Heat-treatment of fiber yarns using heated rotating rolls is a familiar step in fiber processes. The yarn-temperature history is known to have a strong influence on the final properties. In this paper, heat transfer from the roll surface to a thin yarn is analyzed. The equilibrium-temperature variation across the yarn cross section, as it leaves the roll, is related to yarn size, roll diameter, roll speed, heat input, and ambient conditions. Equations are also developed for the yarn-temperature history during the multiple-warp retention of the yarn on the heated roll and a skew idler. The results are compared with experimental observations.
Anderson, O.L. , Cooling Time of Strong Glass Fibers, J. Appl. Phys. 29 , 9-12 (1958).
2.
Andrews, E.H. , Cooling of a Spinning Threadline, British J. Appl. Phys. 10 , 39-43 (1959).
3.
Arthur, D.F. and Jones, C.R., Heat Transfer in Highly Twisted Nylon Yarns, J. Textile Inst. 53, T217-239 (1962).
4.
Barnett, T.R. , Calculation of the Temperature of Filaments in Melt Spinning, Appl. Polymer Symposium No. 6, 51-65 (1967).
5.
Clumpner, J.A., Equations for Calculating the Temperature of Moving Solid Plates and Cylinders Undergoing Heating or Cooling, Paper at Eighth National Heat Transfer Conf., Los Angeles, August 8-11, 1965 .
6.
Glicksman, L.R. , The Cooling of Glass Fibers, Glass Technology9, No. 5, 131-138 (1968).
7.
Grant, R.P. and Krieger, H., Heat Transfer to Fibers Processed on Heated Rolls, Paper at Sixth Annual Synthetic Fiber Symposium, Williamsburg, Virginia, 1969.
8.
Jannink, B.J. , Heat Transfer to Textile Filaments, Paper at Third Annual Synthetic Fibers Symposium, Williamsburg, Virginia, 1966.
9.
Kase, S. and Matsuo, T., Studies in Melt Spinning: I. Fundamental Equations on the Dynamics of Melt Spinning, J. Polymer Sci., Part A, 3, 2541-2554 (1965).
10.
Kays, W.M. and Bjorklund, I.S., Heat Transfer From a Rotating Cylinder With and Without Cross-Flow , Trans. ASME80 , 70-78 (1958).
11.
Rotte, J.W. and Beek, W.J., Some Models for the Calculation of Heat Transfer Coefficient to a Moving Continuous Cylinder, Chem. Eng. Sci. 24, 705-716 (1969).
12.
Sano, Y. and Nishikawa, S., Heat Transfer Coefficients of Fine Yarns in Air Flow, Kagaku Kogaku2, 199-202 (1964).
