Decorative Sheet Shape Retention Layer for Forming
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Solution Overview
Problem
Decorative sheets used in vehicles and buildings are cumbersome to attach due to their flat sheet shape, requiring stretching and heating, which can lead to deformation or damage, reducing processability and workability.
Innovation Solution
A decorative sheet with a release layer, a pressure-sensitive adhesive layer, and a skin layer, where the release layer includes a shape retention layer made from acrylonitrile-butadiene-styrene copolymer with a specific thickness and softening temperature range, and an easy release layer, enhancing shape retention and peelability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the decorative sheet is heated and stretched to conform to the adherend shape, then the workability during mounting is improved, but the sheet may be deformed in unwanted shape or damaged, resulting in decreased processability
Solution Approach 1:
The release layer is divided into two functional segments: a shape retention layer (100-700 μm thick) that maintains structural integrity during heating and forming, and an easy release layer that enables subsequent peeling. This segmentation allows the sheet to be heated and formed without deformation while maintaining reliability.
Solution Approach 2:
The decorative sheet uses a composite structure combining the shape retention layer (made from heat-resistant material), the easy release layer, and the skin layer with pressure-sensitive adhesive. This composite material approach enables the sheet to withstand heating temperatures without deforming while allowing easy mounting afterward.
2Ease of manufacture
If the decorative sheet is formed in a flat sheet shape, then the manufacturing is simplified, but the attaching operation becomes cumbersome requiring stretching and heating
Solution Approach 1:
The shape retention layer is prepared in advance with sufficient thickness (100-700 μm) to maintain structural integrity during subsequent heating and stretching operations. This preliminary preparation enables the sheet to be easily manufactured in flat form while still allowing easy attaching operations later without deformation.
3Loss of substance
If the shape retention layer is made thinner to reduce material usage, then the cost is reduced, but the sheet becomes more prone to deformation and damage during forming
Solution Approach 1:
The shape retention layer thickness is optimized to a specific range (100-700 μm) that provides sufficient structural support to prevent deformation during heating and forming, while avoiding excessive material usage. This parameter optimization achieves both cost reduction and maintained reliability.
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 decorative sheet achieves excellent processability and workability by preventing unwanted deformation and damage during forming and mounting, allowing for efficient three-dimensional processing and improved mounting efficiency.
Implementation Method 1
The shape retention layer is a resin sheet made from an acrylonitrile-butadiene-styrene copolymer. The shape retention layer has a thickness of not less than 100 μm and not more than 700 μm, and has a softening start temperature of not less than 80° C. and not more than 150° C.
Implementation Method 2
the shape retention layer has a softening start temperature of not less than 80° C. and not more than 150° C.
Implementation Method 3
a pressure-sensitive adhesive layer disposed on a surface of the release layer
Implementation Method 4
an easy release layer interposed between the pressure-sensitive adhesive layer and the shape retention layer
Data Source
AI summary
Provided are a decorative sheet which has excellent processability and with which an increase in workability during mounting can be achieved, a formed sheet obtained by forming the decorative sheet, and a formed sheet manufacturing method. The decorative sheet 1 is provided with a release layer 2, a pressure-sensitive adhesive layer 3 disposed on a surface of the release layer 2, and a skin layer 4 disposed on a surface of the pressure-sensitive adhesive layer 3. The release layer 2 includes a shape retention layer 5 and an easy release layer 6 interposed between the pressure-sensitive adhesive layer 3 and the shape retention layer 5. The shape retention layer 5 is a resin sheet made from an acrylonitrile-butadiene-styrene copolymer. The shape retention layer 5 has a thickness of not less than 100 μm and not more than 700 μm.