Patent ID: 8689588

Claim:
A glass-melting device for producing glass fibers comprising: a first glass-melting tank that is exposed to a reduced-pressure atmosphere by a sucking device; a first conduit part and a second conduit part extending downward from the first glass-melting tank; a heat-insulating housing integrally covering the first conduit part and the second conduit part; a second glass-melting tank provided below the first conduit part and exposed to an atmospheric-pressure atmosphere; a third glass-melting tank provided below the second conduit part and exposed to an atmospheric-pressure atmosphere; a bushing provided at a bottom part of the third glass-melting tank, the bushing including a number of nozzles; and heating means for separately heating at least any one of the first conduit part and the second conduit part, the first glass-melting tank, the second glass-melting tank, the third glass-melting tank and the bushing, wherein a sum of a horizontal area of the second glass-melting tank and a horizontal area of the third glass-melting tank is ten times or more than a horizontal area of the first glass-melting tank.