Frequency Response Analysis of Polymer Melt Spinning

Devereux, Brian M.; Denn, Morton M.

doi:10.1021/ie00034a020

Cited by 37 publications

(22 citation statements)

References 14 publications

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“…In frequency response analysis, one imposes small sinusoidal disturbances in time on the top of a steady -state and then uses the linearized equations to determine the system output. Frequency response analysis has been used extensively to study melt spinning (Denn, 1980;Kase and Araki, 1982;Devereux and Denn, 1994;Jung et al, 2002Jung et al, , 2004Kohler and McHugh, 2007;Yun and Shin, 2010). Resonance peaks are found near the frequencies corresponding to the imaginary parts of the eigenvalues obtained from linear stability analysis.…”

Section: Frequency Response Analysismentioning

confidence: 99%

Modeling the melt blowing of viscoelastic materials

Zhou

Tan

Janakiraman

et al. 2011

Chemical Engineering Science

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Section: Frequency Response Analysismentioning

confidence: 99%

Modeling the melt blowing of viscoelastic materials

Zhou

Tan

Janakiraman

et al. 2011

Chemical Engineering Science

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“…By controlling the value of γ(0) (i.e., both real and imaginary parts of γ), a perturbation of stress at spinneret, all state variables have been calculated by 4th-order Runge-Kutta method with shooting scheme, satisfying take-up boundary condition [8,18]. In this paper, take-up velocity and take-up area have been primarily adopted as an input and an output, respectively, based on the experimental method by Kikutani group [29].…”

Section: January 2010mentioning

confidence: 99%

“…Accordingly, many researchers in academia and industry have explored the stability and sensitivity issues in this process for the enhanced control of product quality and processability during the past four decades [4][5][6][7][8][9][10][11][12]. Stability studies have mainly focused on the draw resonance phenomenon which is distinguished by the self-sustained periodic oscillation of spinline variables like spinline cross-sectional area and spinline tension over the critical onsets.…”

Section: Introductionmentioning

confidence: 99%

“…Since the first reports on the sensitivity study for polymer extensional deformation processes [6,7], the sensitivity in this process has been extensively exploited, especially using frequency response method, which measures amplitudes of state variables with respect to ongoing sinusoidal disturbances in the linearized systems [8,[17][18][19]21,22]. Also, from the nonlinear transient simulations, Jung et al [13] and Lee et al [16] elucidated the role of tension sensitivity to stabilize the spinning system.…”

Section: Introductionmentioning

confidence: 99%

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Sensitivity of spinning process with flow-induced crystallization kinetics using frequency response method

Yun¹,

Shin

Lee³

et al. 2010

Korean J. Chem. Eng.

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The sensitivity of the low-and high-speed spinning processes incorporated with flow-induced crystallization has been investigated using frequency response method, based on process conditions employed in Lee et al. [1] and Shin et al. [2,3]. Crystallinity occurring in the spinline makes the spinning system less sensitive to any disturbances when it has not reached its maximum onto the spinline in comparison with the spinning case without crystallization. Whereas, the maximum crystallinity increases the system sensitivity to disturbances, interestingly exhibiting high amplitude value of the spinline area at the take-up in low frequency regime. It also turns out that neck-like deformation in the spinline under the high-speed spinning conditions plays a key role in determining the sensitivity of the spinning system.

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“…Novel Opportunities for Polymer Processing with PEG-based PPA Extrusion at reduced temperatures potentially simplifies a design of processing machines for pelletizing, film blowing, and film casting as well as for tube and pipe production. It helps to suppress bubble and helical instabilities in film blowing, as well as draw resonance in film casting and fiber spinning, see [92][93][94]. For extrusion at reduced temperatures with the use of novel PPA less antioxidants in the polymer can be used.…”

Section: Mechanisms Of Lubricationmentioning

confidence: 99%

Low viscous hydrophilic processing additives for extrusion of polyethylene at reduced temperatures

Kulikov

Hornung

Wagner

2010

Polymer Engineering & Sci

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Industry is using fluorinated polymer processing additives (PPA) to delay the onset of sharkskin to higher rates of extrusion of PE resins. Yet it is necessary to keep elevated temperatures during extrusion to reduce apparent melt viscosity. We propose to use low viscous PPA made from reacting mixtures of polyethylene glycol with organic polyacids, phosphoric acid, and polyesters of oxiacids of Phosphorus. Surprisingly, extrusion pressures and apparent viscosity with the novel PPA at reduced temperatures are less, than at elevated temperatures. In total, extrusion pressures can be reduced 2-5 times for concentrations of PPA from 0.1 to 0.5 wt%, while sharkskin melt fracture can be eliminated for concentrations of PPA above 0.02 wt%. Extrusion with the novel PPA at reduced temperatures potentially increases productivity, reduces production cost, and allows processing of PE resins of higher MW and highly filled polymer composites.The use of novel PPA is a challenging opportunity to simplify processing of PO resins. The use of low viscous PEG in the composition of PPA with existing machinery has to be combined with changes in the die design for film blowing, blow molding, and pipe extrusion to extract

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Frequency Response Analysis of Polymer Melt Spinning

Cited by 37 publications

References 14 publications

Modeling the melt blowing of viscoelastic materials

Modeling the melt blowing of viscoelastic materials

Sensitivity of spinning process with flow-induced crystallization kinetics using frequency response method

Low viscous hydrophilic processing additives for extrusion of polyethylene at reduced temperatures

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