Fluent material handling – with receiver or receiver coacting mea – With means to move supply means and/or receiver to – from or... – Relatively receding discharge assistant and receiver...
Reexamination Certificate
2002-08-06
2004-02-10
Douglas, Steven O. (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
With means to move supply means and/or receiver to, from or...
Relatively receding discharge assistant and receiver...
C141S286000, C141S047000
Reexamination Certificate
active
06688345
ABSTRACT:
The invention relates to a method according to the preamble of claim
1
and a device according to the preamble of claim
3
for densifying and compacting pulverized or powdered material.
Such a method and device is disclosed in U.S. Pat. No. 3,664,385 A, which describes a method and an apparatus for feeding and compacting finally divided particulate material by means of a rotating screw feeder disposed in a tubular sleeve with a plurality of perforations. The sleeve is surrounded by a housing in such a way that at least one closed hollow chamber is provided extending about the sleeve. A mesh screen having smaller mesh openings than the size of the particles in the transported material is disposed to the exterior surface of the sleeve. A suction pressure is applied along the exterior of the foraminous sleeve to withdraw air from between the particles of the material, and intermittently a gas pressure is applied along the foraminous sleeve to back-flush material from the perforations to prevent clogging thereof.
EP 0 125 585 A discloses an equipment for the removal of air out of pulveruent materials comprising a packaging vessel having at a distance from the exterior wall a porous lining material substantially over the entire length of the packaging vessel through which lining material it is possible to remove air out of the packaging vessel or to feed pressurised air into the packaging vessel through the space between the exterior wall and the porous lining material. The space between the exterior wall and of the lining material is divided air-tightly in the direction of progress of the pulverulent material by means of partition wall, wherein a suction or pressure can be applied to each of the compartments independently from each other.
It is also known to densify pulverized material between two pressing rollers, wherein the pulverized material is pressed into the roller gap by means of, for example, two feeding screws arranged in parallel beside each other and disposed rotatably in a housing, into which the pulverized material is filled via a filling hopper under the effect of gravity. Gas or air contained in the pulverized material has a disturbing effect and can deteriorate the densifying operation between the two pressing rollers.
To remove air contained in the pulverized material before entering into the roller gap, it is known to provide a filter in the screw housing on a peripheral portion of the feeding screws via which filter vacuum can be applied.
It is the object of the invention to increase the efficiency of such a device for densifying pulverized material.
This object is achieved according to the invention by the features in the characterising part of claims
1
and
3
as well as by the features of claim
6
.
REFERENCES:
patent: 3664385 (1972-05-01), Carter
patent: 3788368 (1974-01-01), Geng et al.
patent: 4185669 (1980-01-01), Jevakohoff
patent: 5538053 (1996-07-01), Derby
patent: 5894871 (1999-04-01), Greer
patent: 6102088 (2000-08-01), Wegman
patent: 533537 (1973-02-01), None
patent: 2260464 (1973-06-01), None
patent: 0125585 (1984-11-01), None
patent: 668394 (1952-03-01), None
patent: 2034591 (1980-06-01), None
Derwent Abstr. 1975-D3320W [13] for IT 3589 A-71 (1971) which is the priority document for DE 2260464.
Arisa Josep
Iglesias Joan
Ciba Specialty Chemicals Corporation
Crichton David A.
Stevenson Tyler A.
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