Nozzle Plate Chrome Density Film Adhesion
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Solution Overview
Problem
Conventional nozzle plates face issues with the peeling off of water-repellent films during maintenance, leading to unstable liquid discharge and increased production costs due to the complexity of film layers required for adhesion.
Innovation Solution
A nozzle plate with a stainless steel base having a surface layer with a higher chrome density than the base, where the water-repellent film is directly formed, enhancing adhesion without additional production processes through polishing and etching with specific agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple film layers (SiO2 film, chrome layer, siloxane-containing polyimide layer) are provided to improve adhesion between the water-repellent film and the nozzle base, then the adhesion is improved, but the production cost rises due to the increased number of production processes
Solution Approach 1:
The invention extracts and eliminates the intermediate film layers (SiO2 film, chrome layer, siloxane-containing polyimide layer) from the multi-layer structure. By directly forming the water-repellent film on the nozzle base surface through polishing and etching processes, it achieves adhesion without requiring multiple intermediate layers, thus reducing production process complexity while maintaining reliability
Solution Approach 2:
The invention performs preliminary surface treatment (polishing and etching) on the nozzle base before forming the water-repellent film. This preliminary action modifies the surface properties to enhance adhesion directly, eliminating the need for subsequent intermediate film deposition processes and reducing overall production complexity
2Reliability
If a water-repellent film is provided on the nozzle base to stabilize liquid discharge, then liquid discharge stability is improved, but the film peels off during maintenance wiping
Solution Approach 1:
The invention performs preliminary polishing and etching treatments on the nozzle base surface before applying the water-repellent film. This creates a surface with enhanced mechanical interlocking capability, allowing the film to withstand wiping forces during maintenance while maintaining its water-repellent properties for stable liquid discharge
Solution Approach 2:
The invention changes the surface parameters of the nozzle base through polishing and etching processes, creating a surface with specific roughness and chemical composition that enhances the water-repellent film's adhesion strength, enabling it to resist peeling during maintenance wiping
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 solution provides improved resistance to wiping and maintains stable liquid discharge trajectories, extending the lifespan of the nozzle plate without degrading the contact angle, even after extensive use.
Implementation Method 1
removing Fe in a surface layer area of the stainless material by etching using a polishing agent
Implementation Method 2
combining chrome with oxygen
Data Source
AI summary
A nozzle plate includes a nozzle base; a nozzle hole to discharge droplets and formed on the nozzle base; and a water-repellent film formed on at least a liquid discharging surface of the nozzle base. The nozzle base is formed of a stainless material that includes a surface layer area on which the water-repellent film is formed. The surface layer area has a higher chrome density than the chrome density of the stainless material itself, and a ratio of Cr to Fe (Cr/Fe) in the surface layer area is equal to and more than 0.8. The nozzle plate production method as such includes polishing with a polishing agent a surface of the nozzle base; removing Fe in a surface layer area of the stainless material by etching using a polishing agent; and combining chrome with oxygen.