Advantages of the Twin Shaft Paddle Mixer
The twin-shaft paddle mixers have many advantages. These mixers are very gentle with the products, have low energy consumption, high capacity, little space requirement and flexible filling. The advantages are detailed as follows:
Short Mixing Time
Mixing takes place in a very short time. An average mixing cycle for dry mixing can be as follows: filling 20-30 seconds, mixing 40-60 seconds and discharging 10-20 seconds. This gives a total cycle time of 1.5 – 2 minutes.
Because of the short mixing time, a relatively small twin-shaft paddle mixer will deliver a large output – thus resulting in savings, both in investment costs and space requirements.
Shear is very low, virtually non-existent and therefore no heat is generated during mixing. As a result extremely fragile materials such as flake or whole coffee beans can be mixed with minimal degradation.
No Segregation of Materials
Homogeneous mixing is achieved in the space of a few seconds because of fluidization of the material. Since the mixing forces are stronger than the forces of segregation, all types of particle shapes, sizes are easily mixed without segregation. Segregation may take place in the post-processing operations, if any. It is therefore recommended that the distance between the mixer and the final packaging point should be minimized to avoid segregation.
Lower Production and Maintenance Costs
The benefits of the mechanical fluidizing zone are gentle mixing, no segregation and very short mixing time. This gives savings in terms of minimal wear and tear and low energy consumption. Maintenance costs are also very low. The mixer’s low energy consumption is an important consideration in reducing production costs. Batch type mixer are generally powered by motors of 15 kW/m3 of working capacity.
Micro-minors of 1 ppm (parts per million) are mixed regardless of where they are added into the mixer. The construction and operation of the twin-shaft paddle mixer ensures that there are no dead spots within the mixer.
Maximum Material Discharge
Unlike other horizontal mixers, blenders where some percentage (generally 2 to 3%) of material may remain in the mixer at the time of discharge, the bomb-bay door design in the twin-shaft paddle mixer facilitates almost complete discharge of material.
Easy Cleaning of Mixer
Side access doors for entry into the mixer interior can be provided. These also provide access for cleaning the mixer internals after completion of the batch. Because of the maximum material discharge and the option for side access doors, this mixer is preferred for pharmaceutical and food applications.
Liquids can be added easily to the powder mixture. The mixer can therefore be used to produce formulations. The pin-mill and the chopper options ensure that no agglomerates remain in the mix mass.
Reliable Scale Up
The simple design and mixing principle ensure that lab test-results can be reliably scaled-up to production levels.