Patent Document ID: 20140245796
Application ID: 14354130
Patent Flag: 0

Claim One:
1. A method for producing a cylindrical component of glass by elongating a start cylinder using a process control comprising a temperature control loop, said method comprising: feeding a start cylinder beginning with an end thereof and at a feed rate v f to a heating zone with a heating zone temperature T furnace , softening the start cylinder in the heating zone so as to form a softened region, drawing off a component strand in the direction of a drawing axis from the softened region so as to form a drawing bulb, continuously and at a draw rate v s , and cutting the component to length from the component strand, the temperature control loop being used in said drawing off, said control loop comprising: continuously measuring a first temperature value T top at an upper measurement point of the surface of the start cylinder; continuously measuring a second temperature value T bottom at a lower measurement point that is spaced apart from the upper measurement point in the direction of the drawing axis, with the drawing bulb or a part thereof extending between the upper and the lower measurement points; calculating a temperature distribution of the start cylinder in a region between the measurement points of said first temperature value T top and said second temperature value T bottom , and determining a modeled deformation temperature T model on the basis of an algorithmic model using the first and the second temperature values as model input parameters, and using the modeled deformation temperature T model as a controlled variable and using the heating zone temperature T furnace as a manipulated variable of the temperature control loop.