Design Formulas for Plastics Engineers

Kunststoff;

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Designing machines and dies is done today to a large extent with the help of computer programs. However, the predictions of these programs do not always agree with the practical results, so that there is a need to improve the underlying mathematical models. Therefore a knowledge of the formulas on which the models are based, and the limits of their applicability, is necessary if one wants to develop a new program or improve one already in use. The plastics engineer has often to deal with different fields of engineering. The search for the appropriate equations in the various fields concerned can be time-consuming. A collection of formulas from the relevant fields, as given in this book, makes it easier to write one's own program or to make changes in an existing program, in order to obtain a better fit with the experiments. The formulas are classified according to the fields, rheology, thermodynamics, heat transfer and part design. Each chapter covers the relevant relations in that particular field. A separate chapter is devoted to treat the practical equations for designing extrusion and injection molding equipment. Numerous worked-out problems in metric units illustrate the use of the formulas.