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This book will interest researchers, scientists, engineers and graduate students in many disciplines, who make use of mathematical modeling and computer simulation. Although it represents only a small sample of the research activity on numerical simulations, the book will certainly serve as a valuable tool for researchers interested in getting involved in this multidisciplinary field. It will be useful to encourage further experimental and theoretical researches in the above mentioned areas of numerical simulation.
Many variations of injection moulding have been developed and one of the rapidly expanding fields is multi-material injection moulding. This review looks at the many techniques being used, from the terminology to case studies. The three primary types of multi-material injection moulding examined are multi-component, multi-shot and over-moulding. The basic types of multi-material injection moulding, the issues surrounding combining different types of polymers and examples of practical uses of this technology are described.
Abstract: In co-injection molding process, two different polymer melts are sequentially injected into a mold to form a part with a skin/core structure. Co-injection molding can be used among other applications for recycling, improving barrier and electrical properties. The basic characteristics of a co-injection molded product depend on the properties of the skin and core layers, and the skin/core volume ratio. This thesis presents a study of the effect of molding parameters on material distribution and mechanical properties of co-injection molded plates. The plates were molded with polypropylene(PP) and thermoplastic olefin(TPO) as skin and core. Four molding parameters-injection velocity, skin and core temperature, and core percent-were varied. Core percent was the most significant factor influencing core breakthrough. After the injection molding process reached steady state, molded samples were collected and cut to measure the core volume ratio using an optical microscope. Mechanical properties, such as flexural and impact strength show a good correlation with the core content. This thesis also compares the experimental results to numerical simulations using Moldflow Plastic Insight. Results for our simple mold show a good agreement between experimentals and simulations.
This book covers fundamental principles and numerical methods relevant to the modeling of the injection molding process. As injection molding processing is related to rheology, mechanical and chemical engineering, polymer science and computational methods, and is a rapidly growing field, the book provides a multidisciplinary and comprehensive introduction to the subjects required for an understanding of the complex process. It addresses the up-to-date status of fundamental understanding and simulation technologies, without losing sight of still useful classical approaches. The main chapters of the book are devoted to the currently active fields of flow-induced crystallization and orientation evolution of fiber suspensions, respectively, followed by detailed discussion of their effects on mechanical property, shrinkage and warpage of injection-molded products. The level of the proposed book will be suitable for interested scientists, R&D engineers, application engineers, and graduate students in engineering.
"A book about the fundamentals and applications of injection molding"--Provided by publisher -- t.p.verso.