Download or read book Microcellular Injection Molding of Polypropylenes Containing Nucleating Agents written by Kristin L. Martinez and published by . This book was released on 2008 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Effects of Injection Molding and Storage Conditions on Polypropylene Copolymer written by Zehra S. Kalkan-Sevinc and published by . This book was released on 2018 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work focused on studying the effects of injection molding parameters (cooling time and melt temperature) and storage conditions (annealing versus cooling) on the thermal, mechanical, and optical properties of an ethylene-propylene copolymer made with and without nucleating agents. Preform properties (optical, crystallinity) affect the consistency of the preforms' reheating via infrared lamps before stretch blow molding. The analysis of detailed preform properties as a result of both injection molding processing and postmolding treatment or preform storage conditions was lacking to correlate with the blow molding performance. This study confirmed that postmolding aging is a significant factor that affects material properties and therefore suggested subsequent blow molding. It also suggested that shorter injection molding cooling time helps to minimize the effects of aging and storage conditions. As expected, with the inclusion of the nucleating agent, clarity, yield strength, and density of the material improved.
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 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
Download or read book Handbook of Nucleating Agents written by George Wypych and published by Elsevier. This book was released on 2021-01-25 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Nucleating Agents, Second Edition gives engineers and materials scientists the information they need to increase the production rate, modify structure and morphology, improve mechanical performance, and reduce the haze of polymeric products through proper selection of nucleating agents (and/or the so-called clarifying agents). The book analyzes the existing literature paying special attention to recent developments, and is divided into 14 chapters, each of which concentrates on essential performances of nucleating agents. Chemical origin and related properties of nucleating agents are analyzed in general terms to highlight the differences in their properties and the book also provides the most essential theoretical knowledge required for proper selection and use of nucleating and clarifying agents. This includes polymer crystallization with and without nucleating agents, parameters of crystallization, essential influences on the nucleation processes, the measures of nucleation efficiency, the mechanisms of nucleation, and the effective methods of dispersion of nucleating agents. Later chapters concentrate on the application aspects in different formulations, outlining nineteen polymer processing methods which require use of nucleating agents, forty different polymers which are known to use nucleating agents, and sixteen applied examples of commercial products with nucleating agents. The final three chapters discuss the effects of nucleating agents on physical and mechanical properties of materials, the most essential analytical techniques, and health and safety in use of nucleating agents. Enables engineers to use nucleating agents more effectively to increase production rate, modify structure and morphology, and reduce haze of polymer products Provides a theoretical grounding required for proper selection and use of nucleating and clarifying agents Offers an extensive review of current applications of nucleating agents in different formulations Includes analysis of the chemical origin and related properties of nucleating agents to highlight differences in their properties
Download or read book Nucleating Agents written by Stuart Fairgrieve and published by iSmithers Rapra Publishing. This book was released on 2007-11 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: A very important factor in obtaining optimised physical properties from a semi-crystalline polymer is the size of the crystalline structures present in the material, and this crucially depends on the initiation process of crystallisation of the polymer from the melt - nucleation. This review provides information on the development of materials and methods for influencing the nucleation of polymer crystallisation in commercial processing by means of addition of low levels of adjuvants specifically selected for this purpose.
Download or read book Effect of Cooling Rate and Mold Counter Pressure on the Crystallinity and Foaming Control in Microcellular Injection Molded Polypropylene Parts written by Jeffrey Scott Cousineau and published by . This book was released on 2012 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microcellular polymer injection molding is a growing industry technique due to its ability to produce dimensionally stable stress free parts while reducing cycle time, material usage, and energy costs. The process was invented by Dr. Nam P. Suh at the Massachusetts Institute of Technology in the early 1980's. The basic idea is to dissolve a supercritical fluid into the polymer melt which will nucleate and expand within the part core after injection during the cooling stage. Microcellular polymer injection molding is becoming increasingly popular in automotive, semiconductor, and industrial applications. While the technique has been widely successful using amorphous polymers, semi-crystalline polymers present new challenges not encountered during processing with their amorphous counterparts. The polymer chains in a semi-crystalline material develop an organized crystal structure during the cooling stage. Crystal development generates two main issues for microcellular processing. The first being that the excess heat released during the crystal formation affects the expansion of the microcellular bubble causing unpredictable non-uniform growth. The second is that the growth of the crystal structure within the polymer melt expels and displaces the supercritical fluid forcing the foaming to occur out at the edges of the part rather than uniformly through its core. This paper develops and explores strategies to control and overcome these problems. The first strategy is to effectively control the cooling rate. It is well know and has been proven, that increasing the cooling rate during the crystallization process can decrease crystallinity effectively freezing the polymer microstructure in place before the polymer chains can become completely organized. The second strategy is to utilize in mold counter pressure to observe its effect of the development of the foaming and crystallization. In mold counter pressure has been found to be an effective means of controlling bubble size and distribution during amorphous microcellular injection molding therefore it has merit for being an effective method to control foaming with semi-crystalline polymers. These two strategies have been implemented on a set of experiments and the results measured and observed by differential scanning calorimetry and scanning electron microscopy. The results of the experiment indicate the strategies implied are effective methods for improving part quality and also impose confidence in further development.
Download or read book Foaming with Supercritical Fluids written by Ernesto Di Maio and published by Elsevier. This book was released on 2021-11-06 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foaming with Supercritical Fluids, Volume Nine provides a comprehensive description of the use of supercritical fluids as blowing agents in polymer foaming. To this aim, the fundamental issues on which the proper design and control of this process are rooted are discussed in detail, with specific attention devoted to the theoretical and experimental aspects of sorption thermodynamics of a blowing agent within a polymer, the effect of the absorbed blowing agent on the thermal, interfacial and rheological properties of the expanding matter, and the phase separation of the gaseous phase, and of the related bubble nucleation and growth phenomena. Several foaming technologies based on the use of supercritical blowing agents are then described, addressing the main issues in the light of the underlying chemical-physical phenomena. Offers strong fundamentals on polymer properties important on foaming Outlines the use of supercritical fluids for foaming Covers theoretical points-of-view, including foam formation of the polymer/gas solution to the setting of the final foam Discusses the several processing technologies and applications
Download or read book Rubber Toughened Engineering Plastics written by A.A. Collyer and published by Springer Science & Business Media. This book was released on 1994-05-31 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rubber Toughened Engineering Plastics covers the main physical principles involved in optimum toughening in high temperature engineering plastics and speciality plastics and describes the synthetic strategies used to obtain satisfactorily toughened grades in these materials by control of microstructure. This book will act as a focus for current thought on the principles of rubber toughening and the methods employed for the rubber toughening of major engineering and speciality plastics.
Download or read book Polymeric Foams written by José Ignacio Velasco and published by MDPI. This book was released on 2019-11-18 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in nanotechnology have boosted the development of more efficient materials, with emerging sectors (electronics, energy, aerospace, etc.) demanding novel materials to fulfill the complex technical requirements of their products. This is the case of polymeric foams, which may display good structural properties alongside functional characteristics through a complex composition and (micro)structure in which a gas phase is combined with rigid ones, mainly based on nanoparticles, dispersed throughout the polymer matrix. In recent years, there has been an important impulse in the development of nanocomposite foams, extending the concept of nanocomposites to the field of cellular materials. This, alongside developments in new advanced foaming technologies which have allowed the generation of foams with micro, sub-micro, and even nanocellular structures, has extended the applications of more traditional foams in terms of weight reduction, damping, and thermal and/or acoustic insulation to novel possibilities, such as electromagnetic interference (EMI) shielding. This Special Issue, which consists of a total of 22 articles, including one review article written by research groups of experts in the field, considers recent research on novel polymer-based foams in all their aspects: design, composition, processing and fabrication, microstructure, characterization and analysis, applications and service behavior, recycling and reuse, etc.
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 630 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 Microcellular Processing written by Kelvin T. Okamoto and published by . This book was released on 2003 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: A growing number of plastics processors gain a competitive edge by utilizing the commercial microcellular process using existing injection molding or extrusion equipment at commercial production rates with low-cost modifications. End users also gain an advantage when the microcellular process is incorporated into product design and cost. In order to facilitate the transition and to help processors and end users make the most of this cutting edge commercial technology, this book provides a comprehensive description of all crucial elements. Endorsed by Trexel Inc., this volume provides the much-needed information for anyone considering or already implementing this promising new technology.
Download or read book Natural and Wood Fibre Reinforcement in Polymers written by A. K. Bledzki and published by iSmithers Rapra Publishing. This book was released on 2002 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report examines the different fibre types available and the current research. The authors have cited several hundred references to the latest work on properties, processing and applications. The different methods of fibre pretreatment are examined, together with fibre properties, chemistry and applications. This review is accompanied by summaries of papers from the Rapra Polymer Library database.
Download or read book Micro Injection Molding written by Guido Tosello and published by Carl Hanser Verlag GmbH Co KG. This book was released on 2018-08-06 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Micro Injection Molding" meets the need for a dedicated book dealing exclusively with micro injection molding and overcoming the challenges of managing and processing polymer materials at ultra-small scales. Micro injection molding is the primary process for the mass production of polymer components with critical dimensions in the sub-millimeter range; however, it is not just a simple downscaling of conventional injection molding, and specific material-process-product interactions must be understood in order to achieve near zero-defect net-shape micro molded products. Micro molding is typically associated with ultra-high accuracy and superior process capabilities. Micro molded products have dimensional tolerances down to the single-digit micrometer range and surface finish with roughness from the sub-micrometer down to a few nanometers range. Micro and nano-structured tool surfaces are reproduced with very high replication fidelity onto the polymer products. Micro injection molding is highly suitable for the manufacture of multifunctional micro components such as micro implants, microfluidic systems, polymer micro optical elements, and micro mechanical systems. This book provides engineers, project managers, researchers, consultants, and other professionals involved in precision polymer processing and micro manufacturing with a comprehensive, up-to-date, and detailed treatment of the main topics related to micro molding, from material and process technology to tooling, to key-enabling technologies, and multimaterial process variations. Contents: • Part 1 – Polymer Materials and Process Micro Technology: micro injection molding machines technology; micro molding process monitoring and control; polymer materials structure and properties in micro injection molding parts; surface replication in micro injection molding • Part 2 – Tooling Technologies for Micro Mold Making: micro machining technologies for micro injection mold making; ultra-precision machining technologies for micro injection mold making; surface treatment of mold tools in micro injection molding • Part 3 – Micro Molding Key-Enabling Technologies: vacuum-assisted micro injection molding; modeling and simulation of micro injection molding; metrological quality assurance in micro injection molding; additive manufacturing for micro tooling and micro part rapid prototyping • Part 4 – Multimaterial Micro Processing: micro powder injection molding; multimaterial micro injection molding
Download or read book Polymeric Foams written by Shau-Tarng Lee and published by CRC Press. This book was released on 2006-08-21 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers are among the major hallmarks of 20th-century science, and the explosive outgrowth and tremendous importance of polymeric foams is a testament to their amazing versatility and unique properties. With applications from automotive to acoustic and medical, polymeric foams pervade all areas of our lives. If this growth is to continue into the
Download or read book Developments in Microcellular Injection Molding Technology written by Hrishikesh Ashokrao Kharbas and published by . This book was released on 2003 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
