A better dryer for your application

Dupps Airless Dryer This innovative new design features superheated steam at atmospheric pressure as the drying medium. This Dupps Airless dryer is notable for dramatic reductions in air pollution and process odors with higher product quality. See More.

The QuadPass® Rotary Drum Dryer offers dramatically better dryer performance than traditional single- and triple-pass rotary drum dryers. Lower voc emissions, better product color, more uniformly dried product and reduced fire danger are just some of the advantages of the patented four-zone QuadPass rotary drum dryer. See more.

Dupps Ring Dryer This flash dryer grinds, dries, conveys and produces heat ...all in one system that handles any material that can be entrained, but won't stick to duct work during drying. See More.

Why the Dupps QuadPass Dryer is so much better than other drum dryers.

Ordinary three pass drums (upper diagram) can over-dry. Material starts drying at high air velocity then drops at each stage, so particles can accumulate, overheat and clog.
The QuadPass™ Four-Zone Rotary Drum Dryer (lower diagram) starts at the slowest velocity, then gets progressively faster. This dries each particle of material at its individual drying rate, regardless of size, density or moisture. Dried particles exit the drum without overheating or volatilizing.

Your existing dryer with a QuadPass rotary drum can be your fastest and most economical way to improve product quality, increase production, and reduce emissions. If your current drums are broken, burned, worn out, or don't meet production quality or quantity, we can replace any size, make or model with a new state-of-the-art QuadPass drum using the same footprint.

The Dupps Airless Dryer offers a number of important operational benefits over conventional hot air dryers: 

• There is minimal risk of in-drum fires because of the oxygen-
starved environment.

• It's an indirect heated dryer—the products of combustion are isolated from the process loop of the dryer.
• Minimal odor control equipment is needed.

• There is no visible plume of dryer exhaust.

• The dryer's exhaust is essentially water vapor, which can be
condensed to recover thermal energy and used
elsewhere in the plant.

• No pressure vessel is required because the dryer operates at
atmospheric pressure. 

• Exhaust volume is much less than comparable heated air dryers.
So if an RTO is used, it will be considerably smaller, and less
Download Airless Dryer brochure.

The revolutionary QuadPass dryer is an ideal solution for
agribusiness, forest products, municipal & industrial wastes and many other applications.

It's unique, patent-pending design provides lower VOC emissions, more uniform drying, better product color and reduced fire danger compared to conventional single- and triple-pass rotary drum dryers.

Complete turnkey systems include everything your application requires -- burners, material feeding and conveying equipment, recycle air systems, high-efficiency particulate collectors, and state-of-the-art PLC controls. Download QuadPass brochure.

Because it exposes the material to heat for only a few seconds, the Ring Dryer gives you a cooler product, ready to bag or store, with accurate moisture content and no wet spots. And because it recirculates 50% of the heated drying air, you save on fuel costs.
  • Recirculating the heated exhaust air reduces odor
control costs.

 • Short exposure to heat retains product digestibility
and lysine bioavailability.

 • Product has light, uniform color.

 • Available in an airless configuration.
Download Ring Dryer brochure.

Service is our most important obligation.
Our staff of full-time Field Service Technicians is expert in every aspect of maintenance and repair of processing equipment including welding capability that meets ASME Code Section VIII requirements. With all the specific tools necessary to maintain, repair and upgrade Dupps and other kinds of machinery properly and efficiently, we can quickly bring your system and equipment up to peak efficiency with a minimum of downtime.

The Dupps Parts Department, with a full inventory of maintenance and repair parts, stands ready for the fastest possible response, often within twenty-four hours of a call. Because replacement part availability is critical — even a small, inexpensive part can shut a plant down — our customers can call Dupps twenty-four hours a day, seven days a week.