Page 37 - Corru Jan- June20 final3

impression rolls. Any deviation here or the next operation. However, full When we’ve decided on an arrangement
may not be so noticeable when you utilization is more complex than or sheet size, how fast do we expect to
are only using the center portion of simply acting on what theoretically run? With that, what is the square footage
the rolls but when you are printing all CAN be done and instead involves that will be accomplished?
the way across, parallel matters! what the realities truly are.
l Diecutting large blanks means My advice: Someone looking only at a Cutting with the flute columns running
with the feed direction is more effective
a greater amount of cutting and spreadsheet should not decide what is the than running with the flutes across the
creasing inches of steel rule and a most productive way to run the machine. cylinder. Have we factored slower speeds
larger plane of rubber for ejection. due to part wrapping and stacker issues in
These two components result in So let’s get back to the real topic: How do we cases when the flutes are across?
greater forces to cut/crease/eject. measure performance of this machinery?
To overcome the forces, greater Factoring all of the options and results Measuring performance
penetration is applied. This tightening together, and then defining the planning
of the two opposing rolls reduces the protocol to address the new variables Machine efficiency is a final result of what
operational gap. More penetration presented against the historic data, will be the square footage yielded as a percentage
can cause machine wear, cutting die the best approach. The decision-making of the total machine opportunity minus
damage and part hang-ups. These criteria will be: the wasted time and material.
conditions are present at any speed What does the diecut and print look like? Machine opportunity number
and compounded as the RPMs are Lots of waste? Lots of angles? Rounded l Hours of operation
pushed up. corners? Big, small, perforated, light
l Stacking, folding, gluing and weight, heavy weight...??? l Max RPM
accumulating are the final steps l Max sheet size
of this process, and it is amazing If we want to go with a large sheet of What is deducted?
how technologies have embraced multiples, how well do they connect
the issues created by large, sail-like together to travel through the machine l Down time due to stoppage
sheets of corrugated going through a and then be separated? l Set up time
machine at jet speed, being chopped How will the part(s) most effectively l Quality rejection
into multiple pieces to then get travel through, get printed, diecut and
shuffled into nice, neat and clean then stacked? What is measured?
stacks of boxes ready for the truck l Actual sheet size delivered
l Run speed
l Total time to
complete order
l Value of the
individual parts
l Quantity of
parts produced
l Q u a l i t y
grade of the order
produced

From these measure
points, an honest and
fair assessment can be
made about the machine
performance.

In conclusion, when the
total performance of a
machine is considered
vs. the actual realities

The Corrugator | January - June 2020 35