Drum Pulper

Drum Pulper

Drum Pulper is new and advanced waste paper pulping equipment, an upgrading product from traditional hydrapulper. When pulping, fibers are dispersed at most. Larger impurities in accepted pulp can be screened out. Meanwhile, ink on surface of fiber can be stripped out under mechanical and chemical effect. Pulping effectiveness depends on the raw material, chemicals, pulping time and intensity. The equipment integrates pulping and screening, thus is more applied to pulping unsorted waste paper. It helps increase the recycling and usage of secondary fiber with less pollution. It’s also energy saving and contributes to realize the localization of paper making equipment and save foreign exchange. That is why it brings greater economic and social benefits.


  • This single machine is able to continuous pulp and primarily coarse screen, simplifying the following purge and separation.
  • Deflaking force on fibers is not severe so that the physical characteristic of fiber can be kept to the largest extent.
  • Longer pulping time brings sufficient deflaking. Loss rate of good fiber is no more than 0.8%.
  • Lower specific energy consumption and less operation cost, almost no quick-wear part, 7*24h continuous work is permissible, lower maintenance cost.
  • Less size reduction of contaminants and higher reject discharging efficiency, reduce burdens of downstream processes.

Structure and Principle

Having both pulping zone and screening zone, the machine enables to pulp and screen at the same time. Waste paper are conveyed into pre-soaking section and high consistency pulping zone by a conveyor. At 14-18% consistency, along with rotation of the drum, materials are repeatedly lifted to a height by the baffles lined on the interior surface, then dropped against the hard bottom surface. Waste paper can be defibered because of the mild and effective shearing and rubbing force without reducing the size of contaminants like thin films, plastics, grits, rags and other harder rejects. As the drum continuously rotates and slightly inclines, stock goes forward into screening zone after pre-soaking and pulping. When going through screening zone, the stock is diluted to consistency at 3-4% because water runs in from side of the drum. Diluted stock goes into pulp chest through screening holes. Larger rejects are left in screening zone and move forward, finally discharged from the opening at the end of screening zone.

Technical Parameter

Model ZDG250 ZDG275 ZDG300 ZDG325 ZDG350 ZDG375 ZDG400
Drum Diameter (mm) Φ2500 Φ2750 Φ3000 Φ3250 Φ3500 Φ3750 Φ4000
Capacity (T/D) 70-120 140-200 200-300 300-400 400-550 550-720 750-1000
ZDGA Type Motor Power (kW) 110 160 250 315 560 630 800
ZDGB Type Motor Power (kW) 132 200 315 400 630 800 1000