Barrel grooved

This chapter provides a description of the solids conveying process and the theoretical models in the literature. The literature models will be presented before the experimental solids conveying data because only recently has experimental data become available for this process section. That is, the early theoretical models were developed without actual solids conveying data. Data will be presented regarding the temperature and forces that are associated with solids conveying of different polymers. Next, a comparison of the models with the experimental data will be provided. Both smooth bore and grooved barrel feed sections will be presented. The field experiences of the authors, however, are dominated by smooth bore extruders. 

Figure 5.33 Schematic of a water cooled grooved barrel feed casing. The grooves are axial (courtesy of Jeff A. Myers of Robert Barr, Inc.)...

Franzkoch and Menges [49] stated that the tip velocity of the flight should be In the range of 0.2 to 1.0 m/s for optimal grooved barrel performance. Designs should not be made with tip speeds higher than 1.0 m/s. For a 100 mm diameter extruder, a tip speed of 1.0 m/s corresponds to a screw speed of 190 rpm. 

The Potente-Schoppner model provides evidence for why extruders over 150 mm in diameter are not designed with grooved barrel feed sections. In general, resin... 

Wc channel width perpendicular to flight at the screw core Wgr width of the grooves in a grooved barrel... 

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

Womer, T. W., Wagner, J. R., Harrah, G., and Reber, D., An Experimental Investigation on the Influence of Barrel Temperatures on the Output of a Consfanf Depfh Screw wifh Grooved Barrel Feeding, SPE ANTEC Tech. Papers, 46, 259 (2000)... 

Spalding, M. A., Hyun, K. S., and Hoffmann, R., An Experimental Investigation of Solids Conveying in Smooth and Grooved Barrel Single-Screw Plasticating Extruders, SPE ANTEC Tech. Papers, 44, 136 (1998)... 

FIGURE 15.3 Schematic diagram of coaxial reactor (a), barrel reactor (b), and grooved barrel reactor (c) built for devulcanization of rubbers. 

FIGURE 15.9 Normalized gel fraction vs. normalized crosslink density of devulcanizied GRT obtained at various devulcanization conditions using the coaxial, barrel, and grooved barrel reactors. 

FIGURE 3 Schematic diagram of (a) coaxial reactor, (b) barrel reactor, and (c) grooved barrel reactor built for devulcanization of rubbers. 

Helibar Transfer Mixing Screw in Groove Barrel... 

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