NDLI: Extrudate fracture and spheronisation of microcrystalline cellulose pastes

Content Provider	Springer Nature Link
Author	Rough, S. L. Wilson, D. I.
Copyright Year	2005
Abstract	An experimental study of the ram extrusion and subsequent spheronisation of water-based microcrystalline cellulose (MCC) pastes has been performed. The effects of extrusion velocity, die geometry, and paste water content on the integrity of the extrudate produced were investigated. The apparent severity of extrudate fracture increased with decreasing die length/diameter ratio (L/D), and increasing extrusion velocity. The spacing between the fractures was approximately constant for a given set of process conditions, and increased with increasing émph{L/D} and decreasing extrusion velocity, whilst the flare of the extrudate fracture segment increased with decreasing émph{L/D} and increasing extrusion velocity. Two types of fracture shape were identified, émph{viz}. knuckle-bones and cups, the occurrence of which is explained in terms of the relative extent of the radial and axial strain release at the surface of the extrudate upon exiting the die.The shape and size distributions of the corresponding spheronised pellets were analysed and related to the geometry of the extrudate fracture segments. Severe knuckle-bone fracture gave spherical pellets with a wide size distribution. Visibly smooth extrudates gave non-spherical pellets with an apparently narrow size distribution (as measured by sieving). Extrudates displaying the cup type of fracture generated the best quality pellets in terms of both sphericity and size distribution.
Starting Page	4199
Ending Page	4219
Page Count	21
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	40
Issue Number	16
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Materials Science Characterization and Evaluation Materials Mechanics Continuum Mechanics and Mechanics of Materials Crystallography
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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