High speed melt spinning

Kim, K.H., Cho, H.H., Ito, H., Kikutani, T., 2008. Fiber structure development in high-speed melt spinning of poly(trimethylene terephthalate) (PIT)—on-line measurement of birefringence. J. Polym. Sci. B Polym. Phys. 46, 847 56. 

The effect of molecular weight on high-speed melt spinning of nylon-6 has been studied [219]. In as-spun filaments, higher molecular weights led to high modulus and tenacity and lower elongation to break. 

Lu, F.M. Spruiell, J.E. (1987). 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 JAppl. Polym. Sci., Vol.34, Issue 4, pp.1521-1539. 

Abstract. Kinetic theory of crystal nucleation is proposed for flexible chain polymers subjected to flow deformation with transient molecular deformation and orientation. Significant transient effects in the kinetics of oriented nucleation are expected in melt processing involving high deformation rates, like in high-speed melt spinning. 

Fig. 4.1. Elongation rate vs. processing distance in high-speed melt spinning of PET fibres at take-up speed 4800m/min [1]...

In the present paper a kinetic theory of crystal nucleation is considered for the polymers subjected to time-dependent deformation rates, with transient effects of the chain relaxation. The considerations provide a theory useful in modelling fast polymer processing with stress-induced crystallization, like high-speed melt spinning, melt blowing, electro-spinning, etc. 

K. Mezghani, J. E. Spruiell, High speed melt spinning of poly(L-lactic acid) filaments. 7. Polym. Sci. Part. B1998,36,1005-1012. 

G. Schmack, B. Tandler, R. Vogel, R. Beyreuther, S. Jacobsen, H. G. Fritz, Biodegradable fibers of poly(L-lactide) produced by high-speed melt spinning and spin drawing. J. Appl. Polym. Sci. 1999, 73, 2785-2797. 

In dieir another report, PLA with different Z>-lactide contents, taticities, molecular mass and molecular mass distribution was used in high-speed melt-spinning process [18], The spinnability of PLA with broad mass distribution was extremely restricted. Hie crystallinity of fibers which was influenced by D content and the extent of orientation-initiated crystallization had a decisive influence on the tensile properties Of the investigated PLA fibers. 

High speed melt spinning and spin drawing... 

PP is one of the polymers difficult to employ in high speed melt spinning filaments often break, the mechanical characteristics tend to saturate at rates above 1000 m/min, and Young s modulus is relatively low. 

Rwei S P (2000), Modification of PET in high-speed melt spinning by blending with PEN , Polymer Engineering and Science, 40,191-200. 

Takarada W, Ito H, Kikutani T and Okui N (2001) Studies on high-speed melt spinning of noncircular cross-section fibers I Structural analysis of as-spun fibers . Journal of Applied Polymer Science, 80,1575-1581. 

Wu G, Li Q and Cuculo J A (2000), Fiber structure and properties of poly(ethylene-2,6-naphthalate) obtained by high-speed melt spinning . Polymer, 41, 8139-8150. 

T.Kitukani,J.Radhakrishnan,S.Arikawa,A.Takaku,N.Okui,X.Jin,F.Niwaand Y. Kudo (1996), High-speed melt spinning of bicomponent fibers Mechanism of fiber structure development in poly(ethylene terephthalate)/polypropylene system,/. Appl. Polym. Sci.,62,1913-1924. 

It is seen that Eq. (3.35) becomes identical to Eq. (3.15) only when the symmetric part of tensor x (x - 2i Qd) disappears in other words, when x - 2i Qd = 0. The Giesekus model is very versatile in that it has an additional parameter, the so-called mobility parameter a, which allows for more accurate predictions of the material functions in steady-state shear flow as compared with the ZFD model. This will become clear later in this chapter when we present logarithmic plots of r versus y, and logarithmic plots of Alj versus y based on predictions from both the Giesekus and ZFD models. In Chapter 6 of Volume 2 we will use a modified version of the Giesekus model to simulate the high-speed melt spinning process. 

N., Niwa, F., and Kudo, Y, High-Speed Melt Spinning of Bicomponent Fibers Mechanism of Fiber Structure Development in Polyfethylene tere-phthalate)/Propylene System , Journal of Applied Polymer Science, 62, 1913-1924, 1996. 

Ziabicki, A., The Mechanisms of Neck-Like Deformation in High-Speed Melt Spinning. 1. Rheological and Dynamic Factors , Journal of Non-Newtonian Fluid Mechanics, 30, 141-155, 1988. 

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