melt pumps

Melt-pumps for Extrusion and Compounding

There is a blacksmith for pumps as well as for ideas in high-end extrusion technology, manufacturing melt-pumps for different applications.

Pumpwerkstrasse (German word for “Pump Factory Street”) is the right address of eprotec in Zürich/Regensdorf Switzerland. Since last century there were developed and manufactured pumps. High precise melt-pumps for extrusion and compounding designed with know-how, experience and as well designed exactly according application.

Melt-pumps are standard in extrusion-lines for long time, especially for sheet extrusion as well as in compounding. The generation melt-X is eprotec’s all-round talent. With all its modifications it is design-able exactly according application for film- and sheet-extrusion as well as for compounding.

Melt-pumps care for constant output

Melt-pump melt-X minimizes pressure variations in extrusion-lines, which are mainly caused by feeding fluctuations in extruder itself.

Melt-X cares for constant throughput; it relieves the extruder-screw from pressure built up by tooling unit and enhances the output of extrusion-lines.

Years of experience in extrusion and pump-designing are background of eprotec’s staff. Manufacturing partners produces the pumps resp. the parts - especially designed according its application - with state of the art tooling machines.

Designed according its application

eprotec’s pumps are always design according customers application (never taken out of a shelf). These melt-pumps are designed according processed polymer as well as according properties and amount of fillers.

Know-how in tooling-materials, in right gap dimensions in the combination of shafts, bearings and shaft seals allows the use eprotec’s pumps even with aggressive and abrasive fillers as well as processing thermally unstable polymer melts such as PVC.

Experience with fillers like glass-fibre, barium sulphate (BaSO4) and chalk (CaCO3) leads to extensive know-how in tooling-materials and design.

Correct selection of tooling-material

High-tech tooling materials are used in the modular designed eprotec’s melt-pumps melt-X.

Special coatings are responsible for long lifetime of melt-pumps even if corrosive and aggressive as well as highly filled melts are processed.

The teeth of the shafts in the melt-X extrusion pumps are manufactured in a way that full nitration-depth are provided (developed for no grinding after nitration),

Heating with know-how

Also the heating cartridges are designed especially for the use in extrusion pumps. Less energy input near the melt-channel reduces thermal degradation in extrusion-process.

Optimized for melt-flow.

Melt channels are designed for high flow-speed and short residence time in eprotec’s extrusion pump melt-X.

The bearings are lubricated with the polymer. Small part of processed polymer is guided from high-pressure side through bearings to low-pressure side.

Pressures sensors in melt-pump’s body

The holes for the pressure probes are located in the body of eprotec’s extrusion melt-pump. They are located in the even part of the melt-flow optimized channel. No steps in the channel are created where melt could stick.

Rework of extrusion melt-pumps

Same know-how is available for repairing existing melt-pumps. Spare-parts for most melt-pumps in the market are available, no matter who origin supplier was.

Melt-pumps are standard in extrusion of high quality products; melt-X with its outstanding properties is the ideal tool for daily use with standard material, frequent material changings as well as in high-performance extrusion with high speed extruders.


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