Re: Different photopolymer plates
First, congrats on the new press! Treat it well and it will last you a
lifetime. Also don't be hesitant about getting the blankets dry
cleaned when they need it. Sizing and other junk builds up on them
over time and can eventually cause quality problems.
KM83 are slightly thicker polymer (if I'm remembering correctly
KM43=43mils, KM73=73mils, KM83=83mils). KM73 provides slightly less
contrast due to the shallower depth you can get - KM83, more contrast.
I love the KM73, but the KM83 provides a stronger presence of ink (and
image) when exposed properly. The rule of thumb for proper exposure
for the KM83 is 25% greater than the KM73 - that's 25% greater on both
the screen and the image positive. KM43 was way too shallow for me to
want to bother with them after testing. All three plates are available
from Box Car Press. I usually buy in full case quantities of 20 (30x40
only come in qty of 10) and have the case shipped directly from Box
Car's supplier. Box Car has the best price I've been able to find on
Brian Pawlowski wrote:
For richer blacks I've been having great luck with the slightly thicker
KM83 polymer plates to get a deeper etch and omitting modifiers to the ink.
My Takach press will be on its way on Monday (you had given me some
advice on roller size etc...)
Are you noticing significant differences in exposure or processing
between various KM plates?
I am frankly curious. I inadvertantly ordered KM43 and KM73 plates from
two different sources. I noticed belatedly. In the absence of greater
insight I'm going to stick with KM73 plates...