Conveyors: fluid current – With means to control conveying fluid or movement of load in... – Control of conveying fluid
Patent
1977-07-11
1979-05-29
Reeves, Robert B.
Conveyors: fluid current
With means to control conveying fluid or movement of load in...
Control of conveying fluid
222317, 406 33, 406 62, 425256, 406163, 406156, B65G 5340
Patent
active
041565460
ABSTRACT:
A method and apparatus for improving the flow of a powder from a source, such as a large hopper, to the intake of a conventional machine wherein such powder is compressed into tablets. Devices are arranged along the route of powder flow so as to restrict, decelerate and depressurize such powder flow and thereby prevent its surging, compaction and/or bridging. These devices are also arranged to maintain the powder in a loose condition of uniform density.
In the preferred embodiments, said devices include most or all of a return duct to the powder source, an upper filter to atmosphere, an upper baffle against which the powder is directed, a restriction, an elongated powder tube through which the powder flows, a lower baffle and a final pressure relief filter to atmosphere. Mechanism in the tableting machine receives the thusly prepared powder and forms it into tablets much faster than previously possible. Also, said devices increase substantially the range of materials, including powders and granules, which can be compressed into tablets.
REFERENCES:
patent: 2890081 (1959-06-01), Terrett
patent: 3105620 (1963-10-01), Atkins et al.
patent: 3195958 (1965-07-01), Goins
patent: 3322957 (1967-05-01), Scoggin
patent: 3489464 (1970-01-01), Delfs
patent: 3694037 (1972-09-01), Feder
patent: 3726954 (1973-04-01), Munk et al.
patent: 3874560 (1975-04-01), Powning
Hine Charles R.
Peot Craig B.
Reeves Robert B.
Rowland James L.
The Upjohn Company
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