Inkjet Nozzle Purging on Curved Surfaces Using Margin Print Lines
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Solution Overview
Problem
Inkjet printers face challenges in reliably dispensing ink to nonporous cylindrical surfaces like test tubes due to nozzle clogging, especially when printing small, identical texts, leading to suboptimal printing results and ink waste.
Innovation Solution
A method that cleans and primes inkjet printheads by printing a solid pattern at the margin of the print surface during each row, using UV curable inks and UV LEDs to cure the ink while preheating the surface, ensuring continuous nozzle cleaning and high-quality printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the printer prints only small identical texts on cylindrical surfaces, then the printing task is completed efficiently, but the nozzles become clogged due to lack of continuous ink flow
Solution Approach 1:
The system performs preliminary nozzle cleaning and priming actions before actual printing begins, and continues periodic cleaning during printing operations. This preliminary and ongoing maintenance prevents nozzle clogging before it occurs, ensuring reliable ink flow while maintaining printing efficiency.
Solution Approach 2:
The system maintains continuous useful action by integrating nozzle cleaning patterns into the normal printing process. Instead of stopping printing to clean nozzles, the system continuously alternates between printing text and cleaning patterns, ensuring both printing productivity and nozzle reliability are maintained simultaneously.
2Reliability
If the printer performs frequent nozzle cleaning, then nozzle clogging is prevented, but ink waste increases
Solution Approach 1:
The cleaning patterns are designed with local quality by concentrating ink ejection only at the margin areas of the cylindrical surface where cleaning is needed, rather than across the entire printing surface. This localized approach maintains nozzle reliability while minimizing unnecessary ink consumption in the central printing areas.
Solution Approach 2:
The system applies partial cleaning action by using minimal cleaning patterns at the margins rather than comprehensive full-surface cleaning. This partial action is sufficient to maintain nozzle function while significantly reducing ink waste compared to exhaustive cleaning methods.
3Reliability
If the printer uses margin area for cleaning patterns, then nozzle cleaning is effective, but the usable printing area is reduced
Solution Approach 1:
The system applies local quality by restricting cleaning patterns to the margin areas of the cylindrical surface, leaving the central and most valuable printing areas untouched. This spatial differentiation ensures effective nozzle cleaning while preserving maximum usable printing area for actual content.
Solution Approach 2:
The printing surface is segmented into functional zones: margin areas dedicated to cleaning operations and central areas dedicated to content printing. This segmentation allows simultaneous execution of cleaning and printing tasks in different spatial zones, maintaining nozzle reliability without significantly compromising overall printing capacity.
4Loss of substance
If manual nozzle cleaning is performed, then ink waste is reduced, but labor time and operational complexity increase
Solution Approach 1:
The system implements self-service by automatically performing nozzle cleaning through programmed printing patterns without requiring manual intervention. The printer autonomously executes cleaning sequences, monitors nozzle status, and maintains optimal performance, reducing both operational complexity and ink waste compared to manual cleaning methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach maintains printing quality by continuously purging and cleaning nozzles, reducing manual intervention and ink waste, while achieving precise and efficient printing on curved surfaces.
Implementation Method 1
UV inks typically include an acrylic monomer and/or oligomer, pigments, photo initiators, and other additives. UV inks cure by chemical reaction from the UV light between 200 and 380nm.
Implementation Method 2
The printing unit preheats the printing surface prior to printing through the use of the UV light source
Data Source
AI summary
A method to prime and clear inkjet nozzles on an inkjet printing device for cylindrical surfaces by instructing the printer to dispense ink at the beginning of each print line to form a predetermined solid rectangular line. By doing so, the ink nozzles are cleaned on every row of printing, therefore minimizing any printing issues due to the nozzles not dispensing ink properly because of blockages or similar issues, therefore increasing the quality and fidelity of the print result.