The drawability of as-spun polypropylene (PP) filaments was studied using a statistical approach including an experimental design and statistical analysis. The use of a statistical experimental design allows all possible interactions as well as main factors to be evaluated. As a result, one two-factor interaction (between winding speed and metering pump speed, WS*MPS) and two main factors (winding speed WS and metering pump speed MPS) were identified as factors having statistical significance on drawability of as-spun PP filaments with risk levels (P values) less than 0.005. The drawability can be improved by controlling the structure of the as-spun filaments, that is a paracrystalline structure combined with a very low overall orientation (birefringence ≤3.2 x 10– 3). Application of twostage drawing also increases the drawability compared with one-stage drawing.
From R. D. Yang | R. R. Mather | A. F. Fotheringham
Biomedical Textiles Research Centre, School of Textiles and Design, Heriot-Watt University, Galashiels, UK
Appeared in International Polymer Processing 2005/01, Page 55-59
Direct link: http://www.polymer-process.com/IPP1863
Drawability of As-spun PP Fibres [258 KB]
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