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--- en:start [2025/08/29 10:42] – [Foreword] fk
+++ en:start [2025/08/29 13:38] (aktuell) – [Foreword] admin
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 ===== Foreword =====
-The screw is the heart of both extrusion and injection molding machines. No other component in plastics processing exerts such a decisive influence on product quality and process efficiency. In recent years, it has become evident that the “universal screws” developed in the past often no longer meet today’s requirements. Insufficient melt quality, low throughput, and reduced machine efficiency are driving the plastics industry to explore new approaches. The trend is shifting toward tailored solutions that are specifically adapted to the material, the process, and the product.
+The screw is the heart of an extruder and an injection molding machine. No other component in plastics processing has such a significant influence on the quality of the end product and the cost-effectiveness of the process. In recent years, it has been recognized that the „universal screws“ developed in the past no longer meet today's requirements in many cases. Insufficient melt qualities, low melt throughputs or low machine efficiencies are forcing the plastics are forcing the plastics industry to break new ground. The trend is moving towards „individual solutions“, tailored to the material, the process and the product.
-However, the complexity of the plasticizing process, combined with the growing number of innovative screw and system designs, makes this topic increasingly challenging. Even today, decisions are often based on experience or experimental trials. As an alternative to the commonly used “trial-and-error” approach, the REX/PSI simulation package was developed. It enables the design and optimization of extruders (REX) as well as injection molding plasticizing units (PSI).
-The software runs on a standard PC and allows the simulation and evaluation of key process parameters. In addition, numerous program features support the systematic optimization of individual geometric variables as well as the design of entire machine series.
+However, the complexity of the actual plasticizing process and the growing number of innovative screw and system concepts make it difficult to deal with this topic. To this day, decisions are often made on the basis of experience and experimental investigations. The REX/PSI simulation package was developed as an alternative to the often used „trial and error“ method and presents a tool for optimization of extruders (REX) and injection moulding plasticizing units (PSI).
-Since 1989, the simulation programs have been continuously developed as part of a joint research project. By implementing more precise calculation models based on three-dimensional finite element methods and integrating current screw geometries, the software is constantly adapted to the increasing demands of users. These tools therefore make a significant contribution to the evaluation and optimization of single-screw machines in industrial applications.
-This user manual provides instructions for operating the software. The theoretical principles underlying the calculations are presented in numerous publications and dissertations. A detailed list of references is included in the appendix.
+The software, which can be run on a standard PC workstation, can be used to simulate and evaluate the process. In addition, various program features support the systematic optimization of individual geometries and the design of entire machine series.
-We would like to take this opportunity to thank all project partners who contributed to the development of this simulation software through their participation in the joint project.
-Software Engineering Team REX/PSI (Email: software@ktp.upb.de)
+The simulation programs have been continuously developed since 1989 as part of a joint research project. By deriving more precise calculation models based on the three-dimensional finite element method and by implementing current screw geometries, the software is constantly being adapted to the growing needs of users. The programs thereby make a comprehensive contribution to the assessment and optimization of single-screw machines in industrial applications.
+This user manual explains how to use the software. The theoretical approaches on which the calculations are based are presented in a large number of publications and dissertations. A list of relevant literature can be found in the appendix.
+We would like to take this opportunity to thank all project participants once again, who made the development of this simulation software possible through their participation in the joint project.
+Software Engineering Team REX/PSI (Email: software@ktp.upb.de)
+Paderborn
-Paderborn