The D type hydrapulper increase hydrapulper capacity by improving bale submergence. The large bales (typically of OCC and mixed waste furnishes) tend to float and spin in a round tub pulper, taking excessive time to wet out and submerge. The D tub design increase the turbulence in the tub, causing the bale to submerge rapidly. Its bowed D wall disrupts the circular flow pattern of a round tub, displacing the vortex and creating a strong hydraulic nip to submerge the bale.

Type D pulper, hydrapurger, drum screen, ragger and grapple make up of continuous pulping and discharging system, it can hanle material including OCC, AOCC etc, the plastic, styrene and other light and heavy rejects can ben discharged from the tub before being broken and flow through the screen plate. Thus the stock quality is improved.