Pellet cooling system performance is affected by many variables. The first are variables found in the air being used and include: air temperature, air relative humidity, airflow, the amount of air passing through the cooler.
In Samokov, Bulgaria, La Meccanica di Reffo has set up an advanced plant for the production of biomass pellets. It covers an area of about 50,000 square meters, of which 6,000 square meters are used for the production area, wood chip storage and pellet storage and 25,000 square meters for raw material storage.
Press capacity depends substantially on pellet quality (stability according to the PDI, Pellet Durability Index). The durability of pellets shall be determined by tumbling the test sample for 10 seconds at 500 rpm, in a dust-tight enclosure.
Various types of dies are used by the feed manufacturing industry. Die thickness is a factor in the production of high-quality pellets and must be accurately balanced with the formulation and conditioning.