Mixing Stations

Mixing Stations
Volumetric and gravimetric Mixing Stations
Range of application and functions
PLASTICOLOR proportioning units and
mixing stations are designed for dosing
granular, free flowing and non-sticky
materials. The
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ranges of application are
all common manufacturing processes of
the plastics industry, such as extrusion,
injection moulding etc.
Standard mixing stations consist of 2 to
8 PLASTICOLOR units, mounted on a
common neckpiece.
Special mixing stations for more than
8 components can be designed and
supplied.
In a PLASTICOLOR mixing station every
individual component including the main
material is dosed by a PLASTICOLOR
unit into the neckpiece and thus into the
production machine.
The special neckpiece shape and the
integrated mixing insert ensure an
optimum material distribution of all
individual components in the right mixing
ratio, immediately on the extruder. The
flow channel is designed to avoid any
kind of separation.
The modular design of the systems
facilitates the easy and inexpensive
extension of existing mixing stations
or conversion from volumetric into
gravimetric operati���
on.
Setting and controlling the dosed output
The mixing station is adjusted in a way to yield a total output that
exceeds the maximum consumption of the production machine. This
results into a continuous filling process in the neckpiece, irrespective
of the material consumption of the production machine.
Two sensors, mounted in the neckpiece, switch all units on and off at
the same time, according to the actual material level obtained. Any
fluctuations in the consumption of the production machine only affect
the switching frequency, not the percentages of the total compound
mix.
The hoppers can optionally be equipped with a low level alarm to
generate an alarm signal if one of the units is running empty.
· High dosing precision by state of the art electronics and
mechanics (approx. + 0.5% or better)
· Extremely few premixed material residuals during sudden
production changes
· Material changes and tests without stopping production
· No separation
· Extreme mixing rations possible, e. g. 1 : 2,000
· A very good reproducibility
· Recipe storage
· Extensive monitoring functions, e. g. level alarm, monitoring
of throughputs, an informative alarm system
· High reliability, even under the toughest conditions
· Field-tested and practicable options for many applications
· Complete listing of all operational data and faults
· Exact recording of all consumption data and production
processes
· All standard mixing stations and spares immediately
available from stock
PLASTICOLOR Mixing Station design
PLASTICOLOR-Mixing Station neckpiece
The optimized design of the neckpieces suits the production process
in a perfect way. The perfect material flow channel is designed to
avoid any kind of material separation.
Different upper sections for 2- to 8-component systems are standard
available. These can each be used in combination with neckpiece
tubes in different sizes, depending on the output of the station.
Different mixing inserts are available for many different applications.
• The neckpiece adapter is designed to fit the feed opening of the
according production machine.
• The neckpiece tubes and the upper neckpiece sections can be
turned in 15 steps, to be able to position the individual PLASTICOLOR units and the sight glass in any desired way.
• Cleaning and maintenance can be done in a quick and effective
way by easy-to-open sight glass ports.
• The modular design permits an exchange of neckpiece tubes, upper sections, mixing inserts and adapters at any time in the case
of changes of production requirements.
The PLASTICOLOR Dosing Units are
mounted to the common mixing station
neckpiece.
For this, a wide range of different PLASTICOLOR units, that can be used both as individual dosing units as well as forming a part
of mixing stations, is available. Each individual unit may dose 0.15 - 2,400 kg/h, thus
obtaining a high throughput versatility.
For further details, please refer to our
brochure „Dosing Units“.
Screws and hoppers
Rapid discharge devices
Vacuum pumps
Ionization system
Magnetic separators
Shut-off slides
PLASTICOLOR Mixing Station with PLASTICOLOR
material separators for a central, separately mounted
pump and accessories for a wide range of applications
Gravimetric Mixing Stations
Volumetric Mixing Station with
PLASTICOLOR hopper loaders (for
more details, please refer to our
separate brochure “Hopper loaders”)
Gravimetric Mixing Station with hose
connection for the direct connecting to
larger containers
The basic design of a gravimetric Mixing
Station is identical to the one of a volumetric
Mixing Station (left picture).In addition, each
PLASTICOLOR unit is provided with a weigh
hopper assembly (right picture). Different
standard weigh hoppers for outputs between
300 and 2,800 l/h are available.
Either
- PLASTICOLOR hopper loaders
- PLASTICOLOR material cyclones
- PLASTICOLOR feed hoppers or
- hose connections
can be used above the weigh hopper
assemblies.
Function of gravimetric Mixing Stations
PLASTICOLOR Gravimetric Mixing Stations work according to the
“loss-in-weight” principle. The weight of each individual material component is recorded by an integrated electronic load cell. Each component is permanently and simultaneously controlled according to
the required portion in % of the total mix. This system is far superior
to and much more accurate than systems in which the single components are dosed one after another and only the total quantity is
weighed (= gain-in-weight systems).
Gravimetric Mixing Station with feed hoppers
• Extremely high metering accuracy
• Permanent automatic weight recording and
readjustment of every individual component
• No dependence on the bulk density of the
material anymore
• Fully automated processing
• High speed stability
• Easy operation of the control system
• No output tests required
• Considerable saving of additive materials
Mounting possibilities of PLASTICOLOR Mixing Stations
PLASTICOLOR Mixing Stations have the highest possible versatility, e. g…
... mounted directly on the machine feed opening
Generally, a mixing station is mounted directly on the feed
opening of the production machine. Adapters to fit the neckpiece
are manufactured by us.
... as a central mixing station
If several production machines are
supplied by the PLASTICOLOR Mixing
Station with the same compound, a larger
material container is mounted under the
neckpiece.
... next to the production machine
If only one production machine is supplied with the mixture, no
material container will be required.
Mixing Station control – PPM system
• Easy handling with only few entries required
• Complete listing of all operational data
and faults
• exact recording of the consumption
data and production processes
• No output test required for volumetric
Mixing Stations when using standard
materials
• Integrated extruder and take-off control, also for coextrusion lines
• Operation also possible by means of
visualization software, either on the
PC or via a choice of different field bus
systems (ProfiBus DP etc.).
Kunststoffmaschinen GmbH & Co. Vertriebs-KG
Bahnhofstraße 110
• D-82166 Gräfelfing fon: +49 89 85 48 00
• fax: +49 89 85 41 33 6
woywod@plasticolor.de • www.plasticolor.de
Subject to alterations, even without advance notice.
Measurements and data without obligation.
The PPM system allows an extremely precise control of all volumetric and gravimetric PLASTICOLOR Mixing Stations.
Data referring to raw materials, jobs and
mixing recipes can be stored and called
up at any desired time.
For further detailed information, please
refer to our separate brochure “PPM modular control system”.