Determination of induced modulus of PET bottles via free-blowing of preforms
Thanh Tung Nguyen, Yun-Mei Luo, Luc Chevalier
Abstract Objective: The aim of this study is to measure the elastic properties induced by biaxial stretching at different temperatures. This evaluation of the moduli is based on geometric measurements taken during the free-blowing test. Method: Free-blowing experiments of PET preforms are conducted under controlled conditions of fixed temperatures (T°) and pressure (P) conditions. The evolution of the bubble’s diameter and height is monitored until maximum inflation. The pressure is then maintained during the cooling phase, and at a specific temperature, the pressure is released to measure the changes in geometry resulting from elastic recovery. Pressure tests conducted at room temperature on the blown “bottles” validate the measurements obtained during the free-blowing process and allow for the analysis of how the temperature at recovery affects the final induced modulus.
Keywords
Free Blowing, Cooling Phase, Elastic Recovery, Induced Modulus
Published online 5/7/2025, 9 pages
Copyright © 2025 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Thanh Tung Nguyen, Yun-Mei Luo, Luc Chevalier, Determination of induced modulus of PET bottles via free-blowing of preforms, Materials Research Proceedings, Vol. 54, pp 2311-2319, 2025
DOI: https://doi.org/10.21741/9781644903599-249
The article was published as article 249 of the book Material Forming
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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