U of S | Mailing List Archive | alt-photo-process-l | Re: polymer plate drying time

Re: polymer plate drying time

More questions and responses below...

Keith Taylor wrote:

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,