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Conical Paddle Vacuum Dryer

The Hywell Machinery conical paddle vacuum dryer is a high efficiency vertical type drying equipment which integrates drying, crushing, vacuum decompression and mixed powder. The HW series conical paddle vacuum dryer have three to five times efficiency of the same specification double cone vacuum dryer. The unique paddle design of the vertical, centrally-driven dryer combines extremely fast drying rates with a compact design. It is a universal vacuum dryer that has been developed to enable vacuum, atmospheric and pressurized processing of a variety of materials such as powders, filter cakes, pastes and viscous slurries, especially when they are brittle and/or heat sensitive.

  • HW
  • 8419399090
  • SUS304/SUS316L
  • Food/Pharmaceutical/Chemical

Conical Paddle Vacuum Dryer Introduction

The Hywell Machinery conical vacuum dryer has a few advantages that make it suitable. It is an extremely gentle dryer/mixer for minimal particle size degradation. Liquids can be dosed in directly into the active zone in a controlled fashion for an even coating across the entire batch. The drying phase is by vacuum with a solvent recovery system to allow for the recovery of the solvents that were used to dissolve the active ingredients.  The discharge from the vessel is from the bottom of the cone by a full port valve, there is no bottom bearing to support the arm which could generate heat or require lubricants in the dryer.  It also allows for the entire batch to discharge quickly with minimal residual material left behind.

Conical Paddle Dryer

Ribbon Vacuum Dryer

Conical Paddle Vacuum Dryer Description

The thermal energy of the HW series vacuum drying machine needed for drying is introduced into the product through a heated jacket that can be heated by various media including steam, hot oil and water. The jacket provides rapid distribution of heat into the product in combination with efficient mixing.

The vacuum inside the dryer allows vapor to be removed at low temperatures, which makes the conical paddle dryer ideal for drying heat-sensitive products. The vapors are removed through a dust filter fitted on top of the vessel. This then prevents the dust from penetrating into the vacuum system.

The conical paddle Vacuum drier is fitted with a condenser with a receptacle for recovering solvents. This condenser can be installed before the vacuum pump, or after it, depending on the characteristics of the solvents.

The moisture content of the product can be taking samples from the product inside the dryer under vacuum.

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

• Chemical reactions: alkalization, solid-gas reactions

• Crystallisation

• Cooling of solids and liquids

Ribbon Vacuum Dryer specifications


Total volume(L)

Operation Volume(L)

Maximum loading (Kg)









HW -400






HW -600






HW -800






HW -1000












HW -2000






1.Hywell   machinery reserves the right to the design without notice

2.All specifications   are as accurate as is reasonably possible, but they are not binding.

Heating method of screw vacuum dryer

For the heating method of the screw blending vacuum dryer, it can use the steam or hot water or heat transfer oil as heat source. However, the above heat sources cannot be provided by end user. Hywell machine can provide electric heating heat transfer oil furnace or electric heating hot water tank. Specific can be designed according to customers.

Condensation recovery unit of screw mixing vacuum dryer

If the material contains a large amount of solvents such as methanol, ethanol, etc. The solvent of raw material can be collected by using a condenser. But the condenser to recollected the solvent that need user to supply cooling water, If the solvent is water or low proportion of solvents , the condenser is not required in order to save investment cost.

Tube model condenser of vacuum dryer

There are two types of vacuum dryer condensers in Hywell company. One is the traditional tube condenser. This condenser is made of seamless steel pipes that arranged inside the condenser cover. The outside of the tube is equipped with cooling fins to increase the condensation efficiency.

Hose wound tube condenser of rotary vacuum dryer

The other is a metal hose condenser. The condenser is undoubtedly a seamless metal hose wrapped inside the condenser. so the same heat exchange area, the outside size of hose wound condensor is smaller than the tube condenser and cost is also cheaper. now Hywell company almost use this kinds Hose wound tube condenser.

Hose condenser

Hose wound tube condenser

mixing vacuum dryer

Tube model condenser

Conical screw vacuum dryer construction material

Hywell Machinery are able to offer our HW series vertical screw vacuum dryer with contact part to be built in SS304, SS316L, Titanium, Duplex stainless steel, etc. Electrical parts of control system of the drying machine can be adapted to the customer’s needs.

How do the Vertical Ribbon Dryer works

The construction of Hywell Machinery HW series vertical ribbon Vacuum Dryer (vacuum mixing dryer ) is very compact: it consists of a cone vessel with the drive unit on the top and discharge valve at the bottom, and a tapered ribbon mounted on the central shaft. In the cone vessel, there is a central tapered ribbon with very small clearance between its edge and the wall, The ribbon moves the materials upward along the vessel wall to the top, where the materials then drop by gravity into the center. During this continuous operation, material particles and heat are exchanged quickly which leads to a homogeneous product. Besides, the material particles are mixed with minimal mechanical and thermal stress, which makes this type of mixer a good solution for fragile and heat sensitive product.

Conical Paddle Vacuum Dryer
Ribbon vacuum Drying Machine

Ribbon Vacuum Drying Machine Advantages

Hywell machinery HW series ribbon vacuum dryer had the following advantages over conventional solutions.

1. Multi-purpose and multi-processing

2. Efficient batch drying of loose powders to heavy filter cakes and viscous liquids

3. Compact design

4. The working process of drying machine use intermittent operation, after the wet materials enter into the stock bin, through the wall jacket to heat and dry the materials. transmission shaft heating is also available, which can heat more sufficiently.

5. Hywell company specially designed this equipment for processing the slurry materials, high viscosity and high-moisture material, meanwhile, the solvent from the material needs to recovery.

6.High efficiency:The machine is set for drying, mixing and distillation in one of the efficient multifunctional closed vertical vacuum drying equipment complied with GMP requirement. its drying efficiency is as 3-5 times as the same specifications of other dryer.

7 .High mixing precision:It can reach high mixing uniform, Even mixing of different density and different particle shape material in the same batch of products, can achieve the required mixing precision in our machine. Even adding very litter materials in a large quantity of materials, the machine can reach perfect mixing uniform.

8. Low shear strength stirring:It adopt low shear strength stirrer, which can gently mix the materials with low speed rotary and energy consumption. the mixing strength and time not much.

9.Sealed design:The machine is total sealed design with all the connections include the loading and discharge nozzle fixed, which can fulfill the requirement of the materials and safe environment.

10.Energy saving: Compared with traditional drying equipment, for example, bipyramid vacuum drying machine, tray vacuum drying machine, hot air oven and so on.

1). In the same condition of volume, charge materials can be increased more than one time.

2). In the same condition of energy consumptions, it can be increased to two times to five times in drying production.

3). Drying time is less than one third of traditional drying machine such as the Rota cone vacuum dryer, vacuum shelf dryer.

Vacuum Mixing Drying Machine Options

1. Ribbon Design:

We offer several types of spiral ribbons for different sizes and applications.

2. Construction Material & Sanitary Finishes:

We are able to offer our Ribbon vacuum dryer with contact part to be built in Carbon steel, SS304, SS316/316L, Titanium, Duplex stainless steel, etc. Standard of internal and external finish can be adopted to the customer’s needs. Multiple types of finishes are available also, including sanitary type & even electro-polishing with proof of passivation.

3. Feeding & Discharge Options:

Screw vacuum dryer can have a variety of feeding & discharging methods that match the demands of the filling & production line.

4. Drive Systems:

Ribbon drying machine have a drive system by geared motor, cycloidal reducer, worm reducer, belt or chain transmission, etc.

5. Heating & Cooling Jackets:

Ribbon vacuum dryer are available with jackets for heating / cooling operation.

6. Custom Engineered Dimensions:

Dimensions of our conical screw vacuum dryer can be defined according to customer’s requirements.

7. Ribbon Mixer Sizes:

Screw vacuum drier from 100 to 5000 lit. total volume with bigger size as per request &. more.

blending vacuum dryer

Vacuum sampler

ribbon mixing vacuum dryer

Pneumatic discharge valve

Conical Paddle Drier Application:

Conical Paddle Drier is widely used in pharmaceutical, chemical, foodstuff and electronic industries.

The machine is suitable for vacuum mixing and drying of power and granule raw materials of pharmaceutical industry, chemical industry, foodstuff industry etc. Particularly it is suitable for row materials that have the follow requirements:

1.Themal sensitive raw materials that cannot be dried at high temperature.

2.Raw materials that is easy to oxidize and dangerous.

3.Raw materials that solvent and toxic gas.

screw vacuum dryer
Vertical Ribbon Dryer

Vacuum Mixer Dryer Video

conical vacuum dryer


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