GNEE GROUP

How to control the quality of the pelleting process in fully automatic animal feed production line? Next, we will discuss these aspects in detail.

Requirements for automatic animal feed production line equipment before granulation

The feed pelletizer equipment is required to be inspected and maintained before production to ensure product quality. It includes the following aspects:

(1) Operators must clean the pellets and the magnets on the top once every shift. If they do not clean them, iron in the feed may enter the animal feed pellet mill ring die and affect the normal operation of the animal feed pelletizer machine.

(2) Monitor the wear of the ring die and the press roller: the wear of the press roller may affect the animal feed production capacity; excessive wear of the press die reduces the effective thickness of the press die and affects the quality of the pellets.

(3) Lubricate the pressure roller regularly to ensure that the pressure roller works normally.

(4) Check whether there is material backlog in the pellet cooler machine, and check whether the cooling plate or screen surface in the cooler is damaged.

(5) The roller of the animal feed hammer mill crusher should be inspected regularly: if the corrugated teeth of the roller become blunt, it will reduce the crushing capacity and reduce the product quality.

(6) Check every shift whether there are holes, blockages and adhesion on the screen surface of the grading screen, and the screen surface is intact and undamaged to achieve the correct particle classification effect.

(7) Check the cutter of the animal feed pellet production machine: the cutter is worn and blunt, which will increase the feed powder.

(8) Check the steam separator of steam to ensure the quality of steam entering the conditioner. Otherwise, it will affect the annual production capacity of the beam and the pellet quality of the feed.

(9) When changing materials, check whether the buffer bin and finished product bin above the pelletizing equipment for animal feed are completely emptied to prevent mixing.

Quenching and tempering technology

Pigs feed and chickens feed generally sweat corn, with high starch content and low crude fiber content.Therefore, the structure and strength of pellet feed depend on tempering technology. This process uses heat and steam to soften the raw materials and improve their pelleting performance. During conditioning, the starch in the feed is partially gelatinized. The gelatinized starch acts as a binder, which helps increase the pellet forming rate.

The conditioning time of a general conditioner is 10-20 seconds. Extending the conditioning time can:

(1) increase starch gelatinization;

(2) increase feed temperature and reduce harmful microorganisms;

(3)We improve production efficiency and increase output when the particle quality is low. At low vapor pressure, heat and water dissipate faster, supporting this process.

To improve the tempering effect, operators must control the vapor pressure. They can adjust pellet feed to 16–18% moisture and 75–85 °C according to actual operation requirements.

Correct adjustment of the pressure roller gap can prolong the service life of the ring die and pressure roller and improve production efficiency and particle quality.

The adjustment requirements are as follows:

Adjust the pressure roller so that, when the ring die rotates at low speed, the pressure roller only touches the high point of the ring die. This gap is important because it minimizes metal contact between the ring die and the pressure roller. As a result, it reduces wear. In addition, it ensures there is enough pressure to rotate the pressure roller.

Grinding size of granulating raw materials

Determine the particle size requirements of raw materials according to the particle size of the granular product. If the particle size is too fine, the processing speed becomes low, and productivity decreases. On the other hand, if the particle size is too coarse, the forming rate drops, and the pellets are more likely to break. Therefore, the particle size of the feed should be adjusted according to its application. For example, chicken feed can have a larger particle size, with 15–20 mesh being acceptable. In contrast, fish and shrimp feed require finer particles, generally 40–60 mesh. Additionally, some special feeds require even finer sizes, typically 80–120 mesh.

Requirements for the automatic animal feed production line pellets

(1) Pellet forming rate:

The pellet forming rate is determined by sieving pellet feed with a wire mesh that is less than 20% smaller than the pellet size. For example, if the pellet feed has a diameter of 5.00 mm, use a 4.00 mm wire mesh for sieving. The percentage of oversized material represents the forming rate of the pellets. In addition, the forming rate for livestock and poultry feed is required to be greater than 95%. Meanwhile, the forming rate for fish and shrimp feed must be greater than 98%.

(2) Pellet length:

The length of feed pellets depends on their diameter. For pellets with a diameter of less than 4 mm, the length should be 2 to 5 times the pellet size. On the other hand, for pellets with a diameter of 4 mm or more, the length should be 1.5 to 3 times the pellet size.

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