Different feed ingredients have a certain impact on the tightness of the extruded feed, and the production process of the puffed feed and the puffed feed is also different from the puffed feed. According to the exclusive report of China Aquatic Channel, with the further development of aquaculture in China, aquatic expanded feed has been used more and more widely. Through the preparation of heat modulation, deep mixing, warming and pressing and pellet forming, the feed raw material mixture passes through the ring. After the mold, expansion occurs due to the pressure difference between the inside and outside of the ring mold to form a puffed feed. Due to the difference in density and the degree of expansion, the expanded feed is divided into three types: puffed floating feed, puffed feed and puffed feed. Puffed feed is the most widely used puffed feed, and the process is relatively mature. The feed tightness of the feed and the puffed slow-feeding feed is different from that of the puffed floating feed, which has different requirements for the feed ingredients and production processes. First, the choice of raw materials for different types of extruded feed With the rapid development of China's aquatic feed industry, puffed feed has been vigorously promoted in recent years, bringing revolutionary impact to China's aquatic feed and aquaculture industry. Due to the obvious advantages of puffed feed relative to pellet feed, China's puffed feed has been quite popular, including puffed floating feed, puffed slow feed and puffed feed. For example, the use of puffed floating feed includes grass carp and tilapia. , squid, etc.; the use of extruded feeds mainly include crabs, prawn, squid, etc., while some fish require a puffed feed to slow down due to aquaculture or feeding habits, which can increase feed intake, for example Dalings, rivers and sea larvae. Soaking turbot feed In the aquatic feed puffed feed, the feed ingredients used are mainly fish meal, meat meal, soybean meal, rapeseed meal, cotton aphid, DDGS, rice bran, corn protein powder, rice protein powder, distiller's grains, brewer's yeast, flour, wheat, sub-powder, fish oil, Soybean oil, vitamins, mineral salts, etc. The animal protein source is subjected to deep processing and ripening treatment, resulting in poor adhesion between raw materials and a certain influence on the tightness of the feed; and different plant material raw fiber content is different, when the feed is puffed, Puffing equipment will have different effects, and the tightness of the feed will vary greatly. Therefore, when producing different puffed feeds, different feed ingredients should be selected according to different feed costs, process characteristics and feed tightness requirements. Crab material floating and sinking comparison
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