Metering additives with LEWA systems

Specific product properties are optimized during the compounding of plastics by injecting additives.

In order to avoid the disintegration of the additive by local overheating or coagulation in cold spots, LEWA offers heated systems for the metering of additives with custom combinable components.

  • Discharge pressure max. 60 bar
  • Temperature: max. 130° C
  • Flow rate: min. 0.1 kg/h - 600 kg/h

Solutions for additive metering

LEWA supplies complete, ready to use solutions fitting your application. All combinations of the LEWA modules offer a completely automatic, clean, reliable and flexible extrusion.

The scope of services ranges from the supply of system assemblies through engineering and the start up of complex metering and mixing systems with custom system control, process display, logging of operational data, as well as interfaces to the process control system. The scope, including the process control, is done from one source and guarantees the optimal safety and functionality of the system.

Advantages of LEWA heated systems:

  • Suitable for all additives
  • Costs for compounding and master batches are 
    reduced or even eliminated
  • Available in all control configurations
  • Guaranteed reliable and flexible process by 
    the control/regulation of the mass flow
  • No deterioration of the additive by local overheating
  • No coagulation due to cold spots

Operator and service friendly complete system:

  • Clever arrangement and good accessibility of the piping
  • Hinged locking doors that open wide
  • Easy removal of side parts (service)
  • Fine filters operated alternately, which can also be switched over externally during operation

LEWA heating module

Production of plastics -control module

Insulated stainless steel cabinet with regulated air circulation and reliable sensor system; all equipment required for operation is accessible from the outside; electric heating, using steam or thermal fluids.

LEWA metering module

Production of plastics -control module

Single or multiple metering pump with filter, safety valve, pulsation damper, flowmeter and pressure regulation.

Production of plastics -control module

LEWA melting module

Stainless steel containers in various sizes with heating jacket, sensors and also optionally available with mixer; electric heating, using steam or thermal fluids.

Production of plastics -control module

LEWA control systems

Slave PLC, stand-alone PLC, microcontroller, relay technology, optional explosion proof.

Production of plastics -control module

LEWA cooling module

Plate or tube-bundle heat exchanger optional cooling unit for all coolants.

Areas of application in additive metering

LEWA metering systems process the following additives, for example:
Flame retardant
Sliding agents
Anti-fog agents
Anti-static agents
Wetting agents
Anti-oxidation agents

Background information for additive metering

Extrusion is an important process in the plastics industry. Extruders must be heated, in order to melt the filled plastic granules or powder.

Some process related tasks make it necessary to cool the plasticized melt. Depending on the plastic used, other equipment is necessary, e.g., for pumping gases, which leave bubbles in the end product.

Normally other machines are required after the nozzle in the production of plastic products.

They are subject to the following requirements: In addition, there are the requirements for all raw materials:
Specific effectiveness Good environmental compatibility
Lasting effect, e. g. for light stabilizers Low health risks
  High efficiency
  High stability
  No negative influences

In general, the quantity used is very low and includes less than 1% of the total recipe.

Source: Wikipedia, February 2012


Plastics processing

LEWA supports you in plastics processing with custom-built plants and systems. Ask our experts for more information!


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