Extruded Pellets Vs Pelleted Pellets which is best?

About Extruded Pellets

Extrusion is a high temperature, short time heating process that minimizes the degradation of food nutrients while improving the digestibility of protein and starch. Fish feed puffers are ideal machines for processing floating or sinking aquafeeds, requiring only recipe adjustments. Compared to pelletizing, extrusion requires higher moisture, heat and pressure. Temperatures above 100°C are required to allow the feed to expand as it leaves the die. Extrusion is divided into wet extrusion and dry extrusion.

High temperatures in dry extrusion are obtained by mechanical energy dissipation on heated surfaces such as the barrel and screw surfaces, or by shear forces between the wall and the material and between the screw and the material. For wet extrusion, the temperature is achieved by pretreatment and steam injection. The material is also subjected to a relatively high pressure.

The pressure difference between the internal and external environment of the expander results in the extrusion of the aquafeed. As the material is extruded through the die hole at the end of the extruder barrel, some of the water in the superheated dough immediately evaporates and causes expansion. Popular machines used for pellet extrusion are wet fish feed extruders and dry fish feed extruders.

Small Floating Fish Feed Machine

About Pelleting Pellets

Pelletizing is the process of compressing small particles into larger solids with a specific shape and texture, involving a combination of moisture, heat and pressure. These larger uniform particles formed by the coalescence of small components, also known as dense particles, sink rapidly in water. Aquatic feed pelletizers are specialized feed pelletizers used to produce granular aquatic feed.

The main factors affecting pelleting are ingredient characteristics, moisture or cooking prior to pelleting, die thickness and binder.
The quality of pelleted feeds is usually influenced by the fat, fiber and starch content of the formulation. Due to chemical or physical properties, some ingredients can reduce the fracture resistance and water stability of pellets.

Additives used primarily as pelleting aids are often used in fish feed formulations to reduce fines and improve water stability.
During the pelleting process, steam may be added to the ingredients used for starch pasting to promote binding of the ingredients. Typically, an amount of steam is added to the malt slurry to increase its moisture content to about 16% and temperature to about 85°C prior to passing through the pelletizing die.

Fish Feed Machine Price

Extruded Pellets Vs Pelleted Pellets

Extruded feed
Pelleted feed
Bonding degree
Floating and sinking
Just sinking
Stability in water
Fines in aquafeeds
Nutriment digestibility
Processing cost
Equipment wear

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