Seed Production of Vegetable, Tuber and Spice Crops

2. Indented cylinder

• This helps to separate seeds according to the length.
  
• The equipment consists of a slightly inclined horizontal rotating cylinder and a movable separating trough.
  
• The inside surface has small closely spaced hemispherical indentations.
  
• Small seeds are pressed into the indents by centrifugal force and can be removed.
  
• The larger seeds flows in the centre of the cylinder and is discharged by gravity (Fig.4 & 5).




Figure 4: Working principle of indented cylinder- b: round grain application c: long grain application




Figure 5: The flow of seeds over the standard arrangement of one round – grain and two long-grain cylinders