Title:
Melt spinning of continuous filaments by cold air attenuation

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dc.contributor.advisor Yao, Donggang
dc.contributor.advisor Wang, Youjiang
dc.contributor.author Jia, Jun en_US
dc.contributor.committeeMember Karl Jacob
dc.contributor.committeeMember Kyriaki Kalaitzidou
dc.contributor.committeeMember Wallace W. Carr
dc.contributor.department Materials Science and Engineering en_US
dc.date.accessioned 2011-03-04T21:03:49Z
dc.date.available 2011-03-04T21:03:49Z
dc.date.issued 2010-08-25 en_US
dc.description.abstract Traditionally ultrafine fibers below 1 dpf are produced by extrusion followed by mechanical drawing. A modified melt spinning apparatus with high-speed air nozzle was designed and fabricated to produce continuous polypropylene filaments by cold air drawing only. With this setup, the fiber is quenched and simultaneously attenuated by a symmetric cold air jet. Since the formation of fiber structure is highly dependent on the processing conditions, the new process will provide a unique operation window to study fiber attenuation and structural formation under high-speed cold air drawing. Based on computational fluid dynamics simulation results, a parametric study was carried out under different process conditions which include processing temperature, air velocity and polymer volume flow rate. Effects of changes in processing variables on the fiber diameter, molecular orientation, crystallinity, tensile strength and other properties were studied. Furthermore, a theoretical model was developed to analyze the non-isothermal fiber attenuation mechanisms. The new knowledge obtained in this study would likely yield a new process for producing innovative fiber products. en_US
dc.description.degree Ph.D. en_US
dc.identifier.uri http://hdl.handle.net/1853/37276
dc.publisher Georgia Institute of Technology en_US
dc.subject Melt spinning en_US
dc.subject Polypropylene en_US
dc.subject Fiber en_US
dc.subject.lcsh Melt spinning
dc.subject.lcsh Fibrous composites
dc.title Melt spinning of continuous filaments by cold air attenuation en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Yao, Donggang
local.contributor.corporatename School of Materials Science and Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 34eb411b-9c1d-43b8-b5a6-cf597e5f79cf
relation.isOrgUnitOfPublication 21b5a45b-0b8a-4b69-a36b-6556f8426a35
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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