There are three main kinds of freeze dryers: rotary, manifold and tray freeze dryers. Rotary freeze dryers are generally used when working with liquids. Small amounts of material are frozen by manifold dryers, and tray freeze dryers produce the driest product ready for long-term storage. Read More…
Dürr is a leading global supplier of environmental solutions and engineered products tailored to meet customers' industrial process requirements. We offer a complete portfolio of air pollution control technologies and drying and curing systems, including industrial dryers and ovens for roll-to-roll processes, web forming processes and conveyor handling of webs, as well as specialized coating...
The CMM Group provides custom-designed industrial dryers and ovens for a wide range of applications in single or multi-zone configurations. The CMM Group designs and builds conveyorized curing, baking and drying ovens for automated production of small-to-medium sized products. Conveyorized roll support web dryers are available in horizontal or vertical tower design and can handle thin film to...
C.A. Litzler has been around for over 60 years and during that time we have built lasting relationships with our customers. We have become one of the most trusted names in the industries that we serve because of our dedication to our clients and to quality products. Over the decades, we have expanded into other industries and introduced new technologies along the way. Our products include carbon...
At Vulcan Drying Systems, we specialize in designing and manufacturing high-quality industrial dryers for a wide range of applications. With our years of experience in the industry, we have become a trusted name in the drying systems business, delivering efficient and reliable solutions to clients worldwide.
Buhler is a global leader in thermal processing technology. Aeroglide dryers, roasters, toasters, ovens, and coolers are recognized worldwide for superior airflow design, sanitation, and high-quality construction. These elements combine to maximize return on investment. Call Buhler or visit their website today!
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Freeze Dryers - Central Air CompressorFreeze dryers are used by the pharmaceutical industry for increasing the shelf life of vaccines, for preserving certain strains of bacteria and for ease of storing and shipping certain products.
Freeze drying removes water and bulk while maintaining flavors and nutritional content and is subsequently used with food and beverages like instant coffee, fruit and herbs. Freeze drying is also useful in chemistry and biotechnology because it can make products easier to dissolve in water and remove impurities. Some museums or conservation agencies use freeze dryers to dry and preserve artifacts, manuscripts and animal or floral specimens.
Freeze Dryers - Central Air CompressorThe three kinds of freeze dryers - rotary, manifold and tray - vary in size and material. The industrial machines are typically tray freeze dryers and can be hundreds of feet long, either vertically or horizontally oriented. Stainless steel is most commonly used because it is sanitary and can be temperature controlled very effectively.
Products are held on trays on shelves in large boxes or carried on a conveyor belt if the dryer is continous. Freeze drying is a three step process. During the initial freezing, the material inside the dryer is cooled below its triple point, which is the lowest temperature at which the solid and liquid phases of the material can exist at the same time.
The temperature is usually between -50° and -80°C, and this is the most important step of the process. After the material is frozen it enters the primary drying phase. The pressure is lowered and enough heat is provided that sublimation occurs. Adding a vacuum to the dryer helps control and maintain pressure, and a cold condenser plate or chamber gives the water vapor a surface to freeze onto after it leaves the material.
The last step removes any unfrozen water molecules. In the secondary drying phase the pressure is lowered again and the temperature is raised, sometimes above the freezing point of 0°C. Any residual water evaporates from the substance, and the final water content is less than 5%.
