Extruder schematic view

A schematic view of an extruder is shown in figure 1. The extruder barrel is essentially a ferrous alloy cylinder, with aluminum block heaters attached to the outside. There are several temperature control zones along the length of the extruder. Measurement thermocouples are installed in the extruder barrel itself. Barrel temperature is used to control the temperature of the polymer melt. Energy from the heaters is conducted both radially and axially in the barrel. Below, figure 2 shows a sketch of the extruder barrel, with the heaters and the temperature measurement points used in this paper marked. 

Fig. 6. (a) Schematic view of an extruder channel with an undulating baffle, (b) B, C, D Steady flow streamlines with and without baffles for initial condition A. E, F Mixing in a cavity flow with an oscillating baffle. The upper plate moves with a steady velocity while the lower plate with the baffle undergoes linear oscillatory motion (Jana, Tjahjadi, and Ottino, 1994). 

Fig. 3. Schematic view of a single-screw extruder showing a double-flighted screw in a cylindrical barrel.

Figure 8.17 Extruder schematic showing location of the extrudate cross-sectional views for the melting capacity and mixing experiments...

In Germany a machine of the Niepmann type has been adapted for cartridging dynamite [7]. A schematic view of its operation is shown in Fig. 179. The explosive supplied through funnel (/) is pushed out through worm (2) into conduits (4) and (5), from which it is ejected by pistons (5). The empty paper cases are fed by conveyer ( ) into slots on the rotating table (7). When the cases reach position (8), a charge of plastic material, extruded from the orifice (6), is slipped into them. Further rotation severs the rods of dynamite while the cases, already filled, are passed to... 

Fig. 217. Schematic view of the functioning of a press for extruding strips and tubes...

Fig. 6.28 Schematic view of the normal stress extruder. Polymer melt is placed between the disks. The upper disk is attached to a rotating shaft at frequency of rotation fi. A pressure profile of increasing pressure toward the center develops, and the melt is extruded through the die.

Fig. 9.2 Schematic view of a melt extruder. The extruder is equipped with a feed port and a pelletizing plate.

Fig. 9.4 Schematic views of screw characteristic lines for Newtonian fluids and isothermal flow. The points where the screw and die characteristic lines cross are the operating points of the extruder. The effect of the screw speed and the channel depth on the operating points is demonstrated.

Fig. 10.7 Schematic view of the CM/single screw extruder combination used in polymer compounding operations. The chute, connecting the two processing machines, transfers the molten and mixed stream at low pressures to the throat of the melt pump SSE, which generates the pressure needed for pelletization. [Reprinted by permission from E. L. Canedo and L. N. Valsamis, Farrel Continuous Mixer Systems for Plastics Compounding in Plastics Compounding—Equipment and Processing, D. B. Todd, Ed., Hanser, Munich, 1998.]...

Fig. 7.9. Schematic view of feeder control, lab control and melt sensor-based control. Keys 1, thermoplastic storage 2, weigh feeder 3, pigment storage 4, loss-in-weight feeder 5, extruder 6, vacuum system 7, strand die 8, water bath 9, air knife 10, strand pelletiser. After Sohl [9]. Reproduced by permission of C.H. Sohl, Experimental Station, Du Pont...

Fig. 6.2-71 View into an operating spheronizer and schematic presentation of its operation (courtesy LCI, Charlotte, NC, USA) Fig. 6.2-72 a) Extrudates, b) products from different spheronization treatments after 5 s, c) after 30 s, e) after several minutes (courtesy LCI, Charlotte, NC, USA)...

FIGURE 7.4 Schematic of a typical extrusion die showing the various parts of the die (side view). The manifold distributes the melt from the extruder uniformly over the width of the die while the restrictor can be used to compensate for variations in flow rate across the width of the die. The lips give the melt stream the desired dimensions and shape. (Note Because of die swell the dimensions of the extrudate may be considerably different from those of the die lips.)... 

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