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  Mixers >> Sigma Mixer Extruder
SPECIFICATIONS: ( English French German Italian Portuguese Spanish )
Sigma Mixer ExtruderThe Kneader Extruder combines the efficiency of a double arm mixer with the convenience of extrusion screws for improved mixing and discharge of heavy viscous materials.

The Kneader Extruder includes a set of contra-rotating kneading blades and one or more extrusion screws. The blades are mounted on a horizontal axis in a W-shaped trough. Below the blades in a separate cavity are the extrusion screws. During the mixing cycle the blades rotate towards each other while the mixing screws rotate in a reverse direction, constantly feeding new materials into the mixing blades. After the mixing/kneading cycle is complete, the screws are reversed and they extrude and transport the mixed materials out of the mix zone.

Type of Blades
Sigma blades are best suited for all round use. These may be positioned with either tangential or overlapping action. Both actions provide excellent mixing characteristics.
Spiral blades provide excellent mixing for fiber-reinforced products. These do not have the same heavy - duty shearing action like other blades and therefore produce a smooth homogenous mix with no fiber breakdown.
Masticator blades provide excellent mixing and kneading action for highly viscous, tough masses. These are widely used by the rubber industry in Dispersion Kneaders and Intermixes.
Naben blades produce extra shearing action required for certain materials. The blade geometry resists distortion from stresses in the mixing load. These are available in both tangential and overlapping action mixers.

Standard Features

  • Available in all grades of Carbon Steel and Stainless Steel.
  • Available with single and twin screw designs.
  • Optional Teflon Coated Internals for Food and Sticky material applications.
  • Optional wear resistant liner plates provided for abrasive products.
  • Jacketed construction available for heating and cooling applications.
  • Can be offered for vacuum application.
  • Available in working capacities of 5 Liters to 2500 Liters. Other sizes manufactured on request.

Customised Features

  • Good Manufacturing Practice (GMP) models.
  • Explosion-proof motors, Variable Speed Drives along with Electrical Control Panel.
  • CE


  • Ideal for mixing, kneading of highly viscous mass, sticky and dough like products.
  • Mixing of pastes, rubber, and heavy plastic masses.
  • Applications in Food, Rubber, Pharmaceutical and Chemical industries.
  • Dry powder to wet phase mixing.

Advantages over conventional tilting bottom discharge kneaders:

  • Low mixing time.
  • Continuous operation possible because of extrusion screw.
  • Elimination of the manual scraping of sticky/tacky materials.
  • Eliminates operator exposure to materials at elevated temperatures or those of a toxic nature, thereby improving plant safety.
Sample Applications Of Sigma Mixer Extruder
Biscuit doughs
Butyl rubber
Carbon pastes
Chewing gum
Crayon and pencil lead
Fiberglass resin doughs
Food and confectionery products
Gaskets and Gland Packings
Grinding wheel preparations
Inks and pigment products
Metal powders
Moulding preparations
Pencil erasers
Sealing compounds
Silicone rubber
Soaps and detergents
Solid propellants
Sugar pastes
Viscous rubber solutions