Transient solutions of the dynamics in low-speed fiber spinning process accompanied by flow-induced crystallization

Lee, Joo Sung; Shin, Dong‐Myeong; Jung, Hyun Wook; Hyun, Jae Chun

doi:10.1016/j.jnnfm.2005.08.004

Cited by 32 publications

(25 citation statements)

References 30 publications

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“…More realistic viscoelastic models have been introduced by Lee et al (2001) as Jung et al (1999) coupled the UCM model and heat transfer. Lee et al (2005), Shin et al (2006) as well as McHugh (2007, 2008) introduced stress induced crystallization and the corresponding crystallization energy in the temperature balance equation. McHugh (2007, 2008) used a linear stability analysis and both Giesekus and Pom-Pom viscoelastic models to describe the response of the spinning line to a small variation of a spinning parameter in stable processing conditions.…”

Section: Fibre Spinningmentioning

confidence: 99%

An Overview of Molten Polymer Drawing Instabilities

Agassant¹,

Demay²

2014

Film Processing Advances

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Drawing instabilities and rupture are a serious limitation in polymer fibre and film processing. Onset of these defects depends on the processing conditions, on heat transfer, and on the rheology of the polymer even if some may be encountered for Newtonian fluids. The main part of this paper is devoted to the different forms of the draw resonance instability encountered in fibre spinning, cast-film and film blowing. The time dependent equations are presented for the simplified situation of constant width cast-film. Results of the two possible modelling strategies, linear stability analysis and direct simulation, applied to the different fibre and film processes are discussed.

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Section: Fibre Spinningmentioning

confidence: 99%

An Overview of Molten Polymer Drawing Instabilities

Agassant¹,

Demay²

2014

Film Processing Advances

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“…Considering the basic conservation laws for mass, momentum and energy of th viscous polymer jet one can obtain by averaging over the cross--section of the slende fiber the following set of equations [5,6,7,8].…”

Section: Melt Spinning Modelmentioning

confidence: 99%

“…5,6,7,8) fixed [4]. It is therefore sufficient in the following theory to suppose that system depends only on one scalar parameter.…”

Section: Melt Spinning Modelmentioning

confidence: 99%

Sensitivity of Viscoelastic Melt Spinning Processes with respect to Operation Conditions and Material Constants

Perera

2009

J. Soc. Rheol., Jpn

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The sensitivity of the viscoelastic melt spinning process with respect to parameters has not been reported yet in the literature. The study on the sensitivity of the melt spinning process is quite important industrially because it is closely connected with the subject of productivity and product quality of the industrial process. In this study, we investigated sensitivity of the viscoelastic melt spinning process with respect to the velocity and temperature of the quench air, fiber length and the fluid characteristic relaxation time. Maxwell-Oldroyd model is used to describe the rheology of the polymeric materials. It has been found that the quality of the final product depends on the values of the parameters. Further, we have found that it is not possible to change the parameters arbitrary because it may yield irregular fiber or induce breakage of the individual filaments of the spinline. Key Words: Fiber Spinning / Sensitivity / Maxwell-Oldroyd * ssnp@maths.cmb.ac.lk industrial processes the take-up speed is about 50m/s and the extrusion speed is about 10m/s, see [2]. Hence the filament is stretched considerably in length and therefore it decreases in diameter. The ambient atmosphere temperature is below the polymer solidification temperature such that the polymer is cooled and solidifies before the take-up, see Figure 1. In industrial processes a whole bundle of hundreds of single filaments is extruded and spun in parallel, however for the analysis we consider a single filament. The dynamics of melt spinning processes has been studied by many research groups through-out the world during the last decades starting with early works of Kase [5] and Ziabicki [10]. In later works, the energy balance for the heat transfer was introduced into the model, and more and more sophisticated descriptions, including material effects, Fig. 1. Sketch of the melt spinning process.

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“…First we deal with the isothermal fiber spinning Newtonian, and viscoelastic fluids whose governing equations are shown in following way 4,5,6) .…”

Section: Simple Fiber Spinning Modelsmentioning

confidence: 99%

Phase-Space Analysis of Melt Spinning Processes

Perera

2008

J. Soc. Rheol., Jpn

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to investigate reachability of the final take-up velocity in isothermal viscous, viscoelastic and non-isothermal fibers.Isothermal Newtonian, Maxwell-Oldroyd and non-isothermal Newtonian fibers are considered. Phase-Space Analysis of Melt Spinning ProcessesShyam S.N. Perera Phase-space analysis of the fiber spinning processes has not been reported yet in the literature. The study on phasespace portrait of the melt spinning process is quite important industrially as well as academically because it is closely related to reachability of final velocity and also its theoretical analysis involves the fundamental understanding of the nonlinear dynamics of the process. In this study, we analysed the phase-portrait of simple melt spinning process using isothermal Newtonian, Maxwell-Oldroyd and non-isothermal Newtonian models. We have proven the isothermal and non-isothermal Newtonian models can be solved with any arbitrary final velocity. It has been found that isothermal Maxwell-Oldroyd model has an upper bound for final velocity and which depends on characteristic relaxation time.

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Transient solutions of the dynamics in low-speed fiber spinning process accompanied by flow-induced crystallization

Cited by 32 publications

References 30 publications

An Overview of Molten Polymer Drawing Instabilities

An Overview of Molten Polymer Drawing Instabilities

Sensitivity of Viscoelastic Melt Spinning Processes with respect to Operation Conditions and Material Constants

Phase-Space Analysis of Melt Spinning Processes

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