Drais Star Disperser
Dispersing in Batch Operation

The first choice for demanding unit operations

• Solid-Liquid mixing
• Deagglomeration
• Micro-dispersing
• Dissolving
• Homogenizing
• Paste production

Applications: Mixing pastes, breaking down agglomerates dissolving, dispersing, emulsifying and homogenizing viscous materials, such as primers, paints and printing inks, pigmented coating compounds, plastic pastes, ointments, creams photographic emulsions, adhesive and resin solutions, etc.

System Advantages: Outstanding dispersing performance and uniform fineness through intensive shearing action of the new rotor-stator impeller, featuring a patented external pinned ring rotor. Almost vertical flow of the circulating materials effects rapid entry of fine powdery constituents into the batch. Drastically reduced mixing times. Minimum heating of the batch. Low energy consumption. Simplified operation and processing. Simple servicing and maintenance. Central control panel with indicators for all machine functions. Automatic central positioning of change can.

The newly developed Drais Disperser ideally combines the proverbial Drais sturdiness and longevity with innovative process technology and control features. In three machine sizes drive powers of 11 to 132 kW are supplied for vessels of 150 to 6000 liters. The speed variation by electronic frequency inverter control is included as standard feature even in the basic equipment.

Dispersing implements made to measure Depending on the specific requirements of the application Drais Disperser can be equipped with different dispersing implements:



The toothed disc
Innumerable industrial standard applications like paints and lacquers, printing inks and chemicals would be unthinkable without the toothed disc as a simply constructed yet highly effective dispersing implement.

The Drais STAR Impeller
The STAR impeller consists of Drais specific arrangement of rotor and stator pinned discs. The stator disc pins, which are arranged parallel to the axis, are surrounded at a close distance by the rotor disc pins located outside. Due to the external rotor arrangement, the DRAIS STAR technology achieves an intensive product circulation, in which the total batch participates evenly. Segregation in the vicinity of the vessel wall is excluded. By the suction effect of the rotor disc the dispersing product is sucked first axially downwards and then radially outwards through the pinned ring stator. Between the stator and rotor pins the product is exposed to a high frequency shearing with a shear rate of up to 7000 s1. Due to the load in defined shear gaps, even agglomerates, which are difficult to disperse, are effectively disintegrated and micro-fine dispersed with highest solids concentration.

The decisive advantages:

• Superior quality by application-specific dispersing implements
• State-of-the-art electronic drive technology
• Drastically reduced dispersing time for more economic efficiency
• A large variety of additional equipment

With a Drais Disperser, the continuous speed adjustment from 0 min1 to the maximal stirring shaft speed is realized as standard feature by a maintenance free frequency inverter control. The frequency inverter, PLC and the further control components are accommodated in a separate switch cabinet in the non-ex zone. The maximal speed desired for a dispersing process is pre-selected by a rotary type plus/minus switch. With initially cold and therefore particularly viscous product the dispersing automatic n-tronic adjusts the speed value at which the nominal motor current is just not exceeded. With decreasing motor current or reduced power consumption because of lower viscosity the stirring shaft speed is automatically increased. Drais Disperser is constantly operated with maximal power consumption without exceeding the pre-selected limit speed. The result: Better dispersing quality in a shorter time.

Central vessel clamping
Irrespective of what vessel size you use, with the new Drais vessel-clamping device the disperser shaft always remains in the center. The precise parallel guidance of the clamping jaws results from the purely vertical circular movement of the hydraulically operated gripper-type system.