@article { ISI:000329101700009,
	title = {Nonisothermal analysis of extrusion film casting process using molecular constitutive equations},
	journal = {Rheologica Acta},
	volume = {53},
	number = {1},
	year = {2014},
	month = {JAN},
	pages = {85-101},
	publisher = {SPRINGER},
	address = {233 SPRING ST, NEW YORK, NY 10013 USA},
	abstract = {<p>Extrusion film casting (EFC) is a commercially important process that is used to produce several thousand tons of polymer films and coatings. In a recent work, we demonstrated the influence of polymer chain architecture on the extent of necking in an isothermal film casting operation (Pol et al., J Rheol 57:559-583, 2013). In the present research, we have explored experimentally and theoretically the effects of long-chain branching on the extent of necking during nonisothermal film casting conditions. Polyethylenes of linear and long-chain branched architectures were used for experimental studies. The EFC process was analyzed using the 1-D flow model of Silagy et al. (Polym Eng Sci 36:2614-2625, 1996) in which the energy equation was introduced to model nonisothermal effects, and two multimode constitutive equations, namely the {\textquoteleft}{\textquoteleft}extended pom-pom{\textquoteright}{\textquoteright} (XPP, for long-chain branched polymer melts) equation and the {\textquoteleft}{\textquoteleft}Rolie-Poly stretch version{\textquoteright}{\textquoteright} (RP-S, for linear polymer melts) equation, were incorporated to account for the effects of polymer chain architecture. We show that the model does a better job of capturing the qualitative features of the experimental data, thereby elucidating the role of chain architecture and nonisothermal conditions on the extent of necking.</p>},
	keywords = {Branched, Extrusion, Film, Linear, Necking, Nonisothermal, Polyethylene},
	issn = {0035-4511},
	doi = {10.1007/s00397-013-0739-x},
	author = {Pol, Harshawardhan and Banik, Sourya and Azad, Lal Busher and Thete, Sumeet Suresh and Doshi, Pankaj and Lele, Ashish K.}
}
@article {46603,
	title = {Controlling draw resonance during extrusion film casting of nanoclay filled linear low-density polyethylene: an experimental study and numerical linear stability analysis},
	journal = {Journal of Plastic Film \& Sheeting},
	volume = {37},
	year = {2021},
	month = {JUL},
	pages = {8756087920978443},
	type = {Article},
	abstract = {<p>Commercially important extrusion film casting (EFC) processes for manufacturing plastic films or sheets are hampered by several instabilities that severely limits their productivity. In this research we focussed on one important instability: the draw resonance that occurs during the EFC process mainly under extensional flow conditions. Draw resonance is the sustained periodic oscillations in the film dimensions, notably film width and thickness, when the process operates beyond a critical draw ratio (CDR). In this research our goal was to reduce this draw resonance instability by incorporating well dispersed nanoclay fillers in a base polymeric resin (such as a linear low density polyethylene - LLDPE) to determine how these nanocomposite (NC) formulations can prevent or reduce the draw resonance defect. EFC experiments were conducted on the base resin and on the NC formulations under non-isothermal conditions to determine the onset of the draw resonance experimentally. Conventional linear stability analysis was performed to determine the onset of the draw resonance defect numerically. Numerical predictions for the onset of draw resonance were in qualitative agreement with our experimental data. Our results showed that incorporating appropriate nanoclay concentrations in a base polymeric resin indeed enhanced the EFC process stability for those polymer formulations and thus can have important economic implications for processors.</p>
},
	keywords = {Draw resonance, extensional strain hardening, Extrusion, Film, hydrodynamic interactions, Nanoclay, Nanocomposites, Polyethylene, Rheology, stability},
	issn = {8756-0879},
	doi = {10.1177/8756087920978443},
	author = {Rokade, Dhammaraj and Chougale, Sanket and Patil, Prashant and Bhattacharjee, Tanushree and Gawande, Dnyaneshwar and Pol, Harshawardhan and Dhadwal, Renu}
}
