Patent ID: 6960261

Claim:
Apparatus for applying fluid to a substrate movable in a principal direction of movement comprising: a first slot nozzle capable of receiving the fluid from a fluid source and including a first slot nozzle outlet lying in a plane and having a width adapted to extend transversely to the principal direction of movement for applying a first fluid film onto a side of the substrate to be coated, a second slot nozzle having a second slot nozzle outlet lying in a plane and capable of receiving the fluid from the fluid source and applying a second fluid film onto a side of the substrate to be coated that lies opposite the side coated with the first fluid film, first and second fluid passageways respectively communicating between said fluid source and said first and second slot nozzle outlets, a first movable seal member positioned entirely outside of said first fluid passageway for adjusting the width of said first slot nozzle outlet transversely to the principal direction of movement of the substrate, a second movable seal member positioned entirely outside of said second fluid passageway for adjusting the width of said second slot nozzle outlet transversely to the principal direction of movement of the substrate, a piston movable in said fluid passageway of at least one of said first and second slot nozzles to seal said fluid passageway, and a sealing body extending within the plane of said slot nozzle outlet of said at least one of said first and second slot nozzles, said piston and sealing body cooperating to adjust the width of said slot nozzle outlet transversely to the principal direction of movement of the substrate.