Rubber & Tyre Machinery World

Info on Equipment And Suppliers


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Internal Rubber Mixer: It’s Not as Difficult as You Think

Having trouble comprehending the two types of Internal Rubber Mixers? Well, it’s not as difficult as you think.

Here’s an info sheet that gives you all the critical aspects that you need to differentiate between Intermeshing Type Mixer and Tangential Type Mixer. The Rotors, Configurations, Fill Factor, Position inside the Mixing Chamber, Mixing Nature, Rotor Cooling and Mix Quality all explained in a single page for your ready reference.

Banbury Vs Intermix Info Chart

A Quick Reference Chart on Internal Mixer from Rubber Machinery World.

I hope you will have this handy when you plan discussions for a new or used internal mixer or while addressing purchase selection questionnaire.

Let me know if you found it informative.


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Questionnaire for Internal Mixer Selection

HF MixerLast week, the two-roll mixing mill criterion checklist was amongst the most visited and downloaded posts. It has generated an equally curious interest from our members, as to what similar details should they prepare for discussions with internal mixer supplier.

Hence, here is a quick checklist Internal Mixer Selection Questionnaire for download.

Internal mixers could be either Tangential or Intermeshing Type. Both have their respective advantages and disadvantages when it comes to rubber mixing and the mixer selection will depend on your final product and optimum quality-price trade-off.

Please remember, this criterion identification list is not exhaustive however it is definitely a good start if you are considering an internal mixer purchase. Subsequently, you may evaluate further on the features that the manufacturer/supplier is offering.

Let us know if you found the questionnaire beneficial to initiate a focused discussion with your internal mixer supplier.


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Why Hydraulic Ram in an Internal Mixer?

In internal mixers, hydraulic ram assembly is an apt replacement (over pneumatic ram) because they improve rubber compounding quality.

In pneumatic rams, pressure may vary while the hydraulic version ensures constant, reproducible ram pressure. When you cut compressed air, operating costs reduce because you remove the central compressed air requirement in your plant. You also remove the maintenance issues associated with these air systems in the process. This leads to energy savings in your operations.

A constant pressure from hydraulically actuated rams eliminates variations in ram pressure caused by varying compressed air-supply to the mixers’ pneumatic cylinders. Hence, these are more efficient than air compressors for application of sustained batch-mixing pressure. This in turn, provides consistent mixing process conditions that enhances product uniformity – all of which leads to improved mix quality.

The hydraulic rams can be fine controlled with the hydraulic power. The result is shorter mixing cycles, higher productivity and improved batch-to-batch consistency. Further, the hydraulic ram reduces the noise level within the vicinity of the mixer. So, apart from improving the work environment they use less energy and are quieter in operation.

Representative Image of A Rebuild Internal Mixer

Representative Image of A Rebuild Internal Mixer

In intermeshing type of mixers, cooling water passed through ram provides extra cooling. This control feature is critical when processing heat-sensitive compounds.

Please remember, this is a technology upgrade. Hence, when you choose your tangential and intermeshing mixer, you need to ask for this option. Else, you may continue to receive manufacturer’s standard pneumatic ram only.

Existing pneumatic ram on your internal mixers can be converted to hydraulic ram. Internal mixer manufacturers like HF Mixing Group, Kobelco, Bainite Machines, etc can guide you with energy-saving data for your mixer and offer conversion at an optimized investment.

Let us know if you found this post useful to shortlist energy-efficient features for your next internal mixer purchase.


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Internal Mixers Maintenance Chart

Internal Mixer is a favourite equipment for volume and quality rubber mixing world-wide. These could be Tangential Type Mixer (referred as Banbury) or Intermeshing Type Mixer (referred as Intermix).

HF Mixer

Image from HF Mixing Group

Users buy brand new internal mixers from the manufacturers. Or they get used-machinery from the secondary market. The used-machinery could be either from a trader or from another user. Reputed internal mixer manufacturers include HF Mixing Group, Kobelco, Bainite Machines, Carter, Yiyang etc.

Brand new mixers (and some times old ones too!) come with an Operation and Maintenance (O&M) manual. In such cases, the owner gets comprehensive information on the recommended maintenance practices of the mixer from this manual. Well maintained mixers have longer life, shorter break-down times and gives highest ROI.

In case you do not have the O&M Manual of your internal mixer, here is a template chart of recommended maintenance schedule. You may want to adopt this chart with some customization. Please download the pdf here – Recommended Maintenance Schedule For Internal Mixer

Let us know if you found this chart useful for your internal mixer maintenance.


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