Due to the increasing use of thermal processing equipment in feed mill equipment, such as extruders, extruders or other high-temperature short-term processing equipment, the feed is strongly affected by temperature, moisture and pressure during granulation, extrusion and expansion. This will destroy most of the effects of vitamins, enzymes, microecological preparations and other additives. The post-addition technology is a new technology to solve this problem, that is, adding heat-sensitive nutrients to the back of the thermal processing process.
(1) Direct addition of a suspension or colloid: a substance containing a small amount of biological activity is mixed with a viscous colloid and then mixed with the feed granules. The colloid-coated particles are substantially uniform and have little contamination to the mixer, and are added in an amount of about 2-40 kg per ton of feed. Good feed reminder, this method of addition is more suitable for the production of small batches of feed or farm processing.
(2) Spray addition liquid: Several liquid spray systems have been developed to meet the requirements for the addition of liquid enzyme preparations after feed granulation. It consists mainly of a high-precision dosing pump that ejects a precise amount of liquid through a pneumatic nozzle. In general, the atomized liquid particles are small, and the surface of the feed particles is more uniformly dispersed than the direct addition of liquid or colloid.
(3) Post-addition technology has the following advantages:
1 The heat sensitive trace component can be protected from the heat processing, and the addition amount of these components can be reduced, thereby reducing the production cost. For example, the use of liquid post-addition technology has greatly improved the activity retention rate of vitamins;
2 Putting the drug in the back instead of adding it to the mixer will help reduce the drug residue in the mixer and the back-end equipment, and reduce the cross-contamination. For example, some antibiotics used in pig feed are not allowed in the chicken feed. Thereby improving product quality and safety;
3 The addition of micro-components such as enzyme preparations after granulation or puffing, using offline spraying process, is conducive to adding according to the needs of users, so as to meet the requirements of users;
4 can be "sale or spray", always provide users with fresh products;
5 By adopting the offline spraying process, the feed mill can not only save the number of finished warehouses, but also replace the micro-dosing system which is expensive and takes up a lot of space, thereby reducing the one-time investment of the feed mill.
(4) The equipment that is sprayed after installation is not expensive and the process is not complicated. The disadvantages are:
1 may cause an increase in the powdering rate of pellets;
2A variety of active substances only adhere to the surface of the feed pellets, which are easily peeled off during the transportation of the feed, resulting in loss of feed active substances;
3 The adhesion of the active substance to the surface is more susceptible to light and oxidation, resulting in a large loss during storage.
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