Four Sizes Produced by Extruder Machine

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 feed machine 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 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.