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Article: The water permeability of blended polyethylene films
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TitleThe water permeability of blended polyethylene films
 
AuthorsWong, ACY1
 
KeywordsPlastics rubber
 
Issue Date1995
 
PublisherManey Publishing. The Journal's web site is located at http://www.maney.co.uk/search?fwaction=show&fwid=199
 
CitationPlastics, Rubber & Composites Processing and Applications, 1995, v. 23 n. 4, p. 233-240 [How to Cite?]
 
AbstractWater vapour transmission (WVT) characteristics of blended polyethylene films blown from a 45 mm single-screw extruder were examined. For a given die gap size and blow-up ratio, it was found that WVT basically had an exponential decaying relationship with increasing film thickness. For a given film thickness, molecular orientation on the film in the machine direction could be increased by increasing the size of the die gap. It was found that WVT of blended polyethylene films which involved some proportion of long chain side molecular branches components were more susceptible to die gap size effect than those films only involving linear type molecules. This was thought to be attributed to the more molecular orientation in the machine direction. The results showed that for a given degree of orientation in the transverse direction, WVT decreased if film thickness and die gap size increased. This study also demonstrated that lower WVT required longer saturation time and smaller amount of saturated water vapour obtained.
 
ISSN0959-8111
 
DC FieldValue
dc.contributor.authorWong, ACY
 
dc.date.accessioned2010-04-12T01:35:29Z
 
dc.date.available2010-04-12T01:35:29Z
 
dc.date.issued1995
 
dc.description.abstractWater vapour transmission (WVT) characteristics of blended polyethylene films blown from a 45 mm single-screw extruder were examined. For a given die gap size and blow-up ratio, it was found that WVT basically had an exponential decaying relationship with increasing film thickness. For a given film thickness, molecular orientation on the film in the machine direction could be increased by increasing the size of the die gap. It was found that WVT of blended polyethylene films which involved some proportion of long chain side molecular branches components were more susceptible to die gap size effect than those films only involving linear type molecules. This was thought to be attributed to the more molecular orientation in the machine direction. The results showed that for a given degree of orientation in the transverse direction, WVT decreased if film thickness and die gap size increased. This study also demonstrated that lower WVT required longer saturation time and smaller amount of saturated water vapour obtained.
 
dc.description.naturepublished_or_final_version
 
dc.identifier.citationPlastics, Rubber & Composites Processing and Applications, 1995, v. 23 n. 4, p. 233-240 [How to Cite?]
 
dc.identifier.issn0959-8111
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-0029214922
 
dc.identifier.urihttp://hdl.handle.net/10722/57400
 
dc.languageeng
 
dc.publisherManey Publishing. The Journal's web site is located at http://www.maney.co.uk/search?fwaction=show&fwid=199
 
dc.rightsPlastics, Rubber & Composites Processing and Applications. Copyright © Maney Publishing.
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.subjectPlastics rubber
 
dc.titleThe water permeability of blended polyethylene films
 
dc.typeArticle
 
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<description.abstract>Water vapour transmission (WVT) characteristics of blended polyethylene films blown from a 45 mm single-screw extruder were examined. For a given die gap size and blow-up ratio, it was found that WVT basically had an exponential decaying relationship with increasing film thickness. For a given film thickness, molecular orientation on the film in the machine direction could be increased by increasing the size of the die gap. It was found that WVT of blended polyethylene films which involved some proportion of long chain side molecular branches components were more susceptible to die gap size effect than those films only involving linear type molecules. This was thought to be attributed to the more molecular orientation in the machine direction. The results showed that for a given degree of orientation in the transverse direction, WVT decreased if film thickness and die gap size increased. This study also demonstrated that lower WVT required longer saturation time and smaller amount of saturated water vapour obtained.</description.abstract>
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<subject>Plastics rubber</subject>
<title>The water permeability of blended polyethylene films</title>
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Author Affiliations
  1. The University of Hong Kong