Web coater
AssigneeBeloit Corporation
InventorsRobert J. Alheid, Irvin J. Phillips
Life of this patent
Estimating the term…
Abstract
A traveling web coater for applying a smooth uniform layer of liquid coating of controlled weight onto the surface of a traveling web including a gate coater having a plurality of gate rolls for metering and applying coating to a traveling web supported on a backing roll with an air knife positioned to direct air onto the web downstream from the gate rolls and to essentially smooth the coating removing a minimum amount of the coating which has been accurately metered by the gate rolls.
Claims10
A traveling web coater for applying a smooth uniform layer of liquid coating of controlled weight onto the surface of a fast moving traveling web comprising in combination:
- a plurality of parallel coating gate rolls including metering rolls in close running relationship for accurately metering and transferring coating onto the surface of a traveling web including a transfer roll in close running relationship with the web;
- a backing roll over which a web is threaded with a transfer nip formed with the transfer roll for applying the layer of coating of controlled thickness onto the web supported on the backing roll;
- nip control means controlling the nip pressure between said metering rolls and between the metering rolls and transfer roll;
- means for delivering coating to the upwardly facing nip between adjacent metering rolls with the coating being transferred by the metering rolls and the transfer roll to the web;
- and an air knife positioned downstream of said transfer nip smoothing the transferred coating on the web with the primary function of the knife being to smooth the surface of the layer of coating.
The method of coating a fast moving traveling web which comprises the steps:
- metering liquid coating onto the surface of the traveling web in a controlled metered layer with a series of close running gate rolls including a transfer roll for transferring the coating to the web surface with the gate rolls being pressure and speed controlled for controlling the amount of coating fed onto the web;
- and smoothing the coating which has been applied by the gate rolls with an air knife with the air knife performing principally a smoothing function and removing only an incidental portion of the coating from the surface.
Dependencies are inferred from the claim text.