Indian Council of Agricultural Research
(Agricultural Knowledge Management Information System)

ICAR-Central Marine Fisheries Research Institute, P.B.No.1603, Ernakulam North P.O., Abraham Madamakkal Road, Kochi-682018 Kerala (
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Instrument Details
Instrument/Facility Name: Twin Screw Extruder
Make                                   : Basic Technology Pvt. Ltd, INDIA
Model                                  : Lab Scale Twin Screw Extruder
Specification   :The system consists of a main drive motor, gear box, feeder unit, extrusion barrel, screws with segmental construction, accessory motors for feeder and cutter units and a control panel. Output: 10-15 kg/h Screws: Co-rotating twin screws Screw speed: 555 rpm (max) Heating system: Ceramic double heating coils Barrel cooling medium: water

Click to ViewTwin Screw Extruder

  Working Principles
Click to ViewThe fish feed mix prepared according to a formula is preconditioned and fed through the feeder unit in powder form with a moisture content of 18-22%. This is subjected to high shear and temperature inside the extruder barrel which results in its cooking and gelatinization. The rotation of screws pushes the material forward and is forced out through a die of desirable size (1-5mm) under high pressure. A knife cutter facing the die cuts the extruded pellets to required length. The sudden drop in temperature and pressure as the material moves out of die results in instant escape of a portion of moisture present in it and simultaneous expansion, which creates air spaces/ pockets inside the pellets. The lower density of feed pellets due to expansion allows them to float in water. The feed is further dried in a hot air oven to a desirable moisture level prior to packing.

  User Instructions
For the production of different types of floating/ slow sinking fish feeds.The orders for fish feeds can be placed through the ATIC counter of ICAR-CMFRI (HQ), Kochi (Ph. +91 484 2394867 (Extn. 405/406/408), Email: The orders may be placed preferably at least a week in advance.

  Contact Us
Contact No. 9496280584
Email Id

  Twin Screw Extruder Charges
Procedure Name
National LAB/R&D
Dr. Vijayagopal, P
400/- per
400/- per
400/- per
400/- per kg for ‘VARNA’ (Ornamental fish feed) and and broodstock feeds

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