The effect of mixing on the extrusion – spheronisation of 1
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چکیده
9 The effect of mixer shear strain rate on the performance of a model 10 micro-crystalline cellulose pharmaceutical paste undergoing extru11 sion–spheronisation was studied using a laboratory scale planetary 12 mixer and a screw-based mixer. The maximum shear strain rate in 13 each mixer was estimated. Five pastes were prepared, one each at 14 97 and 265 s−1 in the planetary mixer, and one each at 304, 988 15 and 2220 s−1 in the screw mixer. The rheology of the pastes was 16 quantified by Benbow–Bridgwater characterisation based on ram ex17 trusion. Each paste was spheronised and pellet size and shape dis18 tributions obtained by automated size analysis. Mixer type (rather 19 than shear strain rate) was found to have the strongest influence on 20 the paste properties, with the screw-mixed material having a higher 21 yield strength and forming smaller pellets with a narrower size dis22 tribution when spheronised under identical conditions. 23
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