Sigma Blade Mixer with Screw Discharge

KARVIL kneader

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)

Custom-Engineered Sigma Kneader Mixer for High-Viscosity Applications

Karvil Machinery introduces a 400L vacuum sigma kneader mixer, designed for challenging formulations involving rubber and organic solvents. Tailored for the client, this mixer integrates precise temperature control, vacuum processing, and efficient screw extrusion discharge, ensuring optimal mixing quality and processing efficiency.
Whether you're producing rubber-based adhesives, sealants, or specialty polymers, this machine delivers consistent results in a controlled environment, with every component built for reliability and chemical resistance.

Why Upgrade to Screw Discharge?

While the traditional hydraulic tilting discharge works for general mixing, the Screw Discharge (Extruder) system offers a significant advantage for high-viscosity materials and automated production lines. Here is why 70% of our US and EU clients prefer this configuration for heavy-duty processing.

1. Seamless Downstream Connection (Automation)

Unlike tilting mixers that dump material into a bin, the screw discharge allows for continuous extrusion. You can connect the mixer outlet directly to a granulator, packing machine, or cut-to-length system.

Benefit: Eliminates manual material transfer and reduces batch-to-batch downtime.
Perfect for: BMC/DMC, Chewing Gum, and Masterbatch production.

2. Solves the "Sticky Material" Headache

For ultra-sticky materials like hot melt adhesives or butyl rubber, dumping the bowl is ineffective because the material sticks to the walls.

The Solution: The bottom screw acts like a powerful extruder, mechanically forcing the material out through the die head.
Result: Minimal residue left in the tank and zero need for manual scraping, saving hours of labor costs on cleaning.

3. Superior Forming & Shaping

You can mount different die heads (nozzles) onto the discharge outlet.

Versatility: The material can be extruded directly into specific shapes—tubes, strips, sheets, or round logs—ready for the next processing step.
Efficiency: Combines "Mixing" and "Pre-forming" into a single machine.

4. Enhanced Safety Standards

Tilting a heavy, hot mixer bowl filled with 1000L of chemicals poses safety risks.

Safety First: The screw discharge allows the machine to discharge material while the mixing chamber remains fully closed and stationary.
Compliance: Reduces exposure to hot vapors and moving parts, meeting stricter US/EU workplace safety regulations.

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
Heating Methods	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
Discharging Method		Screw extrusion

Applications

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.

F.A.Q.

Q1: What materials is this sigma mixer suitable for?

A: It is ideal for high-viscosity and solvent-based mixtures such as rubber compounds, adhesives, elastomers, sealants, and chemical pastes.

Q2: What is the advantage of screw discharge in a sigma kneader?

A: Screw extrusion allows for faster, cleaner discharge with minimal residue, especially for sticky or viscous materials.

Q3: Can the temperature and speed be adjusted during mixing?

A: Yes, both mixing and screw speeds are frequency controlled. The temperature can be regulated via the steam jacket system.

Q4: How is cleaning and maintenance handled?

A: The hydraulic lifting cover, large manhole, and mirror-polished interior make cleaning and maintenance convenient and efficient.

Q5: Is this machine customizable?

A: Absolutely. We offer customization based on your material properties, processing volume, discharge requirements, and more.