High-Viscosity Mixing. Powerful Kneading. Reliable
Sigma Mixers are designed for high-viscosity, sticky and difficult-to-process materials. Our range includes laboratory kneaders, tilting sigma mixers and sigma mixer extruders, providing flexible solutions from R&D and pilot testing to full-scale industrial production.
Built for demanding applications, Karvil Machinery sigma kneaders can be customized with explosion-proof, heating, cooling, vacuum, PLC control, variable-speed drives and application-specific discharge systems. Available configurations can meet CE, ATEX, FCM and other project requirements, delivering reliable mixing performance tailored to your process.
Choose the Right Sigma Mixer Configuration
From laboratory testing to full-scale production, choose the discharge and configuration that best fits your material and process.
Laboratory Sigma Mixer
For R&D and Small-Batch Testing
Compact laboratory kneaders for formulation development, process testing and scale-up validation.
Working Principle
Loading → Kneading → Heat / Cool → Vacuum → Discharge
Sigma mixer uses two counter-rotating Sigma-shaped blades to continuously compress, fold, stretch and knead the material. This intensive mixing action ensures thorough and uniform processing, even for highly viscous and sticky materials. Heating, cooling or vacuum can be applied during mixing to meet different process requirements.
Why Choose Karvil Machinery Sigma Mixer?
From process design to final configuration, we build reliable kneading solutions around your specific application. Built for Long-Term Use.
Engineering Expertise
Our engineers understand high-viscosity mixing processes and help select the right blade design, speed, heating, cooling and discharge method for your material.
Customized Solutions
From laboratory units to over 6000L production mixers, we customize capacity, blade configuration, heating, cooling, vacuum, speed control and discharge to match your process.
Quality & Factory Testing
We use quality components and proven manufacturing processes, with thorough factory testing to ensure each sigma mixer is ready for reliable operation.
Global Standards & Support
With customers in 50+ countries and regions, we provides responsive technical support, installation guidance and after-sales service from project planning to production.
Optional Features
Final specifications are selected according to material properties, batch size, viscosity, temperature and discharge requirements.
Material: SS 304, 316 or mild steel
Discharging: Tilting discharging/Screw extruding discharging/Bottom valves discharging
Heating: Electric heating with built-in heating system/Jacket for oursoursed water heating or oil heating/Steam heating
Cooling: Jacket for cooling water (optional chiller)
Vacuum: Vacuum pump, buffer tank and connection pipes
Driving system: Powerful motor and gearbox
Independent Control Panel: VFD/ Temperature/Discharging function control
Working Volume: 2L to over 6000L (from lab test to industrial production)
Engineered for Your Process
Every application is different. We configure the sigma mixer around your material, process and production requirements.
01 — Material & Process
We evaluate material properties, viscosity, batch size and processing conditions.
02 — Capacity
Lab, pilot or production scale, from 2L-over 6000L.
03 — Heating, Cooling & Vacuum
Configure jackets, heating or cooling systems and vacuum processing to match your process.
Applications & Industries
Sigma Mixer Projects Around the World
Trusted by Global Manufacturers in 50+ Countries. From silicone to adhesives, see how our Sigma Kneaders are solving complex mixing challenges for industry leaders worldwide.
FAQ
What is a sigma mixer used for?
Sigma mixer is designed for intensive mixing and kneading of high-viscosity, sticky and non-flowing materials such as silicone rubber, adhesives, sealants, resins and composite compounds.
What is the maximum viscosity a sigma mixer can handle?
How do you ensure the quality of the machine before delivery?
Can I customize the sigma mixer?
How about the installation and services?
Let's Design the Right Sigma Mixer for Your Material
Send us your material, batch size and processing requirements. Our engineers will recommend a suitable sigma mixer configuration and provide a customized quotation.