U of S | Mailing List Archive | alt-photo-process-l | Re: Photopolymer Photo Gravure Press Questions

Re: Photopolymer Photo Gravure Press Questions

  • To: alt-photo-process-l@usask.ca
  • Subject: Re: Photopolymer Photo Gravure Press Questions
  • From: Jack Brubaker <jack@jackbrubaker.com>
  • Date: Wed, 16 Jul 2008 16:04:23 -0400
  • Comments: "alt-photo-process mailing list"
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The physics (or engineering) of press rollers is interesting. The
larger the diameter the more rigid the rollers will be but the smaller
the diameter the more pressure per square inch for a given total
tension between the two rollers (which is limited by the strength of
the press frame and ability of the press rollers to remain acceptably
straight when under pressure). So the same press frame could print
with more pressure with smaller diameter rollers, but other problems
can enter into the problem with small rollers, flexing of the rollers
and "creep" of the paper on the plate due to the angle of the roller
both pushing down and forward on the paper as the paper is compressed
by the motion of the roller across the plate. Paper creep is only a
serious problem if printing multi-plate color images (each time the
paper is rerun through the press the paper will be stretched a little
more throwing off registration). Like in everything else there is no
"right " answer, just a good compromise between strength and price. It
is always nice to have the heaviest press one can afford but many
people are pulling fine prints with 4 inch rollers. I knew a
printmaker who made his living selling prints (not teaching) who used
a little A B Dick table top press and pulled fine prints. You might
want to start with a small press and move up when you find a "bargain"
big press, it does happen.