Pinch Press


Pinch Press

Model HBD-L/H; HBD-L/H-3L


In addition to the standard dewatering features in a belt press, TRIAD Pinch Presses feature the following advanced functions:

  1. Tension Adjustment – Pneumatic (shown) or Hydraulic Actuated. Two tensioning cylinders for each belt are connected to a rigid tensioning yoke in order to provide absolute parallel tension across the entire width of the belt. The belt tension is constantly set by the cylinders and is adjustable.

  2. Tracking Adjustment – Pneumatic (shown) or Hydraulic Actuated. A pivoted belt tracking roller is provided for each belt. The roller skews from its transverse position and guides the belts centrally along their path. The tracking system functions as a continuous automatic belt guidance mechanism and is an integral part of the press.

  3. Pinch Rollers – Pneumatic (shown) or Hydraulic Actuated.Pinch rollers are designed to add to the compressive force after the shear zone. Rollers are independent from belt rollers. Further compressive force is applied by spring-loaded pinching rollers.


  1. Sludge Conditioning - A polymer/sludge mix/aging tank is included on the press. After the sludge is pumped in and mixed with the polymer in the tank, the physical and chemical characteristics of the sludge solids are changed to reduce the affinity between the solids and water and increase the agglomeration of solids for better dewatering.

  2. Rotary Drum Thickening - After the sludge is conditioned, it flows into the rotary drum filter screen, mounted on the press. Due to the rotating motion, additional free water is separated. On the drum, the gap water is further drained off from the sludge due to the vibration of the belt and the weight of the sludge.

  3. Gravity Belt Thickening - As an alternative to the rotary thickening drum, an integral gravity belt thickener can be included.

  4. Compression Dewatering After the gravity thickening section, the sludge is gradually carried into a compression dewatering section and compressed. Then the sludge passes into the shear dewatering section with a constant thickness.

  5. Shear Dewatering - When the sludge enters the shear dewatering section, there are a number of “S” type rollers to shear the sludge cake, releasing additional water.

  6. Pinch Compressive Dewatering - At the final dewatering, the water content of the sludge cake is further compressed by the pinch rollers at much higher compressive force.

  7. Cake Removal - At the discharge of the press, the cake is scraped off by a doctor blade and is further disposed.


  • Pneumatic or Hydraulic Belt Adjustment

  • 304 Stainless Steel Construction

  • Capacity: 44-264 gpm (10-60 M3/hr)

  • Belt Width: 50-100in


  • 30% of Centrifuge Polymer Use

  • 40% of Centrifuge O&M Costs

  • 10% of Centrifuge Energy Consumption

  • 20% of Centrifuge Capital Costs


  • Automated Tension Adjustment

  • Automated Tracking Adjustment

  • Automated Pinch Rollers