Controlling Necking in Extrusion Film Casting Using Polymer Nanocomposites

Rokade, Dhammaraj; Azad, Lal Busher; Poddar, Suparna; Mishra, Satyendra; Pol, Harshawardhan; Shukla, R.N.

doi:10.1080/00222348.2017.1289797

Cited by 3 publications

(17 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nanocomposite formulations 2.5 PENC and 5 PENC, which had both lower tan d and extensional strain hardening in the rheology measurements, had higher macromolecular chain relaxation times vis-a`-vis the base P-LLDPE, as shown by Rokade et al 42 Both of these rheological characteristics, having their origin in the nanoclay intercalation, enhanced the stability regions for these Figure 9. Draw aspect Ratio (A) versus Draw Ratio (DR) obtained from the numerical linear stability analyses of the EFC process for the three formulations.…”

Section: Figure Clearlymentioning

confidence: 58%

“…Table 1 lists the weight percentages for the three formulations and the formulation codes/labels. 42 The LLDPE resin was filled with either 2.5 wt% or 5 wt % nanoclay (NC) with an equivalent compatibilizer (e.g. 2.5 wt% PEMA in 2.5 wt % NC, etc.…”

Section: Methodsmentioning

confidence: 99%

“…The extruder residence time for the set 300 RPM was between 2 to 3 minutes. The TSE screw profiles are given in detail in our previous work Rokade et al 42 and are not repeated here. The extruder melt strands were quenched in water and then pelletized using a pelletizer (Wuzi K-Tron, China).…”

Section: Methodsmentioning

confidence: 99%

“…In Rokade et al, 42 we discussed how nanoclay dispersion in a linear chain architecture resin, such as LLDPE, and its dispersion affects the nanocomposite rheology and film processability. From oscillatory rheology (not shown here), we showed that the intercalated nanocomposite formulations, 2.5 PENC and 5 PENC, displayed an enhancement in their melt elasticity wherein the nanoclay platelets were most likely hydrodynamically interacting between themselves and with the matrix (containing compatibilizer), and generating responses like a lower tan d. Furthermore, the same hydrodynamic interactions were also responsible for causing strain hardening (melt viscosity increase) under extensional flow in these formulations vis-a`-vis the base unfilled P-LLDPE resin.…”

Section: Rheologymentioning

confidence: 99%

“…8,20,25,[28][29][30][31] In contrast, Iyengar and Co 31 and Tian et al 32 used a nonlinear analysis, Lee and coworkers 33,34 utilized a kinematic wave approach, and Hyun and co-workers used the frequency response method. 35,36 For the last two decades or so, our own research group has devoted much effort towards analysis and modelling the EFC process [37][38][39][40][41][42] and, more recently, towards studying stability. 29,43 In our first paper 43 in this domain we investigated how slow, fast or averaged relaxation modes affect EFC stability analysis under isothermal conditions.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Controlling draw resonance during extrusion film casting of nanoclay filled linear low-density polyethylene: An experimental study and numerical linear stability analysis

Rokade

Chougale

Patil

et al. 2020

Journal of Plastic Film & Sheeting

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Figure Clearlymentioning

confidence: 58%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Rheologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Controlling draw resonance during extrusion film casting of nanoclay filled linear low-density polyethylene: An experimental study and numerical linear stability analysis

Rokade

Chougale

Patil

et al. 2020

Journal of Plastic Film & Sheeting

Self Cite

View full text Add to dashboard Cite

show abstract

Nano-mechanical behaviour of biochar-starch polymer composite: Investigation through advanced dynamic atomic force microscopy

George

Azad

Poulose

et al. 2019

Composites Part A: Applied Science and Manufacturing

View full text Add to dashboard Cite

A rheology and processing study on controlling material and process defects in polymer melt extrusion film casting using polymer blends

Rokade

Patil

Nandimath

et al. 2023

Journal of Plastic Film & Sheeting

Self Cite

View full text Add to dashboard Cite

The primary objective of this research paper is to control the material and process defects in polymer melt extrusion film casting (EFC) process for linear chain architecture polyethylene (PE) resins through polymer blending methodology. Extrusion film casting is a well-known industrially important manufacturing process that is used to manufacture thousands of tons of polymer/plastic films/sheets and coated products. In this research, the necking defect in an EFC process has been studied experimentally for a linear low density polyethylene (LLDPE) resin and attempts have been made to control its necking by blending in a long chain branched (LCB) low density polyethylene (LDPE) resin. The blending methodology is based on the understanding that a LDPE resin displays enhanced resistance to necking as compared to the LLDPE resin. It is found that added LDPE resin enhances necking resistance for the primary LLDPE resin. Further, as the LDPE concentration increases in the blend formulation, the necking is further reduced as compared to pure LLDPE. Analogous to past studies on EFC of linear and long chain branched architecture containing PEs, it is observed that as the LDPE is increased in the blend formulations, the formulations displayed enhanced melt elasticity and extensional strain hardening in rheological studies. It is concluded from this study that polyethylene resins having linear chain architecture can be made amenable to enhanced resistance to necking using appropriate amount of a long chain branched resins. Finally, process defects such as the draw resonance onset could be shifted to higher draw ratios as the LDPE level is increased in the LLDPE-LDPE blend formulation.

show abstract

Controlling Necking in Extrusion Film Casting Using Polymer Nanocomposites

Cited by 3 publications

References 62 publications

Controlling draw resonance during extrusion film casting of nanoclay filled linear low-density polyethylene: An experimental study and numerical linear stability analysis

Controlling draw resonance during extrusion film casting of nanoclay filled linear low-density polyethylene: An experimental study and numerical linear stability analysis

Nano-mechanical behaviour of biochar-starch polymer composite: Investigation through advanced dynamic atomic force microscopy

A rheology and processing study on controlling material and process defects in polymer melt extrusion film casting using polymer blends

Contact Info

Product

Resources

About