Dynamic mixing system (dynamix)

Dynamic mixers are generally used to process multi component materials if

  • there is a significant difference between the volumes of the different components to be mixed, as an example, a mixing ratio of 100:5
  • the viscosities of the components to be mixed are very different
  • the mixed material has a very short pot life
  • very low flow rates are required

Construction

DOPAG dynamic mixer is compact in construction and is available with 5 different mixing chamber volumes. The rotor situated in the mixing chamber can easily be disassembled. The valve connections can be swivelled so that the optimal hose direction can be chosen. The inlet valve of the A component has been positioned such that it is impossible for mixed material to come into contact with the rotor seals. This confi guration not only increases the protection of the rotor seals but also increases the functional security of the dynamic mixer.

Mixing Chamber

The volume and characteristics of the mixing chamber depend on the flow rate and miscibility of the material. The material inlet valves are mounted onto the mixing chamber at a specific angle so as to be flush with the inner surface. This arrangement helps to avoid dead space where air bubbles or the remainders of mixed, undelivered material could accumulate.It is important to ensure that the mixing chamber is completely exhausted during the metering process to prevent material from dripping after metering has finished.

Valves

Depending on the application conditions and flow rates the dynamic mixer can be fitted with different sizes of inlet valves. They are all made of stainless steel. If required this mixing system can be fitted with recirculation valves. With this configuration, the material can be kept in motion by means of a bypass, which minimises the risk of failure since the mixing ratio remains controlled and pressure drops are reduced. In addition, the bypass has the advantage that any possible sedimentation of fillers can be avoided. Optionally, the working position of each of the inlet valves can be monitored by use of a sensor.

Technical Specifications

  1. Flow rate

    20 - 900 cm³ / min.

  2. Mixing ratio
    100:100 - 100:5
  3. Viscosity ratio A to B
    100:2, min. < 20 mPa s
  4. Volume mixing chamber
    2, 4, 6, 8 or 16 cm³
  5. Internal diameter, valves
    1, 2, 4 or 6 mm
  6. Drive

    Pneumatic motor up to 4.000 -1
    Servo motor up to 3.000 -1

  7. Dimensions
    approx. 174 x 300 x 367 mm
  8. Weight

    approx. 11 - 15 kg,

    depending on configuration

  9. Air pressure
    6 bar

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