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Regime map development for continuous twin screw granulation
Tu, Wei-Da ; Ingram, Andy ; Seville, Jonathan
Chemical engineering science, 2013-01, Vol.87, p.315-326
[Periódico revisado por pares]
Kidlington: Elsevier Ltd
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Título:
Regime map development for continuous twin screw granulation
Autor:
Tu, Wei-Da
;
Ingram, Andy
;
Seville, Jonathan
Assuntos:
Agglomeration
;
Applied sciences
;
Binders
;
Chemical engineering
;
Exact sciences and technology
;
Extrusion
;
Granular materials
;
Granulation
;
Granules
;
Mixing
;
Polyethylene glycol
;
Powders
;
Regime map
;
Screws
;
Sintering, pelletization, granulation
;
Size distribution
;
Solid-solid systems
;
Twin screw granulation
É parte de:
Chemical engineering science, 2013-01, Vol.87, p.315-326
Notas:
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ObjectType-Article-1
ObjectType-Feature-2
Descrição:
A promising method for continuous wet granulation is to pass powdered solids and binder through a twin-screw extruder, usually, as in this case, with co-rotating screws. In the current work, the relationship between operating conditions and product granule properties has been investigated using the same materials (microcrystalline cellulose and polyethylene glycol) as in an earlier study of conventional batch granulation using a high shear mixer-granulator (Tu et al., 2009), enabling a direct comparison to be made. Two extruder configurations were used: with barrel diameter/length dimensions of 16mm/16mm and 16mm/64mm. Two regimes (granulation and extrusion) were recognised for the short mixing geometry, while three regimes (granulation, extrusion and blockage) were recognised for the long mixing geometry and the staggered geometry. The resulting regime maps suggest that optimal granulation (narrow granule size distribution and large mean granule size) can be achieved with a higher liquid-to-solid ratio and a higher screw speed. The uniformity of size distribution can be improved by reprocessing and/or more aggressive mixing. ► Three extruder granulation regime maps are developed. ► The effect of extruder screw speed is mainly to change the fill level in the barrel. ► The fill level and the torque are proportional to the LS ratio until reaching a critical ratio. ► The manufacturing conditions for large and narrow GSD coincide with high shear wet granulation.
Editor:
Kidlington: Elsevier Ltd
Idioma:
Inglês
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