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 VILAS'
Sigma Mixer is used for mixing highly viscous materials in
various industries viz. Adhesives, Chemical, Confectionery,
Carbon Black, Ceramic, Dyes & Pigments, Food Products,
Grease, Lead Storage Battery, Paint, Putties, Plastic,
Pharmaceuticals, Printing ink, Resin, Rubber, Soap &
Detergent etc.
Sigma Mixer consists of two counter-rotating blades in two
semi-cylinders, the intersection of which forms a saddle
piece and meeting tangentially just above the saddle the
blades are driven by gearing at both ends. The mixing action
is a combination of bulk movement, smearing, stretching,
folding against the blades and sidewalls. The blades, which
are ground and polished, successively sweep all portion of
the trough surface during each revolution.
Type of Blades -
1. Sigma Blade - Sigma blade is capable of starting and
operating with either liquids or solids or a combination of
both. Sigma Blades give shredding or wiping effect. It has
good mixing action, readily discharges materials which do
not stick to the blades and is relatively easy to clean when
sticky materials are being processed.
2. Double Naben - In specific applications a lump bridge
across the two sigma blades is formed. To avoid the
formation Naben blades are used.
Special Features of Sigma Mixer -
DISCHARGE -
1. Tilting tank. For small
machines Tilting is mechanical type (hand-lever or
hand-wheel). For bigger machines Tilting is
electromechanical or hydraulic.
2. Extrusion screw. The extrusion-discharge screw is
situated at the centre of the bottom part of the saddle
under two sigma blades. During the mixing the screw pushes
the material towards the sigma blades ensuring uniform
mixing. At discharge time, the direction of rotation of the
screw is reversed and the mixed material is extruded out of
the machine. Separate drive is provided for this Screw.
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CORED BLADE - Hollow
blades to enable internal cooling or heating
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Overlapping Blades
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Vacuum Design, Cover
Design is optional
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Provision for HEATING or
COOLING (Jacket) as per process requirements
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Capacity - 25 Ltr. to
2500 Ltr.
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Constructed of SS 316, SS
304 and carbon steel
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