Mixing in Single Screw Extrusion

ISBN-10: 1847351298
ISBN-13: 9781847351296
Category: Chemistry, Technical
Pages: 300
Language: English
Published: 2009
Publisher: Smithers Rapra Technology
Author: Martin Gale

Description

Extrusion is used for about half of all plastics product manufacture, mostly using single screw extruders. Very often part of their role is the incorporation of one or more of a very wide range of additives, mainly in the form of masterbatches. These range from very visible colours to the invisible traces of anti-block and slip additives. There are also continuing pressures to improve overall economics and these require increased mixing performance in many cases. The situation that mixing in conventional single screw extruders can easily be sub-standard for the application is illustrated in the book's first chapter which describes a number of real examples of inadequate mixing. The book explains why these typical shortcomings occur and the application of mixing principles plus various practical approaches to eliminating such problems. With the growing pressures to increase the amount of plastics recycling, both the limitations and success in blending the mainly incompatible polymer combinations are explained. The development of 'add-on' cavity mixers and floating ring mixers, together with their methodology are described, whilst the associated innovative techniques using liquid injection of colours, tackifiers, lubricants, crosslinking agents and foaming agents, (particularly carbon dioxide) are included. Developments in controlled levels of blending by 'chaotic mixing' to produce products with very specific properties such as barrier films is briefly described. Extrusion tests for carbon black dispersion are included and the book concludes with a practical guide to the preparation of microtomed plastics specimens for evaluation by optical microscopy.

Get the book

Similar books

Analyzing and Troubleshooting Single-Screw Extruders
By Mark A. Spalding, Gregory A. Campbell
The new knowledge in this book will be highly useful for production engineers, technical service engineers working with customers, consultants specializing in troubleshooting and process design, and process researchers and designers that ...
Polymer Mixing and Extrusion Technology
By NicholasP. Cheremisinoff
Depending on the application and type of service, the screw may be cored to allow for heating or cooling. Figure 1 Principal design features of a single-screw extruder. A die can be attached at the end of the extruder.
Screw Extrusion: Science and Technology
By James Lindsay White
This book emphazises the understanding of the underlaying principles of screw extrusion, the design and behavior of screw based machines. It helps the enineer t optimize his equipment and enhance production rates.
Extruder Processing: Comparison of Single- and Twin-Screw Extruders for Optimal Solids Conveying, Melting, and Mixing
By Gregory A. Campbell, Paul G. Andersen
This book covers engineering and technology concepts that should aid the practitioner in comparing these two types of extrusion equipment relative to process requirements.
Extrusion of Polymers 3E: Theory and Practice
By Chan I. Chung
Includes bibliographical references and index.
Extrusion: The Definitive Processing Guide and Handbook
By Harold F. Giles Jr, Eldridge M. Mount, Jr.
Run the extruder feed hopper empty. Procedure to use depends on the temperature increase required. With a 50 F (28 C) change, use the following procedure: e Add resin B to the extruder hopper and continue to run at a high rate through ...
Quantification of Dynamic Mixing Characteristics During Polymer Extrusion
By Ying Lam, 林瀅
Abstract: Abstract of thesis entitled "Quantification of Dynamic Mixing Characteristics During Polymer Extrusion" Submitted by LAM Ying for the degree of Master of Philosophy at The University of Hong Kong in November 2005 In this study, a ...
Pharmaceutical Extrusion Technology
By Feng Zhang, Charles E. Martin, Isaac Ghebre-Sellassie
The first edition of Pharmaceutical Extrusion Technology, published in 2003, was deemed the seminal book on pharmaceutical extrusion.
Mixing in Polymer Processing
By Chris Rauwendaal
"Focusing on the principles of mixing and practical aspects of mixing technology used in the polymer processing industry, this book facilitates the selection of the most suitable mixing machinery for specific applications-emphasizing ...
Hot-Melt Extrusion: Pharmaceutical Applications
By Dennis Douroumis
This is the first book from our brand new series Advances in Pharmaceutical Technology. Find out more about the series here.