02520nas a2200265   4500008004100000022001400041245014300055210006900198260000800267300001200275490000700287520162200294653001901916653001901935653001901954653001501973653001801988653001402006100002102020700002202041700002902063700002302092700001802115856012102133       2018                        eng d  a0035-451100aNon-isothermal analysis of extrusion film casting using multi-mode Phan-Thien Tanner constitutive equation and comparison with experiments0 aNonisothermal analysis of extrusion film casting using multimode  cJUL  a493-5030 v573 a<p>Extrusion film casting (EFC) is an industrially important process which produces thousands of tons of polymer films, sheets, and coating used for various industrial as well as household applications. In this paper, we focus on an instability which occurs during certain polymer processing operations operating under predominantly elongational flow, such as extrusion film casting and fiber spinning. This instability, called the draw resonance, occurs in the form of sustained periodic fluctuations in the film dimensions. It appears when the process goes beyond the critical line speed of the EFC process. In this work, a conventional linear stability analysis is carried out for nonisothermal EFC process to determine the onset of the draw resonance. The polymer rheology is modeled by the Phan-Thien Tanner (PTT) multi-mode constitutive equation. For the implementation, a conventional shooting method approach is used. Extrusion film casting experiments were also carried out using a conventional linear low-density polyethylene (LLDPE) by varying process parameters such as draw ratio and aspect ratio, to observe the effect on the stability of the process. Linear stability analysis results under non-isothermal conditions are compared and validated with existing results from literature and with our own experimental data. This work displays the effect of multiple relaxation modes as well as the temperature influence on the stability of EFC process. Finally, results also indicate that the temperature highly affects the stability of the EFC process and cannot be ignored from modeling of EFC process.</p>10aDeborah number10aDraw resonance10aFilm extrusion10aMulti-mode10aNonisothermal10astability1 aChougale, Sanket1 aRokade, Dhammaraj1 aBhattacharjee, Tanushree1 aPol, Harshawardhan1 aDhadwal, Renu  uhttps://library.ncl.res.in/content/non-isothermal-analysis-extrusion-film-casting-using-multi-mode-phan-thien-tanner