Puffed fish bait processing is a new feed processing technology, feed puffing equipment in the extrusion cavity puffing is actually a high-temperature transient process: the mixture is at high temperature (110 -200 ℃), high pressure (25-lOOkg / cm2), and high shear, high moisture (10 -20 % or even 30 %) of the environment, through continuous mixing, tempering, heating and pressure, maturation, extrusion die hole and sudden pressure drop to form a puffy porous feed.

the advantages of puffed feed

1. improve the utilization of feed

Puffing process of heat, moisture, pressure and various mechanical effects, so that the starch molecules within the 1 , 4 - glycosidic bond break and generate glucose, maltose, maltotriose and maltodextrin and other low-molecular-weight products, puffing process can increase the degree of starch pasting, fiber structure of the cell wall is partially destroyed and softened, releasing part of the enclosed, combined with digestible substances, while fat from the At the same time, fat penetrates from the inside of the pellet to the surface, which gives the feed a special flavor and improves palatability, thus increasing the feeding rate. In addition, the protein in plant protein feed, after moderate heat treatment can blunt some protease inhibitors such as antitrypsin, urease, etc., and make the hydrogen bond and other secondary bonds in the protein broken, causing the original spatial conformation of the polypeptide chain to change, resulting in protein denaturation, the denatured protein molecules become fibrous, peptide chain stretching loose, molecular surface area increased, flow blocked, and increased contact with the enzymes in the animal After denaturation, the protein molecules are fibrous, the peptide chains are loosened, the surface area of the molecule is increased, the flow is blocked, and the contact with the enzymes in the animal's body is increased.

2. Reduce the pollution of the environment

Puffed floating fish feed in the water stability performance is good. Extruded puffed feed particles, is dependent on the internal starch paste and protein organization of the feed and the product has a certain adhesion or binding force, its stability generally up to 12h or more, up to 36h, so it can reduce the dissolution of feed nutrients in water and precipitation loss. Some data show that the general use of puffed floating fish feed than powder or pellet feed can save 5 %-10 %, and can avoid feed residues in the water, reduce water pollution.

3. reduce the occurrence of disease

Feed materials often contain harmful microorganisms, such as aerobic organisms, neutrophilic bacteria, Escherichia coli, mold, Salmonella, etc. The content of animal feed materials is relatively high. The puffing of high temperature, high humidity, high pressure can kill most of the harmful microorganisms. Some data show that the number of E. coli per gram of raw materials up to 10 000, puffed only less than 10, Salmonella in more than 85 ℃ after high-temperature puffing, can basically be killed, which will help maintain water quality and reduce the adverse environmental factors of aquaculture, while reducing the mortality of aquatic animals.

4. Improve culture density

Under artificial culture conditions, the increase in culture density means that the higher the rate of return received by the farmer. When the aquaculture density per unit of water is increased, the space for fish in the aquaculture water is reduced, and the requirements for water quality are much higher than the level of the natural environment. Because the use of puffed feed can reduce the feed coefficient, so that the residual bait and excrement discharged into the water body is greatly reduced, it is possible to significantly increase the density of breeding.

5. extend the storage period of feed

Extruded puffing process by reducing the bacterial content and oxidation, thereby improving the stability of raw materials. Extruded puffed products drying, cooling, has been reduced to 0.6 feed water activity (AW), or even reach 0.4, which is equivalent to the moisture content of 8% to 10%, to better improve the storage stability of feed.

6. Feeding management is convenient

Aquatic puffed feed can be suspended for a long time in the water (in the water), feeding does not require a special feeding table, only fixed-point feeding can be. Fish feeding needs to float ten water surface, direct observation of fish eating, timely adjustment of feeding, and timely understanding of fish growth and health status. Therefore, the use of aquatic puffed feed to help scientific feeding management, both to save a lot of time, but also to improve; high labor productivity.

7.can meet the needs of animals with different feeding habits