Effect of biaxial stretching at temperatures and strain histories comparable to injection stretch blow moulding on tensile modulus for Polyethylene Terephthalate (PET)

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

This study is particularly relevant to the injection stretch blow moulding (ISBM) process where PET material is typically biaxially stretched to form bottles for the water and carbonated soft drinks industry. The aim of this paper is to investigate the effect of biaxial stretching on the mechanical properties of Polyethylene Terephthalate (PET) using a custom built biaxial testing machine. An initially amorphous PET sample was prepared via injection moulding to form a square sample (76mm × 76mm) suitable for stretching on the machine. This sample was then subjected to a series of biaxial tests (simultaneous and sequential) within a temperature range between 85°C and 110°C, strain rates in the range of 1s-1 to 32s-1 and stretch ratios in the range of 1.5 to 3. Specimens were subsequently cut from the biaxial stretched sheets and used to measure the tensile modulus. Results showed that there is almost no effect found for strain rate and temperature on modulus development whilst stretch ratio and mode of deformation played the most important role on modulus development on PET under biaxial deformation.

Original languageEnglish
Title of host publication10TH ESAFORM CONFERENCE ON MATERIAL FORMING
Pages835-840
Number of pages6
Volume907
Publication statusPublished - 11 May 2007
Event10TH ESAFORM CONFERENCE ON MATERIAL FORMING - Zaragoza, Spain
Duration: 18 Apr 200620 Apr 2006

Conference

Conference10TH ESAFORM CONFERENCE ON MATERIAL FORMING
CountrySpain
CityZaragoza
Period18/04/0620/04/06

Keywords

  • Biaxial deformation
  • Blow moulding
  • PET

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    Tan, C. W., Menary, G. H., Harkin-Jones, E. M. A., Armstrong, C. G., & Martin, P. J. (2007). Effect of biaxial stretching at temperatures and strain histories comparable to injection stretch blow moulding on tensile modulus for Polyethylene Terephthalate (PET). In 10TH ESAFORM CONFERENCE ON MATERIAL FORMING (Vol. 907, pp. 835-840)