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Jaggery output follows the dissolved solids in the juice: cane x juice extraction gives juice weight, times Brix gives solids, and about 88% of those solids survive clarification and boiling as jaggery. Typical recovery is 10-12% of cane weight in a well-run open-pan unit.
Jaggery yield
Juice = cane x extraction %; solids = juice x Brix; jaggery = solids x 0.88
Jaggery retains all the sucrose plus invert sugars, minerals and moisture, whereas sugar milling crystallises only sucrose and rejects the rest into molasses.
Roller pressure, number of mills and the use of imbibition water. Three-roller bullock or motor crushers get 55-65%; a factory tandem with imbibition reaches 92-96%.