411Re: [PPLetterpress] Kreene?
- Mar 3, 2002Wayne -
I once had a home made exposure system and then later a used machine from
Anderson & Vreeland. The kreene on the A&V machine covered all the holes in
the metal vacuum base. The suction of the pump was so strong there was no
need for any other seal - about 25 psi as I recall. It created a very tight
bond. The kreene was taped to the base at one end and to a metal rod at the
other (kreene tightly rolled up) end. the neg/plate was positioned on the
bed, the vacuum turned on, and the kreene rolled out over the base. The
suction took hold progressively and the weight of the rod (hanging over the
front edge of the base) completed the arrangement.
My home made system was of plywood base, 1x1 inch spacers around the edge,
and pegboard top, screwed together and sealed with silicone rubber. An
opening was left in the 1x1 space for the "edging" tool of a hand held Dust
Devil type vacuum cleaner. The suction of that was actually too much, bowing
the pegboard, so I opened up some holes of the pegboard. I used clear
acetate to hold the neg/plate (this was before I knew of the kreene), and
the static charge it created was awful, bad plates resulting from dust
covering serifs, etc.
In both cases the lighting was a closely spaced set of fluorescent bulbs,
about 2 inches above the exposure frame.
Hope this helps - I'd be happy to answer further questions.
Mountain View, California
on 3/3/02 4:39 PM, cutncrease at wayne@... wrote:
> I've just built myself a neat little A3 exposure unit (8XSylania 350BLs which_________________________________________________________
> sit 2 inches above the plate) I'm now attempting the vacuum frame. I've
> seen much info about using kreene or pvc instead of glass (which I understand
> absorbs important UVA). Just wondering if anyone could explain how the
> kreene is sealed around a vacuum blanket and frame in order to create good
> contact between plate and film. Should I be looking at some kind of
> snaplock system (like in a vacuum bagging process) or does the sheet of kreene
> go under a sheet of pvc which is hinged to the frame in a standard
> manner. Should I be using kreene in a fluro exposure system or is it for
> single point light sources only? Any help would be much appreciated.
> Many thanks,
> Wayne Davis
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