The production process of aquatic puffed feed generally includes raw material crushing, mixing, secondary micronization, extrusion and puffing, drying, cooling and other processes. Among them, extrusion and puffing play a very important role in the entire process, and have a greater impact on the quality and production efficiency of the feed. big. To this end, this article discusses the working characteristics and reasonable selection of single and twin-screw aquatic feed extruders, providing a reference for manufacturers to correctly apply aquatic feed extruders, so that extrusion technology can truly play a role in production. To achieve the purpose of increasing production, reducing consumption, and improving nutrient digestibility and energy utilization during feeding.




Structural characteristics and working principle of puffing fish feed pellet machine:
The extrusion extruder is mainly composed of a barrel and a screw that rotates in the extruder barrel for expansion. There are two categories of single-screw extrusion extruders and twin-screw extrusion extruders. During the extrusion process, the material enters the die cavity from the feeding port and is extruded, mixed, compressed and sheared when pushed forward by the screw. Due to the driving force, friction force, shearing force and external heating, the material is heated under pressure, reaches a high temperature and high pressure state, and matures into a modified paste. When the material is extruded from the front die hole, the temperature and pressure suddenly drop to normal temperature and pressure, causing the water in the material to vaporize and evaporate rapidly, and the volume expands rapidly to become a puffed product.

Technical information of 180-250kg/h Diesel Engine Automatic Puffing Fish Food Making Floating Pet Feed Extruder:
Model | WSJY-40 | WSJY- 50 | WSJY-60 | WSJY-70 | WSJY-80 | WSJY-90 | WSJY-120 | WSJY-135 | WSJY-160 | WSJY-200 |
Capacity --- kg/h | 30-40 | 60-80 | 120-150 | 180-250 | 300-350 | 400-450 | 500-700 | 800-1000 | 1200-1500 | 1800-2000 |
Pelleting Diameter--- mm | 1-8 | 1-8 | 1 -10 | 1-10 | 1 -10 | 1 -10 | 1-10 | 1 -12 | 1-12 | 1-12 |
Motor Power--- kw | 5 | 7.5 | 15 | 18.5 | 22 | 37 | 55 | 75 | 90 | 132 |
Cutting Power--- w | 400 | 400 | 400 | 400 | 1100 | 1500 | 2200 | 2200 | 2200 | 3000 |
Screw Rod Diameter-- mm | 40 | 50 | 60 | 70 | 80 | 90 | 120 | 135 | 160 | 200 |
Cooking degree | >95% | >95% | >95% | >95% | >95% | >95% | >95% | >95% | >95% | >95% |
Size(m) | 1.4*1.03*1.1 | 1.45*1.08*1.25 | 1.46*1.14*1.25 | 1.6*1.4*1.35 | 1.6*1.4*1.35 | 2.1*1.45*1.35 | 2.1*1.45*1.35 | 2.55*2.05*1.65 | 2.9*2.65*1.8 | 3*2.85*1.9 |
Weight(kg) | 260 | 350 | 355 | 580 | 700 | 950 | 1700 | 1900 | 3600 | 4300 |




Issues that should be paid attention to when selecting an aquatic feed extruder:

Puffing effect of puffing machine:

Investment price of extrusion extruder:
The equipment investment cost of a twin-screw extruder is 1.5 to 1.7 times that of a single-screw extruder with the same production capacity; the cost of wearing parts is about 1.5 times that of a single-screw extruder; the power consumption is also about 1.5 times that of screw extruder.
Service life of extruder:
Extruders from different manufacturers have different service lives due to different structural characteristics and materials used. Therefore, when selecting an extrusion extruder, special attention should be paid to the wear resistance of some wearing parts and whether the structural design is reasonable and whether the purpose of reducing screw wear can be achieved; in addition, when selecting an extrusion extruder, Consider whether the machine can truly achieve the purpose of energy saving and consumption reduction. For raw materials that have not been subjected to ultrafine powder, the wear of the wearing parts will be more serious, especially for twin-screw extruders. In this case, it is more reasonable to choose a single-screw extruder.
Control method of extrusion extruder:
Most extrusion processing is manual or semi-automatic. The quality of extruded products has a great relationship with the quality of the operators themselves. Manual control of the feed, the addition speed of steam and water, and the temperature of the product will cause the quality of the granular products to be unstable, especially the non-uniformity of moisture, so that the moisture content after drying cannot reach the target, producing substandard products and causing greater economic losses to the feed mill. Taking an aquatic product extruder with an output of 6 tons per hour as an example, when the moisture content of the granules exceeds the safe storage moisture, the granules will become moldy; when the moisture content of the granules reaches the safe storage moisture, for every percentage point of water reduction, the economic loss of the feed factory will reach 80% per year. Thousands. The fully automatic control method uses advanced computers to control the flow of materials, water and steam, automatically adds them according to settings, and implements alarms for all faults, eliminating the influence of human factors related to the operation of the extruder and the unavoidable fluctuations in product quality.
Raw material to make puffed floating feed pellet:
Commonly used raw materials and proportions
1.Chicken feed
Commonly used raw materials: corn, bean cake, bran, wheat, fish meal, protein powder, etc.
Ratio: corn 70%, bean cake 10%, bran 10%, wheat 5%, fish meal 5%.
2.Duck ingredients
Commonly used raw materials: corn, bean cake, bran, wheat, fish meal, protein powder, etc.
Ratio: corn 60%, bean cake 15%, bran 10%, wheat 5%, fish meal 5%, protein powder 5%.
3.Pig feed
Commonly used raw materials: corn, bean cake, bran, wheat, fish meal, protein powder, etc.
Ratio: corn 55%, bean cake 15%, bran 15%, wheat 5%, fish meal 5%, protein powder 5%.
4. Beef feed
Commonly used raw materials: silage corn, bean cake, bran, wheat, rapeseed cake, corn gluten, etc.
Ratio: 50% corn silage, 15% bean cake, 15% bran, 5% wheat, 5% rapeseed cake, and 5% corn gluten.
3. Precautions
1. The raw materials and proportions should be adjusted according to the types and needs of the breeding objects to ensure that the feed is nutritionally reasonable, safe and harmless.
2. When selecting raw materials, attention should be paid to quality and reasonable combination, otherwise it will affect the puffing effect and utilization rate of the feed.
3. During the operation of the extruder, pay attention to controlling the temperature and humidity to ensure the extrusion effect of the feed.


