In the press running direction and side to side, after
the press has been ser for proper registration, trouble
arises when some condition prevents consistently good
|MISREGISTER IN THE PRESS RUNNING DIRECTION
|One or more pleats are cocked or are
not properly set on there cylinder.
||Plates should be handled more carefully
on bending jig.
|One or more pleats are printing longer
or shorter than the others.
||Transfer the packing from blanket to
plate to shorten the print, or from plate to blanket
to lengthen the print, of from plate to blanket to lengthen
the print. Maintain good tension on the web.
|Uneven blanket packing. If one of the
printing units is no pulling the web fast enough, web
tension between it and the following unit will built
- up until the web snaps back, causing misregister.
||Adjust blanket packing until the draws
between the suits are equal.
|Web tension is too low; the higher the
tension, the better the register
||Increase web tension in the infeed section
of the press.
| Web tension changes during run because
infeed tension changes.
||Equip presses with a constant - tension
|Ink at the point of impression is too
high causing the web to follow the blanket more than
normal. This momentarily increases the tension in localized
areas as a result can effect running register.
||Increase web tension. Reduce press speed.
Consult ink manufacturer for tack reduction of ink causing
|Paper pile on blanket changes blanket
|| Wash blanket more frequently. Change
to paper that is more moisture resistant.
|Paper roll out of round or having flat
||Constant - tension infeed will help.
Increase distance traveled by the web between infeed
and the first printing unit. Change to a roll that does
not have problem.
|MISREGISTER SIDE - TO - SIDE ( More
likely with wide webs 35+ inches):
| Non - uniform moisture across the web
causes corrugation of roll, resulting inside - to -
||Increase distance traveled by the web
between the infeed and the first printing unit. The
longer this distance and the higher the web tension,
the more uniform the web will be. Use a pre heater on
the infeed and the first printing unit to dry the paper,
even out the moisture content and flatten the web. Equip
press with a curved roller to spread and flatten the
|Welts caused by unwrapping rolls in
a high humidity area and allowing them to stand for
a long time. These welts will occur no more than 25
mils in to roll. The small amount of corrugation will
cause some side - to - side misregister just after splicing.
||Remove outer 25 miles of paper. Do not
unwrap rolls until just before going to press.
| Paper varies in calipaer across the
||Consult paper manufacturer.
|Web has slack edges due to moisture
pick - up while in the roll.
||Keep rolls from protected from atmospheric
changes until they are mounted on the infeed and the
web between the infeed stand. Increase distance traveled
by the web between the infeed and the first printing
unit in increase web tension, stretching the web tends
to tighten slack edges. Equip the press with a curved
roller on the infeed to spread and flatten the web.
Adjust the eccentric - mounted infeed roller to balance
|Ink track too high at point of impression.
Refer tip RUNNING DIRECTION MISREGISTER section of this
guide. #6 under cause.
||Refer to RUNNING DIRECTION MISREGISTER
section of this guide # 6 under solution.