Re: polymer plate drying time
Oh Susan (O'Flaherty O'Daly),
Yes, I have been getting the same dark patterns if I don't use baby
powder or spray and maintain a long drawdown time (image only, not
screen). I'm building a little drying box today and will be at the
studio this afternoon to see if that helps more.
On 3/17/2007, "SusanV" <firstname.lastname@example.org> wrote:
>Jon and Keith,
>Thanks for this discussion. Lots of helpful information.
>I rigged a striplight under my exposure head so that now I can really
>watch the positive as it gets sucked down against the plate. What I
>see are lots of little irregular shaped areas that move and change
>shape, and they're colors are rainbow-like and change... I think it's
>a Newton's rings kind of thing. (and no I haven't been smoking
>anything :P ) The shapes are larger in the beginning, then get
>smaller but more numerous as the vacuum continues. This is SO hard to
>describe, haha. Do you all see anything like that happening?
>I'm snowed in here and happy as a clam to be heading to my studio for
>a day of printing! Will definitely be drying my OHP now. I'm going
>to find one of those bonnet hairdryers this week and try out using it
>to rig a drying box.
>Happy St Patrick's Day!!!
>Susan O'Flaherty O'Daly (my real family names 2 generations back :o) )
>On 3/17/07, Jon Lybrook <email@example.com> wrote:
>> More questions and responses below...
>> Keith Taylor wrote:
>> > Jon,
>> > I remove the Mylar and dust with talc (screen and positive).
>> Do you use actual talc, or baby powder? I've found that real talcum
>> powder is difficult to find - though I used some in Florence. Much more
>> chalky and coarse than baby powder -- at least the batch I had access to.
>> > I have a 33x43" vacuum frame with glass, get 22in Hg and I leave it
>> > for at least 3 minutes before exposure. I have a ribbed bed to the
>> > frame which causes problems with platinum prints, so I have a sheet of
>> > black plastic 1/32" thick.
>> The Kreene makes it so I can only get about 12 in the vacuum frame.
>> Images are generally pretty sharp except for the patches though.
>> > You use an anti-static spray regularly don't you?
>> Yes, due to the Kreene plastic.
>> > I clean the glass with a non-ammonia, non-alcohol based cleaner, but
>> > no anti-static spray. I also use Pictorico on a roll (never sheets)
>> > with an Epson 4000. I do have a 2200 that I use infrequently with
>> > sheet Pictorico, but not for gravure - usually small platinums.
>> > I dry the OHP in the film drying cabinet for 20-30mins low heat prior
>> > to use.
>> Drying the OHP seems to be the biggest difference, since I used to have
>> glass in my vacuum frame, and do basically everything similarly to
>> you....but I've never bothered to try drying the OHP with heat for 20-30
>> minutes. I did use to dry my plates with a hair drier until I was told
>> by an instructor that it was a waste of electricity...NOT.
>> > I'm just throwing out things here that you may recognise as being
>> > different from your setup.
>> Thanks Keith. I'm very eager to dry some OHP and try dusting again,
>> both the plate and positive and will report back.
>> Best regards,
>gravure blog at www.susanvossgravures.blogspot.com