ISSN:
0730-6679
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Rotational molding grade polyethylene powders are classified according to sieve size, to typically-35 mesh, and by flowability, usually determined by pouring freeflowing powder from a funnel onto a fixed base cone. In the latter case, the static angle of repose is then measured. This study concentrates on general methods of characterizing powders and relating these methods of flowability of five selected commercial rotational molding grade polyethylene powders. The techniques described in this study include methods for measuring particle size distribution, particle shape characteristics, static and dynamic angles of repose, powder shear strength, and angle of internal friction. All powders examined had similar particle size distribution profiles, with distributions skewed to the coarser, -35 mesh size particles. The static and dynamic angles of repose were quite similar and the latter were essentially independent of the volume fraction of powder in the rotating cylinder and of the speed of rotation of the cylinder. All powders had shape parameters-elongational ratio, chunkiness, circularity, and roundness-that were essentially similar and independent of particle size, and the compressibilities of the bulk powders were not strongly dependent on powder bed height.
Additional Material:
11 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/adv.1989.060090302
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