Die Performance
How to get more performance out of your die - by putting the right
die ejection material in.
For about as long as most of us can remember, the "rule
of thumb" has been the determining test of the ejection material.
Pick up a piece of sponge, squeeze it between your thumb and index
finger, and decide "that's about right," or "need
something a little firmer (or softer)." Essentially, there's
nothing wrong with this rule, as far as it goes; a skilled die
maker's experienced fingers can tell a lot about the die ejection
material chosen for a particular application. But there is a more
precise way to gauge die ejection material.
Industry experience and our own research point to some improvements.
Your User's Guide combines the best industry know-how with findings
from our own research lab. The results give you more accurate
ways to measure and select the right die ejection material for
virtually any application. We'll also be happy to discuss your
needs personally, and recommend a material selection process that
best meets your needs. Now you can combine the "rule of thumb"
with proven material research findings to make choosing a die
ejection material more consistent, and more effective. And the
results can carry through all the way to your bottomline profits.
Improving press or die cutting speeds and reducing make ready times
is related to three factors:
1. Choosing the best ejector grade and ejector thickness for
the job.
2. Using more than one grade ejector on the die.
3. Proper ejector placement on the die.
Choosing the best ejector for part ejection is dependent
on the amount of compression the ejector receives. Use our interactive
Rubber Selector tab within this website for help in choosing the
best ejector grade and thickness.
Using more than one grade ejector on the die is necessary
because different areas of the die require different amounts of
ejection force in order to eject rapidly. Therefore the die should
be rubbered accordingly. Tightly ruled areas or slot areas like
between parts require more force to eject. Therefore they should
have a firmer grade (firmer than the grade used for part ejection)
used in those areas. Green G’rilla, BK-85, or SuperStrip
are ejectors designed for this very purpose and are available
in a variety of cuts (E-Z-Set, Sidewave, Ejectoflex, Groovy G’rilla)
ready to use. Nicks placed in the cutting rule to keep part and
web together also need to be supported on both sides of the rule
with a dense material like Green G’rilla, BK-85, or SuperStrip.
The E-Z-Set cut is recommended for this job. Any of these materials
used in this way will clamp and hold the substrate to prevent
tab breakage due to the natural wedging action of the rule during
diecutting.
Proper ejector placement on the die is required to ensures
that the ejectors can work rapidly without any drag. Ejectors
should be placed away from the cutting rule. The offset distance
for cutting rule, while subject to the rubber volume area, should
be about 1/16" for best results. Keep the ejectors about
3/16" (subject to the creasing Matrix used) away from creasing
rule. To help with this and make rubbering of the die quicker
and easier, we have products like E-Z-Set, Sidewave, and Ejectoflex
that have a built in offset.
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| MRP Side-Wave Ejectors |
MRP Ejectoflex™ Ejectors |
MRP E-Z Set™ |
