Inkjet Nozzle Hydration via Tailored Keep-Wet Patterns
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Solution Overview
Problem
Inkjet printers face challenges in maintaining nozzle hydration, particularly in Memjet printers, which can lead to clogging and reduced print quality due to dehydration, and existing strategies for maintaining nozzle hydration are either time-consuming or visually intrusive, especially in high-speed web printing.
Innovation Solution
A method of generating print data that includes a keep-wet pattern tailored to each ink plane of the printhead, using parameters like nozzle position, ink type, print speed, and ambient conditions to minimize the visibility and frequency of keep-wet drops, ensuring nozzle hydration without compromising print quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional maintenance cycles (wiping, purging, spitting) are used to maintain nozzle hydration, then nozzle clogging is reduced, but printing time is increased and ink is wasted
Solution Approach 1:
The patent applies preliminary action by printing keep-wet patterns at strategically selected locations (such as corners or edges of the media) before the maintenance cycle begins. This ensures that nozzle hydration is maintained in advance, preventing clogging before it occurs and eliminating the need for time-consuming maintenance interruptions.
Solution Approach 2:
The patent extracts the essential function of maintaining nozzle hydration from the full maintenance cycle (wiping, purging, spitting) and implements it separately through keep-wet patterns. This selective extraction allows hydration maintenance without requiring the complete maintenance intervention, thereby reducing printing time and ink waste.
2Reliability
If keep-wet patterns are printed frequently to maintain nozzle hydration, then nozzle clogging is prevented, but visual impact on print quality increases
Solution Approach 1:
The patent applies local quality by positioning keep-wet patterns at specific locations such as corners, edges, or less visually critical areas of the media. This localized approach maintains nozzle hydration while minimizing the visual impact on the overall print quality, as the keep-wet drops are confined to areas where they are least noticeable.
Solution Approach 2:
The patent uses keep-wet patterns that replicate existing print elements or match the media background in less critical areas. By copying the visual characteristics of surrounding elements, the keep-wet drops become less visually distinct, maintaining their functional purpose while preserving print aesthetics.
3Manufacturing precision
If maintenance interventions are performed to restore nozzle hydration, then print quality is maintained, but ink consumption increases
Solution Approach 1:
The patent performs preliminary hydration maintenance through keep-wet patterns before nozzles become dehydrated and require full maintenance intervention. This preliminary action prevents the need for ink-intensive purging and spitting operations, thereby maintaining print quality while significantly reducing ink consumption.
4Reliability
If between-page spitting is used to maintain nozzle hydration in web printing, then nozzle clogging is reduced, but it is not feasible for continuous media web printing
Solution Approach 1:
The patent extracts the hydration maintenance function from the between-page spitting process and implements it through keep-wet patterns that can be printed on any media type including continuous webs. This extraction allows the same hydration maintenance mechanism to work across different media formats without requiring media-specific interventions.
Solution Approach 2:
The patent creates a universal solution by designing keep-wet patterns that function across all media types (sheet-fed and continuous web). The keep-wet pattern mechanism serves multiple functions: maintaining hydration, preventing clogging, and working with any media format, thereby achieving adaptability across different printing applications.
Data Source
AI summary
A method of printing from a fixed inkjet printhead having a plurality of ink planes. The method includes the steps of: feeding a print medium past the printhead in a media feed direction, the media feed direction defining relative upstream and downstream sides of the printhead; printing an image onto the print medium, the image being defined by image data; and printing a keep-wet pattern onto the print medium from each ink plane of the printhead, the keep-wet pattern being defined by a plurality of dots printed at a frequency sufficient to maintain hydration of each nozzle in the printhead. A first keep-wet pattern from a first ink plane is printed at a higher frequency than a second keep-wet pattern from a second ink plane, the first ink plane being furthest upstream in the printhead.