US4349369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating glass
Assignee: BFG Glassgroup GIE
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Filing: 1981-01-26
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Granted: 1982-09-14
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Expires: 2001-01-26
Abstract
Abstract In the formation of a metal or metal compound coating on a face of a heated glass substrate during its forward displacement by contacting such face, at a coating station with at least one stream of droplets comprising one or more substances from which said coating is formed there is a problem in forming uniform high quality coatings which are free from structural defects. To help reduce this problem, the stream(s) of droplets (e.g. from spray gun 20) is or are repeatedly displaced along a transverse path (defined by guide 15) across the substrate (4), and gas is propelled (e.g. from discharge nozzles 24) unidirectionally forwardly or rearwardly across said transverse path, out of line with the droplet stream(s).
Inventors
- 👤 Robert Van Laethem
- 👤 Albert Van Cauter
- 👤 Robert Terneu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:11
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/001; C03C17/002; C03C17/22; C03C17/23; C03C17/25; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/229; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/112
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
105 words
In a process of forming a metal or metal compound coating on a face of a heated glass substrate during its displacement in a given direction, constituting the forward direction of displacement, by contacting such face, at a coating station through which the substrate passes, with at least one stream of droplets composed of at least one substance from which the coating metal or metal compound is formed on the face, the improvement comprising repeatedly displacing said stream of droplets along a transverse path across the substrate, and propelling gas unidirectionally forwardly or rearwardly across said transverse path, out of line with said droplet stream.
Claim 2
Dependent Claim
105 words
In a process of forming a metal or metal compound coating on a face of a heated glass substrate during its displacement in a given direction, constituting the forward direction of displacement, by contacting such face, at a coating station through which the substrate passes, with at least one stream of droplets composed of at least one substance from which the coating metal or metal compound is formed on the face, the improvement comprising repeatedly displacing said stream of droplets along a transverse path across the substrate, and propelling gas unidirectionally forwardly or rearwardly across said transverse path, out of line with said droplet stream.
Claim 3
Dependent Claim
25 words
A process according to claim 1, characterised in that the propelled gas is drawn from a source extraneous to the normal environment above the substrate.
Claim 4
Dependent Claim
59 words
A process according to claim 1 or 2, characterised in that the said step of propelling gas takes place from an orifice or orifices which is or are stationary and is effected intermittently in timed relation to the movements of the droplet stream along the said transverse path so that the propelled gas does not encounter the droplet stream.
Claim 5
Dependent Claim
44 words
A process according to claim 3, characterised in that the said transverse path of the droplet stream extends beyond the corresponding limits of the substrate area to be coated, and gas is intermittently propelled simultaneously across all regions of said path between said limits.
Claim 6
Dependent Claim
44 words
A process according to claim 1 or 2, characterised in that said step of propelling gas is effected continuously from an orifice or orifices which is or are displaced across the path of the substrate, in tandem with the source of the droplet stream.
Claim 7
Dependent Claim
61 words
A process according to claim 5, characterised in that in each displacement of the droplet stream across the substrate gas is propelled from a discharge orifice which follows the source of the droplet stream in such displacement so that the passage of the stream through a given region along said path is followed by a flow of gas across that region.
Claim 8
Dependent Claim
26 words
A process according to claim 1 or 2, characterised in that said step of propelling gas takes place to propel the gas in the forward direction.
Claim 9
Dependent Claim
35 words
A process according to claim 1 or 2, characterised in that the source of the droplet stream is at a distance, measured normally to the substrate face being coated, of from 15 to 35 cm.
Claim 10
Dependent Claim
27 words
A process according to claim 1 or 2 characterised in that the substrate is a continuous ribbon of flat glass travelling from a flat glass forming plant.
Claim 11
Dependent Claim
22 words
A process according to claim 9, characterised in that the substrate is a ribbon of float glass travelling from a float tank.
Claim 12
Dependent Claim
40 words
A process according to claim 9 characterised in that at least one said droplet stream impinges on the top face of the ribbon at a position where the temperature of the glass is within the range 650° to 100° C.
Claim 13
Dependent Claim
33 words
A process according to claim 1 or 2, characterised in that the droplets are droplets of a solution of a metal chloride from which a metal oxide coating forms on said substrate face.
Claim 14
Dependent Claim
16 words
A process according to claim 12, characterised in that said solution is a tin chloride solution.
Claim 15
Dependent Claim
54 words
A process according to claim 1 or 2, characterised in that suction forces are created in exhaust ducting to draw gases environmental to said droplet stream continuously away from the said transverse path of the droplet stream, in the same direction along the substrate as that in which gas is propelled across said path.
Claim 16
Dependent Claim
21 words
A process according to claim 1, characterised in that at least one said droplet stream is downwardly inclined towards the substrate.
Claim 17
Dependent Claim
33 words
A process according to claim 15, characterised in that the included angle between the axis of the droplet stream and the substrate face being coated is in the range of 20° to 60°.
Claim 18
Dependent Claim
40 words
A process according to claim 15 or 16, characterised in that use is made of at least one said droplet stream which is a parallel stream or which diverges from its sources at an angle of not more than 30°.
Claim 19
Dependent Claim
21 words
A process according to claim 15 or 16, characterised in that the droplet streams inclined downwardly and forwardly towards the substrate.
Claim 20
Dependent Claim
25 words
A process according to claim 18, characterised in that said step of propelling gas also takes place to propel the gas in the forward direction.
Claim 21
Dependent Claim
20 words
A process according to claim 16, characterised in that said included angle is in the range of 25° to 35°.
References Cited (Backward Citations)
GB1516032A
Cited
GB1523991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |