Flexographic Printing Plate Halftone Edge Control
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Solution Overview
Problem
Flexographic printing methods for forming insulator films often result in protrusions at the edges of printing patterns, leading to cracking, poor electrical connections, and defects in conductor joining due to excessive film thickness, especially around holes and through holes between conductor films.
Innovation Solution
A flexographic printing plate with halftone dots that vary in condition to reduce ink retention volume on the edges of the printing pattern, preventing protrusions by adjusting halftone dot density and distribution, particularly around holes and edges, to ensure even film thickness and smooth edge formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flexographic printing is used to form an insulator film, then productivity is improved and cost is reduced, but protrusions are generated at the edges of the printing pattern causing cracking and peeling
Solution Approach 1:
The printing plate applies different halftone dot conditions to different regions: the edge region uses smaller halftone dots with lower ink retention volume to prevent protrusion, while the inner region uses larger halftone dots with higher ink retention volume to ensure sufficient film thickness. This local differentiation resolves the contradiction between productivity and manufacturing precision.
Solution Approach 2:
The invention changes the halftone dot parameters (size, density, ink retention volume) based on position on the printing plate. By varying these parameters between the edge region and inner region, the film thickness is optimized for each location, preventing cracking while maintaining productivity.
2Reliability
If the film thickness of the insulator film is increased to prevent cracking, then reliability is improved, but protrusions are generated causing peeling and defects
Solution Approach 1:
The printing plate is designed with spatially varying halftone dot conditions: the inner region has higher ink retention to ensure sufficient film thickness for crack resistance, while the edge region has lower ink retention to prevent protrusion-induced peeling. This resolves the contradiction between reliability and edge film thickness control.
3Quantity of substance
If halftone dots with high ink retention volume are used, then film thickness is sufficient for crack prevention, but protrusions are generated at edges causing peeling
Solution Approach 1:
The printing plate applies high ink retention volume halftone dots to the inner region to ensure sufficient film thickness, while applying low ink retention volume halftone dots to the edge region to maintain sharp edges and prevent protrusion. This local differentiation resolves the contradiction between quantity of substance and manufacturing precision.
4Reliability
If the insulator film is formed with through holes for conductor connection, then electrical connectivity is improved, but protrusions around holes cause poor electrical connection
Solution Approach 1:
The printing plate applies different halftone dot conditions around through holes: the inner region maintains higher ink retention for sufficient film thickness, while the edge region around holes uses lower ink retention to prevent protrusion that would cause poor electrical connection. This resolves the contradiction between electrical connectivity and hole edge film thickness control.
Data Source
AI summary
A method of forming an insulator film by flexographic printing is provided with which an insulator film is formed on a printing object by using ink as an insulator film material and a flexographic printing plate with halftone dots convexly formed on a convex portion thereof that defines a printing pattern. A halftone dot condition change region with a condition of the halftone dots varied such that an ink retention volume therein is smaller than that in other region on the convex portion is provided on a part of the convex portion corresponding to an edge of the printing pattern.