Method controlling the draw rate in the drawing of a glass feeds

Details Method controlling the draw rate in the drawing of a glass feeds Method controlling the draw rate in the drawing of a glass feeds

1992-12-31

1994-05-24

Jones, W. Gary

Glass manufacturing

Processes

Forming product or preform from molten glass

65 311, 65 13, 65 29, 65DIG13, 65163, C03B 23047

Patent

active

053145178

ABSTRACT:
A method for drawing glass objects from glass feedstock, wherein a dimension of the glass object is measured on-line and controlled by a control structure which compensates for the deadtime between a change to the drawing speed and the measurement of the effect of that change to the measured dimension. The model which compensates for the deadtime is preferably nonlinear, and the control gains and model parameters are preferably continuously calculated during the drawing process. The invention is particularly applicable to drawing optical waveguide cane from optical waveguide preforms.

REFERENCES:
patent: 3652248 (1972-03-01), Loxley et al.
patent: 4076512 (1978-02-01), Mellor et al.
patent: 4280827 (1981-07-01), Murphy
patent: 4631079 (1986-12-01), Clark et al.
patent: 4793840 (1988-12-01), Harding
patent: 5073179 (1991-12-01), Yoshimura
patent: 5079433 (1992-01-01), Smith
O. J. M. Smith, "Closer Control of Loops with Dead Time", Chem. Eng. Progress, vol. 53, No. 5, pp. 217-219, May 1957.
D. M. Koenig, Control and Anaylsis of Noisy Processes, pp. 40-41, 73-85, Prentice-Hall, 1991.
L. R. Glicksman, "The Dynamics of a Heated Free Jet of Variable Viscosity Liquid at Low Reynolds Number", J. of Basic Engineering, pp. 343-354, Sep. 1968.

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