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Inspection of pellet feed quality

2019-07-15

The inspection of pellet feed quality mainly includes: forming rate, pulverization rate (durability), hardness, stability in water (it is required for aquatic feed). In addition, there is a certain requirement for the appearance of the quality of the pellet feed.

1. Forming rate.

The forming rate is the proportion of the particle amount and the total amount of the powder after it is pressed. It is a measure of feed formula, quenched and tempered, powder particle size, pressure model etc. comprehensive performance of an index. At the time of the test, we screened the size of a sieve with a diameter of 0.8 times the diameter of the sieve. Generally, the forming rate is required to reach above 95%. If it fails to reach this standard, the reason must be found out for improvement.

2. Pulverization rate (durability).

The pulverization rate (durability) indicates the solidity of the particles and their ability to withstand various handling and handling processes without being damaged. During the test, the pulverization rate was measured by a tester (chamber method). To get the sample of 500 grams passing through the sieve, the sample is in the box, spinning at 50 revolutions per minute for ten minutes, then pouring the sample over the weight, and the powder should be less than 5% qualified.

3. Hardness.

Hardness is the ability of a particle to withstand stress without being destroyed. Generally, small particles are not easy to be crushed, so the diameter of the small particles under 3mm can`t do hardness measurement.

4. Stability in water.

Water stability is expressed in terms of the time it takes the particle to dissolve in water. Different varieties of aquatic feeds have different requirements for water stability. In order to improve the stability of water, in addition to using the above methods to improve the quality of particles, but also can increase the number of modulators, adding binder, before and after the increase of curing device and other measures, especially after the curing device and keep for a long time, so as to improve the degree of starch gelatinization, the effect is more obvious.

In addition, there are three requirements for the appearance quality of pellet feed:

(1)Uniform length: Generally, the particle length is about 2~2.5 times of the diameter. The length is not uniform, not only affect the appearance of the particles, but also on the molding rate and powder rate will have an impact, because the short material is more, more section, more broken point, it is easy to produce powder.

(2) Powder content: Since a user is buying a pellet feed, it is sure desirable that the less the powder is better. However, some powder will be produced in the process of pelleting, so the powder should be screened out with a grading sieve before packaging, and sent back to be granulated again, in order to reduce the amount of powder in the finished product of granulated material.

(3) It is also important that the gloss and color of the surface are consistent, which can reflect the quality of particle, powder mixture is uniform and other issues.

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