High Speed Melt Spinning of Isotactic Polypropylene Fibers

Shimizu, Jiro; Okui, Norimasa; Imai, Yoshitaka

doi:10.2115/fiber.35.10_t405

Cited by 16 publications

(47 citation statements)

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“…The trends shown in Figure 1 are fairly similar to those previously reported by Shimizu et al, 20 except that the rapid rise in birefringences occurred at spinning speeds below 1500 m/min for Shimizu's sample. The differences between the present results and those of Shimizu et al are readily explained by differences between the resin characteristics of the present polymer and that studied by Shimizu et aL20 We w i l l return to this discussion after presenting further experimental data.…”

Section: Resultssupporting

confidence: 87%

The influence of resin characteristics on the high speed melt spinning of isotactic polypropylene. I. Effect of molecular weight and its distribution on structure and mechanical properties of as‐spun filaments

Lü

Spruiell

1987

J of Applied Polymer Sci

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synopsisThe fine structures and tensile mechanical properties were characterized for high speed melt spun filaments prepared kom three polypropylenes with melt flow indices in the range 12-300. It was found that spinnability and the resulting Structure and properties are affected by both the weight average molecular weight and the polydispkity of the polymer. Higher tenacities, with consequent lower percent elongation to break, could be achieved by spinning the narrow molecular weight distribution polymers at high spinning speeds. This effect was ansociated with the development of higher birefringence in these samples. Modulus did not correlate with birefringence in the present study, but it was found to be controlled by the nature and level of crystalline order developed in the filaments.

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Section: Resultssupporting

confidence: 87%

The influence of resin characteristics on the high speed melt spinning of isotactic polypropylene. I. Effect of molecular weight and its distribution on structure and mechanical properties of as‐spun filaments

Lü

Spruiell

1987

J of Applied Polymer Sci

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“…Silicon oil addition was tested, but its use was discontinued because no change in DSC results occurred when oil was used. Figure 21 shows a typical DSC scan of melt-blown polypro- (Lu and Spruiell, 1987;Shimizu et al, 1979). The percent crystallinity of the melt blown samples was determined by the commonly used relation (Dole, 1967) % crystallinity = ~ AH, -100…”

Section: Crystallinity Of Melt Blownpbersmentioning

confidence: 99%

Melt blowing: General equation development and experimental verification

Uyttendaele¹,

Shambaugh²

1990

AIChE Journal

139

197

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A model has been developed for steady polymer melt blowing. This model includes the dominant effect that the forwarding air has upon the process. Inertial, gravitational and heat transfer effects are also included. The model equations are solved numerically with both Newtonian and viscoelastic (Phan-Thien and Tanner) constitutive equations. The predicted results compare favorably with actual experimental data.

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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%

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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High Speed Melt Spinning of Isotactic Polypropylene Fibers

Cited by 16 publications

References 0 publications

The influence of resin characteristics on the high speed melt spinning of isotactic polypropylene. I. Effect of molecular weight and its distribution on structure and mechanical properties of as‐spun filaments

The influence of resin characteristics on the high speed melt spinning of isotactic polypropylene. I. Effect of molecular weight and its distribution on structure and mechanical properties of as‐spun filaments

Melt blowing: General equation development and experimental verification

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

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