Managing condensation in an inkjet printing system with co-linear airflow
Methods for operating an inkjet printing system are provided. In one method, a cross-module airflow is used to limit concentrations of an evaporated inkjet carrier fluid between barrier that is between inkjet printheads of a printing module and a receiver. In the method, inkjet droplets are printed along a first print line and a second print line as the receiver is moved past the first print line and as the receiver is moved past the second print line. A co-linear airflow that flows along with ink droplets to the receiver is also supplied. Between the first print line and the second print line the receiver is moved to create an integration area in which the cross-module airflow and co-linear airflow can integrate and flow from between the printing module and the receiver without disrupting the travel of ink droplets.
1. A method for operating an inkjet printing system comprising:
moving a receiver along a direction of receiver movement to at least one printhead at a first print line that is not parallel to the direction of receiver movement and then to at least one printhead at a second print line that is not parallel to the direction of receiver movement;
using a cap about each of the printheads that extends from a barrier that is between the inkjet printheads toward the receiver to create a higher resistance flow area between the cap and the receiver and a lower resistance flow channel around the cap;
using the at least one printhead to direct droplets of an ink having a vaporizable carrier toward the receiver at the first print line;
using the at least one printhead to direct droplets of an ink having a vaporizable carrier toward the receiver at the first print line;
generating a co-linear airflow that travels with the inkjet droplets through openings in the caps toward the receiver;
supplying a cross-module airflow to remove vaporized carrier fluid from between the barrier and the receiver;
urging the receiver away from the barrier as the receiver is moved from the first print line to the second print line to create an integration volume between the first print line, the second print line, the receiver and the barrier within which the co-linear air flow and the cross-module airflow can integrate to allow the co-linear airflow and the cross-module airflow to flow in combination into the lower resistance flow channels without creating flows into the higher resistance flow areas that cause an observable artifact in a print made by the printheads on the receiver.
2. The method of claim 1 , wherein the receiver is urged into contact with at least one interline support surface is positioned to guide the receiver as the receiver is moved from the first print line to the second print line between the first print line and the second print line.
3. The method of claim 2 , wherein the at least one interline support surface comprises at least one of a belt, a guide, a rail, or a turn bar.
4. The method of claim 2 , wherein a frame positions the at least one interline support surface relative to the first print line and the second print line.
5. The method of claim 2 , wherein the urging is created by an air pressure that moves the receiver against the at least one support surface.
6. The method of claim 2 , wherein the urging is created by an air pressure that comprises a vacuum suction that draws the receiver against the at least one interline support surface.
7. The method of claim 6 , further wherein the vacuum suction is provided by a vacuum manifold having seals and that are disposed about the at least one interline support surface, so that a generally sealed area is created between receiver, the at least one interline support surface, the seals and a vacuum system that is operated to create a vacuum in the vacuum manifold that draws the receiver into contact with the at least one interline support surface.
8. The method of claim 2 , wherein the receiver is urged into contact with the at least one support surfaceby inducing an electrostatic charge on the receiver and an opposite electrostatic charge on at least one of the at least one interline support surface so as to create an electrostatic attraction.
9. The method of claim 1 , wherein the receiver is moved so that the receiver is at a first print line distance from the barrier at the first print line, so that the receiver is at a second print line distance from the barrier at the second print line and so that the receiver is urged to a far distance from the barrier that is greater than the first print line distance and the second print line distance as the receiver is moved between the first print line and the second print line.
10. The method of claim 9 , wherein the receiver is urged against the at least one interline support surface by inducing a running buckle in the receiver between the first print line and the second print line.
11. The method of claim 9 , wherein the far distance is at least 30 percent greater than the first print line distance and the second print line distance.
12. The method of claim 9 , wherein the far distance is between 25 to 100 percent greater than the first print line distance and the second print line distance.
13. The method of claim 9 , wherein the far distance is between about 35 to 40 percent greater than the first print line distance and the second print line distance.
14. The method of claim 1 , wherein the cross module airflow flowing through the lower resistance flow channels draws co-linear airflow from the integration area into the cross module flow path.
15. The method of claim 1 , wherein the air in the integration area has a higher pressure than the air in the cross-module flow path but a lower pressure than that required to create flows in one of the higher resistance flow areas that can cause an artifact in a print.
16. A method for operating a printer comprising:
moving a receiver along a direction of receiver movement past a first print line that is not parallel to the direction of receiver movement and a second print line that is not parallel to the direction of receiver movement with at least three inkjet nozzles arranged along the first print line and the second print line and with a plurality of caps each cap being positioned about one of the at least three inkjet printing nozzles and extending from a barrier toward the receiver to create a higher resistance flow area between the cap and the receiver within which an opening is positioned and with the plurality of caps being separated to create lower resistance flow channels between the caps;
causing the inkjet nozzles to direct inkjet droplets through the openings in the caps in the higher resistance flow areas and onto the receiver;
supplying a flow of a co-linear airflow through the openings in the caps toward the receiver;
supplying a cross-module airflow between the bather and the receiver;
wherein the receiver is urged away from the barrier as the receiver is moved from the first print line to the second print line to create an integration volume between the first print line, the second print line, the receiver and the barrier within which co-linear air flow and cross-module airflow can integrate to allow the co-linear airflow and the cross-module airflow to flow in combination into lower resistance flow channels provided in separations between the caps without creating flows into the higher resistance flow areas that cause an observable artifact in a print made using the printing module.