Fish Feed Pellet Extruder

Fish Feed Pellet Extruder

A fish feed pellet extruder is a kind of pellet machine that makes feed for fish, shrimp, crabs, pets, etc. The ingredients to make fish feed can be Corn, rice, wheat, bone meal, soybean meal, meat meal, Fish meal, tapioca flour, algae meal, oil, vitamins, and minerals. According to different uses, our machine can make floating fish feed and sinking fish feed. Different from the process technology we have a dry-type and wet-type fish feed extruders.

Dry Type Fish feed extruder advantages
- Feeding evenly and constantly: Flat-bottomed scraper mechanism and feeder controlled by transducer make sure that the materials can be fed evenly and constantly.
- Cutting quickly and accurately: The removable cutting mechanism uses knives with good elasticity, which attach to the die plate tenderly can be regulated in six directions, and can be operated quickly and accurately.
- High efficiency and low power consumption: With a conditioner, the steam and water can be directly injected into the extruding chamber through the special mechanism, thus the quality and quantity of products can be improved greatly with lower power consumption.
- Wide application: Variably configurations of screw bolts can match the producing demands for different formulas and raw materials.
- Longer service life: Screw bolts and dies are processed through vacuum quench treatment, also be processed with high processing precision and have long use longevity.
- Easy operation: All the operating parts like steam valves, etc, adopt the humanization design, in order to facilitate actual operations.

The main body of the dryer-type fish feed extruder is almost the same as the wet type, the only difference is on top of the machine there is no conditioner, and raw material feed into a screw rod from a screw feeder without ripening.

Dry-type fish feed extruder technical data

A wet-type fish feed extruder is equipped with a boiler that can continuously provide hot steam. It can produce all kinds of floating or sinking aqua feed for fish, eel, shrimp, crab, loach, bullfrog, etc, and can produce many kinds of pet feeds for cats, dogs, and etc. The pellet size can range from 0.9 to 15mm to feed fish of different sizes. With high capacity and top-quality products, our fish feed extruder is a preferred choice for medium or large-size feed processing factories and aquaculture farms.
Extrusion means to cook the mix of ingredients under temperature, moisture, and pressure in the fish feed extruder. When working, the temperature in the extruder chamber is 100-120℃ by electrical heating. So it can kill bacteria and pathogens when running. There is a temperature indicator on the machine. Once it reaches the set temperature, it will stop heating automatically by the reaction of the thermocouple. During the high-temperature ripening process, the starch and fiber of the raw material become swell. Then under the pressure-tight condition, the material will be formed into pellets by shaping mold. In the end, through the high pressure produced by the regular rotating of the screw, after being cut by the forepart cutter which rotates regularly and high-speedily, the finished products will be shrunk and become small average puffed balls at room temperature and pressure.

Wet-type fish feed extruder features

- Screw sleeve adopts jacketed construction, which can be injected with hot steam or cooling water, thus the extruding temperature can be controlled effectively.
- The conditioner can make the materials have full gelatinization of starch by a combination of hot steam and mechanical shear/mixing. The materials may remain in the conditioner for a time over the 180s.
- We can make the conditioner from stainless steel as well as carbon steel. The carbon steel conditioner is cheaper while the stainless steel conditioner is much better to make feed.

Wet-type fish feed extruder technical data

How to Choose Dry Type or Wet Type Fish Feed Extruder?

The fish feed pellet extruder can be divided into two types: dry type fish feed extruder and wet type extruder. The differences and features of the dry-type extruder and wet-type extruder:
1. The dry type fish feed extruder does not need the steam boiler while the wet type is equipped with a conditioner and needs to equip the steam boiler. So the dry-type fish feed pellet extruder is cheaper and easier to use and operate.
2. The feed pellet made by the wet-type fish feed pellet machine is smoother and of better quality because the material is ripened and mixed enough in the conditioner compared with the dry-type extruder.
3. The capacity of the wet type fish feed pellet machine is higher than the dry type feed pellet machine, so usually, the wet type fish feed machine is suitable for large feed pellet factories while the dry type fish feed pellet machine is better, and economic for the small and medium-size user or factory.

Fish Feed Pellets: To Sink or to Float?

Commercial fish diets can be classified into floating (extruded) or traditional sinking (pressure-pelleted) pellets. Both floating and sinking feed can produce satisfactory growth, but some fish species prefer floating, others sinking. There are both pros and cons to the two types of pellets. However, the use of floating pellets provides more advantages compared to sinking ones:
1. Reduce Waste. Sinking pellets that remain at the bottom of the tank will often get lost and wasted. However, the floating feed pellets can retain their shape, even after being in the water for many hours, uneaten feed is still intact.
2. Decrease Disease. Sinking pellets that remain at the bottom of the tank will eventually rot, which may give rise to a proliferation of bacteria and the spreading of harmful fish disease.
3. Convenient Observation. Another reason to feed floating (extruded) pellets is that the farmers can directly observe the feeding intensity of their fish and adjust feeding rates accordingly. Determining whether feeding rates are too low or too high is important in maximizing fish growth and feed use efficiency. However, sinking pellets will fall into the bottom of the tank, even fish can not find them.

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