Raw materials and auxiliary materials should be cleaned of impurities and iron. Cleaning standards are: organic impurities shall not exceed 50mg/kg, and the diameter shall not exceed 10mm; magnetic impurities shall not exceed 50mg/kg, and the diameter shall not exceed 2mm. In order to ensure safety, a grid screen with a width of 30~40mm should be arranged on the feeding pit to remove large impurities. In addition, before the raw material is crushed or the powder is granulated, impurities and iron should be removed. The residues of various mechanical equipment should be cleaned regularly.
The crushing process mainly controls the crushing particle size and its uniformity. Feed particles that are too large or too small will lead to feed segregation, which will destroy the uniformity of the product. All kinds of animals have a suitable powder size range, and the appropriate crushing size should be ensured according to their requirements. During the crushing operation, pay attention to check whether the sieve plate of the grinder is damaged.
The accuracy of ingredient measurement directly affects the content of each component in the feed product, which has a great impact on animals. It is necessary to ensure that the measurement is accurate and the measurement equipment is regularly checked
In production, mixing plays a role in ensuring the quality of feed processing. The control points mainly include selecting a suitable mixer, correct mixing operation procedures, regularly checking the mixing uniformity and optimal mixing time, and preventing cross-contamination when changing formulas or mixing premixes.
The level of feed productivity and quality is not only related to the performance of molding equipment, but also largely depends on the Forming performance and conditioning process of raw materials. For the same machine, due to differences in material characteristics, process conditions and operating levels, its productivity may vary by 3 to 4 times. The process conditions of granulation are formulated according to the physical and chemical properties of the main raw materials in the feed formula and the granulation performance of the diet, mainly including the conditioning conditions of the materials for forming, include steam pressure, temperature, moisture and conditioning time.
Since the supply of raw materials and product sales are restricted by many factors, in order to ensure the normal operation of feed production and sales, it is necessary to establish warehouses for necessary storage. The main factors affecting the storage quality of raw materials or products are:
a. If the temperature and relative humidity of the warehouse are not properly controlled, the stored materials will be agglomerated, moldy and deteriorated;
b. If the management system is not strict, it will cause random stacking or mixing of stored materials, and it will not be possible to enter and exit materials according to time sequence and quantity requirements;
c. If the safety protection is not effective, mice and insects will bite, causing pollution and loss.
Secondly, the particle size of raw materials has a certain influence on the structure and uniformity of pet food, and is also an important control factor. Only when the particle size of the raw material is uniform, can the water absorption of all particles be guaranteed to be consistent, thereby improving the quality of pet food. Although extrusion curing can use raw material particles of various sizes, in order to prevent separation of raw material particles during mixing and transportation before extrusion curing, the particle size and bulk density should be as consistent as possible.
If the raw material particles are too large, it may result in substandard and improperly matured particles in the finished product, which will deteriorate the appearance and palatability of the finished product. If the raw material particles are larger than the die hole, the die hole will be blocked or even partially damaged, resulting in poor product appearance and affecting the processing ability of the system. Only when the particle size of all raw materials is uniform can it be ensured that all raw material particles are fully and uniformly matured in the extrusion process, thereby avoiding hard, under-cured particles in the finished product.