Superoleophobic Glass Printhead Coating for Ink Repellency
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Solution Overview
Problem
Fluid ink jet systems face issues with wetting, drooling, and flooding of inks on the printhead front face, leading to contamination, nozzle blocking, and degraded print quality, which current coatings fail to adequately address, especially with UV and solid inks.
Innovation Solution
A superoleophobic device with a textured surface formed by glass pillars or stripe-shaped structures on a glass substrate, coated with a conformal oleophobic layer to create a surface that repels oils and is easy to clean, reducing ink adhesion and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current sputtered PTFE coatings are used on printhead front faces, then the coating provides some oleophobic properties, but UV and solid inks still adhere and flow along the surface causing contamination at jetting temperatures between 75-105°C
Solution Approach 1:
The patent changes the surface energy parameters of the printhead front face by applying a fluorinated oleophobic coating that maintains extremely low surface energy even at elevated temperatures (75-105°C), preventing ink adhesion where conventional PTFE coatings fail
Solution Approach 2:
The patent uses a composite approach combining a fluorinated polymer material with specific chemical structure (containing CF3 groups) to create a coating that exhibits superior oleophobic properties compared to conventional PTFE, achieving resistance to both UV and solid inks simultaneously
2Ease of operation
If printhead front face is cleaned with a maintenance unit, then contamination is removed, but system complexity, hardware cost, and reliability issues are introduced
Solution Approach 1:
The fluorinated oleophobic coating enables the printhead surface to be self-cleaning by causing ink droplets to bead up and roll off without adhesion, eliminating the need for complex maintenance units and manual cleaning procedures
3Reliability
If conventional PTFE coatings are used, then the coating provides oleophobic properties, but the coating is not robust enough to withstand maintenance procedures such as wiping
Solution Approach 1:
The patent employs a fluorinated polymer coating that combines the low surface energy properties of PTFE with enhanced mechanical durability, creating a composite material that is both oleophobic and robust enough to withstand wiping and maintenance procedures
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
The superoleophobic surface effectively prevents ink contamination, allowing ink droplets to roll off without residue, improving print quality and reducing maintenance complexity, with enhanced drool pressure and ease of cleaning.
Implementation Method 1
A conformal oleophobic coating can be disposed on portions of the glass substrate, the patterned layer, and the plurality of glass structures to form a textured superoleophobic surface
Data Source
AI summary
Various embodiments provide materials and methods for a superoleophobic device, which can include a conformal oleophobic coating disposed on glass pillars and/or stripe-shaped glass structures on a glass substrate to provide the device with a textured superoleophobic surface.