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Polymer Micropellet and Powder Production Using a Novel Extrusion Process = Polymer Mikrogranulat und Pulver Herstellung unter Verwendung eines neuartigen Extrusionsverfahrens
Başlık:
Polymer Micropellet and Powder Production Using a Novel Extrusion Process = Polymer Mikrogranulat und Pulver Herstellung unter Verwendung eines neuartigen Extrusionsverfahrens
Yazar:
Schäfer, Christian, author.
ISBN:
9780438024144
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (175 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Tim A. Osswald Committee members: Daniel J. Klingenberg; Natalie Rudolph; Christopher J. Rutland; Lih-Sheng Turng.
Özet:
Traditional polymer powder and micropellet based processes, such as powder bed fusion and rotational molding have shown an increased demand in modern processing industries. These processes require polymer powders and micropellets with a small particle size, narrow size distribution and defined geometry for a variety of polymer resins. Therefore, micropelletization technologies, where particles in the size range of 50 microm to 1000 microm are generated, have been attracting growing attention over the past decade. A new technique, developed at the Polymer Engineering Center (PEC) at the University of Wisconsin-Madison, yields micropellets with a controlled morphology and narrow particle size distribution. In this process, a polymer melt is extruded through a capillary and is subsequently stretched with a hot airstream until flow instabilities or melt fracture cause it to break up into particles. Small changes in process conditions result in different size distributions and particle shapes, such as lenticular pellets, fibers and strand segments. This research shows how material properties and processing parameters influence the produced micropellets. Different approaches towards this goal are proposed, including viscoelastic flow simulation, as well as a comprehensive design of experiment and data analysis of the micropelletization process. Preliminary simulation results show the profound effect polymer viscosity and relaxation time have on the micropelletization process.
Notlar:
School code: 0262
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