Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With classifying – separating or screening of pulp
Patent
1991-08-13
1993-03-09
Hastings, Karen M.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With classifying, separating or screening of pulp
162 4, 209211, 210197, 2105121, 210787, B04C 514, B04C 900, D21D 524
Patent
active
051923971
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and an apparatus for cleaning of a pulp suspension from heavy as well as light contaminate particles, and the cleaned suspension is accepted without any fiber losses.
The object of the present invention is to provide a method and an apparatus by which is maintained a high cleaning efficiency of a pulp suspension with respect of both heavy and light contaminate particles. The distinguishing features characterizing the invention are described herein.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in detail with reference to the accompanying drawings, in which
FIG. 1 schematically illustrates in a side view and partly in a cross section a preferred embodiment of a fiber reclaimer according to the present invention and with respect to a separation of heavy contaminate particles,
FIG. 2 schematically illustrates in a side view and partly in a cross section an embodiment of a fiber reclaimer according to the present invention and with respect to a separation of light contaminate particles such as polymer and adhesive substances (stickies).
DETAILED DESCRIPTION
Referring to FIG. 1 the fiber reclaimer according to the present invention consists of a connection arrangement including a cone 1 which is terminating in a conical housing 2, a suction pipe 3, vessels 4,5 and at least one connection pipe 6 if there are at least two vessels 4,5. A cyclone not illustrated in the drawings is with its lower cone and flange connected to the cone 1 with its flange 7.
A fibre or pulp suspension which is to be cleaned is injected tangentially through an inlet of the cyclone with a determined pressure. In the cyclone the suspension is divided into accept (cleaner suspension) and into reject (suspension uncleaned with heavy and even light contaminate particles). With known technics of today it is almost impossible to recycle and save all fibres from cleaning operations and therefore some fibres get into the sea. According to the present invention all fibres are to the contrary recycled and saved e.g. in the last stage of a cleaner installation.
The cleaning or separation according to the method of the present invention is achieved by pressing the reject through the cone 1 and against and through its outlet 13 having a diameter d. After that the reject is expanding in the conical housing 2 and flows into the vessel 4 through an opening gap 17 between the vessel 4 and the suction pipe 3. In the vessels 4,5, the height H of which determines the time of delay in the fiber reclaimer, the heavy contaminate particles are separated (e.g. sand from the suspension). The pulp suspension is filling up the vessel 5 through the connecting pipe 6 and get in this way a further opportunity to be free from fine sand. Heavy contaminate particles are sinking to the bottom of the vessels and where they can be emptied manually or automatically.
When the suspension flows into the vessel 4 through th opening gap 17 a vacuum zone is created between the diameter d of the cone 1 and an opening end 16 having a diameter D resulting in that all suspension which reaches the level of a second tail end 18 of the suction pipe 3, will be resucked through the cone 1 into the cyclone. The importance of the diameter of the cone 1 of the outlet 13 and of the diameter D of the suction pipe 3 of the opening end 16 is as follows. For cyclones or cleaners with low capacity e.g. 100 l/min it is characteristic that the outlet diameter d of the cone 1 is small (e.g. some mm). The opening end or mouth 16 of the suction pipe 3 may not be of the same order of magnitude or size because the suction pipe 3 is more susceptible to be plugged up with fibres than the outlet 13 of the cone 1 having the diameter d.
The diameter D of the suction pipe 3 of the opening end 16 must be much greater than the diameter d when d is small. Only when the diameter d of the cone 1 reaches about 30-40 mm the diameter D also can reach to 40 mm. When using large dimensions of d, the diameter D can be smaller than the diameter d and th
REFERENCES:
patent: 3259246 (1966-07-01), Stavenger
patent: 3529724 (1970-09-01), Maciola et al.
Hastings Karen M.
Kolman Milan
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