Laser Coating Removal for Building Material Sealing Adhesion
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Solution Overview
Problem
In building materials, the sealing applied between adjacent boards often peels away due to unwanted coating films on the side surfaces, leading to water infiltration and deterioration of physical properties, as the coating on the front surface tends to spread and form unwanted films on the sides during application processes like spraying or flow coating.
Innovation Solution
A method where laser irradiation is used to remove or reduce the coating film on the side surfaces of building materials, ensuring a sufficient width of the laser-irradiated area to prevent peeling of the sealing, while maintaining the design characteristics of the front surface, typically using an output between 1.8 and 30 watts to achieve effective adhesion without damaging the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coating is applied to the front surface of building material, then weatherability and appearance are improved, but coating film spreads to side surface forming unwanted coating that causes sealing peeling
Solution Approach 1:
The patent removes the harmful coating film from the side surface through laser irradiation, extracting only the unwanted coating while preserving the front surface coating. This resolves the contradiction by eliminating the sealing peeling cause without affecting the front surface weatherability and appearance protection.
Solution Approach 2:
The patent applies different surface treatments to different locations: the front surface maintains its coating for weatherability and appearance, while the side surface has its coating removed via laser irradiation to prevent sealing peeling. This local differentiation resolves the contradiction by optimizing each surface for its specific function.
2Reliability
If coating is applied to side surface to prevent sealing peeling, then sealing adhesion is improved, but unwanted coating film forms on side surface
Solution Approach 1:
The patent extracts the coating film from the side surface using laser irradiation, removing the harmful element that causes sealing peeling while avoiding the need to apply additional coating that would mar the side surface appearance.
Solution Approach 2:
Instead of applying coating to the side surface to improve sealing adhesion (which creates unwanted films), the patent inverts the approach by removing the coating film through laser irradiation, achieving sealing adhesion without compromising side surface appearance.
3Manufacturing precision
If laser output is increased beyond 30 watts, then coating film removal is more effective, but remarkable effect is not provided and energy waste occurs
Solution Approach 1:
The patent optimizes the laser output parameter to a specific range (1.8-30 watts) that achieves sufficient coating film removal effectiveness. This parameter optimization resolves the contradiction by finding the sweet spot where adequate coating removal is achieved without excessive energy consumption.
4Loss of energy
If laser output is decreased below 1.8 watts, then energy consumption is reduced, but coating film cannot be removed or reduced sufficiently
Solution Approach 1:
The patent establishes a minimum laser output threshold (1.8 watts) that ensures sufficient coating film removal effectiveness. This parameter setting resolves the contradiction by defining the lowest effective energy level that still achieves the required coating removal, avoiding both under-treatment and excessive energy waste.
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 ensures that the sealing adheres well to the building material, preventing peeling and water infiltration, while maintaining the appearance and design of the front surface, thus enhancing the durability and productivity of the building material.
Implementation Method 1
a coating film has been removed or reduced by laser irradiation
Data Source
AI summary
The present invention provides a building material in which a coating is applied to a front surface and a side surface is sufficiently adhered to a sealing and method for manufacturing thereof. In a building material in which a coating is applied to a front surface, a coating film on a side surface is removed or reduced by laser irradiation. The part of the side surface in which the coating film has been removed or reduced by laser irradiation has a width of at least 5 mm from a front surface side toward a rear surface side of the building material, or extends over the entire side surface from the front surface side toward the rear surface side of the building material, or is formed more than a part in which coating film is formed.