FUNDAMENTAL STUDIES OF THE DISPERSIBILITY OF POWDERED MATERIALS
Final rept. 3 June 1960-31 June 1963
GENERAL MILLS INC MINNEAPOLIS MN
Pagination or Media Count:
This is a fundamental study of factors affecting the flow and dispensability of finely divided organic powders. Most of the investigations pertain to three base powders saccharin, Carbowax 6000, and Span 60. These powders were chosen to represent crystalline, waxy, and gummy types of powders, respectively. Late in the program, a fourth powder egg albumin was added to the list of powders to be investigated. The preparation of powders including grinding, deagglomeration, blending, coating with surface active agents, etc. is discussed. The various tests for measuring physical properties of powders including particle size distribution, shear strength, bulk tensile strength, bulk density, dynamic angle of repose, dispensability, and electrostatic charge are de scribed. The major studies are 1 bulk tensile strength tests, 2 effects of humidity on powder properties, 3 effects of antiagglomerant agents on powder properties, 4 mechanism by which Cab O-Sil functions, 5 effects of surface active agents on powder properties, 6 effects of ad sorbed foreign vapors on powder properties, 7 effects of removal of adsorbed gases and vapors, 8 energy required to disperse a powder sample, 9 properties of compacted powders, and 10 egg albumin studies.
- Miscellaneous Materials
- Test Facilities, Equipment and Methods