Agitating – Having specified feed means – Agitation of material in feeder or supply reservoir
Patent
1996-02-15
1998-03-10
Cooley, Charles E.
Agitating
Having specified feed means
Agitation of material in feeder or supply reservoir
3661722, 366304, 2412612, B01F 504, B01F 1502
Patent
active
057253064
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention refers to a mixer, particularly a high-efficiency mixer for fluffing shredded pulps and mixing them with treatment substances and/or additives, particularly bleaching chemicals. Such a mixer contains an annular mixing and fluffing zone, located between a disc rotor and an annular stator, and a central material feed channel in which a positive conveyor is located for conveying purposes.
Mixers are described in, for example, AT-PS 388 193 and show a material feed channel in the form of a vertical chute, where the annular mixing and fluffing zone is located accordingly on a horizontal plane and the treated material is carried off to the side. The throughput of these mixers is limited because the diameter: of the chute cannot be selected at will.
Also described in CH-PS 485 479 is a device for creating dispersions or solutions from a liquid component and a solid or pasty component using a mixing apparatus. To achieve this the solid or pasty component is fed to the mixing apparatus through a conveying screw which ends directly in front or the rotor of the mixing apparatus and the liquid component is discharged from a feed pipe at the end of the conveying screw. If this configuration is used to mix fibrous pulps with treatment substances, e.g. bleaching chemicals, the result would be Inadequate conveying, on the one hand, since the material does not fill the conveying screw, and on the other hand uneven penetration of the fibrous pulps on the other hand.
SUMMARY OF THE INVENTION
The invention, the positive conveyor is configured as a ribbon feeder. In one embodiment, a baffle, in particular a baffle shaped like the envelope of a cone, that is firmly connected to the shaft of the ribbon feeder, with associated treatment discharge holes, at the end of the shaft of the ribbon feeder. Alternatively, a double casing defining a treatment fluid flow path is provided round the ribbon feeder. Thus, the ring of fibrous pulp forming around the circumference of the pulp feed channel can be guided particularly well, and any treatment substances, particularly bleaching chemicals, in liquid or gaseous form, are evenly distributed in the vicinity of the mixing and fluffing zone.
This design also permits the possibility of a plant with a horizontal material feed channel and appropriate vertical arrangement or the mixing and fluffing zone in which the rotor and stator are mounted at right angles to the horizontal. A slanting arrangement is thus also possible.
In those mixer designs already known, additives, particularly bleaching chemicals, are dosed into the chute, for example, where problems can occur with even distribution of the additives through the material, particularly if liquid additives are used. In the case of pulp, it is well known that its high capacity for adsorption makes liquid additives difficult to distribute if the pulp is not saturated. In addition, there is also the problem of non-uniform retention time and uneven reaction process since the aim is that the additives (only) take their full effect in the mixing and fluffing zone sector.
Positioning a positive conveyor in the feed channel according to this invention, opens up the possibility of feeding the treatment substances and/or the additives centrally through the positive conveyor itself. Thus the invention includes the feature that a positive conveyor is provided for feeding of treatment substances and/or additives by means of an axial hollow shaft through which the treatment substances and/or additives can be dosed.
In this case, for example, the hollow shaft of the positive conveyor can contain outlets along its entire length or in selected sections thereof, preferably, at the end facing the mixing and fluffing device, i.e., as near as possible to the disc rotor.
The hollow shaft can serve to feed in various additives, e.g., to feed in gas over the entire length of the shaft and/or to feed in liquid at the end of the shaft, whereby at least one separate pipe can be included in the shaft for feeding in treatm
REFERENCES:
patent: 2008892 (1935-07-01), Asplund
patent: 2139933 (1938-12-01), Chenoweth
patent: 3682447 (1972-08-01), Zucker et al.
patent: 4202505 (1980-05-01), Ruuskanen
patent: 4220290 (1980-09-01), Johansson
patent: 4253613 (1981-03-01), Reinhall
patent: 4439042 (1984-03-01), Bertoglio
patent: 4872617 (1989-10-01), Foresman
patent: 5429316 (1995-07-01), Arvidsson et al.
Kappel Johannes
Sbaschnigg Johann
Andritz-Patentverwaltungs-Gesellschaft m.b.H.
Cooley Charles E.
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