Melt Spinning of Continuous Filaments by Cold Air Attenuation - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Melt Spinning of Continuous Filaments by Cold Air Attenuation write by Jun Jia. This book was released on 2010. Melt Spinning of Continuous Filaments by Cold Air Attenuation available in PDF, EPUB and Kindle. Traditionally ultrafine fibers below 1 dpf are produced by extrusion followed by mechanical drawing. A modified melt spinning apparatus with high-speed air nozzle was designed and fabricated to produce continuous polypropylene filaments by cold air drawing only. With this setup, the fiber is quenched and simultaneously attenuated by a symmetric cold air jet. Since the formation of fiber structure is highly dependent on the processing conditions, the new process will provide a unique operation window to study fiber attenuation and structural formation under high-speed cold air drawing. Based on computational fluid dynamics simulation results, a parametric study was carried out under different process conditions which include processing temperature, air velocity and polymer volume flow rate. Effects of changes in processing variables on the fiber diameter, molecular orientation, crystallinity, tensile strength and other properties were studied. Furthermore, a theoretical model was developed to analyze the non-isothermal fiber attenuation mechanisms. The new knowledge obtained in this study would likely yield a new process for producing innovative fiber products.
Developing Novel Spinning Methods to Fabricate Continuous Multifunctional Fibres for Bioapplications
Developing Novel Spinning Methods to Fabricate Continuous Multifunctional Fibres for Bioapplications - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Developing Novel Spinning Methods to Fabricate Continuous Multifunctional Fibres for Bioapplications write by Azadeh Mirabedini. This book was released on 2018-07-23. Developing Novel Spinning Methods to Fabricate Continuous Multifunctional Fibres for Bioapplications available in PDF, EPUB and Kindle. This book describes the development of three dimensional electroactive fibres using a novel coaxial wet-spinning approach from organic conductors in combination with non-conducting hydrogel polymers. This book also presents the characterization and evaluation of multiaxial biofibres in terms of mechanical, physical, electrochemical and biological properties, and explores their use in a diverse range of applications including implantable electrodes, drug delivery systems and energy-storage systems. In the first chapter, the author highlights the significance of engineering three dimensional fibres, introduces the involved hydrogels and organic conductors with emphasis on their biomedical application, and collects some of the previously established methods for fabrication of biofibres. In the second chapter, particular attention is given to the overall experimental fabrication methods and characterization analyses conducted in the work. Chapters three to five present the main findings of this work, in which readers will discover how novel hybrid hydrogel fibres with an inner core of chitosan and alginate were prepared and characterized, how graphene was incorporated into coaxial wet-spun biofibres, and how one-dimensional triaxial fibres were developed using a novel coaxial wet-spinning fibre production method and applied as potential battery devices. In the final chapter of this work, the author summarizes the main achievements of the work and outlines some recommendations for future research.
Design and Applications of Nanostructured Polymer Blends and Nanocomposite Systems
Design and Applications of Nanostructured Polymer Blends and Nanocomposite Systems - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Design and Applications of Nanostructured Polymer Blends and Nanocomposite Systems write by Sabu Thomas. This book was released on 2015-09-22. Design and Applications of Nanostructured Polymer Blends and Nanocomposite Systems available in PDF, EPUB and Kindle. Design and Applications of Nanostructured Polymer Blend and Nanocomposite Systems offers readers an intelligent, thorough introduction to the design and applications of this new generation of designer polymers with customized properties. The book assembles and covers, in a unified way, the state-of-the-art developments of this less explored type of material. With a focus on nanostructured polymer blends, the book discusses the science of nanostructure formation and the potential performance benefits of nanostructured polymer blends and composites for applications across many sectors: electronics, coatings, adhesives, energy (photovoltaics), aerospace, automotive, and medical devices (biocompatible polymers). The book also describes the design, morphology, and structure of nanostructured polymer composites and blends to achieve specific properties. Covers all important information for designing and selecting the right nanostructured polymer system Provides specialized knowledge on self-repairing, nanofibre and nanostructured multiphase materials, as well as evaluation and testing of nanostructured polymer systems Serves as a reference guide for development of new products in industries ranging from electronics, coatings, and energy, to transport and medical applications Describes the design, morphology, and structure of nanostructured polymer composites and blends to achieve specific properties
Melt Spinning Continuous Filaments from High Temperature Alloys and Beryllium
Melt Spinning Continuous Filaments from High Temperature Alloys and Beryllium - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Melt Spinning Continuous Filaments from High Temperature Alloys and Beryllium write by R. Kaesjian. This book was released on 1966. Melt Spinning Continuous Filaments from High Temperature Alloys and Beryllium available in PDF, EPUB and Kindle.
A Model for Multifilament Melt-spinning Processes Incorporating Filament/quench-air Interaction and Boundary Layer Coalescence
A Model for Multifilament Melt-spinning Processes Incorporating Filament/quench-air Interaction and Boundary Layer Coalescence - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook A Model for Multifilament Melt-spinning Processes Incorporating Filament/quench-air Interaction and Boundary Layer Coalescence write by Robert Lindsey Lowe. This book was released on 2005. A Model for Multifilament Melt-spinning Processes Incorporating Filament/quench-air Interaction and Boundary Layer Coalescence available in PDF, EPUB and Kindle. Abstract: Multifilament melt spinning refers to the process in which molten polymer is extruded through a spinneret, divided into an array of individual filaments, and cooled to solidification by a fan-induced quench-air stream. The interaction of the quench-air stream with the filaments in melt-spinning processes causes the filaments to cool and the quench air to heat and slow so that each row of molten filaments in the array experiences different quench conditions. Since the properties of solidified fibers depend strongly on quench conditions, this variation results in nonuniform fiber properties from filament to filament. Quantifying and minimizing this variation is of great importance to the polymer fiber industry. A model for multifilament melt-spinning processes is developed in this paper which predicts the variation of fiber properties within the array and provides a tool for optimizing the process (e.g. minimizing fiber-to-fiber variation). The multifilament melt-spinning model developed in this paper couples a model for a single filament in a specified quench environment with filament/quench-air interaction models for three different domains, namely the stagnant boundary layer at the spinneret face, the region where the quench-air stream passes through the filament array, and the coalesced boundary layer. Material properties, process conditions, and first-row quench-air temperature and velocity profiles serve as input to the complete multifilament melt-spinning model. The model then computes the first-row filament response and the quench conditions experienced by the second row, then the second-row filament response and the quench conditions experienced by the third row, and so on.
