Feed Dryer Machine

Working principle of feed dryer machine

Feed dryer machine, also known as belt dryer machine, mainly uses mesh conveyor belts to carry materials and achieve uniform drying through hot air circulation. Here is its detailed working principle:

  • Materials waiting to be dried, like expanded feed, biomass pellets, and grain products, are evenly spread on the conveying mesh belts by pipes. Each motor is paired with one layer of the mesh belt, and the motor is equipped with a frequency converter to adjust the mesh belt speed.
  • The high – temperature hot air generated by the heating system is conveyed into the inside of the dryer through pipelines. The hot air forms a circulating flow inside the dryer and conducts sufficient heat exchange with the materials on the conveying mesh belt.
  • .Under the effect of the hot air, the moisture in the materials is evaporated and flows upwards along with the hot air. Meanwhile, there’s a fan at the upper end of the oven. The humid and hot air is discharged by a fan to maintain a dry environment inside the dryer.
  • Under the action of hot air, the moisture in the material and flows upward with the hot air. At the same time, there is a bellows at the upper end of the oven, which discharges humid and hot air through the fan to maintain the drying environment inside the dryer.
  • When the material passes through the drying area of the dryer machine, its moisture content has reached the requirements. Each layer of mesh belt runs to the tail, and the material enters the lower mesh belt through the hopper, and then proceeds in turn, and is finally discharged from the discharge port to complete the entire drying process.
Working principle of feed dryer machine
Aquatic feed processing
Pet food production
Special feed processing
Cereal products field

Key Components and Structure of a Feed Dryer Machine

After understanding the working principle, you also need to understand the main parts of the feed dryer machine and comprehensively consider the performance of the equipment to buy a durable and high-yield feed drying machine.

  1. Feeding device: There is a pipe above the machine, and the materials are evenly laid on the conveying mesh belt.
  2. Conveying mesh belt: A single – layer or multi – layer (usually 3 – 5 layers) stainless steel mesh belt is used to support and convey the materials.
  3. Hot Air System:It typically consists of a hot air furnace, a burner, and a heat exchanger, etc., which is used to generate high-temperature hot air and provide a heat source.
  4. Drying box body:It has an insulated and sealed structure to reduce heat loss.
  5. Transmission device:It is driven by a motor. The motor drives gears to pull chains, which in turn move the crossbars. The crossbars then drive the mesh belts to operate. The speed can be adjusted according to the state of the materials.
  6. Humidity exhaust system:The moisture exhaust fan is used to discharge the moisture generated during the drying process, maintaining a dry environment inside the dryer.
  7. Discharge Device:It is used to discharge the dried materials from the dryer.

Main types of feed dryer machine

There are mainly two types of RICHI feed dryer machines. One is the ordinary dryer machine belt, which is suitable for single-screw extrusion line .The other is the mesh -belt circulating dryer, generally applicable to double – screw extrusion lines. Each of them has its own advantages.

Feed dryer

Fish dryer machine

  1. The equipment structure is clear, which makes it easier for workers to start operating faster. There is no complex circulation air circuit design, the number of parts is small, the cost is relatively low, and the maintenance is convenient.
  2. It can flexibly handle various materials, especially those with good air permeability like pellet, flaky, and strip – shaped ones. It has a high tolerance for different material forms.
Belt dryer machine

pet dryer machine

  1. All the materials of this belt dryer machine are made of stainless steel, and the internal mesh belt is Teflon, which is more high temperature resistant, better breathable, making it more conducive for hot air to enter.
  2. Heat source provision: There’s a heat exchanger above the machine, and there are steam plates. Heat exchange takes place between the steam and the materials on the mesh belt to dry the materials.
  3. With circulation function inside: The fan above the machine extracts the humid air inside the oven and recommits to the heat exchanger for secondary heating. This way, it continuously dries the materials, enhances the utilization of the heat source, and saves fuel.

Both of these two types of dryers are widely used in various production lines for aquatic feed and pet feed. They can effectively reduce the moisture content in extruded feed to an appropriate standard. In practical applications, RICHI can provide suitable models and configurations of feed dryers according to the characteristics of customers’ materials and production requirements, so as to achieve the best drying effect.

Cases of feed dryer machine

Malaysia 1.5-2T/H Seawater Fish Feed Drying machine Project
Philippines 1-1.5T/H Shrimp Feed Drying equipment Project
Italy 2T/H Premium Pet Food Drying machine Project
Egypt 2T/H Tilapia and Catfish Feed Drying machine Project
Chile 1T/H Salmon Aqua feed Drying mill Project

RICHI Feed Dryer Machine
  • The hot air circulation system is adopted, which can save energy by more than 30% compared with the traditional non-circulating dryer. The hot air is recycled many times in the system until the humidity reaches the set value, and then it is partially dehumidified by the dehumidification fan, and dry cold air is introduced to effectively reduce energy consumption.
  • The hot air temperature is dynamically adjusted through the automatic control system, and the highest and lowest temperatures can be set. The system automatically adjusts the steam flow according to the feedback from the temperature sensor to ensure the stability of the drying temperature, prevent overheating or insufficient drying, and ensure the quality of feed.
  • The equipment adopts a multi-layer mesh belt structure design to effectively increase the drying area. The material is transported in layers between different layers of mesh belts to avoid accumulation and agglomeration, making the drying more uniform.
  • The imported PET woven mesh belt has high ventilation efficiency, strong temperature resistance, stable operation, and effectively improves the drying efficiency by more than 25%.
  • The drying time can be freely adjusted according to the shape and thickness of the material to avoid the “wet core” phenomenon of the material and improve the product qualification rate.
  • Each temperature zone of the feed dryer machine is equipped with an independent circulation fan, heating device and fresh air system. The temperature is gradually raised from low temperature to 100℃ and then slowly lowered. The discharge temperature is set at a low level to effectively prevent the nutrients from being damaged and ensure the integrity of the nutrition and appearance of the pellet feed.
  • The upper and lower convection + left and right cross hot air circulation mode is adopted, and the material is evenly heated on all four sides, the moisture deviation rate is <2%, and the drying consistency is strong.
  • Equipped with a large flow forced ventilation device to improve the permeability of hot air; the operating parameters (such as temperature, humidity, and air volume) can be independently controlled to achieve the best drying effect.
  • It is particularly suitable for drying materials with high moisture content such as aquatic puffed feed and pet feed. After drying, the moisture content can be controlled in the range of 2%-10%, which is conducive to subsequent oil injection, cooling, storage and other operations.
Frequently asked questions

How to choose a suitable feed dryer?

Select according to the material characteristics: the density, moisture content of different materials varies, and the appropriate drying temperature and mesh belt speed need to be selected.

Consider capacity requirements: Choose the appropriate equipment model and drying layer number according to the production scale.

Pay attention to the type of heat source: Choose electric heating, steam heating or gas heating according to local energy conditions and costs.

Attach importance to after-sales service: Choose a manufacturer with good after-sales service to ensure the long-term and stable operation of the equipment.

Application of feed dryer on production line

As a crucial part of the extruded feed pellet production line, the mesh feed dryer acts as the last line of defense. The production process of extruded feed generally includes steps like raw material crushing, mixing, conditioning, extrusion, drying, cooling, sieving, and packaging. The mesh feed dryer is positioned after the extrusion process and before the cooling process in the production line. It’s the core equipment for removing excess moisture from the extruded feed.

Specific process of puffed feed production line

If you are new to the extruded feed industry, you need to understand that a complete extruded feed production line is necessary to help you quickly clarify the structural construction of the processing plant and realize the conversion from basic raw materials to high-quality puffed feed.​​​​

In the raw material pre – treatment stage, customers first determine the raw materials for pellet feed, such as corn and soybean meal. They use equipment like a cylindrical screen to remove impurities. Then, the raw materials are crushed to the appropriate size by a crusher. After that, the feed is formulated according to market demand by mixing the ingredients in the right proportions and ensuring they are thoroughly blended.

Then it moves on to the conditioning and extrusion stages. An appropriate amount of steam, water, and oil is introduced into the mixed raw materials for conditioning, which raises the temperature and moisture content of the raw materials. After that, they are sent into a screw extruder. Under the high – temperature, high – pressure conditions as well as the extrusion and shearing action of the screw, the raw materials are extruded through the die holes and expand, forming porous pellets. The extrusion process not only improves the palatability of the feed but also enhances the protein digestibility.

The moisture content of the extruded feed is between 18% – 25%. It needs to be dried in a feed dryer machine. In the dryer, hot air comes into contact with the wet material on the mesh belt, evaporating the moisture. Finally, the moisture content is reduced to around 10%. After drying, the feed has a relatively high temperature. It then passes through a cooler to lower the temperature of the pellets and remove excess moisture, so that the pellet feed meets the specified quality standards.

Finally, the oil is sprayed onto the feed using a spraying machine. For aquatic feed, a coating is also applied to enhance its water resistance. Unqualified pellets are removed by a screening device, and the qualified feed is then packaged, completing the entire production process.

Our dryers can also be used in pet feed production lines and various fish feed production lines. If you just update the equipment, we can also provide a single product. You can find product equipment of all sizes and models at RICHI.

RICHI feed dryer machine realizes uniform drying of materials through mesh belt structure and hot air circulation system, ensuring the stability of product quality. Whether it is improving feed conversion rate or building a new feed processing plant, our dryer is your best choice!

30 years of industry experience

Since its establishment in 1995, RICHI Machinery has amassed 30 years of rich experience in the design, production, and R & D of fish feed manufacturing plant. With our profound technical accumulation and global development, we can provide our customers with reliable equipment and solutions.

Customized turnkey solutions

We offer a complete turnkey production line, covering project design, equipment manufacturing, installation and commissioning, and personnel training, according to your specific needs. Whether it’s a small farm or a large feed factory, we can tailor a suitable production plan for you.

Complete after - sales service

We have a comprehensive after – sales system, providing you with all – round services from pre – sales consultation to after – sales maintenance. This includes professional and systematic training to help you quickly master equipment operation and maintenance skills and maximize project requirements.

Built Around Your Needs

We can create customized turnkey pellet production line projects based on your unique requirements. For example, we provided customized technical solutions and operation training for the feed dryer machine to help the production line operate stably in the long term. You can find us on YouTube.

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