Download or read book Process for Continuous Foam Extrusion of Thermoplastic Polymers Via Syntactic and Chemical Foaming Agents written by and published by . This book was released on 2003 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A process for producing an electrical insulative material. First there is produced a composition including a thermoplastic polymer resin selected from the group consisting of a polyethylene octene, a polyethylene hexene, a polyethylene heptene, a polyethylene nonene and a polyethylene decene; a filler selected from the group consisting of expandable polymer microballoons and glass microspheres; and a blowing agent comprising a physical blowing% agent and% a chemical blowing agent. The chemical-blowing agent is selected from one or more of the group consisting of an exothermic blowing agent and an endothermic blowing agent. This composition is then continuously foam extruded.
Download or read book Foam Extrusion written by S.-T. Lee and published by CRC Press. This book was released on 2014-04-07 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combining the science of foam with the engineering of extrusion processes, Foam Extrusion: Principles and Practice delivers a detailed discussion of the theory, design, processing, and application of degradable foam extraction. In one comprehensive volume, the editors present the collective expertise of leading academic, research, and industry spec
Download or read book Thermoplastic Foam Processing written by Richard Gendron and published by CRC Press. This book was released on 2004-10-28 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: As researchers seek replacements for banned, ozone-depleting foaming agents, the authors of Thermoplastic Foam Processing: Principles and Development strive to develop a better understanding of foaming processes and find solutions for day-to-day practice. This book presents the latest research in foam extrusion and physical foaming agents with a st
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 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 Extrusion Processing of Low bulk Density Microcellular Open cell Thermoplastic Foams written by Chang-Dong Patrick Lee and published by . This book was released on 2006 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to promote a deeper understanding of the cell opening behavior during foaming, a failure analysis of a cell wall was performed according to the Considere and Failure criteria using the uniaxial experimental data of a polymer melt. A theoretical approach to prediction of the cell wall rupture moment was proposed using two adjacent cubic-shaped cells. This concept was further extended to arrive at an estimation of the minimum threshold diameter of a foam extrudate to produce an open-cell foam structure. A continuous extrusion process for the manufacture of low-density, microcellular, open-cell thermoplastic foams is presented using a single-screw tandem extrusion foaming system. Fundamental studies have been conducted to investigate the effects of various processing parameters and materials compositions on the basic properties (i.e., extensional behavior, solubility, diffusivity, and initial foam extrudate shape) of plastic melts and melt/gas solutions that influence the cell morphologies of thermoplastic foams. The observed phenomena were essential in understanding and devising the processing strategies to achieve a desired foam structure. Based on the fundamental studies, this thesis presents the basic strategies for promoting a low-density, microcellular, open-cell thermoplastic foam. The effects of polymer blending, additives, processing temperature, blowing agent content, die geometry, and surface quenching on the final foam morphologies were thoroughly investigated to verify the proposed strategies. By tailoring the material compositions and processing conditions, low-density (>10 fold), microcellular (109 cells/cm 3), open-cell (>95%) thermoplastic foams were successfully achieved. Furthermore, a procedure for estimating gas loss from a foam structure was proposed in order to understand the effect of gas loss during open-cell content measurement using a gas pycnometer, and the corresponding open-cell content errors were calculated.
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 Blowing Agents and Foaming Processes 2014 written by Smithers Rapra and published by Smithers Rapra. This book was released on 2014-07-14 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Blowing Agents and Foaming Processes is now the longest and most successful running conference on this subject, offering strategic insights from industry leaders within this growing market.This event is the prime opportunity to engage with those involved in the manufacturing of blowing agents, foam insulation and packaging, foam extrusion and equipment manufacture. It brings together processors, materials suppliers, resin manufacturers, academics and end-users to discuss latest developments and findings in this area. This year's conference represented a diverse and interactive agenda, with presentations from across the industry supply chain, a showcase of innovative foamed products and an exclusive live demonstration of injection moulding technology.These proceedings cover all the presentations from the two day event which illustrated the dynamic and progressive nature of this industry pushed by a challenging market with substantial and evolving requirements.
Download or read book Thermoplastic Foam Extrusion written by James L. Throne and published by Hanser Gardner Publications. This book was released on 2004 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique introduction covers both low- and high-density thermoplastic foams in an easy-to-follow style that avoids excursions into the theoretical aspects of foam processing.
Download or read book Extrusion Foaming of Plastic wood fiber Composites Using a Chemical Blowing Agent written by Ghaus Muhammad Rizvi and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Thesis presents a study on feasibility of continuous extrusion processing for the manufacture of fine-celled plastic/wood-fiber composite foams. The main benefits of incorporating wood-fibers in plastics are the increased stiffness and lowered cost of the resulting composites. However, these improvements are usually accompanied by loss in the ductility and impact resistance of the composites. These shortcomings can be removed by effectively foaming and incorporating a fine-cell structure in the composites. Moisture removal is an important requirement for improving the foam structure. Various schemes of online moisture removal were explored and a promising process for the production of fine-celled plastic/wood-fiber composites foams has been developed. HDPE/wood-fiber composite foams, with significantly improved cell structure and a high volume expansion ratio up to nine-fold, have been successfully produced. For less stringent requirements, the feasibility of using the water, inherently present in the wood-fiber, as a blowing agent was also explored. The addition of a nucleating agent significantly improved the cell structure of PS/wood-fiber composite foams.
Download or read book Foam Extrusion written by S.-T. Lee and published by . This book was released on 2014-01-01 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combining the science of foam with the engineering of extrusion processes, Foam Extrusion: Principles and Practice delivers a detailed discussion of the theory, design, processing, and application of degradable foam extraction. In one comprehensive volume, the editors present the collective expertise of leading academic, research, and industry specialists while laying the scientific foundation in such a manner that the microscopic transition from a nucleus to a void (nucleation) and macroscopic movement from a void to an object (formation) are plausibly addressed. To keep pace with significant improvements in foam extrusion technology, this Second Edition Includes new chapters on the latest developments in processing/thermal management, rheology/melt strength, and biodegradable and sustainable foams Features extensive updates to chapters on extrusion equipment, blowing agents, polyethylene terephthalate (PET) foam, and microcellular innovation Contains new coverage of cutting-edge foaming mechanisms and technology, as well as new case studies, examples, and figures Capturing the interesting evolution of the field, Foam Extrusion: Principles and Practice, Second Edition provides scientists, engineers, and product development professionals with a modern, holistic view of foam extrusion to enhance research and development and aid in the selection of the optimal screw, die design, and foaming system.
Download or read book Extrusion Processing for Manufacture of Low density Fine celled Polypropylene Foams written by Hani E. Naguib and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A continuous extrusion process for the manufacture of low-density, fine-celled polypropylene foams is presented. Due to its outstanding functional characteristics and low material cost, polypropylene foams have been considered as a substitute for other thermoplastic foams in industrial applications. However, only limited research has been conducted on the production of polypropylene foams because of the weak melt strength, and no research has been conducted to investigate the mechanisms that govern the expandability of polypropylene foams. This thesis presents the effective strategies for increasing the volume expansion ratio as well as the mechanisms governing the foam density of polypropylene foams. The basic strategies taken in this study for the promotion of a large volume expansion ratio of polypropylene foams are: (a) to use a branched material for preventing cell coalescence; (b) to use a long-chain blowing agent with low diffusivity; (c) to lower the melt temperature for decreasing gas loss during expansion; and (d) to optimize the processing conditions in the die for avoiding premature crystallization. The effects of processing and materials parameters on the foam morphologies of polypropylene materials were thoroughly studied using a single-screw tandem foam extrusion system. A careful analysis of extended experimental results obtained at various processing conditions indicates that the final volume expansion ratio of the extruded polypropylene foams blown with butane is governed either by loss of blowing agent or by crystallization of the polymer matrix. By tailoring the processing conditions in the die, ultra low-density, fine-celled polypropylene foams with very high expansion ratio up to 90-fold were successfully produced from the branched polypropylene resins. Fundamental studies have also been conducted to investigate the effect of various processing and materials parameters on the thermodynamic, thermal and melt fracture behaviors of polypropylene melts with foaming additives that influence the cell morphology of polypropylene foams.
Download or read book Additive Manufacturing for Polymers written by Jianlei Wang and published by Frontiers Media SA. This book was released on 2023-10-16 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: 3D printing, also known as additive manufacturing, is a manufacturing process that connects materials layer by layer to produce a solid object based on networked digital model files. Advantages of 3D printing over traditional manufacturing include less material consumption, lower costs, faster production process, customizable degrees of freedom and complexity of geometric shapes. The traditional manufacturing of a functional structural part often requires multiple independent process steps, while 3D printing can fabricate the same part in one step, enabling small batch production and customization of personalized products. Due to the diversity of materials available, 3D printing for polymer can be used to create lightweight complex structures in aerospace, models of architectural structures, art reproductions, and biological tissues and organs.
Download or read book Dictionary of Composite Materials Technology written by Stuart M. Lee and published by CRC Press. This book was released on 1995-11-26 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over 6,000 definitions of terms used in both the scientific and engineering aspects of composite materials (in its broadest sense), from simple fibrous materials to the most advanced aerospace applications. Includes listings such as smart and low observability composites, squeeze casting, LARC, PMR,
Download or read book Handbook of Manufacturing Engineering and Technology written by Andrew Y. C. Nee and published by Springer. This book was released on 2014-10-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Springer Reference Work Handbook of Manufacturing Engineering and Technology provides overviews and in-depth and authoritative analyses on the basic and cutting-edge manufacturing technologies and sciences across a broad spectrum of areas. These topics are commonly encountered in industries as well as in academia. Manufacturing engineering curricula across universities are now essential topics covered in major universities worldwide.
Download or read book Databook of Blowing and Auxiliary Agents written by George Wypych and published by Elsevier. This book was released on 2022-03-11 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: Databook of Blowing and Auxiliary 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 Plastics Materials and Processes written by Charles A. Harper and published by John Wiley & Sons. This book was released on 2003-10-10 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plastics Materials and Processes: A Concise Encyclopedia is a resource for anyone with an interest in plastic materials and processes, from seasoned professionals to laypeople. Arranged in alphabetical order, it clearly explains all of the materials and processes as well as their major application areas and usages. Plastics Materials and Processes: A Concise Encyclopedia: Discusses and describes applications and practical uses of the materials and processes. Clear definitions and sufficient depth to satisfy the information seekers needs
