Laser-Structured Plastic Surface Treatment for 3D-MID Metallization
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Solution Overview
Problem
Laser structuring of 3D-MIDs results in unintentional removal and deposition of metal seeds on the substrate surface, leading to short-circuiting issues during metallization, which can be mitigated by increasing circuit path distances but results in reduced circuit density.
Innovation Solution
A method involving a process solution with wetting agents and cleaners, such as alkaline, acidic, or neutral compositions, is used to remove unintentionally deposited metal seeds from the substrate surface without damaging the existing circuit paths, including the use of ultrasound for enhanced cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If laser structuring is performed to generate metal seeds on the substrate surface, then circuit paths can be formed for 3D-MID applications, but unintentional removal and deposition of metal seeds occurs leading to short-circuiting issues
Solution Approach 1:
A chemical treatment step is introduced before metallization to remove unintentionally deposited metal seeds from the substrate surface. This preliminary cleaning action eliminates harmful deposits that would otherwise cause short-circuits, while preserving the intentionally structured circuit paths through selective removal based on morphological differences.
2Reliability
If distances between circuit paths are increased to avoid short-circuiting from deposited metal seeds, then reliability improves, but circuit density decreases
Solution Approach 1:
The harmful unintentional metal seed deposits are extracted and removed from the substrate surface through chemical treatment. This extraction eliminates the need to increase spacing between circuit paths, as the problematic deposits are directly removed rather than avoided through layout adjustments.
3Reliability
If chemical treatment is applied to remove unintentional metal seed deposits, then circuit path selectivity improves, but the structured circuit paths must be protected from damage
Solution Approach 1:
The chemical treatment exhibits local quality by differentiating between intentionally structured circuit paths and unintentional deposits. The treatment parameters (chemistry, temperature, time) are optimized to selectively remove loosely bound unintentional deposits while preserving the firmly attached metal seeds in the structured circuit paths through their distinct morphological and chemical properties.
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
Effectively removes unintentional metal seed deposits without harming the structured circuit paths, maintaining circuit integrity and preventing short-circuiting while allowing for higher circuit densities.
Implementation Method 1
contacting the plastic substrate with a process solution suitable for removal of unintentional metal seed deposits that form during laser structuring
Implementation Method 2
including the use of ultrasound for enhanced cleaning
Data Source
AI summary
The present invention relates to a method for treating plastic substrates structured by means of a laser or generation of seed structures on the surface that are suitable for subsequent metallization. The substrates, after the laser structuring, are brought into contact with a process solution that is suitable for removal of the unintentional deposits that arise during the laser structuring. The treatment of the laser-structured substrates with a mixture of wetting agents and compositions that support the cleaning before metallization leads to sufficient removal of the unintentionally deposited metal seeds, without having a lasting damaging effect on the planned structured surface paths.