Etch Resist Inkjet Printing on Activated Copper Surfaces
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Solution Overview
Problem
Conventional inkjet printing of etch-resist masks on copper surfaces for printed circuit board manufacturing results in poor print quality due to uncontrolled spreading and clustering of ink drops, leading to issues like inconsistent line width, poor edge smoothness, and shorts between lines.
Innovation Solution
A method involving the application of a chemically surface-activating solution to the copper surface, followed by inkjet printing of an etch-resist ink that undergoes a chemical reaction with the activated surface to immobilize ink droplets, thereby improving print quality and line precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional inkjet printing is used to apply etch-resist mask on copper surface, then the manufacturing process is simpler and faster, but the print quality deteriorates due to uncontrolled spreading and clustering of ink drops
Solution Approach 1:
The copper surface is pre-treated with a chemically surface-activating solution before inkjet printing to modify its surface properties. This preliminary action creates a surface that prevents uncontrolled ink spreading while maintaining the benefits of inkjet printing speed and simplicity
Solution Approach 2:
The chemical state of the copper surface is changed through activation treatment, transforming it from a non-absorbing surface to an activated surface that controls ink droplet behavior. This parameter change in surface chemistry enables precise line width control without sacrificing manufacturing efficiency
2Ease of manufacture
If conventional inkjet printing is used on copper surface, then the process is more cost-effective, but the line edge smoothness and pattern quality deteriorate
Solution Approach 1:
Surface activation is performed as a preliminary step before inkjet printing to prepare the copper surface. This low-cost pre-treatment enables high-quality print output while maintaining the cost-effectiveness of inkjet printing technology
Solution Approach 2:
The chemically activating solution acts as an intermediary between the inkjet printed ink and the copper surface. It mediates the interaction by creating an activated surface layer that enables controlled ink deposition and sharp line edges without requiring expensive alternative printing methods
3Device complexity
If inkjet printing is used without surface activation, then the process is simpler, but shorts between adjacent lines and disconnection of pattern lines occur
Solution Approach 1:
Surface activation is implemented as a necessary preliminary step to ensure reliable pattern formation. This simple pre-treatment prevents defects such as shorts and disconnections, improving pattern reliability without significantly increasing process complexity
Solution Approach 2:
The surface properties of copper are chemically modified through activation, changing parameters such as surface energy and reactivity. This enables the ink to form continuous, well-defined lines without defects, significantly improving pattern connectivity and reliability
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 proposed method achieves high print quality with well-defined, thin lines (down to 50 microns) and sharp edges, significantly reducing issues like shorts and disconnections, thereby enhancing the manufacturing of printed circuit boards.
Implementation Method 1
applying onto a metallic surface coupled to the substrate, a chemically surface-activating solution having an activating agent that chemically activates the metallic surface
Implementation Method 2
at least one ink component within the etch-resist ink undergoes a chemical reaction with the activated metallic surface to immobilize droplets of the etch-resist ink when hitting the activated surface
Data Source
AI summary
A method of forming a metallic pattern on a substrate is provided. The method includes applying onto a metallic surface, a chemically surface-activating solution having an activating agent that chemically activates the metallic surface; non-impact printing an etch-resist ink on the activated surface to produce an etch resist mask according to a predetermined pattern, wherein at least one ink component within the etch-resist ink undergoes a chemical reaction with the activated metallic surface to immobilize droplets of the etch-resist ink when hitting the activated surface; performing an etching process to remove unmasked metallic portions that are not covered with the etch resist mask; and removing the etch-resist mask.