NFM
Latex Coagulation Elastomers
With over 20 years
of experience in direct latex extrusion (emulsion
conversion) processes, NFM/Welding Engineers is uniquely
qualified and fully equipped to help you achieve
superior product results, optimize operations, and
reduce expenses. Our counter-rotating, non-intermeshing
twin screw extruders have been
proven to be ideal process machines for latex coagulation
applications.
The Simplicity of
a Single Machine
- Reduced
Plant Space:
A NFM/WE extruder
replaces a full array of equipment-typically,
three large tanks for coagulation and
washing, a mechanical dewatering stage,
and an evaporative drying stage, and
may eliminate the need for a thermal
dryer.
- Reduced
Material Handling:
Extruder
screws transfer material from one process
stage to another, thus eliminating
slurry pumps and preventing fouling
from non-wiped surfaces.
- Reduced
Down Time:
The
complete line can be started up or
shut down in one half hour. Product
can be changed in one half hour compared
to conventional systems that can require
several hours.
Environmental & Safety
Advantages
- Reduced
Emissions:
All waste streams
are fully contained. A short fluid bed
conveyor can replace large apron dryers.
- Reduced
Solids Losses:
A
small amount of solid latex particles
are removed in the effluent water.
These particles can easily be screened
out and recycled back to the extruder
resulting in reduced solids loss.
- Reduced
Wastewater Volume:
The amount
of water required to wash the polymer
is significantly reduced due to the small
wash stage volume of the extruder and
high water flow rate. Reduced waste water
volume lowers waste treatment requirements
and fewer potential emissions.
- Safer,
Cleaner Handling:
An optional
Turbulator cutter can be incorporated
to cut rubber crumb and airvey the crumb
to an optional apron dryer. The airveying
technique allows easy transport of the
crumb between the extruder and the apron
dryer.
The airveying technique is also resistant
to the accumulation of fines, resulting
from all surfaces of the tube being exposed
to the high velocity air. This effect
makes it possible to airvey material
directly from the Turbulator for distances
of as much as 75 meters to an apron dryer
without contamination problems.
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SUCCESSFULLY
ISOLATED POLYMERS
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Elastomers
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Butyl Acrylate
Polychloroprene
SBR
NBR
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ASA
MBS
Fluro-Elastomers
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Superior
Product Quality & Consistency
- Minimizes
Thermal History:
The NFM/WE process
converts polymers from emulsion to crumb
in less than two minutes. Wash water temperature
and flow rates are used to control temperature,
this technique has proven to be extremely
reliable.
- Reduced
Drying Stage:
Hot air drying
stages that can degrade the product are
eliminated. Sticky, low molecular weight
materials that cause contamination and
dryer fires are easily dried in this process.
- Eliminates
Material Build Up:
Coagulation tanks,
wash tanks, transfer piping, and most hot
air dryers tend to accumulate material
which leads to product yield loss. The
surface area of the extruder is frequently
wiped by the screws, which allows rapid
purge times and reduced chance of contamination.
Process Parameters
- Viscosity
Range:
20-80 Mooney
Viscosity.
- Emulsion
Solids Content:
10% and higher.
- Temperature
Control:
Temperature of
the material is controlled by steam and
water injection rate to achieve desired
devolatilization without degrading the
polymer. Material temperature can be controlled
between 130° and 200°C. depending
on screw speed, throughput rate, wash rates,
and temperatures.
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NFM/WE
Machine Capabilities
Specifications are subject
to change without notice. |
Contact
Us
- For more information on latex
coagulation or any other processes made possible
by an NFM/Welding Engineers' system, please
contact us. We would be glad to provide additional
data or technical support at any stage of your
project.
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