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AssigneeHeraeus Tenevo GmbH
InventorsGeorges Levon FATTAL, James E. BEAVERS, Jr., Kai Huei CHANG, Evan P. GREEN, Qiulin MA
Estimating the term…
Methods for preform and tube draw based on controlling forming zone viscosity determined by calculating a holding force exerted by the glass component in the forming zone on the strand being drawn below. The holding force may be calculated by determining a gravitational force applied to the strand and a pulling force applied to the strand by a pulling device, where the holding force is equal to the opposite of the algebraic sum of the gravitational and pulling forces. The holding force may also be calculated by measuring a stress-induced birefringence in the strand at a point between the forming zone and the pulling device, determining an amount of force applied to the strand at the point corresponding to the birefringence, and calculating the holding force by correcting the amount of force for a gravitational effect of the weight of the strand between the forming zone and the point.
A method of measuring the viscosity of a forming region of a glass preform or tubing fabrication process, wherein the fabrication process comprises heating a bulk glass component in a heating region, drawing a strand from the forming region of the bulk glass component, and using a pulling device to control the rate at which the strand is drawn, the method comprising:
A method of producing an elongated component of glass, said method comprising
An apparatus for measuring the viscosity of a forming region of a glass preform or tubing fabrication process, wherein the fabrication process comprises heating a bulk glass component, drawing a strand from the bulk glass component, and using a pulling device to control the rate at which the strand is drawn, the system comprising:
Dependencies are inferred from the claim text.