EXTRUSION ENGINEERS

Private Communication through Mark Tribo of DuPont Co. with Chris Rauwendaal of Rauwendaal Extrusion Engineering Co. (Jun. 2001)... 

Interactive Training Extrusion, Rauwendaal Extrusion Engineering, Inc.)... 

The final chapter of the book. Chapter 12 on modeling and computer simulation was added in the fourth edition. This chapter was written by Paul Gramann, Bruce Davis, and Tim Osswald three workers who have made substantial contributions to the development of this branch of polymer processing. Computer aided engineering (CAE) is now an integral part of extrusion engineering and a current book on extrusion would not be complete without dealing with this important subject. 

The adjustable grooved feed extruder developed at Rauwendaal Extrusion Engineering [246] uses a grooved feed section in which the depth of the grooves can be continuously adjusted while the extruder is in operation. Parallel developments have taken place in Poland at the Technical University of Lublin [244, 245). Earlier concepts have been developed [247], however, due to the complexity of the adjustment mechanism, these have not been applied on a wide scale. 

Troubleshooting is often the most critical element of extrusion engineering because of the huge financial impact that extrusion problems can have. As a result, this topic may be the most important in the whole book. For that reason it was decided to devote a separate publication to this subject. The book Troubleshooting the Extrusion Process [159] is an expanded text of this chapter, with many detailed case studies. Therefore, for more details on troubleshooting the reader is referred to that book. 

Surging n Any irregularity in the output rate of an extruder. Extrusion engineers have recognized two kinds long- and short-period surging. Long-period... 

There are two basic methods of incorporating lubricants into the polymer, i.e., either by simple admixture, or by separate delivery into the extrusion engine. Below, I discuss the methods of incorporation in detail. 

Main applications Profile extrusion, engineering plastics, opaque... 

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