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Re: PPWeirdness (dampening follow up)

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  • Gerald Lange
    Peter Don t know that the other concern was in reference to you, but you might even want to back down to 4 minutes on washout for the Toyobo 152s. It ll leave
    Message 1 of 23 , May 9, 2008
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      Don't know that the other concern was in reference to you, but you
      might even want to back down to 4 minutes on washout for the Toyobo
      152s. It 'll leave a bit of residue and not look as nice as one might
      hope, but it will definitely prevent undercutting and ensure support.
      These are steel-backs. Don't know about the polyester-backed 152s.

      The Toybobo 95s are a dream plate. Perfectly clean at 3.5 minute
      washout, no residue, no undercutting, steel- or polyester-backed.


      --- In PPLetterpress@yahoogroups.com, Peter Fraterdeus <peterf@...> wrote:
      > Bryan, Gerald,
      > Dampening worked well on the 300gsm Lettra
      > Assuming one is doing single color work, variation in grain doesn't
      > really come into it.
      > Also, even with multiple colors, keeping the stock lightly wrapped
      > between impressions will minimize dimensional variation.
      > Double ply, 600gsm, I can imagine may be a problem on the cylinder,
      > yes...
      > As far as the other concern that Gerald alludes to, the plate in
      > question was neither of the Toyobos, but a leftover that was acquired
      > previously. I've had none of these problems with the Toyobo 152. One
      > thing is that I've found that keeping the washout to the absolute
      > minimum is critical, and often pull the plate while there are still
      > small amounts of material adhering to the backing. (about 4.5 minutes)
      > With this, I get lovely shoulders on even isolated thin rules and
      > dots...
      > My concern had nothing to do with "bulging" between the letters, but
      > the fact that there was so little definition between the letters, so
      > that the whole line of type appeared to be surrounded by a slight
      > depression caused by very shallow shoulders. With the Toyobo (either
      > 95 or 152) I've not had this problem. While the impression was not
      > wimpy, neither was it excessive. There is never embossing on the verso.
      > Cheers
      > P
      > On 8 May 2008, at 6:43 PM, kringds wrote:
      > > Hi Gerald,
      > >
      > > I was browsing the archives on dampening paper and came across your
      > > post below in
      > > which you seem suprised at the dampening of Lettra. Could you tell
      > > me why you were
      > > supprised?
      > >
      > > I am getting ready to print a job on 32# lettra and am debating if I
      > > should dampen the
      > > paper. I will be printing on polymer plates with primarily line art
      > > with black ink.
      > >
      > > I have dampened heavier weight paper before with good results but I
      > > am wondering if it
      > > makes sense for a lighter weight paper. I assume it does. Could you
      > > or anyone with
      > > experience let me know their opinion on this?
      > >
      > > As always, thanks for the help and advice.
      > >
      > > bryan kring
      > Peter Fraterdeus
      > Exquisite Letterpress
      > http://slowprint.com
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