Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With plural or specified mechanical defibering step
Patent
1990-11-28
1993-09-14
Dang, Thi
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With plural or specified mechanical defibering step
162 56, 162125, 162129, 162132, D21C 900
Patent
active
052445410
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.
REFERENCES:
patent: 2516384 (1950-06-01), Hill et al.
patent: 3382140 (1968-09-01), Henderson et al.
patent: 4036679 (1977-07-01), Back et al.
patent: 4773965 (1988-07-01), Glinski et al.
patent: 4976819 (1990-12-01), Minton
Dang Thi
Potlatch Corporation
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