DIAGNOSTIC AND DETECTION METHOD FOR INKJET PRINTS USING PAPER PRECOAT SOLUTIONS
A method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application includes passing a diagnostic media in proximity to a first printhead may include a plurality of ejector jets. The method includes firing each of the plurality of jets onto the diagnostic media to deposit a precoat solution onto the diagnostic media in a first predetermined pattern, followed by depositing a plurality of droplets of at least one ink compositions onto the diagnostic media in a second predetermined pattern. An image of the diagnostic sheet can be captured and the printed pattern analyzed to detect missing or misdirected jets of a printhead configured to deposit a precoat solution or a primer solution.
1 . A method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application, comprising:
passing a diagnostic media in proximity to a first printhead comprising a plurality of ejector jets;
firing each of the plurality of ejector jets onto the diagnostic media;
depositing a precoat solution onto the diagnostic media in a first predetermined pattern;
passing the diagnostic media in proximity to at least a second printhead comprising a plurality of ejector jets;
depositing a plurality of droplets of at least one ink compositions onto the diagnostic media in a second predetermined pattern; and
capturing an image of a printed pattern on the diagnostic media.
2 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 1 , further comprising:
analyzing the printed pattern of the captured image; and
comparing the printed pattern of the captured image to the second predetermined pattern.
3 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 1 , further comprising performing a maintenance procedure to correct a primer printhead defect.
4 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 3 , wherein the maintenance procedure to correct a primer printhead defect comprises cleaning a face of the first printhead, performing a maintenance jetting procedure using the first printhead, flushing the first printhead, replacing the first printhead, or a combination thereof.
5 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 1 , wherein the image of the printed pattern on the diagnostic media is captured with a scanner that is inline with respect to a printing process path.
6 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 1 , wherein the diagnostic media further comprises a trigger pattern configured to send a signal to an inline scanner.
7 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 1 , wherein the diagnostic media comprises uncoated paper.
8 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 1 , wherein the first predetermined pattern comprises a plurality of dashes.
9 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 8 , wherein the dashes are parallel lines.
10 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 9 , wherein the parallel lines are from about 2 to about 5 pixels apart from one another.
11 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 8 , wherein the dashes are not parallel lines.
12 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 11 , wherein the dashes are from about 2 to about 20 pixels apart from one another.
13 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 1 , wherein the first predetermined pattern and the second predetermined pattern are the same.
14 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 1 , wherein depositing a plurality of droplets of at least one ink compositions onto the diagnostic media in a second predetermined pattern comprises depositing a plurality of droplets of at least four ink compositions.
15 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 1 , wherein the precoat solution comprises 5% wt to 40% wt of a salt in an aqueous solution based on a total weight of the aqueous solution.
16 . A method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application, comprising:
passing a diagnostic media in proximity to a first printhead comprising a plurality of ejector jets;
firing each of the plurality of ejector jets onto the diagnostic media;
depositing a precoat solution onto the diagnostic media in a first predetermined pattern comprising a plurality of dashes;
passing the diagnostic media in proximity to at least a second printhead comprising a plurality of ejector jets;
depositing a plurality of droplets of at least one ink compositions onto the diagnostic media in a second predetermined pattern comprising a plurality of dashes that is the same as the first predetermined pattern;
capturing an image of a printed pattern on the diagnostic media;
analyzing the printed pattern of the captured image; and
comparing the printed pattern of the captured image to the second predetermined pattern.
17 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 16 , wherein the precoat solution comprises 5% wt to 40% wt of a salt in an aqueous solution based on a total weight of the aqueous solution.
18 . A method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application, comprising:
passing a diagnostic media in proximity to a first printhead comprising a plurality of ejector jets;
firing each of the plurality of ejector jets onto the diagnostic media;
depositing a precoat solution onto the diagnostic media in a first predetermined pattern;
passing the diagnostic media in proximity to at least a second printhead comprising a plurality of ejector jets;
depositing a plurality of droplets of at least four ink compositions onto the diagnostic media in a second predetermined pattern that comprises a composite image; and
capturing an image of a printed pattern on the diagnostic media.
19 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 18 , wherein:
the diagnostic media further comprises a trigger pattern configured to send a signal to an inline scanner; and
the diagnostic media comprises uncoated paper.
20 . The method for detecting missing or misdirected jets in a drop on demand delivery system for media priming in an inkjet printing application of claim 18 , wherein the precoat solution comprises 5% wt to 40% wt of a salt in an aqueous solution based on a total weight of the aqueous solution.