A technique for online biaxial birefringence measurements and its application

From National Research Council Canada

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DOIResolve DOI: https://doi.org/10.1177/8756087904044156
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  1. National Research Council Canada. NRC Industrial Materials Institute
FormatText
TypeArticle
Journal titleJournal of Plastic Film & Sheeting
ISSN8756-0879
1530-8014
Volume20
Issue1
Pages31–41
Subjectpolyethylene terephthalate film; polystyrene film; biaxial orientation; online; off-line; birefringence
Abstract
In this study, we discuss the applications of a birefringence technique for online or off-line quantitative measurement of biaxial orientation in transparent films, sheets, bottles, etc. Absolute values of biaxial birefringence are measured in two directions using a technique based on an incident multiwavelength double beam and photodiode array assemblies, combined with in-house developed software. Both machine and transverse direction birefringences (relative to the normal direction) were measured simultaneously. Film and sheet of different thicknesses can be tested and birefringence values from 0.0005 to 0.25 can be measured. The results reported here are on the use of this technique for online birefringence measurements in two different cases: orientation and relaxation of birefringence during and after deformation of polyethylene terephthalate sheet; and online biaxial orientation of polystyrene sheet monitoring in an industrial process plant.
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PublisherSage
LanguageEnglish
Peer reviewedYes
NPARC number23003014
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Record identifier32769645-40d7-4538-bfc6-2c97e115faf4
Record created2018-04-12
Record modified2020-01-21
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