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A method for the production of glass fiber - optical fibers with a rohrfoermigen glass body to a stabfoermigen preform
A method for the production of glass fiber - optical fibers with a rohrfoermigen glass body to a stabfoermigen preform
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机译：一种生产玻璃纤维的方法-将罗尔米金玻璃体制成斯塔福尔米根预制棒的光纤
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摘要
An arrangement for collapsing tubular formations into optical preforms includes a control arrangement which controls the pressure build- up at the downstream end of the tubular formation during all of but the last one of the collapsing increments to control the flow of a gaseous medium through the interior of the tubular formation from an upstream end to and beyond the downstream end of the tubular formation. The magnitude of the back-up pressure is controlled by a set point controller in dependence on the actual value of the back-up pressure, the set point controller being operative for counteracting any deviation from the desired pressure. The set point controller controls the flow-through cross-section of a control valve that admits a pressurized inert gas to a region situated downstream of the downstream end of the tubular formation and also downstream of the point at which the pressure build-up is being measured.
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