The preference of good-looking products on the fiercely competing market had animal feed machines manufactures pay more attentions to the appearance quality of extruded feed pellets.
Muyang therefore in here offers some operational tips to help eliminate appearance problems and add value to feed extrusion productions, with the support of our experienced service technicians. The most common problems on the appearance of extruded feed are size difference, irregular shape, and poor pellet surface smoothness.
There are four conditions, under any of which pellets of non-uniform sizes will be produced:
1) Feed mash and water added into the conditioner cannot be evenly mixed with each other because water added into the conditioner is not sufficiently atomized. In this case, the water atomizing nozzle should be checked and cleaned thoroughly to make it free of any blockage.
2) Die holes blocked by large ground particles or foreign matters (usually are accumulated residues), especially when extruding small pellets. Production problems in this case are easy to be identified. The finished pellets usually are uniform at the beginning of production, but this performance cannot sustain for a long time and pellets in large size and small size generated. In this case, it has to stop the extruder to clean the die holes. In order to avoid die hole blockage, the ground particle size of raw material should not exceed 1/3 of the die hole.
3) Screw of the extruding machine is worn out and end of life. This situation can be identified through the clearance between chamber inner wall and screw flight profile. The normal clearance is 1.5mm-2.0mm. When it larger than 5mm, pellets in different sizes are produced. In this case, it is necessary to replace the worn screw with a new one.
4) Feed flow unevenly distributed to discharge at Venture tube because of severe wearing loss of the distributing cone. In this case, the distributing cone should be replaced with a new one.
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