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When it comes to producing syrups, gels, pastes, and adhesives at scale, high-viscosity mixing is one of the most demanding stages in commercial manufacturing. Used across the food, beverage, pharmaceutical, cosmetics, paint, adhesive, and chemical industries, these products require reliable shear and circulation to achieve uniform texture, stable performance, and repeatable batches. However, mixing high viscosity products can be very challenging. Manufacturers often struggle with poor flow and “dead zones,” trapped air, stubborn clumps, and uneven dispersion of additives, all of which extend mix times, drive rework, and compromise product quality. Because thick products resist movement and don’t self-level like low-viscosity liquids, mixing technique and equipment selection are critical to achieving a smooth, consistent result.
In fluid dynamics, high viscosity means the fluid has a lot of “internal friction,” so it resists moving and changing shape. It flows more smoothly and slowly (less swirling and turbulence), and the effects of drag and sticking to surfaces become much stronger than the fluid’s momentum.
High-viscosity fluids are challenging to process because their resistance to flow restricts bulk circulation and suppresses turbulence. As a result, mixing performance becomes highly dependent on how effectively you generate both flow (to move material through the vessel) and shear (to disperse and homogenise), with poor design leading to long cycle times and inconsistent batches.
Limited bulk circulation (poor turnover)
Thick fluids don’t readily “roll” through the vessel, so material can remain under-processed for long periods. The result is longer mixing times and greater sensitivity to impeller selection, placement, and vessel geometry.
Dead zones and stagnant regions
High viscosity amplifies wall effects and creates areas where velocity drops to near zero—typically in corners, near the surface, or behind baffles. These zones drive batch inconsistency, leaving concentration and viscosity gradients even after extended mixing.
Localised shear and incomplete dispersion of additives
In viscous systems, most of the mixing action occurs close to the impeller, while the bulk sees relatively low deformation. Powders and viscous liquids can wet-out unevenly, forming agglomerates or “fisheyes” that persist and require rework.
Air entrainment and poor deaeration
Thick products can trap air introduced during charging or agitation, producing foam, density variation, and appearance defects. Once entrained, bubbles are slow to rise and escape, so managing surface vortexing and feed points becomes critical.
Mixing high viscosity products (such as gels, syrups, creams, sealants, and adhesives) can often be challenging as they resist flow and suppress turbulence. That often leads to poor batch turnover, dead zones, air entrainment, and inconsistent dispersion of ingredients, especially when using conventional tank agitation that relies heavily on bulk circulation.
The Mixquip High Shear range overcomes these limitations by applying targeted rotor-stator shear and (where required) inline recirculation, so you’re not dependent on mixing longer to achieve uniformity.
Instead of trying to force a thick product to behave like a low-viscosity fluid, Mixquip high shear systems focus on controlling where the energy goes and repeatedly processing the full batch through a defined high-shear zone:
2. Creates controlled recirculation for reliable batch turnover (inline operation)
Mixquip inline high shear mixers are commonly used to recirculate product to and from a process vessel, helping eliminate stagnant regions and ensuring the bulk material is repeatedly processed rather than only the zone near an impeller.
3. Improves incorporation of powders and additions (where required)
For formulations that include powders or granules, the Mixquip Series 620 adds solids directly into the liquid stream and then applies high shear dispersion to minimise issues like floating, dusting, and clumping, common failure modes in viscous systems.
4. Delivers process flexibility and repeatable control
The range includes batch and inline configurations, with speed and power control and robust construction for industrial duty. Batch mixers can also be configured with interchangeable work-heads to suit different products and stages of processing, improving versatility without changing the whole machine.
Agglomerates and fisheyes form when: ingredients enter a thick, slow-moving fluid and are not immediately surrounded and separated by liquid. The outside wets first, a skin can form, and the dry or concentrated core stays trapped inside. In high-viscosity products, limited circulation then allows these defects to persist and show up as grain, soft lumps, or texture variation. The Mixquip High Shear range prevents this through:
Immediate wetting in a high-velocity zone where particles are rapidly surrounded by liquid instead of sitting and slowly soaking.
Rotor-stator shear dispersion so partially wetted clumps are mechanically opened and broken down before they can stabilise.
Consistent re-processing via recirculation so the entire batch passes through the high-shear zone, not just the region near the mixer.
Controlled addition at the point of highest energy so materials are introduced where dispersion is strongest, reducing the chance of surface skins and persistent lumps.
To mix high-viscosity products successfully, the batch must be:
Driven into strong, deliberate circulation
Processed through targeted high shear energy
Turned over repeatedly to eliminate dead zones
This is why conventional agitators and standard tank mixers often fail, as thick fluids suppress turbulence and restrict flow, so the energy stays local and the bulk product never fully homogenises.
Mixquip’s High Shear range is engineered for demanding high-viscosity processing where conventional agitation struggles to generate sufficient circulation and dispersion. The technology behind Mixquip High Shear mixers uses intense rotor-stator shear forces and controlled recirculation to achieve:
Agglomerate and clump breakdown
Smooth, uniform texture development
Reduced air-related defects through controlled processing
Repeatable batch consistency and viscosity control
If high-viscosity mixing is slowing your production down, driving rework, or compromising batch consistency, it’s time to upgrade the way shear and circulation are applied. Talk to Mixquip about the right high shear configuration for your product and tank, and we’ll help you achieve faster processing, smoother texture, and repeatable results. Enquire today to discuss your application or arrange a demonstration.
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