- Dear David
Two considerations to be given to determining which plate
configuration to buy, are the height of the base and the kind of press
you are using. My two cents worth on this:
Generally on a hand-operated flatbed cylinder proof press or an iron
handpress where there is a greater control over inking (in terms of a
certain consistency with comparative sheeting and a seemingly greater
concern for ink transfer or splitting), a plate height between .037
.039" is all that is required. Relief depths here are generally at
.026". The shallower the relief depth the more image fidelity
improves, to what degree I couldn't say, but when you are trying to
coax out just a bit more perfection, these thousands of an inch begin
to matter. If you are running platens or motorized cylinder where ink
runoff is more of a problem and roller height is generally not as
closely monitored because of editioning concerns, the recommendation I
have been told is to go with a .060" plate height.
The three best known flatbases are the Boxcar Base, the Patmag, and
the Bunting Cerface.
The Boxcar Base is .874", with a allowance for the adhesive layer at
.004"; thus requiring a plate with a thickness of .039".
The Patmag is cut at a standard thickness of .858" and for a .038"
plate would require an underlay of .022".
The Bunting Cerface is cut with allowance to the height of the
specified plate thickness. Since Bunting does not recommend underlays
the consumer has to know exactly what plates they will be using. I run
.038" plates and have the Cerface ground to .88". There is a bit of
latitude. With this configuration I can also run .037" for halftone
work or .039" for solids.
Hope those individual numbers all add up to the correct totals!!! And
if I'm in error on any of this I would surely appreciate correction.
Also hope this helps and isn't all the more confusing.
- Thanks very much Gerald. All this stuff is very helpful.
> From: "Gerald Lange" <bieler@...>
> Reply-To: PPLetterpress@yahoogroups.com
> Date: Tue, 28 Aug 2001 05:25:55 -0000
> To: PPLetterpress@yahoogroups.com
> Subject: [PPLetterpress] plate configurations
> Dear David
> Two considerations to be given to determining which plate
> configuration to buy, are the height of the base and the kind of press
> you are using. My two cents worth on this: