Back to results
US 6,332,339 B1Granted
Vacuum degassing method for molten glass flow
AssigneeAsahi Glass Company, Limited
InventorsToshiyasu Kawaguchi, Koji Obayashi, Misao Okada, Yusuke Takei
Life of this patent
Estimating the term…
Abstract
When molten glass which is under an atmosphere of pressure P, is fed into a vacuum chamber capable of rendering a pressure to the molten glass to be in a range of 38 [mmHg]-(P-50) [mmHg] to perform degassing to the molten glass, a staying time of the molten glass in the vacuum chamber is in a range of 0.12-4.8 hours, whereby there is obtainable an effective degassing function to the molten glass.
Claims5
A vacuum degassing method for molten glass which comprises:
- feeding, under an atmosphere of pressure P in mmHg, molten glass into a vacuum chamber capable of rendering a pressure to the molten glass to be in a range of 38 mmHg-(P-50) mmHg to perform degassing to the molten glass, and
- discharging the molten glass after having been degassed from the vacuum chamber at a flow rate of Q ton/hr under the atmosphere of pressure P mmHg
- wherein a staying time of the molten glass in the vacuum chamber is in a range of 0.12-4.8 hours, which is obtained by dividing a weight W in tons of the molten glass in the vacuum chamber by a flow rate Q ton/hr of the molten glass,
- wherein the vacuum chamber includes a vacuum degassing vessel in which the molten glass is passed in a substantially horizontal state and is degassed, and a depth H in meters of the molten glass in the vacuum degassing vessel and the weight W in tons of the molten glass satisfy the below-mentioned Formula (1):
- 0.010 m/ton<H/W<1.5 m/ton (1).
2 more elements
A vacuum degassing method for molten glass which comprises:
- feeding, under an atmosphere of pressure P in mmHg, molten glass into a vacuum chamber capable of rendering a pressure to the molten glass to be in a range of 38 mmHg-(P-50) mmHg to perform degassing to the molten glass, and
- discharging the molten glass after having been degassed from the vacuum chamber at a flow rate of Q ton/hr under the atmosphere of pressure P mmHg
- wherein a staying time of the molten glass in the vacuum chamber is in a range of 0.12-4.8 hours, which is obtained by dividing a weight W in tons of the molten glass in the vacuum chamber by a flow rate Q ton/hr of the molten glass,
- wherein the vacuum chamber includes a vacuum degassing vessel in which the molten glass is passed in a substantially horizontal state and is degassed, and
- wherein a surface area of S1 in m2 of an exposed top portion of the molten glass in the vacuum degassing vessel and the flow rate Q ton/hr of the molten glass satisfy the below-mentioned formula (2):
- 0.24 m2 hr/ton<S1/Q<12 m2·hr/ton (2).
3 more elements
Dependencies are inferred from the claim text.