the pva-size affects the thickness of 
the emulsion layer. with a 1+4 size the emulsion is noticeably thinner 
than the same emulsion on a 1+20 size. most likely because with the 
thinner size, there are more paper fibers for the emulsion to adhere to.
and the caparol binder size on (unprimed) canvas didn't work at all. not 
even the brightest highlights came off.
caparol 1+4 on primed canvas and wood (a layer of white acrylic primer 
beneath) did print fine, but the exposed gum had nothing to adhere to 
and washed off completely. the situation was a little better on the 
canvas than on the wood.
maybe this is interesting to someone.

phritz




phritz phantom schrieb:
> loris,
> that's why i asked you if you could check for the adherence. thanks 
> for that btw.
> i will order some of the gamblin next week, to try next.
>
> i know the strips aren't good, but if the conditions stay like in the 
> second example (the stainfree one on caparol i just sent again), 
> that's something i can work with and improve. btw there is also no 
> curve applied at all, so it's supposed to be detail in only two or 
> three lines of the scale. if the outcome is stained and/or inversed 
> like that, there is no real point to trying to make fine adjustments.
> you'd have to take my word for that, but the conditions of the two 
> test strips were identical (at least concening ingredients and 
> workflow and as far as i can tell). this sounds pretty stupid, but the 
> last time i got the stain (two weeks ago), it was rainy weather 
> outside and yesterday it was rainy again. so maybe it really has 
> something to do with humidity...
>
> phritz
>
>
>
> Loris Medici schrieb:
> > Hi Phritz, my PVAc glue is a Caparol product too. Just a different
> > type of PVAc (and/or different formulation)...
> >
> > As I said before, PVAc glue/sizing is a very vague description;
> > molecular weight, hydrolization ratio, solution strength and extra
> > additives all are definitive. And unfortunately no manufacturer is
> > stating these (= the exact formulation) in their product information
> > sheets.
> >
> > Try another one if this is not working for you.
> >
> > I must insist something's wrong with your coating solutions; none of
> > your posted step tablet prints were successful in my criteria...
> >
> > Regards,
> > Loris.
> >
> >
> > 2009/10/23 phritz phantom <phritz-phantom@web.de>:
> >  
> > > ...
> > > it's good to hear that your pva works better than the caparol. so 
> > > there is
> > > hope with the substance.
> > > ...
> > >     
> >