Screw barrier

Schlafi, D. and Zweifel, Y., Barrier Screws in Helically Grooved Barrels Operating Characteristics and Implications for Simulation Models, SPEANTEC Tech. Papers, 47, 195 (2001)... 

Figure 6.24 Schematic for the zones of the new barrier screw melting concept. The cream...

Figure 6.25 Qualitative shapes of X and Tbed dimensions and melt film thicknesses for a barrier screw model with a transverse barrier flight (a) top view of the solids channel and the entry to the metering section, and (b) side view of the solids channel and the entry to the metering section. The cream color represents molten resin...

Table 11.4 Screw Channel Dimensions for an 88.9 mm Diameter, 33 L/D Barrier Screw for Running an LDPE Resin...

Figure 11.17 Photograph of the main flow and stagnant regions on a barrier screw running LDPE resin [22]. The white polymer is the main flow region, and the dark material is degraded resin in the stagnant region...

Figure 11.19 Axiai pressure profiie for the barrier screw. Sections of the screw at zero pressure are partiaiiy fiiied with resin and are a iocation for the decomposition of the resin. The solid line in this figure was caicuiated using the methods described previousiy, and the dashed line represents the expected pressure profile and was not calculated...

Table 11.6 Screw Channel Dimensions for a 114.3 mm Diameter, 32 L/D Barrier Screw for...

Figure 11.29 Photograph of the barrier screw after running 25 injections of a gray-colored IRPS resin after a black resin. The black-colored resin shows regions that did not purge well and thus were stagnant...

Table 11.11 Screw Channel Dimensions for a 140 mm Diameter, 20 L/D Barrier Screw Running a PP Resin in an Injection-Molding Operation...

High-Performance and Barrier Screws for Improved Rates... 

Figure 14.1 Schematic for a barrier melting section (courtesy of Jeff A. Myers of Robert Barr, Inc.). The schematic is for a Barr-Ill barrier screw...

Figure 14.5 Schematics for the Barr-ll and Barr-Ill barrier screw technologies a) full-length schematic of a Barr-ll barrier screw, b) expanded view of the barrier entry section of a Barr-ll screw, c) full-length schematic of a Barr-Ill barrier screw, d) expanded view of the barrier entry section of a Barr-Ill screw, and e) expanded view of the crossoverflow rearrangement section at the exit of Barr barrier screws (Schematics courtesy of Jeff Myers of Robert Barr, Inc.)...

Steward, E., Barrier Screws, Their History and Their Function, SPE ANTEC Tech. Papers, 48, 69 (2002)... 

Christiano, J. P. and Thompson, M. R., A New Barrier Screw Design Utilizing Solid Bed Deformation with Forced Melt Removal, SPE ANTEC Tech. Papers, 46, 78 (2000)... 

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