Magnetic removal of "stickies" from waste papers

Details Magnetic removal of "stickies" from waste papers Magnetic removal of "stickies" from waste papers

1995-05-22

1997-06-17

Lamb, Brenda A.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 55, D21C 502

Patent

active

056393466

ABSTRACT:
An improved process is disclosed for removing "stickies" from waste paper which contains hot-melt and pressure-sensitive adhesives and lattices to produce high quality (high brightness, little to no dirt content) pulp with little or no fiber loss. The process involves attachment of sticky particles in the waste paper pulp to a magnetic carrier material with the help of an agglomeration agent followed by removal of the attached sticky particles by magnetic separation. The magnetic treatment preferably is conducted at ambient or greater temperature, at neutral to alkaline pH, and at a low pulp consistency. Agglomeration and magnetite addition, followed by exposure of the repulped waste paper to a magnetic field provides near complete sticky removal over exposure to the magnetic field without such pre-treatment.

REFERENCES:
patent: 4076578 (1978-02-01), Puddington et al.
patent: 5224604 (1993-07-01), Daczmal et al.

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