US3695218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for coating tapes,sheets and the like with viscous solutions using the air-brush principle
Assignee: Agfa Gevaert AG
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Filing: 1970-06-05
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Granted: 1972-10-03
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Expires: 1990-06-05
Abstract
Abstract In a process for coating tapes or sheets with viscous solutions by the air-brush principle, a steam of air flows in the opposite direction to the movement of the web of material and acts substantially tangentially on the formation of the coating. This steam of air is produced by a vacuum between a bar which has an edge in the form of a ruler edge and the tape which is being coated, which moves past it at a close distance.
Inventors
- 👤 Peter Herzhoff
- 👤 Hans Gref
- 👤 Stephan Platz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:25
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/40; B05D1/42; G; G03; G03C; G03C1/00; G03C1/74
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
239 words
An apparatus for depositing a coating of viscous solution on a longitudinally moving foil comprising a cylindrical guide member over which said foil is longitudinally traversed, a reservoir for said viscous solution contiguous to the side of said foil opposite said cylindrical guide member for applying an excess of said viscous solution to said opposite side of said foil, a ruler strip having a thin edge disposed closely adjacent the coated side of said foil to form a narrow gap between said edge and said foil, a low pressure chamber connected to said cylindrical guide member and the side of said ruler strip disposed adjacent said reservoir whereby a flow of air tangential to said foil and said cylindrical guide member is caused to flow through said gap opposite to said longitudinal movement of said foil for smoothly spreading said coating applied by said reservoir over said foil, a sharp-edged preliminary smoothing element disposed within said low pressure chamber and having a sharp edge disposed adjacent said gap, said sharp edge of said preliminary smoothing element being disposed closely adjacent to the surface of said foil to wipe excess coating solution from said foil immediately before it enters said gap to cooperate with said flow of air in providing a smooth finished coating upon said foil and said thin edge having a convexly rounded contour of a thickness which is a substantial fraction of the width of the gap.
Claim 2
Independent Claim
239 words
An apparatus for depositing a coating of viscous solution on a longitudinally moving foil comprising a cylindrical guide member over which said foil is longitudinally traversed, a reservoir for said viscous solution contiguous to the side of said foil opposite said cylindrical guide member for applying an excess of said viscous solution to said opposite side of said foil, a ruler strip having a thin edge disposed closely adjacent the coated side of said foil to form a narrow gap between said edge and said foil, a low pressure chamber connected to said cylindrical guide member and the side of said ruler strip disposed adjacent said reservoir whereby a flow of air tangential to said foil and said cylindrical guide member is caused to flow through said gap opposite to said longitudinal movement of said foil for smoothly spreading said coating applied by said reservoir over said foil, a sharp-edged preliminary smoothing element disposed within said low pressure chamber and having a sharp edge disposed adjacent said gap, said sharp edge of said preliminary smoothing element being disposed closely adjacent to the surface of said foil to wipe excess coating solution from said foil immediately before it enters said gap to cooperate with said flow of air in providing a smooth finished coating upon said foil and said thin edge having a convexly rounded contour of a thickness which is a substantial fraction of the width of the gap.
Claim 3
Dependent Claim
29 words
An apparatus as set forth in claim 1 wherein the portion of said preliminary smoothing element disposed adjacent said foil and cylindrical guide member is concave relative to them.
Claim 4
Dependent Claim
34 words
An apparatus as set forth in claim 1 wherein said convexly rounded contour has a radius, and the ratio of said radius to the width of said gap ranging from about 0.25 to 0.75.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |