| 摘要 |
<p>A stator roll(7) and rotor roll(3) form a granulating chamber(10) between them into stator knives(8) and rotor knives project. A cooling system(23) for cooling plastic material to be granulated supplies a coolant into the granulating chamber during the granulating cycle. The coolant is a gas, preferably air, whose temperature is below the plastic solidification temperature of the material. Location of the cooling system is at designated points only, particularly just prior to the stator knives(8) and preferably on a holder for a stator knife. Coolant enters the granulating chamber(10) via small nozzles linked to a relatively large connecting bore and a transverse bore(23). Nozzle bores are radial to the cylindrical granulating chamber and coolant flowing through them lifts the plastic from the inner walls of the stator. Coolant is introduced intermittently, typically two or three times for each cycle with a single burst time of 5-8secs. An Independent claim is included for a method of operating the granulator in which, when a set threshold value of the rotor drive current exceeds a set value, the rotational speed of the rotor is reduced and coolant is introduced via the claimed cooling system into the granulating chamber.</p> |
