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Extruder Screw Sigma Mixer
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The extrusion
screw is located in the saddle section and
runs in a cylindrical trough tangential
to and below the 2 mixing blades.
The extruder mixer
is designed to handle difficult to discharge
products such as hot melts and butyl sealants,
as well as other medium to high viscosity
pastes. This type of mixer combines the
action of the Double Arm Sigma Blade
Mixer with an extrusion screw placed
in the lower part of the mix trough. During
mixing, the extrusion screw is run in reverse
which imparts a third mixing action on the
product, increasing mixing efficiency.
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When the product has finished
the mixing cycle, discharge/extrusion is performed
simply by running the extrusion screw in a
forward direction.
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The double arm sigma blades
normally continue to run throughout the extrusion
process providing a thoroughly mixed product
at all stages of the production cycle.
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By changing the extrusion die
heads, the product can be discharged in round,
square, "spaghetti", or any form
desired.
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Speed variation of the extrusion
screw allows adjustment of the product flow,
depending on the viscosity.
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As an option, a die cutter
can be installed outside the die head. This
bevel-faced cutter provides transverse cutting
and can be pneumatically driven.
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Features:
- Automatic control of blade speed based
on product viscosity
- Capability to pass from mix phase to
extrusion phase without interruption
- Lateral discharge of product through
the extrusion screw without operator interaction
- Shape of extruded material is adaptable
to customer's requirements
- Provides cycle automation; loading,
mixing, and extrusion
- Temperature control available for handling
heat treated products
- Enclosed mixing and discharge provides
protection from product contamination
and greater operator safety
- Vacuum and/or pressure designs
- Safety grating mounted between cover
and trough
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| Kneader with screw |
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