Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Patent
1997-09-03
1998-12-15
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
058491490
ABSTRACT:
An improved process is disclosed for deinking waste paper which contains nonimpact printed papers printed with xerographic and laser inks by repulping the waste paper to form a slurry in the presence of an agglomeration agent and magnetite and subjecting the slurry to a magnetic field to remove the agglomerated ink particles, whereby the improvement comprises replacement of a portion of the agglomeration agent with a copolymer of styrene and acrylic monomers which copolymer is further characterized by having a Ring and Ball softening point of 70.degree.-105.degree. C. and an number average molecular weight of 2,000 to 10,000. The magnetic treatment preferably is conducted at ambient or greater temperature, at neutral to alkaline pH, and at a low pulp consistency. Also, the process may be employed as an additional step in a conventional process for removing inks from reprographic printed papers, such as ink removal by screening, flotation, centrifugal cleaning, washing, and sedimentation with or without decantation.
REFERENCES:
patent: 4820379 (1989-04-01), Darlington
patent: 5224604 (1993-07-01), Duczmal et al.
Hutter G. Frederick
Marwah Nipun
Lamb Brenda A.
McDaniel Terry B.
Reece IV Daniel B.
Schmalz Richard L.
Westvaco Corporation
LandOfFree
Magnetic deinking of waste papers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic deinking of waste papers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic deinking of waste papers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1454315