Model of steady‐state melt spinning at intermediate take‐up speeds

Abstract

A model of melt spinning has been developed for speeds above which the effects of gravity, inertia, and aerodynamic drag become significant. The model has as an upper bound the speed at which stress crystallization begins to occur on the spin line. For poly(ethylene terephthalate), these velocities are approximately 750 and 3500 meters/minute. The calculated temperature and velocity profiles are shown to agree with measured values. The stress at the freeze point is calculated and found to correlate well with the spun yarn birefringence which, in turn, is shown to predict uniquely the spun yarn physical properties on a “simple” spin line. The stress‐optical coefficient derived from the calculated stress at the freeze point and measured birefringence agrees well with the literature.

Drawing and extrusion of semi-crystalline polymers

“…Since the fraction of"shish-kebab" in the fiber as spun is rather limited the same applies to the total orientation [193][194][195][196]. Instead of spinning one may also apply a high electric field that yields some molecular orientation in the extracted jet [197].…”

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

“…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.…”

Polyester fiber spinning analyzed with multimode Phan Thien-Tanner model

“…A precise calculation of heat transfer and air friction should take into account the mutual influence of the fibers upon each other (Beyreuther and Bruenig [46], Jeon and Cox [47]). Denn [9] stated that the information provided by George [3] was not sufficient to reproduce the corrections he made. Vassilatos et al [4] reported that they carried out their trials with a spinning plate having 34 holes but did not provide more information.…”

“…Table 3 indicates the values which we used for our calculations and which allowed obtaining very good results. The experimental data used for the validation of our algorithm were taken from the publications of George [3] and Vassilatos et al [4], Table 4. The information given in these papers about the experimental conditions was not complete.…”

“…George [3] ran spinning trials at medium speeds up to 3000 m/min where no noticeable crystallization occurs. Vassilatos et al [4] investigated polyester fiber spinning at speeds up to 6000 m/min.…”