Pumps and Systems for the Plastics Industry

LEWA supports plant construction companies, manufacturers, and processors in the plastics industry with pumps and systems for many different processes.

We deliver high-quality pumps and custom-built systems for these applications all over the world. You get this complete service from a single source, from consultation through to commissioning.


With LEWA Products Throughout the Production Process

LEWA supplies pumps and systems to support you in the many different production steps involved in plastics processing. We assist you in the processing of polyethylene, polypropylene, polyurethane, and polyamide. What's more, we also supply you with metering systems for compounding as well as for catalyst and foaming agent metering.

We offer you special expertise for all compounding processes in the plastics processing industry such as the addition of waxes, flame retardants, and lubricants.

LEWA ecofoam metering system for the plastics industry

Areas of Application in the Plastics Processing Industry

Our experts are on hand with help and advice and will work with you to develop custom metering solutions. Our expertise in polyethylene processing in particular is in high demand worldwide. In the following table, you can see applications for the metering of reactants and catalysts.

Examples of reactants and catalysts Examples of plastics
  • Vinyl acetate
  • Propylene
  • Butane
  • Hexane
  • Teal, T.E.A.
  • Varieties of polyethylene
    1. LDPE
    2. MDPE
    3. HDPE
    4. LLDPE
  • Donor
  • Peroxide
  • Polypropylene
  • Catalysts
  • Polyvinylchloride (PVC)
  • EPVC
  • SPVC
  • Amine
  • Vinyl acetate
  • Ethylene vinyl acetate (EVA)
  • Dinitrotoluene (DNT)
  • Raney nickel catalyst
  • Polyurethane
  • Catalysts
  • Polyacrylate
  • Caprolactam
  • Polyamide
  • Urea, liquid ammonia
  • Melamine


LEWA supports you in the further processing and refining of plastics. This includes compounding, i.e., during the addition and metering of flame retardants and lubricants, plasticizers, colors, antistatic agents, and other additives for property optimization, as well as foaming agent metering during foam extrusion.

Base plastic Examples of products
  • LDPE (examples)
  • Shrink wrap for books, bundles, and pallets
  • Wrapping film for hand towels, fabrics, PET bottles
  • Film for baked goods, meat, coffee, frozen foods
  • Packaging for applications such as milk cartons and "bag-in-box"
  • Laminated paper and highly stress-resistant containers for industrial use
  • Polystyrene foam (PS foam)
  • Insulation boards and food packaging trays
  • Polyethylene foam (PE foam)
  • Packaging films, impact sound insulation, ceiling sealants, and insulation tubes
  • Polyurethane foam (PU foam)
  • Insulation boards, insulation tubes
  • Foam granules (EPS/EPP/EPE)
  • Reusable transport packaging and molded parts for bumper cores
  • Polycarbonate
  • Safety helmets, visors
  • Lamp covers for the automotive industry
  • Other raw material bases
  • Plastic sheathing for cables
  • Rubber production

Solutions for Plastics Processing

Our LEWA ecofoam system provides a tested and modular metering system for your specific application in the field of physically foaming polyolefins such as polyethylene processing.

This system is used worldwide by leading manufacturers and is characterized by controlled and exact metering. Not only does this ensure that the foamed product is always of a consistently high quality, it also significantly reduces scrap.

LEWA ecofoam metering system for the plastics industry

Advantages at a Glance

High end pumps, equipment and systems

We deliver high-end pumps integrated into complete systems and units for your specific applications. In doing so, we of course rely on the tried-and-tested LEWA quality.

Flexible application

High variability in operation in terms of pressure, temperature, flow rate and fluid properties with high metering accuracy guarantee a wide range of applications.

Tried and tested modular system

We design our systems and units in modular design with numerous engine and pump head combinations for different applications.

Special materials

On request, we can build systems with special materials such as Hastelloy, titanium, duplex stainless steel or further materials. If you are interested, please contact our product manager.

Heating and cooling devices

We respond flexibly to extreme requirements: Pump heads and the complete chemical pump can be equipped with a heating or cooling device, if necessary.

Patented sandwich diaphragm

Our patented diaphragm metering pumps use metal or PTFE sandwich diaphragms with Diaphragm Protection System (DPS) for maximum operational safety.

Easy to clean

An especially important advantage for pharmaceutical and food industry is that our systems can be quickly and easily cleaned with cleaning chemicals or hot steam.

Explosion protection

Safety comes first: LEWA supplies systems and units, also available with explosion-proof motors for safety of your employees.

International standards

LEWA pumps, systems and units are compliant with major international standards such as DVGW G280, WHG, PED, ISO 9001, ASME, ATEX and TA-Luft. Of course, you can also define your own standards.


Additive metering for plastics

LEWA provides system solutions for metering additives for plastics. Ask our additive metering experts for more information!

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LEWA manufactures metering pumps and metering systems for polymerization which optimally meet the necessary requirements. We are happy to help.

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Extruder blowing agents

Precise metering of blowing agents into extruders with LEWA systems. We provide you insights on the metering accuracy and process optimization solutions from LEWA. 

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Production of melamines

LEWA metering and process diaphragm pumps meet the specific demands for the production of melamine (trimerization of urea). Consult us!

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Chemical metering in high-pressure cleaning systems

LEWA metering and process diaphragm pumps meet the specific demands for the production of melamine (trimerization of urea). Consult us!

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Production of polyurethane

LEWA is your reliable production process partner for conveying preliminary and intermediate products during the production of polyurethane.

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Metering of caprolactam

Completely heatable process diaphragm pumps, optimized for continuous operation, are required for the production of caprolactam as a base for polyamide 6.

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Metering of silane

LEWA systems meter any silane type reliably, precisely as well as in constant consistency and purity, regardless of chemical or physical attributes or process requirements.

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LEWA ecoflow® diaphragm metering pump

LEWA ecoflow is the innovative and universal metering pump with DPS diaphragm protection system in a tried-and-tested modular system. Suitable for numerous applications, the ecoflow is our real all-around talent, relied on by customers from all industries.

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LEWA ecoflow ® packed plunger metering pump

The LEWA ecoflow packed plunger metering pump is the robust, tried-and-tested metering pump for unproblematic fluids. It is available in a wide variety of models and used by well-known customers for various processes.

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LEWA ecosmart® diaphragm metering pump

LEWA ecosmart is an innovative, compact and multiplexing diaphragm metering pump at a smart price. With it, we of course guarantee our renowned LEWA quality and offer you our expertise derived from 60 years in the market.

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LEWA ecodos® mechanical diaphragm metering pump

LEWA ecodos is an absolutely reliable, economical and highly adaptable metering pump, especially where diaphragm actuation is not wanted. Here, we also rely on our tried-and-tested modular system in designing the perfect pump for you.

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LEWA intellidrive® diaphragm metering pump

Design the suction and discharge strokes of the metering pump to meet your specific requirements! With LEWA intellidrive technology, you can model pumping characteristics individually.

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LEWA FC laboratory pumps

Metering pumps for very small flow rates. The FC micro-metering pumps for pressures up to 400 bar were developed specifically for laboratories and test centers.

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Nikkiso cryogenic pump

In the oil and gas industry, Nikkiso centrifugal submerged wetted motor pumps are used for transporting cryogenic liquefied gases (LNG and LPG). They feature numerous model versions and long life spans.

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Nikkiso Non-Seal® canned motor pump

The Nikkiso Non-Seal canned motor pump has been designed specifically for the chemical industry. To do this, the centrifugal pump is designed in accordance with API 685.

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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.

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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.

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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.

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