WAXD study of induced crystallization and orientation in poly(ethylene terephthalate) during biaxial elongation

Marco, Yann; Chevalier, Luc; Chaouche, Mohend

doi:10.1016/s0032-3861(02)00488-3

Cited by 45 publications

(36 citation statements)

References 21 publications

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“…Numerous experiments have been performed on the crystallization dynamics during and after uniaxial extension of PET samples at T=353-363K (which is just above the glass transition temperature) after different quenching protocols (Salem 1992a(Salem , 1992b(Salem , 1998Gorlier et al 2001;Middleton et al 2001;Marco et al 2002aMarco et al , 2002b. In general, the onset of flow induced crystallization occurs at %2.5.…”

Section: Extensional Flowsmentioning

confidence: 99%

Towards a rheological classification of flow induced crystallization experiments of polymer melts

2004

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Section: Extensional Flowsmentioning

confidence: 99%

Towards a rheological classification of flow induced crystallization experiments of polymer melts

2004

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“…Numerous researchers world-wide have developed their own test platforms and enabled significant advances to be made in understanding the evolution of microstructure in PET materials under processing conditions [3][4][5][6][7][8][9], and to generate stress strain data that is suitable for developing and validating constitutive material laws [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A novel methodology to characterize the constitutive behaviour of polyethylene terephthalate for the stretch blow moulding process

Yan

Menary

Nixon

2017

Mechanics of Materials

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The stretch blow moulding (SBM) process is the main method for the mass production of PET containers. And understanding the constitutive behaviour of PET during this process is critical for designing the optimum product and process. However due to its nonlinear viscoelastic behaviour, the behaviour of PET is highly sensitive to its thermomechanical history making the task of modelling its constitutive behaviour complex. This means that the constitutive model will be useful only if it is known to be valid under the actual conditions of interest to the SBM process. The aim of this work was to develop a new material characterization method providing new data for the deformation behaviour of PET relevant to the SBM process. In order to achieve this goal, a reliable and robust characterization method was developed based on an instrumented stretch rod and a digital image correlation system to determine the stress-strain relationship of material in deforming preforms during free stretch-blow tests. The effect of preform temperature and air mass flow rate on the deformation behaviour of PET was also investigated.

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“…The material characterisation technique using the biaxial stretching machine was not able to replicate the sequential deformation type for every foreseeable stretch scenario; indeed, only constant width and pure biaxial deformation were captured. The amount of initial linear stretch, and therefore the onset of orientation and eventual strain hardening [19][20][21][22][23][24][25][26][27][28][29], significantly affects the inflation of the preform.…”

Section: Free-blow Analysismentioning

confidence: 99%

Measuring and modelling air mass flow rate in the injection stretch blow moulding process

Salomeia¹,

Menary

Armstrong

et al. 2015

Int J Mater Form

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The injection stretch blow moulding process involves the inflation and stretching of a hot preform into a mould to form bottles. A critical process variable and an essential input for process simulations is the rate of pressure increase within the preform during forming, which is regulated by an air flow restrictor valve. The paper describes a set of experiments for measuring the air flow rate within an industrial ISBM machine and the subsequent modelling of it with the FEA package AbaqusABAQUS. Two rigid containers were inserted into a Sidel SBO1 blow moulding machine and subjected to different supply pressures and air flow restrictor settings. The pressure and air temperature were recorded for each experiment enabling the mass flow rate of air to be determined along with an important machine characteristic known as the 'dead volume'. The experimental setup was simulated within the commercial FEA package AbaqusABAQUS/Explicit using a combination of structural, fluid and fluid link elements that idealize the air flowing through an orifice behaving as an ideal gas under isothermal conditions. Results between experiment and simulation are compared and show a good correlation.

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WAXD study of induced crystallization and orientation in poly(ethylene terephthalate) during biaxial elongation

Cited by 45 publications

References 21 publications

Towards a rheological classification of flow induced crystallization experiments of polymer melts

Towards a rheological classification of flow induced crystallization experiments of polymer melts

A novel methodology to characterize the constitutive behaviour of polyethylene terephthalate for the stretch blow moulding process

Measuring and modelling air mass flow rate in the injection stretch blow moulding process

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