Granulating and mixing equipment for injection molding
Most injection moulding organizations cannot go to the expense of having a complete reprocessing plant consisting of granulator, mixer/extruder, and die- face or lace cutter. The general arrangement is to have a room in a fairly remote corner of the building where material can be granulated using an ordinary masson-type cutter. Although this produces re-work of irregular¬shaped particle size，with a fair amount of powdery material，it is perfectly satisfactory for injection moulding. (a) Granulators The normal granulator has a powerful electric motor driving a heavy rotor，to which are clamped two or more stout cutting blades. The rotor and blades are a clearance fit in a cylindrical chamber having a set of stationary knives. A long feed throat with spring-loaded baffles prevents injury to the operator and also stops pieces of material from flying back from the cutting chamber. About one-third of the cylinder wall of the cutting chamber consists of a screen of suitable size to allow gr...