Extruder motor

At a screw speed of 56 rpm and a rate of 120 kg/h and with the motor operating at full current (full torque), the extruder motor would be inputting a specific energy of 1440 J/g to the resin via the screw. Since the 80 mm diameter extruder is expected to require only 750 J/g, the motor is expected to operate at about 52% of the maximum current. Thus, the extruder has enough power to operate the proposed screw design at 120 kg/h and a screw speed of 56 rpm. 

Extruder motors are usually electric, but some systems utilize hydraulic motors. For example, injection molding machines use hydraulics to develop clamp tonnage. Electric motors may be of the direct current (DC) or alternating current (AC) types. Traditionally, DC motors, which regulate speed through voltage control, have been more popular because they could provide the necessary power at a lower cost. However, recent advances in frequency control - the technique used to regulate speed in AC motors - have caused this type of motor to become more widely used. 

Two insulated wires with identical geometric parameters were produced on a 20-L/D single-screw cable extruder with a 80-mm screw diameter. The diameter of the copper wire was 1.78 nun, and the wall thickness for the insulation was 0.8 mm. For one wire the insulation was compound 1 (filler combination by ATH-organoclay) and for the other wire the optimized compound 2A (filler combination by ATH-organoclay-MWCNTs) was used as insulation. The MWCNT-based compound 2A showed a remarkably increased viscosity over that of the standard nanocomposite compound 1, as indicated by reduced revolutions per minute of the screw and increased power takeup by the extruder motor a high-pressure capillary viscosimeter showed a higher viscosity for compound 2A for all shear rates up to 3000 s ... 

Clamp in open position (2) hydraulic power pack (3) extruder motor (4) extruder (5) accumulator head (6) supporting frame (7) supporting columns... 

FIG. 18-50 Intermeshing corotating twin screw extruder (a) drive motor, (h) gearbox, (c) feed port, (d) barrel, (e) assembled rotors, (f) vent, (g) barrel valve, (h) kneading paddles, ( ) conveying screws, (/) splined shafts, (k) blister rings, (APV Chemical Machinery, Inc.)... 

Extruders 3.3.S.1 Heated 3.XS.2 Non-Heated 3.XS.3 CoQtad 3.3.S.4 Non-Coolad Alternating Running 1 -4 1- Catastrophic a. Fails while Running a.1 Motor Failure a.2 Screw Failure a.3 High Viscosity b. Seal Rupture - External c. Fails to Start on Demand d. Fails to Stop on Demand... 

HMX, binders, etc b) combination of ingredients into blends, grains or formulations, such as cannon powder, Comp B, extruded doublebase proplnt grains, etc c) loading of warheads, bombs, rocket motors, etc, with the blends or formulations and d) final assembly and pack-out of complete munitions, including metal parts... 

In 1976, Meluch and Campbell at General Motors obtained a patent10 for a steam hydrolysis depolymerization of PUR. High-pressure steam hydrolyzes flexible PUR foams rapidly at temperatures of 232-316°C to form diamines and polyols. The diamines are distilled and extracted from the steam and the polyols are obtained from the hydrolysis residue. In 1977, Bayer AG obtained a patent for a continuous PUR hydrolysis process using a specially designed extruder.11... 

A precision knife cutter whose cutting surface is made of stainless steel will be designated. The knife edge should be 24 in long. The product is to be Vs in cylinders. The product rate is 2,000 lb/hr through each extruder. This should require about a 60 hp motor.41... 

The domestic use pattern for lead in 1990 was as follows lead-acid storage batteries, used for motor vehicles, motive power, and emergency back-up power, accounted for 80% of total lead consumption ammunition, bearing metals, brass and bronze, cable covering, extruded products, sheet lead, and solder, represented 12.4% the remaining 7.6% was used for ceramics, type metal, ballast or weights, tubes or containers, oxides, and gasoline additives (USDOC 1992). 

Electrical sleeving, wire and cable insulation and jacketing, appliance wires, motor lead wires, compact wire and cables, airframe wiring, extruded coatings... 

All single-screw extruders have several common characteristics, as shown in Figs. 1.1 and 1.2. The main sections of the extruder include the barrel, a screw that fits inside the barrel, a motor-drive system for rotating the screw, and a control system for the barrel heaters and motor speed. Many innovations on the construction of these components have been developed by machine suppliers over the years. A hopper is attached to the barrel at the entrance end of the screw and the resin is either gravity-fed (flood-fed) into the feed section of the screw or metered (starve-fed) through the hopper to the screw flights. The resin can be in either a solid particle form or molten. If the resin feedstock is in the solid form, typically pellets (or powders), the extruder screw must first convey the pellets away from the feed opening, melt the resin, and then pump and pressurize it for a down-... 

Finally, the concept of viscosity and resistance to flow of polymers as a function of shear rate will be discussed because there is often a misconception regarding the dissipation in an extruder at high shear rates when the viscosity is in the power law region. As previously discussed, the viscosity decreases as a function of increasing shear rate as shown in Fig. 3.23. Often this reduction in viscosity is misinterpreted as a reduction in the amount of power needed when the polymer is sheared at high rates. For an extruder, the misinterpretation would be that less motor power would be required to operate the machine at higher screw speeds. It... 

The new commercial process was based on the lab process and has the target performance shown in Table 9.2. To achieve this performance, an 80 mm diameter extruder with an L/D ratio of 28 was specified. The extruder was built with a 100 kW motor and a gear box such that the maximum speed of the screw was 117 rpm. A gear pump was positioned downstream of the extruder such that the extruder only needed to generate 6 MPa of pressure at all rates. 

Pel required power from the motor to the process for an extruder meter of ... 

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