The quality of pellet Feed productivity and quality. Besides related to pressure grain of equipment performance, largely depends on the raw material granulating process, performance and pressure due to the process conditions of the difference between the control and operation level, can lead to productivity and production quality has great difference.

A, Feed raw materials characteristics of granulating effect

Feed raw material granulating performance refers to the raw materials to the difficulty of the compressed into particles. The capacity of the raw material properties including material, size and fat, protein, fiber, water, starch content, and its grinding and corrosive, these factors are related to the particle Feed productivity, and will affect the quality and quality of granulating.

1, the impact of capacity

Raw material of the large capacity of material raw material given small granulating production of high energy consumption is small. A main motor is 55 kw Granulator, with cottonseed cake powder (capacity of 640 kg/m3) as raw material, granulating productivity is to use alfalfa meal (capacity of 270 kg/m3) as raw material to the number of times.

2, the influence of particle size

Determine the surface area of the Feed composition of granularity of raw materials. Particle size, large surface area, absorb the moisture in the steam. For moisture adjustment, also easy to pressure forming, grain of high efficiency on working parts wear and tear is small; Particle size is big, can increase the die and roller wear and tear, granulating quality is poor, the corresponding increase of energy consumption, production is low.

3, the influence of the water

The moisture content of raw material for the production and quality of pellet Feed have obvious influence. Grain of adding some water or steam pressure, on the outside of the material of each particle can be formed a thin layer of aquifer, make the material easy bonding between particles, and easily through the air. On the other hand, also can make the raw material of natural adhesive to get dilution, which can effectively improve the granulating of raw material performance. It is advisable to raw material moisture content is around 13%. Raw material moisture content is exorbitant, pressure when the grain is not easy to grasp control of the water added, when adding steam will also affect the granulating temperature increase.

4, the influence of other components.

Feed raw materials in the natural protein, fat content of granulating effect and productivity also has a great influence. Contains natural high protein in the Feed, the large capacity, good plasticity viscosity increase after heating, high pressure grain yield and good quality, but the nonprotein nitrogen (especially the amount of urea), high pressure particle efficiency drops, fat completely lost the bondability, seriously affect the granulating effect. At the same time pay attention to the fiber content in Feed raw materials and heat sensitive content of the Feed control, high fiber content (10% 15%), due to the viscosity difference influence the hardness of particles and forming rate. Although the latter after heated viscosity increases, can make the particle pulverizing rate is reduced, but the temperature above 60 ℃, coking, serious when die hole plug.

In pellet Feed production, according to the physical and chemical properties of Feed formula in the main raw material, granulating performance assess overall raw materials, to select the most suitable processing conditions, to ensure that meet the requirements of granulating productivity and the improvement of the overall performance of the raw material after granulating.

Note: this article from zhengchang group website.

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