Heat and pressure are two key factors in the production process. Heat can soften the natural lignin of the raw material, especially for wood material, thus to bind the loose feedstock in hard and shiny pellets with high density. That is to say the temperature of pellet die significantly determines the quality of pellets and the productive efficiency.
In the beginning of the production, the raw material should be delivered into the pellet machines in a low speed. As the temperature rises, the speed is escalated accordingly. If the speed is fast when feeding into too much feedstock in the starting stage, it is very probably to block up the pellet die. Pellet die with high content of high chrome may have a low probability of being blocked up. The time to reach the optimum temperature for the pellet die may cost from a few minutes to half an hour. As soon as the optimum temperature is achieved, the productivity is maximum.
Apart from the rising temperature of pellet die, other methods can also provide heat to make pellets. One of the common ways is steam conditioning. Steam conditioning is applicable for large-scale production. After processed by steam conditioning, the raw material will be more soften as it enter the granulating chamber, which will make it easier to form into pellets with a glossy surface.