(STL.News) A high viscosity mixer is the solution for inconsistent mixing of thick materials. It solves major challenges for lab workers, ensuring reliable results. IKA offers top-range mixers that meet your all-around mixing needs. Here is a comprehensive guide to help you choose the right mixer.
High-Viscosity Mixing Challenges
High-viscosity liquids need a higher torque to mix evenly. This presents a challenge for standard mixers.
Dead zones
Thick materials often fail to circulate properly in standard vessels. There are dead zones in the corners or at the bottom. This leads to inconsistent batches.
Resistance
Viscous fluids usually have high internal friction. They are much harder to mix evenly. This means only the materials near the blades are stirred. The rest of the batch remains unmixed.
Trapped air
Because of their thickness, air trapped in high-viscosity liquids can’t escape without the right tools. This can ruin the clarity and result reliability.
Key Specifications to Consider
When you choose a lab mixer for viscous liquids, RPM is not the only factor to consider.
Torque
It determines the mixer’s ability to handle viscous resistance. For high-viscosity applications, you will need high-torque overhead stirrers.
Viscosity capacity
What is the maximum mPas the equipment can handle? And what is your need? You don’t have to go overboard and get the most powerful type. But you should also calculate your research needs carefully, so you can get an adequate one for your lab.
Impeller type
Depending on your research projects, you should select the appropriate impeller type. Axial mixing, which is in vertical motion, offers very different results from tangential mixing, which is in circular motion.
Types of Laboratory Mixers for High-Viscosity Applications
If you are unsure which high-viscosity mixer to get, contact experts like IKA for personalized advice for your lab.
Overhead stirrers
It is the best type for high-viscosity applications overall. Its high torque is suitable for large volumes and thick materials. It is ideal for thick liquids, adhesives, and gels.
Rotor-stator homogenizers
An effective high-shear industrial device. It is used when high shear is needed to break down particles or create stable emulsions. Rotor-stator homogenizers are very common for industries like cosmetics for mixing lotions.
Impeller add-ons
Aside from choosing the right mixer, the blades are also essential. Choose from different impeller types for your research purposes.
Scale and Batch Size Considerations
A lab mixer for viscous liquids has to fit your operational scale and batch size.
Small scale
For smaller labs, you could get away with magnetic stirrers for small volumes and batch sizes. Although magnetic stirrers are ineffective for high-viscosity liquids on industrial scales, they remain a great, affordable option for medium-viscosity liquids.
Medium scale
If you are scaling up, overhead stirrers are preferred. They are much more powerful and stable for thick or dense mixtures. You can have sufficient control over the speed and mixing quality.
Industrial scale
For commercial scale, you will need specialized overhead stirrers. They usually come with real-time monitoring and feedback. You can make adjustments and observe the process more accurately.
Additional Features and Accessories
Aside from the mixer itself, you can add features and accessories to tailor the laboratory mixing equipment to your needs.
Software integration
Incorporate your lab tools with a central monitoring or management system. It facilitates real-time management and data transfers among different research centers. It enhances reproducibility and reliability.
Safety features
Every mixer will come with basic safety features, such as an emergency shut-off. However, you can still add various safety features to further protect the unit.
Accessories
From impellers to additional screens to sensors, there are many practical add-ons available. These accessories are needed for different experiments.
Evaluation and Testing
Here are a few starting points to keep in mind when designing an experiment.
Define the experiments
You must clearly define the goals and equipment needed for the experiments. Are you aiming to test a theory? Or are you aiming to produce an FDA-approved product? Your goals will determine the tools and specifications needed for the process.
Trial batches
Before you scale up, it’s critical to first run a few trial batches. It provides basic testing that your theory is solid and that you can move forward with the process.
Documentation
Every step should be clearly documented for traceability. It allows researchers to locate errors and adjust the experiments more easily.
In conclusion
Mixing viscous liquids has always been a challenge for researchers. Without the right tools, it is difficult to achieve usable results. You should choose a mixer for viscous liquids that meets your production needs.
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