Melt Pumps
Melt pumps for extrusion
WITTE melt pumps are designed for use with extruders. As a result of the extruder, these pumps reduce the natural pulsation and build up the required pressure for the die.
Optionally, the EXTRU melt pump series can be equipped with our proven herringbone toothing. Particularly demanding melts are thus conveyed very gently. In contrast to an extruder, the pressure build-up by a melt pump is much more efficient. Dies can thus be filled evenly without fluctuations in delivery.
This effectively increases the quality of the end product and significantly reduces the reject rate. The EXTRU series is available as square or round version. It has a modular design and can be extended by various modifications, such as a quick colour change version.
- Melt pumps from 3 l/h to 17,000 l/h flow rate
- Melt pumps from 4.7 ccm/rev up to 3,200 ccm/rev delivery volume
- Melt pumps with a delivery pressure of up to 350 bar
- Melt pumps with suction pressures of 120 bar and differential pressures up to 250 bar
- Melt pumps with viscosities up to 30,000 Pas and temperatures up to 350 °Grad
Technical data of our melt pumps
Technical fields of application:
- Viscosity up to 30,000 Pas
- Temperatures up to 350 °C
- Differential pressures up to 250 bar
- Suction pressure 120 bar
- Feed pressure up to 350 bar
Flow rates:
- Capacity from 3 l/h up to 17,000 l/h
- Flow rate from 4.7 ccm/rev up to 3,200 ccm/rev
Melt pumps with housing made of:
- High-temperature carbon steel
- Optionally with coatings for increased load capacity
- 1.6582
- Stainless steel 1.4313
Melt pumps with gear wheels and friction bearings made from:
- Plasma-nitrided tool steel
- Tool steel
- NiAG
- Shafts with herringbone gearing on reques
Melt pumps with delivery volume of:
- 4.7 ccm/rev
- 10.2 ccm/rev
- 25.6 ccm/rev
- 46.3 ccm/rev
- 92.6 ccm/rev
- 176 ccm/rev
- 371 ccm/rev
- 716 ccm/rev
- 1,482 ccm/rev
- 3,200 ccm/rev
- 6,100 ccm/rev
- 12,000 ccm/rev
Melt pumps with flow rates from:
- 3 - 56 l/h
- 6 - 92 l/h
- 15 -230 l/h
- 28 - 417 l/h
- 55 - 722 l/h
- 105 - 1,370 l/h
- 222 - 2,890 l/h
- 430 - 4,700 l/h
- 900 - 8,850 l/h
- 1,920 - 17,000 l/h
- 3,660 - 32,000 l/h
- 6,590 - 58,000 l/h
Technical specifications:
- Threaded shaft seal made of aluminium bronze
- Cooling units for seals made from hardened steel are possible.
- Electric heating by heating cartridges
- Rectangular housing shape
- Round housing shape
- Special housing for quick-action paint change of the product without changeover
Applications of our melt pumps
WITTE melt pumps are suitable for the following applications.
Media to be fed and metered-out:
- PS
- PET
- PC
- PA
- PMMA
- HDPE
- LLDPE
- LDPE
- PP
- Polysulphones
- PEEK
- Elastomers
- Thermoplastics
- High-filled plastics
Further fields of application of our melt pumps combined with:
- Pelletizing units
- Screen changers
- Compounding plants
Molten-Mass Pumps, Extrusion Pumps
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