PARALIGN in the wet end0 pages

PARALIGN® in the wet end

The lower press felt in the wet end of a paper
mill producing newsprint paper showed a remarkable shrinking after only two weeks of production: Both lateral edges reduced the width of
the felt, thus the lifetime of the felt decreased
dramatically. After two weeks of production it
had to be replaced. Usually the lifetime should
be five weeks. In addition to the increased spare
costs the production department suffered from
further machine downtimes.
On the picture to the right the compact structure
of the wet end can be seen clearly. In this multi
layer environment an optical system can only be
used under a huge loss of time and accuracy
caused by the additionally needed measurement
equipment like mirrors and prisms.
Here PARALIGN® was able to convince production management by its incomparably
brief measurement time and its self explaining
measurement protocol. Another advantage:
PARALIGN® does not need any line of sight
between the rolls themselves or between the
rolls and the outer reference line. Thus all rolls
could be measured without a loss of accuracy.
After measuring the alignment condition, the
found offsets were corrected according to the
immediately available PARALIGN® protocol.

Flawless forming?

LEVALIGN®
Flatness measurement with the better partner.
Contact us for further information.

The lower press roll was chosen as reference
roll. The corrections were proved on the same
day by a second PARALIGN® measurement.
After the corrections the lower press felt could
keep its planned lifetime as the shrinking effect
did not occur any more.
The next page shows the PARALIGN® protocols
of the discussed wet end before and after the
corrections. The improvement in roll parallelism
can be seen clearly.

Advantages of PARALIGN® in the wet end
Longer lifetime of consumables:
wires, felts, roll covers
Higher machine availability

reduction in paper breaks
rare replacement of parts results in reduced stoppages
Increased quality

decrease in folds
uniform moisture profile
less waste
www.pruftechnik.com