Extrusion gear pump
Extrusion gear pump
Melt pumps for extrusion
The extrusion gear pump is mainly used in connection with extruders or kneaders. They lower the naturally existing pulsation and uneven transportation, particularly of single-screw extruders.
The extrusion pump is also used as a melt pump. It takes over the establishment of the required transport pressure, which is needed for the downstream equipment.
Efficient pressure build-up
In the gear pump, the pressure build-up occur significantly more efficiently than in the extruder itself. The extruder is relieved through the use of an extrusion pump. Significantly less energy or heat is added to the polymer. The melt pump thereby contributes to the gentlest possible transportation. The EXTRU pump is indispensable for the production of precise foils or micro-granulate.
Robust and flexible
The robust design and wear-resistant materials make the EXTRU indispensable for extrusion. It can also be used to transport natural rubber and soft PVC through different special designs.
The WITTE fast-changing color design is perfect for master batch applications with frequently changing colors.
Technical data
Housing
Heat-resistant carbon steel, for example, 1.6582 · Stainless steel 1.4313 · optional with coating · optional with coating
Gear Shafts
Tool steel · Nitriding steel · Special steel · optional with coating · Helical gearing · Herringbone gearing (for transportation with very low pulsation)
Shaft seals
Threaded shaft seal · Stuffing box
Heating
Electric through heating cartridges · Cover heating optional
Friction bearing
Tool steel · NiAG (nickel-silver) · Aluminum bronze · Special materials · optional with coating
Operating parameters
Viscosity
Up to 40.000.000 mPas
Temperature
Up to 400°C
Suction pressure
Vacuum up to max. 120 bar
Transport pressure / differential pressure
Up to 250 bar. Special designs also for higher differential pressures
Pump sizes
From 4,7-22-22 (4,7 cm3/U – 10 kg/h) to 12.000-280-280 (12.000 ccm/U). Sizes with smaller gears for higher differential pressures are possible, p.e. 690-140-90.
