Studies on melt spinning. II. Analysis of the deformation and heat transfer processes

Lamonte, Ronald R.; Han, Chang Dae

doi:10.1002/app.1972.070161220

Cited by 33 publications

(16 citation statements)

References 22 publications

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“…Fundamental equations (1-D model), describing the axial distributions of diameter, velocity, temperature, stress and structures of the fiber during melt spinning process, have been proposed by Ziabicki [1], Kase et al [2,3] and Han et al [4][5][6] in the 1960s, and further developed and modified next by other authors [7][8][9]. Recently, Kikutani et al [10] and Blanco-Rodríguez et al [11] studied the axial profiles of conditional parameters of sheath-core bi-component fibers.…”

Section: Introductionmentioning

confidence: 99%

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Studies on melt spinning of sea-island fibers. II. Dynamics of melt spinning of polypropylene/polystyrene blend fibers

Chen

Zhang

et al. 2015

Fibers Polym

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A two-dimensional (2-D) model for melt spinning of iPP/aPS blend fibers is proposed based on two-phase models on density and crystallinity and log-additive rule on elongational viscosity. A computer program is developed based on a hybrid method of fourth-order Runge-Kutta method and implicit Crank-Nicolson method to solve the model equations to obtain the axial profiles of fiber diameter, velocity, gradient of velocity and crystallinity, and the 2-D profiles of temperature, elongational viscosity and elongational stress. The simulated fiber diameters are compared with the measured diameters to verify the certainness of the simulation. The simulated results show that polymer melt jets solidify at the positions of about 40 cm beneath the spinneret which is verified by on-line measurement of fiber diameter. And the radial gradient of temperature, elongational viscosity and elongational stress reaches to 10 4 to 10 5 o C/m, 10 5 to 10 6 Pa·s/m and 10 5 to 10 6 Pa/m, respectively, at the discussed take-up velocities.

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Section: Introductionmentioning

confidence: 99%

“…The crystallinity-dependent density of PP in the two-phase approximation: (5) For isotactic polypropylene, ρ PP,c =950 kg/m 3 [20], and the temperature dependence of the crystalline component density is assumed to be negligible.…”

Section: Introductionmentioning

confidence: 99%

Studies on melt spinning of sea-island fibers. II. Dynamics of melt spinning of polypropylene/polystyrene blend fibers

Chen

Zhang

et al. 2015

Fibers Polym

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“…The elongation viscosities of LDPE, HDPE, and been indicated 13,30 that the elongation flow curve always shows a slight increase at low deformation PP homopolymers are presented in Figure 8 as a function of deformation rates. All the sample melts rates, followed by a decrease.…”

Section: Resultsmentioning

confidence: 99%

“…Along the spinline, the elongation 5ЊC. 13 If an Arrhenius-type equation can be assumed, viscosity can finally be calculated by the followhence the melt elongation viscosity obtained would ing ratio:…”

Section: Evaluation Of Elongation Viscositymentioning

confidence: 99%

Measurement of elongation viscosity for polymer melts by fiber spinning

Lin

1997

Adv. Polym. Technol.

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The elongation behavior of various polymer melts extruded from the single screw extruder has been studied. Low‐density polyethylene, high‐density polyethylene, polypropylene, and their short glass‐fiber (GF)‐filled composites were used. It was found that the spinning stability was good but the drawability was poor for GF‐filled polymers. The elongation viscosity was measured by use of a Gottfert tensiometer (Rheotens) in the strain rate range from 0.1 to 4 s−1. In regard to the viscosity calculations, a very convenient and straightforward method, especially for molten materials without die swell, is presented. All the sample melts showed slight tension thinning; that is, the elongation viscosity decreased along with the strain rate. It was also found that the elongation viscosity of the GF‐filled polymer may increase along with the fiber content up to a critical value, and then drop if more fiber is added. The influence of the die geometry on the viscosity measurement is discussed. © 1997 John Wiley & Sons, Inc. Adv in Polym Techn 16: 199–207, 1997

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“…At higher rates, the LDPE and PS show unbounded exponential stress growth and the HDPE and PP, only linear stress growth. are able to fit the experimental data for stress buildup if the a parameter in the theory orders ~L D P E < UPS < ~P P -~H D P E (16) where U L D~E is about 0.3 and U H D~E between 0.5 and 1.0.…”

Section: Discussionmentioning

confidence: 95%

Experimental study of elongational flow and failure of polymer melts

Ide

White

1978

J. Appl. Polym. Sci.

142

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SynopsisA new and simple instrument for measurement of elongational flow response of polymer melts in constant uniaxial extension rate experiments is described. Quantitative stress development data are presented for a series of low-density polyethylene (LDPE), high-density polyethylene (HDPE), polystyrene (PS), polypropylene (PP), and poly(methy1 methacrylate) (PMMA) melts. For small elongation rate E, linear viscoelastic behavior was observed; while for large E, LDPE and PS showed exponential stress growth, while HDPE and PP showed only linear stress growth. Stress relaxation experiments were carried out for several of the same melts in the instrument. Elongation to break and mechaniims of f i i e n t failure were studied. HDPE and PP have a tendency to neck and exhibit ductile failure, while a t high E, LDPE and PS seem to show cohesive fracture. The elongational flow stress response data were compared to predictions of nonlinear viscoelastic fluid theory, specifically the Bogue-White formulation. The qualitative differences in responses of the melts studied were explained in terms of different dependences of the effective relaxation times on deformation rate and, more specifically, on values of the a parameter in the theory.

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Studies on melt spinning. II. Analysis of the deformation and heat transfer processes

Cited by 33 publications

References 22 publications

Studies on melt spinning of sea-island fibers. II. Dynamics of melt spinning of polypropylene/polystyrene blend fibers

Studies on melt spinning of sea-island fibers. II. Dynamics of melt spinning of polypropylene/polystyrene blend fibers

Measurement of elongation viscosity for polymer melts by fiber spinning

Experimental study of elongational flow and failure of polymer melts

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