Biaxial deformation and experimental study of PET at conditions applicable to stretch blow molding

G. H. Menary, C. W. Tan, E. M.A. Harkin-Jones, C. G. Armstrong, P. J. Martin

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

This article is concerned with understanding the behavior of polyethylene terephthalate (PET) in the injection stretch blow molding (ISBM) process where it is typically biaxially stretched to form bottles for the packaging industry. A comprehensive experimental study was undertaken, analyzing the behavior of three different grades of PET under constant width (CW), simultaneous (EB), and sequential (SQ) equal biaxial deformation. Experiments were carried out at temperature and strain rate ranges of 80-110°C and 1 s -1 to 32 s -1, respectively, to different stretch ratios. Results show that the biaxial deformation behavior of PET exhibits a strong dependency on forming temperature, strain rate, stretch ratio, deformation mode, and molecular weight. The tests were also monitored via a high speed thermal image camera which showed an increase in temperature between 5°C and 15°C depending on the stretch conditions.

Original languageEnglish
Pages (from-to)671-688
Number of pages18
JournalPolymer Engineering and Science
Volume52
Issue number3
DOIs
Publication statusPublished - 1 Mar 2012

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