Multiflow pressurized deinking apparatus

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 1/70 (2006.01) B03B 13/00 (2006.01) B03D 1/14 (2006.01) D21B 1/32 (2006.01)

Patent

CA 2286292

A mixture of air and paper stock (36) made from recycled paper from which the ink particles have been chemically released is injected into a cylindrical processing vessel (22). Added surfactants create a foam (40) from the air as it rises through the stock (36) and cause the ink particles to adhere to the air bubbles, resulting in a foam containing a concentrated fraction of the ink particles with some included fibres. The foam rises to the top (43) of the vessel (22), and carries with it ink particles. Additional air injection ports (53) can be used to increase the amount of foam generated and the amount of ink removed. Flow of stock (36) and foam (42) from the vessel (22) can be controlled by adjusting valves (70) on the stock (34) and foam outlets (44, 56). Flotation sensors (60) allow the foam head to be maintained at the stock level by controlling the rate at which foam (42) is withdrawn through the foam outlets (44, 56).

L'invention concerne un mélange d'air et de pâte (36) obtenu à partir du papier recyclé à partir duquel les particules d'encre ont été chimiquement enlevées et injecté dans un bac (22) cylindrique de traitement. Les tensioactifs ajoutés créent une mousse (40) à partir de l'air, lorsque ce dernier remonte dans la pâte (36) et provoque l'adhésion des particules d'encre aux bulles d'air, ce qui entraîne la formation d'une mousse contenant une fraction concentrée de particules d'encre contenant quelques fibres. La mousse monte jusqu'à la partie supérieure (43) du bac (22) et transporte avec elle des particules d'encre. Des orifices (53) d'injection d'air supplémentaires peuvent être utilisés pour augmenter la quantité de mousse générée et la quantité d'encre enlevée. On peut réguler l'écoulement de la pâte (36) et de la mousse (42) à partir du récipient (22) en réglant les vannes (70) sur la pâte (34) et les sorties (44, 56) de mousse. Des détecteurs (60) de flottation permettent de maintenir la surface de mousse au niveau de la pâte au moyen de la régulation du débit (42) auquel la mousse est extraite à travers les sorties (44, 56) de mousse.

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