Medium application device

A device for applying at least one of liquid and pasty application medium to at least one side of a moving substrate, comprising:

• an applicator unit arranged at a distance from the substrate, said applicator unit discharging the application medium onto the substrate as a free application medium jet, said applicator unit being kept at a first predetermined electric potential, the substrate proximate to said applicator unit being kept at a second predetermined electric potential thereby producing an electric field, which exerts a force on said application medium jet as it moves from said applicator unit to the substrate, said force assisting in the movement of said application medium jet, wherein the substrate is one of a surface of a material web and a surface of a transfer roll;
• wherein said applicator unit is a free jet nozzle applicator unit moving said application medium to the substrate substantially by way of expulsion momentum imparted by said free jet nozzle applicator unit;
• a first electrode arrangement for attenuating an air boundary layer carried along by said substrate;
• a suction box;
• and
• a trailing scraper, said first electrode arrangement being positioned between said suction box and said trailing scraper, said first electrode arrangement, said suction box, and said trailing scraper being positioned on an upstream side of said applicator unit.

A device for applying at least one of liquid and pasty application medium to at least one side of a moving substrate, comprising:

• an applicator unit arranged at a distance from the substrate, said applicator unit discharging the application medium onto the substrate as a free application medium jet, said applicator unit being kept at a first predetermined electric potential, the substrate proximate to said applicator unit being kept at a second predetermined electric potential thereby producing an electric field, which exerts a force on said application medium jet as it moves from said applicator unit to the substrate, said force assisting in the movement of said application medium jet, wherein the substrate is one of a surface of a material web and a surface of a transfer roll;
• wherein said applicator unit is a curtain applicator unit, said application medium jet being an application medium curtain that discharges the application medium onto the substrate, said application medium curtain moves from said curtain applicator unit to the substrate substantially under the force of gravity;
• a first electrode arrangement for attenuating an air boundary layer carried along by said substrate;
• a suction box;
• a trailing scraper, said first electrode arrangement being positioned between said suction box and said trailing scraper;
• and
• a second electrode arrangement located on an upstream side of said applicator unit, said second electrode arrangement proximate to said applicator unit and located at a distance from the substrate, said second electrode arrangement being at a third predetermined electrical potential, said second electrode arrangement altering an electrical potential of said application medium curtain as it moves to the substrate, said first electrode arrangement, said suction box, and said trailing scraper being positioned on an upstream side of said second electrode arrangement.

A device for applying at least one of liquid and pasty application medium to at least one side of a moving substrate, comprising:

• an applicator unit arranged at a distance from the substrate, said applicator unit discharging the application medium onto the substrate as a free application medium jet;
• an electrode arrangement located on an upstream side of said applicator unit, said electrode arrangement proximate to said applicator unit and located at a distance from the substrate, said electrode arrangement being at a predetermined electrical potential thereby producing an electric field, which exerts a force on said application medium jet as it moves from said applicator unit to the substrate, said force assisting in the movement of said application medium jet, wherein the substrate is one of a surface of a material web and a surface of a transfer roll;
• a floating potential electrode receiving an electrical field from said electrode arrangement and imparting an electric field to the moving substrate, said floating potential electrode for attenuating an air boundary layer carried along by said substrate;
• a suction box;
• and
• a trailing scraper, said floating potential electrode being positioned between said suction box and said trailing scraper, said floating potential electrode, said suction box, and said trailing scraper being positioned on an upstream side of said electrode arrangement.

A device for applying at least one of liquid and pasty application medium to at least one side of a moving substrate, comprising:

• an applicator unit arranged at a distance from the substrate, said applicator unit discharging the application medium onto the substrate as a free application medium jet;
• an electrode arrangement located on an upstream side of said applicator unit, said electrode arrangement proximate to said applicator unit and located at a distance from the substrate, said electrode arrangement being at a predetermined electrical potential thereby producing an electric field, which exerts a force on said application medium jet as it moves from said applicator unit to the substrate, said force assisting in the movement of said application medium jet, wherein the substrate is one of a surface of a material web and a surface of a transfer roll;
• an attenuating device that attenuates an air boundary layer that is carried along with the substrate upstream of said electrode arrangement, said attenuating device including a suction device;
• and
• a trailing scraper in wiping contact with the substrate downstream of said suction device.

A device for applying at least one of liquid and pasty application medium to at least one side of a moving substrate, comprising:

• a curtain applicator unit that discharges the application medium onto the substrate as a curtain, said curtain moving from said curtain applicator unit to the substrate substantially under the force of gravity;
• a plurality of edge guiding elements that guide lateral edges of said curtain, at least one of said edge guiding elements having a surface being one of roughened and toothed, wherein the substrate is one of a surface of a material web and a surface of a transfer roll;
• and
• an electrode arrangement altering an electric potential of said curtain as it moves from said curtain applicator unit to the moving substrate, said electrode arrangement including at least one electrode strip positioned substantially parallel with at least one of said plurality of edge guiding elements.

A device for applying at least one of liquid and pasty application medium to at least one side of a moving substrate, comprising:

• a curtain applicator unit that discharges the application medium onto the substrate as a curtain, said curtain moving from said curtain applicator unit to the substrate substantially under the force of gravity;
• a plurality of edge guiding elements that guide lateral edges of said curtain, at least one of said edge guiding elements having a surface being one of roughened and toothed, wherein the substrate is one of a surface of a material web and a surface of a transfer roll, at least one said guiding element including an external thread;
• and
• at least one electrode strip positioned substantially parallel with at least one of said plurality of edge guiding elements.

A device for applying at least one of liquid and pasty application medium to at least one side of a moving substrate, comprising:

• a curtain applicator unit that discharges the application medium onto the substrate as a curtain, said curtain moving from said curtain applicator unit to the substrate substantially under the force of gravity;
• a plurality of edge guiding elements that guide lateral edges of said curtain, at least one of said edge guiding elements having a surface being one of roughened and toothed, wherein the substrate is one of a surface of a material web and a surface of a transfer roll, at least one of said guiding elements being displaceable in a direction transverse to the substrate;
• and
• at least one electrode strip positioned substantially parallel with at least one of said plurality of edge guiding elements.

A device for applying at least one of liquid and pasty application medium to at least one side of a moving substrate, comprising:

• a curtain applicator unit that discharges the application medium onto the substrate as a curtain, said curtain moving from said curtain applicator unit to the substrate substantially under the force of gravity;
• a plurality of edge guiding elements that guide lateral edges of said curtain, at least one of said edge guiding elements having a surface being one of roughened and toothed, wherein the substrate is one of a surface of a material web and a surface of a transfer roll, at least one of said guiding elements being angularly adjustable;
• and
• at least one electrode strip positioned substantially parallel with at least one of said plurality of edge guiding elements.

A device for applying at least one of liquid and pasty application medium to at least one side of a moving substrate, comprising:

• a curtain applicator unit that discharges the application medium onto the substrate as a curtain, said curtain moving from said curtain applicator unit to the substrate substantially under the force of gravity;
• a plurality of edge guiding elements that guide lateral edges of said curtain, at least one of said edge guiding elements having a surface being one of roughened and toothed, wherein the substrate is one of a surface of a material web and a surface of a transfer roll;
• and
• an electrode arrangement altering an electric potential of said curtain as it moves from said curtain applicator unit to the moving substrate, said electrode arrangement including at least one electrode strip positioned substantially parallel with at least one of said plurality of edge guiding elements, said at least one electrode strip proximate to at least one of said guiding elements, said at least one electrode strip kept at a predetermined electric potential.