Melt-pumps for extrusion and compounding
eprotec's melt-pumps are installed in all applications in extrusion and compounding of plastics. Melt-pumps are installed to build-up constant pressure and guarantee constant output. Extruder screw is released from pressure, this enables higher out output and enhance flexibility of process. Smooth, efficient and constant pumping of plastic melt through extrusion-die guarantees product quality and dimension. eprotec offers its melt-pumps also together with drive-unit and control.
Retrofitting of extrusion-lines with melt-pumps leads primarily to a constant throughput. This is a requirement for dimension stability of extruded product. Retrofitting with melt-pumps leads mostly to higher output of extrusion-line. With a melt-pump installed in extrusion-line the screw is not anymore responsible for the full pressure build-up.
Spare-parts for melt-pumps no matter who original supplier was:
Main parts of melt-pumps are pump body, gears, bearings, special shaft seals and side covers. These are the spare-parts eprotec offers for nearly all existing pumps in the market. No matter who the original supplier was. These spare-parts are delivered cost-effectively and quickly.
Specifically designed for application:
eprotec melt-pumps are designed precisely for every application. According viscosity, throughput, processing temperature the pump-size, surface coating, tolerances e.g. are determined. Type and amount of fillers determine coating and/or bearing materials, etc.
Sizes and capacitiy range pf eprotec melt-pumps for extrusion
|Polymer||melt-X 1||melt-X 2||melt-X 4||melt-X 7||melt-X 10||melt-X 20||melt-X 40||melt-X 70|
|approximate data, according to density and processability|
Optimized melt-flow channel according experience in extrusion of plastic melt
Threads for pressure sensor are located in pump-body
Small melt channels for reduced residence time !
Heating cartridges with zones of different heating capacity (less energy in melt channel area)
These and more you find in file "important properties" in download area,
are available with different options.
|extrusion mode||compounding mode|
Please see also site for spare parts.
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.