US4381934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass batch liquefaction
Assignee: PPG Industries Inc
•
Filing: 1981-07-30
•
Granted: 1983-05-03
•
Expires: 2001-07-30
Abstract
Abstract The initial step of melting glass, converting particulate batch materials to a partially melted, liquefied state, is carried out on a support surface of batch. As liquefied batch is drained from the surface, additional batch is fed onto the surface to maintain the surface substantially constant.
Inventors
- 👤 Gerald E. Kunkle
- 👤 Joseph M. Matesa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:05
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/14; C03B3/00; C03B3/02; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
156 words
A method of liquefying glass batch comprising: in a vessel having a cavity surrounded by sidewalls, an upper inlet end portion, and a lower outlet end portion, maintaining a lining on the interior of the sidewalls comprised of a stable layer of glass batch; feeding glass batch into the vessel at the inlet end portion so as to form a transient layer of glass batch on the stable layer lining; providing heat to the cavity to render the transient batch layer to a molten fluid which flows on the stable batch layer lining toward the outlet end and out of the vessel through an outlet opening in the outlet end portion; and replenishing the transient glass batch layer by feeding additional glass batch onto the stable batch layer at a rate sufficient to maintain the stable batch layer lining substantially constant at a sufficient thickness to thermally protect the vessel from the heat within the cavity.
Claim 2
Independent Claim
156 words
A method of liquefying glass batch comprising: in a vessel having a cavity surrounded by sidewalls, an upper inlet end portion, and a lower outlet end portion, maintaining a lining on the interior of the sidewalls comprised of a stable layer of glass batch; feeding glass batch into the vessel at the inlet end portion so as to form a transient layer of glass batch on the stable layer lining; providing heat to the cavity to render the transient batch layer to a molten fluid which flows on the stable batch layer lining toward the outlet end and out of the vessel through an outlet opening in the outlet end portion; and replenishing the transient glass batch layer by feeding additional glass batch onto the stable batch layer at a rate sufficient to maintain the stable batch layer lining substantially constant at a sufficient thickness to thermally protect the vessel from the heat within the cavity.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the vessel is a metallic vessel.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the surface of the stable layer of batch is a surface of revolution.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the vessel and the stable layer of batch are rotated about the cavity.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein the vessel is an inclined cylindrical tube and is rotated about the axis of the tube.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the vessel is a cylindrical or conical drum, the axis of which is substantially vertical.
Claim 8
Dependent Claim
10 words
The method of claim 6 wherein the vessel is metallic.
Claim 9
Dependent Claim
21 words
The method of claim 1 wherein the stable layer of batch is maintained at a thickness of at least 3 centimeters.
Claim 10
Dependent Claim
30 words
The method of claim 1 wherein the stable layer of batch is provided with a surface sloping at an angle greater than the natural angle of repose of the batch.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein the heat is provided by an oxygen enriched combustion flame.
Claim 12
Dependent Claim
13 words
The method of claim 1 wherein the batch is essentially free of sulfur.
Claim 13
Dependent Claim
15 words
The method of claim 1 wherein the batch fed to the transient layer is dry.
Claim 14
Dependent Claim
28 words
The method of claim 1 wherein replenishment of the transient batch layer includes distribution of batch onto substantially all portions of the surface of the transient batch layer.
Claim 15
Dependent Claim
47 words
The method of claim 1 wherein the replenishment of the transient batch layer comprises depositing a stream of batch onto the upper portion of the batch within the vessel and permitting portions of the deposited batch to tumble onto lower portions of the batch within the vessel.
Claim 16
Dependent Claim
29 words
The method of claim 1 wherein replenishment of the transient batch layer comprises dispersing a stream of batch onto the transient batch layer by means of a gas stream.
Claim 17
Dependent Claim
13 words
The method of claim 15 wherein the gas stream comprises a combustion flame.
Claim 18
Dependent Claim
22 words
The method of claim 1 wherein the molten fluid flowing out of the vessel includes a substantial portion of unmelted batch material.
Claim 19
Dependent Claim
30 words
The method of claim 17 wherein the molten fluid flowing out of the vessel is subsequently subjected to additional thermal energy so as to complete melting of the batch material.
Claim 20
Dependent Claim
44 words
The method of claim 1 wherein minor periodic erosion of the stable batch layer occurs and is repaired by controlling the rate of feeding additional batch so as to maintain a substantially constant interface between the stable batch layer and the transient batch layer.
Claim 21
Dependent Claim
29 words
The method of claim 19 wherein material eroded from the stable batch mass is entrained in the molten fluid passing from the vessel without substantially affecting the composition thereof.
Claim 22
Dependent Claim
20 words
The method of claim 1 wherein the stable batch layer and the transient batch layer have substantially the same composition.
Claim 23
Dependent Claim
26 words
The method of claim 1 wherein the stable batch layer is provided with a surface facing the cavity that is substantially a concave surface of revolution.
Claim 24
Dependent Claim
15 words
The method of claim 22 wherein the concave surface has a vertical axis of symmetry.
Claim 25
Dependent Claim
20 words
The method of claim 23 wherein the vessel is rotated about an axis corresponding to the vertical axis of symmetry.
Claim 26
Dependent Claim
29 words
The method of claim 1 wherein the glass batch is a soda/lime/silica glass batch and the molten fluid is drained from the vessel before its temperature exceeds 2300° F.
Claim 27
Dependent Claim
25 words
The method of claim 1 wherein the melted ingredients in the molten fluid flowing from the vessel include soda ash, caustic soda or boric acid.
Claim 28
Dependent Claim
16 words
The method of claim 26 wherein the molten fluid includes unmelted particles that include sand grains.
Claim 29
Dependent Claim
20 words
The method of claim 1 wherein the heat is provided to the cavity by means of a radiant heat source.
Claim 30
Dependent Claim
16 words
The method of claim 6 wherein the vessel is rotated about the axis of the drum.
Claim 31
Dependent Claim
23 words
The method of claim 29 wherein the drum is metallic and the upper inlet end portion of the vessel includes a ceramic lid.
Claim 32
Dependent Claim
27 words
The method of claim 29 wherein the batch within the vessel is provided with a surface facing the cavity that is substantially a concave surface of revolution.
Claim 33
Dependent Claim
30 words
The method of claim 29 wherein the batch is a flat glass batch and the molten fluid is drained from the vessel at a temperature no greater than 2300° F.
Claim 34
Dependent Claim
17 words
The method of claim 29 wherein heat is supplied to the cavity by a radiant energy source.
Claim 35
Dependent Claim
16 words
The method of claim 33 wherein the radiant energy source is an oxygen enriched combustion flame.
Claim 36
Dependent Claim
14 words
The method of claim 33 wherein the radiant energy source is an electric arc.
Claim 37
Dependent Claim
24 words
The method of claim 29 wherein the batch is a batch composition essentially free from sulfur and is fed to the vessel essentially dry.
References Cited (Backward Citations)
US296227A
Cited
US698766A
Cited
US682365A
Cited
US708309A
Cited
US908151A
Cited
US1082195A
Cited
US1371084A
Cited
US1577602A
Cited
US1621446A
Cited
US1953023A
Cited
US1889509A
Cited
US1863708A
Cited
US1889511A
Cited
US1877714A
Cited
US1928598A
Cited
US2006947A
Cited
US1870636A
Cited
GB400472A
Cited
US1999761A
Cited
US1999762A
Cited
US2074819A
Cited
US2007755A
Cited
US2358903A
Cited
US2154737A
Cited
US2262070A
Cited
US2451582A
Cited
US2398952A
Cited
US2455907A
Cited
US2593197A
Cited
US2834157A
Cited
US3077094A
Cited
US3109045A
Cited
US3151964A
Cited
US3328149A
Cited
US3510289A
Cited
US3637365A
Cited
US3526492A
Cited
US3689679A
Cited
US3917479A
Cited
US3944713A
Cited
US4110097A
Cited
US4113459A
Cited
US4062667A
Cited
US4061487A
Cited
US4138238A
Cited
US4185984A
Cited
US4188201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-02 | 1986-11-01 | 1987-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-02 | 1990-11-01 | 1991-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-02 | 1994-11-01 | 1995-05-03 | $7700.00 | Window Closed / Lapsed |