novel approach of measuring the dielectric properties of PET preforms for stretch blow moulding

Polyethylene terephthalate (PET) is the most common plastic material used in injection stretch blow molding (ISBM) process for the manufacturing of bottles. The injection-molded PET preform has to be preheated uniformly to a pliable state before the blowing stage of the process. Microwave technology...

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Bibliographic Details
Published in:Journal of applied polymer science 2008-09, Vol.109 (5), p.3196-3203
Main Authors: Erbulut, D.U, Masood, S.H, Tran, V.N, Sbarski, I
Format: Article
Language:English
Subjects:
Applied sciences
dielectric properties
electromagnetic simulation
Exact sciences and technology
Injection moulding
Machinery and processing
Moulding
Plastics
polyethylene terephthalate (PET) preform
Polymer industry, paints, wood
stretch blow molding
Technology of polymers
waveguide
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Summary:Polyethylene terephthalate (PET) is the most common plastic material used in injection stretch blow molding (ISBM) process for the manufacturing of bottles. The injection-molded PET preform has to be preheated uniformly to a pliable state before the blowing stage of the process. Microwave technology offers a potentially more economical means for preheating the preform in place of the conventional infrared oven heating. For such applications, determination of dielectric properties of PET preform of a given geometry is essential. This article describes a novel approach of measuring the dielectric properties of PET preforms at microwave frequencies instead of the common experimental procedures used for such measurements. The dielectric properties are determined by using both CST Microwave Studio electromagnetic simulation software and the automatic network analyzer together. No complex mathematical solutions are required. Validation of this new approach has been made by comparing the measured dielectric properties of some polymers with those available in the published literature.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.28378