Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1996-11-27
1998-06-16
Griffin, Steven P.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65109, 65276, 65DIG9, C03B 2304
Patent
active
057662959
ABSTRACT:
A fluorescent tube which is used for bulb-type fluorescent lamps is spirally wound, so that the effective length of the tube is increased. While a fluorescent tube is kept vertical, it is rotated and heated evenly at the part to be wound to a glass softening temperature or above by a heating device. The rotation of the fluorescent tube is stopped, and the part which is not facing a rod are heated. Then, the tube is clamped from a horizontal direction by a pair of clamps, and is wound around the rod at least 2.5 times by rotating the clamp arms in opposite directions while the arms gradually shift away from each other.
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Asai Shunji
Oga Toshiyoshi
Saito Masaru
Griffin Steven P.
Matsushita Electronics Corporation
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