Fish Feed Pelleting Extruding Technology and Fish Feed Making Process Control

2021-03-21 Back to List

Fish feed pellet making machine, the main equipment is "screw extruder". The main kinds are fish feed extruder, soybean/corn extruder, and feather extruder. Fish feed extruder is the common machine in the fish feed production line.

1.Extruding Process And Main Kinds Applied in Fish Feed Production

The fish feed making raw material is fed into the fish feed extruder and moves in the form of an axial flow under the screw power. At the same time, due to the mechanical friction between the screw and the material, the material and the barrel, and the material particles, the material is strongly squeezed, stirred, and sheared. As a result, the material is further refined and homogenized. With the gradual increase of pressure, the temperature rises accordingly. Under the condition of high temperature, high pressure, and high shear, the physical properties of the material have changed as follows:

(1)From powder to paste.

(2)Gelatinization of starch.

(3)Protein denaturation.

(4)Partial degradation and refinement of fiber.

(5)Pathogenic bacteria were killed.

(6)Health indicators are improved.

(7)Toxic components were inactivated.

When the paste material extruded from the die hole, under the influence of strong pressure difference, the material is expanded, dehydrated, and cooled. The final product is of loose and porous structure, crisp, good palatability, and flavor. 

2.Fish Feed Extruding Process And Characteristics Of Extruded Feed

(1)Biochemical Process

The process of hydrothermal treatment is accompanied by the biochemical change process of the material. Some materials, such as oilseeds and their cakes, contain a variety of anti-nutrients and anti-feeding ingredients. Under certain moisture and certain temperature conditions, these active substances gradually lose their activity, weakening the destruction of digestive enzymes inside the digestive system of animals, which improves absorption rate and reduces excretion. This not only improves the nutrition value of feed, but also reduces waste and environmental pollution. From the view of the biochemical process, the extruder is a "biochemical reactor".

(2)High-temperature and short-term germicidal detoxification process 

The highest temperature in the puffing process can reach(130-160) °C, while the material in the high-temperature segment is very short, about 5-10 seconds. High temperature can not only kill pathogens and health indications, but also can inactive a variety of harmful factors and enzymes, improving the fish feed quality. 

(3)Better chemical stability and longer quality guarantee period

High temperatures cause various microorganisms and parasitic ovum to be killed and various enzymes( such ad oxidase, lipase, etc.) are inactivated. That excludes a wide range of factors that contribute to the deterioration of the material.

(4)Wide range of process adaptability

The extrusion process can not only improve the feeding quality of a variety of common feed materials, but also can process a large number of unconventional materials into high-quality feed materials, which include wild plants, agricultural by-product, slaughter waste and of livestock and poultry, etc. Fish feed extruder can produce a variety of different specifications and quality of livestock poultry materials, aquatic feed, pets feed, etc. At the same time, the extrusion process is also the most effective technique for the detoxification, preservation, and processing of grain cakes and deep processing of grain.

(5)High-grade product features

Extrusion products are loose and crunchy after being cooled, composite products produced by various components, and Maillard reaction due to high temperature. All these factors constitute better palatability over the original mixture and have a special flavor. These characteristics induce animal feed to intake, thus increasing feed intake and feed effectiveness. This is completely different from the addition of phagostimulant to the mixture, which often has negative effects. 

(6)It can produce special feed with different shape

According to the user's requirements, changing the model design can produce different shapes of large particles, large blocks or bar-like materials, such as prawn feed, pet feed, rare animal feed, etc. This is what the ring die fish feed pellet machine can't do.

(7)Higher digestion rate

For those suckling pigs whose digestive system is not well developed, the starch in the weaning material requires the gelatinization degree of more than 90%. And the aquatic animals also requires the gelatinization degree of the feed should also be higher because their absorption capacity of the original degree is poor. Extruder machine can realize it well.
Therefore, it is better to use extruder than ring die pellet machine to produce aquatic products because due to the temperature restriction, the gelatinization degree of starch processed by ring die pellet machine can not be high, which is generally no more than 50%.

Gelatinization not only improves digestibility, but also improves granulation and shaping because dextrins are good binders. The gelatinized starch molecules crosslink each other to form a network-like spatial structure, lose some moisture after being instantaneously expanded, and become a skeleton of the expanded product after cooling, so that the product maintains a certain shape.

3.How To Choose Fish Feed Making Machine And Its Auxiliary Equipment

With the rapid development of aquaculture, its economic benefit has become considerable. Therefore, various aquatic feeds, in particular floating fish feed pellet, rise in response to this trend. Because aquatic animals like fish and shrimp have small intestines and stomach with bad digest absorption ability, the manufacturing process of aquaculture feed has much higher requirement than that of livestock feed. Which means it’s very important to choose suitable fish feed machine to produce aqua feed.

Before choosing fish feed production line machinery, it's very necessary to learn about the features of aquatic feed:

(1)Small particle size.

Due to short intestines stomach and other physiological properties of aquatic animal, in order to accelerate digest and absorption, the fineness of pulverization of aquatic feed should be smaller than poultry feed. For example, when producing fish feed or prawn feed, the raw material flour size should reach 60-120 meshes which could make sure to make good quality of fish feed pellets. With this reason, the fish feed hammer mill grinding machine would be very important to make sure producing very fine flour material.

Recommend: RICHI fish feed grinding machine. It has two kinds: small grinder machine and fine grinding machine. The final fineness is respectively 60-80 mesh and 80-200 mesh.

(2)High protein content and low carbohydrate.

The protein content of livestock feed is often less than 20%, while that of aquaculture feed is always 30%-40 or more. Especially for the small fish feed which is growing very fast, and some aqua feed protein content is up to 65%-70%. With this, we should choose good feed formula, and using feed mixer machine to mix different materials together. It is one of the key equipment, of which the performance directly affects the production efficiency and product quality of feed plants.

Recommend: Economic Fish Feed Mixer Machine .It is widely used in the evenly mixing of fish feed raw material to ensure quality fish pellet making.

(3)Fish pellet feed structure is compact.

With higher cohesiveness and water resistance. For instance, aqua feed requires the water stability of pellet up to 2-10 hours or more.

Since fish feed production requires higher degree of gelatinization and water stability, the selection of fish feed extruder is very important. Through prolonging materials tempering time and starch gelatinization under high temperature can strengthen adhesive property of feed pellets, kill Salmonella and other various harmful bacteria. Which not only promotes the water stability of fish feed but also improves the palatability and digestibility of feed.

Recommend: Floating fish feed machine. It has two kinds: wet type and dry type. As for which one to choose, it is according to your need and your requirements.