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 effectivenessGood environmental compatibility
Lasting effect, e. g. for light stabilizersLow 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


Metering and dosing additives in the plastics industry
Plastics industry

Pumps and Systems for the Plastics Industry

We offer you special expertise for all compounding processes in the plastics processing industry (addition of waxes, flame retardants, and lubricants). Contact our experts! We're happy to give you advice about metering and pumping solutions for the plastics industry such as in polyethylene processing.

More Details


LEWA ecoflow diaphragm metering pump all around talent

LEWA ecoflow®: The Leading Diaphragm Metering Pump for Precision Fluid Management

LEWA ecoflow: The Innovative Universal Metering Pump with DPS Diaphragm Protection. Trusted across all industries, this modular system pump excels in a wide range of applications. Experience unparalleled versatility and reliability with our ecoflow, the ultimate choice in metering pump technology.

More Details
LEWA ecosmart diaphragm metering pump

LEWA ecosmart®: Precision-Engineered Diaphragm Metering Pumps for Efficient Fluid Control

Experience the innovative LEWA ecosmart, a compact diaphragm metering pump offering multiplex capabilities at a competitive price. We assure the renowned LEWA quality, backed by our 70 years of market expertise. Choose LEWA ecosmart for smart metering pump solutions without compromising on quality or performance.

More Details
LEWA ecofoam metering system

LEWA ecofoam® Blowing Agent Metering System

Redundantly designed, absolutely leak-proof system working in combination with extruders for metering various blowing agents in plastic production.

More Details
LEWA production units

Customer-Specific Metering, Mixing or Filling Systems from LEWA

Customer-specific batch/continuous systems for your production process. Metering, mixing, filling, separating, controlling temperature: We work with you to develop the ideal process-related sequence and produce the system that fits your production process – right up to the end product.

More Details
LEWA customer specific metering systems

Customer-Specific Metering Systems from LEWA

Turnkey metering system in closed loop control with monitoring and plausibility testing equipment. Your individually configured metering system with an optimally designed pump for fluid metering in automated processes.

More Details

Keep in touch with us

Get insights into our products and applications for liquid metering. You will also receive all the latest news about LEWA as well as invitations to our exclusive events.

Social Media

LEWA is on LinkedinLEWA is on YouTubeLEWA is on Instagram
©2024 LEWA GmbH  Terms & Conditions Privacy Imprint