- Jun 3, 2005Jessica
94FLs are a tad softer than other plates, don't know if this is the culprit or not. I'd recommend a hardness rating of 65-70 Shore D minimum. You might also think about switching to a higher grade plate brand.
--- In PPLetterpress@yahoogroups.com, Jessica Spring <springtide@i...>
> Tom & Gerald--The last
> The plates are 94FL. I do have the steel bar at the bottom, so I can try
> taking that off, and for comparison I can try a steel-backed plate.
> bit of the mystery: my vacuum has a simple on-off switch and halfthe time
> the button won't stay on. I've replaced the button itself, but theproblem
> remains, which Jet attributes to humidity. Hmmmm. I have to let itsort of
> warm up, then it stays on. As Charles suggested, I think the vacuum is athat in
> stinker (AKA "wildly out of whack") and this plate happens to reveal
> a way I hadn't seen consistently with type.
> > From: "Gerald Lange" <bieler@w...>
> > Reply-To: PPLetterpress@yahoogroups.com
> > Date: Fri, 03 Jun 2005 06:02:55 -0000
> > To: PPLetterpress@yahoogroups.com
> > Subject: [PPLetterpress] Re: troubleshooting
> > Tom
> > Interesting speculation but I doubt the vacuum is such, in any of
> > these machines, to be able to pull a polyester-backed plate into the
> > vacuum line. That would sort of be a major engineering flaw. I process
> > both steel-backed and polyester-backed plates in my machine and I
> > can't imagine this to be the case. While polyester-backed plates are
> > certainly flexible (and a bit unnerving to those accustomed to
> > steel-backs), they are not flexible enough to be drawn down into that
> > thinly etched vacuum line, unless there is something wildly out of
> > wack with Jessica's vacuum pump!
> > Gerald
> > --- In PPLetterpress@yahoogroups.com, typetom@a... wrote:
> >> In PPLetterpress@yahoogroups.com, Jessica Spring wrote:
> >>> there is now a subtle but visible "plaid" where the vacuum lines
> > produced
> >> more suction.
> >> I'm guessing you are using polyester-backed plates and the vacuum
> > is sucking
> >> hard enough to distort the contact between the plate and the
> > negative, by
> >> pulling the polyester material into the vacuum lines. I use
> > steel-backed
> >> plates. Never seen any such effect. I wonder if a thin support
> > layer beneath the
> >> plate material might solve the problem?
> >> Pure speculation! but I'd guess it's such a subtle effect that it
> > wouldn't
> >> show on normal text or image areas. You wouldn't notice the plaid if
> > the lines
> >> had other irregular variations already! A solid pattern with thin
> > rules
> >> would test the limits of the system just about every way possible!
> >> Best wishes. Let us know what you discover....
> >> Tom
> >> Tom Parson
> >> Now It's Up To You Publications
> >> 157 S. Logan, Denver CO 80209
> >> (303) 777-8951
> >> http://members.aol.com/typetom
> >> [Non-text portions of this message have been removed]
> > Yahoo! Groups Links
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