Explosion-Proof Sigma Mixer
Sigma Mixer with Spraying System
Standard Design（Customizable）:
Material: SUS 304, 316 or mild steel
Discharging: Tilting discharging/Screw extruding discharging/Bottom plate
Heating: Electric heating/Water heating/Oil heating/Steam heating
Cooling: Water cooling/Jacket cooling
Vacuum: Water-ring vacuum pump/ buffer tank.
Motor: Explosion proof motor
Independent Control Panel: Variable speed/ Temperature/Discharging
Working Volume: 5 to10,000 Cubic Feet (from experiment to production)
Product Description
Overview
Karvil Machinery 1000-liter explosion-proof sigma kneader mixer, specifically engineered for high-risk material processing such as nitrocellulose used in explosives. This custom-built mixer is delivered to the client, ensuring maximum safety, precision, and performance in hazardous environments.
The equipment features a 700L effective mixing volume and is equipped with mirror-polished SS304 for all product-contact surfaces, ensuring contamination-free blending. The Sigma blades, powered by a 55kW flameproof motor (Beide brand), provide efficient kneading with dual-speed operation—adjustable from 0–37 rpm (high) and 0–26 rpm (low) via frequency inverter control.
To address temperature-sensitive mixing, a water-circulation cooling jacket is integrated into the tank. Material discharge is handled through a hydraulic tilting system, allowing for fast and complete unloading. The unit also incorporates a 2.2kW explosion-proof hydraulic station and a safety interlock system that halts operation when the cover is opened.
Why Use Sigma Mixers for Explosive Compounds?
Explosives, whether military-grade or used in civil blasting operations, often consist of a complex mix of powders, binders, plasticizers, and stabilizers. These materials are not only sticky and dense but also sensitive to friction, pressure, and temperature. The sigma mixer is uniquely suited for this task due to its:
Robust double sigma blades: Ideal for uniform kneading and dispersion of solid-liquid components.
Vacuum sealing and temperature control: Prevents contamination, reduces oxidation risk, and ensures thermal stability throughout the process.
Explosion-proof configurations: Equipped with flameproof motors, grounded connections, anti-static materials, and pressure relief systems to comply with ATEX directives.
＞The Karvil sigma mixer is consist of mixing chamber, frame support, hydraulic system, electric control system, discharge system and two Z shape blade in the chamber drove by the motor.
＞In the field of sigma mixers, Karvil Machinery satisfy completely their customers’ needs. Through the action of the sigma blade, the hard and tough paste is mixed for a perfectly homogeneous mixture.
＞Please contact us and we will assist you in developing the right solution for you. There is also a laboratory size z blade mixer available. Click here.
Technical Parameters
| Type | NH-5 | NH-10 | NH-100 | NH-300 | NH-500 | NH-1000 | NH-1500 | NH-2000 | NH-3000 | NH-4000 | NH-5000 | |
| Total Volume (L) | 5 | 10 | 100 | 300 | 500 | 1000 | 1500 | 2000 | 3000 | 4000 | 5000 | |
| Mixed amount/batch (L) | 1.5-3.5 | 3.0-7 | 30-70 | 90-210 | 150-350 | 300-700 | 450-1050 | 600-1400 | 900-2100 | 1200-2800 | 1500-3500 | |
| Rotation Speed (rpm) | 42/34 | 42/34 | 37/21 | 37/22 | 37/23 | 37/26 | 37/22 | 30/21 | 30/21 | 30/20 | 28/18 | |
| Main Motor Power (Kw) | 0.75-1.5 | 1.1-3 | 5.5-11 | 7.5-30 | 15-37 | 22-90 | 22-90 | 30-110 | 30-110 | 45-110 | 55-132 | |
| Heating Methods | Steam Pressure (MPa) | Jacket for steam ≤0.3MPa | ||||||||||
| Electric Power (Kw) | 2.4 | 2.4 | 6 | 12 | 18 | 30 | 45 | 54 | 72 | 72 | 90 | |
| Vacuum (MPa) | 0~ -0.096Mpa (Vacuum Kneader) | |||||||||||
| Discharging Method | Tilting cylinder | |||||||||||
| Screw extrusion | ||||||||||||
Our Services
LABORATORY TEST In order to be able to demonstrate the advantages and modes of action of our industrial mixing machine with your products, our fully equipped modern laboratory/technical center is at your disposal. |
PROFESSIONAL ENGINEER The experienced team of engineers is specialized in the R&D and design of mixers, grinding equipment, and plastic recycling machine. Karvil explores new technical points constantly to create perfect solutions for customers. |
DIRECT FACTORY Karvil factory has a series of strict standard system to control the procurement of raw materials, manufacturing process, in-process inspection, and product inspection, so as to ensure the quality of our products. |
Applications
F.A.Q.
Q1: What types of materials is this explosion-proof sigma mixer suitable for?
A: This mixer is specially designed for high-risk materials like nitrocellulose, explosive pastes, propellants, and other hazardous chemicals that require a flameproof environment and controlled mixing conditions.
Q2: How does the explosion-proof design enhance safety?
A: The mixer features a flameproof motor, an explosion-proof hydraulic system, and a safety interlock switch that immediately stops operation if the cover is opened. All components in contact with hazardous materials are made from mirror-polished stainless steel (SS304) to prevent contamination and sparks.
Q3: What is the benefit of hydraulic tilting discharge?
A: Hydraulic tilting allows for complete and efficient discharge of high-viscosity materials without manual handling, reducing operator risk and increasing productivity.
Q4: How is temperature controlled during mixing?
A: The mixing chamber is equipped with a cooling water jacket, ensuring the material temperature remains stable during processing—critical for heat-sensitive explosives like nitrocellulose.
Q5: Can the mixing speed be adjusted?
A: Yes, the sigma blades operate at two variable speeds (0–37 rpm fast / 0–26 rpm slow) controlled by a frequency inverter, providing flexibility for different processing stages.
Q6: What certifications does Karvil Machinery offer for explosion-proof mixers?
A: Karvil can supply ATEX or CNEX-compliant equipment depending on customer and regional safety standards. Certification is available upon request.