Web transport system including fluid shield
A web transport system for transporting a web of media along a web-transport path includes a fluid bar for guiding the web of media, and first and second fluid shields positioned proximate to first and second ends of the fluid bar. A liquid is pumped through holes in an exterior bearing surface of the fluid bar into a region between the web of media and the bearing surface of the fluid bar, thereby pushing the web of media away from the fluid bar. The fluid shields are positioned to redirect fluid that is ejected from the region between the web of media and the bearing surface of the fluid bar along the edges of the web of media.
1. A web transport system for transporting a web of media along a web-transport path, the web of media having a width in a cross-track direction from a first edge to a second edge, comprising:
a fluid bar disposed along the web-transport path and spanning the width of the web of media, the web of media being guided as the web of media passes the fluid bar with a first surface of the web of media facing an exterior bearing surface of the fluid bar, wherein a liquid is pumped through holes in the bearing surface of the fluid bar and into a region between the first surface of the web of media and the bearing surface of the fluid bar, thereby pushing the web of media away from the fluid bar, and wherein the fluid bar is not submerged in a liquid, the fluid bar having a first end proximate to the first edge of the web of media and a second end proximate to the second edge of the web of media; and
first and second fluid shields positioned proximate to the first and second ends of the fluid bar, respectively, the first and second fluid shields being positioned to redirect fluid that is ejected from the region between the first surface of the web of media and the bearing surface of the fluid bar along the first and second edges of the web of media, respectively.
2. The web transport system of claim 1 , wherein the first and second fluid shields partially surround the first and second ends of the fluid bar, respectively.
3. The web transport system of claim 1 , wherein the first and second fluid shields include side walls that are substantially perpendicular to the cross-track direction and are adapted to block fluid from flowing in the cross-track direction beyond the first and second ends of the fluid bar, respectively.
4. The web transport system of claim 3 , wherein the first and second fluid shields include overhangs extending inward from the side walls over the first and second edges of the web of media, respectively, wherein the overhangs block fluid from flowing away from the fluid bar in a direction normal to the bearing surface.
5. The web transport system of claim 4 , wherein the web of media is wrapped around the fluid bar for a wrap angle, and wherein the overhangs of the first and second fluid shields extend around the fluid bar for an angle which is at least as large the wrap angle.
6. The web transport system of claim 4 , wherein a distance between the overhangs of the first and second fluid shields and the bearing surface of the fluid bar is substantially constant.
7. The web transport system of claim 1 , further including a scavenger blade disposed along the web-transport path downstream of the fluid bar, the scavenger blade spanning the web of media in a cross-track direction and including a blade edge facing the first surface of the web of media, the blade edge being spaced apart from the first surface of the web of media by a gap distance.
8. The web transport system of claim 7 wherein the scavenger blade removes liquid from the first surface of the web of media as it passes by the scavenger blade, thereby reducing the amount of liquid that is carried along to portions of the web-transport path that are downstream of the scavenger blade.
9. The web transport system of claim 7 wherein the scavenger blade blocks fluid that is sprayed out from the region between the first surface of the web of media and the bearing surface of the fluid bar from reaching portions of the web-transport path that are downstream of the scavenger blade.
10. The web transport system of claim 1 , wherein the web-transport path advances the web of media through a tank of the liquid upstream of the fluid bar.
11. The web transport system of claim 10 , wherein the liquid that is redirected by the first and second fluid shields is directed into the tank of the liquid.
12. The web transport system of claim 10 , wherein the liquid is a plating solution for an electroless plating process, and wherein a plating substance in the plating solution is plated onto predetermined locations on the web of media as it is advanced through the plating solution in the tank of liquid.
13. The web transport system of claim 1 , wherein the web of media is redirected by more than 10 degrees as it passes around the fluid bar.
14. The web transport system of claim 1 , wherein the bearing surface of the fluid bar has an arc-shaped cross-section.