By Gregory A. Campbell, Mark A. Spalding
The e-book teaches the basics of single-screw extrusion such that quickly troubleshooting and procedure optimization and layout are attainable. the basic techniques which are happening within the computer are built from the typical reference aspect of a rotating screw quite the normal rotating barrel. those basics are then mixed with the chemistry of polymers and the actual houses regarding processing to troubleshoot and optimize extrusion methods. Many commercial extrusion challenge case reports are awarded. In every one case research, the foundation reason for the matter is pointed out besides the answer. A primary view of the procedures that take place in a single-screw computing device from the normal reference body; i.e., screw rotation. the speculation is mentioned and in comparison to experimental facts and to a rotating barrel reference body. subject matters contain: polymerization chemistry and degradation mechanisms for polymers, actual houses regarding processing (e.g., rheology, warmth ability, dynamic friction, bulk density and pellet compaction, soften density), and 30+ case experiences for troubleshooting extrusion difficulties. a close description of the matter and the answer is gifted so the reader can enforce the answer on their lonesome gear.
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Additional info for Analyzing and Troubleshooting Single-Screw Extrusion
Finally, atactic polypropylene has the methyl groups randomly distributed above and below the plane of symmetry. This material has a glass transition temperature of –10 °C and no melting temperature. Atactic polypropylene is extensively used as a hot melt adhesive and has little or no crystalline structures. It should be emphasized that each of these different stereo structures provides very different physical properties even though the chemical structure of the monomer and polymer is the same.
These two issues will be discussed in detail in Chapter 11. The straight-line representation of bond angles previously depicted is not very representative given the tetrahedral structure of carbon atoms. There is a generally accepted more stylized representation for the carbon atoms, represented in a zigzag fashion, as shown in Fig. 9. In this representation, the hydrogen molecules are located out of the plane of the diagram. Although this comes closer to the structure of the carbon-based polymer molecule, this is still not completely representative of the structure since with single covalent bonds there is a thermalinduced rotation between the carbon bonds.
4 Simple Flow Equations for the Metering Section The efficient operation of a single-screw extruder requires that all three extruder sections, solids conveying, melting, and metering, must be designed to work efficiently and in coordination to have a trouble-free process. The specific analysis for each of these topics will be covered in later chapters. The simple flow calculations for the metering section should be performed at the start of any extruder troubleshooting process. It is presented at this time so that the reader may see how the equations developed in subsequent sections are used at the start of a typical troubleshooting problem.