Pulp treatment methods
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United States of America Patent
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Sep 14, 1993
Issued Date -
N/A
app pub date -
Nov 28, 1990
filing date -
Apr 28, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of processing pulp comprises the following steps of a) mechanically refining pulp of up to 50% O.D. consistency; and b) mechanically treating the mechanically refined pulp by wringing, dewatering and compacting the mechanically refined pulp to permanently twist and kink individual fibers to a degree that is substantially irreversible when they are subsequently subjected to papermaking process steps, the refined and treated pulp having increased bulk and no reduction in Z-directional tensile over the same pulp that has not been mechanically refined and thereafter wrung, dewatered and compacted to twist and kink individual fibers. Alternately, the order of mechanically refining and mechanically treating can be reversed. The invention may have specific application to enhancing multi-layer paper products where pulp treated in accordance with the invention is utilized as core ply pulp in a multi-layer paper product. Treated pulp when made into a sheet also exhibits reduced wicking which may provide specific applicability in paperboard products which are used for containment of liquids.
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