The widespread use of large scale units for manufacturing blown film, blow-molded articles, flat film, and extruded pipes necessitates troubleshooting on site. This book provides practical computational tools which can be applied easily on the shop floor to obtain quick solutions in these and many other areas of polymer extrusion.
Hands-on Examples and Case Studies
The plastics engineer working on the shop floor in a plastics manufacturing plant often needs quick answers to questions such as why the extruder output is low or whether he can expect better quality product by changing the resin or if the die pressure can be lowered. Applying state-of-the art numerical software to address these issues is time-consuming and costly. Starting from practical design formulas which are easily applicable, and yet take the resin rheology into account, this guide provides answers to these questions quickly and effectively by guiding the user step by step through the computational procedures on the basis of illustrative technical examples. Problems related to melt fracture, homogeneity of the melt, effect of screw geometry on the quality of the melt and the effect of die pressure on the pellet surface and their troubleshooting are only few of the topics among many that are dealt with in detail. All the calculations involved can be handled by pocket calculators and hence can be performed right on the site where the machines are running. This guide is a valuable tool not only to troubleshoot but also to estimate the effect of design and process parameters on the product quality in plastics processing.
Whether working on product design or process optimization, engineers need a multitude of polymer property values. This book provides a quick reference on basic design data for resins, machines, parts, and processes, and shows how to apply these data to solve practical problems. Numerous examples are given to illustrate the appropriate applications of the data presented. Readers can carry out calculations using a handheld calculator.
Contents: Formulas of Rheology. Newtonian Fluids. Viscous Shear Flow of Polymer Melts. Viscoelastic Behavior of Polymers. Thermodynamic Properties. Formulas for Heat Transfer: Steady-state and Unsteady-state Conduction. Heat Conduction with Dissipation. Dimensionless Groups. Heat Transfer by Convection and Radiation. Dielectric Heating. Fick’s Law of Diffusion. Designing Plastics Parts. Formulas for Designing Extrusion and Injection Molding Equipment: Extrusion Dies, Screws, and Injection Molding.
Dieses hervorragende Buch enthält eine wohl einmalige Sammlung von praktikablen und bewährten Formeln, die es ermöglichen, ver-ar-bei-tungs-technische Vorgänge praxisnah zu berechnen. Aus den Gebieten Rheologie, Thermodynamik, Wärmeübertragung und Bauteilauslegung sind die für den Praktiker wichtigen Formeln dargestellt und mit zahlreichen Beispielen erläutert. Das Buch bietet auch einen Überblick über die Berechnungsmethoden, die in den Bereichen Extrusion und Spritzgießen zur Auslegung von Maschinen und Werk-zeugen nötig sind. 3 Auch als englische --Ausgabe lieferbar.
