This situation lies in the powder used for pelleting, containing no crushed or semi-crushed large particles of raw materials, due to failure to fully soften in the tempering process, the particles are relatively hard and large, in the die hole through the pelleting machine can not be well combined with other raw materials, so that the particles appear uneven.
Improvements: proper control of the coarseness of powder feed, so that all raw materials can be fully softened in the tempering process; for raw materials containing more fiber, because it is easy to entrain steam bubbles, so do not add too much steam in this formula.
The color of individual pellets or inter-individual pellets is inconsistent?
This situation is more common in the production of aquatic feed, mainly due to the color of individual particles extruded from the machine is darker or lighter than other normal particles, or the surface color of individual particles is inconsistent, thus affecting the quality of the appearance of the entire batch of feed.
Improvements: mainly in the control of the mixing uniformity of the components in the formula and the mixing uniformity of the added water; improve the tempering performance, control the tempering temperature if necessary, using a lower tempering temperature to reduce the color change; control back to the machine material, for easy to produce "flower material" formula, as far as possible without back to the machine material directly granulation, should be back to the machine material and raw material mixing. It should be mixed with raw materials and crushed again; use quality assurance mold, control the smoothness of the die hole, if necessary, sanding the die hole before use.