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The HydroPac® C28 is a high intensity pulper that processes and reduces baled cellulose fibers into individual fibers and fiber bundles. Processing the desired furnish is achieved through the combination of mechanical and shearing forces being imparted by the rotor and the bedplate to the stock.

Induced by the rotating action of the rotor, the furnish is drawn inward and thrown upward against the tub as it strikes the rotor blades.

Baffle plates are placed at the bottom and the inside wall of the tub to prevent excessive circular movement, and allows the stock to move back to the center of the tub at a shorter time.

The mechanism has a special 8-vaned stainless steel rotor mounted on the top end of the vertical drive shaft and bolted to the bottom of the HydroPac® C tub.

Eight (8) additional vanes are fitted at the top of the main vanes of the rotor to create a fully developed circulation pattern that increases the number of passes that the stock gets to be in contact with the rotor and the extraction plate.

The extraction chamber could be made either of stainless steel, or mild steel with stainless steel cladding. It is fabricated, machined and bolted to the tub bottom flange.

An annular perforated extraction plate (the bedplate) is bolted to the top of the extraction chamber to facilitate easy extraction of accept stock from the DetrashPac.


A strip of hardened wear plate (stellite) is fitted in the extraction plate to avoid the accumulation of strings and other materials that would damage the bottom of the rotor.

The bedplate can be made of different steel materials depending on operation specification.

A high technology dry packing gland based on the use of mechanical sealing compound TomPac® is used in the packing chamber. Based on non-compression technology, this special packing provides better sealing than the conventional braid packing usually supplied.

The drive block housing containing the well-sized bearings and drive shaft is supported by a solid carbon steel support rigidly attached to the bottom face of the extraction chamber.

At the top end of the shaft, ESID® (Energy Saving Intensity Defibering) rotor is fitted with a device to adjust the rotor bottom/extraction plate gap, which is generally kept at 1.0 mm to 1.55 mm.

The ESID® rotor is a solid 8-vane defibering part with 4 high circulation vanes and 4 low circulation vanes located at the top of the defibering vanes.

The ESID® rotor could be made of various high wear-resistant materials depending upon the specific operational requirements. Surface treatment or / and hardened materials could also be added onto the rotor surface.

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