The solution lies in improved pellet mill

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  machine for pellets 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,  oil equipment  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.
 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.