Glass manufacturing – Processes – Forming product or preform from molten glass
65 2, 65 12, C03B 37027
For the drawing of an optical fiber from a solid blank, the latter is conducted vertically through a furnace and, during this process, is heated to the drawing temperature at its lower end, from which the fiber is drawn out in the form of a drawing onion. The drawn fiber is then cooled down from the drawing temperature by means of a gas stream moving in the opposite direction to the drawing direction and, in this process, a rotational flow is impressed on the cooling gas stream in addition to the longitudinal flow.
patent: 4673427 (1987-06-01), Van Der Giessen et al.
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patent: 4913715 (1990-04-01), Jochem et al.
patent: 4966615 (1990-10-01), Linden et al.
Lindsay Robert L.
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