Twin mixing elements

Fig. 26. Typical mixing elements for a co-rotating intermeshing twin-screw extruder...

Figure 3.37 Number and weight average of polyamide 6 domain sizes along the screws for a counter-rotating twin screw extruder with special mixing elements.

C. G. Gogos, M. Esseghir, D. W. Yu, D. B. Todd and J. Curry, The Twin-screw Mixing Element Evaluator On-line Performance Evaluation of Modular Twin-screw Mixing Elements, SPE ANTEC Tech. Papers, 40, 270 (1994). 

J. P. Christiano and M. Lindenfelzer, Investigation of Mixing Patterns in Co-rotating Fully Intermeshing Twin Screw Extruders Mixing Elements Using Dynamic Pressure Distributions, SPEANTEC Tech. Papers, 43, 78-83 (1997). 

T. Ishikawa, T. Amano, S. I. Kihara, and K. Funatsu, Flow Patterns and Mixing Mechanisms in the Screw Mixing Element of a Corotating Twin-screw Extruder, Polym. Eng. Sci., 42, 925-939 (2002). 

Fig. 11.31 Schematic representation of the Twin Screw Mixing Element Evaluator (TSMEE) in (a) the melt-melt (M-M) mode, and (b) the dissipative mix-melting (DMM) mode. The last section of both the M-M and DME modes consists of two separate HBRs. The mixing element sequences are a design variable. [Reprinted with permission from Proceedings of the Sixth Semi-annual Meeting of the Polymer Mixing Study, Polymer Processing Institute, Hoboken, NJ (1993).]...

TSMEE twin screw mixing element evaluator... 

The efficiency of compounding extruders may be enhanced in a number of ways, and twin-screw units are designed also for special purposes. Mixing elements in a variety of forms (reversed flights, kneading discs, pins, etc.) may... 

The flexible use of twin-screw extmders is facditated by the building-block design. Cylindrical, feeder, kneading and mixing elements can be combined as needed. On the whole, extmder technology can be adapted by these means to the requirements of polymer modification. 

Figure 5.3 Different types of mixing element used in co-rotating twin-screw extruders...

The number of lobes on mixers varies from one to six. Figure 3.10 shows mixing elements having one to six lobes. The co-rotating twin-screw elements could have... 

For example, the performance of several mixing elements were evaluated and compared at the Polymer Processing Institute by using the TSMEE (twin-screw mixing elements evaluator) [34]. 

Figure 7.18 depicts the particle distribution in a twin-screw element after a certain flow time, after having been initially inserted in the gap between the screws. A quantitative estimation of distributive mixing could be applied to this data. 

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