Measuring and testing – Instrument mechanism or transmission – Rate of change
Patent
1990-11-08
1992-06-02
Raevis, Robert
Measuring and testing
Instrument mechanism or transmission
Rate of change
G01N 1100
Patent
active
051176998
ABSTRACT:
An improved flow-no-flow tester has two major advantages over its predecessor. First, it eliminates the need to invert the test cell after the compaction phase, thereby eliminating the possibility that failure of the compacted sample will occur before the failure load-measuring portion of the test can be done. Second, the improved tester determines the compaction load by measuring the force exerted by the sample against an upper piston, while a compressive force is applied to the sample by a lower piston. This results in greater accuracy than was obtained in the predecessor wherein the compaction load was taken to be the force applied to the compressing piston and which was in error due to the forces of friction and particle binding on the piston as it advanced against the sample. In addition, the improved tester minimizes the potential of particle binding during the failure portion of the test. These advantages result from the structure of the tester, in which the test cell is closed at its bottom by a lower piston that is used for applying the compaction load and that is closed at its upper end by an upper piston against which the sample is pushed in the compaction phase and which is used subsequently for applying a downward failure load. The tester also permits the failure load to be applied at various rates so that the viscous properties of bulk solids and the pseudo strength of fine powders can be measured.
REFERENCES:
patent: 2633027 (1953-03-01), Bunnell
patent: 3890830 (1975-06-01), Dyck
patent: 4719809 (1988-01-01), Johanson et al.
Cox Brian D.
Johanson Jerry R.
Johanson Kerry D.
Jr Johanson, Inc.
McKown Daniel C.
Raevis Robert
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