Wet Type Fish Feed Extruder

A wet-type fish feed extruder is a professional feed processing machine that uses steam pre-conditioning to produce high-quality floating, slow-sinking, or sinking aquatic feed pellets. It’s ideal for large and medium-scale commercial aquafeed production, offering better pellet quality, higher gelatinization, and greater water stability compared to the dry-type fish feed extruders. Different from the dry type extruder, the wet type fish feed machine is equipped with a boiler that can continuously steam the materials to make fish pellets. It is a crucial machine for making high-quality fish pellets and pet food. We supply fish feed extruder machines with capacities ranging from 200 kg/h to 5,000 kg/h. Customized complete fish feed production lines are available.

Wet Type Fish Feed Extruder Main Applications

• Floating fish feed for species like tilapia, catfish, trout, salmon, and carp.
• Slow-sinking or sinking feed for bottom feeders and shrimp.
• Aquaculture feed for freshwater and marine fish.
• Pet food production (dogs, cats, birds) with proper formulation.

Parameters of Wet Type Fish Feed Pellet Machine

1. Pre-conditioning – A steam conditioner mixes feed ingredients with steam and moisture before extrusion, softening and partially cooking them.
2. Feeding & Compression – The pre-conditioned material enters the extruder barrel, where a rotating screw compresses and kneads it.
3. High-Temperature Cooking – Combined steam and mechanical friction raise the temperature to 120–160°C, fully gelatinizing starch and denaturing proteins.
4. Extrusion & Expansion – The feed is forced through the die plate, causing a sudden pressure drop that results in expansion.
5. Pellet Cutting – Rotary knives cut pellets to the desired length.
6. Fish Pellet Output – Pellet density is adjustable to control buoyancy (floating, slow-sinking, or sinking).

Wet Type Fish Feed Machine Structure

Feed hopper – Holds the mixed ingredients.
Steam conditioner – Stainless steel chamber where live steam is injected for pre-cooking.
Screw & barrel – Heavy-duty assembly for kneading, cooking, and conveying feed.
Die plate – Shapes pellets (0.5 mm–12 mm standard).
Cutter assembly – Adjustable pellet length.
Main drive motor & gearbox – Provides torque for extrusion.
Frame & base – Ensures stability.

Large Fish Feed Machine Application Scapes

• Large commercial aquafeed producers.
• Medium-scale fish farms with high feed demand.
• Aquaculture feed processing companies.
• Pet food manufacturers require high-quality products.

Superior pellet quality – Higher starch gelatinization (90–95%) and better water stability.
Higher capacity – Suitable for industrial-scale operations.
Longer shelf life – Pellets are well-cooked and less prone to spoilage.
Customizable feed buoyancy – Floating, slow-sinking, or sinking.
Energy-efficient – Steam reduces the mechanical energy needed for cooking.
Better digestibility – Soft texture and improved nutrient absorption.

Steam Pressure: Keep at 0.4–0.6 MPa for consistent conditioning.
Raw Material Moisture: Adjust to 12–15% before extrusion.
Particle Size: Grind ingredients to 0.5–0.8 mm for even cooking.
Die Maintenance: Clean regularly to avoid clogging.
Startup Procedure: Heat the conditioner before feeding materials.
Shutdown Cleaning: Run inexpensive dry material (e.g., cornmeal) to clean the barrel and screw.

Steam Pre-conditioning System. Built-in stainless steel conditioner injects live steam before extrusion. Improves starch gelatinization, protein denaturation, and pellet texture.
High Pellet Quality. Produces feed with 90–95% gelatinization for superior digestibility. Pellets have excellent water stability, lasting 10+ hours without disintegration.
Versatile Pellet Production. Capable of making floating, slow-sinking, or sinking feed. Pellet sizes are adjustable from 0.5 mm to 12 mm to suit fry, juveniles, and adult fish.
Large Capacity Output. Handles medium to industrial-scale production (200–5,000+ kg/h). Ideal for commercial aquafeed plants and large fish farms.
Energy-Efficient Operation. Steam reduces the need for mechanical cooking energy. Lower power consumption per ton compared to dry-type fish feed extruders.
Durable Construction. Heavy-duty steel frame and wear-resistant screw & barrel for long service life. Stainless steel contact surfaces ensure food safety and corrosion resistance.
Adjustable Pellet Buoyancy. Control pellet density by changing screw configuration, moisture, and steam pressure.
Customizable Feed Formulas. Processes a wide range of raw materials: fish meal, soybean meal, corn, rice bran, etc. Supports high-protein and specialty feed recipes.
Stable & Continuous Production. Designed for long-hour, continuous operation in commercial settings. Uniform feed output with minimal variation in size or shape.
Safety & Control Features. Equipped with safety covers, emergency stop buttons, and overload protection. An optional PLC automatic control system for precise parameter adjustment.