Glass manufacturing – Glassworking or preform by or with reheating means – Heating means movable relative to work during shaping operation
Patent
1992-04-02
1992-12-29
Lindsay, Robert L.
Glass manufacturing
Glassworking or preform by or with reheating means
Heating means movable relative to work during shaping operation
65 312, 65 12, 65109, 65292, C03B 2304, C03B 3700
Patent
active
051748037
ABSTRACT:
A preform tube (31) is caused to be collpased into a preform rod by causing a heat zone (54) provided by a torch assembly (50) to traverse the tube longitudinally in a plurality of passes. During this so-called collapse mode, a muffle tube (100) encloses that portion of the tube which extends through the torch assembly. Advantageously, the muffle tube projects a predetermined distance beyond one major face of the torch assembly. The torch assembly comprises annular semi-circular end plates and as annular semi-circular center portion having a plurality of exit ports through which gases are directed into engagement with the tube. The center portion is caused to be recessed between the end plates thereby causing the heat zone generated by the gases to be narrowed. The narrowing of the heat zone and the substantial confinement of the heat energy within the muffle tube cooperate with increased gas flow rates to cause the tube to be collapsed in a time period which is substantially less than that achieved by prior art methods.
REFERENCES:
patent: 3816149 (1975-04-01), Futerko
patent: 4231777 (1980-11-01), Lynch
patent: 4401267 (1983-08-01), Spainhour
patent: 4433970 (1984-02-01), Spainhour
patent: 4477244 (1984-10-01), Nis et al.
patent: 4477273 (1984-10-01), Lynch et al.
patent: 4645451 (1987-02-01), Schneider et al.
AT&T Bell Laboratories
Lindsay Robert L.
Somers E. W.
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