Laboratory: Powder and paste rheology

Measured properties
 
Method/Measuring device
 

• Powder tap density

• Tapped density tester (Stav)

• Powder bulk density 

• ISO 697 bulk density measurement setup 

• Particle solid density

• Gas pycnometry (Quantachrome)

• Powder compressibility

• Texture Analyser (Stable Micro Systems) with powder compression die

Powder shear behavior:

• Flowability ffc

• Cohesion

• Coefficients of inner/wall friction

• Compression strength

• Storage consolidation

• Ring shear testers (Schulze, Brookfield)

• Heating/cooling cell for ring shear tests (temperatures -30 °C - +200 °C)

• Translation shear tester (Jenike)

• Powder stirrer rheometer (self-developed)

• Storage shear cells for time consolidation measurements

• Test setup for flow under vibration (self-developed) 

• Powder angle of repose

• Angle of repose setup (in air or liquid, vibration) (self-developed)

• Moisture analysis (Sorption/desorption)

• Dynamic vapor sorption with Raman (SMS)

• Infrared Moisture Analyser (Sartorius)

• Controlled humidity/temperature chamber

• Min. fluidization velocity

• Self-developed fluidized bed test setup for measurement of umf

• Powder permeability (air or liquid)

• Self-developed fixed bed test setup for pressure drop measurement
• Pressure drop and pore size measurement (Topas)

• Silo discharge/filling behavior

• Silo setup with adjustable hopper geometry: mass flow measurement/
   estimation of the flow profile (self-developed)

• Blending behavior 

• Blending continuous silos in lab. and pilot scale (height of 4 m)

• Forces in silos

• Force measurement sensors in silos (lid, installations)

• Rheology of complex
   fluids and suspensions 

• Rheometer Rheostress 6000 (Haake), temperature range -5 - +200 °C

Compounding/extrusion
• hotmelt/nanoparticle reinforcement of plastic
• paste extrusion

• Twin Screw Extruder with two powder feeders, liquid injection system,
   eating cartridges (max. 400°C) (Leistritz)
• Paste squeezing test setup with different dies (self-developed)