Download or read book A Survey of Stretching Forces of Polymeric Film During Biaxial Monoaxial and Uniaxial Stretching written by Julian Leingartner and published by . This book was released on 1994 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biaxial Stretching of Film written by Mark T. DeMeuse and published by Elsevier. This book was released on 2011-07-18 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biaxial (having two axes) stretching of film is used for a range of applications and is the primary manufacturing process by which products are produced for the food packaging industry. Biaxial stretching of film: principles and applications provides an overview of the manufacturing processes and range of applications for biaxially stretched films.Part one reviews the fundamental principles of biaxial stretching. After an introductory chapter which defines terms, chapters discuss equipment design and requirements, laboratory evaluations, biaxial film structures and typical industrial processes for the biaxial orientation of films. Additional topics include post production processing of biaxially stretched films, the stress-strain behaviour of poly(ethylene terephthalate) and academic investigations of biaxially stretched films. Part two investigates the applications of biaxial films including fresh cut produce, snack packaging and product labelling. A final chapter investigates potential future trends for biaxially oriented films and orienting lines.Biaxial stretching of film: principles and applications is a valuable reference tool for a broad spectrum of readers, ranging from polymer and fibre engineers to electrical engineers. It will also be suitable for professionals in the food packaging and paper industries. A valuable reference tool for polymer and fibre engineers, electrical engineers and professionals in the food packaging and paper industries Provides a comprehensive overview of the manufacturing processes of biaxially stretched films and includes a discussion of their future applications Places emphasis on the technology as well as the different types of polymers used
Download or read book Temporally Programmed Stretching of Polymer Films written by Sylvain Seif and published by . This book was released on 2009 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This research provides an in-depth analysis on the effects of organoclay inclusion in PLA film on the evolution of structural hierarchy during constant and variable rate uniaxial and biaxial stretching processes. At lower deformation rates and/or higher temperatures PLA exhibits three regime stress-optical behavior: In Regime I, the material remains amorphous while obeying the traditional linear Stress Optical Rule (SOR), in Regime II strain crystallization occurs in conjunction with a positive deviation from SOR, and in Regime III, birefringence increases slowly with stress as the chains reach their finite extensibilities or are locked in place by an oriented crystalline network. This is due to partial chain relaxation at these conditions which allows the highly oriented adjacent chains to register themselves into the crystal lattice formation. Lower temperature and/or higher rates, on the other hand, evoke a nematic-like phase consisting of high orientation but significant translational disorder, bringing about Regime I-III behavior with the absence of Regime II. As the organoclay filler content increases, higher temperatures and/or lower rates are required to overcome the confinement effect on the PLA chains in the vicinity of the high aspect ratio organoclay platelets and/or to relax the chains that are quickly being pulled and oriented by the clay. The 3D ordered crystal zones in filled material don't all orient in the MD, as many of the PLA chains that are entangled between and interconnected with the organoclay platelets' surfaces deform and crystallize away from the MD as the platelets separate during stretching. This phenomenon leads to lower Regime I-II slopes and end-birefringence values with an increase in clay loading. Application of very low stretch rates early on in the deformation process (Exponential (EXP) profile) was found to delay the strain crystallization mechanism which leads to rapid orientation development in the material. For the same value of strain, the highest birefringence values are evidenced in the Logarithmic (LOG) profile, whereas the lowest values are seen in the EXP profile. Furthermore, higher crystallinity values for the same strain values are obtained in the LOG profile, while lower values are obtained in the EXP profile. This implies that the chains orient and crystallize more efficiently when high rates are applied early on in the deformation process. Intermediate levels of crystallinity are induced when Linear (constant stretch rate) or Sigmoidal (high stretch rates at intermediate stages of deformation) deformation profiles are applied. Incorporation of Cloisite 30B organoclay speeds up the oriented crystallization process, bringing about significantly higher crystallinity levels at the lower deformation levels. However, as the deformation proceeds to high extension levels, higher crystallinity levels are noted in neat PLA. Films stretched using simultaneous equal biaxial (SEB) mode, in which the film is stretched under identical rates to the same stretch ratios in the MD and the TD, exhibit optically uniaxial symmetry with the two out-of-plane birefringences increasing monotonously with deformation. Furthermore, in-plane isotropy, as indicated by near zero value for in-plane birefringence [delta]n12, is evident throughout the entire deformation process in both neat and filled PLA material regardless of process conditions, as the in-plane crystal and molecular orientation is equal at all equal draw ratios. Diffraction rings of much higher intensity are noted in neat PLA, indicating higher strain crystallization levels as proven by DSC. Additionally, despite the formation of a crystalline phase, out-of-plane Regime II stress-optical behavior is not observed during SEB stretching at all conditions. Furthermore, more intense diffraction spots, as well as higher % crystallinity values, are observed during UCW stretching, as stress relaxation leading to 3D oriented and ordered chains is harder to achieve and is of lower magnitude during SEB stretching. Another part of the research involves the effects of molecular weight and rubbery state uniaxial stretching conditions on the mechano-optical behavior of Poly(m-xylylenediamine adipamide) (Nylon MXD6) films. At low stretching temperatures and high rates the stress optical behavior is found to start with an initial glassy photo-elastic behavior. Decreasing stretching rate or increasing processing temperature is found to eliminate this glassy photo-elastic regime leading to the observation of a linear initial stress optical behavior past a temperature T11 of 95%C for both M.W. materials. Following this initial regime, the behavior is controlled by the competition between orientation and relaxation during deformation. If the chain orientation relaxation is not suppressed by increasing the stretching rate and/or the molecular weight or by decreasing temperature, the material strain crystallizes. The influence of relaxation and forced retraction from different extension levels on the structure and mechano-optical behavior of Nylon MXD6 is also investigated. When relaxation takes place at the early stages of Regime I, or from the amorphous state, the stress relaxation at the processing temperature accompanies a decrease in birefringence following the linear stress-optical behavior and the material remains amorphous. In contrast, when the material is deformed and relaxed from various points along the Regime II and the Regime III, an increase in birefringence is observed during the holding stage, as a result of the local, microscopic spontaneous deformation process of the macromolecular chains under constrained engineering strain. Whereas forced retraction from within Regime I results in a gradual decrease in birefringence, retraction from within Regime III does not yield any significant changes in structure or crystallinity level even when retraction as high as 30% is applied."--Abstract.
Download or read book Extrusion written by Harold F. Giles Jr and published by William Andrew. This book was released on 2013-09-21 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of Extrusion is designed to aid operators, engineers, and managers in extrusion processing in quickly answering practical day-to-day questions. The first part of the book provides the fundamental principles, for operators and engineers, of polymeric materials extrusion processing in single and twin screw extruders. The next section covers advanced topics including troubleshooting, auxiliary equipment, and coextrusion for operators, engineers, and managers. The final part provides applications case studies in key areas for engineers such as compounding, blown film, extrusion blow molding, coating, foam, and reprocessing. This practical guide to extrusion brings together both equipment and materials processing aspects. It covers basic and advanced topics, for reference and training, in thermoplastics processing in the extruder. Detailed reference data are provided on such important operating conditions as temperatures, start-up procedures, shear rates, pressure drops, and safety. A practical guide to the selection, design and optimization of extrusion processes and equipment Designed to improve production efficiency and product quality Focuses on practical fault analysis and troubleshooting techniques
Download or read book Building Materials written by S.K. Duggal and published by Routledge. This book was released on 2017-12-04 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text on building materials includes discussion of structural clay products, rocks and stones, wood, materials for making concrete, ferrous and non-ferrous metals, and miscellaneous materials.
Download or read book Polymer Synthesis Theory and Practice written by Dietrich Braun and published by Springer Science & Business Media. This book was released on 2006-10-14 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first English edition of this book was pubUshed in 1971 with the late Prof. Dr. Werner Kern as coauthor. In 1997, for the preparation of the third edition, Prof. Dr. Helmut Ritter joined the team of authors and in 2001 Prof. Dr. Brigitte Voit and Prof. Dr. Matthias Rehahn complemented this team. The change in authors has not altered the basic concept of this 4th edition: again we were not aimed at compiling a comprehensive collection of recipes. In stead, we attempted to reach a broader description of the general methods and techniques for the synthesis, modification, and characterization of macromo- cules, supplemented by 105 selected and detailed experiments and by sufficient theoretical treatment so that no additional textbook be needed in order to under stand the experiments. In addition to the preparative aspects we have also tried to give the reader an impression of the relation of chemical structure and mor phology of polymers to their properties, as well as of areas of their application.
Download or read book Multiscale Biomechanics written by Jean-Francois Ganghoffer and published by Elsevier. This book was released on 2018-02-03 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiscale Biomechanics provides new insights on multiscale static and dynamic behavior of both soft and hard biological tissues, including bone, the intervertebral disk, biological membranes and tendons. The physiological aspects of bones and biological membranes are introduced, along with micromechanical models used to compute mechanical response. A modern account of continuum mechanics of growth and remodeling, generalized continuum models to capture internal lengths scales, and dedicated homogenization methods are provided to help the reader with the necessary theoretical foundations. Topics discussed include multiscale methods for fibrous media based on discrete homogenization, generalized continua constitutive models for bone, and a presentation of recent theoretical and numerical advances. In addition, a refresher on continuum mechanics and more advanced background related to differential geometry, configurational mechanics, mechanics of growth, thermodynamics of open systems and homogenization methods is given in separate chapters. Numerical aspects are treated in detail, and simulations are presented to illustrate models. This book is intended for graduate students and researchers in biomechanics interested in the latest research developments, as well as those who wish to gain insight into the field of biomechanics. Provides a clear exposition of multiscale methods for fibrous media based on discrete homogenization and the consideration of generalized continua constitutive models for bone Presents recent theoretical and numerical advances for bone remodeling and growth Includes the necessary theoretical background that is exposed in a clear and self-contained manner Covers continuum mechanics and more advanced background related to differential geometry, configurational mechanics, mechanics of growth, thermodynamics of open systems and homogenization methods
Download or read book Physics of Cancer written by Claudia Mierke and published by Iph001. This book was released on 2018-10-24 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: This revised second edition is improved linguistically with multiple increases of the number of figures and the inclusion of several novel chapters such as actin filaments during matrix invasion, microtubuli during migration and matrix invasion, nuclear deformability during migration and matrix invasion, and the active role of the tumor stroma in regulating cell invasion.
Download or read book Plastic Films in Food Packaging written by Sina Ebnesajjad and published by William Andrew. This book was released on 2012-12-31 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: The value of the groceries purchases in the USA is over $500 billion annually, most of which is accounted for by packaged foods. Plastic packaging of foods is not only ubiquitous in developed economies, but increasingly commonplace in the developing world, where plastic packaging is instrumental in decreasing the proportion of the food supply lost to spoilage. This new handbook is a combination of new material and updated chapters, chosen by Dr. Sina Ebnesajjad, from recently published books on this subject. Plastic Films in Food Packaging offers a practical handbook for engineers, scientists and managers working in the food packaging industry, providing a tailor-made package of science and engineering fundamentals, best practice techniques and guidance on new and emerging technologies. By covering materials, design, packaging processes, machinery and waste management together in one book, the authors enable the reader to take a lifecycle approach to food packaging. The Handbook addresses questions related to film grades, types of packages for different types of foods, packaging technologies, machinery and waste management. Additionally the book provides a review of new and emerging technologies. Two chapters cover the development of barrier films for food packaging and the regulatory and safety aspects of food packaging. Essential information and practical guidance for engineers and scientists working at all stages of the food packaging lifecycle: from design through manufacture to recycling Includes key published material on plastic films in food packaging, updated specifically for this Handbook, and new material on the regulatory framework and safety aspects Coverage of materials and applications together in one handbook enables engineers and scientists to make informed design and manufacturing decisions
Download or read book Handbook of Thermoplastic Elastomers written by Jiri George Drobny and published by Elsevier. This book was released on 2014-05-30 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Thermoplastic Elastomers, Second Edition presents a comprehensive working knowledge of thermoplastic elastomers (TPEs), providing an essential introduction for those learning the basics, but also detailed engineering data and best practice guidance for those already involved in polymerization, processing, and part manufacture. TPEs use short, cost-effective production cycles, with reduced energy consumption compared to other polymers, and are used in a range of industries including automotive, medical, construction and many more. This handbook provides all the practical information engineers need to successfully utilize this material group in their products, as well as the required knowledge to thoroughly ground themselves in the fundamental chemistry of TPEs. The data tables included in this book assist engineers and scientists in both selecting and processing the materials for a given product or application. In the second edition of this handbook, all chapters have been reviewed and updated. New polymers and applications have been added — particularly in the growing automotive and medical fields — and changes in chemistry and processing technology are covered. Provides essential knowledge of the chemistry, processing, properties, and applications for both new and established technical professionals in any industry utilizing TPEs Datasheets provide "at-a-glance" processing and technical information for a wide range of commercial TPEs and compounds, saving readers the need to contact suppliers Includes data on additional materials and applications, particularly in automotive and medical industries
Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Download or read book Printing on Polymers written by Joanna Izdebska-Podsiadły and published by William Andrew. This book was released on 2015-09-24 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: Printing on Polymers: Fundamentals and Applications is the first authoritative reference covering the most important developments in the field of printing on polymers, their composites, nanocomposites, and gels. The book examines the current state-of-the-art and new challenges in the formulation of inks, surface activation of polymer surfaces, and various methods of printing. The book equips engineers and materials scientists with the tools required to select the correct method, assess the quality of the result, reduce costs, and keep up-to-date with regulations and environmental concerns. Choosing the correct way of decorating a particular polymer is an important part of the production process. Although printing on polymeric substrates can have desired positive effects, there can be problems associated with various decorating techniques. Physical, chemical, and thermal interactions can cause problems, such as cracking, peeling, or dulling. Safety, environmental sustainability, and cost are also significant factors which need to be considered. With contributions from leading researchers from industry, academia, and private research institutions, this book serves as a one-stop reference for this field—from print ink manufacture to polymer surface modification and characterization; and from printing methods to applications and end-of-life issues. Enables engineers to select the correct decoration method for each material and application, assess print quality, and reduce costs Increases familiarity with the terminology, tests, processes, techniques, and regulations of printing on plastic, which reduces the risk of adverse reactions, such as cracking, peeling, or dulling of the print Addresses the issues of environmental impact and cost when printing on polymeric substrates Features contributions from leading researchers from industry, academia, and private research institutions
Download or read book The Science and Technology of Flexible Packaging written by Barry A. Morris and published by William Andrew. This book was released on 2022-07-23 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Science and Technology of Flexible Packaging: Multilayer Films from Resin and Process to End Use, Second Edition provides a comprehensive guide on plastic films in flexible packaging, covering scientific principles, materials properties, processes and end use considerations. Sections discuss the science of multilayer films in a concise and impactful way, presenting the fundamental understanding required to improve product design, material selection and processes. In addition, the book includes information on why one material is favored over another and how film or coating affects material properties. Descriptions and analysis of key properties of packaging films are provided from engineering and scientific perspectives. With essential scientific insights, best practice techniques, environmental sustainability information and key principles of structure design, this book provides information aids in material selection and processing, how to shorten development times and deliver stronger products, and ways to enable engineers and scientists to deliver superior products with reduced development time and cost. Provides essential information on all aspects of multilayer films in flexible packaging, including processing, properties, materials and end use Bridges the gap between scientific principles and practical challenges Includes explanations to assist practitioners in overcoming challenges Enables the reader to address new challenges, such as design for sustainability and eCommerce
Download or read book Polymer Melt Rheology written by F N Cogswell and published by Elsevier. This book was released on 1981-01-01 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the ways in which melt flow behaviour can be exploited by the plastics engineer and technician for increased efficiency of processing operation, control of end product properties and selection and development of polymers for specific purposes. (reissued with minor corrections 1994)
Download or read book Manufacturing Flexible Packaging written by Thomas Dunn and published by William Andrew. This book was released on 2014-09-04 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: Efficiently and profitably delivering quality flexible packaging to the marketplace requires designing and manufacturing products that are both "fit-to-use" and "fit-to-make". The engineering function in a flexible packaging enterprise must attend to these dual design challenges. Flexible Packaging discusses the basic processes used to manufacture flexible packaging products, including rotogravure printing, flexographic printing, adhesive lamination, extrusion lamination/coating; and finishing/slitting. These processes are then related to the machines used to practice them, emphasising the basics of machines’ control systems , and options to minimize wasted time and materials between production jobs. Raw materials are also considered, including the three basic forms: Rollstock (paper, foil, plastic films); Resin; and Wets (inks, varnishes, primers). Guidance is provided on both material selection, and on adding value through enhancement or modification of the materials’ physical features. A ‘measures’ section covers both primary material features – such as tensile, elongation, modulus and elastic and plastic regions – and secondary quality characteristics such as seal and bond strengths, coefficient of friction, oxygen barrier and moisture vapour barrier. Helps engineers improve existing raw material selection and manufacturing processes for manufacturing functional flexible packaging materials. Covers all aspects of delivering high value packaging to the customer – from the raw materials, to the methods of processing them, the machines used to do it, and the measures required to gauge the characteristics of the product. Helps engineers to minimize waste and unproductive time in production.
Download or read book Natural Fibres Advances in Science and Technology Towards Industrial Applications written by Raul Fangueiro and published by Springer. This book was released on 2016-02-10 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book collects selected high quality articles submitted to the 2nd International Conference on Natural Fibers (ICNF2015). A wide range of topics is covered related to various aspects of natural fibres such as agriculture, extraction and processing, surface modification and functionalization, advanced structures, nano fibres, composites and nanocomposites, design and product development, applications, market potential, and environmental impact. Divided into separate sections on these various topics, the book presents the latest high quality research work addressing different approaches and techniques to improve processing, performance, functionalities and cost-effectiveness of natural fibre and natural based products, in order to promote their applications in various advanced technical sectors. This book is a useful source of information for materials scientists, teachers and students from various disciplines as well as for R& D staff in industries using natural fibre based materials.
Download or read book Nano size Polymers written by Stoyko Fakirov and published by Springer. This book was released on 2016-09-01 with total page 399 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details all current techniques for converting bulk polymers into nano-size materials. The authors highlight various physical and chemical approaches for preparation of nano-size polymers. They describe the properties of these materials and their extensive potential commercial applications.