External Wall Panel Coating for Corner Edge Weather Resistance
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Solution Overview
Problem
External wall panels with three-dimensional ornamental designs often suffer from cracks, hairline cracks, blowholes, and pinholes near corner edge areas due to stress concentration and inadequate coating thickness, leading to reduced weather resistance and monotonous appearance.
Innovation Solution
A multi-layer coating method involving a base panel with a lower coating layer, a mid-coating layer, a first clear layer containing beads, and a second transparent or semi-transparent clear layer with a thick film portion at the corner edge of convex portions, providing increased friction for bead retention and a glossy appearance, while the second clear layer enhances weather resistance and color contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple clear layer is coated all over the ornamental design surface to improve weather resistance, then weather resistance is improved, but the appearance becomes too glossy all over and looks monotonous
Solution Approach 1:
The patent applies different coating properties to different areas: a clear layer with beads is applied to the joint portion to provide matte appearance and weather resistance, while a clear layer without beads is applied to the convex portion to maintain glossy appearance. This local differentiation resolves the contradiction by allowing weather resistance improvement without compromising aesthetic appearance.
2Manufacturing precision
If coating is applied to the three-dimensional surface to achieve expected thickness in flat areas, then coating thickness is sufficient in convex and concave portions, but coating thickness is reduced in the slope area of corner edge where material runs down
Solution Approach 1:
The patent applies a primer layer before the clear layer to improve adhesion and create a better base for subsequent coating layers. Additionally, the clear layer with beads in the joint portion creates a textured surface that helps maintain coating thickness and prevents material run-off, addressing the coating thickness issue in corner edge areas before the final glossy layer is applied.
3Reliability
If a clear layer containing beads is applied all over the panel to provide matte appearance, then weather resistance is improved and matte appearance is achieved, but the joint portion and ornamentally designed portion look the same and the panel looks monotonous
Solution Approach 1:
The patent selectively applies beads only in the joint portion (concave area) between convex portions, while leaving the convex portions bead-free. This creates a matte appearance in joints and glossy appearance on the ornamental surfaces, maintaining weather resistance while preserving aesthetic differentiation and avoiding monotony.
4Ease of manufacture
If high-pressure press is used for short time to avoid defects, then cost is reduced, but it is not easy to carry out such technique since high-pressure presses are very expensive
Solution Approach 1:
The patent changes the pressing parameters by applying pressure for a longer duration at lower pressure levels, rather than using high pressure for short time. This alternative parameter combination achieves the same defect prevention effect while using more readily available and less expensive pressing equipment, resolving the contradiction between manufacturing ease and device complexity.
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 prevents defects in the corner edge areas by forming a thick, adherent film that increases weather resistance and provides a visually appealing glossy-matte contrast, enhancing the panel's ornamental design and durability.
Implementation Method 1
providing increased friction for bead retention
Implementation Method 2
a second transparent or semi-transparent clear layer with a thick film portion at the corner edge of convex portions
Data Source
AI summary
The present invention relates to an external wall panel which is excellent in ornamental design and weather resistance and a coating method for the external wall panel. An external wall panel of the invention comprises a base panel having a three-dimensional ornamental design surface, a lower coating layer formed on the surface of the base panel, a mid-coating layer formed on the lower coating layer, a first clear layer containing beads formed on the mid-coating layer, and a second clear layer made of a transparent layer or semi-transparent layer formed on the first clear layer wherein the second clear layer has a thick film layer portion in the vicinity of a corner edge of a convex portion of the three-dimensional ornamental design surface.