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UMR-CNRS 6144

Optimization of the Wurster Coating processOptimization of the Wurster Coating process

by accurate mass flow monitoringby accurate mass flow monitoring

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Tons of powders today

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Defluidization

Failure of the operation

Lost of coating polymer

Low efficiency

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Nozzle of pulverization

Fines particles Agglomerates

Spray drying Agglomeration

Empirical use

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0

2

4

6

8

10

12

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0 200 400 600 800 1000 1200

Temps (s)

P(102

Pa)

Annulus

0m3/h

21m3/h

96m3/h

128m3/h

52m3/h

155m3/h

S1

S2

S3

S4

172m3/h

Air

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dt

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( C( C

10.429.70(93,1%)0.37(3,55%)0.24(2,30%)0.11(1,05%)Mp=0.8kg

7.376.62(89,82

%)

0.40(5,43%)0.24(3,25%)0.11(1,5%)Mp=0.4kg

Cycle time

(s)

(D) (C) (B) (A)Conditions

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