Sigma Batch Mixer

The Sigma Batch Mixer, also known as the Lab Sigma Mixer, is a robust industrial mixer designed for high-viscosity batch mixing applications. It is widely employed in research laboratories, pilot plants, and small-scale production across pharmaceutical, chemical, food, polymer, and specialty materials industries.

At HiTechTrader, we offer the Sigma Batch Mixer (Lab Sigma Mixer) as a reliable pre-owned and refurbished solution for laboratories and pilot plants requiring efficient high-viscosity batch mixing. Designed with dual counter-rotating sigma blades in a stainless steel U-shaped trough, the mixer delivers powerful shear and kneading forces to process adhesives, pastes, slurries, resins, doughs, and other viscous materials with consistency. With working capacities from 5 to 50 liters, optional jacketed troughs for heating or cooling, and discharge options ranging from manual tilting to automated systems, the Sigma Mixer is versatile enough to support pharmaceutical, food, polymer, cosmetic, and specialty chemical applications. Its robust 316 stainless steel construction, sanitary design, and customizable features such as vacuum mixing, spray injection, and explosion-proof configurations make it a dependable choice for precise and uniform dispersion in demanding R&D or small-scale production environments.

General Description

The Sigma Batch Mixer is equipped with two sigma-shaped blades that rotate in opposite directions within a U-shaped trough. This counter-rotating dual rotor design generates powerful shear and kneading forces, making it ideal for mixing viscous pastes, dough, slurries, and other challenging high-viscosity materials.

It can handle batch sizes ranging from as small as 5 liters up to 50 liters or more depending on the model configuration.

The construction is typically stainless steel 316, offering superior durability, chemical resistance, and hygienic performance required in pharmaceutical and food industries. Surface finishes can be provided as mirror-polished or matte depending on process needs.

1. Working Principle
   
   The twin sigma blades rotate counter to each other, continuously pulling material through the trough and kneading it against the chamber walls.
2. This creates a combined effect of bulk flow, shear, stretching, and folding, ensuring a thorough dispersion of ingredients regardless of viscosity.
3. Blade and trough design maintains minimal clearance to prevent buildup or dead zones, ensuring uniform and consistent mixing.

1. Construction and Features
   
   The U-shaped trough can be supplied with a heating or cooling jacket for precise
   temperature control. This is essential for temperature-sensitive materials and can be insulated with mineral wool and cladding for energy efficiency and operator safety.
2. PTFE-based shaft seals provide chemical resistance and meet sanitary and food-grade requirements.
3. Mixing blades are made of cast stainless steel and are tangentially positioned to maximize mixing efficiency.
4. Material discharge options include manual hand-wheel operated tilting, hydraulic lifting, or automatic systems. Pneumatic or screw discharge systems can be integrated for specialized applications.
5. Additional options include spray injection systems, vacuum mixing capability, blade cooling, and explosion-proof configurations for hazardous environments.

1. Applications
   
   The Sigma Batch Mixer is ideal for processing adhesives, paints, doughs, slurries, resins, polymer gels, plasticizers, sealants, and other viscous or pasty materials.
2. Vacuum mixing versions are especially suitable for degassing volatile compounds or removing entrapped air during processing.
3. It is frequently used in pharmaceuticals, food, polymers, plastics, cosmetics, and specialty chemicals where precise kneading and uniform dispersion are critical.
4. Technical Specifications (Typical Lab Models
5. Working capacities range from 5 to 50 liters depending on model.
6. Gross volume ranges from 8 liters (ASM-5) to 80 liters (ASM-50).
7. Motor power typically spans 1 HP to 5 HP, scaled with model size.
8. Power supply options are customized to local standards.
9. Stainless steel 316 construction with mirror or matte finish.
10. Optional features include vacuum operation, jackets for heating/cooling, automated discharge, and integrated spray systems.

Key Benefits

1. High-shear mixing delivers consistent, homogeneous products even with viscous materials.
2. Jacketed options enable precise thermal control.
3. Stainless-steel construction ensures durability, hygiene, and compliance with GMP.
4. Scalable batch sizes support both R&D and pilot-scale production.
5. User-friendly design with overload protection and sealed drive systems enhances safety.

Applications Summary

1. Pharmaceuticals: ointments, creams, gels, pastes.
2. Food: dough, pastes, fillings, confections.
3. Polymers & Plastics: adhesives, resins, sealants.
4. Chemicals: slurries, pigments, specialty chemicals.
5. Cosmetics: lotions, balms, viscous creams.

Why Choose HiTechTrader for the Sigma Batch Mixer?

At HiTechTrader, we understand that reliability, precision, and cost-efficiency are critical when investing in specialized mixing equipment. Every Sigma Batch Mixer we provide is carefully inspected, refurbished, and tested to ensure performance that meets or exceeds OEM standards. By choosing HiTechTrader, you gain access to high-quality mixers at a fraction of the cost of new units, backed by our expertise in matching equipment to your specific application. Our inventory flexibility allows us to supply mixers with options such as vacuum operation, jacketed temperature control, or automated discharge to fit your process needs. With responsive customer support, trusted industry experience, and fast delivery, HiTechTrader ensures that your lab or pilot plant receives a proven, dependable mixer solution that maximizes value and efficiency.