In comparison to the established twin-screw machines,the application of a planetary roller granulator for continuous operation of melt granulation is a promising alternative based on the unique process concept.An init...In comparison to the established twin-screw machines,the application of a planetary roller granulator for continuous operation of melt granulation is a promising alternative based on the unique process concept.An initial study focused on the material transport during processing as a key driver for the overall performance.Hereby,the impact of direct process parameters on the residence time distribution was the main objective.These investigations are complemented in this study by considering the free processing volume,which is defined by the number of planetary spindles applied within a module.The impact on the processing conditions is evaluated with respect to the process setting in terms of feed rate and rotation speed.The results highlight the potential of altering the underlying transport function in planetary roller melt granulation(PRMG)via the investigated direct process and equipment parameters.The impact of the feed rate is lower in comparison,while a higher rotation speed as well as a higher free processing volume promote material mixing.Moreover,a normalization of the determined residence time distribution(RTD)model data was feasible with respect to the process settings and the number of applied planetary spindles in the processing zone.This demonstrates the key role of the free processing volume in the fundamental mechanisms of material transport and mixing during PRMG.展开更多
Regime maps are vital in twin-screw granulation,predicting outcomes via dimensionless numbers.This study develops a novel regime map for twin-screw melt granulation,adapting a wet granulation model.Using Design of Exp...Regime maps are vital in twin-screw granulation,predicting outcomes via dimensionless numbers.This study develops a novel regime map for twin-screw melt granulation,adapting a wet granulation model.Using Design of Experiments,screw speed,screw configuration,temperature,and binder amount were optimized with lactose and PEG 6000.Results show how these variables impact on particle size and flowability.Optimal conditions(20 wt%PEG,70℃,100 rpm)yielded granules with 0.360 mm median size and 6.67%Carr Index,indicating excellent flow.Increased binder and kneading elements led to larger granules,while higher screw speed enhanced mixing.Elevated temperatures boosted binder melting.The regime map accurately categorized growth,largely in the breakage-dominated region,and was validated across systems,proving its predictive potential.展开更多
文摘In comparison to the established twin-screw machines,the application of a planetary roller granulator for continuous operation of melt granulation is a promising alternative based on the unique process concept.An initial study focused on the material transport during processing as a key driver for the overall performance.Hereby,the impact of direct process parameters on the residence time distribution was the main objective.These investigations are complemented in this study by considering the free processing volume,which is defined by the number of planetary spindles applied within a module.The impact on the processing conditions is evaluated with respect to the process setting in terms of feed rate and rotation speed.The results highlight the potential of altering the underlying transport function in planetary roller melt granulation(PRMG)via the investigated direct process and equipment parameters.The impact of the feed rate is lower in comparison,while a higher rotation speed as well as a higher free processing volume promote material mixing.Moreover,a normalization of the determined residence time distribution(RTD)model data was feasible with respect to the process settings and the number of applied planetary spindles in the processing zone.This demonstrates the key role of the free processing volume in the fundamental mechanisms of material transport and mixing during PRMG.
基金support by the Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET)through PIP 11220200102762COAgencia Nacional de Promoción Científica y Tecnológica(ANPCyT)through PICT-2021-CAT-I-00116Universidad Nacional del Sur(UNS)of Argentina through PGI 24M/183.
文摘Regime maps are vital in twin-screw granulation,predicting outcomes via dimensionless numbers.This study develops a novel regime map for twin-screw melt granulation,adapting a wet granulation model.Using Design of Experiments,screw speed,screw configuration,temperature,and binder amount were optimized with lactose and PEG 6000.Results show how these variables impact on particle size and flowability.Optimal conditions(20 wt%PEG,70℃,100 rpm)yielded granules with 0.360 mm median size and 6.67%Carr Index,indicating excellent flow.Increased binder and kneading elements led to larger granules,while higher screw speed enhanced mixing.Elevated temperatures boosted binder melting.The regime map accurately categorized growth,largely in the breakage-dominated region,and was validated across systems,proving its predictive potential.
