Draw resonance reduction in melt embossing and extrusion coating resins

Roberts, Ε. H.; Lucchesi, P. J.; Kurtz, S. J.

doi:10.1002/adv.1986.060060103

Cited by 9 publications

(1 citation statement)

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“…As EFC is an industrially important process, much research has been done over the past several decades to develop an understanding of the instabilities involved in this process, including the draw resonance phenomena. Draw resonance was first reported by Christensen 1 and Miller 2 and further studied both experimentally and numerically by other researchers including Bergonzoni and DiCresce, 3,4 Fisher and Denn; 5 Ishihara and Kase, 6 Roberts et al, 7 Anturkar and Co, 8 Hyun, 9 Burghelea et al 10 and, very recently, by Bechert. 11 One also cannot forget the stalwart work done by the research group of Prof. Agassant [12][13][14][15][16][17][18][19][20][21][22][23] in this area as well.…”

Section: Introductionmentioning

confidence: 90%

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

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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.

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