Roll granulators “Slotter”
Dust-free granulation of sprues and rejected parts is often a decisive quality criteria for return of the regrind produced in acceptable quality for the production process.
The cutting system of the Slotter (slow cutter) consists of a segmented roll rotor and, depending on the version, one or more pre-cutting and counter-cutting blades (image). Larger and bulkier parts are pre‑shredded between the rotating pre-cutting blades and the inside wall of the machine housing. The pre-shredded material is reduced further between the roll rotor and the counter-blades, from where it exits as granulate. Achievable regrind particle size depends on width and height of the tooth flanks and amounts to between 4mm and 8mm with a throughput rate of approx. 5-20 kg/h.
The compact and highly space-saving construction with an angular gearbox enables its use directly at an injection moulding machine. The dividing design of the grinding chamber guarantees fast opening, very good access and therefore super-fast cleaning, e.g. when changing colour or material type.
Slow running Roll granulators: only 25 r.p.m.
The “Slotter” (“Slow Cutter”) type roll mill works without use of sieves and with low speed of just 25 rpm, so that gentle granulation of sprues and gating parts takes place with an extremely low level of dust. ... more