an apparatus and process to maintain control of the temperature of low - melting compounds , high melt flow polymers , and thermally sensitive materials for the pelletization of such materials . the addition of a cooling extruder , and a second melt cooler if desired , in advance of the die plate provides for regulation of the thermal , shear , and rheological characteristics of narrow melting - range materials and polymeric mixtures , formulations , dispersions or solutions . the apparatus and process can then be highly regulated to produce consistent , uniform pellets of low moisture content for these otherwise difficult materials to pelletize .