Re: Questions about platemakers...
Luis Nadeau (nadeaul@nbnet.nb.ca)
Sat, 3 Jun 1995 21:42:10 +0300
>Hi Adam,
>
>Whatthehell kind of fluorescent lights are you using to make your times
>so long? I have both a NuArc Mercury Vapor vacuum whatever you call it,
>cost now about $1700 plus shipping, and a bank of 7 blacklight
>fluorescents butted up
>against each other with the paper stage about 1 1/2 inches from the bulb
>surface. Times are EXACTLY the same. (Well, as near as I can measure. 100
>units on the NuArc takes about one minute and gives about the same
>exposure as one minute on the fluorescents.)
You should specify the process(es) you use.
My Berkey K&L metal halide requires about
20 seconds to 2 min. for Fresson printing and carbon transfer,
4 min. for palladium, and
10 to 12 min. for platinum.
I had to install a bleeding valve on the unit as "stress marks" appeared on
carbon transfers. The trick is to use just enough vacuum to obtain perfect
contact.
Luis Nadeau