Laser-Sensitive Protective Coating for Composite Paint Removal
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Solution Overview
Problem
Current methods for removing outer coatings from non-metallic composite parts, such as chemical paint strippers and mechanical abrasion, can damage the underlying composite material and are inefficient, requiring multiple applications and special containment.
Innovation Solution
Applying a protective coating layer with a multilayer structure or co-curable coating containing laser-sensitive materials, such as reflective or optical sensor materials, to the non-metallic composite part, allowing for laser ablative removal of the outer coating while minimizing damage to the composite material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical paint stripper is used to remove outer livery, then the outer livery can be removed, but the composite part may be damaged and multiple applications are required
Solution Approach 1:
The coating system is segmented into distinct layers: a base coating layer applied to the composite part, and a laser-sensitive layer applied over the base coating. This segmentation allows the laser-sensitive layer to be selectively removed by laser ablation without affecting the underlying base coating and composite part, thereby improving paint removal efficiency while preventing damage to the composite structure.
Solution Approach 2:
The base coating layer serves as an intermediary protective layer between the composite part and the laser-sensitive outer layer. During laser ablation, this intermediary layer absorbs the laser energy and facilitates selective removal of the outer livery while protecting the composite part from direct laser exposure and potential thermal damage.
2Productivity
If mechanical abrasion (sanding) is used to remove outer livery, then the outer livery can be removed, but the process is time consuming and may damage the composite surface
Solution Approach 1:
The invention replaces the mechanical abrasion system (sanding) with a laser-based ablation system. The laser-sensitive layer is designed to undergo controlled decomposition and removal when exposed to laser radiation, enabling rapid paint removal without mechanical contact. This substitution dramatically reduces processing time and eliminates surface damage associated with sanding while maintaining effective livery removal capability.
3Ease of operation
If chemical paint stripper is used, then outer livery removal is achieved, but special containment and multiple applications are required
Solution Approach 1:
The invention replaces chemical-based removal processes with laser-based ablation. The laser-sensitive layer contains materials that decompose under laser irradiation, enabling clean removal without chemical strippers. This eliminates the need for special containment equipment and multiple chemical applications, simplifying the overall operation while reducing environmental and safety concerns associated with chemical handling.
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 method effectively removes outer coatings without damaging the composite part, reducing the need for multiple applications and special containment, and allows for precise control of the laser ablation process through feedback loops, ensuring efficient and safe removal.
Implementation Method 1
enabling removal of said coatings from a composite substrate by laser ablation
Implementation Method 2
the laser-sensitive layer is configured to undergo decomposition upon exposure to laser radiation
Implementation Method 3
the laser-sensitive layer is selected from a reflective layer, an optical sensor layer or a layer having both reflective and optical sensor properties
Data Source
Figure 1A~1E
Figure 2
Figure 3
AI summary
Disclosed are methods and coatings for protecting the surface of a non-metallic composite part (200), comprising applying a protective layer (300) to an exposed surface of the non-metallic composite part (200), the protective layer comprising: (a) a multilayer (310) having at least a co-cured layer (312) applied to the surface of the non-metallic part (200) and laser-sensitive layer (311) applied to a surface of the co-cured layer (312), wherein the laser-sensitive layer (311) is selected from a reflective layer, an optical sensor layer or a layer having both reflective and optical sensor properties; or (b) a co-cured coating which comprises a laser-sensitive material (320a) incorporated therein to form a laser-sensitive co-cured layer (320) applied to a surface of the non-metallic composite part (200), wherein the laser-sensitive material (320a) is selected from a reflective material, an optical sensor material or a combination thereof, such that the non-metallic composite part (200) will be protected from damage during subsequent laser ablation to remove an outer coating (500).