What are the tilapia drying problems?

• Tilapia is the main cultured aquatic product in China. Its meat is delicious, less prickly, high in protein, and rich in 8 essential amino acids needed by the human body. It is regarded as one of the main sources of animal protein in the future. 
• Benefits: It has the functions of promoting physical development, protecting eyes, regulating blood lipid, and resisting aging. 
• Drying is an important method for processing tilapia. Because dried tilapia food can meet the requirements of consumers in terms of nutrition, color, and flavor, and it is easy to preserve, it has been loved by consumers. Besides, sometimes people rely on drying to store fresh food safely. Dumping water when drying fish can reduce the breeding of bacteria, mold, and hungry insects. This means that it takes longer for dried fish to deteriorate, making it the perfect choice for camping, hiking, lunch boxes, long-distance driving, and other non-refrigerated environments.

The way to dry the tilapia:

1. Wash tilapia, remove the scales and gills, cut the belly with a knife, take out the internal organs of the fish, and clean them again. If the internal organs are not cleaned, they will taste bitter. 
2. Apply salt evenly to the washed fish, and apply it to every place. Uneven application may lead to rot in some places. (If you want dried fish to be more delicious, you can use lemon, onion, and ginger, spiced powder, pepper, star anise, etc. )
3. Put tilapia in a jar, stack the tilapia with its skin facing down, sprinkle some salt every two or three layers, cover it with bamboo slices, and marinate it with stone for one night. 
4. The next day, take out the dried fish and dry them in the sun. At noon, the sun is strong, so it could be covered with cloth. If there is enough sunshine, it could be dried in three days.  

  It's just the traditional way to dry the tilapia. If we use a dehydrator to dry the tilapia, what should we do?Using the dryer to dry the tilapia can save labor cost, and the tilapias are heated evenly without secondary operation. In addition, drying tilapia in this way can save cost, and the drying effect is better than the traditional drying method.
  The tilapia dryer mainly adopts wave dryer technology.

1.  Adjustment of drying temperature. In the first stage, the temperature is 45℃, the humidity is 30%, the baking time is 6 hours, and the machine is stopped for 4 hours. In the second stage, the temperature is 45℃, the humidity is 20%, baking for 4 hours, and then stopping the machine for 4 hours. In the third stage, the temperature is 55℃, the humidity is 15%, and the bake for 3 hours. In the fourth stage, the temperature is 60℃, the humidity is 10%, and the bake for 2 hours. 
2. About the change of drying rate. The drying process of tilapia is not carried out at a constant speed, such as the rapid drying stage in the early stage, which is only the change of temperature and thickness, resulting in different slope changes of different curves. The drying rate of tilapia fillets first increases, then decreases, and finally tends to be slow, and the drying rate of thin fillets is much faster than that of thick fillets. When the drying temperature is constant, the drying speed of the fish fillet is affected by its thickness, and the thinner the fish fillet is, the faster it dries. On the contrary, the thicker it is, the slower it dries. When the thickness of fish fillets is constant, the temperature has a great influence on the drying speed of tilapia fillets. The higher the temperature, the faster the drying, otherwise the lower the drying speed.

Notes: The temperature of tilapia in the first stage of drying should not exceed 40℃ to 45℃, so it is not easy to crust. Tilapia dried generally adopts the drying process of low-temperature dehumidification. In the early stage, let the internal water be released slowly, so as not to form crusts on the surface. In the later stage, the temperature can be raised slowly until the drying degree meets the requirements. In the drying process, the moisture should be drained in time to avoid the fish from changing taste.

The principle of tilapia dryer machine working 

  Baixin air energy heat pump dryer uses the reverse Carnot principle. The refrigerant is compressed by the compressor to become high-temperature and high-pressure gas, enters into the heat exchanger through the pipeline, and then passes through the fan to remove the heat generated by the heat exchanger send it to the drying room to heat and dry the seafood products and other materials, so that the seafood products are dried, and the moisture is discharged from the moisture outlet. The dehumidification system has a heat recovery device, and the recovered heat is used to heat the fresh air, which can save 60%-70% of the fresh air preheating energy consumption.

The tilapia heat pump dryer machine structure 
 

Tilapia drying video：