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Stretch blow moulding of PET; structure development and constitutive model

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Abstract

Microstructure of PET in stretch blow moulding is studied combining controlled tension followed by quenching, free-blow and ISBM. Due to quenching, observed final microstructure is often closer to a mesophase than to crystal. Texture is, for its part, controlled by the loading path. In fact stretching only induces appearance of an oriented precursor-phase that will become a crystal during cooling steps providing that this latter is slow enough. Microstructure evolution does not obey the classical “nucleation –growth” schematic. This enlightens development of constitutive models demonstrating the irrelevance of the crystallinity ratio as parameter and of the Avrami-like approach as part of the model. One, model based on revisited network approach is suggested.

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Notes

  1. Pressure is not constant because volume increases. The actual 7 bar-nominal pressure corresponds, in fact, to a constant air flux.

  2. (010) planes are roughly perpendicular to the phenyl ring of the monomer. (011) planes contain chain axis.

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Acknowledgments

This work was conducted thanks to The European Commission and its support under the Framework 6 Program via the Apt-Pack strep project (STREP 505204–1).

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Authors and Affiliations

  1. Mines-ParisTech CEMEF, UMR 7635, BP 207, 06904, Sophia-Antipolis, France

    N. Billon & M. Picard

  2. Nestlé Waters, 12 Bd Garibaldi, Issy les Moulineaux, France

    E. Gorlier

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  1. N. Billon
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  2. M. Picard
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  3. E. Gorlier
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Correspondence to N. Billon.

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Billon, N., Picard, M. & Gorlier, E. Stretch blow moulding of PET; structure development and constitutive model. Int J Mater Form 7, 369–378 (2014). https://doi.org/10.1007/s12289-013-1131-1

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