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, theThis 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, pellet machines 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 oil mill plants and urea content.
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.