Mass Finishing Driers - Rotary Drum Tunnel


Surface Preparation features a complete line of Rotary Screen Tunnel Driers. Rotary screen driers are ideal for large quantities of small components and especially the drying of cup-shaped parts.

After the finishing process the parts typically are wet and require drying. With a rotary drier the parts are gently dried in a heated drying medium consisting of ground corn cob, ground walnut shells or wood chips.

The parts are transported continuously through a rotating screen drum. The drying of the parts takes place utilizing a heated drying media.

Key features of Rotary Drum Tunnel Driers include:

  • Thermostat control of temperature via electrical heating elements
  • Rotating screen drum for separating the parts from the drying media
  • Automatic return of the drying media to the heating zone
  • Travel, or drying time, is adjustable from 2 minutes to 4 minutes.
  • Continuous operation facilitates linking of the drying process to processing stages prior to and after drying.

Product Specifications for the Walther Trowal DLT Series of Rotary Screen driers:

  DLT 2 DLT 4 DLT 4-HL * DLT 14
Maximum Capacity of parts throughput (lbs / hour) 771 2,204 2,204 6,613
Rotational Drum Speed (RPM) 4.5 3.5 / 7 3.5 / 7 2.5 / 5 & 5 / 8
Barrel Dia x Length (in) 22.8 x 57.4 33.0 x 66.9 31.4 x 70.8 48.0 x 89.7
Screen Drum Dia x Length (in) 18.8 x 21.4 27.5 x 29.7 - 41.7 x 36.6
Screen Drum perforations (in) .23 .23 - .23
Total Weight Empty (lbs) 771 1,812 1,675 4,188

*The DLT-HL is available with one of two hot air blowers allowing the drying of parts with hot air only without utilizing any drying media.

Options available for the DLT series include an extension of the screen drum for removal of drying medium from components with complex cavities, dust extraction, increased heating output and an air knife for removal of dust particles and drying media from parts.

Surface Preparation can assist you with the proper selection of mass finishing driers that best fit your processing and production requirements. Click here to contact Surface Preparation.