9492Re: [PPLetterpress] Re: platemaking issues
- Mar 12, 2008Something new (something old & new) every day. Thanks, Eric.
My nuArc vacuum frame has a name plate but no model number, no bleed valve,
but a pressure gauge on the line. It has a glass top hinged within a metal
frame, with a vacuum area about 21.5 x 25.5. Not clear whether it ever had a
light attached -- it appears to have been part of a larger apparatus. The
vacuum space below the glass is sufficient to handle plate material, more than a
just contact prints.
Meanwhile, I do dust the plate material with powder to prevent it from
grabbing the negative. I don't think air bubbles are the cause of the exposure
irregularities I experienced. Uneven pressure on the plate and negative at the
edges of the plate (which I have assumed involves some slight bending of the
glass) seems the likely explanation. Mat board around the plate seems to solve
the problem completely. Whatever works!
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