B - Operations – Transporting – 02 – C
Patent
B - Operations, Transporting
02
C
B02C 23/18 (2006.01) B02C 23/08 (2006.01) D21B 1/32 (2006.01) D21D 5/02 (2006.01)
Patent
CA 2274027
A system and method for treating a waxed fiber paper product with a high wax content to remove a substantial portion of the wax content includes the pulping of the wax paper fiber at an elevated temperature in excess of the melting temperature of the wax to separate a pulp fraction and to form an emulsion of water and molten wax. The pulp fraction is separated from the emulsion by filtering in a reverse pressure screen (30) in which a finely perforated screen (45) defines a high pressure side and a low pressure side, and a major portion of the water/emulsion is removed from the suspension through the screen perforations (45) leading from the high pressure side to the low pressure side in which a rotor and foil arrangement (50, 52) within the reverse screen (30) is operated under such conditions that the suspension at the high pressure side of the screen (30) is maintained in a constant fluidized condition.
L'invention a trait à un dispositif et au procédé correspondant permettant de traiter du papier de fibres ciré à forte teneur en cire et ce, afin d'enlever une quantité importante de cire. Ce procédé consiste à réduire en pâte ce papier ciré à une température élevée supérieure au point de fusion de la cire afin de produire une fraction pâte séparée et de former une émulsion d'eau et de cire fondue. On sépare ensuite la pâte de l'émulsion par filtration au moyen d'un épurateur en cascade sous pression (30) dans lequel un écran à fines perforations (45) délimite un coté haute pression ainsi qu'un coté basse pression, la majeure partie de l'eau/émulsion étant extraite de la suspension grâce aux perforations de l'épurateur (45) conduisant du coté haute pression vers le coté basse pression. Un agencement rotor et racle (50, 52), situé dans l'épurateur en cascade (30), opère dans des conditions telles que la suspension du coté haute pression de l'épurateur (30) est maintenue à l'état fluide.
Locke Ralph E.
Prentice Gary N.
Vitori Christopher M.
Gowling Lafleur Henderson Llp
Inland Paperboard And Packaging Inc.
Thermo Black Clawson Inc.
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