SEDL / STP / STP1183-EB / STP25141S

Continuous Process for Starch Encapsulated Herbicides

Wing, RE
Research Chemist, National Center for Agricultural Utilization Research, Agricultural Research Service, Peoria, IL

Carr, ME
Research Chemist, National Center for Agricultural Utilization Research, Agricultural Research Service, Peoria, IL

Doane, WM
Research Leader, National Center for Agricultural Utilization Research, Agricultural Research Service, Peoria, IL

Pages: 7    Published: Jan 1993

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Abstract

Up to new all reported starch encapsulation processes for pesticides were either batch or semicontinuous. Now a continuous process for encapsulation has been developed which involves twin-screw extrusion with die-face product pelletizing into granules. If a very small particle size is desired, the extruded granules can be dried, ground, and reclassified. The process and equipment used to produce the products containing various amounts of active agent loading and rates of release are described.