Pellet mill pellet causes of abnormal appearance

In the pellet mill pellet production, sometimes unusual appearance of granules, experienced machine for pellets will know the cause of this situation is, and

Can be quickly ruled out, for lack of experience or a new manufacturer, it sometimes can not find where the crux of the problem, only requests outside or pellet mill

Manufacturer for help. Following the appearance of the seven common abnormality pellet causes and ways to improve it to introduce to you, which is the author engaged in the pellet mill

Development and debugging many years of work experience, for use in the production of comparative reference.
1, pellets exhibit many side bending and crack
This is generally in a particulate material produced when leaving the ring mold. In production, when the cutter position adjustment is too far away from the surface of the ring mold and oil expeller , the particles from the

The extrusion die orifice is touched off cutter instead of being cut or torn, this time some particulate material and the other side bent to one side exhibit many cracks. The pellet

Entering the cooler or during transport, often from these cracks at fracture, causing the production of excessive particulate material powder.
Ways to improve it:
 a) increasing the compression ring die for feed force, which increases the compression ratio of the ring mold, thereby increasing the density of the granules and hardness values;
 b) some of the raw material more finely pulverized, if you add the molasses or fat, molasses or fats should improve the distribution uniformity and control of the amount added in order to improve Pieces

The density of pellets to prevent feed soft;
c) adjusting the knife away from the surface of the ring mold, usually the outer edge surface of the ring mold from a distance not greater than the diameter of the particles produced, or replace the use of more front

Lee cutting blades, for Pellet mill of small diameter thin blade material can also be used, and to a thin surface of the blade close to the ring mold production;
d) Use of adhesive class granulation aids, help to improve the binding force within the particles.
 2, the horizontal crack across the entire pellet
Case 1 and is somewhat similar to the phenomenon, the occurrence of cracks in the cross-section of the particles, but particles are not bent. When the fluffy fibers contain more granulation, the

This situation may occur. Such particles in the feed material is often squeeze ring pelletizing die hole, wherein the content ratio of the diameter of the fiber length, when the particle

Is extruded, the result of swelling of the fiber material in the cross section of the particles produced across the crack, resulting in fir bark-like appearance.
  Improved approach is to increase the ring mold compression of raw materials, which increases the compression ratio of the ring mold; control the fiber grinding fineness, can not exceed the maximum length

A third size; reduce productivity material through the die orifice to reduce the speed, increasing density; lengthened quenched time, multi-layer or kettle quenched

Type conditioner; when moisture is too high or powder containing urea, it was also possible fir bark-like material appearance, should be controlled to add moisture and urea content.
 3, pellet produces a vertical crack
In some feed formulation containing fluffy and slightly flexible material, this material after quenching Cooditioner swelling when, after compression ring die pellet

After due to the role of water and raw material itself has elasticity and bounce, resulting in vertical cracks.
   Improvement lies in: Change formula, but doing so may increase the cost of raw materials; controlled quenching quality of the steam used, try to adopt a more saturated

Dry steam, so as to minimize the added water; reduce productivity or increasing the effective length of the die hole, as the feed hole in the mold retention time

Room increase; adding a binder also helps to reduce the incidence of vertical cracks.