Abstract
A novel method has been developed for making the on-line measurement of the diameter profile of neck-like deformation in high-speed melt spinning process. This method utilizes the fluctuation of the position of neck-like deformation in spinline, and can measure the diameter change at a minimum interval of 2mm in the axial direction. Melt spinning of poly (butylene terephthalate) was carried out at take-up velocities of 3.5-5.0km/min, by using a spinning temperature of 255°C and a mass out flow rate of 5.5g/min. The moving velocity of the position of neck-like deformation was estimated as 1-2% of spinning velocity. In contrast to the fact that a diameter profile of conventional melt spinnig is asymptotic to final diameter, the diameter profiles obtained in this study showed an upward curvature at a position more than 50mm distant from the end point of neck-like deformation. Velocity gradient just before the solidification point increased with increasing the take-up velocity. The value of velocity gradient averaged over 2mm in axial direction reached ca. 20ms-1 at a take-up velocity of 5.0km/min.
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