Kneader Mixer

Sigma mixers are particularly suitable for materials that become too viscous, sticky, dense, or heavily filled for conventional agitators. Typical applications include silicone rubber, rubber and plastic compounds, adhesives, sealants, BMC/DMC, carbon and electrode paste, graphite compounds, gum base, chewing gum, dough, modeling clay, putty, and other high-viscosity formulations.
The right setup still depends on how the material behaves during mixing. Factors such as filler loading, temperature sensitivity, air entrapment, abrasiveness, and discharge difficulty can all affect the final mixer configuration.

The correct capacity should be based on the actual batch and production target, not vessel volume alone.
We normally consider the material density, batch weight, recommended filling level, expected mixing time, required daily output, and the way the mixer fits into the rest of the production process. For example, two customers producing the same material may need different mixer sizes if their batch cycle or daily output targets are different.
If you only know the required output and are unsure about the mixer volume, HengMing can work backward from your production requirement to recommend a suitable capacity.

HengMing sigma mixers are available from 0.25L laboratory units up to 10,000L industrial systems.
The smaller 0.25L–10L range is mainly used for formulation development, material trials, research, and process validation. Larger machines from 20L upward are designed for pilot production and industrial manufacturing, with the drive system, power, discharge method, and other configurations matched to the material and required output.
For very large capacities, the machine is engineered according to the specific process and production conditions rather than simply enlarging a smaller standard model.

A vacuum kneader, also commonly referred to as a vacuum sigma mixer or vacuum mixer, is useful when trapped air, bubbles, moisture, or volatile components can affect product quality or downstream processing.
It is commonly considered for products such as sealants, adhesives, silicone compounds, pastes, and other formulations where deaeration is important. However, high viscosity alone does not automatically mean that vacuum is necessary.
Whether a vacuum system should be included depends on the formulation, the required final product condition, and the process you are currently using.

Yes. Depending on the process, a sigma mixer can be configured as a heated kneader, a cooled kneader, or a system capable of both heating and cooling.
Temperature control may be needed to soften a material, control viscosity, support dispersion, maintain a reaction or processing temperature, or remove heat generated during intensive kneading. The suitable heating or cooling method depends on the target temperature, material characteristics, batch size, and available utilities at your plant.
Heating or cooling is specified from the actual temperature range and material behavior, not simply added as an option.

With a hydraulic tilting discharge kneader, the batch is emptied by rotating or tilting the mixing chamber. This relatively simple discharge approach works well for many materials that can leave the chamber without excessive resistance.
A screw extrusion kneader uses an extrusion screw to push highly viscous or sticky material out of the mixer in a more controlled way. It is often preferred when manual discharge is difficult or when the material needs to feed directly into a downstream process.
The better option depends on material consistency, batch size, required discharge speed, cleaning requirements, and what happens to the material after mixing.

Yes. When there is uncertainty about whether a formulation is suitable for sigma mixing, or when the customer is still developing the process, a pre-order material trial can be arranged.
During the trial, the focus is not only on whether the material can be mixed. We can also observe how the material changes during kneading, whether heating or vacuum may be necessary, how easily it discharges, and what equipment configuration may be more suitable for scale-up.
The test process can be documented with photos and videos so the customer can review the result remotely before making the final equipment decision.

Yes. A sigma mixer should be configured around the material and production process rather than selected only by capacity.
Depending on the application, the machine can be adapted in areas such as blade design, drive system, motor power, speed control, heating or cooling, vacuum, discharge method, material-contact surfaces, control system, and downstream integration.
Customization should solve a process requirement, not make the machine more complicated. Every option is selected for a reason — how your material mixes, discharges, or fits into production.

Before final payment, HengMing carries out machine testing and prepares a PDI package for the customer to review.
Depending on the project, the PDI can include the machine configuration, functional testing, operating condition, photos, videos, and other order-specific inspection items. You review the evidence and confirm that the machine meets the agreed requirements before arranging the final balance.
This gives the customer a clear verification point between machine completion and final payment, rather than relying only on specifications or sales promises.

For overseas projects, HengMing provides a 12-month warranty starting from the machine’s arrival at the destination port.
If a non-human-caused component failure occurs during the warranty period, the required replacement part is provided free of charge, while international freight is borne by the customer. Remote technical support and repair guidance are also available.
After the warranty period, HengMing continues to provide technical support and spare parts on a long-term basis. Remote commissioning is available, and on-site installation or operator training can also be arranged when required.