Cooler and Screener

Pellets leave the die at 70–90 °C and 15–18% moisture; bagged hot, they sweat, cake and grow mould. A counterflow cooler brings them to within a few degrees of ambient air while a screener removes fines and oversize before storage.

Counterflow design passes ambient air upward against a descending pellet bed, cooling evenly without shocking the surface. Pendulum coolers suit large or fragile pellets where a falling-column cooler would cause breakage. Rotary and vibrating screeners then classify product and return fines to the die.

Selection depends on pellet size, throughput and available headroom above the bagging line.