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Machine translation
1. (WO1980000423) METHOD AND DEVICE FOR CLEANING SUSPENSION FIBRES
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/000423    International Application No.:    PCT/DE1979/000090
Publication Date: 20.03.1980 International Filing Date: 18.08.1979
IPC:
B03D 1/24 (2006.01), D21B 1/32 (2006.01), D21F 1/70 (2006.01)
Applicants:
Inventors:
Priority Data:
2836496 21.08.1978 DE
Title (EN) METHOD AND DEVICE FOR CLEANING SUSPENSION FIBRES
(FR) PROCEDE ET DISPOSITIF POUR NETTOYER LES FIBRES EN SUSPENSION
Abstract: front page image
(EN)A suspension of fibre material resulting from waste papers and charged with air bubbles is injected into a flottation cell (1) through injectors, the small air bubbles rising upwards through the suspension. The printing ink and other impurities are deposited on this bubbles and foam at the upper surface (6) of the suspension a foam layer. The foam lowded with impurities is sucked by means of such an nozzles (4). The fibres thus cleaned fall down towards the bottom. In order to reduce by at least one third the number of cells mounted in series to reach the same whiteness, the fibres cleaned previously come out through the exhaust (25) and renewed are injected into the flottation cell (1). As an alternative solution, instead of injecting a suspension of fibre materials charged with air bubbles, a suspension water/ air may be injected. The air bubbles thus renewed traverse in counter-current the fibres which fall down towards the bottom. In this way, an intensive contact air/fibres is provided.
(FR)Une suspension de matieres fibreuses provenant de vieux papiers et chargee de bulles d"air est injectee dans une cellule de flottation (1) a travers des injecteurs, les petites bulles d"air montant vers le haut a travers la suspension. L"encre d"imprimerie et autres souillures se deposent sur elles et forment, a la surface superieure (6) de la suspension, une couche de mousse. La mousse chargee d"impuretes est aspiree au moyen de tuyeres d"aspiration (4). Les fibres ainsi nettoyees tombent vers le fond. Dans le but de reduire d"au moins un tiers le nombre de cellules montees en serie pour atteindre le meme degre de blancheur, les fibres nettoyees prealablement sortent a travers l"echappement (25) et renouvelees sont injectees dans la cellule de flottation (1). Comme variante, on peut injecter, au lieu d"une suspension de matieres fibreuses chargee de bulles d"air, une suspension eau/air. Les bulles d"air ainsi renouvelees traversent, en contre-courant, les fibres qui tombent vers le fond. Par ce moyen, on cree un contact intensif air/fibres.
Designated States:
Publication Language: German (DE)
Filing Language: German (DE)