EXTRU - II b - Reliable Extrusion Gear Pump Brochure

CHEMEXTRUPOLYBOOSTERPUROEXTRU II bExtrusion gear pumpEXTRU II bThe 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 WITTE - quick color change version lends itself particularly to master batch applications with frequent changes of color. In order to prevent the pump‘s drive shaft from being driven/pushed out of the housingwhen the suction pressure exceeds 10 bar (extruder conveying pressure), the drive shaft must be pressurewise relieved. It protrudes from both sides of the housing and is sealed, so that atmospheric pressure predominates on both sides of the drive shaft. Technical FeaturesHousing: Heat resistant carbon steel, e.g. 1.6582 (4340), stainless steel e.g. 1.4313 (E415), optional: surface coatingGears : Tool steel, nitrided steel, special steel, optional: surface coating, helical gearing, herringbone gearing (for extremely low-pulsation conveyance)Friction Bearings: Tool steel, Al-bronze, NiAg (nickel-silver), special materials, optional: surface coatingShaft Seal: Viscoseal, stuffing box Heating Systems: Electrically, by means of heating cartridges, optional: cover heatingApplication ExamplesPolymers: PS, PET, PVC, PC, PA, PMMA, HDPE, LDPE, LLDPE, PP, Polysulfone, PEEKFoodstuffs: Liquorice, chewing gumPump SizesFrom 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) SealsOperating ParametersViscosity: Up to 40.000 PasTemperature: Up to 400 °C (752 °F)Suction Pressure: Up to max. 120 bar (1.740 psig)Differential Pressure: Up to 250 bar (3.626 psig), special models also available for higher differential pressuresThe values listed are maximum values and must not coincide under certain circumstances. Viscoseal (VS)Viscosity:50 to 40.000 Pas Temperature: max. 350 °C (662 °F)The viscoseal is the standard seal for WITTE EXTRU- and BOOSTER- pumps. This is a dynamic seal for high viscosities and suction pressures. It can be provided with heating or cooling. The dynamic seal is suitable for high pressures and temperatures. Its range of use is limited by the suction pressure and the viscosity of the medium being conveyed (at least 50 Pas). The viscosity can be increased by an additional cooling system if necessary.The stuffing box can be used as an additional seal for the viscoseal. The stuffing box is a simple (static) seal for WITTE gear pumps. It can be provided with buffering if so desired. The range of applica-tion is similar to that of the viscoseal. The standard material used for the packing is made of expanded pure graphite with structural textile fibers. But it goes without saying, that other materials are also available.Viscosity (stuffing box): max. 10.000 Pas Temperature: max. 350 °C (662 °F)Stuffing BoxSeals24000 22000200001800016000140001200010000 9000 8000 7000 6000 5000 4000 3000 2500 2000 1500 1000 800 600 400 350 200 100 50 10 1 0,1 00 1 5 10 20 30 40 50 60 70 80 90 100110120130140150160170180190200Pump speed [1/min]Flow rate [l/h] Driving speed limit forPET, TPU, PB, PPDriving speed limit for PE-LD, PE-HD, PSDriving speed limit for PMMADriving speed limit for PE-HD for pipes, PE-LLDSpec. displacement volume (ccm/U)Pump size A B C D E F G H I J K L M N O Weight1 (22/22) 99.6 142.1 100 48 90 11 22.5 8x45 66 58 92 84 28 8xM8 40,5 6 Kg2 (28/28) 134.9 173 135 59 109 14 22.5 8x45 90 65 116 108 32 8xM10 50 15 Kg2 (28/28) 185.9 215 150 76 134 18 22.5 8x45 110 75 145 136 42 8xM12 58 20 Kg4 (45/45) 235.9 316.7 204 104.5 203.5 22.5 22.5 8x45 750 90 195 185 55 8xM16 99 50 Kg5 (56/56) 281.5 368 230 120 239 28 22.5 8x45 185 100 230 218 68 8xM20 119 80 Kg6 (70/70) 350.4 430.8 260 145 276 35 22.5 8x45 235 120 290 275 80 8xM24 131 150 Kg7 (90/90) 430.4 505.3 335 181 312 45 15 12x30 300 150 362 346 100 12xM24 147 280 Kg8 (110/110) 495.9 563 420 215 335 55 15 12x30 340 180 430 400 125 12xM30 120 500 Kg9 (140/140) 620 800 550 300 485 70 15 12x30 390 225 550 530 150 12xM39 235 1000 Kg10 (180/180) 817 1040 680 418 617 90 11.25 16x22.5 440 250 700 680 200 16xM39 297 1830 KgSize Spec. displace-ment volume(cm3/rev)Capacity (l/h)*1 (22/22) 4,7 3-562 (28/28) 10,2 6-923 (36/36) 25,6 15-2304 (45/45) 46,3 28-4175 (56/56) 92,6 55-7226 (70/70) 176 105 - 13707 (90/90) 371 222 - 28908 (110/110) 716 430 - 47009 (140/140) 1.482 900 - 885010 (180/180) 3.200 1920 - 1700011 (224/224) 6.100 3660 - 3200012 (280/280) 12.000 6590 - 58000EXTRU-DimensionsApplication ExamplesPump Sizes* (Depending on the fluid characteristics and operating conditions)Extruder Sieve changerEXTRUIncrease pressureMeteringExtruderExtruderToolPlasticisingToolPumpPlasticisingConveying and com-pressingConveying and com-pressingHomogenisingHomogenisingPressure built upPressure built up?T with Pump?T without PumpPressure TemperatureSize / Capacity / Displacement VolumeWITTE PUMPS & TECHNOLOGY GmbHEsinger Steinweg 44 aD-25436 Uetersen / Hamburg / GermanyT: +49 (0) 4122 / 92 87- 0 F: +49 (0) 4122 / 92 87- 49info@witte-pumps.comwww.witte-pumps.comWITTE WORLDWIDE 05/2012 EXTRU II ENG REV1