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Gear pumps2019-06-28T08:30:37+02:00

Gear pumps for the extrusion of polymers and thermoplastics

Gear pumps transport a wide variety of media in industrial production processes in general, in the chemical industry as well as in the pharmaceutical and food industries. The matching gear pumps and pump systems can be found in MAAG’s wide range of products by plant manufacturers and producers and processors of plastics.

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Gear pumps for perfect plastics
The ideal gear pump for extrusion of polymers
Gear pumps and extrusion pumps from MAAG

MAAG gear pumps

cinox® therminox®

cinox® therminox® chemical transfer gear pumps are corrosion-resistant and heatable stainless steel conveying units that satisfy the stringent quality requirements of today's chemical processing industry. The wide assortment of components and materials of construction to choose from ensures that MAAG [...]

Application: Compounding • Extrusion • Industry • Masterbatch • Polymer production • Wire and cable jacketing
Category: Gear Pumps

cinox®-V therminox®-V

The polymer extraction pump models cinox®-V and therminox®-V are discharge pumps. They have been designed for highly viscous fluids, which are gently extracted from reactors and degassing devices even when the inlet pressure is low, ensuring optimum fill characteristics and [...]

Application: Compounding • Industry • Polymer production • Wood flour
Category: Gear Pumps

expac®

No matter how your process is designed, MAAG offers the best solution for any customer-specific application. The extrusion gear pump system and hot melt system use only high-quality proven components for compounding, masterbatch, and recycling. Know-how and combining are the [...]

Application: Compounding • Extrusion • Masterbatch • Recycling • Wood flour
Category: Thermoplast Extrusion Pumps

extrex® EX

Extrusion plants need extremely reliable units with high pumping consistency and a configuration to suit each application in the polymer extrusion industry. The modular design of extrex® extrusion gear pumps makes light work of meeting diverse requirements.Three types of this [...]

Application: Compounding • Extrusion • Masterbatch • Recycling • Wood flour
Category: Thermoplast Extrusion Pumps

extrex® GPD

The extrusion gear pump extrex® GPD (General Purpose Double piston screen changer) combines optimally economic and operating efficiency for extrusion lines.An extrusion line fitted with MAAG’s newest extrusion gear pump will be capable of running two completely different die head [...]

Application: Compounding • Extrusion • Masterbatch • Recycling • Wood flour
Category: Thermoplast Extrusion Pumps

extrex® RV/RB

When it comes to manufacturing profiles and dealing with strainers, high requirements are placed on pumping consistency and extrusion lines. The new extrusion gear pump series extrex® RV/RB from MAAG raises the performance of gear pumps for elastomer extrusion and [...]

Application: Extrusion • Industry • Polymer production • Wire and cable jacketing
Category: Gear Pumps • Thermoplast Extrusion Pumps

extrex⁶ ER

Elastomeric processing requires positive displacement devices that gently convey high viscosity rubber through the system. The specific low-compression tooth design of the extrex⁶ ER extrusion gear pump enables transfer, booster, or metering gear pump applications to achieve both high pressure [...]

Application: Extrusion • Polymer production • Wire and cable jacketing
Category: Gear Pumps

extrex⁶ EX

Processing thermoplastic polymers requires positive displacement devices that gently convey any kind of thermoplastic grades from high to low viscosity through the pump system. The specially designed, low-compression tooth design allows the extrex® transfer, booster, or metering gear pump of [...]

Application: Compounding • Extrusion • Masterbatch • Recycling • Wood flour
Category: Thermoplast Extrusion Pumps

F-Series

F-Series chemical transfer gear pumps are corrosion-resistant and heatable stainless steel conveying units that satisfy the stringent quality requirements of today's chemical processing industry. Thanks to the extensive range of components and materials of construction to choose. from, Gear pumps [...]

Application:
Category: Gear Pumps

hydrolub®

Continuously operated equipment calls for reliable components. Whether in lubrication oil applications or in processing plants, a external gear pump is required to work inconspicuously yet reliably. This is precisely the environment in which tried and proven gear pumps from [...]

Application: Extrusion • Industry • Wire and cable jacketing
Category: Gear Pumps

polyrex⁶ PR

Processes in the manufacture of polyolefins like polyethylene and polypropylene require high-pressure gear pumps which build up pressure for the units after the compounder, meaning for extrusion and pelletizing. The new performance-driven geometry of the x6 class of polyrex® results [...]

Application: Polymer production • Thermoplastic elastomers
Category: Polymer Production Pumps

refinex® refitherm®

Chemical, refinery, and industrial plant applications are demanding. High process pressures and high temperatures are commonplace in such environments. This is precisely the environment of polymer production for industrial applications in which tried and proven external gear pumps from MAAG [...]

Application: Industry • Polymer production
Category: Gear Pumps

thermorex® TRO/TRP

Polymer processes and polymer applications require polymer transfer pumps which will constantly and reliably feed oligomers and prepolymers through the system. The liquid polymer pump design is highly suitable for low viscosity. Thanks to thermorex® TRP and TRO, reactors no [...]

Application: Polymer production • Thermoplastic elastomers
Category: Polymer Production Pumps

thermorex⁶ TR/TB/TP

Polymer processes require booster pumps and polymer metering pumps that gently process both high and low viscosity plastic melt through the polymer processing system.Specially designed low-compression teeth allow the thermorex® transfer, booster or metering gear pumps of the x6 class [...]

Application: Polymer production • Thermoplastic elastomers
Category: Polymer Production Pumps

trudex®

MAAG gear pumps guarantee constant conveying in extrusion lines and thus highest product quality. With its robust construction, the new trudex® high-pressure gear pump enables operation in pressure ranges up to 700 bar, which is the upper limit for conventional [...]

Application: Compounding • Extrusion • Masterbatch • Recycling • Wood flour
Category: Thermoplast Extrusion Pumps

vacorex⁶ VX

MAAG introduces the vacorex® x6 class polymer extraction gear pump. vacorex⁶ ideally fulfills modern polymer production processes which require polymer pumps that can discharge at high pressure despite very low fill level and high vacuum conditions in the reactor/devolatilization vessel.MAAG [...]

Application: Polymer production • Thermoplastic elastomers
Category: Polymer Production Pumps

viscorex® VR

Polymer processes in the polymer industry require units that gently discharge low and high-viscosity plastic melts from reactors and degassing equipment. The MAAG polymer extraction pump systems and viscorex® transfer gear pumps feature the excellent fill behaviour and short residence [...]

Application: Polymer production • Thermoplastic elastomers
Category: Polymer Production Pumps

Gear pumps for perfect plastics

Essentially, gear pumps are simple devices which transport plastic melts and other media, along with the empty volume of gear toothing in the pump shaft, in the extrusion process or in the process to manufacture plastics in the chemical industry. They comprise a small number of key components, such as housings, shafts, bearings, and shaft packing. On closer inspection, the simple system is seen to be much more complex. Since MAAG gear pumps usually process polymer melts, the behavior of these long-chain molecules must be understood and taken into account when subjected to the relevant stresses. Reaction to high temperatures and shear rates is of great importance here. The dwell time and the distribution of the dwell time in the melt pump must also be taken into account.

The plastics manufacturing industry needs maximum efficiency in production processes, and demands the lowest possible temperature rise in the bearings and in the polymer melt being processed. Less play between the components quickly improves efficiency. However, this can have a negative effect on product quality and affect the function of the gear pump in the extrusion process. There is a risk that shafts and bearings will seize up.

The research, development and manufacture of gear pumps for extrusion and other fields of application in the production and processing of plastics are part of MAAG’s corporate history. It has built up great knowledge over many decades of cooperation with customers worldwide, which is fully reflected in the x6 class melt pump. Gear pumps for extrusion and plastics production in the chemical industry are used today to pump a wide variety of polymer classes. New knowledge is continually flowing into the development and enhancement of melt pumps.

The ideal gear pump for extrusion of polymers

Good volumetric efficiency enables pumping at slower speed, reduced shear rate, lower temperature, and tight dwell time distribution. Improving these attributes results in better pumping rate, higher polymer quality, greater reliability, and longer service life. At the same time, energy consumption is significantly reduced. MAAG melt pumps and extrusion pumps adhere to that principle.

In the plastics manufacturing chemical industry, the pump geometry has a considerable influence on the degassing stage, where minimal filling levels in the tank directly connected to the gear pump lead to a shorter dwell time. This is especially interesting for manufacturers of easily degradable polymers because it means volatile compounds can be minimized. The x6 class gear pump in particular achieves an extremely low NPSHr (net positive suction head required) pressure value, and so can process polymer melts of up to 200,000 Pas (0 shear viscosity), depending on pump size.

The operating pressure of the gear pump has a major influence on product quality in extrusion. The higher the pressure, the finer the filters and screen changers that can be used downstream of the pump. High volumetric efficiency and low pulsation ensure consistent polymer quality and uniform output of the end product.

Gear pumps and extrusion pumps from MAAG

The smaller the pump the better for the customer’s plant planning. MAAG pumps are optimized to use the given installation space to attain maximum plant capacity.

Energy, energy cost and energy consumption are crucial aspects of plant planning. MAAG gear pumps optimize energy consumption.

MAAG pumps can be used for a wide range of polymers. There is a wide variation between high-viscosity and low-viscosity products. The pumping pressure can be increased when processing low-viscosity polymers.

MAAG extrusion pumps and melt pumps offer long service life. Even lower bearing temperatures of the x6 class melt pump generation – thanks to the high efficiency of the pump – extend it even further, and provide for an even more stable lubricating film between the shaft and bearing. That makes the pumps extremely reliable.

The optimal solution for discharge from reactors is an important aspect in polymer production. The key in this is the difference between extraction from containers in production processes entailing standard requirements for the NPSH value (such as PET) and other processes where the required filling level in the connected container must be minimized. MAAG offers different housing designs for extraction melt pumps to meet the different requirements, so as always to be able to realize an economical and technically optimal solution.

The increased torque load capacity of MAAG gear pumps (melt pumps) boosts safety during start-up and operation, and aids general safety in production.

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