Problems and Solutions of Aquatic Fish Feed
Aquatic feed
Frequently Asked Questions/Solutions
1、 The particle surface is uneven
It has a great impact on the appearance of finished products, and it is easy to collapse when put into water, with low utilization rate. The main reasons are:
(1) The raw materials are crushed too coarse, and are not fully matured and softened during the tempering process, so they cannot be well combined with other raw materials when passing through the mold hole.
(2) In the aquatic feed formula with high crude fiber content, the raw materials are mixed with steam bubbles during the conditioning process. When pressing the particles, these bubbles burst due to the pressure difference between inside and outside the mold, resulting in uneven particle surface.
Control the crushing off
At present, in the production of fish meal, the bulk raw materials are made of 1.2 mm fine powder sieves. The use frequency of sieves and the abrasion degree of hammers are well controlled to ensure the fineness of crushing.
Control steam pressure
According to the formula, the steam pressure shall be adjusted reasonably during production, generally controlled at about 0.2. As there are many crude fiber materials in the aquatic feed formula, better quality steam and reasonable conditioning time are required.
2、 Poor water resistance of particles
This kind of problem is the most common problem in our daily production, which is generally related to the following factors:
(1) Short tempering time and low tempering temperature cause uneven or insufficient tempering, low ripening degree and insufficient moisture.
(2) The adhesive materials such as starch are insufficient.
(3) The compression ratio is too low.
(4) The oil content and the proportion of crude fiber raw materials in the formula are too large.
(5) Crushing granularity factor.
Treatment measures:
(1) Improve the steam quality, adjust the blade angle of the conditioner, extend the tempering time, and properly increase the moisture content of raw materials.
(2) Adjust the formula, appropriately increase starch raw materials, and reduce the ratio of fat and crude fiber raw materials.
(3) Add adhesive if necessary. (Sodium bentonite slurry)
(4) Improve compression ratio
(5) Control the grinding fineness
3、 The particles contain too much powder
Generally, it is difficult to guarantee the appearance of pellet feed after cooling and before screening. The customer reported that there are many fine ashes and powders in the pellet. From the above analysis, I think there are several reasons:
A. The particle surface is not smooth, the incision is not neat, and the particles are loose and easy to produce powder;
B. Grading screen screening is not complete, screen mesh is blocked, rubber ball is seriously worn, screen mesh aperture does not match, etc;
C. There is more fine ash in the finished product warehouse, and the clearance is not complete;
D. There are hidden dangers in dust removal of packaging scale;
Treatment measures:
A. Optimize the formula structure, reasonably select the ring mold and control the compression ratio.
B. In the granulating process, the conditioning time, feeding amount and granulating temperature shall be well controlled to fully mature and soften the raw materials.
C. Ensure that the particle section is neat, and use a soft knife made of strip steel.
D. Adjust and repair the grading screen, and use reasonable screen configuration.
E. The secondary screening process under the finished product bin can greatly reduce the powder ratio.
F. The finished product warehouse and lines should be cleaned in time. In addition, it is necessary to improve the packing and weighing dust removal device. It is better to use negative pressure for dust removal, which is ideal. Especially in the packaging process, the packager should regularly knock the buffer bucket of the packaging scale to remove dust.
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