for Powders & Bulk Solids



The Conical Paddle Dryer (CPD) is a universal vacuum dryer, designed for mixing, drying and reaction processes. The unique paddle design of the vertical, centrally driven dryer combines extremely fast drying rates with a compact design.

The Conical Paddle Dryer is a multi-purpose batch dryer, designed to enable vacuum, atmospheric and pressurized processing of a wide range of materials such as powders, granules and filter cakes, especially when they are brittle and/or heat sensitive.


Working principle Conical Paddle Dryer Working principle Conical Paddle Dryer

The Conical Paddle Dryer consists of a conical shaped process vessel, equipped with a central paddle rotor. When it rotates, the rotor creates a combination of vertical and axial motion in the vessel. The paddles guide the product gently to the surface of the batch, where it is dispersed and the gravitational pull at the centre of the dryer forces the product back down to create continuous motion throughout the drying cycle, even at low speed.

The thermal energy required for the drying process is transferred to the product via a heated jacket, which can be heated by various media such as steam, hot oil and water. The jacket ensures rapid distribution of heat into the product in combination with efficient mixing.

The vacuum inside the Conical Paddle Dryer allows vapour to be removed at low temperatures, which makes the Conical Paddle Dryer ideal for drying heat-sensitive products. The vapours are removed through a dust filter fitted on top of the vessel. This prevents the dust from entering the vacuum system.

The Conical Paddle Dryer is equipped with a condenser with a solvent recovery tank. This condenser can be installed before or after the vacuum pump, depending on the properties of the solvents.

The moisture content of the product can be controlled by monitoring the weight of the condensate or by using the Hosokawa Sampler to take samples from the product inside the dryer under vacuum.

  • Key features
    • Batch volumes ranging from 5 to 15,000 litres
    • Compact design
    • Multi-purpose and multi-processing
    • Efficient batch drying of everything from loose powders to heavy pastes and viscous liquids
    • Extremely fast drying
    • Full compliance with international standards such as FDA, cGMP, EHEDG
    • Automated cleaning solutions with our patented CIP filter and CIP skids
    • Sterile processing (SIP) possible
  • Applications

    The Conical Paddle Dryer is designed for vacuum drying solid based materials, but can be used in a wide range of other process applications requiring thermal processing or vacuum treatment of solids, including:

    • Mixing / Drying under vacuum
    • Alkalization, polymerization, solid-gas reactions
    • Cooling of solids and liquids
    • Crystallization
    • Sterilization and pasteurization
    • Thermal processing
    • Wet agglomeration and granulation of solids

    This combination of several processes in one vessel offers tremendous savings on investment costs, labour, and space.

  • Models

    The conical paddle dryer (CPD) is available in several sizes. A few sizes with their typical characteristics are described below. Please note that these values are indicative only. Detailed information is available on request.

    Volume[l]550500100020003000 - 15,000
    Vessel diameter [mm] 300 650 1400 1840 2250 on request
    Outlet diameter [mm] 80 150 300 350 400 on request
    Height incl. motor [mm] 280 713 1178 2657 3125 on request
    Typical motor power [kW] 0.5 - 1 1 - 4 4 - 20 10 - 40 30 - 80 on request

    Laboratory & Pilot vacuum dryers

    Our laboratory & pilot vacuum dryers are small vacuum drying systems that have been specially developed for use in laboratories. They are multi-purpose systems for wide-ranging applications.

    The complete systems, including all of the necessary ancillaries, are built on stainless steel skids with wheels. They are very suitable for process development activities, experimental purposes and for fine-tuning for optimal process parameters. The laboratory dryers are available from 5 litres to 20 litres and the pilot dryers from 40 to 120 litres.

    Standard industrial dryers

    Our industrial dryers are designed and built according to industry standards such as Stoomwezen, PED, TÜV, Lloyd’s, ASME, Afnor, ISPLE etc. and are available in all grades of stainless steel, Hastelloy, etc.

    Bespoke systems

    Our expert design and engineering team would happily work with you on a tailor-made design for any of our dryers or drying systems.

  • Ancillaries

    Our expert design and engineering team would happily help you specify the right ancillary equipment to compliment the conical paddle dryer. These ancillaries may include:

    • Vacuum filter
    • Sampler
    • Heating / cooling skid
    • Ball segment outlet valve
    • Controls
    • CIP / SIP skid
    • Load cells
    • Temperature probe
    • Product level probe
    • Sight glass


As a global developer, manufacturer and 'one-stop shop' supplier of powder processing systems and plants, Hosokawa Micron provides a wide range of both batch and continuous drying technologies. We carefully select, configure and integrate all components and processes in order to ensure the optimal functionality, quality and efficiency of your drying system.

Thanks to our long-standing experience, we are the ideal partner to transform your drying operation into a bespoke powder processing system, from incoming base ingredients to final products.



Test Centre in Doetinchem, the Netherlands Test Centre in Doetinchem, the Netherlands

Our test and process development centre in the Netherlands offers unique possibilities for testing your product to determine the most efficient process, system or plant prior to final design. We can provide laboratory-level as well as production-sized trials. Whether you wish to test a single machine or a complete powder processing system, the same skilled and experienced staff are here to help ensure that you are entirely satisfied with the results.

We offer process equipment and technologies from individual units to large scale bespoke system solutions. Our principle is to deliver high performance yet affordable solutions that meet our customers' demands and long term challenges.

We also have rental equipment available for batch drying.

Energy-saving vacuum dryers

Drying is responsible for more than 15% of energy consumption in modern industrial processes. This makes energy efficiency an important factor when designing a vacuum dryer. Hosokawa Micron is an expert in developing advanced vacuum dryers and we put a lot of our own energy into developing vacuum dryers that will save you energy!

Learn more


To learn more about our powder processing equipment and systems, contact us: