Co rotating twin screw extruder

Report 116 Compounding in Co-rotating Twin-Screw Extruders, Y. Wang, Tunghai University. 

PC PC/15% MWNT masterbatch 2 wt.% 105 2-cm Melt mixing in intermeshing co-rotating twin screw extruder... 

A mixture consisting of powdered polypropylene (59.91 g) and the step 1 product (90 mg) were tumble-mixed in a glass container for 24 hours. Thereafter the mixture (4.5 g) was compounded at 239°C using a small co-rotating twin-screw extruder. The sample required 4 minutes at a screw speed of 40rpm to be prepared. The extruded material only had a slight haze content. 

Potente H, Bastian M, Bergemann K, Senge M, Scheel G, Winkelmann T (2001) Morphology of polymer blends in the melting section of co-rotating twin screw extruders. Polym Eng Sci 41 222-231... 

Figure 3.38 Number and weight average of polyamide 6 domain sizes along the screws for a co-rotating twin screw extruder with special mixing elements.

H. Potente and U. Melish, Theoretical and Experimental Investigations of the Melting of Pellets in Co-rotating Twin-screw Extruders, Int. Polym. Proc., 11, 101 (1996). 

S. Bawiskar and J. L. White, A Composite Model for Solid Conveying, Melting, Pressure and Fill Factor Profiles in Modular Co-rotating Twin Screw Extruders, Int. Polym. Proc., 12, 1331 (1997). 

B. Vergnes, G. Souveton, M. L. Delacour, and A. Ainser, Experimental and Theoretical Study of Polymer Melting in a Co-rotating Twin Screw Extruder, Int. Polym. Process., 16, 351-362 (2001). 

Fig. 10.69 Locations of the thermocouple and pressure transducers used by Ishikawa et al. (113). Numerical velocity, pressure, and temperature field at cross-sections A-A, B-B, and C-C. [Reprinted by permission from T. Ishikawa, S. I. Kihara, and K. Funatsu, 3-D Numerical Simulations of Nonisothermal Flow in Co-Rotating Twin Screw Extruders, Polym. Eng. Set, 40, 357 (2000).]...

P. G. Andersen, Mixing Practices in Co-rotating Twin Screw Extruders, in Mixing and Compounding of Polymers, I. Manas-Zloczower and Z. Tadmor, Eds., Hanser, Munich (1994). 

B. Qian and C. G. Gogos, The Importance of Plastic Energy Dissipation (PED) to the Heating and Melting of Polymer Particulates in Intermeshing Co-rotating Twin Screw Extruders, Adv. Polym. Tech., 19, 287-299 (2000). 

C. G. Gogos, B. Qian, D. B. Todd, and M. H. Kim, A Predictive Melting Model for Polymer Particulates in Co-rotating Twin Screw Extruders, SPE ANTEC Tech. Papers, 47, 134-138 (2001). 

V. L. Bravo, A. N. Hrymak, and J. D. Wright, Numerical Simulation of Pressure and Velocity Profiles in Kneading Elements of a Co-rotating Twin Screw Extruder, Polym. Eng. Sci., 40, 525-541 (2000). 

Extruded Corn Meal with Thiamin Added. Degerminated yellow corn meal with 0.5% thiamin HC1 was extruded on a Werner Pfleiderer ZSK-30 co-rotating twin-screw extruder. The five heating zones of the barrel were held at 50°C, 76°C, 100°C, 134°C and 172°C, respectively. The product temperature was 180°C, the torque was 46% at 200 RPM and the pressure was 130-172 psi. The extrudate was allowed to cool to room temperature, then stored in glass vessels under nitrogen at 4°C. 

When 0.5% thiamin hydrochloride in degerminated yellow corn meal was extruded on a Werner Pfleiderer ZSK-30 co-rotating twin-screw extruder at the final product temperature of 180°C, numerous volatile components were generated. Table II lists the volatile compounds isolated and identified by purge-and-trap GC/MS method. 

Closely intermeshing co-rotating twin screw extruders occupy a dominant position among extruders and are used in a wide variety of applications. They are not only used extensively in the production, compounding, and processing of plastics, but also employed in large numbers in other branches of industry, e.g., the rubber and food processing sectors. 

As described in the preface, the first co-rotating twin screw extruders in the ZSK series were put into operation in 1957. According to Herrmann [1], ZSK is the abbreviation for the German expression Two-shaft kneading disc extruder (Zweiwellige Knetscheiben-Schneckenpresse). The expression twin-screw compounder used in the preface is the term... 

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