We are independent & ad-supported. We may earn a commission for purchases made through our links.
Advertiser Disclosure
Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.
How We Make Money
We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently of our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What Is Drum Drying?

By Marlene Garcia
Updated May 16, 2024
Our promise to you
DelightedCooking is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At DelightedCooking, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject-matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

Drum drying defines a process used in the food industry to remove moisture from pastes, purees, and liquids with rotating, heated drums. The procedure converts wet food products into flakes or powder that can be rehydrated by the consumer. Drum drying uses a precise combination of steam pressure, temperature, rate of rotation, and thickness of product to retain flavor and color.

Food manufacturers typically use drums to make potato flakes, powdered milk, baby foods, dehydrated soup mixes, and some breakfast cereals. The process might also convert apples to apple sauce, but drum drying fruit presents a challenge because of its high sugar content. Drum drying preserves ample starch, along with additives and stabilizers, in the production of instant mashed potatoes.

Potatoes are washed and peeled as the first step in the dehydration process. They are then sliced and cooked to create a paste. The puree is applied to the outer surface of an internally heated drum to remove most of the water content. Usually, moisture evaporates within seconds, allowing removal of the end product from the drum via scrapers.

Equipment used for drying typically employs one or two cylinders made from stainless steel or cast iron that rest on a frame. Depending on the intended use, dryers can be purchased with single drums, double drums, or twin drums. Single and double drum dryers are most commonly used in fruit and vegetable dehydration.

Single drum drying, usually used for potatoes, feeds the puree on to the outside of the drum. Double drum drying employs two cylinders that rotate toward each other and is commonly used to make tomato paste. The distance between the drums determines the thickness of food layers. Twin drum dryers rotate away from each other, which controls dust during the food drying process.

A vacuum drum dryer operates in a similar fashion, but uses low temperatures for foods that might be damaged by extreme heat. Drums on this type of equipment are sealed inside a vacuum chamber and represent a form of dehydration considered expensive. Steam drum drying represents a more efficient method of dehydrating food products.

Drum drying came into use in the 1990s before spray drying techniques were developed. Spray drying exposes food with high moisture content to hot air inside a machine that rapidly removes water. These newer machines permit temperature adjustments for different types of foods and the size of particles desired.

DelightedCooking is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Discussion Comments
By anon250070 — On Feb 24, 2012

How can we control the temperature of the surface of a double drum rolling dryer?

DelightedCooking, in your inbox

Our latest articles, guides, and more, delivered daily.

DelightedCooking, in your inbox

Our latest articles, guides, and more, delivered daily.