Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Chemical treatment after start or completion of mechanical...
Reexamination Certificate
2000-03-07
2010-06-15
Halpern, Mark (Department: 1791)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Chemical treatment after start or completion of mechanical...
C162S025000, C162S026000, C162S028000, C162S055000, C162S065000, C162S068000
Reexamination Certificate
active
07736463
ABSTRACT:
A method of manufacturing bleached mechanical and chemithermomechanical pulp is provided, having enhanced bleaching effect, wherein lignocellulose material is passed through at least one preheater or through a chemical treatment system, a steam separator and a refiner where the lignocellulose material is converted into a pulp suspension which, after steam separation, is passed at least to a storage vessel and to a screening department, from which the major part of the pulp suspension is separated as a substantially finished product or is separated and further treated. The reductive bleaching agent is added to the advancing pulp suspension without a bleaching tower. The method is characterized by adding the bleaching agent at a location downstream of the refiner and upstream of the screening department, and by bleaching the pulp under drastic conditions of temperature and minimized oxygen access at the location and immediately downstream of the location.
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Webster's Third New International Dictionary, Unabridged, 1993, Merriam-Webster, Incorporated.
Smook, G.A., Handbook for Pulp & Paper Technologists, TAPPI, 1982, pp. 161, 171.
Axelfelt Micael
Bengtsson Sverker
Magnusson Johanna
Stahl Charlotte Wancke
Zhang Eric Yijing
Halpern Mark
Holmen Aktiebolag
Sughrue & Mion, PLLC
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