Decorative Sheet UV Absorbent Layer Design for Stretching Cracking
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Solution Overview
Problem
Decorative sheets attached to formed products face challenges in achieving sufficient weather resistance due to reduced thickness when stretched, leading to inadequate UV ray absorption and potential cracking, especially when the acrylic resin layer with UV absorbent material is stretched.
Innovation Solution
A decorative sheet design with a base member, a protective layer, and a coloring layer, both containing UV absorbent material, where the protective layer has a thickness of 30 μm to 60 μm and 1.4 wt % to 4.0 wt % UV absorbent, and the coloring layer has a thickness of 15 μm to 80 μm and 1.0 wt % to 4.0 wt % UV absorbent, ensuring high weather resistance and preventing cracking during stretching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the decorative sheet is stretched to fit the rugged surface of the formed product, then the decorative sheet can be properly attached, but the thickness of the sheet is reduced leading to insufficient UV ray absorption
Solution Approach 1:
The patent applies local quality by concentrating UV absorbent material in specific layers (protective layer and coloring layer) rather than uniformly distributing it throughout the entire decorative sheet. This ensures that UV protection is localized where it is most needed - at the surfaces exposed to sunlight - while maintaining flexibility for stretching.
Solution Approach 2:
The patent uses composite materials by combining multiple layers with different functions: a base member for structural support, a protective layer with UV absorbent material for weather resistance, and a coloring layer with UV absorbent material for color protection. This multi-layer composite structure allows each layer to perform its specific function while working together to solve the contradiction between stretching and UV protection.
2Object-affected harmful factors
If the acrylic resin layer with UV absorbent material is thickened to improve weather resistance, then UV ray absorption increases, but the sheet becomes difficult to stretch and may crack
Solution Approach 1:
The patent segments the UV protection function into two separate layers: a protective layer containing UV absorbent material and a coloring layer containing UV absorbent material. This segmentation allows each layer to be optimized independently - the protective layer provides UV protection without needing to be excessively thick, and the coloring layer provides both color and additional UV protection, while the overall structure remains stretchable.
Solution Approach 2:
The patent applies parameter changes by optimizing the thickness and UV absorbent material content of each layer within specific ranges. The protective layer is maintained at 30-60 μm with 1.4-4.0 wt% UV absorbent material, and the coloring layer at 15-80 μm with 1.0-4.0 wt% UV absorbent material. These parameter optimizations ensure sufficient UV protection while maintaining the flexibility needed for stretching without cracking.
3Object-affected harmful factors
If the overall decorative sheet is thickened in advance to compensate for stretching, then UV ray absorption is improved, but cost increases significantly
Solution Approach 1:
The patent applies local quality by placing UV absorbent material only in the protective layer and coloring layer where it is most effective for UV protection, rather than thickening the entire sheet including the base member. This localized approach provides sufficient UV absorption while minimizing material consumption and cost increase.
Solution Approach 2:
The patent uses a standardized multi-layer structure with optimized parameters that can be replicated across different decorative sheet applications. By establishing a proven configuration (protective layer with UV absorbent material and coloring layer with UV absorbent material within specific thickness and concentration ranges), the solution can be copied and applied consistently without requiring excessive material or significant cost increases.
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 solution provides enhanced weather resistance and prevents cracking of the decorative sheet when attached to a formed product, maintaining color integrity and gloss even under prolonged sunlight exposure.
Implementation Method 1
the UV absorbent material included in the acrylic resin layer 212 absorbs UV rays
Data Source
AI summary
A decorative sheet that may be attached to a surface of an object includes a base member, which has first and second opposed principal surfaces; a protective layer, which is arranged over the first principal surface of the base member; and a coloring layer, which is arranged either over the second principal surface of the base member or between the base member and the protective layer and which includes a pigment. The protective layer has a thickness of about 30 μm to about 60 μm and includes about 1.4 wt % to about 4.0 wt % of UV absorbent material. The coloring layer has a thickness of about 15 μm to about 80 μm and includes about 1.0 wt % to about 4.0 wt % of UV absorbent material.