Mill Hill Engineering Ltd

Pulper drive & rotors

Conveyors are generally of an overlapping steel slat apron design, although this is subject to customer duty requirements.  The slats are bolted to link attachments, carried on 60,000 lbf breaking strain, solid bearing pin chains. The conveyor chain framing is extended upwards to carry slat aprons, preventing loose material spillage.  The conveyor tail and framework incorporates heavy duty take-up units for chain tensioning.  The driveshaft is mounted in spherical roller bearings and is driven via a helical/bevel gearbox and Duplex chains.  On wider slat units, central supports carrying high density wear strips are provided.

For higher consistencies, 15% - 20%, a high consistency is required. This is an independent rotor, incorporating intense shear forces to defibre the stock, The rotor is designed to drag stock to the base of the pulper tub and throw it to the sides, resulting in stock agitation, which causes fibre to fibre shearing, High consistency pulping is used with de-inking applications, since no fibre shortening occurs and the high shear forces rub the ink particles from the fibres.