Method for stretching a glass rod

Details Method for stretching a glass rod Method for stretching a glass rod

1985-11-25

1986-12-23

Schor, Kenneth M.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65 13, 65108, 65102, C03B 2304

Patent

active

046310797

ABSTRACT:
Control over the diameter variations in a glass rod (10) during the stretching thereof is accomplished by cooling the rod after heating and initial neck down of a portion (22) thereof. After cooling, the rod (10) is reheated, at a lower temperature sufficient to reflow the glass in the necked-down portion (22) thereof, and is then stretched to the desired final diameter. Heating the rod (10) at a lower temperature during stretching increases the viscosity thereof which reduces its response to the stretching conditions, thereby affording better control over diameter fluctuations.

REFERENCES:
patent: 2282993 (1942-05-01), Dichter
patent: 3293019 (1966-12-01), Nitsche et al.
patent: 3556758 (1971-01-01), Andrews et al.
patent: 3652248 (1972-03-01), Loxley et al.
patent: 3852054 (1974-12-01), Dichter
patent: 4247319 (1981-01-01), Hofmann
patent: 4477273 (1984-10-01), Lynch et al.

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