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Preface
<p style=„text-align: justify;“>Central part of the extruder or the injection molding machine is the screw. No other construction unit in the plasticization process has a similar significant influence in the quality of the final product and the economy of the process. During the last years one has found out that the developed “universal screws” do not meet today’s requirements. Insufficient melting qualities, low melt throughput or low machine efficiency force the plastic industry to break new ground. Trend is towards “lean solutions”, which are customised to the material, the process and the product.</p> <p style=„text-align: justify;“> </p> <p style=„text-align: justify;“>The complexity of the plasticization itself and the increasing number of innovative screw and plant concepts complicates handling of the subject. To date, decisions have primarily been made on the basis of “empirical values” and experimental investigations. The REX/PSI simulation program has been developed by way of an alternative to the frequently employed trail-and-error-approach. This can be used in the layout and optimization of extruders (REX) respectively injection plasticising units (PSI).</p> <p style=„text-align: justify;“> </p> <p style=„text-align: justify;“>By use of the software, applicable on each usual PC-desktop, significant parameters for the assessment of the process can be simulated. Additionally, different program features support the systematical optimization of single geometrical parameter and the layout of complete machine lines.</p> <p style=„text-align: justify;“> </p> <p style=„text-align: justify;“>In the framework of a community research project the simulation programs have been continuously advanced since 1989. By derivation of more precise calculation models and by implementation of current screw geometries the software is continuously adopted to the growing needs of the user. Due to this the programs provide for a comprehensive contribution to the assessment and optimization of single screw machines in the industrial operation.</p> <p style=„text-align: justify;“> </p> <p style=„text-align: justify;“>In the present manual the application of the software is explained. The theoretical approaches which are the basis for the calculations are introduced by a number of different publications and dissertations. A detailed list of literature can be found in the appendix.</p> <p style=„text-align: justify;“> </p> <p style=„text-align: justify;“> </p> <p style=„text-align: justify;“>Here again, we like to thank all the participants in the community project who even by their engagement  enabled the creation of this simulation software.  </p> <p> </p> <p style=„text-align: right;“> </p> <p style=„text-align: right;“>Software Engineering Team REX/PSI (Email: software@ktp.upb.de)</p> <p style=„text-align: right;“>Paderborn</p>