ABSTRACT:
The objective of the study was
to determine what properties of
hot melt adhesives make them
more easily removable in
centrifugal cleaners. This
paper is a brief review of three
studies. The first was done at
the Jefferson Smurfit Technical
Center (JSC) and published in
T A P P I . The second, which is
detailed here, is a study done
at the Forest Products Lab (FPL)
and the third is work done at
Black Clawson (BC).
We prepared samples of hot melts
with different specific
gravities and added them
individually to pulp in known
amounts. Samples of feed and
accepts were taken and
handsheets were analyzed using
image analysis. The preliminary
indications are that both
particle size and specific
gravity play an important part
in removing hot melts in
centrifugal cleaners. This is
important in providing hot melt
suppliers with a goal of making
hot melts that are more
resistant to breaking up under
the shear of recycling. In
addition, production and use of
lower specific gravity hot melts
that are more efficiently
removed could also help the
recycling of these materials.
Finally, a process has been
developed that will help
evaluate centrifugal cleaners.
This can be used by vendors to evaluate their own products and
by users to help establish
performance and guarantees.
Hot Melt Adhesive Removal in Centrifugal Cleaners, 1993 Pulping Conference Proceedings