Inkjet Primer Nebulizer to Avoid Roller Bulk and Printhead Failure
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Solution Overview
Problem
Inkjet printers face challenges in applying primers to media without using rollers or printheads, which can lead to contamination, complexity, and printhead failure due to primer satellites.
Innovation Solution
A color inkjet printer with a nebulizer and pressure source applies a primer mist directly onto media before the print zone, using a piezoelectric transducer to generate the mist and direct it towards the media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a roller method is used to apply primer to media, then the system is simpler to implement, but the system becomes bulky and primer can be contaminated with debris and ink
Solution Approach 1:
The patent replaces the mechanical roller-based primer application system with an acoustic field-based nebulizer system. The nebulizer uses ultrasonic vibration to generate primer mist without mechanical contact with media, eliminating the bulky roller mechanism while maintaining primer application capability. This substitution resolves the contradiction by achieving simplicity without bulkiness.
Solution Approach 2:
The patent employs a fluid delivery system that uses gas flow to transport and deposit primer mist onto media. This pneumatic approach replaces the mechanical roller contact method, reducing system bulk while enabling precise primer application. The gas flow carries primer particles through the air gap to the media surface without requiring large mechanical components.
2Productivity
If a printhead method is used to apply primer, then coating efficiency is improved, but cost and complexity increase and printhead failure may occur due to primer satellites
Solution Approach 1:
The patent replaces the printhead mechanical ejection system with an acoustic nebulization system. The ultrasonic transducer generates primer mist through vibration rather than mechanical ejection, eliminating the risk of primer satellites that cause printhead failure. This substitution maintains high coating efficiency while reducing system complexity and cost.
Solution Approach 2:
The patent uses ultrasonic vibration of the transducer to generate primer mist. This vibrational mechanism replaces the mechanical ejection process of printheads, achieving efficient primer deposition without creating satellite droplets that lead to printhead clogging and failure. The vibration-based approach maintains productivity while eliminating the associated risks.
3Reliability
If primer is applied using a receptacle and supply roller, then primer application is achieved, but the system is bulky and primer can be contaminated during duplex printing
Solution Approach 1:
The patent replaces the mechanical roller contact system with a non-contact acoustic nebulization system. The ultrasonic transducer generates primer mist that is delivered through gas flow without mechanical contact with media or receptacles, eliminating contamination from debris and ink during duplex printing while maintaining reliable primer application.
Solution Approach 2:
The patent introduces gas flow as an intermediary medium to transport primer particles from the nebulizer to the media surface. This gaseous intermediary replaces the mechanical roller contact, preventing primer contamination from media debris and ink while maintaining effective primer application. The gas carrier protects the primer from direct contact with contaminated surfaces.
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 method improves print quality on both coated and uncoated paper by preventing ink absorption into the media, reduces system complexity, and avoids printhead failures.
Implementation Method 1
A piezoelectric transducer in the nebulizer generates the mist
Implementation Method 2
A piezoelectric transducer in the nebulizer generates the mist
Implementation Method 3
a source of gas flow to direct the generated mist toward media on the media transport
Data Source
AI summary
An inkjet printer includes a nebulizer to generate a mist of primer and direct the mist onto media passing the nebulizer before the media is printed. A piezoelectric transducer is immersed in a primer solution and provided an alternating current to produce the mist. A pressure source directs the mist toward the passing media to apply the primer to the media.