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JR Johanson, Inc.

City: San Luis Obispo
State/Country: CA US

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US7451666 - Apparatus and test procedure for measuring the cohesive, adhesive, and frictional properties of bulk granular solids -  11/18/2008 
A test apparatus for measuring the cohesive, adhesive and frictional properties of bulk solids has a bulk solid sample confined between two essentially parallel plates with a single load applied that produces both shear and normal stress and strain to the bulk solid in a manner that nearly uniformly distributes stress throughout the granular solid test region. The apparatus has a close proximity of the plates compared with the length of the plates in the direction of shear, the design of a load hanger to produce a resultant load near the shear plane, the roughening of any surface in contact with the solid that is not intended to have shear on it and involves one-directional movement of the parallel plates with respect to each other and the control of both the direction and magnitude of the applied load relative to the parallel plates. A test method uses the apparatus to measure the unconfined yield strength angle of internal friction and steady state deformation effective angle of internal friction with a single test. A test method uses replacement of the lower part of the test sample with a plate of material that the bulk solid may be required to slip on and measures the friction angle and adhesion of the bulk solid on the plate of material.
US20070163328 - Apparatus and test procedure for measuring the cohesive, adhesive, and frictional properties of bulk granular solids -  07/19/2007 
A test apparatus for measuring the cohesive, adhesive and frictional properties of bulk solids has a bulk solid sample confined between two essentially parallel plates with a single load applied that produces both shear and normal stress and strain to the bulk solid in a manner that nearly uniformly distributes stress throughout the granular solid test region. The apparatus has a close proximity of the plates compared with the length of the plates in the direction of shear, the design of a load hanger to produce a resultant load near the shear plane, the roughening of any surface in contact with the solid that is not intended to have shear on it and involves one-directional movement of the parallel plates with respect to each other and the control of both the direction and magnitude of the applied load relative to the parallel plates. A test method uses the apparatus to measure the unconfined yield strength angle of internal friction and steady state deformation effective angle of internal friction with a single test. A test method uses replacement of the lower part of the test sample with a plate of material that the bulk solid may be required to slip on and measures the friction angle and adhesion of the bulk solid on the plate of material.
US20030161214 - Racetrack-shaped dynamic gravity flow blender -  08/28/2003 
Apparatus for blending particulate solids or liquids includes a blending vessel having a racetrack-shaped cross section at each elevation above its lower end. The racetrack-shaped cross section consists of two spaced opposed semicircles having ends that are joined by two spaced parallel line segments. Several embodiments of the apparatus are described; they all employ the racetrack-shaped blending vessel, which is highly effective in promoting mixing. In one embodiment the racetrack-shaped blending vessel is rotated about a horizontal axis so that the material passes through the vessel on each revolution. In another embodiment, a number of racetrack-shaped blending vessels are connected in a vertical sequence so that the material must pass through the blending vessels in succession.
US6494612 - Racetrack-shaped dynamic gravity flow blender -  12/17/2002 
Apparatus for blending particulate solids or liquids includes a blending vessel having a racetrack-shaped cross section at each elevation above its lower end. The racetrack-shaped cross section consists of two spaced opposed semicircles having ends that are joined by two spaced parallel line segments. Several embodiments of the apparatus are described; they all employ the racetrack-shaped blending vessel, which is highly effective in promoting mixing. In one embodiment the racetrack-shaped blending vessel is rotated about a horizontal axis so that the material passes through the vessel on each revolution. In another embodiment, a number of racetrack-shaped blending vessels are connected in a vertical sequence so that the material must pass through the blending vessels in succession.
US5289728 - Flow-no-flow tester -  03/01/1994 
An instrument for measuring certain physical properties of a sample of particulate material so that the flow characteristics of the material can be determined includes an improved compaction assembly having an upper piston that is surrounded by a retractable sleeve and further includes an improved test cell having cylindrical walls, having a failure outlet smaller than the diameter of the failure piston, and having a false bottom that can easily be removed from beneath a sample of compacted material to permit the failure portion of the test to be carried out. The tester can be used for determining the confined yield strength of the material, its bulk density, and its permeability.

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