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What is the Cause of the Abnormal Appearance of Plastic Granulator?

May. 12, 2020

In the production of Plastic Granulator pellets, sometimes granules with abnormal appearance may appear. Experienced feed manufacturers will know the reason for this situation and can quickly eliminate them. For inexperienced or new feed manufacturers In other words, sometimes I can't find the crux of the problem. I can only ask the outside world or the granulator manufacturer for help. The following Medium-Speed Granulator Manufacturer introduces the causes and improvement methods of common granules with abnormal appearance. 

Medium-Speed Granulator

Medium-Speed Granulator

1. The pellets are curved and there are many cracks on one side:

This phenomenon usually occurs when the pellets leave the ring die. In production, when the position of the cutter is adjusted far away from the surface of the ring die and the edge of the knife is blunt, when the particles are extruded from the die hole, they are broken or torn by the cutter rather than being cut. Many cracks appeared on one side and on the other side.

Ways to improve:

A) Increase the compression force of the ring mold on the feed, that is, increase the compression ratio of the ring mold, thereby increasing the density and hardness value of the pellets;

B) Crush the feed ingredients finer. If molasses or fat is added, the uniformity of the molasses or fat distribution should be improved and the amount added should be controlled to increase the density of the pellets and prevent the feed from becoming soft;

C) Adjust the distance of the cutting knife from the surface of the ring die, usually the distance of the knife edge from the outer surface of the ring die is not greater than the diameter value of the feed pellets produced, or replace with a sharper cutting blade, which can also be used for small diameter pellets Thin blade, and make the thin blade close to the surface of the ring die to produce

D) The use of cohesive granulation aids helps to improve the cohesion inside the granules.

2. Horizontal cracks traverse the entire pellet

Is somewhat similar to the phenomenon in Case 1. The crack occurred on the cross-section of the particle, but the particle did not bend. This can happen when fluffy feed containing more fiber is pelletized. This kind of granular material is often when the feed is extruded into the granulation hole of the ring die, because it contains fibers that are longer than the pore size, when the particles are extruded, the expansion effect of the fiber causes the granule material to produce transverse cracks in the cross section , Giving the appearance of fir bark-like feed.

Improved Method:

It is to increase the compression force of the ring die on the feed, that is, increase the compression ratio of the ring die; control the crushing fineness of the fiber, its maximum length cannot exceed one third of the particle size; reduce the output to reduce the speed of the feed through the die hole , Increase the density; lengthen the time of conditioning, use multi-layer conditioner or kettle type conditioner;

Our company also has Medium-Speed Granulator for sale, please contact us.


Contact us
  • Mobile:+86 138 1984 3291
  • Tel: +86 574 8623 6922
  • E-mail: sales@aumax-plast.com
  • Skype: aumax.plast
  • Add: Ningbo Economic & Tech Development Zone, Xiaogang, Beilun, Ningbo, China