US4688516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for coating webs of material traveling over a backing roll to a controlled thickness
Assignee: Jagenberg AG
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Filing: 1984-12-17
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Granted: 1987-08-25
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Expires: 2004-12-17
Abstract
Abstract A device for coating webs of material traveling over a backing roll to a controlled thickness, in which the coating material can be applied to the web with a slotted nozzle that extends over the total width of the web and in which the nozzle has an initial-flow regulation gap downstream of which a flow-regulation lip and an excess-removal lip demarcate a flow-regulation chamber. To allow more uniform and higher-quality application of the coating medium and, in particular, to ensure heavier coating weights and improved web printability with simple means, a barrier that demarcates the flow-regulation chamber from the traveling web of material is positioned to the vicinity of the excess-removal lip. The barrier can consist of a knife-like sheet-metal spring, of a roll, of a strip, or of a jet directed opposite to the direction in which the web is traveling. The barrier prevents an isolating layer of air from penetrating into the flow-regulation chamber.
Inventors
- 👤 Herbert Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:47
CPC Classifications
D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/32; D21H23/40; D21H5/00; D21H5/0005; D21H5/0012; D21H5/0015
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
In a device for coating a web of material traveling over a backing roll to obtain a controlled thickness of that coating, the device comprising a slotted nozzle extending over the full width of the web and means for supplying coating medium to the nozzle, wherein the nozzle has an initial-flow-regulation gap and a flow-regulation chamber downstream of the initial-flow-regulation gap and demarcated by a flow-regulation lip and an excess-removal lip, the improvement wherein the excess removal lip comprises a continuous extension from the initial-flow regulation gap and the initial-flow regulation gap extends in a direction to direct flow opposite to the direction of travel of the web to form a barrier jet of coating medium.
Claim 2
Dependent Claim
116 words
In a device for coating a web of material traveling over a backing roll to obtain a controlled thickness of that coating, the device comprising a slotted nozzle extending over the full width of the web and means for supplying coating medium to the nozzle, wherein the nozzle has an initial-flow-regulation gap and a flow-regulation chamber downstream of the initial-flow-regulation gap and demarcated by a flow-regulation lip and an excess-removal lip, the improvement wherein the excess removal lip comprises a continuous extension from the initial-flow regulation gap and the initial-flow regulation gap extends in a direction to direct flow opposite to the direction of travel of the web to form a barrier jet of coating medium.
Claim 3
Dependent Claim
69 words
The device according to claim 1, wherein the initial-flow regulation gap has a surface that faces away from the flow-regulation lip and merges in an arc into the excess-removal lip at a curvature up to 0.012 mm -1 and creates, in conjunction with the backing roll, a gap of 3 to 8 mm, with a flow-breakdown edge on the surface of the initial-flow regulation gap facing the flow-regulation lip.
Claim 4
Dependent Claim
144 words
In a device for coating a web of material traveling over a backing roll to obtain a controlled thickness of that coating, the device comprising a slotted nozzle extending over the full width of the web and means for supplying coating medium to the nozzle, wherein the nozzle has an initial-flow-regulation gap and a flow-regulation chamber downstream of the initial-flow-regulation gap and demarcated by a flow-regulation lip and an excess-removal lip, the improvement wherein the excess removal lip comprises a continuous extension from the initial-flow regulation gap medium and extends to the vicinity of the web to direct flow in a direction perpendicular to the direction of travel of the web and further comprising an overflow lip upstream of the excess-removal lip and means forming a barrier positioned between the overflow lip and the excess removal lip and comprising a resilient initial-flow regulating device.
Claim 5
Dependent Claim
144 words
In a device for coating a web of material traveling over a backing roll to obtain a controlled thickness of that coating, the device comprising a slotted nozzle extending over the full width of the web and means for supplying coating medium to the nozzle, wherein the nozzle has an initial-flow-regulation gap and a flow-regulation chamber downstream of the initial-flow-regulation gap and demarcated by a flow-regulation lip and an excess-removal lip, the improvement wherein the excess removal lip comprises a continuous extension from the initial-flow regulation gap medium and extends to the vicinity of the web to direct flow in a direction perpendicular to the direction of travel of the web and further comprising an overflow lip upstream of the excess-removal lip and means forming a barrier positioned between the overflow lip and the excess removal lip and comprising a resilient initial-flow regulating device.
Claim 6
Dependent Claim
29 words
The device according to claim 3, wherein the excess-removal lip has a component mounted on a support shank and wherein the initial-flow regulating device is supported on said shank.
Claim 7
Dependent Claim
51 words
A device according to claim 3, wherein the initial-flow regulating device includes a stop rail having a flat surface, a doctor strip sliding on the flat surface, a sharp tear-off edge on the doctor strip, and an elastic pressure means resiliently forcing the sharp tear-off strip against the web of material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |