UV Laser Coating Removal for Composite Surfaces
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Solution Overview
Problem
Current laser-based coating removal techniques are ineffective for uniform coating removal, especially on composite materials like fiber-reinforced polymer composites, due to infrared lasers' inability to produce controlled effects in shallow layers and challenges in achieving desired surface roughness and cleanliness.
Innovation Solution
A coating removal apparatus using a UV laser system with a movable scanning head and integrated optics to direct laser pulses uniformly across the surface, measuring surface roughness in real-time and adjusting the process to achieve desired patterns and surface texture, while the UV laser's photoablation effects vaporize material in a controlled manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If infrared laser is used for coating removal, then the laser can penetrate through the coating, but the ability to produce controlled effects in shallow layers is lost
Solution Approach 1:
The patent changes the wavelength parameter of the laser from infrared to ultraviolet range. This parameter change allows the laser energy to be absorbed in the shallow surface layer rather than penetrating through, enabling controlled photoablation effects precisely where needed for coating removal and surface treatment.
Solution Approach 2:
The patent utilizes photoablation, a process where ultraviolet laser energy directly converts material from solid phase to vapor phase through bond breaking. This phase transition occurs in the shallow surface layer, providing precise control over material removal without the penetration issues of infrared lasers.
2Manufacturing precision
If conventional laser scanning is used, then the beam can be directed across the surface, but uniform energy distribution and desired surface roughness are not achieved
Solution Approach 1:
The patent employs pulsed laser operation with specific pulse durations and repetition rates. This periodic action allows controlled heating and ablation cycles that produce uniform surface roughness and consistent coating removal across the entire treated area, avoiding the non-uniformity of continuous scanning methods.
Solution Approach 2:
The patent incorporates real-time monitoring of surface characteristics during laser treatment. This feedback mechanism allows dynamic adjustment of laser parameters to maintain uniform energy distribution and achieve the desired surface roughness profile across the treated area.
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 system achieves uniform and controlled coating removal with precise surface roughness and cleanliness, enhancing adhesive bond strength and coatings adhesion on composite materials by vaporizing contaminants and altering surface chemistry.
Implementation Method 1
the UV laser's photoablation effects vaporize material in a controlled manner
Implementation Method 2
A UV laser system with a movable scanning head and integrated optics to direct laser pulses uniformly across the surface
Data Source
AI summary
A coating removal apparatus removes a coating from a surface. The apparatus has a movable scanning head and scanning optics. The scanning head is movable in one dimension, and the scanning optics adjust in two dimensions to compensate for movement of the scanning head to implement long range scanning with a uniform scanning pattern. Further, a surface roughness is determined by measuring specular and scattered reflections at various angles. For composite surfaces, the apparatus utilizes UV laser radiation and a controlled atmosphere to remove coating and alter the chemical characteristics at the surface.