Download or read book Physical Foam Injection Molding written by Hartmut Traut and published by Carl Hanser Verlag GmbH Co KG. This book was released on 2024-05-06 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than half of all injection molded plastic parts can be produced more cost-effectively and with better tolerances using foam injection molding compared to traditional compact injection molding. For the part designer, the focus is on the functionality of the molded part, not on the plastic-compatible design, which is precisely what compact injection molding requires. This book describes the necessary fundamentals of physical foam injection molding, clearly illustrated by means of detailed, industrially proven examples to show the technology’s potential. Machine and mold technology are also explained in detail, and polymers suitable for the process are discussed. The focus is always on the question of whether the potential of physical foam injection molding has already been exhausted or whether it is emerging as a second standard process alongside compact injection molding. The experienced authors make it possible to look beyond the end of one’s nose. The reader can see which plastic parts can be converted from compact to foam injection molding, and is encouraged to rethink the part design. With this book, specialists are able to examine an application for their own company and analyze it with regard to its economic implementation. However, the book also shows the clear limitations of this technology. Content: Foam Injection Molding and its Different Process Variants Definition and Characteristics of Physical Foam Injection Molding Design Guidelines for Foamed Components Polymers for Foam Injection Molding Process Simulation Mechanical Fundamentals of the Foam Injection Molding System Mold Technology Application Examples: Automotive/Household/Packaging/Medical

Download or read book Some Critical Issues for Injection Molding written by Jian Wang and published by BoD – Books on Demand. This book was released on 2012-03-23 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is composed of different chapters which are related to the subject of injection molding and written by leading international academic experts in the field. It contains introduction on polymer PVT measurements and two main application areas of polymer PVT data in injection molding, optimization for injection molding process, Powder Injection Molding which comprises Ceramic Injection Molding and Metal Injection Molding, ans some special techniques or applications in injection molding. It provides some clear presentation of injection molding process and equipment to direct people in plastics manufacturing to solve problems and avoid costly errors. With useful, fundamental information for knowing and optimizing the injection molding operation, the readers could gain some working knowledge of the injection molding.

Download or read book Microcellular Foam Injection Molding of Thermoplastics Using Green Physical Blowing Agent written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Blowing Agents and Foaming Processes written by and published by iSmithers Rapra Publishing. This book was released on 2004 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Novel Injection Molding Foaming Approaches Using Gas laden Pellets written by and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel method of producing injection molded parts with a foamed micro structure has been developed. It has been named supercritical fluid-laden pellet injection molding foaming technology (SIFT). Compared with conventional microcellular injection molding (MIM) tech-nologies, SIFT lowers the equipment costs significantly without sacrificing the production rate, making it a very promising candidate for mass producing foamed injection molded parts. In this study, both nitrogen (N2) and carbon dioxide (CO2) were verified by experiments to be suitable for this process as physical blowing agents. A novel foam injection molding approach using CO2+N2 co-blowing agents was proposed in this study. It has been discovered that when CO2 and N2 were introduced together as co-blowing agents at appropriate ratios, foamed parts with much finer morphology can be produced using this approach compared with using either blowing agent alone. It was first realized by combining the SIFT gas-laden pellets with the microcellular injection molding (MIM), such that N2 and CO2 can be introduced to the foaming process independently in two steps with precise dosage control. This approach has been implemented on several types of commodity polymers with equal success including low density polyethylene (LDPE), poly¬propylene (PP), high impact polystyrene (HIPS), and thermoplastic polyurethane (TPU) with two distinct mold geometries, and all lead to extraordinarily fine cell structures and/or high foam expansion ratio. To enhance the performance of the SIFT technology for future stringent industrial applications, several improvements were made. Methods to further enhance the cell nucleation rate were investigated. For the purpose of prolonging the gas-laden pellets shelf life, low molecular weight (LMW) additives were compounded with the polymer matrix. The experimental results indicate that LMW additives can effectively reduce the gas desorption rate from the pellets and lead to a longer shelf. It was found that at certain blend compositions, the ductility of the molded samples can be dramatically improved while achieving significant weight reduction. This novel ductility enhancing mechanism was investigated in this study. The analysis indicates that to achieve improved ductility, it is important to create a microcellular structure with a sub-micron scale immiscible secondary phase.

Download or read book Investigation of Foaming Behaviors in Injection Molding Using Mold Pressure Profile written by John Won S. Lee and published by . This book was released on 2009 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is intended to improve the understanding of foaming behaviors in various foam injection molding processes: structural foam molding, gas counter pressure molding, and gas counter pressure with mold opening. The foaming behavior in foam injection molding is different from foam extrusion in two ways. First, foaming occurs in a confined volume, which consists of a mold, whereas, it occurs in an open environment in foam extrusion. And second, while the foaming behavior in foam extrusion does not change with time once the steady state is reached, foam injection molding is on the other hand, time-dependent. These differences made it very challenging to study the foaming behaviors in foam injection molding. In this thesis, experiments were first conducted in foam extrusion to understand the effects of processing and material parameters on cell nucleation and growth behaviors. Subsequently, the knowledge obtained from the foam extrusion experiments was transferred to the foam injection molding process and the fundamental foaming mechanisms in foam injection molding were developed by conducting extensive experiments. Four processing parameters were mainly studied in this thesis: injection speed, void fraction setting (i.e., shot size), nitrogen content, and gate resistance. The experimental results revealed that the mold pressure profile during the foam injection molding process governed its foaming behaviors. Furthermore, by analyzing the mold pressure profile during the structural foam molding, it was possible to predict the achievable cell density in structural foam molding based on the foam extrusion results. When the gas counter pressure was employed, the analysis of the foaming behavior was relatively easier since the cell nucleation did not occur during the injection stage. However, the cell density that was achieved by using the gas counter pressure was generally lower than that obtained in structural foam molding due to the lower pressure drop rate caused by the use of the gas counter pressure. It was also discovered that the use of mold opening in combination with the gas counter pressure was very effective when uniform cell structure with a high void fraction was desired in addition to class-A surface quality.

Download or read book Polymeric Foams written by S.-T. Lee and published by CRC Press. This book was released on 2022-05-19 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymeric Foams: Innovations in Technologies and Environmentally Friendly Materials offers the latest in technology and environmental innovations within the field of polymeric foams. It outlines how application-focused research in polymeric foam can continue to improve living quality and enhance social responsibility. This book: Addresses technological innovations including those in bead foams, foam injection molding, foams in tissue engineering, foams in insulation, and silicon rubber foam Discusses environmentally friendly innovations in PET foam, degradable and renewable foam, and physical blowing agents Describes principles as well as applications from internationally recognized foam experts This work is aimed at researchers and industry professionals across chemical, mechanical, materials, polymer engineering, and anyone else developing and applying these advanced polymeric materials.

Download or read book Specialized Injection Molding Techniques written by Hans-Peter Heim and published by William Andrew. This book was released on 2015-11-02 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special Injection Molding Techniques covers several techniques used to create multicomponent products, hollow areas, and hard-soft combinations that cannot be produced with standard injection molding processes. It also includes information on the processing techniques of special materials, including foaming agents, bio-based materials, and thermosets. The book describes the most industrially relevant special injection molding techniques, with a detailed focus on understanding the basics of each technique and its main mechanisms, i.e., temperature, mold filling, bonding, residual stresses, and material behavior, also providing an explanation of process routes and their variants, and discussions of the most influencing process parameters. As special molding technologies have the potential to transform plastics processing to a highly-efficient, integrated type of manufacturing, this book provides a timely survey of these technologies, putting them into context, accentuating new opportunities, and giving relevant information on processing. Provides information about the basics needed for understanding several special injection molding techniques, including flow phenomena, bonding mechanisms, and thermal behavior Covers the basics of each technique and its main mechanisms, i.e., temperature, mold filling, bonding, residual stresses, and material behavior Discusses the most relevant processing parameters for each injection molding technique Presents a variety of techniques, including gas and water assisted injection molding, multi component injection molding, hybrid injection molding, injection molding of bio-based materials, and techniques for thermoset

Download or read book Polymeric Foams written by Shau-Tarng Lee and published by CRC Press. This book was released on 2008-12-24 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores the Latest Developments in Polymeric FoamsSince the 1960s polymeric foams have grown into a solid industry that affects almost every aspect of modern life. The industry has weathered the energy crisis in the 70s, ozone issues in the 80s, and recycle/reuse in the 90s. However, the pace of development and social climate is rapidly changing a

Download or read book Advances in Polymer Processing 2020 written by Christian Hopmann and published by Springer Nature. This book was released on 2020-03-10 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the proceedings of the International Symposium on Plastics Technology, which was held on March 10, 2020 in Aachen, Germany, and was organised by the Institute for Plastics Processing (IKV) in Industry and Craft at RWTH Aachen University. Peer-reviewed by an international scientific committee, the conference proceedings comprise the papers presented by the international speakers. Topics covered include - circular economy- extrusion- lightweight technologies- simulation and digitisation - injection moulding- hybrid materials and additive manufacturing. In these fields, key themes for plastics technologies have been identified that will shape the face of research and industry for the next decade. In their contributions, the authors present the latest scientific findings, and discuss topical issues in plastics technologies. The symposium offered an inspiring forum for the exchange on research and innovation, for discussing urgent questions and providing impulses for the future of plastics technology.

Download or read book Polymer Processing written by Donald G. Baird and published by John Wiley & Sons. This book was released on 2014-03-24 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental concepts coupled with practical, step-by-step guidance With its emphasis on core principles, this text equips readers with the skills and knowledge to design the many processes needed to safely and successfully manufacture thermoplastic parts. The first half of the text sets forth the general theory and concepts underlying polymer processing, such as the viscoelastic response of polymeric fluids and diffusion and mass transfer. Next, the text explores specific practical aspects of polymer processing, including mixing, extrusion dies, and post-die processing. By addressing a broad range of design issues and methods, the authors demonstrate how to solve most common processing problems. This Second Edition of the highly acclaimed Polymer Processing has been thoroughly updated to reflect current polymer processing issues and practices. New areas of coverage include: Micro-injection molding to produce objects weighing a fraction of a gram, such as miniature gears and biomedical devices New chapter dedicated to the recycling of thermoplastics and the processing of renewable polymers Life-cycle assessment, a systematic method for determining whether recycling is appropriate and which form of recycling is optimal Rheology of polymers containing fibers Chapters feature problem sets, enabling readers to assess and reinforce their knowledge as they progress through the text. There are also special design problems throughout the text that reflect real-world polymer processing issues. A companion website features numerical subroutines as well as guidance for using MATLAB®, IMSL®, and Excel to solve the sample problems from the text. By providing both underlying theory and practical step-by-step guidance, Polymer Processing is recommended for students in chemical, mechanical, materials, and polymer engineering.

Download or read book Microcellular Injection Molding written by Jingyi Xu and published by John Wiley & Sons. This book was released on 2011-01-06 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the most important aspects of microcellular injection molding with applications for science and industry. The book includes: experimental rheology and pressure-volume-temperature (PVT) data for different gas materials at real injection molding conditions, new mathematical models, micrographs of rheological and thermodynamic phenomena, and the morphologies of microcellular foam made by injection molding. Further, the author proposes two stages of processing for microcellular injection molding, along with a methodology of systematic analysis for process optimization. This gives critical guidelines for quality and quantity analyses for processing and equipment design.

Download or read book Blowing Agents and Foaming Processes 2005 written by and published by iSmithers Rapra Publishing. This book was released on 2005 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 7th international conference was dedicated to blowing agents and process technology for foamed plastics and rubber. These proceedings provide excellent coverage of the key topics of interest to the industry. There are a good variety of papers on innovations in foaming technology and new applications of blowing agents, with sessions on foaming polyurethane and thermoplastics. There is also a very interesting overview paper on environmental issues and new legislation affecting the industry, particularly in construction applications.

Download or read book Injection Molding written by Musa Rasim Kamal and published by Hanser Publications. This book was released on 2009 with total page 1026 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A book about the fundamentals and applications of injection molding"--Provided by publisher -- t.p.verso.

Download or read book Handbook of Plastic Processes written by Charles A. Harper and published by John Wiley & Sons. This book was released on 2006-05-26 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt: An outstanding and thorough presentation of the complete field of plastics processing Handbook of Plastic Processes is the only comprehensive reference covering not just one, but all major processes used to produce plastic products-helping designers and manufacturers in selecting the best process for a given product while enabling users to better understand the performance characteristics of each process. The authors, all experts in their fields, explain in clear, concise, and practical terms the advantages, uses, and limitations of each process, as well as the most modern and up-to-date technologies available in their application. Coverage includes chapters on: Injection molding Compression and transfer molding Sheet extrusion Blow molding Calendering Foam processing Reinforced plastics processing Liquid resin processing Rotational molding Thermoforming Reaction injection molding Compounding, mixing, and blending Machining and mechanical fabrication Assembly, finishing, and decorating Each chapter details a particular process, its variations, the equipment used, the range of materials utilized in the process, and its advantages and limitations. Because of its increasing impact on the industry, the editor has also added a chapter on nanotechnology in plastics processing.

Download or read book Injection Molding Handbook written by D.V. Rosato and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1484 pages. Available in PDF, EPUB and Kindle. Book excerpt: This third edition has been written to thoroughly update the coverage of injection molding in the World of Plastics. There have been changes, including extensive additions, to over 50% of the content of the second edition. Many examples are provided of processing different plastics and relating the results to critiCal factors, which range from product design to meeting performance requirements to reducing costs to zero-defect targets. Changes have not been made that concern what is basic to injection molding. However, more basic information has been added concerning present and future developments, resulting in the book being more useful for a long time to come. Detailed explanations and interpretation of individual subjects (more than 1500) are provided, using a total of 914 figures and 209 tables. Throughout the book there is extensive information on problems and solutions as well as extensive cross referencing on its many different subjects. This book represents the ENCYCLOPEDIA on IM, as is evident from its extensive and detailed text that follows from its lengthy Table of CONTENTS and INDEX with over 5200 entries. The worldwide industry encompasses many hundreds of useful plastic-related computer programs. This book lists these programs (ranging from operational training to product design to molding to marketing) and explains them briefly, but no program or series of programs can provide the details obtained and the extent of information contained in this single sourcebook.

Download or read book Handbook of Foaming and Blowing Agents written by George Wypych and published by Elsevier. This book was released on 2022-03-12 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Foaming and Blowing Agents, Second Edition includes the most current information on foaming technology, guiding users on the proper selection of formulation, which is highly dependent on the mechanisms of action of blowing agents and foaming agents, as well as dispersion and solubility. The book includes properties of 23 groups of blowing agents and the typical range of technical performance for each group, including general properties, physical-chemical properties, health and safety, environmental impact, and applications in different products and polymers. All information is illustrated by chemical reactions and diagrams. Chapters in the book look at foaming mechanisms with the use of solid blowing agents, which are decomposed to the gaseous products by application of heat, production of gaseous products by chemical reaction, and foaming by gases and evaporating liquids. Introduces the fundamental mechanisms of action of blowing agents and foaming Includes best practice guidance to help engineers and technicians improve the efficiency of their existing foaming processes Enables practitioners to select blowing agents and foaming methods more effectively, thus reducing the risk of poor specification Introduces useful analytical techniques for foaming Discusses the environmental impact of foaming processes