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US 4,688,516 AGranted
Device for coating webs of material traveling over a backing roll to a controlled thickness
AssigneeJagenberg Aktiengesellschaft
InventorHerbert Sommer
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AssigneeJagenberg Aktiengesellschaft
InventorHerbert Sommer
Estimating the term…
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.
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.
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.
Dependencies are inferred from the claim text.