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EXTRU

Product catalog summary

Overview: The EXTRU II b is an extrusion gear pump primarily used with extruders or kneaders to reduce pulsation and irregular conveyance, especially in single-screw extruders. It enhances pressure build-up more efficiently than extruders, resulting in less energy transfer and gentler product conveyance. It is crucial for precision film extrusion and micro granulate pelletizing, minimizing production downtime.

Technical Features:

Housing: Made from heat-resistant carbon steel or stainless steel, with optional surface coating.
Gears: Constructed from tool steel, nitrided steel, or special steel, with optional surface coatings and gearing options for low-pulsation conveyance.
Friction Bearings: Available in tool steel, Al-bronze, NiAg, and special materials, with optional surface coatings.
Shaft Seal: Options include Viscoseal and stuffing box.
Heating Systems: Electrically heated via cartridges, with optional cover heating.

Application Examples: Suitable for polymers like PS, PET, PVC, and foodstuffs such as liquorice and chewing gum.

Pump Sizes: Ranges from 22/13 (2.78 cm³/rev) to 280/280 (12,000 cm³/rev), with intermediate sizes available.

Operating Parameters:

Viscosity: Up to 40,000 Pas.
Temperature: Up to 400°C (752°F).
Suction Pressure: Up to 120 bar (1,740 psig).
Differential Pressure: Up to 250 bar (3,626 psig), with special models for higher pressures.

Seals:

Viscoseal: Suitable for high viscosities and pressures, with heating or cooling options.
Stuffing Box: A static seal with buffering options, made from expanded pure graphite.

Performance Data: The document includes detailed tables and graphs illustrating pump sizes, specific displacement volumes, and flow rates, highlighting the capacity range for different pump sizes.

Global Presence: WITTE PUMPS & TECHNOLOGY operates worldwide with locations in Germany, Russia, China, USA, and Malaysia.

Catalog excerpts

Extrusion gear pump

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EXTRU II b The EXTRU is mainly used in conjunction with extruders or kneaders. It reduces the natural pulsation and irregular conveyance, particularly in single-screw extruders. The pressure build up in the gear pump is more efficient in comparison to the extruder. Because of this, less energy or heat is transferred into the polymer and the product is conveyed in a more gentle manner. The EXTRU is essential for precision films extrusion or micro granulate pelletizing. The EXTRU is an essential component of modern extrusion lines, its robust design minimizes down times of production lines. The...

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Seals Pump Sizes From 22/13 (2,78 cm3/rev) up to 280/280 (12.000 cm3/rev). Intermediate sizes, with narrower gear wheels for higher differential pressure, are possible, e.g. 140/90 (690 cm3/rev) Operating Parameters Viscosity: Suction Pressure: Differential Pressure: Up to 250 bar (3.626 psig), special models also available for higher differential pressures The values listed are maximum values and must not coincide under certain circumstances. Seals Viscoseal (VS) The viscoseal is the standard seal for WITTE EXTRU- and BOOSTER- pumps. This is a dynamic seal for high viscosities and suction pressures....

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Driving speed limit for PE-LD, PE-HD, PS Driving speed limit for PMMA Driving speed limit for PET, TPU, PB, PP Driving speed limit for PE-HD for pipes, PE-LLD Spec. displacement volume (ccm/U)

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Size / Capacity / Displacement Volume Application Examples Tool ∆T without Pump Screen changer Conveying and compressing Increase pressure Metering Pump Sizes Size Spec. displacement volume (cm3/rev) * (Depending on the fluid characteristics and operating conditions) EXTRU-Dimensions Pump size

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WITTE WORLDWIDE WITTE PUMPS & TECHNOLOGY GmbH Tornesch, Germany OOO WITTE PUMPS & TECHNOLOGY Moscow, Russia WITTE PUMPS & TECHNOLOGY Shanghai Ltd., China WITTE PUMPS & TECHNOLOGY LLC Lawrenceville, GA, USA WITTE PUMPS & TECHNOLOGY GmbH Lise-Meitner-Allee 20 D-25436 Tornesch / Hamburg / Germany P: +49 (0) 4120 70659-0 F: +49 (0) 4120 70659-49 [email protected] www.witte-pumps.com WITTE PUMPS & TECHNOLOGY Kuala Lumpur, Malaysia

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EXTRU

EXTRU

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