Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1984-07-31
1986-12-30
Schor, Kenneth M.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 312, 65110, 65161, C03B 37012, C03B 3707
Patent
active
046326847
ABSTRACT:
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.
REFERENCES:
patent: 3035371 (1962-05-01), Mouly
patent: 4165224 (1979-08-01), Irven
patent: 4278459 (1981-07-01), Partus
patent: 4389229 (1983-06-01), Jang
Akers Francis I.
Fletcher Daniel G.
Foster Philip E.
Karbassiyoon Kamran
ITT Corporation
O'Halloran John T.
Schor Kenneth M.
Seitter Robert P.
Werner Mary C.
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