Optimisation of Preform Temperature Distribution For the Stretch-Blow Moulding of PET Bottles

Bordival, Maxime; Maoult, Yannick Le; Schmidt, Fabrice

doi:10.1007/s12289-008-0232-8

Cited by 5 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The specific mass ρ and the heat capacity C p are considered together as a one parameter ρC p which is a function of the temperature. According to the values referenced in [4], it appears that ρ is almost independent of the temperature but C p increases while the temperature increases. We propose the following function to represent the evolution of the parameter ρC p :…”

Section: Identification Of the Thermal Properties Of The Pet Sheetsmentioning

confidence: 99%

“…There is a great industrial interest to be able to predict the temperature distribution at the beginning and during the ISBM process: it is a scientific problem that has been addressed by numerous authors during the 15 last years. Many experimental researches [1][2][3] and numerical ones [4][5][6], especially during the last decade, have been carried out to develop competitive processes and to optimize the IR radiation step. Regarding the numerical approach, the works focus on the IR heating modelling and do not considerer the natural convection of air in the boundary conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simplified Modelling of the Infrared Heating Involving the Air Convection Effect before the Injection Stretch Blowing Moulding of PET Preform

Luo

Chevalier

Utheza

et al. 2014

KEM

View full text Add to dashboard Cite

Initial heating conditions and temperature effects (heat transfer with air and mould, self-heating, conduction) have important influence during the ISBM process of PET preforms. The numerical simulation of infrared (IR) heating taking into account the air convection around a PET preform is very time-consuming even for 2D modelling. This work proposes a simplified approach of the coupled heat transfers (conduction, convection and radiation) in the ISBM process based on the results of a complete IR heating simulation of PET sheet using ANSYS/Fluent. First, the simplified approach is validated by comparing the experimental temperature distribution of a PET sheet obtained from an IR camera with the numerical results of the simplified simulation. Second, we focus on the more complex problem of the rotating PET preform heated by IR lamps. This problem cannot be modeled in 2D and the complete 3D approach is out of calculation possibilities actually. In our approach, the IR heating flux coming from IR lamps is calculated using radiative laws adapted to the test geometry. Finally, the simplified approach used on the 2D plane sheet case to model the air convection is applied to the heat transfer between the cylindrical preform and ambient air using a simple model in Comsol where only the preform is meshed. In this case, the effect of the rotation of the preform is taken into account in the radiation flux by a periodic time function. The convection effect is modeled through the thermal boundary conditions at the preform surface using the heat transfer coefficients exported from the simulations of the IR heating of a PET sheet with ANSYS/Fluent. The temperature distribution on the outer surface of the preform is compared to the thermal imaging for validation.

show abstract

Section: Identification Of the Thermal Properties Of The Pet Sheetsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simplified Modelling of the Infrared Heating Involving the Air Convection Effect before the Injection Stretch Blowing Moulding of PET Preform

Luo

Chevalier

Utheza

et al. 2014

KEM

View full text Add to dashboard Cite

show abstract

“…Yang et al [15] revealed that preform temperature as well as the blowing pressure could significantly affect the predicted final bottle characteristics and concluded that to produce a reliable simulation relies on analysing the process conditions as well as the preform temperature. Bordival et al [16] also examined the effect of preform temperature during the simulation; where an optimum preform temperature profile was achieved using the simulation to provide the most uniform thickness distribution. Zimmer et al…”

Section: Introductionmentioning

confidence: 99%

Finite element simulations of stretch-blow moulding with experimental validation over a broad process window

2016

View full text Add to dashboard Cite

Injection stretch blow moulding is a wellestablished method of forming thin-walled containers and has been extensively researched for numerous years. This paper is concerned with validating the finite element analysis of the free-stretch-blow process in an effort to progress the development of injection stretch blow moulding of poly(ethylene terephthalate). Extensive data was obtained experimentally over a wide process window accounting for material temperature and air flow rate, while capturing cavity pressure, stretch-rod reaction force and preform surface strain. This data was then used to assess the accuracy of the correlating FE simulation constructed using ABAQUS/Explicit solver and an appropriate viscoelastic material subroutine. Results reveal that the simulation is able to give good quantitative correlation for conditions where the deformation was predominantly equal biaxial whilst qualitative correlation was achievable when the mode of deformation was predominantly sequential biaxial. Overall the simulation was able to pick up the general trends of how the pressure, reaction force, strain rate and strain vary with the variation in preform temperature and air flow rate. The knowledge gained from these analyses provides insight into the mechanisms of bottle formation, subsequently improving the blow moulding simulation and allowing for reduction in future development costs.

show abstract

“…The material temperature also has a significant effect on the stretch-rod reaction force. Accurately measuring the preform temperature [5] and its effects on the blowing behaviour is critical for understanding the ISBM process.…”

Section: Introductionmentioning

confidence: 99%

Free-stretch-blow investigation of poly(ethylene terephthalate) over a large process window

2016

View full text Add to dashboard Cite

This paper highlights for the first time a full comprehension of the deformation procedure during the injection stretch blow moulding (ISBM) process of poly(ethylene terephthalate) (PET) containers, namely thin-walled rigid bottles. The processes required to form PET bottles are complicated and extensive; any development in understanding the nature of material deformation can potentially improve the bottle optimisation process. Removing the bottle mould and performing free-stretch-blow (FSB) experiments revealed insight into the bottle forming characteristics at various preform temperatures and blowing rates. Process outputs cavity pressure and stretch-rod force were recorded using at instrumented stretch-rod and preform surface strain mapping was determined using a combination of a unique patterning procedure and high speed stereoscopic digital image correlation. The unprecedented experimental analysis reveals that the deformation behaviour varies considerably with contrasting process input parameters. Investigation into the effect on deformation mode, strain rate and final bottle shape provide a basis for full understanding of the process optimisation and therefore how the process inputs may aid development of the preferred optimised container.

show abstract

Optimisation of Preform Temperature Distribution For the Stretch-Blow Moulding of PET Bottles

Cited by 5 publications

References 6 publications

Simplified Modelling of the Infrared Heating Involving the Air Convection Effect before the Injection Stretch Blowing Moulding of PET Preform

Simplified Modelling of the Infrared Heating Involving the Air Convection Effect before the Injection Stretch Blowing Moulding of PET Preform

Finite element simulations of stretch-blow moulding with experimental validation over a broad process window

Free-stretch-blow investigation of poly(ethylene terephthalate) over a large process window

Contact Info

Product

Resources

About